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HTMLEncoding.m
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// HTMLEncoding.m
//
// Public domain. https://github.com/nolanw/HTMLReader
#import "HTMLEncoding+Private.h"
/**
* Returns the name of an encoding given by a label, as specified in the WHATWG Encoding standard, or nil if the label has no associated name.
*
* For more information, see https://encoding.spec.whatwg.org/#names-and-labels
*/
static NSString * NamedEncodingForLabel(NSString *label);
/**
* Returns the string encoding given by a name from the WHATWG Encoding Standard, or the result of HTMLInvalidStringEncoding() if there is no known encoding given by name.
*/
static NSStringEncoding StringEncodingForName(NSString *name);
HTMLStringEncoding DeterminedStringEncodingForData(NSData *data, NSString *contentType, NSString **outDecodedString)
{
unsigned char buffer[3] = {0};
[data getBytes:buffer length:MIN(data.length, 3U)];
if (buffer[0] == 0xFE && buffer[1] == 0xFF) {
NSString *decodedString = [[NSString alloc] initWithData:data encoding:NSUTF16BigEndianStringEncoding];
if (decodedString) {
*outDecodedString = decodedString;
return (HTMLStringEncoding){
.encoding = NSUTF16BigEndianStringEncoding,
.confidence = Certain
};
}
} else if (buffer[0] == 0xFF && buffer[1] == 0xFE) {
NSString *decodedString = [[NSString alloc] initWithData:data encoding:NSUTF16LittleEndianStringEncoding];
if (decodedString) {
*outDecodedString = decodedString;
return (HTMLStringEncoding){
.encoding = NSUTF16LittleEndianStringEncoding,
.confidence = Certain
};
}
} else if (buffer[0] == 0xEF && buffer[1] == 0xBB && buffer[2] == 0xBF) {
NSString *decodedString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
if (decodedString) {
*outDecodedString = decodedString;
return (HTMLStringEncoding){
.encoding = NSUTF8StringEncoding,
.confidence = Certain
};
}
}
if (contentType) {
// http://tools.ietf.org/html/rfc7231#section-3.1.1.1
NSScanner *scanner = [NSScanner scannerWithString:contentType];
[scanner scanUpToString:@"charset=" intoString:nil];
if ([scanner scanString:@"charset=" intoString:nil]) {
[scanner scanString:@"\"" intoString:nil];
NSString *encodingLabel;
if ([scanner scanUpToString:@"\"" intoString:&encodingLabel]) {
NSStringEncoding encoding = HTMLStringEncodingForLabel(encodingLabel);
if (encoding != HTMLInvalidStringEncoding()) {
NSString *decodedString = [[NSString alloc] initWithData:data encoding:encoding];
if (decodedString) {
*outDecodedString = decodedString;
return (HTMLStringEncoding){
.encoding = encoding,
.confidence = Certain
};
}
}
}
}
}
// TODO Prescan?
// TODO There's a table down in step 9 of https://html.spec.whatwg.org/multipage/syntax.html#documentEncoding that describes default encodings based on the current locale. Maybe implement that.
// https://encoding.spec.whatwg.org/index-windows-1252.txt maps the unused positions to control code points. html5lib-python maps to U+FFFD REPLACEMENT CHARACTER. NSString's usual decoding of win1252 rejects unused positions entirely. If we can convince NSString to do a lossy conversion, that matches html5lib-python and seems close enough.
if (UsesLossyWindows1252Decoding()) {
NSString *win1252;
NSDictionary *encodingOptions = @{
NSStringEncodingDetectionSuggestedEncodingsKey: @[@(NSWindowsCP1252StringEncoding)],
NSStringEncodingDetectionUseOnlySuggestedEncodingsKey: @YES,
};
NSStringEncoding result = [NSString stringEncodingForData:data
encodingOptions:encodingOptions
convertedString:&win1252
usedLossyConversion:nil];
// This is not expected or known to fail, but let's check anyway.
if (result != 0) {
*outDecodedString = win1252;
return (HTMLStringEncoding){
.encoding = NSWindowsCP1252StringEncoding,
.confidence = Tentative
};
}
} else {
// win1252 has some unused positions that NSString rejects, so it's not a guarantee that it'll work.
