mirror of
https://github.com/tursodatabase/libsql.git
synced 2025-05-02 19:12:11 +00:00
d3a156caf5
A common complain with libSQL is how to run extensions. The main mechanism, with a .so, has a lot of issues around how those .so are distributed. The most common extensions are the ones in the sqlean package. We can improve this experience by bundling them in our sqlite build. Not all SQLean extensions are kosher: some of them, like fileio, use the vfs. Others, are deemed too complex. The extensions included here are a subset that we deem important enough, and low risk enough, to just be a part of the main bundle.
73 lines
1.7 KiB
C
73 lines
1.7 KiB
C
// Copyright (c) 2023 Anton Zhiyanov, MIT License
|
|
// https://github.com/nalgeon/sqlean
|
|
|
|
// Hex encoding/decoding
|
|
|
|
#include <stddef.h>
|
|
#include <stdint.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
|
|
uint8_t* hex_encode(const uint8_t* src, size_t len, size_t* out_len) {
|
|
*out_len = len * 2;
|
|
uint8_t* encoded = malloc(*out_len + 1);
|
|
if (encoded == NULL) {
|
|
*out_len = 0;
|
|
return NULL;
|
|
}
|
|
for (size_t i = 0; i < len; i++) {
|
|
sprintf((char*)encoded + (i * 2), "%02x", src[i]);
|
|
}
|
|
encoded[*out_len] = '\0';
|
|
*out_len = len * 2;
|
|
return encoded;
|
|
}
|
|
|
|
uint8_t* hex_decode(const uint8_t* src, size_t len, size_t* out_len) {
|
|
if (len % 2 != 0) {
|
|
// input length must be even
|
|
return NULL;
|
|
}
|
|
|
|
size_t decoded_len = len / 2;
|
|
uint8_t* decoded = malloc(decoded_len);
|
|
if (decoded == NULL) {
|
|
*out_len = 0;
|
|
return NULL;
|
|
}
|
|
|
|
for (size_t i = 0; i < decoded_len; i++) {
|
|
uint8_t hi = src[i * 2];
|
|
uint8_t lo = src[i * 2 + 1];
|
|
|
|
if (hi >= '0' && hi <= '9') {
|
|
hi -= '0';
|
|
} else if (hi >= 'A' && hi <= 'F') {
|
|
hi -= 'A' - 10;
|
|
} else if (hi >= 'a' && hi <= 'f') {
|
|
hi -= 'a' - 10;
|
|
} else {
|
|
// invalid character
|
|
free(decoded);
|
|
return NULL;
|
|
}
|
|
|
|
if (lo >= '0' && lo <= '9') {
|
|
lo -= '0';
|
|
} else if (lo >= 'A' && lo <= 'F') {
|
|
lo -= 'A' - 10;
|
|
} else if (lo >= 'a' && lo <= 'f') {
|
|
lo -= 'a' - 10;
|
|
} else {
|
|
// invalid character
|
|
free(decoded);
|
|
return NULL;
|
|
}
|
|
|
|
decoded[i] = (hi << 4) | lo;
|
|
}
|
|
|
|
*out_len = decoded_len;
|
|
return decoded;
|
|
}
|