/*
Copyright (C) 2000-2007 SKYRIX Software AG
Copyright (C) 2007 Helge Hess
This file is part of SOPE.
SOPE 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, or (at your option) any
later version.
SOPE 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 SOPE; see the file COPYING. If not, write to the
Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA.
*/
#import <Foundation/NSData.h>
#include <NGImap4/NSString+Imap4.h>
#include "imCommon.h"
@implementation NSString(Imap4)
static unsigned int _encodeToModifiedUTF7(unichar *_char, unsigned char *result_,
unsigned int *cntRes_);
static unsigned int _decodeOfModifiedUTF7(unsigned char *_source, unichar *result_,
unsigned int *cntRes_ );
- (NSString *)stringByEncodingImap4FolderName {
unichar *buf = NULL;
unsigned char *res = NULL;
unsigned int len = 0;
unsigned int cnt = 0;
unsigned int cntRes = 0;
NSString *result = nil;
len = [self length];
buf = NSZoneMalloc(NULL, (len + 1) * sizeof(unichar));
[self getCharacters: buf];
buf[len] = 0;
/* 1 * '&', 3 for the max bytes / char, 1 * '-' */
res = NSZoneMalloc(NULL, ((len * 5) + 1) * sizeof(char));
while (cnt < len) {
unichar c = buf[cnt];
if (((c > 31) && (c < 38)) ||
((c > 38) && (c < 127))) {
res[cntRes++] = c;
}
else {
if (c == '&') {
res[cntRes++] = '&';
res[cntRes++] = '-';
}
else {
res[cntRes++] = '&';
cnt += _encodeToModifiedUTF7(buf + cnt, res + cntRes, &cntRes);
res[cntRes++] = '-';
}
}
cnt++;
}
if (buf != NULL) NSZoneFree(NULL, buf);
res[cntRes] = 0;
result = [NSString stringWithCString: (char *) res
encoding: NSISOLatin1StringEncoding];
return result;
}
- (NSString *)stringByDecodingImap4FolderName {
unsigned char *buf;
unichar *res;
unsigned int len;
unsigned int cnt = 0;
unsigned int cntRes = 0;
NSString *result = nil;
// NSData *data;
if ((len = [self lengthOfBytesUsingEncoding: NSISOLatin1StringEncoding]) == 0)
return @"";
buf = NSZoneMalloc(NULL, (len + 1) * sizeof(unsigned char));
if ([self getCString:(char *)buf maxLength: len + 1
encoding: NSISOLatin1StringEncoding] == NO) {
NSZoneFree(NULL, buf);
return @"";
}
buf[len] = '\0';
res = NSZoneMalloc(NULL, (len + 1) * sizeof(unichar));
while (cnt < len) { /* &- */
unsigned char c;
c = buf[cnt];
if (c == '&') {
if (buf[cnt + 1] == '-') {
res[cntRes++] = '&';
cnt += 2;
}
else {
cnt += _decodeOfModifiedUTF7(buf + cnt + 1, res + cntRes, &cntRes) + 1;
}
}
else {
res[cntRes++] = c;
cnt++;
}
}
if (buf != NULL) NSZoneFree(NULL, buf);
res[cntRes] = 0;
result = [NSString stringWithCharacters: res length: cntRes];
return result;
}
/* check metamail output for correctness */
static unsigned char basis_64[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
static char index_64[128] = {
-1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
-1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
-1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,62, -1,-1,-1,63,
52,53,54,55, 56,57,58,59, 60,61,-1,-1, -1,-1,-1,-1,
-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10, 11,12,13,14,
15,16,17,18, 19,20,21,22, 23,24,25,-1, -1,-1,-1,-1,
