author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 11 May 2010 17:13:44 +0300 | |
branch | RCL_3 |
changeset 70 | 8bfb9186a8b8 |
parent 17 | c8a366e56285 |
permissions | -rw-r--r-- |
0
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/* |
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* Copyright (C) 2006, 2007 Apple Inc. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* |
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* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY |
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR |
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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#include "TextEncodingRegistry.h" |
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|
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#include "PlatformString.h" |
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#include "TextCodecLatin1.h" |
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#include "TextCodecUTF16.h" |
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#include <ctype.h> |
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#include <wtf/Assertions.h> |
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#include <wtf/HashMap.h> |
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#if USE(ICU_UNICODE) |
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#include "TextCodecICU.h" |
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#endif |
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#if PLATFORM(MAC) |
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#include "TextCodecMac.h" |
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#endif |
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#if PLATFORM(QT) |
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#include "qt/TextCodecQt.h" |
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#endif |
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#if PLATFORM(SYMBIAN) |
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#include "StreamingTextCodecSymbian.h" |
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#endif |
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|
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namespace WebCore { |
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|
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const size_t maxEncodingNameLength = 63; |
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|
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// Hash for all-ASCII strings that does case folding and skips any characters |
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// that are not alphanumeric. If passed any non-ASCII characters, depends on |
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// the behavior of isalnum -- if that returns false as it does on OS X, then |
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// it will properly skip those characters too. |
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struct TextEncodingNameHash { |
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|
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// Golden ratio - arbitrary start value to avoid mapping all 0's to all 0's |
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// or anything like that. |
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static const unsigned PHI = 0x9e3779b9U; |
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|
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static bool equal(const char* s1, const char* s2) |
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{ |
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char c1; |
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char c2; |
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do { |
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do |
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c1 = *s1++; |
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while (c1 && !isalnum(c1)); |
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do |
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c2 = *s2++; |
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while (c2 && !isalnum(c2)); |
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if (tolower(c1) != tolower(c2)) |
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return false; |
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} while (c1 && c2); |
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return !c1 && !c2; |
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} |
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|
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// This algorithm is the one-at-a-time hash from: |
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// http://burtleburtle.net/bob/hash/hashfaq.html |
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// http://burtleburtle.net/bob/hash/doobs.html |
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static unsigned hash(const char* s) |
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{ |
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unsigned h = PHI; |
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for (;;) { |
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char c; |
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do { |
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c = *s++; |
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if (!c) { |
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h += (h << 3); |
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h ^= (h >> 11); |
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h += (h << 15); |
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return h; |
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} |
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} while (!isalnum(c)); |
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h += tolower(c); |
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h += (h << 10); |
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h ^= (h >> 6); |
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} |
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} |
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|
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}; |
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|
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struct TextCodecFactory { |
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NewTextCodecFunction function; |
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const void* additionalData; |
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TextCodecFactory(NewTextCodecFunction f = 0, const void* d = 0) : function(f), additionalData(d) { } |
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}; |
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110 |
|
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typedef HashMap<const char*, const char*, TextEncodingNameHash> TextEncodingNameMap; |
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typedef HashMap<const char*, TextCodecFactory> TextCodecMap; |
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113 |
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static TextEncodingNameMap* textEncodingNameMap; |
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static TextCodecMap* textCodecMap; |
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static bool didExtendTextCodecMaps; |
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117 |
|
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#if ERROR_DISABLED |
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119 |
|
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static inline void checkExistingName(const char*, const char*) { } |
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121 |
|
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#else |
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123 |
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static void checkExistingName(const char* alias, const char* atomicName) |
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{ |
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const char* oldAtomicName = textEncodingNameMap->get(alias); |
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if (!oldAtomicName) |
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return; |
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if (oldAtomicName == atomicName) |
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return; |
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// Keep the warning silent about one case where we know this will happen. |
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if (strcmp(alias, "ISO-8859-8-I") == 0 |
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&& strcmp(oldAtomicName, "ISO-8859-8-I") == 0 |
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&& strcmp(atomicName, "ISO_8859-8:1988") == 0) |
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return; |
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LOG_ERROR("alias %s maps to %s already, but someone is trying to make it map to %s", |
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alias, oldAtomicName, atomicName); |
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} |
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139 |
|
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#endif |
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141 |
|
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static void addToTextEncodingNameMap(const char* alias, const char* name) |
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143 |
{ |
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ASSERT(strlen(alias) <= maxEncodingNameLength); |
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const char* atomicName = textEncodingNameMap->get(name); |
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ASSERT(strcmp(alias, name) == 0 || atomicName); |
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if (!atomicName) |
