1/*
2 * Copyright (C) 2004, 2006, 2008 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "TextCodecLatin1.h"
28
29#include "PlatformString.h"
30#include "TextCodecASCIIFastPath.h"
31#include <wtf/text/CString.h>
32#include <wtf/text/StringBuffer.h>
33#include <wtf/PassOwnPtr.h>
34
35namespace WebCore {
36
37static const UChar table[256] = {
38    0x0000, 0x0001, 0x0002, 0x0003, 0x0004, 0x0005, 0x0006, 0x0007, // 00-07
39    0x0008, 0x0009, 0x000A, 0x000B, 0x000C, 0x000D, 0x000E, 0x000F, // 08-0F
40    0x0010, 0x0011, 0x0012, 0x0013, 0x0014, 0x0015, 0x0016, 0x0017, // 10-17
41    0x0018, 0x0019, 0x001A, 0x001B, 0x001C, 0x001D, 0x001E, 0x001F, // 18-1F
42    0x0020, 0x0021, 0x0022, 0x0023, 0x0024, 0x0025, 0x0026, 0x0027, // 20-27
43    0x0028, 0x0029, 0x002A, 0x002B, 0x002C, 0x002D, 0x002E, 0x002F, // 28-2F
44    0x0030, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035, 0x0036, 0x0037, // 30-37
45    0x0038, 0x0039, 0x003A, 0x003B, 0x003C, 0x003D, 0x003E, 0x003F, // 38-3F
46    0x0040, 0x0041, 0x0042, 0x0043, 0x0044, 0x0045, 0x0046, 0x0047, // 40-47
47    0x0048, 0x0049, 0x004A, 0x004B, 0x004C, 0x004D, 0x004E, 0x004F, // 48-4F
48    0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056, 0x0057, // 50-57
49    0x0058, 0x0059, 0x005A, 0x005B, 0x005C, 0x005D, 0x005E, 0x005F, // 58-5F
50    0x0060, 0x0061, 0x0062, 0x0063, 0x0064, 0x0065, 0x0066, 0x0067, // 60-67
51    0x0068, 0x0069, 0x006A, 0x006B, 0x006C, 0x006D, 0x006E, 0x006F, // 68-6F
52    0x0070, 0x0071, 0x0072, 0x0073, 0x0074, 0x0075, 0x0076, 0x0077, // 70-77
53    0x0078, 0x0079, 0x007A, 0x007B, 0x007C, 0x007D, 0x007E, 0x007F, // 78-7F
54    0x20AC, 0x0081, 0x201A, 0x0192, 0x201E, 0x2026, 0x2020, 0x2021, // 80-87
55    0x02C6, 0x2030, 0x0160, 0x2039, 0x0152, 0x008D, 0x017D, 0x008F, // 88-8F
56    0x0090, 0x2018, 0x2019, 0x201C, 0x201D, 0x2022, 0x2013, 0x2014, // 90-97
57    0x02DC, 0x2122, 0x0161, 0x203A, 0x0153, 0x009D, 0x017E, 0x0178, // 98-9F
58    0x00A0, 0x00A1, 0x00A2, 0x00A3, 0x00A4, 0x00A5, 0x00A6, 0x00A7, // A0-A7
59    0x00A8, 0x00A9, 0x00AA, 0x00AB, 0x00AC, 0x00AD, 0x00AE, 0x00AF, // A8-AF
60    0x00B0, 0x00B1, 0x00B2, 0x00B3, 0x00B4, 0x00B5, 0x00B6, 0x00B7, // B0-B7
61    0x00B8, 0x00B9, 0x00BA, 0x00BB, 0x00BC, 0x00BD, 0x00BE, 0x00BF, // B8-BF
62    0x00C0, 0x00C1, 0x00C2, 0x00C3, 0x00C4, 0x00C5, 0x00C6, 0x00C7, // C0-C7
63    0x00C8, 0x00C9, 0x00CA, 0x00CB, 0x00CC, 0x00CD, 0x00CE, 0x00CF, // C8-CF
64    0x00D0, 0x00D1, 0x00D2, 0x00D3, 0x00D4, 0x00D5, 0x00D6, 0x00D7, // D0-D7
65    0x00D8, 0x00D9, 0x00DA, 0x00DB, 0x00DC, 0x00DD, 0x00DE, 0x00DF, // D8-DF
66    0x00E0, 0x00E1, 0x00E2, 0x00E3, 0x00E4, 0x00E5, 0x00E6, 0x00E7, // E0-E7
67    0x00E8, 0x00E9, 0x00EA, 0x00EB, 0x00EC, 0x00ED, 0x00EE, 0x00EF, // E8-EF
68    0x00F0, 0x00F1, 0x00F2, 0x00F3, 0x00F4, 0x00F5, 0x00F6, 0x00F7, // F0-F7
69    0x00F8, 0x00F9, 0x00FA, 0x00FB, 0x00FC, 0x00FD, 0x00FE, 0x00FF  // F8-FF
70};
71
72void TextCodecLatin1::registerEncodingNames(EncodingNameRegistrar registrar)
73{
74    registrar("windows-1252", "windows-1252");
75    registrar("ISO-8859-1", "ISO-8859-1");
76    registrar("US-ASCII", "US-ASCII");
77
78    registrar("WinLatin1", "windows-1252");
79    registrar("ibm-1252", "windows-1252");
80    registrar("ibm-1252_P100-2000", "windows-1252");
81
82    registrar("CP819", "ISO-8859-1");
83    registrar("IBM819", "ISO-8859-1");
84    registrar("csISOLatin1", "ISO-8859-1");
85    registrar("iso-ir-100", "ISO-8859-1");
86    registrar("iso_8859-1:1987", "ISO-8859-1");
87    registrar("l1", "ISO-8859-1");
88    registrar("latin1", "ISO-8859-1");
89
90    registrar("ANSI_X3.4-1968", "US-ASCII");
91    registrar("ANSI_X3.4-1986", "US-ASCII");
92    registrar("ASCII", "US-ASCII");
93    registrar("IBM367", "US-ASCII");
94    registrar("ISO646-US", "US-ASCII");
95    registrar("ISO_646.irv:1991", "US-ASCII");
96    registrar("cp367", "US-ASCII");
97    registrar("csASCII", "US-ASCII");
98    registrar("ibm-367_P100-1995", "US-ASCII");
99    registrar("iso-ir-6", "US-ASCII");
100    registrar("iso-ir-6-us", "US-ASCII");
101    registrar("us", "US-ASCII");
