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/*
See license.txt in the root of this project.
*/
# include <stdlib.h>
# include "luametatex.h"
/*
We only need a few definitions and it's nice that they are already prepared for extensions.
*/
typedef enum {
LZMA_RESERVED_ENUM = 0
} lzma_reserved_enum;
typedef enum {
LZMA_OK = 0,
LZMA_STREAM_END = 1,
LZMA_NO_CHECK = 2,
LZMA_UNSUPPORTED_CHECK = 3,
LZMA_GET_CHECK = 4,
LZMA_MEM_ERROR = 5,
LZMA_MEMLIMIT_ERROR = 6,
LZMA_FORMAT_ERROR = 7,
LZMA_OPTIONS_ERROR = 8,
LZMA_DATA_ERROR = 9,
LZMA_BUF_ERROR = 10,
LZMA_PROG_ERROR = 11,
} lzma_ret;
typedef enum {
LZMA_RUN = 0,
LZMA_SYNC_FLUSH = 1,
LZMA_FULL_FLUSH = 2,
LZMA_FULL_BARRIER = 4,
LZMA_FINISH = 3
} lzma_action;
typedef enum {
LZMA_CHECK_NONE = 0,
LZMA_CHECK_CRC32 = 1,
LZMA_CHECK_CRC64 = 4,
LZMA_CHECK_SHA256 = 10
} lzma_check;
typedef struct lzma_internal_s lzma_internal;
typedef struct {
void *(*alloc)(void *opaque, size_t nmemb, size_t size);
void (*free )(void *opaque, void *ptr);
void *opaque;
} lzma_allocator;
typedef struct {
const uint8_t *next_in;
size_t avail_in;
uint64_t total_in;
uint8_t *next_out;
size_t avail_out;
uint64_t total_out;
const lzma_allocator *allocator;
lzma_internal *internal;
void *reserved_ptr1;
void *reserved_ptr2;
void *reserved_ptr3;
void *reserved_ptr4;
uint64_t reserved_int1;
uint64_t reserved_int2;
size_t reserved_int3;
size_t reserved_int4;
lzma_reserved_enum reserved_enum1;
lzma_reserved_enum reserved_enum2;
} lzma_stream;
# define LZMA_STREAM_INIT { NULL, 0, 0, NULL, 0, 0, NULL, NULL, NULL, NULL, NULL, NULL, 0, 0, 0, 0, LZMA_RESERVED_ENUM, LZMA_RESERVED_ENUM }
# define LZMA_TELL_NO_CHECK UINT32_C(0x01)
# define LZMA_TELL_UNSUPPORTED_CHECK UINT32_C(0x02)
# define LZMA_TELL_ANY_CHECK UINT32_C(0x04)
# define LZMA_CONCATENATED UINT32_C(0x08)
typedef struct lzmalib_state_info {
int initialized;
int padding;
int (*lzma_auto_decoder) (lzma_stream *strm, uint64_t memlimit, uint32_t flags);
int (*lzma_easy_encoder) (lzma_stream *strm, uint32_t preset, lzma_check check);
int (*lzma_code) (lzma_stream *strm, lzma_action action);
int (*lzma_end) (lzma_stream *strm);
} lzmalib_state_info;
static lzmalib_state_info lzmalib_state = {
.initialized = 0,
.padding = 0,
.lzma_auto_decoder = NULL,
.lzma_easy_encoder = NULL,
.lzma_code = NULL,
.lzma_end = NULL,
};
# define lzma_default_level 6
# define lzma_default_size 0xFFFF
static int lzmalib_compress(lua_State *L)
{
if (lzmalib_state.initialized) {
size_t sourcesize = 0;
const char *source = luaL_checklstring(L, 1, &sourcesize);
int level = lmt_optinteger(L, 2, lzma_default_level);
int targetsize = lmt_optinteger(L, 3, lzma_default_size);
if (level < 0 || level > 9) {
level = lzma_default_level;
}
if (source) {
lzma_stream strm = LZMA_STREAM_INIT;
int errorcode = lzmalib_state.lzma_easy_encoder(&strm, level, LZMA_CHECK_CRC64);
if (errorcode == LZMA_OK) {
luaL_Buffer buffer;
luaL_buffinit(L, &buffer);
strm.next_in = (const uint8_t *) source;
strm.avail_in = sourcesize;
if (targetsize < lzma_default_size) {
targetsize = lzma_default_size;
}
while (1) {
char *target = luaL_prepbuffsize(&buffer, targetsize);
size_t produced = strm.total_out;
strm.next_out = (uint8_t *) target;
strm.avail_out = targetsize;
errorcode = lzmalib_state.lzma_code(&strm, LZMA_FINISH);
produced = strm.total_out - produced;
luaL_addsize(&buffer, produced);
if (errorcode == LZMA_STREAM_END) {
lzmalib_state.lzma_end(&strm);
luaL_pushresult(&buffer);
return 1;
} else if (errorcode != LZMA_OK) {
lzmalib_state.lzma_end(&strm);
break;
}
}
}
}
}
lua_pushnil(L);
return 1;
}
static int lzmalib_decompress(lua_State *L)
{
if (lzmalib_state.initialized) {
size_t sourcesize = 0;
const char *source = luaL_checklstring(L, 1, &sourcesize);
int targetsize = lmt_optinteger(L, 2, lzma_default_size);
if (source) {
lzma_stream strm = LZMA_STREAM_INIT;
int errorcode = lzmalib_state.lzma_auto_decoder(&strm, UINT64_MAX, LZMA_CONCATENATED);
if (errorcode == LZMA_OK) {
luaL_Buffer buffer;
luaL_buffinit(L, &buffer);
strm.next_in = (const uint8_t *) source;
strm.avail_in = sourcesize;
if (targetsize < lzma_default_size) {
targetsize = lzma_default_size;
}
while (1) {
char *target = luaL_prepbuffsize(&buffer, targetsize);
size_t produced = strm.total_out;
strm.next_out = (uint8_t *) target;
strm.avail_out = targetsize;
errorcode = lzmalib_state.lzma_code(&strm, LZMA_RUN);
produced = strm.total_out - produced;
luaL_addsize(&buffer, produced);
if (errorcode == LZMA_STREAM_END || produced == 0) {
lzmalib_state.lzma_end(&strm);
luaL_pushresult(&buffer);
return 1;
} else if (errorcode != LZMA_OK) {
lzmalib_state.lzma_end(&strm);
break;
}
}
}
}
}
lua_pushnil(L);
return 1;
}
static int lzmalib_initialize(lua_State *L)
{
if (! lzmalib_state.initialized) {
const char *filename = lua_tostring(L, 1);
if (filename) {
lmt_library lib = lmt_library_load(filename);
lzmalib_state.lzma_auto_decoder = lmt_library_find(lib, "lzma_auto_decoder");
lzmalib_state.lzma_easy_encoder = lmt_library_find(lib, "lzma_easy_encoder");
lzmalib_state.lzma_code = lmt_library_find(lib, "lzma_code");
lzmalib_state.lzma_end = lmt_library_find(lib, "lzma_end");
lzmalib_state.initialized = lmt_library_okay(lib);
}
}
lua_pushboolean(L, lzmalib_state.initialized);
return 1;
}
static struct luaL_Reg lzmalib_function_list[] = {
{ "initialize", lzmalib_initialize },
{ "compress", lzmalib_compress },
{ "decompress", lzmalib_decompress },
{ NULL, NULL },
};
int luaopen_lzma(lua_State * L)
{
lmt_library_register(L, "lzma", lzmalib_function_list);
return 0;
}
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