NSString *win1252 = [[NSString alloc] initWithData:data encoding:NSWindowsCP1252StringEncoding];
if (win1252) {
*outDecodedString = win1252;
return (HTMLStringEncoding){
.encoding = NSWindowsCP1252StringEncoding,
.confidence = Tentative
};
}
}
// iso8859-1 is the closest analog to win1252 that always decodes.
*outDecodedString = [[NSString alloc] initWithData:data encoding:NSISOLatin1StringEncoding];
return (HTMLStringEncoding){
.encoding = NSISOLatin1StringEncoding,
.confidence = Tentative
};
}
typedef struct {
__unsafe_unretained NSString *label;
__unsafe_unretained NSString *name;
} EncodingLabelMap;
// This array is generated by the Encoding Labeler utility. Please don't make adjustments here.
static const EncodingLabelMap EncodingLabels[] = {
{ @"866", @"IBM866" },
{ @"ansi_x3.4-1968", @"windows-1252" },
{ @"arabic", @"ISO-8859-6" },
{ @"ascii", @"windows-1252" },
{ @"asmo-708", @"ISO-8859-6" },
{ @"big5", @"Big5" },
{ @"big5-hkscs", @"Big5" },
{ @"chinese", @"GBK" },
{ @"cn-big5", @"Big5" },
{ @"cp1250", @"windows-1250" },
{ @"cp1251", @"windows-1251" },
{ @"cp1252", @"windows-1252" },
{ @"cp1253", @"windows-1253" },
{ @"cp1254", @"windows-1254" },
{ @"cp1255", @"windows-1255" },
{ @"cp1256", @"windows-1256" },
{ @"cp1257", @"windows-1257" },
{ @"cp1258", @"windows-1258" },
{ @"cp819", @"windows-1252" },
{ @"cp866", @"IBM866" },
{ @"csbig5", @"Big5" },
{ @"cseuckr", @"EUC-KR" },
{ @"cseucpkdfmtjapanese", @"EUC-JP" },
{ @"csgb2312", @"GBK" },
{ @"csibm866", @"IBM866" },
{ @"csiso2022jp", @"ISO-2022-JP" },
{ @"csiso2022kr", @"replacement" },
{ @"csiso58gb231280", @"GBK" },
{ @"csiso88596e", @"ISO-8859-6" },
{ @"csiso88596i", @"ISO-8859-6" },
{ @"csiso88598e", @"ISO-8859-8" },
{ @"csiso88598i", @"ISO-8859-8-I" },
{ @"csisolatin1", @"windows-1252" },
{ @"csisolatin2", @"ISO-8859-2" },
{ @"csisolatin3", @"ISO-8859-3" },
{ @"csisolatin4", @"ISO-8859-4" },
{ @"csisolatin5", @"windows-1254" },
{ @"csisolatin6", @"ISO-8859-10" },
{ @"csisolatin9", @"ISO-8859-15" },
{ @"csisolatinarabic", @"ISO-8859-6" },
{ @"csisolatincyrillic", @"ISO-8859-5" },
{ @"csisolatingreek", @"ISO-8859-7" },
{ @"csisolatinhebrew", @"ISO-8859-8" },
{ @"cskoi8r", @"KOI8-R" },
{ @"csksc56011987", @"EUC-KR" },
{ @"csmacintosh", @"macintosh" },
{ @"csshiftjis", @"Shift_JIS" },
{ @"cyrillic", @"ISO-8859-5" },
{ @"dos-874", @"windows-874" },
{ @"ecma-114", @"ISO-8859-6" },
{ @"ecma-118", @"ISO-8859-7" },
{ @"elot_928", @"ISO-8859-7" },
{ @"euc-jp", @"EUC-JP" },
{ @"euc-kr", @"EUC-KR" },
{ @"gb18030", @"gb18030" },
{ @"gb2312", @"GBK" },
{ @"gb_2312", @"GBK" },
{ @"gb_2312-80", @"GBK" },
