/* * Copyright (C) 2003 Apple Computer, Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #import "KWQCharsets.h" struct CharsetEntry { const char *name; CFStringEncoding encoding; KWQEncodingFlags flags; }; /* The following autogenerated file includes the charset data. */ #include "KWQCharsetData.c" static Boolean encodingNamesEqual(const void *value1, const void *value2); static CFHashCode encodingNameHash(const void *value); static const CFDictionaryKeyCallBacks encodingNameKeyCallbacks = { 0, NULL, NULL, NULL, encodingNamesEqual, encodingNameHash }; static CFMutableDictionaryRef nameToTable = NULL; static CFMutableDictionaryRef encodingToTable = NULL; static void buildDictionaries() { nameToTable = CFDictionaryCreateMutable(NULL, 0, &encodingNameKeyCallbacks, NULL); encodingToTable = CFDictionaryCreateMutable(NULL, 0, NULL, NULL); for (int i = 0; table[i].name != NULL; i++) { CFDictionaryAddValue(nameToTable, table[i].name, &table[i]); CFDictionaryAddValue(encodingToTable, reinterpret_cast<void *>(table[i].encoding), &table[i]); } } CFStringEncoding KWQCFStringEncodingFromIANACharsetName(const char *name, KWQEncodingFlags *flags) { if (nameToTable == NULL) { buildDictionaries(); } const void *value; if (!CFDictionaryGetValueIfPresent(nameToTable, name, &value)) { if (flags) { *flags = NoEncodingFlags; } return kCFStringEncodingInvalidId; } if (flags) { *flags = static_cast<const CharsetEntry *>(value)->flags; } return static_cast<const CharsetEntry *>(value)->encoding; } const char *KWQCFStringEncodingToIANACharsetName(CFStringEncoding encoding) { if (encodingToTable == NULL) { buildDictionaries(); } const void *value; if (!CFDictionaryGetValueIfPresent(encodingToTable, reinterpret_cast<void *>(encoding), &value)) { return NULL; } return static_cast<const CharsetEntry *>(value)->name; } static Boolean encodingNamesEqual(const void *value1, const void *value2) { const char *s1 = static_cast<const char *>(value1); const char *s2 = static_cast<const char *>(value2); while (1) { char c1; do { c1 = *s1++; } while (c1 && !isalnum(c1)); char c2; do { c2 = *s2++; } while (c2 && !isalnum(c2)); if (tolower(c1) != tolower(c2)) { return false; } if (!c1 || !c2) { return !c1 && !c2; } } } // Golden ratio - arbitrary start value to avoid mapping all 0's to all 0's // or anything like that. const unsigned PHI = 0x9e3779b9U; // This hash algorithm comes from: // http://burtleburtle.net/bob/hash/hashfaq.html // http://burtleburtle.net/bob/hash/doobs.html static CFHashCode encodingNameHash(const void *value) { const char *s = static_cast<const char *>(value); CFHashCode h = PHI; for (int i = 0; i != 16; ++i) { char c; do { c = *s++; } while (c && !isalnum(c)); if (!c) { break; } h += tolower(c); h += (h << 10); h ^= (h << 6); } h += (h << 3); h ^= (h >> 11); h += (h << 15); return h; }