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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 convert.c
*
*/
/* //////////////////////////////////////////////////////////////////////////////////////
* trace
*/
#define TB_TRACE_MODULE_NAME "convert"
#define TB_TRACE_MODULE_DEBUG (0)
/* //////////////////////////////////////////////////////////////////////////////////////
* includes
*/
#include "prefix.h"
#include "../utils/charset.h"
/* //////////////////////////////////////////////////////////////////////////////////////
* implementation
*/
/* convert string
*
* @param str the string
* @param ftype the from-charset type, e.g. ascii, gb2312, gbk, ios8859, ucs2, ucs4, utf8, utf16, utf32
* @param ttype the to-charset type
*
* @code
* local result = string.convert(str, "gbk", "utf8")
* local result = string.convert(str, "utf8", "gb2312")
* @endcode
*/
tb_int_t xm_string_convert(lua_State *lua) {
tb_assert_and_check_return_val(lua, 0);
// get the string and charset types
size_t src_size = 0;
tb_char_t const *src_cstr = luaL_checklstring(lua, 1, &src_size);
tb_char_t const *ftype_cstr = luaL_checkstring(lua, 2);
tb_char_t const *ttype_cstr = luaL_checkstring(lua, 3);
tb_check_return_val(src_cstr && ftype_cstr && ttype_cstr, 0);
// find charsets
xm_charset_entry_ref_t fcharset = xm_charset_find_by_name(ftype_cstr);
xm_charset_entry_ref_t tcharset = xm_charset_find_by_name(ttype_cstr);
luaL_argcheck(lua, fcharset, 2, "charset not found");
luaL_argcheck(lua, tcharset, 3, "charset not found");
tb_check_return_val(fcharset && tcharset, 0);
// empty string?
if (!src_size) {
lua_pushstring(lua, "");
} else {
// convert string
tb_long_t dst_size = 0;
tb_size_t dst_maxn = (tb_size_t)src_size << 2;
tb_byte_t *dst_data = tb_malloc_bytes(dst_maxn);
if (dst_data && dst_maxn &&
(dst_size = tb_charset_conv_data(fcharset->type,
tcharset->type,
(tb_byte_t const *)src_cstr,
(tb_size_t)src_size,
dst_data,
dst_maxn)) >= 0 &&
dst_size < dst_maxn) {
lua_pushlstring(lua, (tb_char_t const *)dst_data, dst_size);
} else {
lua_pushnil(lua);
}
tb_free(dst_data);
}
return 1;
}
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