mirror of
https://github.com/tursodatabase/libsql.git
synced 2024-12-15 20:20:20 +00:00
2871 lines
86 KiB
C
2871 lines
86 KiB
C
/*
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** 2022-08-27
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**
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** The author disclaims copyright to this source code. In place of
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** a legal notice, here is a blessing:
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**
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** May you do good and not evil.
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** May you find forgiveness for yourself and forgive others.
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** May you share freely, never taking more than you give.
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**
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*************************************************************************
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**
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*/
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#include "sqlite3recover.h"
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#include <assert.h>
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#include <string.h>
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#ifndef SQLITE_OMIT_VIRTUALTABLE
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/*
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** Declaration for public API function in file dbdata.c. This may be called
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** with NULL as the final two arguments to register the sqlite_dbptr and
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** sqlite_dbdata virtual tables with a database handle.
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*/
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#ifdef _WIN32
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__declspec(dllexport)
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#endif
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int sqlite3_dbdata_init(sqlite3*, char**, const sqlite3_api_routines*);
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typedef unsigned int u32;
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typedef unsigned char u8;
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typedef sqlite3_int64 i64;
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typedef struct RecoverTable RecoverTable;
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typedef struct RecoverColumn RecoverColumn;
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/*
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** When recovering rows of data that can be associated with table
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** definitions recovered from the sqlite_schema table, each table is
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** represented by an instance of the following object.
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**
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** iRoot:
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** The root page in the original database. Not necessarily (and usually
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** not) the same in the recovered database.
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**
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** zTab:
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** Name of the table.
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**
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** nCol/aCol[]:
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** aCol[] is an array of nCol columns. In the order in which they appear
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** in the table.
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**
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** bIntkey:
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** Set to true for intkey tables, false for WITHOUT ROWID.
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**
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** iRowidBind:
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** Each column in the aCol[] array has associated with it the index of
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** the bind parameter its values will be bound to in the INSERT statement
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** used to construct the output database. If the table does has a rowid
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** but not an INTEGER PRIMARY KEY column, then iRowidBind contains the
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** index of the bind paramater to which the rowid value should be bound.
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** Otherwise, it contains -1. If the table does contain an INTEGER PRIMARY
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** KEY column, then the rowid value should be bound to the index associated
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** with the column.
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**
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** pNext:
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** All RecoverTable objects used by the recovery operation are allocated
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** and populated as part of creating the recovered database schema in
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** the output database, before any non-schema data are recovered. They
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** are then stored in a singly-linked list linked by this variable beginning
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** at sqlite3_recover.pTblList.
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*/
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struct RecoverTable {
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u32 iRoot; /* Root page in original database */
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char *zTab; /* Name of table */
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int nCol; /* Number of columns in table */
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RecoverColumn *aCol; /* Array of columns */
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int bIntkey; /* True for intkey, false for without rowid */
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int iRowidBind; /* If >0, bind rowid to INSERT here */
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RecoverTable *pNext;
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};
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/*
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** Each database column is represented by an instance of the following object
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** stored in the RecoverTable.aCol[] array of the associated table.
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**
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** iField:
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** The index of the associated field within database records. Or -1 if
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** there is no associated field (e.g. for virtual generated columns).
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**
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** iBind:
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** The bind index of the INSERT statement to bind this columns values
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** to. Or 0 if there is no such index (iff (iField<0)).
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**
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** bIPK:
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** True if this is the INTEGER PRIMARY KEY column.
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**
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** zCol:
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** Name of column.
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**
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** eHidden:
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** A RECOVER_EHIDDEN_* constant value (see below for interpretation of each).
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*/
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struct RecoverColumn {
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int iField; /* Field in record on disk */
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int iBind; /* Binding to use in INSERT */
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int bIPK; /* True for IPK column */
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char *zCol;
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int eHidden;
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};
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#define RECOVER_EHIDDEN_NONE 0 /* Normal database column */
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#define RECOVER_EHIDDEN_HIDDEN 1 /* Column is __HIDDEN__ */
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#define RECOVER_EHIDDEN_VIRTUAL 2 /* Virtual generated column */
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#define RECOVER_EHIDDEN_STORED 3 /* Stored generated column */
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/*
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** Bitmap object used to track pages in the input database. Allocated
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** and manipulated only by the following functions:
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**
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** recoverBitmapAlloc()
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** recoverBitmapFree()
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** recoverBitmapSet()
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** recoverBitmapQuery()
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**
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** nPg:
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** Largest page number that may be stored in the bitmap. The range
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** of valid keys is 1 to nPg, inclusive.
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**
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** aElem[]:
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** Array large enough to contain a bit for each key. For key value
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** iKey, the associated bit is the bit (iKey%32) of aElem[iKey/32].
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** In other words, the following is true if bit iKey is set, or
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** false if it is clear:
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**
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** (aElem[iKey/32] & (1 << (iKey%32))) ? 1 : 0
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*/
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typedef struct RecoverBitmap RecoverBitmap;
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struct RecoverBitmap {
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i64 nPg; /* Size of bitmap */
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u32 aElem[1]; /* Array of 32-bit bitmasks */
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};
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/*
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** State variables (part of the sqlite3_recover structure) used while
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** recovering data for tables identified in the recovered schema (state
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** RECOVER_STATE_WRITING).
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*/
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typedef struct RecoverStateW1 RecoverStateW1;
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struct RecoverStateW1 {
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sqlite3_stmt *pTbls;
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sqlite3_stmt *pSel;
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sqlite3_stmt *pInsert;
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int nInsert;
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RecoverTable *pTab; /* Table currently being written */
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int nMax; /* Max column count in any schema table */
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sqlite3_value **apVal; /* Array of nMax values */
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int nVal; /* Number of valid entries in apVal[] */
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int bHaveRowid;
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i64 iRowid;
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i64 iPrevPage;
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int iPrevCell;
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};
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/*
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** State variables (part of the sqlite3_recover structure) used while
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** recovering data destined for the lost and found table (states
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** RECOVER_STATE_LOSTANDFOUND[123]).
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*/
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typedef struct RecoverStateLAF RecoverStateLAF;
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struct RecoverStateLAF {
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RecoverBitmap *pUsed;
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i64 nPg; /* Size of db in pages */
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sqlite3_stmt *pAllAndParent;
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sqlite3_stmt *pMapInsert;
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sqlite3_stmt *pMaxField;
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sqlite3_stmt *pUsedPages;
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sqlite3_stmt *pFindRoot;
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sqlite3_stmt *pInsert; /* INSERT INTO lost_and_found ... */
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sqlite3_stmt *pAllPage;
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sqlite3_stmt *pPageData;
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sqlite3_value **apVal;
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int nMaxField;
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};
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/*
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** Main recover handle structure.
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*/
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struct sqlite3_recover {
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/* Copies of sqlite3_recover_init[_sql]() parameters */
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sqlite3 *dbIn; /* Input database */
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char *zDb; /* Name of input db ("main" etc.) */
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char *zUri; /* URI for output database */
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void *pSqlCtx; /* SQL callback context */
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int (*xSql)(void*,const char*); /* Pointer to SQL callback function */
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/* Values configured by sqlite3_recover_config() */
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char *zStateDb; /* State database to use (or NULL) */
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char *zLostAndFound; /* Name of lost-and-found table (or NULL) */
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int bFreelistCorrupt; /* SQLITE_RECOVER_FREELIST_CORRUPT setting */
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int bRecoverRowid; /* SQLITE_RECOVER_ROWIDS setting */
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int bSlowIndexes; /* SQLITE_RECOVER_SLOWINDEXES setting */
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int pgsz;
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int detected_pgsz;
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int nReserve;
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u8 *pPage1Disk;
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u8 *pPage1Cache;
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/* Error code and error message */
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int errCode; /* For sqlite3_recover_errcode() */
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char *zErrMsg; /* For sqlite3_recover_errmsg() */
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int eState;
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int bCloseTransaction;
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/* Variables used with eState==RECOVER_STATE_WRITING */
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RecoverStateW1 w1;
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/* Variables used with states RECOVER_STATE_LOSTANDFOUND[123] */
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RecoverStateLAF laf;
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/* Fields used within sqlite3_recover_run() */
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sqlite3 *dbOut; /* Output database */
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sqlite3_stmt *pGetPage; /* SELECT against input db sqlite_dbdata */
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RecoverTable *pTblList; /* List of tables recovered from schema */
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};
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/*
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** The various states in which an sqlite3_recover object may exist:
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**
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** RECOVER_STATE_INIT:
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** The object is initially created in this state. sqlite3_recover_step()
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** has yet to be called. This is the only state in which it is permitted
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** to call sqlite3_recover_config().
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**
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** RECOVER_STATE_WRITING:
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**
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** RECOVER_STATE_LOSTANDFOUND1:
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** State to populate the bitmap of pages used by other tables or the
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** database freelist.
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**
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** RECOVER_STATE_LOSTANDFOUND2:
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** Populate the recovery.map table - used to figure out a "root" page
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** for each lost page from in the database from which records are
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** extracted.
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**
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** RECOVER_STATE_LOSTANDFOUND3:
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** Populate the lost-and-found table itself.
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*/
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#define RECOVER_STATE_INIT 0
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#define RECOVER_STATE_WRITING 1
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#define RECOVER_STATE_LOSTANDFOUND1 2
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#define RECOVER_STATE_LOSTANDFOUND2 3
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#define RECOVER_STATE_LOSTANDFOUND3 4
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#define RECOVER_STATE_SCHEMA2 5
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#define RECOVER_STATE_DONE 6
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/*
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** Global variables used by this extension.
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*/
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typedef struct RecoverGlobal RecoverGlobal;
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struct RecoverGlobal {
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const sqlite3_io_methods *pMethods;
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sqlite3_recover *p;
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};
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static RecoverGlobal recover_g;
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/*
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** Use this static SQLite mutex to protect the globals during the
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** first call to sqlite3_recover_step().
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*/
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#define RECOVER_MUTEX_ID SQLITE_MUTEX_STATIC_APP2
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/*
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** Default value for SQLITE_RECOVER_ROWIDS (sqlite3_recover.bRecoverRowid).
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*/
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#define RECOVER_ROWID_DEFAULT 1
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/*
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** Mutex handling:
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**
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** recoverEnterMutex() - Enter the recovery mutex
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** recoverLeaveMutex() - Leave the recovery mutex
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** recoverAssertMutexHeld() - Assert that the recovery mutex is held
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*/
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#if defined(SQLITE_THREADSAFE) && SQLITE_THREADSAFE==0
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# define recoverEnterMutex()
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# define recoverLeaveMutex()
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#else
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static void recoverEnterMutex(void){
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sqlite3_mutex_enter(sqlite3_mutex_alloc(RECOVER_MUTEX_ID));
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}
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static void recoverLeaveMutex(void){
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sqlite3_mutex_leave(sqlite3_mutex_alloc(RECOVER_MUTEX_ID));
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}
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#endif
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#if SQLITE_THREADSAFE+0>=1 && defined(SQLITE_DEBUG)
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static void recoverAssertMutexHeld(void){
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assert( sqlite3_mutex_held(sqlite3_mutex_alloc(RECOVER_MUTEX_ID)) );
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}
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#else
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# define recoverAssertMutexHeld()
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#endif
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/*
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** Like strlen(). But handles NULL pointer arguments.
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*/
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static int recoverStrlen(const char *zStr){
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if( zStr==0 ) return 0;
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return (int)(strlen(zStr)&0x7fffffff);
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}
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/*
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** This function is a no-op if the recover handle passed as the first
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** argument already contains an error (if p->errCode!=SQLITE_OK).
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**
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** Otherwise, an attempt is made to allocate, zero and return a buffer nByte
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** bytes in size. If successful, a pointer to the new buffer is returned. Or,
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** if an OOM error occurs, NULL is returned and the handle error code
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** (p->errCode) set to SQLITE_NOMEM.
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*/
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static void *recoverMalloc(sqlite3_recover *p, i64 nByte){
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void *pRet = 0;
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assert( nByte>0 );
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if( p->errCode==SQLITE_OK ){
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pRet = sqlite3_malloc64(nByte);
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if( pRet ){
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memset(pRet, 0, nByte);
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}else{
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p->errCode = SQLITE_NOMEM;
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}
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}
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return pRet;
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}
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/*
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** Set the error code and error message for the recover handle passed as
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** the first argument. The error code is set to the value of parameter
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** errCode.
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**
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** Parameter zFmt must be a printf() style formatting string. The handle
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** error message is set to the result of using any trailing arguments for
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** parameter substitutions in the formatting string.
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**
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** For example:
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**
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** recoverError(p, SQLITE_ERROR, "no such table: %s", zTablename);
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*/
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static int recoverError(
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sqlite3_recover *p,
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int errCode,
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const char *zFmt, ...
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){
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char *z = 0;
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va_list ap;
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va_start(ap, zFmt);
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if( zFmt ){
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z = sqlite3_vmprintf(zFmt, ap);
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va_end(ap);
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}
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sqlite3_free(p->zErrMsg);
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p->zErrMsg = z;
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p->errCode = errCode;
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return errCode;
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}
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/*
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** This function is a no-op if p->errCode is initially other than SQLITE_OK.
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** In this case it returns NULL.
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**
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** Otherwise, an attempt is made to allocate and return a bitmap object
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** large enough to store a bit for all page numbers between 1 and nPg,
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** inclusive. The bitmap is initially zeroed.
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*/
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static RecoverBitmap *recoverBitmapAlloc(sqlite3_recover *p, i64 nPg){
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int nElem = (nPg+1+31) / 32;
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int nByte = sizeof(RecoverBitmap) + nElem*sizeof(u32);
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RecoverBitmap *pRet = (RecoverBitmap*)recoverMalloc(p, nByte);
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if( pRet ){
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pRet->nPg = nPg;
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}
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return pRet;
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}
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/*
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** Free a bitmap object allocated by recoverBitmapAlloc().
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*/
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static void recoverBitmapFree(RecoverBitmap *pMap){
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sqlite3_free(pMap);
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}
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/*
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** Set the bit associated with page iPg in bitvec pMap.
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*/
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static void recoverBitmapSet(RecoverBitmap *pMap, i64 iPg){
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if( iPg<=pMap->nPg ){
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int iElem = (iPg / 32);
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int iBit = (iPg % 32);
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pMap->aElem[iElem] |= (((u32)1) << iBit);
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}
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}
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/*
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** Query bitmap object pMap for the state of the bit associated with page
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** iPg. Return 1 if it is set, or 0 otherwise.
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*/
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static int recoverBitmapQuery(RecoverBitmap *pMap, i64 iPg){
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int ret = 1;
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if( iPg<=pMap->nPg && iPg>0 ){
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int iElem = (iPg / 32);
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int iBit = (iPg % 32);
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ret = (pMap->aElem[iElem] & (((u32)1) << iBit)) ? 1 : 0;
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}
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return ret;
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}
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/*
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** Set the recover handle error to the error code and message returned by
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** calling sqlite3_errcode() and sqlite3_errmsg(), respectively, on database
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** handle db.
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*/
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static int recoverDbError(sqlite3_recover *p, sqlite3 *db){
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return recoverError(p, sqlite3_errcode(db), "%s", sqlite3_errmsg(db));
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}
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/*
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** This function is a no-op if recover handle p already contains an error
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** (if p->errCode!=SQLITE_OK).
