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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 compress.c
*
*/
/* //////////////////////////////////////////////////////////////////////////////////////
* trace
*/
#define TB_TRACE_MODULE_NAME "compress"
#define TB_TRACE_MODULE_DEBUG (0)
/* //////////////////////////////////////////////////////////////////////////////////////
* includes
*/
#include "prefix.h"
/* //////////////////////////////////////////////////////////////////////////////////////
* implementation
*/
tb_int_t xm_lz4_compress(lua_State* lua)
{
// check
tb_assert_and_check_return_val(lua, 0);
// get data and size
tb_size_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_size_t)lua_tointeger(lua, 2);
if (!data || !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_char_t const* error = tb_null;
tb_byte_t* output_data = tb_null;
tb_byte_t buffer[8192];
do
{
tb_size_t output_size = LZ4F_compressFrameBound(size, tb_null);
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_size_t real_or_errs = LZ4F_compressFrame(output_data, output_size, data, size, tb_null);
if (LZ4F_isError(real_or_errs))
{
error = LZ4F_getErrorName(real_or_errs);
break;
}
lua_pushlstring(lua, (tb_char_t const*)output_data, real_or_errs);
ok = tb_true;
} while (0);
if (output_data && output_data != buffer)
{
tb_free(output_data);
output_data = tb_null;
}
if (!ok)
{
lua_pushnil(lua);
lua_pushstring(lua, error? error : "unknown");
return 2;
}
return 1;
}
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