/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 */

#include "common/encoding.h"
#include "common/str.h"
#include "common/ustr.h"
#include "common/util.h"

namespace Common {

// //TODO: This is a quick and dirty converter. Refactoring needed:
// 1. This version is unsafe! There are no checks for end of buffer
//    near i++ operations.
// 2. Original version has an option for performing strict / nonstrict
//    conversion for the 0xD800...0xDFFF interval
// 3. Original version returns a result code. This version does NOT
//    insert 'FFFD' on errors & does not inform caller on any errors
//
// More comprehensive one lives in wintermute/utils/convert_utf.cpp
void String::decodeUTF8(U32String &dst) const {
	// The String class, and therefore the Font class as well, assume one
	// character is one byte, but in this case it's actually an UTF-8
	// string with up to 4 bytes per character. To work around this,
	// convert it to an U32String before drawing it, because our Font class
	// can handle that.
	uint i = 0;
	while (i < _size) {
		uint32 chr = 0;
		uint num = 1;

		if ((_str[i] & 0xF8) == 0xF0) {
			num = 4;
		} else if ((_str[i] & 0xF0) == 0xE0) {
			num = 3;
		} else if ((_str[i] & 0xE0) == 0xC0) {
			num = 2;
		}

		if (i - _size >= num) {
			switch (num) {
			case 4:
				chr |= (_str[i++] & 0x07) << 18;
				chr |= (_str[i++] & 0x3F) << 12;
				chr |= (_str[i++] & 0x3F) << 6;
				chr |= (_str[i++] & 0x3F);
				break;

			case 3:
				chr |= (_str[i++] & 0x0F) << 12;
				chr |= (_str[i++] & 0x3F) << 6;
				chr |= (_str[i++] & 0x3F);
				break;

			case 2:
				chr |= (_str[i++] & 0x1F) << 6;
				chr |= (_str[i++] & 0x3F);
				break;

			default:
				chr = (_str[i++] & 0x7F);
				break;
			}
		} else {
			break;
		}

		dst += chr;
	}
}

// //TODO: This is a quick and dirty converter. Refactoring needed:
// 1. Original version is more effective.
//    This version features buffer = (char)(...) + buffer; pattern that causes
//    unnecessary copying and reallocations, original code works with raw bytes
// 2. Original version has an option for performing strict / nonstrict
//    conversion for the 0xD800...0xDFFF interval
// 3. Original version returns a result code. This version inserts '0xFFFD' if
//    character does not fit in 4 bytes & does not inform caller on any errors
//
// More comprehensive one lives in wintermute/utils/convert_utf.cpp
void U32String::encodeUTF8(String &dst) const {
	static const uint8 firstByteMark[5] = { 0x00, 0x00, 0xC0, 0xE0, 0xF0 };
	char writingBytes[5] = {0x00, 0x00, 0x00, 0x00, 0x00};

	uint i = 0;
	while (i < _size) {
		unsigned short bytesToWrite = 0;
		const uint32 byteMask = 0xBF;
		const uint32 byteMark = 0x80;

		uint32 ch = _str[i++];
		if (ch < (uint32)0x80) {
			bytesToWrite = 1;
		} else if (ch < (uint32)0x800) {
			bytesToWrite = 2;
		} else if (ch < (uint32)0x10000) {
			bytesToWrite = 3;
		} else if (ch <= 0x0010FFFF) {
			bytesToWrite = 4;
		} else {
			bytesToWrite = 3;
			ch = 0x0000FFFD;
		}

		char *pBytes = writingBytes + (4 - bytesToWrite);

		switch (bytesToWrite) {
		case 4:
			pBytes[3] = (char)((ch | byteMark) & byteMask);
			ch >>= 6;
			// fallthrough
		case 3:
			pBytes[2] = (char)((ch | byteMark) & byteMask);
			ch >>= 6;
			// fallthrough
		case 2:
			pBytes[1] = (char)((ch | byteMark) & byteMask);
			ch >>= 6;
			// fallthrough
		case 1:
			pBytes[0] = (char)(ch | firstByteMark[bytesToWrite]);
			break;
		default:
			break;
		}