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**
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** Otherwise, it attempts to prepare the SQL statement in zSql against
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** database handle db. If successful, the statement handle is returned.
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** Or, if an error occurs, NULL is returned and an error left in the
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** recover handle.
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*/
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static sqlite3_stmt *recoverPrepare(
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sqlite3_recover *p,
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sqlite3 *db,
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const char *zSql
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){
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sqlite3_stmt *pStmt = 0;
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if( p->errCode==SQLITE_OK ){
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if( sqlite3_prepare_v2(db, zSql, -1, &pStmt, 0) ){
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recoverDbError(p, db);
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}
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}
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return pStmt;
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}
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|
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/*
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|
** This function is a no-op if recover handle p already contains an error
|
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** (if p->errCode!=SQLITE_OK).
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**
|
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** Otherwise, argument zFmt is used as a printf() style format string,
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** along with any trailing arguments, to create an SQL statement. This
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** SQL statement is prepared against database handle db and, if successful,
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** the statment handle returned. Or, if an error occurs - either during
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** the printf() formatting or when preparing the resulting SQL - an
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** error code and message are left in the recover handle.
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*/
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static sqlite3_stmt *recoverPreparePrintf(
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sqlite3_recover *p,
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sqlite3 *db,
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const char *zFmt, ...
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){
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sqlite3_stmt *pStmt = 0;
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if( p->errCode==SQLITE_OK ){
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va_list ap;
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char *z;
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va_start(ap, zFmt);
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z = sqlite3_vmprintf(zFmt, ap);
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va_end(ap);
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if( z==0 ){
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p->errCode = SQLITE_NOMEM;
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}else{
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pStmt = recoverPrepare(p, db, z);
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sqlite3_free(z);
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}
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}
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return pStmt;
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}
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/*
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** Reset SQLite statement handle pStmt. If the call to sqlite3_reset()
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|
** indicates that an error occurred, and there is not already an error
|
|
** in the recover handle passed as the first argument, set the error
|
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** code and error message appropriately.
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|
**
|
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** This function returns a copy of the statement handle pointer passed
|
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** as the second argument.
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*/
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static sqlite3_stmt *recoverReset(sqlite3_recover *p, sqlite3_stmt *pStmt){
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int rc = sqlite3_reset(pStmt);
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if( rc!=SQLITE_OK && rc!=SQLITE_CONSTRAINT && p->errCode==SQLITE_OK ){
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recoverDbError(p, sqlite3_db_handle(pStmt));
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}
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return pStmt;
|
|
}
|
|
|
|
/*
|
|
** Finalize SQLite statement handle pStmt. If the call to sqlite3_reset()
|
|
** indicates that an error occurred, and there is not already an error
|
|
** in the recover handle passed as the first argument, set the error
|
|
** code and error message appropriately.
|
|
*/
|
|
static void recoverFinalize(sqlite3_recover *p, sqlite3_stmt *pStmt){
|
|
sqlite3 *db = sqlite3_db_handle(pStmt);
|
|
int rc = sqlite3_finalize(pStmt);
|
|
if( rc!=SQLITE_OK && p->errCode==SQLITE_OK ){
|
|
recoverDbError(p, db);
|
|
}
|
|
}
|
|
|
|
/*
|
|
** This function is a no-op if recover handle p already contains an error
|
|
** (if p->errCode!=SQLITE_OK). A copy of p->errCode is returned in this
|
|
** case.
|
|
**
|
|
** Otherwise, execute SQL script zSql. If successful, return SQLITE_OK.
|
|
** Or, if an error occurs, leave an error code and message in the recover
|
|
** handle and return a copy of the error code.
|
|
*/
|
|
static int recoverExec(sqlite3_recover *p, sqlite3 *db, const char *zSql){
|
|
if( p->errCode==SQLITE_OK ){
|
|
int rc = sqlite3_exec(db, zSql, 0, 0, 0);
|
|
if( rc ){
|
|
recoverDbError(p, db);
|
|
}
|
|
}
|
|
return p->errCode;
|
|
}
|
|
|
|
/*
|
|
** Bind the value pVal to parameter iBind of statement pStmt. Leave an
|
|
** error in the recover handle passed as the first argument if an error
|
|
** (e.g. an OOM) occurs.
|
|
*/
|
|
static void recoverBindValue(
|
|
sqlite3_recover *p,
|
|
sqlite3_stmt *pStmt,
|
|
int iBind,
|
|
sqlite3_value *pVal
|
|
){
|
|
if( p->errCode==SQLITE_OK ){
|
|
int rc = sqlite3_bind_value(pStmt, iBind, pVal);
|
|
if( rc ) recoverError(p, rc, 0);
|
|
}
|
|
}
|
|
|
|
/*
|
|
** This function is a no-op if recover handle p already contains an error
|
|
** (if p->errCode!=SQLITE_OK). NULL is returned in this case.
|
|
**
|
|
** Otherwise, an attempt is made to interpret zFmt as a printf() style
|
|
** formatting string and the result of using the trailing arguments for
|
|
** parameter substitution with it written into a buffer obtained from
|
|
** sqlite3_malloc(). If successful, a pointer to the buffer is returned.
|
|
** It is the responsibility of the caller to eventually free the buffer
|
|
** using sqlite3_free().
|
|
**
|
|
** Or, if an error occurs, an error code and message is left in the recover
|
|
** handle and NULL returned.
|
|
*/
|
|
static char *recoverMPrintf(sqlite3_recover *p, const char *zFmt, ...){
|
|
va_list ap;
|
|
char *z;
|
|
va_start(ap, zFmt);
|
|
z = sqlite3_vmprintf(zFmt, ap);
|
|
va_end(ap);
|
|
if( p->errCode==SQLITE_OK ){
|
|
if( z==0 ) p->errCode = SQLITE_NOMEM;
|
|
}else{
|
|
sqlite3_free(z);
|
|
z = 0;
|
|
}
|
|
return z;
|
|
}
|
|
|
|
/*
|
|
** This function is a no-op if recover handle p already contains an error
|
|
** (if p->errCode!=SQLITE_OK). Zero is returned in this case.
|
|
**
|
|
** Otherwise, execute "PRAGMA page_count" against the input database. If
|
|
** successful, return the integer result. Or, if an error occurs, leave an
|
|
** error code and error message in the sqlite3_recover handle and return
|
|
** zero.
|
|
*/
|
|
static i64 recoverPageCount(sqlite3_recover *p){
|
|
i64 nPg = 0;
|
|
if( p->errCode==SQLITE_OK ){
|
|
sqlite3_stmt *pStmt = 0;
|
|
pStmt = recoverPreparePrintf(p, p->dbIn, "PRAGMA %Q.page_count", p->zDb);
|
|
if( pStmt ){
|
|
sqlite3_step(pStmt);
|
|
nPg = sqlite3_column_int64(pStmt, 0);
|
|
}
|
|
recoverFinalize(p, pStmt);
|
|
}
|
|
return nPg;
|
|
}
|
|
|
|
/*
|
|
** Implementation of SQL scalar function "read_i32". The first argument to
|
|
** this function must be a blob. The second a non-negative integer. This
|
|
** function reads and returns a 32-bit big-endian integer from byte
|
|
** offset (4*<arg2>) of the blob.
|
|
**
|
|
** SELECT read_i32(<blob>, <idx>)
|
|
*/
|
|
static void recoverReadI32(
|
|
sqlite3_context *context,
|
|
int argc,
|
|
sqlite3_value **argv
|
|
){
|
|
const unsigned char *pBlob;
|
|
int nBlob;
|
|
int iInt;
|
|
|
|
assert( argc==2 );
|
|
nBlob = sqlite3_value_bytes(argv[0]);
|
|
pBlob = (const unsigned char*)sqlite3_value_blob(argv[0]);
|
|
iInt = sqlite3_value_int(argv[1]) & 0xFFFF;
|
|
|
|
if( (iInt+1)*4<=nBlob ){
|
|
const unsigned char *a = &pBlob[iInt*4];
|
|
i64 iVal = ((i64)a[0]<<24)
|
|
+ ((i64)a[1]<<16)
|
|
+ ((i64)a[2]<< 8)
|
|
+ ((i64)a[3]<< 0);
|
|
sqlite3_result_int64(context, iVal);
|
|
}
|
|
}
|
|
|
|
/*
|
|
** Implementation of SQL scalar function "page_is_used". This function
|
|
** is used as part of the procedure for locating orphan rows for the
|
|
** lost-and-found table, and it depends on those routines having populated
|
|
** the sqlite3_recover.laf.pUsed variable.
|
|
**
|
|
** The only argument to this function is a page-number. It returns true
|
|
** if the page has already been used somehow during data recovery, or false
|
|
** otherwise.
|
|
**
|
|
** SELECT page_is_used(<pgno>);
|
|
*/
|
|
static void recoverPageIsUsed(
|
|
sqlite3_context *pCtx,
|
|
int nArg,
|
|
sqlite3_value **apArg
|
|
){
|
|
sqlite3_recover *p = (sqlite3_recover*)sqlite3_user_data(pCtx);
|
|
i64 pgno = sqlite3_value_int64(apArg[0]);
|
|
assert( nArg==1 );
|
|
sqlite3_result_int(pCtx, recoverBitmapQuery(p->laf.pUsed, pgno));
|
|
}
|
|
|
|
/*
|
|
** The implementation of a user-defined SQL function invoked by the
|
|
** sqlite_dbdata and sqlite_dbptr virtual table modules to access pages
|
|
** of the database being recovered.
|
|
**
|
|
** This function always takes a single integer argument. If the argument
|
|
** is zero, then the value returned is the number of pages in the db being
|
|
** recovered. If the argument is greater than zero, it is a page number.
|
|
** The value returned in this case is an SQL blob containing the data for
|
|
** the identified page of the db being recovered. e.g.
|
|
**
|
|
** SELECT getpage(0); -- return number of pages in db
|
|
** SELECT getpage(4); -- return page 4 of db as a blob of data
|
|
*/
|
|
static void recoverGetPage(
|
|
sqlite3_context *pCtx,
|
|
int nArg,
|
|
sqlite3_value **apArg
|
|
){
|
|
sqlite3_recover *p = (sqlite3_recover*)sqlite3_user_data(pCtx);
|
|
i64 pgno = sqlite3_value_int64(apArg[0]);
|
|
sqlite3_stmt *pStmt = 0;
|
|
|
|
assert( nArg==1 );
|
|
if( pgno==0 ){
|
|
i64 nPg = recoverPageCount(p);
|
|
sqlite3_result_int64(pCtx, nPg);
|
|
return;
|
|
}else{
|
|
if( p->pGetPage==0 ){
|
|
pStmt = p->pGetPage = recoverPreparePrintf(
|
|
p, p->dbIn, "SELECT data FROM sqlite_dbpage(%Q) WHERE pgno=?", p->zDb
|
|
);
|
|
}else if( p->errCode==SQLITE_OK ){
|
|
pStmt = p->pGetPage;
|
|
}
|
|
|
|
if( pStmt ){
|
|
sqlite3_bind_int64(pStmt, 1, pgno);
|
|
if( SQLITE_ROW==sqlite3_step(pStmt) ){
|
|
const u8 *aPg;
|
|
int nPg;
|
|
assert( p->errCode==SQLITE_OK );
|
|
aPg = sqlite3_column_blob(pStmt, 0);
|
|
nPg = sqlite3_column_bytes(pStmt, 0);
|
|
if( pgno==1 && nPg==p->pgsz && 0==memcmp(p->pPage1Cache, aPg, nPg) ){
|
|
aPg = p->pPage1Disk;
|
|
}
|
|
sqlite3_result_blob(pCtx, aPg, nPg-p->nReserve, SQLITE_TRANSIENT);
|
|
}
|
|
recoverReset(p, pStmt);
|
|
}
|
|
}
|
|
|
|
if( p->errCode ){
|
|
if( p->zErrMsg ) sqlite3_result_error(pCtx, p->zErrMsg, -1);
|
|
sqlite3_result_error_code(pCtx, p->errCode);
|
|
}
|
|
}
|
|
|
|
/*
|
|
** Find a string that is not found anywhere in z[]. Return a pointer
|
|
** to that string.
|
|
**
|
|
** Try to use zA and zB first. If both of those are already found in z[]
|
|
** then make up some string and store it in the buffer zBuf.
|
|
*/
|
|
static const char *recoverUnusedString(
|
|
const char *z, /* Result must not appear anywhere in z */
|
|
const char *zA, const char *zB, /* Try these first */
|
|
char *zBuf /* Space to store a generated string */
|
|
){
|
|
unsigned i = 0;
|
|
if( strstr(z, zA)==0 ) return zA;
|
|
if( strstr(z, zB)==0 ) return zB;
|
|
do{
|
|
sqlite3_snprintf(20,zBuf,"(%s%u)", zA, i++);
|
|
}while( strstr(z,zBuf)!=0 );
|
|
return zBuf;
|
|
}
|
|
|
|
/*
|
|
** Implementation of scalar SQL function "escape_crnl". The argument passed to
|
|
** this function is the output of built-in function quote(). If the first
|
|
** character of the input is "'", indicating that the value passed to quote()
|
|
** was a text value, then this function searches the input for "\n" and "\r"
|
|
** characters and adds a wrapper similar to the following:
|
|
**
|
|
** replace(replace(<input>, '\n', char(10), '\r', char(13));
|
|
**
|
|
** Or, if the first character of the input is not "'", then a copy of the input
|
|
** is returned.
|
|
*/
|
|
static void recoverEscapeCrnl(
|
|
sqlite3_context *context,
|
|
int argc,
|
|
sqlite3_value **argv
|
|
){
|
|
const char *zText = (const char*)sqlite3_value_text(argv[0]);
|
|
(void)argc;
|
|
if( zText && zText[0]=='\'' ){
|
|
int nText = sqlite3_value_bytes(argv[0]);
|
|
int i;
|
|
char zBuf1[20];
|
|
char zBuf2[20];
|
|
const char *zNL = 0;
|
|
const char *zCR = 0;
|
|
int nCR = 0;
|
|
int nNL = 0;
|
|
|
|
for(i=0; zText[i]; i++){
|
|
if( zNL==0 && zText[i]=='\n' ){
|
|
zNL = recoverUnusedString(zText, "\\n", "\\012", zBuf1);
|
|
nNL = (int)strlen(zNL);
|
|
}
|
|
if( zCR==0 && zText[i]=='\r' ){
|
|
zCR = recoverUnusedString(zText, "\\r", "\\015", zBuf2);
|
|
nCR = (int)strlen(zCR);
|
|
}
|
|
}
|
|
|
|
if( zNL || zCR ){
|
|
int iOut = 0;
|
|
i64 nMax = (nNL > nCR) ? nNL : nCR;
|
|
i64 nAlloc = nMax * nText + (nMax+64)*2;
|
|
char *zOut = (char*)sqlite3_malloc64(nAlloc);
|
|
if( zOut==0 ){
|
|
sqlite3_result_error_nomem(context);
|
|
return;
|
|
}
|
|
|
|
if( zNL && zCR ){
|
|
memcpy(&zOut[iOut], "replace(replace(", 16);
|
|
iOut += 16;
|
|
}else{
|
|
memcpy(&zOut[iOut], "replace(", 8);
|
|
iOut += 8;
|
|
}
|
|
for(i=0; zText[i]; i++){
|
|
if( zText[i]=='\n' ){
|
|
memcpy(&zOut[iOut], zNL, nNL);
|
|
iOut += nNL;
|
|
}else if( zText[i]=='\r' ){
|
|
memcpy(&zOut[iOut], zCR, nCR);
|
|
iOut += nCR;
|
|
}else{
|
|
zOut[iOut] = zText[i];
|
|
iOut++;
|
|
}
|
|
}
|
|
|
|
if( zNL ){
|
|
memcpy(&zOut[iOut], ",'", 2); iOut += 2;
|
|
memcpy(&zOut[iOut], zNL, nNL); iOut += nNL;
|
|
memcpy(&zOut[iOut], "', char(10))", 12); iOut += 12;
|
|
}
|
|
if( zCR ){
|
|
memcpy(&zOut[iOut], ",'", 2); iOut += 2;
|
|
memcpy(&zOut[iOut], zCR, nCR); iOut += nCR;
|
|
memcpy(&zOut[iOut], "', char(13))", 12); iOut += 12;
|
|
}
|
|
|
|
sqlite3_result_text(context, zOut, iOut, SQLITE_TRANSIENT);
|
|
sqlite3_free(zOut);
|
|
return;
|
|
}
|
|
}
|
|
|
|
sqlite3_result_value(context, argv[0]);
