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/*
See license.txt in the root of this project.
*/
# include <stdlib.h>
# include "luametatex.h"
# define lzo_output_length(n) (n + n / 16 + 64 + 64) /* we add 64 instead of 3 */
# define LZO_E_OK 0
typedef struct lzolib_state_info {
int initialized;
int padding;
int (*lzo1x_1_compress) (const char *source, size_t sourcesize, char *target, size_t *targetsize, void *wrkmem);
int (*lzo1x_decompress_safe) (const char *source, size_t sourcesize, char *target, size_t *targetsize, void *wrkmem);
} lzolib_state_info;
static lzolib_state_info lzolib_state = {
.initialized = 0,
.padding = 0,
.lzo1x_1_compress = NULL,
.lzo1x_decompress_safe = NULL,
};
static int lzolib_compress(lua_State *L)
{
if (lzolib_state.initialized) {
char *wrkmem = lmt_memory_malloc(16384 + 32); /* we some plenty of slack, normally 2 seemss enough */
size_t sourcesize = 0;
const char *source = luaL_checklstring(L, 1, &sourcesize);
luaL_Buffer buffer;
size_t targetsize = lzo_output_length(sourcesize);
char *target = luaL_buffinitsize(L, &buffer, targetsize);
int result = lzolib_state.lzo1x_1_compress(source, sourcesize, target, &targetsize, wrkmem);
if (result == LZO_E_OK) {
luaL_pushresultsize(&buffer, targetsize);
} else {
lua_pushnil(L);
}
lmt_memory_free(wrkmem);
return 1;
} else {
return 0;
}
}
static int lzolib_decompresssize(lua_State *L)
{
if (lzolib_state.initialized) {
size_t sourcesize = 0;
const char *source = luaL_checklstring(L, 1, &sourcesize);
size_t targetsize = luaL_checkinteger(L, 2);
if (source && targetsize > 0) {
luaL_Buffer buffer;
char *target = luaL_buffinitsize(L, &buffer, targetsize);
int result = lzolib_state.lzo1x_decompress_safe(source, sourcesize, target, &targetsize, NULL);
if (result == LZO_E_OK) {
luaL_pushresultsize(&buffer, targetsize);
} else {
lua_pushnil(L);
}
} else {
lua_pushnil(L);
}
return 1;
} else {
return 0;
}
}
static int lzolib_initialize(lua_State *L)
{
if (! lzolib_state.initialized) {
const char *filename = lua_tostring(L, 1);
if (filename) {
lmt_library lib = lmt_library_load(filename);
lzolib_state.lzo1x_1_compress = lmt_library_find(lib, "lzo1x_1_compress");
lzolib_state.lzo1x_decompress_safe = lmt_library_find(lib, "lzo1x_decompress_safe");
lzolib_state.initialized = lmt_library_okay(lib);
}
}
lua_pushboolean(L, lzolib_state.initialized);
return 1;
}
static struct luaL_Reg lzolib_function_list[] = {
{ "initialize", lzolib_initialize },
{ "compress", lzolib_compress },
{ "decompresssize", lzolib_decompresssize },
{ NULL, NULL },
};
int luaopen_lzo(lua_State * L)
{
lmt_library_register(L, "lzo", lzolib_function_list);
return 0;
}
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