		dst += pBytes;
	}
}

static const uint32 g_windows1250ConversionTable[] = {0x20AC, 0x0081, 0x201A, 0x0083, 0x201E, 0x2026, 0x2020, 0x2021,
										 0x0088, 0x2030, 0x0160, 0x2039, 0x015A, 0x0164, 0x017D, 0x0179,
										 0x0090, 0x2018, 0x2019, 0x201C, 0x201D, 0x2022, 0x2013, 0x2014,
										 0x0098, 0x2122, 0x0161, 0x203A, 0x015B, 0x0165, 0x017E, 0x017A,
										 0x00A0, 0x02C7, 0x02D8, 0x0141, 0x00A4, 0x0104, 0x00A6, 0x00A7,
										 0x00A8, 0x00A9, 0x015E, 0x00AB, 0x00AC, 0x00AD, 0x00AE, 0x017B,
										 0x00B0, 0x00B1, 0x02DB, 0x0142, 0x00B4, 0x00B5, 0x00B6, 0x00B7,
										 0x00B8, 0x0105, 0x015F, 0x00BB, 0x013D, 0x02DD, 0x013E, 0x017C,
										 0x0154, 0x00C1, 0x00C2, 0x0102, 0x00C4, 0x0139, 0x0106, 0x00C7,
										 0x010C, 0x00C9, 0x0118, 0x00CB, 0x011A, 0x00CD, 0x00CE, 0x010E,
										 0x0110, 0x0143, 0x0147, 0x00D3, 0x00D4, 0x0150, 0x00D6, 0x00D7,
										 0x0158, 0x016E, 0x00DA, 0x0170, 0x00DC, 0x00DD, 0x0162, 0x00DF,
										 0x0155, 0x00E1, 0x00E2, 0x0103, 0x00E4, 0x013A, 0x0107, 0x00E7,
										 0x010D, 0x00E9, 0x0119, 0x00EB, 0x011B, 0x00ED, 0x00EE, 0x010F,
										 0x0111, 0x0144, 0x0148, 0x00F3, 0x00F4, 0x0151, 0x00F6, 0x00F7,
										 0x0159, 0x016F, 0x00FA, 0x0171, 0x00FC, 0x00FD, 0x0163, 0x02D9};

static const uint32 g_windows1251ConversionTable[] = {0x0402, 0x0403, 0x201A, 0x0453, 0x201E, 0x2026, 0x2020, 0x2021,
										 0x20AC, 0x2030, 0x0409, 0x2039, 0x040A, 0x040C, 0x040B, 0x040F,
										 0x0452, 0x2018, 0x2019, 0x201C, 0x201D, 0x2022, 0x2013, 0x2014,
										 0x0098, 0x2122, 0x0459, 0x203A, 0x045A, 0x045C, 0x045B, 0x045F,
										 0x00A0, 0x040E, 0x045E, 0x0408, 0x00A4, 0x0490, 0x00A6, 0x00A7,
										 0x0401, 0x00A9, 0x0404, 0x00AB, 0x00AC, 0x00AD, 0x00AE, 0x0407,
										 0x00B0, 0x00B1, 0x0406, 0x0456, 0x0491, 0x00B5, 0x00B6, 0x00B7,
										 0x0451, 0x2116, 0x0454, 0x00BB, 0x0458, 0x0405, 0x0455, 0x0457,
										 0x0410, 0x0411, 0x0412, 0x0413, 0x0414, 0x0415, 0x0416, 0x0417,
										 0x0418, 0x0419, 0x041A, 0x041B, 0x041C, 0x041D, 0x041E, 0x041F,
										 0x0420, 0x0421, 0x0422, 0x0423, 0x0424, 0x0425, 0x0426, 0x0427,
										 0x0428, 0x0429, 0x042A, 0x042B, 0x042C, 0x042D, 0x042E, 0x042F,
										 0x0430, 0x0431, 0x0432, 0x0433, 0x0434, 0x0435, 0x0436, 0x0437,
										 0x0438, 0x0439, 0x043A, 0x043B, 0x043C, 0x043D, 0x043E, 0x043F,
										 0x0440, 0x0441, 0x0442, 0x0443, 0x0444, 0x0445, 0x0446, 0x0447,
										 0x0448, 0x0449, 0x044A, 0x044B, 0x044C, 0x044D, 0x044E, 0x044F};