{ @"gbk", @"GBK" },
{ @"greek", @"ISO-8859-7" },
{ @"greek8", @"ISO-8859-7" },
{ @"hebrew", @"ISO-8859-8" },
{ @"hz-gb-2312", @"replacement" },
{ @"ibm819", @"windows-1252" },
{ @"ibm866", @"IBM866" },
{ @"iso-2022-cn", @"replacement" },
{ @"iso-2022-cn-ext", @"replacement" },
{ @"iso-2022-jp", @"ISO-2022-JP" },
{ @"iso-2022-kr", @"replacement" },
{ @"iso-8859-1", @"windows-1252" },
{ @"iso-8859-10", @"ISO-8859-10" },
{ @"iso-8859-11", @"windows-874" },
{ @"iso-8859-13", @"ISO-8859-13" },
{ @"iso-8859-14", @"ISO-8859-14" },
{ @"iso-8859-15", @"ISO-8859-15" },
{ @"iso-8859-16", @"ISO-8859-16" },
{ @"iso-8859-2", @"ISO-8859-2" },
{ @"iso-8859-3", @"ISO-8859-3" },
{ @"iso-8859-4", @"ISO-8859-4" },
{ @"iso-8859-5", @"ISO-8859-5" },
{ @"iso-8859-6", @"ISO-8859-6" },
{ @"iso-8859-6-e", @"ISO-8859-6" },
{ @"iso-8859-6-i", @"ISO-8859-6" },
{ @"iso-8859-7", @"ISO-8859-7" },
{ @"iso-8859-8", @"ISO-8859-8" },
{ @"iso-8859-8-e", @"ISO-8859-8" },
{ @"iso-8859-8-i", @"ISO-8859-8-I" },
{ @"iso-8859-9", @"windows-1254" },
{ @"iso-ir-100", @"windows-1252" },
{ @"iso-ir-101", @"ISO-8859-2" },
{ @"iso-ir-109", @"ISO-8859-3" },
{ @"iso-ir-110", @"ISO-8859-4" },
{ @"iso-ir-126", @"ISO-8859-7" },
{ @"iso-ir-127", @"ISO-8859-6" },
{ @"iso-ir-138", @"ISO-8859-8" },
{ @"iso-ir-144", @"ISO-8859-5" },
{ @"iso-ir-148", @"windows-1254" },
{ @"iso-ir-149", @"EUC-KR" },
{ @"iso-ir-157", @"ISO-8859-10" },
{ @"iso-ir-58", @"GBK" },
{ @"iso8859-1", @"windows-1252" },
{ @"iso8859-10", @"ISO-8859-10" },
{ @"iso8859-11", @"windows-874" },
{ @"iso8859-13", @"ISO-8859-13" },
{ @"iso8859-14", @"ISO-8859-14" },
{ @"iso8859-15", @"ISO-8859-15" },
{ @"iso8859-2", @"ISO-8859-2" },
{ @"iso8859-3", @"ISO-8859-3" },
{ @"iso8859-4", @"ISO-8859-4" },
{ @"iso8859-5", @"ISO-8859-5" },
{ @"iso8859-6", @"ISO-8859-6" },
{ @"iso8859-7", @"ISO-8859-7" },
{ @"iso8859-8", @"ISO-8859-8" },
{ @"iso8859-9", @"windows-1254" },
{ @"iso88591", @"windows-1252" },
{ @"iso885910", @"ISO-8859-10" },
{ @"iso885911", @"windows-874" },
{ @"iso885913", @"ISO-8859-13" },
{ @"iso885914", @"ISO-8859-14" },
{ @"iso885915", @"ISO-8859-15" },
{ @"iso88592", @"ISO-8859-2" },
{ @"iso88593", @"ISO-8859-3" },
{ @"iso88594", @"ISO-8859-4" },
{ @"iso88595", @"ISO-8859-5" },
{ @"iso88596", @"ISO-8859-6" },
{ @"iso88597", @"ISO-8859-7" },
{ @"iso88598", @"ISO-8859-8" },
{ @"iso88599", @"windows-1254" },
{ @"iso_8859-1", @"windows-1252" },
{ @"iso_8859-15", @"ISO-8859-15" },
{ @"iso_8859-1:1987", @"windows-1252" },
{ @"iso_8859-2", @"ISO-8859-2" },
{ @"iso_8859-2:1987", @"ISO-8859-2" },
{ @"iso_8859-3", @"ISO-8859-3" },
