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/*
See license.txt in the root of this project.
*/
# include "luametatex.h"
# include "lmtoptional.h"
# define ZSTD_DEFAULTCLEVEL 3
typedef struct zstdlib_state_info {
int initialized;
int padding;
size_t (*ZSTD_compressBound) (size_t srcSize);
size_t (*ZSTD_getFrameContentSize) (const void *, size_t);
size_t (*ZSTD_compress) (void *dst, size_t dstCapacity, const void *src, size_t srcSize, int compressionLevel);
size_t (*ZSTD_decompress) (void *dst, size_t dstCapacity, const void *src, size_t compressedSize);
/* int (*ZSTD_minCLevel) (void); */
/* int (*ZSTD_maxCLevel) (void); */
/* unsigned (*ZSTD_isError) (size_t code); */
/* const char *(*ZSTD_getErrorName) (size_t code); */
} zstdlib_state_info;
static zstdlib_state_info zstdlib_state = {
.initialized = 0,
.padding = 0,
.ZSTD_compressBound = NULL,
.ZSTD_getFrameContentSize = NULL,
.ZSTD_compress = NULL,
.ZSTD_decompress = NULL,
/* .ZSTD_minCLevel = NULL, */
/* .ZSTD_maxCLevel = NULL, */
/* .ZSTD_isError = NULL, */
/* .ZSTD_getErrorName = NULL, */
};
static int zstdlib_compress(lua_State *L)
{
if (zstdlib_state.initialized) {
size_t sourcesize = 0;
const char *source = luaL_checklstring(L, 1, &sourcesize);
int level = lmt_optinteger(L, 2, ZSTD_DEFAULTCLEVEL);
size_t targetsize = zstdlib_state.ZSTD_compressBound(sourcesize);
luaL_Buffer buffer;
char *target = luaL_buffinitsize(L, &buffer, targetsize);
size_t result = zstdlib_state.ZSTD_compress(target, targetsize, source, sourcesize, level);
if (result > 0) {
luaL_pushresultsize(&buffer, result);
} else {
lua_pushnil(L);
}
return 1;
} else {
return 0;
}
}
static int zstdlib_decompress(lua_State *L)
{
if (zstdlib_state.initialized) {
size_t sourcesize = 0;
const char *source = luaL_checklstring(L, 1, &sourcesize);
size_t targetsize = zstdlib_state.ZSTD_getFrameContentSize(source, sourcesize);
luaL_Buffer buffer;
char *target = luaL_buffinitsize(L, &buffer, targetsize);
size_t result = zstdlib_state.ZSTD_decompress(target, targetsize, source, sourcesize);
if (result > 0) {
luaL_pushresultsize(&buffer, result);
} else {
lua_pushnil(L);
}
return 1;
} else {
return 0;
}
}
static int zstdlib_initialize(lua_State *L)
{
if (! zstdlib_state.initialized) {
const char *filename = lua_tostring(L, 1);
if (filename) {
lmt_library lib = lmt_library_load(filename);
zstdlib_state.ZSTD_compressBound = lmt_library_find(lib, "ZSTD_compressBound");
zstdlib_state.ZSTD_getFrameContentSize = lmt_library_find(lib, "ZSTD_getFrameContentSize");
zstdlib_state.ZSTD_compress = lmt_library_find(lib, "ZSTD_compress");
zstdlib_state.ZSTD_decompress = lmt_library_find(lib, "ZSTD_decompress");
/* zstdlib_state.ZSTD_minCLevel = lmt_library_find(lib, "ZSTD_minCLevel"); */
/* zstdlib_state.ZSTD_maxCLevel = lmt_library_find(lib, "ZSTD_maxCLevel"); */
/* zstdlib_state.ZSTD_isError = lmt_library_find(lib, "ZSTD_isError"); */
/* zstdlib_state.ZSTD_getErrorName = lmt_library_find(lib, "ZSTD_getErrorName"); */
zstdlib_state.initialized = lmt_library_okay(lib);
}
}
lua_pushboolean(L, zstdlib_state.initialized);
return 1;
}
static struct luaL_Reg zstdlib_function_list[] = {
{ "initialize", zstdlib_initialize },
{ "compress", zstdlib_compress },
{ "decompress", zstdlib_decompress },
{ NULL, NULL },
};
int luaopen_zstd(lua_State * L)
{
lmt_library_register(L, "zstd", zstdlib_function_list);
return 0;
}
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