зеркало из https://github.com/mozilla/gecko-dev.git
bug 191542 : Add UTF-8 equivalent of |IsASCII|, IsUTF8. r=smontagu, sr=alecf
This commit is contained in:
jshin%mailaps.org
Родитель
adb09c10c3
Коммит
a5ddc8b721
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@ -191,9 +191,8 @@ nsresult nsTextToSubURI::convertURItoUnicode(const nsAFlatCString &aCharset,
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}
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if (!isStatefulCharset && aIRI) {
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NS_ConvertUTF8toUCS2 ucs2(aURI);
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if (aURI.Equals(NS_ConvertUCS2toUTF8(ucs2))) {
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_retval.Assign(ucs2);
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if (IsUTF8(aURI)) {
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_retval.Assign(NS_ConvertUTF8toUCS2(aURI));
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return rv;
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}
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}
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@ -174,6 +174,26 @@ NS_COM PRBool IsASCII( const nsAString& aString );
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NS_COM PRBool IsASCII( const nsACString& aString );
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/**
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* Returns |PR_TRUE| if |aString| is a valid UTF-8 string.
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* XXX This is not bullet-proof and nor an all-purpose UTF-8 validator.
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* It is mainly written to replace and roughly equivalent to
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*
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* str.Equals(NS_ConvertUCS2toUTF8(NS_ConvertUTF8toUCS2(str)))
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*
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* (see bug 191541)
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* As such, it does not check for non-UTF-8 7bit encodings such as
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* ISO-2022-JP and HZ. However, it filters out UTF-8 representation
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* of surrogate codepoints and non-characters ( 0xFFFE and 0xFFFF
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* in planes 0 through 16.) as well as overlong UTF-8 sequences.
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* Also note that it regards UTF-8 sequences corresponding to
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* codepoints above 0x10FFFF as invalid in accordance with
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* http://www.ietf.org/internet-drafts/draft-yergeau-rfc2279bis-04.txt
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*
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* @param aString an 8-bit wide string to scan
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*/
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NS_COM PRBool IsUTF8( const nsACString& aString );
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/**
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* Converts case in place in the argument string.
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@ -367,7 +367,102 @@ IsASCII( const nsACString& aString )
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return PR_TRUE;
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}
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NS_COM
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PRBool
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IsUTF8( const nsACString& aString )
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{
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nsReadingIterator<char> done_reading;
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aString.EndReading(done_reading);
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PRInt32 state = 0;
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PRBool overlong = PR_FALSE;
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PRBool surrogate = PR_FALSE;
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PRBool nonchar = PR_FALSE;
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PRUint16 olupper = 0; // overlong byte upper bound.
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PRUint16 slower = 0; // surrogate byte lower bound.
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// for each chunk of |aString|...
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PRUint32 fragmentLength = 0;
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nsReadingIterator<char> iter;
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for ( aString.BeginReading(iter); iter != done_reading; iter.advance( PRInt32(fragmentLength) ) )
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{
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fragmentLength = PRUint32(iter.size_forward());
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const char* ptr = iter.get();
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const char* fragmentEnd = ptr + fragmentLength;
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// for each character in this chunk...
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while ( ptr < fragmentEnd )
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{
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PRUint8 c;
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if (0 == state)
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{
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c = *ptr++;
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if ( UTF8traits::isASCII(c) )
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continue;
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if ( c <= 0xC1 ) // [80-BF] where not expected, [C0-C1] for overlong.
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return PR_FALSE;
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else if ( UTF8traits::is2byte(c) )
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state = 1;
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else if ( UTF8traits::is3byte(c) )
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{
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state = 2;
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if ( c == 0xE0 ) // to exclude E0[80-9F][80-BF]
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{
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overlong = PR_TRUE;
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olupper = 0x9F;
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}
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else if ( c == 0xED ) // ED[A0-BF][80-BF] : surrogate codepoint
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{
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surrogate = PR_TRUE;
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slower = 0xA0;
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}
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else if ( c == 0xEF ) // EF BF [BE-BF] : non-character
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nonchar = PR_TRUE;
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}
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else if ( c <= 0xF4 ) // XXX replace /w UTF8traits::is4byte when it's updated to exclude [F5-F7].(bug 199090)
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{
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state = 3;
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nonchar = PR_TRUE;
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if ( c == 0xF0 ) // to exclude F0[80-8F][80-BF]{2}
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{
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overlong = PR_TRUE;
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olupper = 0x8F;
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}
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else if ( c == 0xF4 ) // to exclude F4[90-BF][80-BF]
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{
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// actually not surrogates but codepoints beyond 0x10FFFF
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surrogate = PR_TRUE;
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slower = 0x90;
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}
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}
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else
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return PR_FALSE; // Not UTF8 string
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}
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while (ptr < fragmentEnd && state)
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{
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c = *ptr++;
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--state;
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// non-character : EF BF [BE-BF] or F[0-7] [89AB]F BF [BE-BF]
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if ( nonchar && ( !state && c < 0xBE ||
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state == 1 && c != 0xBF ||
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state == 2 && 0x0F != (0x0F & c) ))
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nonchar = PR_FALSE;
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if ( !UTF8traits::isInSeq(c) || overlong && c <= olupper ||
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surrogate && slower <= c || nonchar && !state )
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return PR_FALSE; // Not UTF8 string
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overlong = surrogate = PR_FALSE;
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}
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}
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}
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return !state; // state != 0 at the end indicates an invalid UTF-8 seq.