{ @"iso_8859-3:1988", @"ISO-8859-3" },
{ @"iso_8859-4", @"ISO-8859-4" },
{ @"iso_8859-4:1988", @"ISO-8859-4" },
{ @"iso_8859-5", @"ISO-8859-5" },
{ @"iso_8859-5:1988", @"ISO-8859-5" },
{ @"iso_8859-6", @"ISO-8859-6" },
{ @"iso_8859-6:1987", @"ISO-8859-6" },
{ @"iso_8859-7", @"ISO-8859-7" },
{ @"iso_8859-7:1987", @"ISO-8859-7" },
{ @"iso_8859-8", @"ISO-8859-8" },
{ @"iso_8859-8:1988", @"ISO-8859-8" },
{ @"iso_8859-9", @"windows-1254" },
{ @"iso_8859-9:1989", @"windows-1254" },
{ @"koi", @"KOI8-R" },
{ @"koi8", @"KOI8-R" },
{ @"koi8-r", @"KOI8-R" },
{ @"koi8-ru", @"KOI8-U" },
{ @"koi8-u", @"KOI8-U" },
{ @"koi8_r", @"KOI8-R" },
{ @"korean", @"EUC-KR" },
{ @"ks_c_5601-1987", @"EUC-KR" },
{ @"ks_c_5601-1989", @"EUC-KR" },
{ @"ksc5601", @"EUC-KR" },
{ @"ksc_5601", @"EUC-KR" },
{ @"l1", @"windows-1252" },
{ @"l2", @"ISO-8859-2" },
{ @"l3", @"ISO-8859-3" },
{ @"l4", @"ISO-8859-4" },
{ @"l5", @"windows-1254" },
{ @"l6", @"ISO-8859-10" },
{ @"l9", @"ISO-8859-15" },
{ @"latin1", @"windows-1252" },
{ @"latin2", @"ISO-8859-2" },
{ @"latin3", @"ISO-8859-3" },
{ @"latin4", @"ISO-8859-4" },
{ @"latin5", @"windows-1254" },
{ @"latin6", @"ISO-8859-10" },
{ @"logical", @"ISO-8859-8-I" },
{ @"mac", @"macintosh" },
{ @"macintosh", @"macintosh" },
{ @"ms932", @"Shift_JIS" },
{ @"ms_kanji", @"Shift_JIS" },
{ @"replacement", @"replacement" },
{ @"shift-jis", @"Shift_JIS" },
{ @"shift_jis", @"Shift_JIS" },
{ @"sjis", @"Shift_JIS" },
{ @"sun_eu_greek", @"ISO-8859-7" },
{ @"tis-620", @"windows-874" },
{ @"unicode-1-1-utf-8", @"UTF-8" },
{ @"us-ascii", @"windows-1252" },
{ @"utf-16", @"UTF-16LE" },
{ @"utf-16be", @"UTF-16BE" },
{ @"utf-16le", @"UTF-16LE" },
{ @"utf-8", @"UTF-8" },
{ @"utf8", @"UTF-8" },
{ @"visual", @"ISO-8859-8" },
{ @"windows-1250", @"windows-1250" },
{ @"windows-1251", @"windows-1251" },
{ @"windows-1252", @"windows-1252" },
{ @"windows-1253", @"windows-1253" },
{ @"windows-1254", @"windows-1254" },
{ @"windows-1255", @"windows-1255" },
{ @"windows-1256", @"windows-1256" },
{ @"windows-1257", @"windows-1257" },
{ @"windows-1258", @"windows-1258" },
{ @"windows-31j", @"Shift_JIS" },
{ @"windows-874", @"windows-874" },
{ @"windows-949", @"EUC-KR" },
{ @"x-cp1250", @"windows-1250" },
{ @"x-cp1251", @"windows-1251" },
{ @"x-cp1252", @"windows-1252" },
{ @"x-cp1253", @"windows-1253" },
{ @"x-cp1254", @"windows-1254" },
{ @"x-cp1255", @"windows-1255" },
{ @"x-cp1256", @"windows-1256" },
{ @"x-cp1257", @"windows-1257" },
{ @"x-cp1258", @"windows-1258" },
{ @"x-euc-jp", @"EUC-JP" },
{ @"x-gbk", @"GBK" },
{ @"x-mac-cyrillic", @"x-mac-cyrillic" },