102    registrar("x-ansi", "US-ASCII");
103}
104
105static PassOwnPtr<TextCodec> newStreamingTextDecoderWindowsLatin1(const TextEncoding&, const void*)
106{
107    return new TextCodecLatin1;
108}
109
110void TextCodecLatin1::registerCodecs(TextCodecRegistrar registrar)
111{
112    registrar("windows-1252", newStreamingTextDecoderWindowsLatin1, 0);
113
114    // ASCII and Latin-1 both decode as Windows Latin-1 although they retain unique identities.
115    registrar("ISO-8859-1", newStreamingTextDecoderWindowsLatin1, 0);
116    registrar("US-ASCII", newStreamingTextDecoderWindowsLatin1, 0);
117}
118
119String TextCodecLatin1::decode(const char* bytes, size_t length, bool, bool, bool&)
120{
121    UChar* characters;
122    String result = String::createUninitialized(length, characters);
123
124    const uint8_t* source = reinterpret_cast<const uint8_t*>(bytes);
125    const uint8_t* end = reinterpret_cast<const uint8_t*>(bytes + length);
126    const uint8_t* alignedEnd = alignToMachineWord(end);
127    UChar* destination = characters;
128
129    while (source < end) {
130        if (isASCII(*source)) {
131            // Fast path for ASCII. Most Latin-1 text will be ASCII.
132            if (isAlignedToMachineWord(source)) {
133                while (source < alignedEnd) {
134                    MachineWord chunk = *reinterpret_cast_ptr<const MachineWord*>(source);
135
136                    if (!isAllASCII(chunk))
137                        goto useLookupTable;
138
139                    copyASCIIMachineWord(destination, source);
140                    source += sizeof(MachineWord);
141                    destination += sizeof(MachineWord);
142                }
143
144                if (source == end)
145                    break;
146            }
147            *destination = *source;
148        } else {
149useLookupTable:
150            *destination = table[*source];
151        }
152
153        ++source;
154        ++destination;
155    }
156
157    return result;
158}
159
160static CString encodeComplexWindowsLatin1(const UChar* characters, size_t length, UnencodableHandling handling)
161{
162    Vector<char> result(length);
163    char* bytes = result.data();
164
165    size_t resultLength = 0;
166    for (size_t i = 0; i < length; ) {
167        UChar32 c;
168        U16_NEXT(characters, i, length, c);
169        unsigned char b = c;
170        // Do an efficient check to detect characters other than 00-7F and A0-FF.
171        if (b != c || (c & 0xE0) == 0x80) {
172            // Look for a way to encode this with Windows Latin-1.
173            for (b = 0x80; b < 0xA0; ++b)
174                if (table[b] == c)
175                    goto gotByte;
176            // No way to encode this character with Windows Latin-1.
177            UnencodableReplacementArray replacement;
178            int replacementLength = TextCodec::getUnencodableReplacement(c, handling, replacement);
179            result.grow(resultLength + replacementLength + length - i);
180            bytes = result.data();
181            memcpy(bytes + resultLength, replacement, replacementLength);
182            resultLength += replacementLength;
183            continue;
184        }
185    gotByte:
186        bytes[resultLength++] = b;
187    }
188
189    return CString(bytes, resultLength);
190}
191
192CString TextCodecLatin1::encode(const UChar* characters, size_t length, UnencodableHandling handling)
193{
194    {
195        char* bytes;
196        CString string = CString::newUninitialized(length, bytes);
197
198        // Convert the string a fast way and simultaneously do an efficient check to see if it's all ASCII.
199        UChar ored = 0;
200        for (size_t i = 0; i < length; ++i) {
201            UChar c = characters[i];
202            bytes[i] = c;
203            ored |= c;
204        }
205
206        if (!(ored & 0xFF80))
207            return string;
208    }
209
210    // If it wasn't all ASCII, call the function that handles more-complex cases.
211    return encodeComplexWindowsLatin1(characters, length, handling);
212}
213
214} // namespace WebCore
215