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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, TBOOX Open Source Group.
*
* @author ruki
* @file convert.c
*
*/
/* //////////////////////////////////////////////////////////////////////////////////////
* trace
*/
#define TB_TRACE_MODULE_NAME "convert"
#define TB_TRACE_MODULE_DEBUG (0)
/* //////////////////////////////////////////////////////////////////////////////////////
* includes
*/
#include "prefix.h"
/* //////////////////////////////////////////////////////////////////////////////////////
* globals
*/
// the charset entry type
typedef struct __xm_charset_entry_t
{
// the charset type
tb_size_t type;
// the charset name
tb_char_t const* name;
}xm_charset_entry_t, *xm_charset_entry_ref_t;
// the charsets, @note: type & name is sorted
static xm_charset_entry_t g_charsets[] =
{
{TB_CHARSET_TYPE_ANSI, "ansi" }
, {TB_CHARSET_TYPE_ASCII, "ascii" }
, {TB_CHARSET_TYPE_GB2312, "gb2312" }
, {TB_CHARSET_TYPE_GBK, "gbk" }
, {TB_CHARSET_TYPE_ISO8859, "iso8859" }
, {TB_CHARSET_TYPE_UCS2 | TB_CHARSET_TYPE_NE, "ucs2" }
, {TB_CHARSET_TYPE_UCS4 | TB_CHARSET_TYPE_NE, "ucs4" }
, {TB_CHARSET_TYPE_UTF16 | TB_CHARSET_TYPE_NE, "utf16" }
, {TB_CHARSET_TYPE_UTF16 | TB_CHARSET_TYPE_BE, "utf16be" }
, {TB_CHARSET_TYPE_UTF16 | TB_CHARSET_TYPE_LE, "utf16le" }
, {TB_CHARSET_TYPE_UTF32 | TB_CHARSET_TYPE_NE, "utf32" }
, {TB_CHARSET_TYPE_UTF32 | TB_CHARSET_TYPE_BE, "utf32be" }
, {TB_CHARSET_TYPE_UTF32 | TB_CHARSET_TYPE_LE, "utf32le" }
, {TB_CHARSET_TYPE_UTF8, "utf8" }
};
/* //////////////////////////////////////////////////////////////////////////////////////
* finder
*/
static tb_long_t xm_string_charset_comp_by_name(tb_iterator_ref_t iterator, tb_cpointer_t item, tb_cpointer_t name)
{
return tb_stricmp(((xm_charset_entry_ref_t)item)->name, (tb_char_t const*)name);
}
static xm_charset_entry_ref_t xm_string_charset_find_by_name(tb_char_t const* name)
{
// make iterator
tb_array_iterator_t array_iterator;
tb_iterator_ref_t iterator = tb_array_iterator_init_mem(&array_iterator, g_charsets, tb_arrayn(g_charsets), sizeof(xm_charset_entry_t));
tb_assert_and_check_return_val(iterator, tb_null);
// find it by the binary search
tb_size_t itor = tb_binary_find_all_if(iterator, xm_string_charset_comp_by_name, name);
if (itor != tb_iterator_tail(iterator))
return (xm_charset_entry_ref_t)tb_iterator_item(iterator, itor);
else return tb_null;
}
/* //////////////////////////////////////////////////////////////////////////////////////
* 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)
{
// check
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_string_charset_find_by_name(ftype_cstr);
xm_charset_entry_ref_t tcharset = xm_string_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);
}
// ok
return 1;
}
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