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/*
** UTF8.m
**
** Copyright (c) 2001, 2002
**
** Author: Vincent Ricard <vricard@wanadoo.fr>
**
** This library is free software; you can redistribute it and/or
** modify it under the terms of the GNU Lesser General Public
** License as published by the Free Software Foundation; either
** version 2.1 of the License, or (at your option) any later version.
**
** This library is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
** Lesser General Public License for more details.
**
** You should have received a copy of the GNU Lesser General Public
** License along with this library; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <Pantomime/UTF8.h>
#include <Pantomime/Constants.h>
#include <Foundation/NSString.h>
#include <ctype.h>
#include <stdio.h>
@implementation UTF8
// convert 0xc1c2
// c1 and c2 must be tested with isxdigit() before to call this method
+ (unsigned char) convertHexaCodeToByte: (unsigned char) c1 and: (unsigned char) c2
{
unsigned char byte = 0;
if ( isdigit(c1) )
{
byte += c1 - '0';
}
else if ( islower(c1) )
{
byte += 10 + c1 - 'a';
}
else
{
byte += 10 + c1 - 'A';
}
byte <<= 4;
if ( isdigit(c2) )
{
byte += c2 - '0';
}
else if ( islower(c2) )
{
byte += 10 + c2 - 'a';
}
else
{
byte += 10 + c2 - 'A';
}
return byte;
}
+ (NSString *) decodeString: (NSString *) theString
{
NSMutableString *result;
int i;
result = [[NSMutableString alloc] initWithString: theString];
for ( i = 0; i < [result length]; )
{
int j = i;
if ( ([result characterAtIndex: i] == '=') && (i + 2 < [result length]) &&
(isxdigit([result characterAtIndex: i + 1])) &&
(isxdigit([result characterAtIndex: i + 2])) )
{
// It's a unicode character
unichar c = 0;
unsigned char pattern = [self convertHexaCodeToByte: [result characterAtIndex: i + 1]
and: [result characterAtIndex: i + 2]];
i += 3;
if ( pattern < 0x80 )
{
// 0xxxxxxx
c = pattern & (~0x80);
}
else if ( 0xC0 == (pattern & 0xC0) )
{
// 110xxxxx 10xxxxxx
c = pattern & (~0xC0);
if ( ([result characterAtIndex: i] == '=') && (i + 2 < [result length]) &&
(isxdigit([result characterAtIndex: i + 1])) &&
(isxdigit([result characterAtIndex: i + 2])) )
{
unsigned char p = [self convertHexaCodeToByte: [result characterAtIndex: i + 1]
and: [result characterAtIndex: i + 2]];
c <<= 6;
c |= p & (~0x80);
i += 3;
}
}
else if ( 0xE0 == (pattern & 0xE0) )
{
// 1110xxxx 10xxxxxx 10xxxxxx
int times = 2;
c = pattern & (~0xE0);
while ( times )
{
if ( ([result characterAtIndex: i] == '=') && (i + 2 < [result length]) &&
(isxdigit([result characterAtIndex: i + 1])) &&
(isxdigit([result characterAtIndex: i + 2])) )
{
unsigned char p = [self convertHexaCodeToByte: [result characterAtIndex: i + 1]
and: [result characterAtIndex: i + 2]];
c <<= 6;
c |= p & (~0x80);
i += 3;
}
times--;
}
}
else if ( 0xF0 == (pattern & 0xF0) )
{
// IMPOSSIBLE to decode if unichar is unsigned short (16 bits)
// 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
int times = 3;
c = pattern & (~0xF0);
while ( times )
{
if ( ([result characterAtIndex: i] == '=') && (i + 2 < [result length]) &&
(isxdigit([result characterAtIndex: i + 1])) &&
(isxdigit([result characterAtIndex: i + 2])) )
{
unsigned char p = [self convertHexaCodeToByte: [result characterAtIndex: i + 1]
and: [result characterAtIndex: i + 2]];
c <<= 6;
c |= p & (~0x80);
i += 3;
}
times--;
}
}
else if ( 0xF8 == (pattern & 0xF8) )
{
// IMPOSSIBLE to decode if unichar is unsigned short (16 bits)
// 111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
int times = 4;
c = pattern & (~0xF8);
while ( times )
{
if ( ([result characterAtIndex: i] == '=') && (i + 2 < [result length]) &&
(isxdigit([result characterAtIndex: i + 1])) &&
(isxdigit([result characterAtIndex: i + 2])) )
{
unsigned char p = [self convertHexaCodeToByte: [result characterAtIndex: i + 1]
and: [result characterAtIndex: i + 2]];
c <<= 6;
c |= p & (~0x80);
i += 3;
}
times--;
}
}
else if ( 0xFC == (pattern & 0xFC) )
{
// IMPOSSIBLE to decode if unichar is unsigned short (16 bits)
// 1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
int times = 5;
c = pattern & (~0xFC);
while ( times )
{
if ( ([result characterAtIndex: i] == '=') && (i + 2 < [result length]) &&
(isxdigit([result characterAtIndex: i + 1])) &&
(isxdigit([result characterAtIndex: i + 2])) )
{
unsigned char p = [self convertHexaCodeToByte: [result characterAtIndex: i + 1]
and: [result characterAtIndex: i + 2]];
c <<= 6;
c |= p & (~0x80);
i += 3;
}
times--;
}
}
[result replaceCharactersInRange: NSMakeRange(j, i-j)
withString: [NSString stringWithCharacters: &c length: 1]];
}
i = ++j;
}
return AUTORELEASE(result);
}
@end
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