static const uint32 g_windows1252ConversionTable[] = {0x20AC, 0x0081, 0x201A, 0x0192, 0x201E, 0x2026, 0x2020, 0x2021,
										 0x02C6, 0x2030, 0x0160, 0x2039, 0x0152, 0x008D, 0x017D, 0x008F,
										 0x0090, 0x2018, 0x2019, 0x201C, 0x201D, 0x2022, 0x2013, 0x2014,
										 0x02DC, 0x2122, 0x0161, 0x203A, 0x0153, 0x009D, 0x017E, 0x0178,
										 0x00A0, 0x00A1, 0x00A2, 0x00A3, 0x00A4, 0x00A5, 0x00A6, 0x00A7,
										 0x00A8, 0x00A9, 0x00AA, 0x00AB, 0x00AC, 0x00AD, 0x00AE, 0x00AF,
										 0x00B0, 0x00B1, 0x00B2, 0x00B3, 0x00B4, 0x00B5, 0x00B6, 0x00B7,
										 0x00B8, 0x00B9, 0x00BA, 0x00BB, 0x00BC, 0x00BD, 0x00BE, 0x00BF,
										 0x00C0, 0x00C1, 0x00C2, 0x00C3, 0x00C4, 0x00C5, 0x00C6, 0x00C7,
										 0x00C8, 0x00C9, 0x00CA, 0x00CB, 0x00CC, 0x00CD, 0x00CE, 0x00CF,
										 0x00D0, 0x00D1, 0x00D2, 0x00D3, 0x00D4, 0x00D5, 0x00D6, 0x00D7,
										 0x00D8, 0x00D9, 0x00DA, 0x00DB, 0x00DC, 0x00DD, 0x00DE, 0x00DF,
										 0x00E0, 0x00E1, 0x00E2, 0x00E3, 0x00E4, 0x00E5, 0x00E6, 0x00E7,
										 0x00E8, 0x00E9, 0x00EA, 0x00EB, 0x00EC, 0x00ED, 0x00EE, 0x00EF,
										 0x00F0, 0x00F1, 0x00F2, 0x00F3, 0x00F4, 0x00F5, 0x00F6, 0x00F7,
										 0x00F8, 0x00F9, 0x00FA, 0x00FB, 0x00FC, 0x00FD, 0x00FE, 0x00FF};

static const uint32 g_windows1253ConversionTable[] = {0x20AC, 0x0081, 0x201A, 0x0192, 0x201E, 0x2026, 0x2020, 0x2021,
										 0x0088, 0x2030, 0x008A, 0x2039, 0x008C, 0x008D, 0x008E, 0x008F,
										 0x0090, 0x2018, 0x2019, 0x201C, 0x201D, 0x2022, 0x2013, 0x2014,
										 0x0098, 0x2122, 0x009A, 0x203A, 0x009C, 0x009D, 0x009E, 0x009F,
										 0x00A0, 0x0385, 0x0386, 0x00A3, 0x00A4, 0x00A5, 0x00A6, 0x00A7,
										 0x00A8, 0x00A9, 0x00AA, 0x00AB, 0x00AC, 0x00AD, 0x00AE, 0x2015,
										 0x00B0, 0x00B1, 0x00B2, 0x00B3, 0x0384, 0x00B5, 0x00B6, 0x00B7,
										 0x0388, 0x0389, 0x038A, 0x00BB, 0x038C, 0x00BD, 0x038E, 0x038F,
										 0x0390, 0x0391, 0x0392, 0x0393, 0x0394, 0x0395, 0x0396, 0x0397,
										 0x0398, 0x0399, 0x039A, 0x039B, 0x039C, 0x039D, 0x039E, 0x039F,
										 0x03A0, 0x03A1, 0x00D2, 0x03A3, 0x03A4, 0x03A5, 0x03A6, 0x03A7,
										 0x03A8, 0x03A9, 0x03AA, 0x03AB, 0x03AC, 0x03AD, 0x03AE, 0x03AF,
										 0x03B0, 0x03B1, 0x03B2, 0x03B3, 0x03B4, 0x03B5, 0x03B6, 0x03B7,
										 0x03B8, 0x03B9, 0x03BA, 0x03BB, 0x03BC, 0x03BD, 0x03BE, 0x03BF,
										 0x03C0, 0x03C1, 0x03C2, 0x03C3, 0x03C4, 0x03C5, 0x03C6, 0x03C7,
										 0x03C8, 0x03C9, 0x03CA, 0x03CB, 0x03CC, 0x03CD, 0x03CE, 0x00FF};