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}
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/**
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* A character sink for in-place case conversion.
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@ -174,6 +174,26 @@ NS_COM PRBool IsASCII( const nsAString& aString );
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NS_COM PRBool IsASCII( const nsACString& aString );
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/**
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* Returns |PR_TRUE| if |aString| is a valid UTF-8 string.
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* XXX This is not bullet-proof and nor an all-purpose UTF-8 validator.
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* It is mainly written to replace and roughly equivalent to
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*
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* str.Equals(NS_ConvertUCS2toUTF8(NS_ConvertUTF8toUCS2(str)))
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*
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* (see bug 191541)
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* As such, it does not check for non-UTF-8 7bit encodings such as
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* ISO-2022-JP and HZ. However, it filters out UTF-8 representation
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* of surrogate codepoints and non-characters ( 0xFFFE and 0xFFFF
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* in planes 0 through 16.) as well as overlong UTF-8 sequences.
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* Also note that it regards UTF-8 sequences corresponding to
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* codepoints above 0x10FFFF as invalid in accordance with
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* http://www.ietf.org/internet-drafts/draft-yergeau-rfc2279bis-04.txt
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*
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* @param aString an 8-bit wide string to scan
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*/
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NS_COM PRBool IsUTF8( const nsACString& aString );
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/**
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* Converts case in place in the argument string.
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@ -367,7 +367,102 @@ IsASCII( const nsACString& aString )
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return PR_TRUE;
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}
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NS_COM
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PRBool
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IsUTF8( const nsACString& aString )
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{
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nsReadingIterator<char> done_reading;
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aString.EndReading(done_reading);
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PRInt32 state = 0;
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PRBool overlong = PR_FALSE;
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PRBool surrogate = PR_FALSE;
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PRBool nonchar = PR_FALSE;
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PRUint16 olupper = 0; // overlong byte upper bound.
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PRUint16 slower = 0; // surrogate byte lower bound.
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// for each chunk of |aString|...
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PRUint32 fragmentLength = 0;
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nsReadingIterator<char> iter;
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for ( aString.BeginReading(iter); iter != done_reading; iter.advance( PRInt32(fragmentLength) ) )
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{
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fragmentLength = PRUint32(iter.size_forward());
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const char* ptr = iter.get();
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const char* fragmentEnd = ptr + fragmentLength;
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// for each character in this chunk...
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while ( ptr < fragmentEnd )
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{
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PRUint8 c;
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if (0 == state)
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{
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c = *ptr++;
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if ( UTF8traits::isASCII(c) )
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continue;
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if ( c <= 0xC1 ) // [80-BF] where not expected, [C0-C1] for overlong.
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return PR_FALSE;
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else if ( UTF8traits::is2byte(c) )
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state = 1;
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else if ( UTF8traits::is3byte(c) )
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{
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state = 2;
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if ( c == 0xE0 ) // to exclude E0[80-9F][80-BF]
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{
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overlong = PR_TRUE;
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olupper = 0x9F;
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}
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else if ( c == 0xED ) // ED[A0-BF][80-BF] : surrogate codepoint
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{
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surrogate = PR_TRUE;
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slower = 0xA0;
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}
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else if ( c == 0xEF ) // EF BF [BE-BF] : non-character
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nonchar = PR_TRUE;
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}
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else if ( c <= 0xF4 ) // XXX replace /w UTF8traits::is4byte when it's updated to exclude [F5-F7].(bug 199090)
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{
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state = 3;
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nonchar = PR_TRUE;
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if ( c == 0xF0 ) // to exclude F0[80-8F][80-BF]{2}
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{
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overlong = PR_TRUE;
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olupper = 0x8F;
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}
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else if ( c == 0xF4 ) // to exclude F4[90-BF][80-BF]
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{
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// actually not surrogates but codepoints beyond 0x10FFFF
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surrogate = PR_TRUE;
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slower = 0x90;
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}
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}
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else
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return PR_FALSE; // Not UTF8 string
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}
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while (ptr < fragmentEnd && state)
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{
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c = *ptr++;
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--state;
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// non-character : EF BF [BE-BF] or F[0-7] [89AB]F BF [BE-BF]
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if ( nonchar && ( !state && c < 0xBE ||
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state == 1 && c != 0xBF ||
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state == 2 && 0x0F != (0x0F & c) ))
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nonchar = PR_FALSE;
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if ( !UTF8traits::isInSeq(c) || overlong && c <= olupper ||
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surrogate && slower <= c || nonchar && !state )
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return PR_FALSE; // Not UTF8 string
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overlong = surrogate = PR_FALSE;
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}
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}
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}
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return !state; // state != 0 at the end indicates an invalid UTF-8 seq.
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}
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/**
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* A character sink for in-place case conversion.
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