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/*!A cross-platform build utility based on Lua
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Copyright (C) 2015-present, Xmake Open Source Community.
*
* @author ruki
* @file block_compress.c
*
*/
/* //////////////////////////////////////////////////////////////////////////////////////
* trace
*/
#define TB_TRACE_MODULE_NAME "block_compress"
#define TB_TRACE_MODULE_DEBUG (0)
/* //////////////////////////////////////////////////////////////////////////////////////
* includes
*/
#include "prefix.h"
/* //////////////////////////////////////////////////////////////////////////////////////
* implementation
*/
tb_int_t xm_lz4_block_compress(lua_State *lua) {
tb_assert_and_check_return_val(lua, 0);
// get data and size
tb_int_t size = 0;
tb_byte_t const *data = tb_null;
if (xm_lua_isinteger(lua, 1)) {
data = (tb_byte_t const *)(tb_size_t)(tb_long_t)lua_tointeger(lua, 1);
}
if (xm_lua_isinteger(lua, 2)) {
size = (tb_int_t)lua_tointeger(lua, 2);
}
if (!data || !size || size > LZ4_MAX_INPUT_SIZE) {
lua_pushnil(lua);
lua_pushfstring(lua, "invalid data(%p) and size(%d)!", data, (tb_int_t)size);
return 2;
}
tb_assert_static(sizeof(lua_Integer) >= sizeof(tb_pointer_t));
// do compress
tb_bool_t ok = tb_false;
tb_byte_t *output_data = tb_null;
tb_byte_t buffer[8192];
do {
tb_int_t output_size = LZ4_compressBound(size);
tb_assert_and_check_break(output_size);
output_data = output_size <= sizeof(buffer) ? buffer : (tb_byte_t *)tb_malloc(output_size);
tb_assert_and_check_break(output_data);
tb_int_t real = LZ4_compress_default((tb_char_t const *)data, (tb_char_t *)output_data, size, output_size);
tb_assert_and_check_break(real > 0);
lua_pushlstring(lua, (tb_char_t const *)output_data, real);
ok = tb_true;
} while (0);
if (output_data && output_data != buffer) {
tb_free(output_data);
output_data = tb_null;
}
if (!ok) {
lua_pushnil(lua);
}
return 1;
}
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