static const uint32 g_windows1254ConversionTable[] = {0x20AC, 0x0081, 0x201A, 0x0192, 0x201E, 0x2026, 0x2020, 0x2021,
										 0x02C6, 0x2030, 0x0160, 0x2039, 0x0152, 0x008D, 0x008E, 0x008F,
										 0x0090, 0x2018, 0x2019, 0x201C, 0x201D, 0x2022, 0x2013, 0x2014,
										 0x02DC, 0x2122, 0x0161, 0x203A, 0x0153, 0x009D, 0x009E, 0x0178,
										 0x00A0, 0x00A1, 0x00A2, 0x00A3, 0x00A4, 0x00A5, 0x00A6, 0x00A7,
										 0x00A8, 0x00A9, 0x00AA, 0x00AB, 0x00AC, 0x00AD, 0x00AE, 0x00AF,
										 0x00B0, 0x00B1, 0x00B2, 0x00B3, 0x00B4, 0x00B5, 0x00B6, 0x00B7,
										 0x00B8, 0x00B9, 0x00BA, 0x00BB, 0x00BC, 0x00BD, 0x00BE, 0x00BF,
										 0x00C0, 0x00C1, 0x00C2, 0x00C3, 0x00C4, 0x00C5, 0x00C6, 0x00C7,
										 0x00C8, 0x00C9, 0x00CA, 0x00CB, 0x00CC, 0x00CD, 0x00CE, 0x00CF,
										 0x011E, 0x00D1, 0x00D2, 0x00D3, 0x00D4, 0x00D5, 0x00D6, 0x00D7,
										 0x00D8, 0x00D9, 0x00DA, 0x00DB, 0x00DC, 0x0130, 0x015E, 0x00DF,
										 0x00E0, 0x00E1, 0x00E2, 0x00E3, 0x00E4, 0x00E5, 0x00E6, 0x00E7,
										 0x00E8, 0x00E9, 0x00EA, 0x00EB, 0x00EC, 0x00ED, 0x00EE, 0x00EF,
										 0x011F, 0x00F1, 0x00F2, 0x00F3, 0x00F4, 0x00F5, 0x00F6, 0x00F7,
										 0x00F8, 0x00F9, 0x00FA, 0x00FB, 0x00FC, 0x0131, 0x015F, 0x00FF};

static const uint32 g_windows1255ConversionTable[] = {0x20AC, 0x0081, 0x201A, 0x0192, 0x201E, 0x2026, 0x2020, 0x2021,
										 0x02C6, 0x2030, 0x008A, 0x2039, 0x008C, 0x008D, 0x008E, 0x008F,
										 0x0090, 0x2018, 0x2019, 0x201C, 0x201D, 0x2022, 0x2013, 0x2014,
										 0x02DC, 0x2122, 0x009A, 0x203A, 0x009C, 0x009D, 0x009E, 0x009F,
										 0x00A0, 0x00A1, 0x00A2, 0x00A3, 0x20AA, 0x00A5, 0x00A6, 0x00A7,
										 0x00A8, 0x00A9, 0x00D7, 0x00AB, 0x00AC, 0x00AD, 0x00AE, 0x00AF,
										 0x00B0, 0x00B1, 0x00B2, 0x00B3, 0x00B4, 0x00B5, 0x00B6, 0x00B7,
										 0x00B8, 0x00B9, 0x00F7, 0x00BB, 0x00BC, 0x00BD, 0x00BE, 0x00BF,
										 0x05B0, 0x05B1, 0x05B2, 0x05B3, 0x05B4, 0x05B5, 0x05B6, 0x05B7,
										 0x05B8, 0x05B9, 0x05BA, 0x05BB, 0x05BC, 0x05BD, 0x05BE, 0x05BF,
										 0x05C0, 0x05C1, 0x05C2, 0x05C3, 0x05F0, 0x05F1, 0x05F2, 0x05F3,
										 0x05F4, 0x00D9, 0x00DA, 0x00DB, 0x00DC, 0x00DD, 0x00DE, 0x00DF,
										 0x05D0, 0x05D1, 0x05D2, 0x05D3, 0x05D4, 0x05D5, 0x05D6, 0x05D7,
										 0x05D8, 0x05D9, 0x05DA, 0x05DB, 0x05DC, 0x05DD, 0x05DE, 0x05DF,
										 0x05E0, 0x05E1, 0x05E2, 0x05E3, 0x05E4, 0x05E5, 0x05E6, 0x05E7,
										 0x05E8, 0x05E9, 0x05EA, 0x00FB, 0x00FC, 0x200E, 0x200F, 0x00FF};