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atomicName = name; |
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checkExistingName(alias, atomicName); |
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textEncodingNameMap->add(alias, atomicName); |
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} |
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152 |
|
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static void addToTextCodecMap(const char* name, NewTextCodecFunction function, const void* additionalData) |
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154 |
{ |
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TextEncoding encoding(name); |
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ASSERT(encoding.isValid()); |
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textCodecMap->add(encoding.name(), TextCodecFactory(function, additionalData)); |
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} |
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159 |
|
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static void buildBaseTextCodecMaps() |
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161 |
{ |
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textCodecMap = new TextCodecMap; |
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textEncodingNameMap = new TextEncodingNameMap; |
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164 |
|
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TextCodecLatin1::registerEncodingNames(addToTextEncodingNameMap); |
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TextCodecLatin1::registerCodecs(addToTextCodecMap); |
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167 |
|
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TextCodecUTF16::registerEncodingNames(addToTextEncodingNameMap); |
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TextCodecUTF16::registerCodecs(addToTextCodecMap); |
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170 |
|
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#if USE(ICU_UNICODE)&& !USE(SYMBIAN_UNICODE) |
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TextCodecICU::registerBaseEncodingNames(addToTextEncodingNameMap); |
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TextCodecICU::registerBaseCodecs(addToTextCodecMap); |
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#endif |
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#if PLATFORM(SYMBIAN) |
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// ICU codecs uses too much memory. |
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// we have to fall back to Symbian codecs. |
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TextCodecSymbian::registerEncodingNames(addToTextEncodingNameMap); |
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TextCodecSymbian::registerCodecs(addToTextCodecMap); |
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#endif |
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181 |
|
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182 |
} |
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183 |
|
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static void extendTextCodecMaps() |
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185 |
{ |
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#if USE(ICU_UNICODE) && !USE(SYMBIAN_UNICODE) |
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TextCodecICU::registerExtendedEncodingNames(addToTextEncodingNameMap); |
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TextCodecICU::registerExtendedCodecs(addToTextCodecMap); |
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189 |
#endif |
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190 |
|
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#if USE(QT4_UNICODE) |
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TextCodecQt::registerEncodingNames(addToTextEncodingNameMap); |
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TextCodecQt::registerCodecs(addToTextCodecMap); |
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194 |
#endif |
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195 |
|
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#if PLATFORM(MAC) |
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TextCodecMac::registerEncodingNames(addToTextEncodingNameMap); |
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TextCodecMac::registerCodecs(addToTextCodecMap); |
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199 |
#endif |
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200 |
#if PLATFORM(SYMBIAN) |
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// use Symbian OS codecs |
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TextCodecSymbian::registerEncodingNames(addToTextEncodingNameMap); |
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203 |
TextCodecSymbian::registerCodecs(addToTextCodecMap); |
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204 |
#endif |
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205 |
} |
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206 |
|
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std::auto_ptr<TextCodec> newTextCodec(const TextEncoding& encoding) |
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208 |
{ |
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ASSERT(textCodecMap); |
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TextCodecFactory factory = textCodecMap->get(encoding.name()); |
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ASSERT(factory.function); |
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return factory.function(encoding, factory.additionalData); |
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} |
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214 |
|
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215 |
const char* atomicCanonicalTextEncodingName(const char* name) |
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{ |
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if (!name || !name[0]) |
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return 0; |
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if (!textEncodingNameMap) |
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buildBaseTextCodecMaps(); |
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if (const char* atomicName = textEncodingNameMap->get(name)) |
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return atomicName; |
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if (didExtendTextCodecMaps) |
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return 0; |
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extendTextCodecMaps(); |
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didExtendTextCodecMaps = true; |
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return textEncodingNameMap->get(name); |
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} |
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229 |
|
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const char* atomicCanonicalTextEncodingName(const UChar* characters, size_t length) |
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{ |
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char buffer[maxEncodingNameLength + 1]; |
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size_t j = 0; |
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for (size_t i = 0; i < length; ++i) { |
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UChar c = characters[i]; |
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if (isalnum(c)) { |
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if (j == maxEncodingNameLength) |
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return 0; |
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buffer[j++] = c; |
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} |
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} |
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buffer[j] = 0; |
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return atomicCanonicalTextEncodingName(buffer); |
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} |
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|
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bool noExtendedTextEncodingNameUsed() |
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{ |
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return !didExtendTextCodecMaps; |
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} |
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|
17
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|
13 | 252 |
#if PLATFORM(SYMBIAN) |
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struct cleanupEncodingMaps { |
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~cleanupEncodingMaps() { |
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if( textEncodingNameMap ) { |
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textEncodingNameMap->clear(); |
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delete textEncodingNameMap; |
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textEncodingNameMap = NULL; |
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} |
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if( textCodecMap ) { |
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textCodecMap->clear(); |
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delete textCodecMap; |
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textCodecMap = NULL; |
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} |
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didExtendTextCodecMaps = false; |
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} |
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}; |
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struct cleanupEncodingMaps encodingMaps; |
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#endif |
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||
0
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} // namespace WebCore |