{ @"x-mac-roman", @"macintosh" },
{ @"x-mac-ukrainian", @"x-mac-cyrillic" },
{ @"x-sjis", @"Shift_JIS" },
{ @"x-user-defined", @"x-user-defined" },
{ @"x-x-big5", @"Big5" },
};
static int (^EncodingLabelComparator)(const void *, const void *) = ^int(const void *voidKey, const void *voidItem) {
const NSString *key = (__bridge const NSString *)voidKey;
const EncodingLabelMap *item = voidItem;
return (int)[key caseInsensitiveCompare:item->label];
};
static NSString * NamedEncodingForLabel(NSString *label)
{
EncodingLabelMap *match = bsearch_b((__bridge const void *)label, EncodingLabels, sizeof(EncodingLabels) / sizeof(EncodingLabels[0]), sizeof(EncodingLabels[0]), EncodingLabelComparator);
if (match) {
return match->name;
} else {
return nil;
}
}
typedef struct {
__unsafe_unretained NSString *name;
CFStringEncoding encoding;
} NameCFEncodingMap;
// This array is generated by the Encoding Labeler utility. Please make adjustments over there, not over here.
static const NameCFEncodingMap StringEncodings[] = {
{ @"Big5", kCFStringEncodingBig5 },
{ @"EUC-JP", kCFStringEncodingEUC_JP },
{ @"EUC-KR", kCFStringEncodingEUC_KR },
{ @"GBK", kCFStringEncodingGBK_95 },
{ @"IBM866", kCFStringEncodingDOSRussian },
{ @"ISO-2022-JP", kCFStringEncodingISO_2022_JP },
{ @"ISO-8859-10", kCFStringEncodingISOLatin6 },
{ @"ISO-8859-13", kCFStringEncodingISOLatin7 },
{ @"ISO-8859-14", kCFStringEncodingISOLatin8 },
{ @"ISO-8859-15", kCFStringEncodingISOLatin9 },
{ @"ISO-8859-16", kCFStringEncodingISOLatin10 },
{ @"ISO-8859-2", kCFStringEncodingISOLatin2 },
{ @"ISO-8859-3", kCFStringEncodingISOLatin3 },
{ @"ISO-8859-4", kCFStringEncodingISOLatin4 },
{ @"ISO-8859-5", kCFStringEncodingISOLatinCyrillic },
{ @"ISO-8859-6", kCFStringEncodingISOLatinArabic },
{ @"ISO-8859-7", kCFStringEncodingISOLatinGreek },
{ @"ISO-8859-8", kCFStringEncodingISOLatinHebrew },
{ @"ISO-8859-8-I", kCFStringEncodingISOLatinHebrew },
{ @"KOI8-R", kCFStringEncodingKOI8_R },
{ @"KOI8-U", kCFStringEncodingKOI8_U },
{ @"Shift_JIS", kCFStringEncodingShiftJIS },
{ @"UTF-16BE", kCFStringEncodingUTF16BE },
{ @"UTF-16LE", kCFStringEncodingUTF16LE },
{ @"UTF-8", kCFStringEncodingUTF8 },
{ @"gb18030", kCFStringEncodingGB_18030_2000 },
{ @"macintosh", kCFStringEncodingMacRoman },
{ @"replacement", kCFStringEncodingInvalidId },
{ @"windows-1250", kCFStringEncodingWindowsLatin2 },
{ @"windows-1251", kCFStringEncodingWindowsCyrillic },
{ @"windows-1252", kCFStringEncodingWindowsLatin1 },
{ @"windows-1253", kCFStringEncodingWindowsGreek },
{ @"windows-1254", kCFStringEncodingWindowsLatin5 },
{ @"windows-1255", kCFStringEncodingWindowsHebrew },
