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/*
See license.txt in the root of this project.
*/
# define ZLIB_CONST 1
# include "luametatex.h"
/*tex
This is a rather minimalistic interface to zlib. We can wrap around it and need some specific
file overhead anyway. Also, we never needed all that stream stuff.
*/
# define ziplib_in_char_ptr const unsigned char *
# define ziplib_out_char_ptr unsigned char *
# define ziplib_buffer_size 16*1024
static int ziplib_aux_compress(
lua_State *L,
const char *data,
int size,
int level,
int method,
int window,
int memory,
int strategy,
int buffersize
)
{
int state;
z_stream zipstream;
zipstream.zalloc = &lmt_zlib_alloc; /* Z_NULL */
zipstream.zfree = &lmt_zlib_free; /* Z_NULL */
zipstream.next_out = Z_NULL;
zipstream.avail_out = 0;
zipstream.next_in = Z_NULL;
zipstream.avail_in = 0;
state = deflateInit2(&zipstream, level, method, window, memory, strategy);
if (state == Z_OK) {
luaL_Buffer buffer;
luaL_buffinit(L, &buffer);
zipstream.next_in = (ziplib_in_char_ptr) data;
zipstream.avail_in = size;
while (1) {
zipstream.next_out = (ziplib_out_char_ptr) luaL_prepbuffsize(&buffer, buffersize);
zipstream.avail_out = buffersize;
state = deflate(&zipstream, Z_FINISH);
if (state != Z_OK && state != Z_STREAM_END) {
lua_pushnil(L);
break;
} else {
luaL_addsize(&buffer, buffersize - zipstream.avail_out);
if (zipstream.avail_out != 0) {
luaL_pushresult(&buffer);
break;
}
}
}
deflateEnd(&zipstream);
} else {
lua_pushnil(L);
}
return 1;
}
static int ziplib_compress(lua_State *L)
{
const char *data = luaL_checkstring(L, 1);
int size = (int) lua_rawlen(L, 1);
int level = lmt_optinteger(L, 2, Z_DEFAULT_COMPRESSION);
int method = lmt_optinteger(L, 3, Z_DEFLATED);
int window = lmt_optinteger(L, 4, 15);
int memory = lmt_optinteger(L, 5, 8);
int strategy = lmt_optinteger(L, 6, Z_DEFAULT_STRATEGY);
return ziplib_aux_compress(L, data, size, level, method, window, memory, strategy, ziplib_buffer_size);
}
static int ziplib_compresssize(lua_State *L)
{
const char *data = luaL_checkstring(L, 1);
int size = (int) lua_rawlen(L, 1);
int level = lmt_optinteger(L, 2, Z_DEFAULT_COMPRESSION);
int buffersize = lmt_optinteger(L, 3, ziplib_buffer_size);
int window = lmt_optinteger(L, 4, 15); /* like decompresssize */
return ziplib_aux_compress(L, data, size, level, Z_DEFLATED, window, 8, Z_DEFAULT_STRATEGY, buffersize);
}
static int ziplib_decompress(lua_State *L)
{
const char *data = luaL_checkstring(L, 1);
int size = (int) lua_rawlen(L, 1);
int window = lmt_optinteger(L, 2, 15);
int state;
z_stream zipstream;
zipstream.zalloc = &lmt_zlib_alloc; /* Z_NULL */
zipstream.zfree = &lmt_zlib_free; /* Z_NULL */
zipstream.next_out = Z_NULL;
zipstream.avail_out = 0;
zipstream.next_in = Z_NULL;
zipstream.avail_in = 0;
state = inflateInit2(&zipstream, window);
if (state == Z_OK) {
luaL_Buffer buffer;
luaL_buffinit(L, &buffer);
zipstream.next_in = (ziplib_in_char_ptr) data;
zipstream.avail_in = size;
while (1) {
zipstream.next_out = (ziplib_out_char_ptr) luaL_prepbuffsize(&buffer, ziplib_buffer_size);
zipstream.avail_out = ziplib_buffer_size;
state = inflate(&zipstream, Z_NO_FLUSH);
luaL_addsize(&buffer, ziplib_buffer_size - zipstream.avail_out);
if (state == Z_STREAM_END) {
luaL_pushresult(&buffer);
break;
} else if (state != Z_OK) {
lua_pushnil(L);
break;
} else if (zipstream.avail_out == 0) {
continue;
} else if (zipstream.avail_in == 0) {
luaL_pushresult(&buffer);
break;
}
}
inflateEnd(&zipstream);
} else {
lua_pushnil(L);
}
return 1;
}
static int ziplib_decompresssize(lua_State *L)
{
const char *data = luaL_checkstring(L, 1);
int size = (int) lua_rawlen(L, 1);
int targetsize = lmt_tointeger(L, 2);
int window = lmt_optinteger(L, 3, 15);
int state;
z_stream zipstream;
zipstream.zalloc = &lmt_zlib_alloc; /* Z_NULL */
zipstream.zfree = &lmt_zlib_free; /* Z_NULL */
zipstream.next_out = Z_NULL;
zipstream.avail_out = 0;
zipstream.next_in = Z_NULL;
zipstream.avail_in = 0;
state = inflateInit2(&zipstream, window);
if (state == Z_OK) {
luaL_Buffer buffer;
zipstream.next_in = (ziplib_in_char_ptr) data;
zipstream.avail_in = size;
zipstream.next_out = (ziplib_out_char_ptr) luaL_buffinitsize(L, &buffer, (lua_Integer) targetsize + 100);
zipstream.avail_out = targetsize + 100;
state = inflate(&zipstream, Z_NO_FLUSH); /* maybe Z_FINISH buffer large enough */
if (state != Z_OK && state != Z_STREAM_END) {
lua_pushnil(L);
} else if (zipstream.avail_in == 0) {
luaL_pushresultsize(&buffer, targetsize);
} else {
lua_pushnil(L);
}
inflateEnd(&zipstream);
} else {
lua_pushnil(L);
}
return 1;
}
static int ziplib_adler32(lua_State *L)
{
int checksum = lmt_optinteger(L, 2, 0);
size_t buffersize = 0;
const char *buffer = lua_tolstring(L, 1, &buffersize);
checksum = adler32(checksum, (ziplib_in_char_ptr) buffer, (unsigned int) buffersize);
lua_pushinteger(L, checksum);
return 1;
}
static int ziplib_crc32(lua_State *L)
{
int checksum = lmt_optinteger(L, 2, 0);
size_t buffersize = 0;
const char *buffer = lua_tolstring(L, 1, &buffersize);
checksum = crc32(checksum, (ziplib_in_char_ptr) buffer, (unsigned int) buffersize);
lua_pushinteger(L, checksum);
return 1;
}
static struct luaL_Reg ziplib_function_list[] = {
{ "compress", ziplib_compress },
{ "compresssize", ziplib_compresssize },
{ "decompress", ziplib_decompress },
{ "decompresssize", ziplib_decompresssize },
{ "adler32", ziplib_adler32 },
{ "crc32", ziplib_crc32 },
{ NULL, NULL },
};
int luaopen_xzip(lua_State *L) {
lua_newtable(L);
luaL_setfuncs(L, ziplib_function_list, 0);
return 1;
}
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