|
|
}
|
|
|
|
/*
|
|
** This function is a no-op if recover handle p already contains an error
|
|
** (if p->errCode!=SQLITE_OK). A copy of the error code is returned in
|
|
** this case.
|
|
**
|
|
** Otherwise, attempt to populate temporary table "recovery.schema" with the
|
|
** parts of the database schema that can be extracted from the input database.
|
|
**
|
|
** If no error occurs, SQLITE_OK is returned. Otherwise, an error code
|
|
** and error message are left in the recover handle and a copy of the
|
|
** error code returned. It is not considered an error if part of all of
|
|
** the database schema cannot be recovered due to corruption.
|
|
*/
|
|
static int recoverCacheSchema(sqlite3_recover *p){
|
|
return recoverExec(p, p->dbOut,
|
|
"WITH RECURSIVE pages(p) AS ("
|
|
" SELECT 1"
|
|
" UNION"
|
|
" SELECT child FROM sqlite_dbptr('getpage()'), pages WHERE pgno=p"
|
|
")"
|
|
"INSERT INTO recovery.schema SELECT"
|
|
" max(CASE WHEN field=0 THEN value ELSE NULL END),"
|
|
" max(CASE WHEN field=1 THEN value ELSE NULL END),"
|
|
" max(CASE WHEN field=2 THEN value ELSE NULL END),"
|
|
" max(CASE WHEN field=3 THEN value ELSE NULL END),"
|
|
" max(CASE WHEN field=4 THEN value ELSE NULL END)"
|
|
"FROM sqlite_dbdata('getpage()') WHERE pgno IN ("
|
|
" SELECT p FROM pages"
|
|
") GROUP BY pgno, cell"
|
|
);
|
|
}
|
|
|
|
/*
|
|
** If this recover handle is not in SQL callback mode (i.e. was not created
|
|
** using sqlite3_recover_init_sql()) of if an error has already occurred,
|
|
** this function is a no-op. Otherwise, issue a callback with SQL statement
|
|
** zSql as the parameter.
|
|
**
|
|
** If the callback returns non-zero, set the recover handle error code to
|
|
** the value returned (so that the caller will abandon processing).
|
|
*/
|
|
static void recoverSqlCallback(sqlite3_recover *p, const char *zSql){
|
|
if( p->errCode==SQLITE_OK && p->xSql ){
|
|
int res = p->xSql(p->pSqlCtx, zSql);
|
|
if( res ){
|
|
recoverError(p, SQLITE_ERROR, "callback returned an error - %d", res);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
** Transfer the following settings from the input database to the output
|
|
** database:
|
|
**
|
|
** + page-size,
|
|
** + auto-vacuum settings,
|
|
** + database encoding,
|
|
** + user-version (PRAGMA user_version), and
|
|
** + application-id (PRAGMA application_id), and
|
|
*/
|
|
static void recoverTransferSettings(sqlite3_recover *p){
|
|
const char *aPragma[] = {
|
|
"encoding",
|
|
"page_size",
|
|
"auto_vacuum",
|
|
"user_version",
|
|
"application_id"
|
|
};
|
|
int ii;
|
|
|
|
/* Truncate the output database to 0 pages in size. This is done by
|
|
** opening a new, empty, temp db, then using the backup API to clobber
|
|
** any existing output db with a copy of it. */
|
|
if( p->errCode==SQLITE_OK ){
|
|
sqlite3 *db2 = 0;
|
|
int rc = sqlite3_open("", &db2);
|
|
if( rc!=SQLITE_OK ){
|
|
recoverDbError(p, db2);
|
|
return;
|
|
}
|
|
|
|
for(ii=0; ii<(int)(sizeof(aPragma)/sizeof(aPragma[0])); ii++){
|
|
const char *zPrag = aPragma[ii];
|
|
sqlite3_stmt *p1 = 0;
|
|
p1 = recoverPreparePrintf(p, p->dbIn, "PRAGMA %Q.%s", p->zDb, zPrag);
|
|
if( p->errCode==SQLITE_OK && sqlite3_step(p1)==SQLITE_ROW ){
|
|
const char *zArg = (const char*)sqlite3_column_text(p1, 0);
|
|
char *z2 = recoverMPrintf(p, "PRAGMA %s = %Q", zPrag, zArg);
|
|
recoverSqlCallback(p, z2);
|
|
recoverExec(p, db2, z2);
|
|
sqlite3_free(z2);
|
|
if( zArg==0 ){
|
|
recoverError(p, SQLITE_NOMEM, 0);
|
|
}
|
|
}
|
|
recoverFinalize(p, p1);
|
|
}
|
|
recoverExec(p, db2, "CREATE TABLE t1(a); DROP TABLE t1;");
|
|
|
|
if( p->errCode==SQLITE_OK ){
|
|
sqlite3 *db = p->dbOut;
|
|
sqlite3_backup *pBackup = sqlite3_backup_init(db, "main", db2, "main");
|
|
if( pBackup ){
|
|
sqlite3_backup_step(pBackup, -1);
|
|
p->errCode = sqlite3_backup_finish(pBackup);
|
|
}else{
|
|
recoverDbError(p, db);
|
|
}
|
|
}
|
|
|
|
sqlite3_close(db2);
|
|
}
|
|
}
|
|
|
|
/*
|
|
** This function is a no-op if recover handle p already contains an error
|
|
** (if p->errCode!=SQLITE_OK). A copy of the error code is returned in
|
|
** this case.
|
|
**
|
|
** Otherwise, an attempt is made to open the output database, attach
|
|
** and create the schema of the temporary database used to store
|
|
** intermediate data, and to register all required user functions and
|
|
** virtual table modules with the output handle.
|
|
**
|
|
** If no error occurs, SQLITE_OK is returned. Otherwise, an error code
|
|
** and error message are left in the recover handle and a copy of the
|
|
** error code returned.
|
|
*/
|
|
static int recoverOpenOutput(sqlite3_recover *p){
|
|
struct Func {
|
|
const char *zName;
|
|
int nArg;
|
|
void (*xFunc)(sqlite3_context*,int,sqlite3_value **);
|
|
} aFunc[] = {
|
|
{ "getpage", 1, recoverGetPage },
|
|
{ "page_is_used", 1, recoverPageIsUsed },
|
|
{ "read_i32", 2, recoverReadI32 },
|
|
{ "escape_crnl", 1, recoverEscapeCrnl },
|
|
};
|
|
|
|
const int flags = SQLITE_OPEN_URI|SQLITE_OPEN_CREATE|SQLITE_OPEN_READWRITE;
|
|
sqlite3 *db = 0; /* New database handle */
|
|
int ii; /* For iterating through aFunc[] */
|
|
|
|
assert( p->dbOut==0 );
|
|
|
|
if( sqlite3_open_v2(p->zUri, &db, flags, 0) ){
|
|
recoverDbError(p, db);
|
|
}
|
|
|
|
/* Register the sqlite_dbdata and sqlite_dbptr virtual table modules.
|
|
** These two are registered with the output database handle - this
|
|
** module depends on the input handle supporting the sqlite_dbpage
|
|
** virtual table only. */
|
|
if( p->errCode==SQLITE_OK ){
|
|
p->errCode = sqlite3_dbdata_init(db, 0, 0);
|
|
}
|
|
|
|
/* Register the custom user-functions with the output handle. */
|
|
for(ii=0;
|
|
p->errCode==SQLITE_OK && ii<(int)(sizeof(aFunc)/sizeof(aFunc[0]));
|
|
ii++){
|
|
p->errCode = sqlite3_create_function(db, aFunc[ii].zName,
|
|
aFunc[ii].nArg, SQLITE_UTF8, (void*)p, aFunc[ii].xFunc, 0, 0
|
|
);
|
|
}
|
|
|
|
p->dbOut = db;
|
|
return p->errCode;
|
|
}
|
|
|
|
/*
|
|
** Attach the auxiliary database 'recovery' to the output database handle.
|
|
** This temporary database is used during the recovery process and then
|
|
** discarded.
|
|
*/
|
|
static void recoverOpenRecovery(sqlite3_recover *p){
|
|
char *zSql = recoverMPrintf(p, "ATTACH %Q AS recovery;", p->zStateDb);
|
|
recoverExec(p, p->dbOut, zSql);
|
|
recoverExec(p, p->dbOut,
|
|
"PRAGMA writable_schema = 1;"
|
|
"CREATE TABLE recovery.map(pgno INTEGER PRIMARY KEY, parent INT);"
|
|
"CREATE TABLE recovery.schema(type, name, tbl_name, rootpage, sql);"
|
|
);
|
|
sqlite3_free(zSql);
|
|
}
|
|
|
|
|
|
/*
|
|
** This function is a no-op if recover handle p already contains an error
|
|
** (if p->errCode!=SQLITE_OK).
|
|
**
|
|
** Otherwise, argument zName must be the name of a table that has just been
|
|
** created in the output database. This function queries the output db
|
|
** for the schema of said table, and creates a RecoverTable object to
|
|
** store the schema in memory. The new RecoverTable object is linked into
|
|
** the list at sqlite3_recover.pTblList.
|
|
**
|
|
** Parameter iRoot must be the root page of table zName in the INPUT
|
|
** database.
|
|
*/
|
|
static void recoverAddTable(
|
|
sqlite3_recover *p,
|
|
const char *zName, /* Name of table created in output db */
|
|
i64 iRoot /* Root page of same table in INPUT db */
|
|
){
|
|
sqlite3_stmt *pStmt = recoverPreparePrintf(p, p->dbOut,
|
|
"PRAGMA table_xinfo(%Q)", zName
|
|
);
|
|
|
|
if( pStmt ){
|
|
int iPk = -1;
|
|
int iBind = 1;
|
|
RecoverTable *pNew = 0;
|
|
int nCol = 0;
|
|
int nName = recoverStrlen(zName);
|
|
int nByte = 0;
|
|
while( sqlite3_step(pStmt)==SQLITE_ROW ){
|
|
nCol++;
|
|
nByte += (sqlite3_column_bytes(pStmt, 1)+1);
|
|
}
|
|
nByte += sizeof(RecoverTable) + nCol*sizeof(RecoverColumn) + nName+1;
|
|
recoverReset(p, pStmt);
|
|
|
|
pNew = recoverMalloc(p, nByte);
|
|
if( pNew ){
|
|
int i = 0;
|
|
int iField = 0;
|
|
char *csr = 0;
|
|
pNew->aCol = (RecoverColumn*)&pNew[1];
|
|
pNew->zTab = csr = (char*)&pNew->aCol[nCol];
|
|
pNew->nCol = nCol;
|
|
pNew->iRoot = iRoot;
|
|
memcpy(csr, zName, nName);
|
|
csr += nName+1;
|
|
|
|
for(i=0; sqlite3_step(pStmt)==SQLITE_ROW; i++){
|
|
int iPKF = sqlite3_column_int(pStmt, 5);
|
|
int n = sqlite3_column_bytes(pStmt, 1);
|
|
const char *z = (const char*)sqlite3_column_text(pStmt, 1);
|
|
const char *zType = (const char*)sqlite3_column_text(pStmt, 2);
|
|
int eHidden = sqlite3_column_int(pStmt, 6);
|
|
|
|
if( iPk==-1 && iPKF==1 && !sqlite3_stricmp("integer", zType) ) iPk = i;
|
|
if( iPKF>1 ) iPk = -2;
|
|
pNew->aCol[i].zCol = csr;
|
|
pNew->aCol[i].eHidden = eHidden;
|
|
if( eHidden==RECOVER_EHIDDEN_VIRTUAL ){
|
|
pNew->aCol[i].iField = -1;
|
|
}else{
|
|
pNew->aCol[i].iField = iField++;
|
|
}
|
|
if( eHidden!=RECOVER_EHIDDEN_VIRTUAL
|
|
&& eHidden!=RECOVER_EHIDDEN_STORED
|
|
){
|
|
pNew->aCol[i].iBind = iBind++;
|
|
}
|
|
memcpy(csr, z, n);
|
|
csr += (n+1);
|
|
}
|
|
|
|
pNew->pNext = p->pTblList;
|
|
p->pTblList = pNew;
|
|
pNew->bIntkey = 1;
|
|
}
|
|
|
|
recoverFinalize(p, pStmt);
|
|
|
|
pStmt = recoverPreparePrintf(p, p->dbOut, "PRAGMA index_xinfo(%Q)", zName);
|
|
while( pStmt && sqlite3_step(pStmt)==SQLITE_ROW ){
|
|
int iField = sqlite3_column_int(pStmt, 0);
|
|
int iCol = sqlite3_column_int(pStmt, 1);
|
|
|
|
assert( iCol<pNew->nCol );
|
|
pNew->aCol[iCol].iField = iField;
|
|
|
|
pNew->bIntkey = 0;
|
|
iPk = -2;
|
|
}
|
|
recoverFinalize(p, pStmt);
|
|
|
|
if( p->errCode==SQLITE_OK ){
|
|
if( iPk>=0 ){
|
|
pNew->aCol[iPk].bIPK = 1;