{ @"windows-1256", kCFStringEncodingWindowsArabic },
{ @"windows-1257", kCFStringEncodingWindowsBalticRim },
{ @"windows-1258", kCFStringEncodingWindowsVietnamese },
{ @"windows-874", kCFStringEncodingDOSThai },
{ @"x-mac-cyrillic", kCFStringEncodingMacCyrillic },
// SPEC: The HTML standard unilaterally changes x-user-defined to windows-1252, so let's just define it so.
{ @"x-user-defined", kCFStringEncodingWindowsLatin1 },
};
static int (^NameCFEncodingComparator)(const void *, const void *) = ^int(const void *voidKey, const void *voidItem) {
const NSString *key = (__bridge const NSString *)voidKey;
const NameCFEncodingMap *item = voidItem;
return (int)[key compare:item->name];
};
static NSStringEncoding StringEncodingForName(NSString *name)
{
NameCFEncodingMap *match = bsearch_b((__bridge const void *)name, StringEncodings, sizeof(StringEncodings) / sizeof(StringEncodings[0]), sizeof(StringEncodings[0]), NameCFEncodingComparator);
if (match) {
return CFStringConvertEncodingToNSStringEncoding(match->encoding);
} else {
return HTMLInvalidStringEncoding();
}
}
NSStringEncoding HTMLInvalidStringEncoding(void)
{
return CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingInvalidId);
}
NSStringEncoding HTMLStringEncodingForLabel(NSString *untrimmedLabel)
{
NSString *label = [untrimmedLabel stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
NSString *name = NamedEncodingForLabel(label);
if (name) {
return StringEncodingForName(name);
} else {
return HTMLInvalidStringEncoding();
}
}
BOOL IsASCIICompatibleEncoding(NSStringEncoding nsencoding)
{
CFStringEncoding encoding = CFStringConvertNSStringEncodingToEncoding(nsencoding);
switch (encoding) {
// TODO This is a bespoke list, as I couldn't find a handy list from WHATWG or elsewhere. I guess we could code up their definition of "ASCII-compatible" and run through the list of known string encodings?
case kCFStringEncodingUTF7:
case kCFStringEncodingUTF16:
case kCFStringEncodingUTF16BE:
case kCFStringEncodingUTF16LE:
case kCFStringEncodingHZ_GB_2312:
case kCFStringEncodingUTF7_IMAP:
return NO;
default:
return YES;
}
}
BOOL IsUTF16Encoding(NSStringEncoding encoding)
{
switch (encoding) {
case NSUTF16BigEndianStringEncoding:
case NSUTF16LittleEndianStringEncoding:
return YES;
default:
return NO;
}
}
BOOL UsesLossyWindows1252Decoding(void)
{
#if (__IPHONE_OS_VERSION_MAX_ALLOWED >= 80000) || (__MAC_OS_X_VERSION_MAX_ALLOWED >= 101000)
return [[NSString class] respondsToSelector:@selector(stringEncodingForData:encodingOptions:convertedString:usedLossyConversion:)];
#else
return NO;
#endif
}