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273 lines
6.8 KiB
C++
273 lines
6.8 KiB
C++
//
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// UTF8Encoding.cpp
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//
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// $Id: //poco/1.4/Foundation/src/UTF8Encoding.cpp#1 $
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//
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// Library: Foundation
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// Package: Text
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// Module: UTF8Encoding
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//
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// Copyright (c) 2004-2007, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// Permission is hereby granted, free of charge, to any person or organization
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// obtaining a copy of the software and accompanying documentation covered by
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// this license (the "Software") to use, reproduce, display, distribute,
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// execute, and transmit the Software, and to prepare derivative works of the
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// Software, and to permit third-parties to whom the Software is furnished to
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// do so, all subject to the following:
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//
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// The copyright notices in the Software and this entire statement, including
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// the above license grant, this restriction and the following disclaimer,
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// must be included in all copies of the Software, in whole or in part, and
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// all derivative works of the Software, unless such copies or derivative
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// works are solely in the form of machine-executable object code generated by
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// a source language processor.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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//
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#include "Poco/UTF8Encoding.h"
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#include "Poco/String.h"
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namespace Poco {
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const char* UTF8Encoding::_names[] =
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{
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"UTF-8",
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"UTF8",
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NULL
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};
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const TextEncoding::CharacterMap UTF8Encoding::_charMap =
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{
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/* 00 */ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
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/* 10 */ 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
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/* 20 */ 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
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/* 30 */ 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
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/* 40 */ 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
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/* 50 */ 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,
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/* 60 */ 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
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/* 70 */ 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f,
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/* 80 */ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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/* 90 */ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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/* a0 */ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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/* b0 */ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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/* c0 */ -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
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/* d0 */ -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
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/* e0 */ -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3,
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/* f0 */ -4, -4, -4, -4, -4, -4, -4, -4, -5, -5, -5, -5, -6, -6, -1, -1,
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};
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UTF8Encoding::UTF8Encoding()
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{
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}
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UTF8Encoding::~UTF8Encoding()
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{
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}
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const char* UTF8Encoding::canonicalName() const
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{
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return _names[0];
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}
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bool UTF8Encoding::isA(const std::string& encodingName) const
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{
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for (const char** name = _names; *name; ++name)
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{
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if (Poco::icompare(encodingName, *name) == 0)
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return true;
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}
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return false;
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}
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const TextEncoding::CharacterMap& UTF8Encoding::characterMap() const
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{
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return _charMap;
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}
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int UTF8Encoding::convert(const unsigned char* bytes) const
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{
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int n = _charMap[*bytes];
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int uc;
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switch (n)
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{
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case -6:
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case -5:
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case -1:
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return -1;
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case -4:
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case -3:
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case -2:
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if (!isLegal(bytes, -n)) return -1;
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uc = *bytes & ((0x07 << (n + 4)) | 0x03);
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break;
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default:
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return n;
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}
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while (n++ < -1)
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{
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uc <<= 6;
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uc |= (*++bytes & 0x3F);
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}
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return uc;
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}
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int UTF8Encoding::convert(int ch, unsigned char* bytes, int length) const
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{
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if (ch <= 0x7F)
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{
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if (bytes && length >= 1)
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*bytes = (unsigned char) ch;
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return 1;
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}
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else if (ch <= 0x7FF)
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{
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if (bytes && length >= 2)
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{
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*bytes++ = (unsigned char) (((ch >> 6) & 0x1F) | 0xC0);
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*bytes = (unsigned char) ((ch & 0x3F) | 0x80);
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}
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return 2;
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}
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else if (ch <= 0xFFFF)
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{
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if (bytes && length >= 3)
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{
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*bytes++ = (unsigned char) (((ch >> 12) & 0x0F) | 0xE0);
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*bytes++ = (unsigned char) (((ch >> 6) & 0x3F) | 0x80);
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*bytes = (unsigned char) ((ch & 0x3F) | 0x80);
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}
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return 3;
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}
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else if (ch <= 0x10FFFF)
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{
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if (bytes && length >= 4)
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{
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*bytes++ = (unsigned char) (((ch >> 18) & 0x07) | 0xF0);
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*bytes++ = (unsigned char) (((ch >> 12) & 0x3F) | 0x80);
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*bytes++ = (unsigned char) (((ch >> 6) & 0x3F) | 0x80);
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*bytes = (unsigned char) ((ch & 0x3F) | 0x80);
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}
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return 4;
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}
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else return 0;
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}
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int UTF8Encoding::queryConvert(const unsigned char* bytes, int length) const
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{
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int n = _charMap[*bytes];
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int uc;
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if (-n > length)
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{
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return n;
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}
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else
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{
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switch (n)
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{
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case -6:
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case -5:
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case -1:
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return -1;
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case -4:
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case -3:
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case -2:
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if (!isLegal(bytes, -n)) return -1;
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uc = *bytes & ((0x07 << (n + 4)) | 0x03);
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break;
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default:
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return n;
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}
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while (n++ < -1)
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{
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uc <<= 6;
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uc |= (*++bytes & 0x3F);
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}
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return uc;
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}
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}
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int UTF8Encoding::sequenceLength(const unsigned char* bytes, int length) const
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{
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if (1 <= length)
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{
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int cc = _charMap[*bytes];
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if (cc >= 0)
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return 1;
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else
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return -cc;
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}
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else return -1;
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}
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bool UTF8Encoding::isLegal(const unsigned char *bytes, int length)
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{
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// Note: The following is loosely based on the isLegalUTF8 function
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// from ftp://ftp.unicode.org/Public/PROGRAMS/CVTUTF/ConvertUTF.c
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// Excuse the ugliness...
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if (0 == bytes || 0 == length) return false;
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unsigned char a;
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const unsigned char* srcptr = bytes + length;
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switch (length)
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{
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default:
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return false;
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// Everything else falls through when true.
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case 4:
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if ((a = (*--srcptr)) < 0x80 || a > 0xBF) return false;
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case 3:
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if ((a = (*--srcptr)) < 0x80 || a > 0xBF) return false;
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case 2:
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if ((a = (*--srcptr)) > 0xBF) return false;
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switch (*bytes)
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{
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case 0xE0:
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if (a < 0xA0) return false;
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break;
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case 0xED:
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if (a > 0x9F) return false;
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break;
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case 0xF0:
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if (a < 0x90) return false;
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break;
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case 0xF4:
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if (a > 0x8F) return false;
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break;
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default:
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if (a < 0x80) return false;
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}
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case 1:
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if (*bytes >= 0x80 && *bytes < 0xC2) return false;
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}
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return *bytes <= 0xF4;
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}
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} // namespace Poco
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