|
|
}else if( pNew->bIntkey ){
|
|
pNew->iRowidBind = iBind++;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
** This function is called after recoverCacheSchema() has cached those parts
|
|
** of the input database schema that could be recovered in temporary table
|
|
** "recovery.schema". This function creates in the output database copies
|
|
** of all parts of that schema that must be created before the tables can
|
|
** be populated. Specifically, this means:
|
|
**
|
|
** * all tables that are not VIRTUAL, and
|
|
** * UNIQUE indexes.
|
|
**
|
|
** If the recovery handle uses SQL callbacks, then callbacks containing
|
|
** the associated "CREATE TABLE" and "CREATE INDEX" statements are made.
|
|
**
|
|
** Additionally, records are added to the sqlite_schema table of the
|
|
** output database for any VIRTUAL tables. The CREATE VIRTUAL TABLE
|
|
** records are written directly to sqlite_schema, not actually executed.
|
|
** If the handle is in SQL callback mode, then callbacks are invoked
|
|
** with equivalent SQL statements.
|
|
*/
|
|
static int recoverWriteSchema1(sqlite3_recover *p){
|
|
sqlite3_stmt *pSelect = 0;
|
|
sqlite3_stmt *pTblname = 0;
|
|
|
|
pSelect = recoverPrepare(p, p->dbOut,
|
|
"WITH dbschema(rootpage, name, sql, tbl, isVirtual, isIndex) AS ("
|
|
" SELECT rootpage, name, sql, "
|
|
" type='table', "
|
|
" sql LIKE 'create virtual%',"
|
|
" (type='index' AND (sql LIKE '%unique%' OR ?1))"
|
|
" FROM recovery.schema"
|
|
")"
|
|
"SELECT rootpage, tbl, isVirtual, name, sql"
|
|
" FROM dbschema "
|
|
" WHERE tbl OR isIndex"
|
|
" ORDER BY tbl DESC, name=='sqlite_sequence' DESC"
|
|
);
|
|
|
|
pTblname = recoverPrepare(p, p->dbOut,
|
|
"SELECT name FROM sqlite_schema "
|
|
"WHERE type='table' ORDER BY rowid DESC LIMIT 1"
|
|
);
|
|
|
|
if( pSelect ){
|
|
sqlite3_bind_int(pSelect, 1, p->bSlowIndexes);
|
|
while( sqlite3_step(pSelect)==SQLITE_ROW ){
|
|
i64 iRoot = sqlite3_column_int64(pSelect, 0);
|
|
int bTable = sqlite3_column_int(pSelect, 1);
|
|
int bVirtual = sqlite3_column_int(pSelect, 2);
|
|
const char *zName = (const char*)sqlite3_column_text(pSelect, 3);
|
|
const char *zSql = (const char*)sqlite3_column_text(pSelect, 4);
|
|
char *zFree = 0;
|
|
int rc = SQLITE_OK;
|
|
|
|
if( bVirtual ){
|
|
zSql = (const char*)(zFree = recoverMPrintf(p,
|
|
"INSERT INTO sqlite_schema VALUES('table', %Q, %Q, 0, %Q)",
|
|
zName, zName, zSql
|
|
));
|
|
}
|
|
rc = sqlite3_exec(p->dbOut, zSql, 0, 0, 0);
|
|
if( rc==SQLITE_OK ){
|
|
recoverSqlCallback(p, zSql);
|
|
if( bTable && !bVirtual ){
|
|
if( SQLITE_ROW==sqlite3_step(pTblname) ){
|
|
const char *zTbl = (const char*)sqlite3_column_text(pTblname, 0);
|
|
recoverAddTable(p, zTbl, iRoot);
|
|
}
|
|
recoverReset(p, pTblname);
|
|
}
|
|
}else if( rc!=SQLITE_ERROR ){
|
|
recoverDbError(p, p->dbOut);
|
|
}
|
|
sqlite3_free(zFree);
|
|
}
|
|
}
|
|
recoverFinalize(p, pSelect);
|
|
recoverFinalize(p, pTblname);
|
|
|
|
return p->errCode;
|
|
}
|
|
|
|
/*
|
|
** This function is called after the output database has been populated. It
|
|
** adds all recovered schema elements that were not created in the output
|
|
** database by recoverWriteSchema1() - everything except for tables and
|
|
** UNIQUE indexes. Specifically:
|
|
**
|
|
** * views,
|
|
** * triggers,
|
|
** * non-UNIQUE indexes.
|
|
**
|
|
** If the recover handle is in SQL callback mode, then equivalent callbacks
|
|
** are issued to create the schema elements.
|
|
*/
|
|
static int recoverWriteSchema2(sqlite3_recover *p){
|
|
sqlite3_stmt *pSelect = 0;
|
|
|
|
pSelect = recoverPrepare(p, p->dbOut,
|
|
p->bSlowIndexes ?
|
|
"SELECT rootpage, sql FROM recovery.schema "
|
|
" WHERE type!='table' AND type!='index'"
|
|
:
|
|
"SELECT rootpage, sql FROM recovery.schema "
|
|
" WHERE type!='table' AND (type!='index' OR sql NOT LIKE '%unique%')"
|
|
);
|
|
|
|
if( pSelect ){
|
|
while( sqlite3_step(pSelect)==SQLITE_ROW ){
|
|
const char *zSql = (const char*)sqlite3_column_text(pSelect, 1);
|
|
int rc = sqlite3_exec(p->dbOut, zSql, 0, 0, 0);
|
|
if( rc==SQLITE_OK ){
|
|
recoverSqlCallback(p, zSql);
|
|
}else if( rc!=SQLITE_ERROR ){
|
|
recoverDbError(p, p->dbOut);
|
|
}
|
|
}
|
|
}
|
|
recoverFinalize(p, pSelect);
|
|
|
|
return p->errCode;
|
|
}
|
|
|
|
/*
|
|
** This function is a no-op if recover handle p already contains an error
|
|
** (if p->errCode!=SQLITE_OK). In this case it returns NULL.
|
|
**
|
|
** Otherwise, if the recover handle is configured to create an output
|
|
** database (was created by sqlite3_recover_init()), then this function
|
|
** prepares and returns an SQL statement to INSERT a new record into table
|
|
** pTab, assuming the first nField fields of a record extracted from disk
|
|
** are valid.
|
|
**
|
|
** For example, if table pTab is:
|
|
**
|
|
** CREATE TABLE name(a, b GENERATED ALWAYS AS (a+1) STORED, c, d, e);
|
|
**
|
|
** And nField is 4, then the SQL statement prepared and returned is:
|
|
**
|
|
** INSERT INTO (a, c, d) VALUES (?1, ?2, ?3);
|
|
**
|
|
** In this case even though 4 values were extracted from the input db,
|
|
** only 3 are written to the output, as the generated STORED column
|
|
** cannot be written.
|
|
**
|
|
** If the recover handle is in SQL callback mode, then the SQL statement
|
|
** prepared is such that evaluating it returns a single row containing
|
|
** a single text value - itself an SQL statement similar to the above,
|
|
** except with SQL literals in place of the variables. For example:
|
|
**
|
|
** SELECT 'INSERT INTO (a, c, d) VALUES ('
|
|
** || quote(?1) || ', '
|
|
** || quote(?2) || ', '
|
|
** || quote(?3) || ')';
|
|
**
|
|
** In either case, it is the responsibility of the caller to eventually
|
|
** free the statement handle using sqlite3_finalize().
|
|
*/
|
|
static sqlite3_stmt *recoverInsertStmt(
|
|
sqlite3_recover *p,
|
|
RecoverTable *pTab,
|
|
int nField
|
|
){
|
|
sqlite3_stmt *pRet = 0;
|
|
const char *zSep = "";
|
|
const char *zSqlSep = "";
|
|
char *zSql = 0;
|
|
char *zFinal = 0;
|
|
char *zBind = 0;
|
|
int ii;
|
|
int bSql = p->xSql ? 1 : 0;
|
|
|
|
if( nField<=0 ) return 0;
|
|
|
|
assert( nField<=pTab->nCol );
|
|
|
|
zSql = recoverMPrintf(p, "INSERT OR IGNORE INTO %Q(", pTab->zTab);
|
|
|
|
if( pTab->iRowidBind ){
|
|
assert( pTab->bIntkey );
|
|
zSql = recoverMPrintf(p, "%z_rowid_", zSql);
|
|
if( bSql ){
|
|
zBind = recoverMPrintf(p, "%zquote(?%d)", zBind, pTab->iRowidBind);
|
|
}else{
|
|
zBind = recoverMPrintf(p, "%z?%d", zBind, pTab->iRowidBind);
|
|
}
|
|
zSqlSep = "||', '||";
|
|
zSep = ", ";
|
|
}
|
|
|
|
for(ii=0; ii<nField; ii++){
|
|
int eHidden = pTab->aCol[ii].eHidden;
|
|
if( eHidden!=RECOVER_EHIDDEN_VIRTUAL
|
|
&& eHidden!=RECOVER_EHIDDEN_STORED
|
|
){
|
|
assert( pTab->aCol[ii].iField>=0 && pTab->aCol[ii].iBind>=1 );
|
|
zSql = recoverMPrintf(p, "%z%s%Q", zSql, zSep, pTab->aCol[ii].zCol);
|
|
|
|
if( bSql ){
|
|
zBind = recoverMPrintf(p,
|
|
"%z%sescape_crnl(quote(?%d))", zBind, zSqlSep, pTab->aCol[ii].iBind
|
|
);
|
|
zSqlSep = "||', '||";
|
|
}else{
|
|
zBind = recoverMPrintf(p, "%z%s?%d", zBind, zSep, pTab->aCol[ii].iBind);
|
|
}
|
|
zSep = ", ";
|
|
}
|
|
}
|
|
|
|
if( bSql ){
|
|
zFinal = recoverMPrintf(p, "SELECT %Q || ') VALUES (' || %s || ')'",
|
|
zSql, zBind
|
|
);
|
|
}else{
|
|
zFinal = recoverMPrintf(p, "%s) VALUES (%s)", zSql, zBind);
|
|
}
|
|
|
|
pRet = recoverPrepare(p, p->dbOut, zFinal);
|
|
sqlite3_free(zSql);
|
|
sqlite3_free(zBind);
|
|
sqlite3_free(zFinal);
|
|
|
|
return pRet;
|
|
}
|
|
|
|
|
|
/*
|
|
** Search the list of RecoverTable objects at p->pTblList for one that
|
|
** has root page iRoot in the input database. If such an object is found,
|
|
** return a pointer to it. Otherwise, return NULL.
|
|
*/
|
|
static RecoverTable *recoverFindTable(sqlite3_recover *p, u32 iRoot){
|
|
RecoverTable *pRet = 0;
|
|
for(pRet=p->pTblList; pRet && pRet->iRoot!=iRoot; pRet=pRet->pNext);
|
|
return pRet;
|
|
}
|
|
|
|
/*
|
|
** This function attempts to create a lost and found table within the
|
|
** output db. If successful, it returns a pointer to a buffer containing
|
|
** the name of the new table. It is the responsibility of the caller to
|
|
** eventually free this buffer using sqlite3_free().
|
|
**
|
|
** If an error occurs, NULL is returned and an error code and error
|
|
** message left in the recover handle.
|
|
*/
|
|
static char *recoverLostAndFoundCreate(
|
|
sqlite3_recover *p, /* Recover object */
|
|
int nField /* Number of column fields in new table */
|
|
){
|
|
char *zTbl = 0;
|
|
sqlite3_stmt *pProbe = 0;
|
|
int ii = 0;
|
|
|
|
pProbe = recoverPrepare(p, p->dbOut,
|
|
"SELECT 1 FROM sqlite_schema WHERE name=?"
|
|
);
|
|
for(ii=-1; zTbl==0 && p->errCode==SQLITE_OK && ii<1000; ii++){
|
|
int bFail = 0;
|
|
if( ii<0 ){
|
|
zTbl = recoverMPrintf(p, "%s", p->zLostAndFound);
|
|
}else{
|
|
zTbl = recoverMPrintf(p, "%s_%d", p->zLostAndFound, ii);
|
|
}
|
|
|
|
if( p->errCode==SQLITE_OK ){
|
|
sqlite3_bind_text(pProbe, 1, zTbl, -1, SQLITE_STATIC);
|
|
if( SQLITE_ROW==sqlite3_step(pProbe) ){
|
|
bFail = 1;
|
|
}
|
|
recoverReset(p, pProbe);
|
|
}
|
|
|
|
if( bFail ){
|
|
sqlite3_clear_bindings(pProbe);
|
|
sqlite3_free(zTbl);
|
|
zTbl = 0;
|
|
}
|
|
}
|
|
recoverFinalize(p, pProbe);
|
|
|
|
if( zTbl ){
|
|
const char *zSep = 0;
|
|
char *zField = 0;
|
|
char *zSql = 0;
|
|
|
|
zSep = "rootpgno INTEGER, pgno INTEGER, nfield INTEGER, id INTEGER, ";
|
|
for(ii=0; p->errCode==SQLITE_OK && ii<nField; ii++){
|
|
zField = recoverMPrintf(p, "%z%sc%d", zField, zSep, ii);
|
|
zSep = ", ";
|
|
}
|
|
|
|
zSql = recoverMPrintf(p, "CREATE TABLE %s(%s)", zTbl, zField);
|
|
sqlite3_free(zField);
|
|
|
|
recoverExec(p, p->dbOut, zSql);
|
|
recoverSqlCallback(p, zSql);
|
|
sqlite3_free(zSql);
|
|
}else if( p->errCode==SQLITE_OK ){
|
|
recoverError(
|
|
p, SQLITE_ERROR, "failed to create %s output table", p->zLostAndFound
|
|
);
|
|
}
|
|
|
|
return zTbl;
|
|
}
|
|
|
|
/*
|
|
** Synthesize and prepare an INSERT statement to write to the lost_and_found
|
|
** table in the output database. The name of the table is zTab, and it has
|
|
** nField c* fields.
|
|
*/
|
|
static sqlite3_stmt *recoverLostAndFoundInsert(
|
|
sqlite3_recover *p,
|
|
const char *zTab,
|
|
int nField
|
|
){
|
|
int nTotal = nField + 4;
|
|
int ii;
|
|
char *zBind = 0;
|
|
sqlite3_stmt *pRet = 0;
|
|
|
|
if( p->xSql==0 ){
|
|
for(ii=0; ii<nTotal; ii++){
|
|
zBind = recoverMPrintf(p, "%z%s?", zBind, zBind?", ":"", ii);
|
|
}
|
|
pRet = recoverPreparePrintf(
|
|
p, p->dbOut, "INSERT INTO %s VALUES(%s)", zTab, zBind
|
|
);
|
|
}else{
|
|
const char *zSep = "";
|
|
for(ii=0; ii<nTotal; ii++){
|
|
zBind = recoverMPrintf(p, "%z%squote(?)", zBind, zSep);
|
|
zSep = "|| ', ' ||";
|
|
}
|
|
pRet = recoverPreparePrintf(
|
|
p, p->dbOut, "SELECT 'INSERT INTO %s VALUES(' || %s || ')'", zTab, zBind
|
|
);
|
|
}
|
|
|
|
sqlite3_free(zBind);
|
|
return pRet;
|
|
}
|
|
|
|
/*
|
|
** Input database page iPg contains data that will be written to the
|
|
** lost-and-found table of the output database. This function attempts
|
|
** to identify the root page of the tree that page iPg belonged to.
|
|
** If successful, it sets output variable (*piRoot) to the page number
|
|
** of the root page and returns SQLITE_OK. Otherwise, if an error occurs,
|
|
** an SQLite error code is returned and the final value of *piRoot
|
|
** undefined.
|
|
*/
|
|
static int recoverLostAndFoundFindRoot(
|
|
sqlite3_recover *p,
|
|
i64 iPg,
|
|
i64 *piRoot
|
|
){
|
|
RecoverStateLAF *pLaf = &p->laf;
|
|
|
|
if( pLaf->pFindRoot==0 ){
|
|
pLaf->pFindRoot = recoverPrepare(p, p->dbOut,
|
|
"WITH RECURSIVE p(pgno) AS ("
|
|
" SELECT ?"