static const uint32 g_windows1256ConversionTable[] = {0x20AC, 0x067E, 0x201A, 0x0192, 0x201E, 0x2026, 0x2020, 0x2021,
										 0x02C6, 0x2030, 0x0679, 0x2039, 0x0152, 0x0686, 0x0698, 0x0688,
										 0x06AF, 0x2018, 0x2019, 0x201C, 0x201D, 0x2022, 0x2013, 0x2014,
										 0x06A9, 0x2122, 0x0691, 0x203A, 0x0153, 0x200C, 0x200D, 0x06BA,
										 0x00A0, 0x060C, 0x00A2, 0x00A3, 0x00A4, 0x00A5, 0x00A6, 0x00A7,
										 0x00A8, 0x00A9, 0x06BE, 0x00AB, 0x00AC, 0x00AD, 0x00AE, 0x00AF,
										 0x00B0, 0x00B1, 0x00B2, 0x00B3, 0x00B4, 0x00B5, 0x00B6, 0x00B7,
										 0x00B8, 0x00B9, 0x061B, 0x00BB, 0x00BC, 0x00BD, 0x00BE, 0x061F,
										 0x06C1, 0x0621, 0x0622, 0x0623, 0x0624, 0x0625, 0x0626, 0x0627,
										 0x0628, 0x0629, 0x062A, 0x062B, 0x062C, 0x062D, 0x062E, 0x062F,
										 0x0630, 0x0631, 0x0632, 0x0633, 0x0634, 0x0635, 0x0636, 0x00D7,
										 0x0637, 0x0638, 0x0639, 0x063A, 0x0640, 0x0641, 0x0642, 0x0643,
										 0x00E0, 0x0644, 0x00E2, 0x0645, 0x0646, 0x0647, 0x0648, 0x00E7,
										 0x00E8, 0x00E9, 0x00EA, 0x00EB, 0x0649, 0x064A, 0x00EE, 0x00EF,
										 0x064B, 0x064C, 0x064D, 0x064E, 0x00F4, 0x064F, 0x0650, 0x00F7,
										 0x0651, 0x00F9, 0x0652, 0x00FB, 0x00FC, 0x200E, 0x200F, 0x06D2};

static const uint32 g_windows1257ConversionTable[] = {0x20AC, 0x0081, 0x201A, 0x0083, 0x201E, 0x2026, 0x2020, 0x2021,
										 0x0088, 0x2030, 0x008A, 0x2039, 0x008C, 0x00A8, 0x02C7, 0x00B8,
										 0x0090, 0x2018, 0x2019, 0x201C, 0x201D, 0x2022, 0x2013, 0x2014,
										 0x0098, 0x2122, 0x009A, 0x203A, 0x009C, 0x00AF, 0x02DB, 0x009F,
										 0x00A0, 0x00A1, 0x00A2, 0x00A3, 0x00A4, 0x00A5, 0x00A6, 0x00A7,
										 0x00D8, 0x00A9, 0x0156, 0x00AB, 0x00AC, 0x00AD, 0x00AE, 0x00C6,
										 0x00B0, 0x00B1, 0x00B2, 0x00B3, 0x00B4, 0x00B5, 0x00B6, 0x00B7,
										 0x00F8, 0x00B9, 0x0157, 0x00BB, 0x00BC, 0x00BD, 0x00BE, 0x00E6,
										 0x0104, 0x012E, 0x0100, 0x0106, 0x00C4, 0x00C5, 0x0118, 0x0112,
										 0x010C, 0x00C9, 0x0179, 0x0116, 0x0122, 0x0136, 0x012A, 0x013B,
										 0x0160, 0x0143, 0x0145, 0x00D3, 0x014C, 0x00D5, 0x00D6, 0x00D7,
										 0x0172, 0x0141, 0x015A, 0x016A, 0x00DC, 0x017B, 0x017D, 0x00DF,
										 0x0105, 0x012F, 0x0101, 0x0107, 0x00E4, 0x00E5, 0x0119, 0x0113,
										 0x010D, 0x00E9, 0x017A, 0x0117, 0x0123, 0x0137, 0x012B, 0x013C,
										 0x0161, 0x0144, 0x0146, 0x00F3, 0x014D, 0x00F5, 0x00F6, 0x00F7,
										 0x0173, 0x0142, 0x015B, 0x016B, 0x00FC, 0x017C, 0x017E, 0x02D9};