-1,26,27,28, 29,30,31,32, 33,34,35,36, 37,38,39,40,
41,42,43,44, 45,46,47,48, 49,50,51,-1, -1,-1,-1,-1
};
#define char64(c) (((c) < 0 || (c) > 127) ? -1 : index_64[(c)])
static unsigned int _encodeToModifiedUTF7(unichar *_char, unsigned char *result_,
unsigned int *cntRes_)
{
unsigned int processedSrc, processedDest, cycle;
unichar c;
char leftover;
BOOL hasLeftOver;
hasLeftOver = NO;
processedSrc = 0;
processedDest = 0;
cycle = 0;
leftover = 0;
c = *_char;
while (c > 126 || (c > 0 && c < 32)) {
if (cycle == 0) {
*(result_ + processedDest) = basis_64[(c >> 10) & 0x3f];
*(result_ + processedDest + 1) = basis_64[(c >> 4) & 0x3f];
leftover = (c << 2);
hasLeftOver = YES;
processedDest += 2;
cycle = 1;
}
else if (cycle == 1) {
*(result_ + processedDest) = basis_64[(leftover | (c >> 14)) & 0x3f];
*(result_ + processedDest + 1) = basis_64[(c >> 8) & 0x3f];
*(result_ + processedDest + 2) = basis_64[(c >> 2) & 0x3f];
leftover = (c << 4);
hasLeftOver = YES;
processedDest += 3;
cycle = 2;
}
else if (cycle == 2) {
*(result_ + processedDest) = basis_64[(leftover | (c >> 12)) & 0x3f];
*(result_ + processedDest + 1) = basis_64[(c >> 6) & 0x3f];
*(result_ + processedDest + 2) = basis_64[c & 0x3f];
leftover = 0;
hasLeftOver = NO;
processedDest += 3;
cycle = 0;
}
processedSrc++;
c = *(_char + processedSrc);
}
if (hasLeftOver) {
*(result_ + processedDest) = basis_64[leftover & 0x3f];
processedDest++;
}
processedSrc--;
*cntRes_ += processedDest;
return processedSrc;
}
static unsigned int _decodeOfModifiedUTF7(unsigned char *_source, unichar *result_,
unsigned int *cntRes_)
{
unsigned int processedSrc, processedDest;
unsigned char c, decoded;
unichar currentRes;
int shift;
processedSrc = 0;
processedDest = 0;
shift = 10;
currentRes = 0;
c = *_source;
while (c != 0 && c != '-') {
decoded = index_64[c];
if (shift < 0) {
currentRes |= (decoded >> (shift * -1));
*(result_ + processedDest) = currentRes;
processedDest++;
shift += 16;
currentRes = (decoded << shift);
} else {
currentRes |= (decoded << shift);
if (shift == 0) {
*(result_ + processedDest) = currentRes;
processedDest++;
currentRes = 0;
shift = 16;
}
}
shift -= 6;
processedSrc++;
c = *(_source + processedSrc);
}
if (shift != 10) {
*(result_ + processedDest) = currentRes;
}
if (c == '-')
processedSrc++;
*cntRes_ += processedDest;
return processedSrc;
}
- (NSString *)stringByEscapingImap4Password {
// TODO: perf
unichar *buffer;
unichar *chars;
unsigned len, i, j;
NSString *s;
len = [self length];
chars = NSZoneCalloc(NULL, len + 2, sizeof(unichar));
[self getCharacters:chars];
buffer = NSZoneCalloc(NULL, len * 2 + 2, sizeof(unichar));
buffer[len * 2] = '\0';
for (i = 0, j = 0; i < len; i++, j++) {
BOOL conv = NO;
if (chars[i] <= 0x1F || chars[i] > 0x7F) {
conv = YES;
}
else switch (chars[i]) {
case '(':
case ')':
case '{':
case ' ':
case '%':
case '*':
case '"':
case '\\':
conv = YES;
break;
}
if (conv) {
buffer[j] = '\\';
j++;
}
buffer[j] = chars[i];
}
if (chars != NULL) NSZoneFree(NULL, chars);
s = [NSString stringWithCharacters:buffer length:j];
return s;
}
@end /* NSString(Imap4) */