|
|
" UNION"
|
|
" SELECT parent FROM recovery.map AS m, p WHERE m.pgno=p.pgno"
|
|
") "
|
|
"SELECT p.pgno FROM p, recovery.map m WHERE m.pgno=p.pgno "
|
|
" AND m.parent IS NULL"
|
|
);
|
|
}
|
|
if( p->errCode==SQLITE_OK ){
|
|
sqlite3_bind_int64(pLaf->pFindRoot, 1, iPg);
|
|
if( sqlite3_step(pLaf->pFindRoot)==SQLITE_ROW ){
|
|
*piRoot = sqlite3_column_int64(pLaf->pFindRoot, 0);
|
|
}else{
|
|
*piRoot = iPg;
|
|
}
|
|
recoverReset(p, pLaf->pFindRoot);
|
|
}
|
|
return p->errCode;
|
|
}
|
|
|
|
/*
|
|
** Recover data from page iPage of the input database and write it to
|
|
** the lost-and-found table in the output database.
|
|
*/
|
|
static void recoverLostAndFoundOnePage(sqlite3_recover *p, i64 iPage){
|
|
RecoverStateLAF *pLaf = &p->laf;
|
|
sqlite3_value **apVal = pLaf->apVal;
|
|
sqlite3_stmt *pPageData = pLaf->pPageData;
|
|
sqlite3_stmt *pInsert = pLaf->pInsert;
|
|
|
|
int nVal = -1;
|
|
int iPrevCell = 0;
|
|
i64 iRoot = 0;
|
|
int bHaveRowid = 0;
|
|
i64 iRowid = 0;
|
|
int ii = 0;
|
|
|
|
if( recoverLostAndFoundFindRoot(p, iPage, &iRoot) ) return;
|
|
sqlite3_bind_int64(pPageData, 1, iPage);
|
|
while( p->errCode==SQLITE_OK && SQLITE_ROW==sqlite3_step(pPageData) ){
|
|
int iCell = sqlite3_column_int64(pPageData, 0);
|
|
int iField = sqlite3_column_int64(pPageData, 1);
|
|
|
|
if( iPrevCell!=iCell && nVal>=0 ){
|
|
/* Insert the new row */
|
|
sqlite3_bind_int64(pInsert, 1, iRoot); /* rootpgno */
|
|
sqlite3_bind_int64(pInsert, 2, iPage); /* pgno */
|
|
sqlite3_bind_int(pInsert, 3, nVal); /* nfield */
|
|
if( bHaveRowid ){
|
|
sqlite3_bind_int64(pInsert, 4, iRowid); /* id */
|
|
}
|
|
for(ii=0; ii<nVal; ii++){
|
|
recoverBindValue(p, pInsert, 5+ii, apVal[ii]);
|
|
}
|
|
if( sqlite3_step(pInsert)==SQLITE_ROW ){
|
|
recoverSqlCallback(p, (const char*)sqlite3_column_text(pInsert, 0));
|
|
}
|
|
recoverReset(p, pInsert);
|
|
|
|
/* Discard the accumulated row data */
|
|
for(ii=0; ii<nVal; ii++){
|
|
sqlite3_value_free(apVal[ii]);
|
|
apVal[ii] = 0;
|
|
}
|
|
sqlite3_clear_bindings(pInsert);
|
|
bHaveRowid = 0;
|
|
nVal = -1;
|
|
}
|
|
|
|
if( iCell<0 ) break;
|
|
|
|
if( iField<0 ){
|
|
assert( nVal==-1 );
|
|
iRowid = sqlite3_column_int64(pPageData, 2);
|
|
bHaveRowid = 1;
|
|
nVal = 0;
|
|
}else if( iField<pLaf->nMaxField ){
|
|
sqlite3_value *pVal = sqlite3_column_value(pPageData, 2);
|
|
apVal[iField] = sqlite3_value_dup(pVal);
|
|
assert( iField==nVal || (nVal==-1 && iField==0) );
|
|
nVal = iField+1;
|
|
if( apVal[iField]==0 ){
|
|
recoverError(p, SQLITE_NOMEM, 0);
|
|
}
|
|
}
|
|
|
|
iPrevCell = iCell;
|
|
}
|
|
recoverReset(p, pPageData);
|
|
|
|
for(ii=0; ii<nVal; ii++){
|
|
sqlite3_value_free(apVal[ii]);
|
|
apVal[ii] = 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
** Perform one step (sqlite3_recover_step()) of work for the connection
|
|
** passed as the only argument, which is guaranteed to be in
|
|
** RECOVER_STATE_LOSTANDFOUND3 state - during which the lost-and-found
|
|
** table of the output database is populated with recovered data that can
|
|
** not be assigned to any recovered schema object.
|
|
*/
|
|
static int recoverLostAndFound3Step(sqlite3_recover *p){
|
|
RecoverStateLAF *pLaf = &p->laf;
|
|
if( p->errCode==SQLITE_OK ){
|
|
if( pLaf->pInsert==0 ){
|
|
return SQLITE_DONE;
|
|
}else{
|
|
if( p->errCode==SQLITE_OK ){
|
|
int res = sqlite3_step(pLaf->pAllPage);
|
|
if( res==SQLITE_ROW ){
|
|
i64 iPage = sqlite3_column_int64(pLaf->pAllPage, 0);
|
|
if( recoverBitmapQuery(pLaf->pUsed, iPage)==0 ){
|
|
recoverLostAndFoundOnePage(p, iPage);
|
|
}
|
|
}else{
|
|
recoverReset(p, pLaf->pAllPage);
|
|
return SQLITE_DONE;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return SQLITE_OK;
|
|
}
|
|
|
|
/*
|
|
** Initialize resources required in RECOVER_STATE_LOSTANDFOUND3
|
|
** state - during which the lost-and-found table of the output database
|
|
** is populated with recovered data that can not be assigned to any
|
|
** recovered schema object.
|
|
*/
|
|
static void recoverLostAndFound3Init(sqlite3_recover *p){
|
|
RecoverStateLAF *pLaf = &p->laf;
|
|
|
|
if( pLaf->nMaxField>0 ){
|
|
char *zTab = 0; /* Name of lost_and_found table */
|
|
|
|
zTab = recoverLostAndFoundCreate(p, pLaf->nMaxField);
|
|
pLaf->pInsert = recoverLostAndFoundInsert(p, zTab, pLaf->nMaxField);
|
|
sqlite3_free(zTab);
|
|
|
|
pLaf->pAllPage = recoverPreparePrintf(p, p->dbOut,
|
|
"WITH RECURSIVE seq(ii) AS ("
|
|
" SELECT 1 UNION ALL SELECT ii+1 FROM seq WHERE ii<%lld"
|
|
")"
|
|
"SELECT ii FROM seq" , p->laf.nPg
|
|
);
|
|
pLaf->pPageData = recoverPrepare(p, p->dbOut,
|
|
"SELECT cell, field, value "
|
|
"FROM sqlite_dbdata('getpage()') d WHERE d.pgno=? "
|
|
"UNION ALL "
|
|
"SELECT -1, -1, -1"
|
|
);
|
|
|
|
pLaf->apVal = (sqlite3_value**)recoverMalloc(p,
|
|
pLaf->nMaxField*sizeof(sqlite3_value*)
|
|
);
|
|
}
|
|
}
|
|
|
|
/*
|
|
** Initialize resources required in RECOVER_STATE_WRITING state - during which
|
|
** tables recovered from the schema of the input database are populated with
|
|
** recovered data.
|
|
*/
|
|
static int recoverWriteDataInit(sqlite3_recover *p){
|
|
RecoverStateW1 *p1 = &p->w1;
|
|
RecoverTable *pTbl = 0;
|
|
int nByte = 0;
|
|
|
|
/* Figure out the maximum number of columns for any table in the schema */
|
|
assert( p1->nMax==0 );
|
|
for(pTbl=p->pTblList; pTbl; pTbl=pTbl->pNext){
|
|
if( pTbl->nCol>p1->nMax ) p1->nMax = pTbl->nCol;
|
|
}
|
|
|
|
/* Allocate an array of (sqlite3_value*) in which to accumulate the values
|
|
** that will be written to the output database in a single row. */
|
|
nByte = sizeof(sqlite3_value*) * (p1->nMax+1);
|
|
p1->apVal = (sqlite3_value**)recoverMalloc(p, nByte);
|
|
if( p1->apVal==0 ) return p->errCode;
|
|
|
|
/* Prepare the SELECT to loop through schema tables (pTbls) and the SELECT
|
|
** to loop through cells that appear to belong to a single table (pSel). */
|
|
p1->pTbls = recoverPrepare(p, p->dbOut,
|
|
"SELECT rootpage FROM recovery.schema "
|
|
" WHERE type='table' AND (sql NOT LIKE 'create virtual%')"
|
|
" ORDER BY (tbl_name='sqlite_sequence') ASC"
|
|
);
|
|
p1->pSel = recoverPrepare(p, p->dbOut,
|
|
"WITH RECURSIVE pages(page) AS ("
|
|
" SELECT ?1"
|
|
" UNION"
|
|
" SELECT child FROM sqlite_dbptr('getpage()'), pages "
|
|
" WHERE pgno=page"
|
|
") "
|
|
"SELECT page, cell, field, value "
|
|
"FROM sqlite_dbdata('getpage()') d, pages p WHERE p.page=d.pgno "
|
|
"UNION ALL "
|
|
"SELECT 0, 0, 0, 0"
|
|
);
|
|
|
|
return p->errCode;
|
|
}
|
|
|
|
/*
|
|
** Clean up resources allocated by recoverWriteDataInit() (stuff in
|
|
** sqlite3_recover.w1).
|
|
*/
|
|
static void recoverWriteDataCleanup(sqlite3_recover *p){
|
|
RecoverStateW1 *p1 = &p->w1;
|
|
int ii;
|
|
for(ii=0; ii<p1->nVal; ii++){
|
|
sqlite3_value_free(p1->apVal[ii]);
|
|
}
|
|
sqlite3_free(p1->apVal);
|
|
recoverFinalize(p, p1->pInsert);
|
|
recoverFinalize(p, p1->pTbls);
|
|
recoverFinalize(p, p1->pSel);
|
|
memset(p1, 0, sizeof(*p1));
|
|
}
|
|
|
|
/*
|
|
** Perform one step (sqlite3_recover_step()) of work for the connection
|
|
** passed as the only argument, which is guaranteed to be in
|
|
** RECOVER_STATE_WRITING state - during which tables recovered from the
|
|
** schema of the input database are populated with recovered data.
|
|
*/
|
|
static int recoverWriteDataStep(sqlite3_recover *p){
|
|
RecoverStateW1 *p1 = &p->w1;
|
|
sqlite3_stmt *pSel = p1->pSel;
|
|
sqlite3_value **apVal = p1->apVal;
|
|
|
|
if( p->errCode==SQLITE_OK && p1->pTab==0 ){
|
|
if( sqlite3_step(p1->pTbls)==SQLITE_ROW ){
|
|
i64 iRoot = sqlite3_column_int64(p1->pTbls, 0);
|
|
p1->pTab = recoverFindTable(p, iRoot);
|
|
|
|
recoverFinalize(p, p1->pInsert);
|
|
p1->pInsert = 0;
|
|
|
|
/* If this table is unknown, return early. The caller will invoke this
|
|
** function again and it will move on to the next table. */
|
|
if( p1->pTab==0 ) return p->errCode;
|
|
|
|
/* If this is the sqlite_sequence table, delete any rows added by
|
|
** earlier INSERT statements on tables with AUTOINCREMENT primary
|
|
** keys before recovering its contents. The p1->pTbls SELECT statement
|
|
** is rigged to deliver "sqlite_sequence" last of all, so we don't
|
|
** worry about it being modified after it is recovered. */
|
|
if( sqlite3_stricmp("sqlite_sequence", p1->pTab->zTab)==0 ){
|
|
recoverExec(p, p->dbOut, "DELETE FROM sqlite_sequence");
|
|
recoverSqlCallback(p, "DELETE FROM sqlite_sequence");
|
|
}
|
|
|
|
/* Bind the root page of this table within the original database to
|
|
** SELECT statement p1->pSel. The SELECT statement will then iterate
|
|
** through cells that look like they belong to table pTab. */
|
|
sqlite3_bind_int64(pSel, 1, iRoot);
|
|
|
|
p1->nVal = 0;
|
|
p1->bHaveRowid = 0;
|
|
p1->iPrevPage = -1;
|
|
p1->iPrevCell = -1;
|
|
}else{
|
|
return SQLITE_DONE;
|
|
}
|
|
}
|
|
assert( p->errCode!=SQLITE_OK || p1->pTab );
|
|
|
|
if( p->errCode==SQLITE_OK && sqlite3_step(pSel)==SQLITE_ROW ){
|
|
RecoverTable *pTab = p1->pTab;
|
|
|
|
i64 iPage = sqlite3_column_int64(pSel, 0);
|
|
int iCell = sqlite3_column_int(pSel, 1);
|
|
int iField = sqlite3_column_int(pSel, 2);
|
|
sqlite3_value *pVal = sqlite3_column_value(pSel, 3);
|
|
int bNewCell = (p1->iPrevPage!=iPage || p1->iPrevCell!=iCell);
|
|
|
|
assert( bNewCell==0 || (iField==-1 || iField==0) );
|
|
assert( bNewCell || iField==p1->nVal || p1->nVal==pTab->nCol );
|
|
|
|
if( bNewCell ){
|
|
int ii = 0;
|
|
if( p1->nVal>=0 ){
|
|
if( p1->pInsert==0 || p1->nVal!=p1->nInsert ){
|
|
recoverFinalize(p, p1->pInsert);
|
|
p1->pInsert = recoverInsertStmt(p, pTab, p1->nVal);
|
|
p1->nInsert = p1->nVal;
|
|
}
|
|
if( p1->nVal>0 ){
|
|
sqlite3_stmt *pInsert = p1->pInsert;
|
|
for(ii=0; ii<pTab->nCol; ii++){
|
|
RecoverColumn *pCol = &pTab->aCol[ii];
|
|
int iBind = pCol->iBind;
|
|
if( iBind>0 ){
|
|
if( pCol->bIPK ){
|
|
sqlite3_bind_int64(pInsert, iBind, p1->iRowid);
|
|
}else if( pCol->iField<p1->nVal ){
|
|
recoverBindValue(p, pInsert, iBind, apVal[pCol->iField]);
|
|
}
|
|
}
|
|
}
|
|
if( p->bRecoverRowid && pTab->iRowidBind>0 && p1->bHaveRowid ){
|
|
sqlite3_bind_int64(pInsert, pTab->iRowidBind, p1->iRowid);
|
|
}
|
|
if( SQLITE_ROW==sqlite3_step(pInsert) ){
|
|
const char *z = (const char*)sqlite3_column_text(pInsert, 0);
|
|
recoverSqlCallback(p, z);
|
|
}
|
|
recoverReset(p, pInsert);
|
|
assert( p->errCode || pInsert );
|
|
if( pInsert ) sqlite3_clear_bindings(pInsert);
|
|
}
|
|
}
|
|
|
|
for(ii=0; ii<p1->nVal; ii++){
|
|
sqlite3_value_free(apVal[ii]);
|
|
apVal[ii] = 0;
|
|
}
|
|
p1->nVal = -1;
|
|
p1->bHaveRowid = 0;
|
|
}
|
|
|
|
if( iPage!=0 ){
|
|
if( iField<0 ){
|
|
p1->iRowid = sqlite3_column_int64(pSel, 3);
|
|
assert( p1->nVal==-1 );
|
|
p1->nVal = 0;
|
|
p1->bHaveRowid = 1;
|
|
}else if( iField<pTab->nCol ){
|
|
assert( apVal[iField]==0 );
|
|
apVal[iField] = sqlite3_value_dup( pVal );
|
|
if( apVal[iField]==0 ){
|
|
recoverError(p, SQLITE_NOMEM, 0);
|
|
}
|
|
p1->nVal = iField+1;
|
|
}
|
|
p1->iPrevCell = iCell;
|
|
p1->iPrevPage = iPage;
|
|
}
|
|
}else{
|
|
recoverReset(p, pSel);
|
|
p1->pTab = 0;
|
|
}
|
|
|
|
return p->errCode;
