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142 lines
4.7 KiB
142 lines
4.7 KiB
/*
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utf8validator.cpp
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This file is part of KSieve,
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the KDE internet mail/usenet news message filtering library.
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Copyright (c) 2003 Marc Mutz <mutz@kde.org>
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KSieve is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License, version 2, as
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published by the Free Software Foundation.
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KSieve is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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In addition, as a special exception, the copyright holders give
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permission to link the code of this program with any edition of
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the TQt library by Trolltech AS, Norway (or with modified versions
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of TQt that use the same license as TQt), and distribute linked
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combinations including the two. You must obey the GNU General
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Public License in all respects for all of the code used other than
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TQt. If you modify this file, you may extend this exception to
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your version of the file, but you are not obligated to do so. If
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you do not wish to do so, delete this exception statement from
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your version.
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*/
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#include <impl/utf8validator.h>
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#include <tqglobal.h>
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#include <tqcstring.h>
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static inline bool is8Bit( signed char ch ) {
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return ch < 0;
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}
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static inline bool isUtf8TupelIndicator( unsigned char ch ) {
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return (ch & 0xE0) == 0xC0; // 110x xxxx
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}
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static inline bool isUtf8OverlongTupel( unsigned char ch ) {
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return (ch & 0xFE) == 0xC0;
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}
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static inline bool isUtf8TripleIndicator( unsigned char ch ) {
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return (ch & 0xF0) == 0xE0; // 1110 xxxx
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}
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static inline bool isUtf8OverlongTriple( unsigned char ch1, unsigned char ch2 ) {
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return (ch1 & 0xFF) == 0xE0 && (ch2 & 0xE0) == 0x80 ;
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}
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static inline bool isUtf8QuartetIndicator( unsigned char ch ) {
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return (ch & 0xF8) == 0xF0; // 1111 0xxx
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}
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static inline bool isUtf8OverlongQuartet( unsigned char ch1, unsigned char ch2 ) {
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return (ch1 & 0xFF) == 0xF0 && (ch2 & 0xF0) == 0x80 ;
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}
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static inline bool isUtf8QuintetIndicator( unsigned char ch ) {
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return (ch & 0xFC) == 0xF8; // 1111 10xx
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}
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static inline bool isUtf8OverlongQuintet( unsigned char ch1, unsigned char ch2 ) {
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return (ch1 & 0xFF) == 0xF8 && (ch2 & 0xF8) == 0x80 ;
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}
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static inline bool isUtf8SextetIndicator( unsigned char ch ) {
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return (ch & 0xFE) == 0xFC; // 1111 110x
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}
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static inline bool isUtf8OverlongSextet( unsigned char ch1, unsigned char ch2 ) {
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return (ch1 & 0xFF) == 0xFC && (ch2 & 0xFC) == 0x80 ;
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}
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static inline bool isUtf8Continuation( unsigned char ch ) {
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return (ch & 0xC0) == 0x80;
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}
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bool KSieve::isValidUtf8( const char * s, unsigned int len ) {
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for ( unsigned int i = 0 ; i < len ; ++i ) {
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const unsigned char ch = s[i];
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if ( !is8Bit( ch ) )
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continue;
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if ( isUtf8TupelIndicator( ch ) ) {
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if ( len - i < 1 ) // too short
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return false;
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if ( isUtf8OverlongTupel( ch ) ) // not minimally encoded
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return false;
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if ( !isUtf8Continuation( s[i+1] ) ) // not followed by 10xx xxxx
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return false;
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i += 1;
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} else if ( isUtf8TripleIndicator( ch ) ) {
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if ( len - i < 2 ) // too short
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return false;
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if ( isUtf8OverlongTriple( ch, s[i+1] ) ) // not minimally encoded
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return false;
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if ( !isUtf8Continuation( s[i+2] ) ) // not followed by 10xx xxxx
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return false;
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i += 2;
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} else if ( isUtf8QuartetIndicator( ch ) ) {
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if ( len - i < 3 ) // too short
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return false;
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if ( isUtf8OverlongQuartet( ch, s[i+1] ) ) // not minimally encoded
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return false;
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if ( !isUtf8Continuation( s[i+2] ) ||
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!isUtf8Continuation( s[i+3] ) ) // not followed by 2x 10xx xxxx
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return false;
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i += 3;
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} else if ( isUtf8QuintetIndicator( ch ) ) {
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if ( len - i < 4 ) // too short
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return false;
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if ( isUtf8OverlongQuintet( ch, s[i+1] ) ) // not minimally encoded
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return false;
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if ( !isUtf8Continuation( s[i+2] ) ||
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!isUtf8Continuation( s[i+3] ) ||
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!isUtf8Continuation( s[i+4] ) ) // not followed by 3x 10xx xxxx
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return false;
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i += 4;
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} else if ( isUtf8SextetIndicator( ch ) ) {
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if ( len - i < 5 ) // too short
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return false;
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if ( isUtf8OverlongSextet( ch, s[i+1] ) ) // not minimally encoded
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return false;
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if ( !isUtf8Continuation( s[i+2] ) ||
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!isUtf8Continuation( s[i+3] ) ||
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!isUtf8Continuation( s[i+4] ) ||
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!isUtf8Continuation( s[i+5] ) ) // not followed by 4x 10xx xxxx
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return false;
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i += 5;
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} else
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return false;
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}
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return true;
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}
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