/* This array must match the enum defined in str-enc.h */
static char const *const g_codePageMap[] = {
	"UTF-8", /* kUtf8 */
	"WINDOWS-1250", /* kWindows1250 */
	"WINDOWS-1251", /* kWindows1251 */
	"WINDOWS-1252", /* kWindows1252 */
	"WINDOWS-1253", /* kWindows1253 */
	"WINDOWS-1254", /* kWindows1254 */
	"WINDOWS-1255", /* kWindows1255 */
	"WINDOWS-1256", /* kWindows1256 */
	"WINDOWS-1257", /* kWindows1257 */
	"MS932", /* kWindows932 */
	"MSCP949", /* kWindows949 */
	"CP950"  /* kWindows950 */
};

void String::decodeOneByte(U32String &dst, CodePage page) const {
	for (uint i = 0; i < _size; ++i) {
		if ((byte)_str[i] <= 0x7F) {
			dst += _str[i];
			continue;
		}

		byte index = _str[i] - 0x80;

		switch (page) {
		case kWindows1250:
			dst += g_windows1250ConversionTable[index];
			break;
		case kWindows1251:
			dst += g_windows1251ConversionTable[index];
			break;
		case kWindows1252:
			dst += g_windows1252ConversionTable[index];
			break;
		case kWindows1253:
			dst += g_windows1253ConversionTable[index];
			break;
		case kWindows1254:
			dst += g_windows1254ConversionTable[index];
			break;
		case kWindows1255:
			dst += g_windows1255ConversionTable[index];
			break;
		case kWindows1256:
			dst += g_windows1256ConversionTable[index];
			break;
		case kWindows1257:
			dst += g_windows1257ConversionTable[index];
			break;
		default:
			break;
		}
	}
}

U32String String::decode(CodePage page) const {
	if (page == kCodePageInvalid ||
			page >= ARRAYSIZE(g_codePageMap)) {
		error("Invalid codepage");
	}
	char *result = Encoding::convert("UTF-32", g_codePageMap[page], _str, _size);
	if (result) {
		U32String unicodeString((uint32 *)result);
		free(result);
		return unicodeString;
	}

	U32String unicodeString;
	if (page == kUtf8) {
		decodeUTF8(unicodeString);
	} else {
		decodeOneByte(unicodeString, page);
	}
	return unicodeString;
}



void U32String::encodeOneByte(String &dst, CodePage page) const {
	const uint32 *conversionTable = NULL;
	switch (page) {
	case kWindows1250:
		conversionTable = g_windows1250ConversionTable;
		break;
	case kWindows1251:
		conversionTable = g_windows1251ConversionTable;
		break;
	case kWindows1252:
		conversionTable = g_windows1252ConversionTable;
		break;
	case kWindows1253:
		conversionTable = g_windows1253ConversionTable;
		break;
	case kWindows1254:
		conversionTable = g_windows1254ConversionTable;
		break;
	case kWindows1255:
		conversionTable = g_windows1255ConversionTable;
		break;
	case kWindows1256:
		conversionTable = g_windows1256ConversionTable;
		break;
	case kWindows1257:
		conversionTable = g_windows1257ConversionTable;
		break;
	default:
		break;
	}

	for (uint i = 0; i < _size; ++i) {
		if (_str[i] <= 0x7F) {
			dst += _str[i];
			continue;
		}

		if (!conversionTable) {
			continue;
		}

		for (uint j = 0; j < 128; ++j) {
			if (conversionTable[j] == _str[i]) {
				dst += (char)(j + 0x80);
				break;
			}
		}
	}
}


String U32String::encode(CodePage page) const {
	if (page == kCodePageInvalid ||
			page >= ARRAYSIZE(g_codePageMap)) {
		error("Invalid codepage");
	}
	char *result = Encoding::convert(g_codePageMap[page], "UTF-32", (const char *)_str, _size * 4);
	if (result) {
		// Encodings in CodePage all use '\0' as string ending
		// That would be problematic if CodePage has UTF-16 or UTF-32
		String string(result);
		free(result);
		return string;
	}

	String string;
	if (page == kUtf8) {
		encodeUTF8(string);
	} else {
		encodeOneByte(string, page);
	}
	return string;
}



U32String convertToU32String(const char *str, CodePage page) {
	return String(str).decode(page);
}

U32String convertUtf8ToUtf32(const String &str) {
	return str.decode(kUtf8);
}

String convertFromU32String(const U32String &string, CodePage page) {
	return string.encode(page);
}

String convertUtf32ToUtf8(const U32String &u32str) {
	return u32str.encode(kUtf8);
}

} // End of namespace Common