|
|
}
|
|
|
|
/*
|
|
** Initialize resources required by sqlite3_recover_step() in
|
|
** RECOVER_STATE_LOSTANDFOUND1 state - during which the set of pages not
|
|
** already allocated to a recovered schema element is determined.
|
|
*/
|
|
static void recoverLostAndFound1Init(sqlite3_recover *p){
|
|
RecoverStateLAF *pLaf = &p->laf;
|
|
sqlite3_stmt *pStmt = 0;
|
|
|
|
assert( p->laf.pUsed==0 );
|
|
pLaf->nPg = recoverPageCount(p);
|
|
pLaf->pUsed = recoverBitmapAlloc(p, pLaf->nPg);
|
|
|
|
/* Prepare a statement to iterate through all pages that are part of any tree
|
|
** in the recoverable part of the input database schema to the bitmap. And,
|
|
** if !p->bFreelistCorrupt, add all pages that appear to be part of the
|
|
** freelist. */
|
|
pStmt = recoverPrepare(
|
|
p, p->dbOut,
|
|
"WITH trunk(pgno) AS ("
|
|
" SELECT read_i32(getpage(1), 8) AS x WHERE x>0"
|
|
" UNION"
|
|
" SELECT read_i32(getpage(trunk.pgno), 0) AS x FROM trunk WHERE x>0"
|
|
"),"
|
|
"trunkdata(pgno, data) AS ("
|
|
" SELECT pgno, getpage(pgno) FROM trunk"
|
|
"),"
|
|
"freelist(data, n, freepgno) AS ("
|
|
" SELECT data, min(16384, read_i32(data, 1)-1), pgno FROM trunkdata"
|
|
" UNION ALL"
|
|
" SELECT data, n-1, read_i32(data, 2+n) FROM freelist WHERE n>=0"
|
|
"),"
|
|
""
|
|
"roots(r) AS ("
|
|
" SELECT 1 UNION ALL"
|
|
" SELECT rootpage FROM recovery.schema WHERE rootpage>0"
|
|
"),"
|
|
"used(page) AS ("
|
|
" SELECT r FROM roots"
|
|
" UNION"
|
|
" SELECT child FROM sqlite_dbptr('getpage()'), used "
|
|
" WHERE pgno=page"
|
|
") "
|
|
"SELECT page FROM used"
|
|
" UNION ALL "
|
|
"SELECT freepgno FROM freelist WHERE NOT ?"
|
|
);
|
|
if( pStmt ) sqlite3_bind_int(pStmt, 1, p->bFreelistCorrupt);
|
|
pLaf->pUsedPages = pStmt;
|
|
}
|
|
|
|
/*
|
|
** Perform one step (sqlite3_recover_step()) of work for the connection
|
|
** passed as the only argument, which is guaranteed to be in
|
|
** RECOVER_STATE_LOSTANDFOUND1 state - during which the set of pages not
|
|
** already allocated to a recovered schema element is determined.
|
|
*/
|
|
static int recoverLostAndFound1Step(sqlite3_recover *p){
|
|
RecoverStateLAF *pLaf = &p->laf;
|
|
int rc = p->errCode;
|
|
if( rc==SQLITE_OK ){
|
|
rc = sqlite3_step(pLaf->pUsedPages);
|
|
if( rc==SQLITE_ROW ){
|
|
i64 iPg = sqlite3_column_int64(pLaf->pUsedPages, 0);
|
|
recoverBitmapSet(pLaf->pUsed, iPg);
|
|
rc = SQLITE_OK;
|
|
}else{
|
|
recoverFinalize(p, pLaf->pUsedPages);
|
|
pLaf->pUsedPages = 0;
|
|
}
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
** Initialize resources required by RECOVER_STATE_LOSTANDFOUND2
|
|
** state - during which the pages identified in RECOVER_STATE_LOSTANDFOUND1
|
|
** are sorted into sets that likely belonged to the same database tree.
|
|
*/
|
|
static void recoverLostAndFound2Init(sqlite3_recover *p){
|
|
RecoverStateLAF *pLaf = &p->laf;
|
|
|
|
assert( p->laf.pAllAndParent==0 );
|
|
assert( p->laf.pMapInsert==0 );
|
|
assert( p->laf.pMaxField==0 );
|
|
assert( p->laf.nMaxField==0 );
|
|
|
|
pLaf->pMapInsert = recoverPrepare(p, p->dbOut,
|
|
"INSERT OR IGNORE INTO recovery.map(pgno, parent) VALUES(?, ?)"
|
|
);
|
|
pLaf->pAllAndParent = recoverPreparePrintf(p, p->dbOut,
|
|
"WITH RECURSIVE seq(ii) AS ("
|
|
" SELECT 1 UNION ALL SELECT ii+1 FROM seq WHERE ii<%lld"
|
|
")"
|
|
"SELECT pgno, child FROM sqlite_dbptr('getpage()') "
|
|
" UNION ALL "
|
|
"SELECT NULL, ii FROM seq", p->laf.nPg
|
|
);
|
|
pLaf->pMaxField = recoverPreparePrintf(p, p->dbOut,
|
|
"SELECT max(field)+1 FROM sqlite_dbdata('getpage') WHERE pgno = ?"
|
|
);
|
|
}
|
|
|
|
/*
|
|
** Perform one step (sqlite3_recover_step()) of work for the connection
|
|
** passed as the only argument, which is guaranteed to be in
|
|
** RECOVER_STATE_LOSTANDFOUND2 state - during which the pages identified
|
|
** in RECOVER_STATE_LOSTANDFOUND1 are sorted into sets that likely belonged
|
|
** to the same database tree.
|
|
*/
|
|
static int recoverLostAndFound2Step(sqlite3_recover *p){
|
|
RecoverStateLAF *pLaf = &p->laf;
|
|
if( p->errCode==SQLITE_OK ){
|
|
int res = sqlite3_step(pLaf->pAllAndParent);
|
|
if( res==SQLITE_ROW ){
|
|
i64 iChild = sqlite3_column_int(pLaf->pAllAndParent, 1);
|
|
if( recoverBitmapQuery(pLaf->pUsed, iChild)==0 ){
|
|
sqlite3_bind_int64(pLaf->pMapInsert, 1, iChild);
|
|
sqlite3_bind_value(pLaf->pMapInsert, 2,
|
|
sqlite3_column_value(pLaf->pAllAndParent, 0)
|
|
);
|
|
sqlite3_step(pLaf->pMapInsert);
|
|
recoverReset(p, pLaf->pMapInsert);
|
|
sqlite3_bind_int64(pLaf->pMaxField, 1, iChild);
|
|
if( SQLITE_ROW==sqlite3_step(pLaf->pMaxField) ){
|
|
int nMax = sqlite3_column_int(pLaf->pMaxField, 0);
|
|
if( nMax>pLaf->nMaxField ) pLaf->nMaxField = nMax;
|
|
}
|
|
recoverReset(p, pLaf->pMaxField);
|
|
}
|
|
}else{
|
|
recoverFinalize(p, pLaf->pAllAndParent);
|
|
pLaf->pAllAndParent =0;
|
|
return SQLITE_DONE;
|
|
}
|
|
}
|
|
return p->errCode;
|
|
}
|
|
|
|
/*
|
|
** Free all resources allocated as part of sqlite3_recover_step() calls
|
|
** in one of the RECOVER_STATE_LOSTANDFOUND[123] states.
|
|
*/
|
|
static void recoverLostAndFoundCleanup(sqlite3_recover *p){
|
|
recoverBitmapFree(p->laf.pUsed);
|
|
p->laf.pUsed = 0;
|
|
sqlite3_finalize(p->laf.pUsedPages);
|
|
sqlite3_finalize(p->laf.pAllAndParent);
|
|
sqlite3_finalize(p->laf.pMapInsert);
|
|
sqlite3_finalize(p->laf.pMaxField);
|
|
sqlite3_finalize(p->laf.pFindRoot);
|
|
sqlite3_finalize(p->laf.pInsert);
|
|
sqlite3_finalize(p->laf.pAllPage);
|
|
sqlite3_finalize(p->laf.pPageData);
|
|
p->laf.pUsedPages = 0;
|
|
p->laf.pAllAndParent = 0;
|
|
p->laf.pMapInsert = 0;
|
|
p->laf.pMaxField = 0;
|
|
p->laf.pFindRoot = 0;
|
|
p->laf.pInsert = 0;
|
|
p->laf.pAllPage = 0;
|
|
p->laf.pPageData = 0;
|
|
sqlite3_free(p->laf.apVal);
|
|
p->laf.apVal = 0;
|
|
}
|
|
|
|
/*
|
|
** Free all resources allocated as part of sqlite3_recover_step() calls.
|
|
*/
|
|
static void recoverFinalCleanup(sqlite3_recover *p){
|
|
RecoverTable *pTab = 0;
|
|
RecoverTable *pNext = 0;
|
|
|
|
recoverWriteDataCleanup(p);
|
|
recoverLostAndFoundCleanup(p);
|
|
|
|
for(pTab=p->pTblList; pTab; pTab=pNext){
|
|
pNext = pTab->pNext;
|
|
sqlite3_free(pTab);
|
|
}
|
|
p->pTblList = 0;
|
|
sqlite3_finalize(p->pGetPage);
|
|
p->pGetPage = 0;
|
|
sqlite3_file_control(p->dbIn, p->zDb, SQLITE_FCNTL_RESET_CACHE, 0);
|
|
|
|
{
|
|
#ifndef NDEBUG
|
|
int res =
|
|
#endif
|
|
sqlite3_close(p->dbOut);
|
|
assert( res==SQLITE_OK );
|
|
}
|
|
p->dbOut = 0;
|
|
}
|
|
|
|
/*
|
|
** Decode and return an unsigned 16-bit big-endian integer value from
|
|
** buffer a[].
|
|
*/
|
|
static u32 recoverGetU16(const u8 *a){
|
|
return (((u32)a[0])<<8) + ((u32)a[1]);
|
|
}
|
|
|
|
/*
|
|
** Decode and return an unsigned 32-bit big-endian integer value from
|
|
** buffer a[].
|
|
*/
|
|
static u32 recoverGetU32(const u8 *a){
|
|
return (((u32)a[0])<<24) + (((u32)a[1])<<16) + (((u32)a[2])<<8) + ((u32)a[3]);
|
|
}
|
|
|
|
/*
|
|
** Decode an SQLite varint from buffer a[]. Write the decoded value to (*pVal)
|
|
** and return the number of bytes consumed.
|
|
*/
|
|
static int recoverGetVarint(const u8 *a, i64 *pVal){
|
|
sqlite3_uint64 u = 0;
|
|
int i;
|
|
for(i=0; i<8; i++){
|
|
u = (u<<7) + (a[i]&0x7f);
|
|
if( (a[i]&0x80)==0 ){ *pVal = (sqlite3_int64)u; return i+1; }
|
|
}
|
|
u = (u<<8) + (a[i]&0xff);
|
|
*pVal = (sqlite3_int64)u;
|
|
return 9;
|
|
}
|
|
|
|
/*
|
|
** The second argument points to a buffer n bytes in size. If this buffer
|
|
** or a prefix thereof appears to contain a well-formed SQLite b-tree page,
|
|
** return the page-size in bytes. Otherwise, if the buffer does not
|
|
** appear to contain a well-formed b-tree page, return 0.
|
|
*/
|
|
static int recoverIsValidPage(u8 *aTmp, const u8 *a, int n){
|
|
u8 *aUsed = aTmp;
|
|
int nFrag = 0;
|
|
int nActual = 0;
|
|
int iFree = 0;
|
|
int nCell = 0; /* Number of cells on page */
|
|
int iCellOff = 0; /* Offset of cell array in page */
|
|
int iContent = 0;
|
|
int eType = 0;
|
|
int ii = 0;
|
|
|
|
eType = (int)a[0];
|
|
if( eType!=0x02 && eType!=0x05 && eType!=0x0A && eType!=0x0D ) return 0;
|
|
|
|
iFree = (int)recoverGetU16(&a[1]);
|
|
nCell = (int)recoverGetU16(&a[3]);
|
|
iContent = (int)recoverGetU16(&a[5]);
|
|
if( iContent==0 ) iContent = 65536;
|
|
nFrag = (int)a[7];
|
|
|
|
if( iContent>n ) return 0;
|
|
|
|
memset(aUsed, 0, n);
|
|
memset(aUsed, 0xFF, iContent);
|
|
|
|
/* Follow the free-list. This is the same format for all b-tree pages. */
|
|
if( iFree && iFree<=iContent ) return 0;
|
|
while( iFree ){
|
|
int iNext = 0;
|
|
int nByte = 0;
|
|
if( iFree>(n-4) ) return 0;
|
|
iNext = recoverGetU16(&a[iFree]);
|
|
nByte = recoverGetU16(&a[iFree+2]);
|
|
if( iFree+nByte>n || nByte<4 ) return 0;
|
|
if( iNext && iNext<iFree+nByte ) return 0;
|
|
memset(&aUsed[iFree], 0xFF, nByte);
|
|
iFree = iNext;
|
|
}
|
|
|
|
/* Run through the cells */
|
|
if( eType==0x02 || eType==0x05 ){
|
|
iCellOff = 12;
|
|
}else{
|
|
iCellOff = 8;
|
|
}
|
|
if( (iCellOff + 2*nCell)>iContent ) return 0;
|
|
for(ii=0; ii<nCell; ii++){
|
|
int iByte;
|
|
i64 nPayload = 0;
|
|
int nByte = 0;
|
|
int iOff = recoverGetU16(&a[iCellOff + 2*ii]);
|
|
if( iOff<iContent || iOff>n ){
|
|
return 0;
|
|
}
|
|
if( eType==0x05 || eType==0x02 ) nByte += 4;
|
|
nByte += recoverGetVarint(&a[iOff+nByte], &nPayload);
|
|
if( eType==0x0D ){
|
|
i64 dummy = 0;
|
|
nByte += recoverGetVarint(&a[iOff+nByte], &dummy);
|
|
}
|
|
if( eType!=0x05 ){
|
|
int X = (eType==0x0D) ? n-35 : (((n-12)*64/255)-23);
|
|
int M = ((n-12)*32/255)-23;
|
|
int K = M+((nPayload-M)%(n-4));
|
|
|
|
if( nPayload<X ){
|
|
nByte += nPayload;
|
|
}else if( K<=X ){
|
|
nByte += K+4;
|
|
}else{
|
|
nByte += M+4;
|
|
}
|
|
}
|
|
|
|
if( iOff+nByte>n ){
|
|
return 0;
|
|
}
|
|
for(iByte=iOff; iByte<(iOff+nByte); iByte++){
|
|
if( aUsed[iByte]!=0 ){
|
|
return 0;
|
|
}
|
|
aUsed[iByte] = 0xFF;
|
|
}
|
|
}
|
|
|
|
nActual = 0;
|
|
for(ii=0; ii<n; ii++){
|
|
if( aUsed[ii]==0 ) nActual++;
|
|
}
|
|
return (nActual==nFrag);
|
|
}
|
|
|
|
|
|
static int recoverVfsClose(sqlite3_file*);
|
|
static int recoverVfsRead(sqlite3_file*, void*, int iAmt, sqlite3_int64 iOfst);
|
|
static int recoverVfsWrite(sqlite3_file*, const void*, int, sqlite3_int64);
|
|
static int recoverVfsTruncate(sqlite3_file*, sqlite3_int64 size);
|
|
static int recoverVfsSync(sqlite3_file*, int flags);
|
|
static int recoverVfsFileSize(sqlite3_file*, sqlite3_int64 *pSize);
|
|
static int recoverVfsLock(sqlite3_file*, int);
|
|
static int recoverVfsUnlock(sqlite3_file*, int);
|
|
static int recoverVfsCheckReservedLock(sqlite3_file*, int *pResOut);
|
|
static int recoverVfsFileControl(sqlite3_file*, int op, void *pArg);
|
|
static int recoverVfsSectorSize(sqlite3_file*);
|
|
static int recoverVfsDeviceCharacteristics(sqlite3_file*);
|
|
static int recoverVfsShmMap(sqlite3_file*, int, int, int, void volatile**);
|
|
static int recoverVfsShmLock(sqlite3_file*, int offset, int n, int flags);
|
|
static void recoverVfsShmBarrier(sqlite3_file*);
|
|
static int recoverVfsShmUnmap(sqlite3_file*, int deleteFlag);
|
|
static int recoverVfsFetch(sqlite3_file*, sqlite3_int64, int, void**);
|
|
static int recoverVfsUnfetch(sqlite3_file *pFd, sqlite3_int64 iOff, void *p);
|
|
|
|
static sqlite3_io_methods recover_methods = {
|
|
2, /* iVersion */
|
|
recoverVfsClose,
|
|
recoverVfsRead,
|
|
recoverVfsWrite,
|
|
recoverVfsTruncate,
|
|
recoverVfsSync,
|
|
recoverVfsFileSize,
|
|
recoverVfsLock,
|
|
recoverVfsUnlock,
|
|
recoverVfsCheckReservedLock,
|
|
recoverVfsFileControl,
|
|
recoverVfsSectorSize,
|
|
recoverVfsDeviceCharacteristics,
|
|
recoverVfsShmMap,
|
|
recoverVfsShmLock,
|
|
recoverVfsShmBarrier,
|
|
recoverVfsShmUnmap,
|
|
recoverVfsFetch,
|
|
recoverVfsUnfetch
|
|
};
|
|
|
|
static int recoverVfsClose(sqlite3_file *pFd){
|
|
assert( pFd->pMethods!=&recover_methods );
|
|
return pFd->pMethods->xClose(pFd);
