85 lines
2.0 KiB
C
85 lines
2.0 KiB
C
/*
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* Copyright (C) 2006-2008 Junjiro Okajima
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* Copyright (C) 2006-2008 Tomas Matejicek, slax.org
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*
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* LICENSE follows the described one in lzma.
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*/
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/* $Id: sqlzma.h,v 1.20 2008-03-12 16:58:34 jro Exp $ */
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#ifndef __sqlzma_h__
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#define __sqlzma_h__
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#ifndef __KERNEL__
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#include <stdlib.h>
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#include <string.h>
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#include <zlib.h>
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#ifdef _REENTRANT
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#include <pthread.h>
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#endif
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#else
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#include <linux/zlib.h>
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#endif
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#define _7ZIP_BYTE_DEFINED
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/*
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* detect the compression method automatically by the first byte of compressed
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* data.
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* according to rfc1950, the first byte of zlib compression must be 0x?8.
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*/
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#define is_lzma(c) (c == 0x5d)
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/* ---------------------------------------------------------------------- */
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifndef __KERNEL__
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/* for mksquashfs only */
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struct sqlzma_opts {
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unsigned int try_lzma;
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unsigned int dicsize;
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};
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int sqlzma_cm(struct sqlzma_opts *opts, z_stream *stream, Bytef *next_in,
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uInt avail_in, Bytef *next_out, uInt avail_out);
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#endif
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/* ---------------------------------------------------------------------- */
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/*
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* Three patterns for sqlzma uncompression. very dirty code.
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* - kernel space (squashfs kernel module)
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* - user space with pthread (mksquashfs)
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* - user space without pthread (unsquashfs)
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*/
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struct sized_buf {
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unsigned int sz;
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unsigned char *buf;
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};
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enum {SQUN_PROB, SQUN_RESULT, SQUN_LAST};
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struct sqlzma_un {
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int un_lzma;
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struct sized_buf un_a[SQUN_LAST];
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unsigned char un_prob[31960]; /* unlzma 64KB - 1MB */
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z_stream un_stream;
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#define un_cmbuf un_stream.next_in
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#define un_cmlen un_stream.avail_in
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#define un_resbuf un_stream.next_out
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#define un_resroom un_stream.avail_out
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#define un_reslen un_stream.total_out
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};
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int sqlzma_init(struct sqlzma_un *un, int do_lzma, unsigned int res_sz);
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int sqlzma_un(struct sqlzma_un *un, struct sized_buf *src,
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struct sized_buf *dst);
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void sqlzma_fin(struct sqlzma_un *un);
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/* ---------------------------------------------------------------------- */
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#ifdef __cplusplus
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};
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#endif
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#endif
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