|
|
}
|
|
|
|
/*
|
|
** Write value v to buffer a[] as a 16-bit big-endian unsigned integer.
|
|
*/
|
|
static void recoverPutU16(u8 *a, u32 v){
|
|
a[0] = (v>>8) & 0x00FF;
|
|
a[1] = (v>>0) & 0x00FF;
|
|
}
|
|
|
|
/*
|
|
** Write value v to buffer a[] as a 32-bit big-endian unsigned integer.
|
|
*/
|
|
static void recoverPutU32(u8 *a, u32 v){
|
|
a[0] = (v>>24) & 0x00FF;
|
|
a[1] = (v>>16) & 0x00FF;
|
|
a[2] = (v>>8) & 0x00FF;
|
|
a[3] = (v>>0) & 0x00FF;
|
|
}
|
|
|
|
/*
|
|
** Detect the page-size of the database opened by file-handle pFd by
|
|
** searching the first part of the file for a well-formed SQLite b-tree
|
|
** page. If parameter nReserve is non-zero, then as well as searching for
|
|
** a b-tree page with zero reserved bytes, this function searches for one
|
|
** with nReserve reserved bytes at the end of it.
|
|
**
|
|
** If successful, set variable p->detected_pgsz to the detected page-size
|
|
** in bytes and return SQLITE_OK. Or, if no error occurs but no valid page
|
|
** can be found, return SQLITE_OK but leave p->detected_pgsz set to 0. Or,
|
|
** if an error occurs (e.g. an IO or OOM error), then an SQLite error code
|
|
** is returned. The final value of p->detected_pgsz is undefined in this
|
|
** case.
|
|
*/
|
|
static int recoverVfsDetectPagesize(
|
|
sqlite3_recover *p, /* Recover handle */
|
|
sqlite3_file *pFd, /* File-handle open on input database */
|
|
u32 nReserve, /* Possible nReserve value */
|
|
i64 nSz /* Size of database file in bytes */
|
|
){
|
|
int rc = SQLITE_OK;
|
|
const int nMin = 512;
|
|
const int nMax = 65536;
|
|
const int nMaxBlk = 4;
|
|
u32 pgsz = 0;
|
|
int iBlk = 0;
|
|
u8 *aPg = 0;
|
|
u8 *aTmp = 0;
|
|
int nBlk = 0;
|
|
|
|
aPg = (u8*)sqlite3_malloc(2*nMax);
|
|
if( aPg==0 ) return SQLITE_NOMEM;
|
|
aTmp = &aPg[nMax];
|
|
|
|
nBlk = (nSz+nMax-1)/nMax;
|
|
if( nBlk>nMaxBlk ) nBlk = nMaxBlk;
|
|
|
|
do {
|
|
for(iBlk=0; rc==SQLITE_OK && iBlk<nBlk; iBlk++){
|
|
int nByte = (nSz>=((iBlk+1)*nMax)) ? nMax : (nSz % nMax);
|
|
memset(aPg, 0, nMax);
|
|
rc = pFd->pMethods->xRead(pFd, aPg, nByte, iBlk*nMax);
|
|
if( rc==SQLITE_OK ){
|
|
int pgsz2;
|
|
for(pgsz2=(pgsz ? pgsz*2 : nMin); pgsz2<=nMax; pgsz2=pgsz2*2){
|
|
int iOff;
|
|
for(iOff=0; iOff<nMax; iOff+=pgsz2){
|
|
if( recoverIsValidPage(aTmp, &aPg[iOff], pgsz2-nReserve) ){
|
|
pgsz = pgsz2;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if( pgsz>(u32)p->detected_pgsz ){
|
|
p->detected_pgsz = pgsz;
|
|
p->nReserve = nReserve;
|
|
}
|
|
if( nReserve==0 ) break;
|
|
nReserve = 0;
|
|
}while( 1 );
|
|
|
|
p->detected_pgsz = pgsz;
|
|
sqlite3_free(aPg);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
** The xRead() method of the wrapper VFS. This is used to intercept calls
|
|
** to read page 1 of the input database.
|
|
*/
|
|
static int recoverVfsRead(sqlite3_file *pFd, void *aBuf, int nByte, i64 iOff){
|
|
int rc = SQLITE_OK;
|
|
if( pFd->pMethods==&recover_methods ){
|
|
pFd->pMethods = recover_g.pMethods;
|
|
rc = pFd->pMethods->xRead(pFd, aBuf, nByte, iOff);
|
|
if( nByte==16 ){
|
|
sqlite3_randomness(16, aBuf);
|
|
}else
|
|
if( rc==SQLITE_OK && iOff==0 && nByte>=108 ){
|
|
/* Ensure that the database has a valid header file. The only fields
|
|
** that really matter to recovery are:
|
|
**
|
|
** + Database page size (16-bits at offset 16)
|
|
** + Size of db in pages (32-bits at offset 28)
|
|
** + Database encoding (32-bits at offset 56)
|
|
**
|
|
** Also preserved are:
|
|
**
|
|
** + first freelist page (32-bits at offset 32)
|
|
** + size of freelist (32-bits at offset 36)
|
|
** + the wal-mode flags (16-bits at offset 18)
|
|
**
|
|
** We also try to preserve the auto-vacuum, incr-value, user-version
|
|
** and application-id fields - all 32 bit quantities at offsets
|
|
** 52, 60, 64 and 68. All other fields are set to known good values.
|
|
**
|
|
** Byte offset 105 should also contain the page-size as a 16-bit
|
|
** integer.
|
|
*/
|
|
const int aPreserve[] = {32, 36, 52, 60, 64, 68};
|
|
u8 aHdr[108] = {
|
|
0x53, 0x51, 0x4c, 0x69, 0x74, 0x65, 0x20, 0x66,
|
|
0x6f, 0x72, 0x6d, 0x61, 0x74, 0x20, 0x33, 0x00,
|
|
0xFF, 0xFF, 0x01, 0x01, 0x00, 0x40, 0x20, 0x20,
|
|
0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF,
|
|
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04,
|
|
0x00, 0x00, 0x10, 0x00, 0xFF, 0xFF, 0xFF, 0xFF,
|
|
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
|
|
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x00, 0x2e, 0x5b, 0x30,
|
|
|
|
0x0D, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0x00
|
|
};
|
|
u8 *a = (u8*)aBuf;
|
|
|
|
u32 pgsz = recoverGetU16(&a[16]);
|
|
u32 nReserve = a[20];
|
|
u32 enc = recoverGetU32(&a[56]);
|
|
u32 dbsz = 0;
|
|
i64 dbFileSize = 0;
|
|
int ii;
|
|
sqlite3_recover *p = recover_g.p;
|
|
|
|
if( pgsz==0x01 ) pgsz = 65536;
|
|
rc = pFd->pMethods->xFileSize(pFd, &dbFileSize);
|
|
|
|
if( rc==SQLITE_OK && p->detected_pgsz==0 ){
|
|
rc = recoverVfsDetectPagesize(p, pFd, nReserve, dbFileSize);
|
|
}
|
|
if( p->detected_pgsz ){
|
|
pgsz = p->detected_pgsz;
|
|
nReserve = p->nReserve;
|
|
}
|
|
|
|
if( pgsz ){
|
|
dbsz = dbFileSize / pgsz;
|
|
}
|
|
if( enc!=SQLITE_UTF8 && enc!=SQLITE_UTF16BE && enc!=SQLITE_UTF16LE ){
|
|
enc = SQLITE_UTF8;
|
|
}
|
|
|
|
sqlite3_free(p->pPage1Cache);
|
|
p->pPage1Cache = 0;
|
|
p->pPage1Disk = 0;
|
|
|
|
p->pgsz = nByte;
|
|
p->pPage1Cache = (u8*)recoverMalloc(p, nByte*2);
|
|
if( p->pPage1Cache ){
|
|
p->pPage1Disk = &p->pPage1Cache[nByte];
|
|
memcpy(p->pPage1Disk, aBuf, nByte);
|
|
aHdr[18] = a[18];
|
|
aHdr[19] = a[19];
|
|
recoverPutU32(&aHdr[28], dbsz);
|
|
recoverPutU32(&aHdr[56], enc);
|
|
recoverPutU16(&aHdr[105], pgsz-nReserve);
|
|
if( pgsz==65536 ) pgsz = 1;
|
|
recoverPutU16(&aHdr[16], pgsz);
|
|
aHdr[20] = nReserve;
|
|
for(ii=0; ii<(int)(sizeof(aPreserve)/sizeof(aPreserve[0])); ii++){
|
|
memcpy(&aHdr[aPreserve[ii]], &a[aPreserve[ii]], 4);
|
|
}
|
|
memcpy(aBuf, aHdr, sizeof(aHdr));
|
|
memset(&((u8*)aBuf)[sizeof(aHdr)], 0, nByte-sizeof(aHdr));
|
|
|
|
memcpy(p->pPage1Cache, aBuf, nByte);
|
|
}else{
|
|
rc = p->errCode;
|
|
}
|
|
|
|
}
|
|
pFd->pMethods = &recover_methods;
|
|
}else{
|
|
rc = pFd->pMethods->xRead(pFd, aBuf, nByte, iOff);
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
** Used to make sqlite3_io_methods wrapper methods less verbose.
|
|
*/
|
|
#define RECOVER_VFS_WRAPPER(code) \
|
|
int rc = SQLITE_OK; \
|
|
if( pFd->pMethods==&recover_methods ){ \
|
|
pFd->pMethods = recover_g.pMethods; \
|
|
rc = code; \
|
|
pFd->pMethods = &recover_methods; \
|
|
}else{ \
|
|
rc = code; \
|
|
} \
|
|
return rc;
|
|
|
|
/*
|
|
** Methods of the wrapper VFS. All methods except for xRead() and xClose()
|
|
** simply uninstall the sqlite3_io_methods wrapper, invoke the equivalent
|
|
** method on the lower level VFS, then reinstall the wrapper before returning.
|
|
** Those that return an integer value use the RECOVER_VFS_WRAPPER macro.
|
|
*/
|
|
static int recoverVfsWrite(
|
|
sqlite3_file *pFd, const void *aBuf, int nByte, i64 iOff
|
|
){
|
|
RECOVER_VFS_WRAPPER (
|
|
pFd->pMethods->xWrite(pFd, aBuf, nByte, iOff)
|
|
);
|
|
}
|
|
static int recoverVfsTruncate(sqlite3_file *pFd, sqlite3_int64 size){
|
|
RECOVER_VFS_WRAPPER (
|
|
pFd->pMethods->xTruncate(pFd, size)
|
|
);
|
|
}
|
|
static int recoverVfsSync(sqlite3_file *pFd, int flags){
|
|
RECOVER_VFS_WRAPPER (
|
|
pFd->pMethods->xSync(pFd, flags)
|
|
);
|
|
}
|
|
static int recoverVfsFileSize(sqlite3_file *pFd, sqlite3_int64 *pSize){
|
|
RECOVER_VFS_WRAPPER (
|
|
pFd->pMethods->xFileSize(pFd, pSize)
|
|
);
|
|
}
|
|
static int recoverVfsLock(sqlite3_file *pFd, int eLock){
|
|
RECOVER_VFS_WRAPPER (
|
|
pFd->pMethods->xLock(pFd, eLock)
|
|
);
|
|
}
|
|
static int recoverVfsUnlock(sqlite3_file *pFd, int eLock){
|
|
RECOVER_VFS_WRAPPER (
|
|
pFd->pMethods->xUnlock(pFd, eLock)
|
|
);
|
|
}
|
|
static int recoverVfsCheckReservedLock(sqlite3_file *pFd, int *pResOut){
|
|
RECOVER_VFS_WRAPPER (
|
|
pFd->pMethods->xCheckReservedLock(pFd, pResOut)
|
|
);
|
|
}
|
|
static int recoverVfsFileControl(sqlite3_file *pFd, int op, void *pArg){
|
|
RECOVER_VFS_WRAPPER (
|
|
(pFd->pMethods ? pFd->pMethods->xFileControl(pFd, op, pArg) : SQLITE_NOTFOUND)
|
|
);
|
|
}
|
|
static int recoverVfsSectorSize(sqlite3_file *pFd){
|
|
RECOVER_VFS_WRAPPER (
|
|
pFd->pMethods->xSectorSize(pFd)
|
|
);
|
|
}
|
|
static int recoverVfsDeviceCharacteristics(sqlite3_file *pFd){
|
|
RECOVER_VFS_WRAPPER (
|
|
pFd->pMethods->xDeviceCharacteristics(pFd)
|
|
);
|
|
}
|
|
static int recoverVfsShmMap(
|
|
sqlite3_file *pFd, int iPg, int pgsz, int bExtend, void volatile **pp
|
|
){
|
|
RECOVER_VFS_WRAPPER (
|
|
pFd->pMethods->xShmMap(pFd, iPg, pgsz, bExtend, pp)
|
|
);
|
|
}
|
|
static int recoverVfsShmLock(sqlite3_file *pFd, int offset, int n, int flags){
|
|
RECOVER_VFS_WRAPPER (
|
|
pFd->pMethods->xShmLock(pFd, offset, n, flags)
|
|
);
|
|
}
|
|
static void recoverVfsShmBarrier(sqlite3_file *pFd){
|
|
if( pFd->pMethods==&recover_methods ){
|
|
pFd->pMethods = recover_g.pMethods;
|
|
pFd->pMethods->xShmBarrier(pFd);
|
|
pFd->pMethods = &recover_methods;
|
|
}else{
|
|
pFd->pMethods->xShmBarrier(pFd);
|
|
}
|
|
}
|
|
static int recoverVfsShmUnmap(sqlite3_file *pFd, int deleteFlag){
|
|
RECOVER_VFS_WRAPPER (
|
|
pFd->pMethods->xShmUnmap(pFd, deleteFlag)
|
|
);
|
|
}
|
|
|
|
static int recoverVfsFetch(
|
|
sqlite3_file *pFd,
|
|
sqlite3_int64 iOff,
|
|
int iAmt,
|
|
void **pp
|
|
){
|
|
(void)pFd;
|
|
(void)iOff;
|
|
(void)iAmt;
|
|
*pp = 0;
|
|
return SQLITE_OK;
|
|
}
|
|
static int recoverVfsUnfetch(sqlite3_file *pFd, sqlite3_int64 iOff, void *p){
|
|
(void)pFd;
|
|
(void)iOff;
|
|
(void)p;
|
|
return SQLITE_OK;
|
|
}
|
|
|
|
/*
|
|
** Install the VFS wrapper around the file-descriptor open on the input
|
|
** database for recover handle p. Mutex RECOVER_MUTEX_ID must be held
|
|
** when this function is called.
|
|
*/
|
|
static void recoverInstallWrapper(sqlite3_recover *p){
|
|
sqlite3_file *pFd = 0;
|
|
assert( recover_g.pMethods==0 );
|
|
recoverAssertMutexHeld();
|
|
sqlite3_file_control(p->dbIn, p->zDb, SQLITE_FCNTL_FILE_POINTER, (void*)&pFd);
|
|
assert( pFd==0 || pFd->pMethods!=&recover_methods );
|
|
if( pFd && pFd->pMethods ){
|
|
int iVersion = 1 + (pFd->pMethods->iVersion>1 && pFd->pMethods->xShmMap!=0);
|
|
recover_g.pMethods = pFd->pMethods;
|
|
recover_g.p = p;
|
|
recover_methods.iVersion = iVersion;
|
|
pFd->pMethods = &recover_methods;
|
|
}
|
|
}
|
|
|
|
/*
|
|
** Uninstall the VFS wrapper that was installed around the file-descriptor open
|
|
** on the input database for recover handle p. Mutex RECOVER_MUTEX_ID must be
|
|
** held when this function is called.
|
|
*/
|
|
static void recoverUninstallWrapper(sqlite3_recover *p){
|
|
sqlite3_file *pFd = 0;
|
|
recoverAssertMutexHeld();
|
|
sqlite3_file_control(p->dbIn, p->zDb,SQLITE_FCNTL_FILE_POINTER,(void*)&pFd);
|
|
if( pFd && pFd->pMethods ){
|
|
pFd->pMethods = recover_g.pMethods;
|
|
recover_g.pMethods = 0;
|
|
recover_g.p = 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
** This function does the work of a single sqlite3_recover_step() call. It
|
|
** is guaranteed that the handle is not in an error state when this
|
|
** function is called.
|
|
*/
|
|
static void recoverStep(sqlite3_recover *p){
|
|
assert( p && p->errCode==SQLITE_OK );
|
|
switch( p->eState ){
|
|
case RECOVER_STATE_INIT:
|
|
/* This is the very first call to sqlite3_recover_step() on this object.
|
|
*/
|
|
recoverSqlCallback(p, "BEGIN");
|
|
recoverSqlCallback(p, "PRAGMA writable_schema = on");
|
|
|
|
recoverEnterMutex();
|
|
recoverInstallWrapper(p);
|
|
|
|
/* Open the output database. And register required virtual tables and
|
|
** user functions with the new handle. */
|
|
recoverOpenOutput(p);
|
|
|
|
/* Open transactions on both the input and output databases. */
|
|
sqlite3_file_control(p->dbIn, p->zDb, SQLITE_FCNTL_RESET_CACHE, 0);
|
|
recoverExec(p, p->dbIn, "PRAGMA writable_schema = on");
|
|
recoverExec(p, p->dbIn, "BEGIN");
|
|
if( p->errCode==SQLITE_OK ) p->bCloseTransaction = 1;
|
|
recoverExec(p, p->dbIn, "SELECT 1 FROM sqlite_schema");
|
|
recoverTransferSettings(p);
|
|
recoverOpenRecovery(p);
|
|
recoverCacheSchema(p);
|
|
|
|
recoverUninstallWrapper(p);
|
|
recoverLeaveMutex();
|
|
|
|
recoverExec(p, p->dbOut, "BEGIN");
|
|
|
|
recoverWriteSchema1(p);
|
|
p->eState = RECOVER_STATE_WRITING;
|
|
break;
|
|
|
|
case RECOVER_STATE_WRITING: {
|
|
if( p->w1.pTbls==0 ){
|
|
recoverWriteDataInit(p);
|
|
}
|
|
if( SQLITE_DONE==recoverWriteDataStep(p) ){
|
|
recoverWriteDataCleanup(p);
|
|
if( p->zLostAndFound ){
|
|
p->eState = RECOVER_STATE_LOSTANDFOUND1;
|
|
}else{
|
|
p->eState = RECOVER_STATE_SCHEMA2;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
case RECOVER_STATE_LOSTANDFOUND1: {
|
|
if( p->laf.pUsed==0 ){
|
|
recoverLostAndFound1Init(p);
|
|
}
|
|
if( SQLITE_DONE==recoverLostAndFound1Step(p) ){
|
|
p->eState = RECOVER_STATE_LOSTANDFOUND2;
|
|
}
|
|
break;
|
|
}
|
|
case RECOVER_STATE_LOSTANDFOUND2: {
|
|
if( p->laf.pAllAndParent==0 ){
|
|
recoverLostAndFound2Init(p);
|
|
}
|
|
if( SQLITE_DONE==recoverLostAndFound2Step(p) ){
|
|
p->eState = RECOVER_STATE_LOSTANDFOUND3;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case RECOVER_STATE_LOSTANDFOUND3: {
|
|
if( p->laf.pInsert==0 ){
|
|
recoverLostAndFound3Init(p);
|
|
}
|
|
if( SQLITE_DONE==recoverLostAndFound3Step(p) ){
|
|
p->eState = RECOVER_STATE_SCHEMA2;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case RECOVER_STATE_SCHEMA2: {
|
|
int rc = SQLITE_OK;
|
|
|
|
recoverWriteSchema2(p);
|
|
p->eState = RECOVER_STATE_DONE;
|
|
|
|
/* If no error has occurred, commit the write transaction on the output
|
|
** database. Regardless of whether or not an error has occurred, make
|
|
** an attempt to end the read transaction on the input database. */
|
|
recoverExec(p, p->dbOut, "COMMIT");
|
|
rc = sqlite3_exec(p->dbIn, "END", 0, 0, 0);
|
|
if( p->errCode==SQLITE_OK ) p->errCode = rc;
|
|
|
|
recoverSqlCallback(p, "PRAGMA writable_schema = off");
|
|
recoverSqlCallback(p, "COMMIT");
|
|
p->eState = RECOVER_STATE_DONE;
|
|
recoverFinalCleanup(p);
|
|
break;
|
|
};
|
|
|
|
case RECOVER_STATE_DONE: {
|
|
/* no-op */
|
|
break;
|
|
};
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
** This is a worker function that does the heavy lifting for both init
|
|
** functions:
|
|
**
|
|
** sqlite3_recover_init()
|
|
** sqlite3_recover_init_sql()
|
|
**
|
|
** All this function does is allocate space for the recover handle and
|
|
** take copies of the input parameters. All the real work is done within
|
|
** sqlite3_recover_run().
|
|
*/
|
|
sqlite3_recover *recoverInit(
|
|
sqlite3* db,
|
|
const char *zDb,
|
|
const char *zUri, /* Output URI for _recover_init() */
|
|
int (*xSql)(void*, const char*),/* SQL callback for _recover_init_sql() */
|
|
void *pSqlCtx /* Context arg for _recover_init_sql() */
|
|
){
|
|
sqlite3_recover *pRet = 0;
|
|
int nDb = 0;
|
|
int nUri = 0;
|
|
int nByte = 0;
|
|
|
|
if( zDb==0 ){ zDb = "main"; }
|
|
|
|
nDb = recoverStrlen(zDb);
|
|
nUri = recoverStrlen(zUri);
|
|
|
|
nByte = sizeof(sqlite3_recover) + nDb+1 + nUri+1;
|
|
pRet = (sqlite3_recover*)sqlite3_malloc(nByte);
|
|
if( pRet ){
|
|
memset(pRet, 0, nByte);
|
|
pRet->dbIn = db;
|
|
pRet->zDb = (char*)&pRet[1];
|
|
pRet->zUri = &pRet->zDb[nDb+1];
|
|
memcpy(pRet->zDb, zDb, nDb);
|
|
if( nUri>0 && zUri ) memcpy(pRet->zUri, zUri, nUri);
|
|
pRet->xSql = xSql;
|
|
pRet->pSqlCtx = pSqlCtx;
|
|
pRet->bRecoverRowid = RECOVER_ROWID_DEFAULT;
|
|
}
|
|
|
|
return pRet;
|
|
}
|
|
|
|
/*
|
|
** Initialize a recovery handle that creates a new database containing
|
|
** the recovered data.
|
|
*/
|
|
sqlite3_recover *sqlite3_recover_init(
|
|
sqlite3* db,
|
|
const char *zDb,
|
|
const char *zUri
|
|
){
|
|
return recoverInit(db, zDb, zUri, 0, 0);
|
|
}
|
|
|
|
/*
|
|
** Initialize a recovery handle that returns recovered data in the
|
|
** form of SQL statements via a callback.
|
|
*/
|
|
sqlite3_recover *sqlite3_recover_init_sql(
|
|
sqlite3* db,
|
|
const char *zDb,
|
|
int (*xSql)(void*, const char*),
|
|
void *pSqlCtx
|
|
){
|
|
return recoverInit(db, zDb, 0, xSql, pSqlCtx);
|
|
}
|
|
|
|
/*
|
|
** Return the handle error message, if any.
|
|
*/
|
|
const char *sqlite3_recover_errmsg(sqlite3_recover *p){
|
|
return (p && p->errCode!=SQLITE_NOMEM) ? p->zErrMsg : "out of memory";
|
|
}
|
|
|
|
/*
|
|
** Return the handle error code.
|
|
*/
|
|
int sqlite3_recover_errcode(sqlite3_recover *p){
|
|
return p ? p->errCode : SQLITE_NOMEM;
|
|
}
|
|
|
|
/*
|
|
** Configure the handle.
|
|
*/
|
|
int sqlite3_recover_config(sqlite3_recover *p, int op, void *pArg){
|
|
int rc = SQLITE_OK;
|
|
if( p==0 ){
|
|
rc = SQLITE_NOMEM;
|
|
}else if( p->eState!=RECOVER_STATE_INIT ){
|
|
rc = SQLITE_MISUSE;
|
|
}else{
|
|
switch( op ){
|
|
case 789:
|
|
/* This undocumented magic configuration option is used to set the
|
|
** name of the auxiliary database that is ATTACH-ed to the database
|
|
** connection and used to hold state information during the
|
|
** recovery process. This option is for debugging use only and
|
|
** is subject to change or removal at any time. */
|
|
sqlite3_free(p->zStateDb);
|
|
p->zStateDb = recoverMPrintf(p, "%s", (char*)pArg);
|
|
break;
|
|
|
|
case SQLITE_RECOVER_LOST_AND_FOUND: {
|
|
const char *zArg = (const char*)pArg;
|
|
sqlite3_free(p->zLostAndFound);
|
|
if( zArg ){
|
|
p->zLostAndFound = recoverMPrintf(p, "%s", zArg);
|
|
}else{
|
|
p->zLostAndFound = 0;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case SQLITE_RECOVER_FREELIST_CORRUPT:
|
|
p->bFreelistCorrupt = *(int*)pArg;
|
|
break;
|
|
|
|
case SQLITE_RECOVER_ROWIDS:
|
|
p->bRecoverRowid = *(int*)pArg;
|
|
break;
|
|
|
|
case SQLITE_RECOVER_SLOWINDEXES:
|
|
p->bSlowIndexes = *(int*)pArg;
|
|
break;
|
|
|
|
default:
|
|
rc = SQLITE_NOTFOUND;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
** Do a unit of work towards the recovery job. Return SQLITE_OK if
|
|
** no error has occurred but database recovery is not finished, SQLITE_DONE
|
|
** if database recovery has been successfully completed, or an SQLite
|
|
** error code if an error has occurred.
|
|
*/
|
|
int sqlite3_recover_step(sqlite3_recover *p){
|
|
if( p==0 ) return SQLITE_NOMEM;
|
|
if( p->errCode==SQLITE_OK ) recoverStep(p);
|
|
if( p->eState==RECOVER_STATE_DONE && p->errCode==SQLITE_OK ){
|
|
return SQLITE_DONE;
|
|
}
|
|
return p->errCode;
|
|
}
|
|
|
|
/*
|
|
** Do the configured recovery operation. Return SQLITE_OK if successful, or
|
|
** else an SQLite error code.
|
|
*/
|
|
int sqlite3_recover_run(sqlite3_recover *p){
|
|
while( SQLITE_OK==sqlite3_recover_step(p) );
|
|
return sqlite3_recover_errcode(p);
|
|
}
|
|
|
|
|
|
/*
|
|
** Free all resources associated with the recover handle passed as the only
|
|
** argument. The results of using a handle with any sqlite3_recover_**
|
|
** API function after it has been passed to this function are undefined.
|
|
**
|
|
** A copy of the value returned by the first call made to sqlite3_recover_run()
|
|
** on this handle is returned, or SQLITE_OK if sqlite3_recover_run() has
|
|
** not been called on this handle.
|
|
*/
|
|
int sqlite3_recover_finish(sqlite3_recover *p){
|
|
int rc;
|
|
if( p==0 ){
|
|
rc = SQLITE_NOMEM;
|
|
}else{
|
|
recoverFinalCleanup(p);
|
|
if( p->bCloseTransaction && sqlite3_get_autocommit(p->dbIn)==0 ){
|
|
rc = sqlite3_exec(p->dbIn, "END", 0, 0, 0);
|
|
if( p->errCode==SQLITE_OK ) p->errCode = rc;
|
|
}
|
|
rc = p->errCode;
|
|
sqlite3_free(p->zErrMsg);
|
|
sqlite3_free(p->zStateDb);
|
|
sqlite3_free(p->zLostAndFound);
|
|
sqlite3_free(p->pPage1Cache);
|
|
sqlite3_free(p);
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
#endif /* ifndef SQLITE_OMIT_VIRTUALTABLE */
|