818 lines
23 KiB
Objective-C
818 lines
23 KiB
Objective-C
/* NSString+Utilities.m - this file is part of SOGo
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*
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* Copyright (C) 2006-2015 Inverse inc.
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*
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* This file is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This file is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#import <Foundation/NSArray.h>
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#import <Foundation/NSCharacterSet.h>
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#import <Foundation/NSData.h>
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#import <Foundation/NSEnumerator.h>
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#import <Foundation/NSValue.h>
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#import <EOControl/EOQualifier.h>
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#import <NGExtensions/NSDictionary+misc.h>
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#import <NGExtensions/NSObject+Logs.h>
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#import <NGExtensions/NGBase64Coding.h>
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#import <NGMime/NGMimeHeaderFieldGenerator.h>
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#import <SBJson/SBJsonParser.h>
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#import "NSArray+Utilities.h"
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#import "NSDictionary+URL.h"
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#import "NSString+Utilities.h"
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static NSMutableCharacterSet *urlNonEndingChars = nil;
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static NSMutableCharacterSet *urlAfterEndingChars = nil;
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static NSMutableCharacterSet *urlStartChars = nil;
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static NSString **cssEscapingStrings = NULL;
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static unichar *cssEscapingCharacters = NULL;
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static int cssEscapingCount;
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@implementation NSString (SOGoURLExtension)
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- (NSString *) composeURLWithAction: (NSString *) action
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parameters: (NSDictionary *) urlParameters
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andHash: (BOOL) useHash
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{
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NSMutableString *completeURL;
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completeURL = [NSMutableString new];
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[completeURL autorelease];
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[completeURL appendString: [self urlWithoutParameters]];
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if (![completeURL hasSuffix: @"/"])
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[completeURL appendString: @"/"];
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[completeURL appendString: action];
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if (urlParameters)
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[completeURL appendString: [urlParameters asURLParameters]];
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if (useHash)
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[completeURL appendString: @"#"];
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return completeURL;
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}
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- (NSString *) hostlessURL
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{
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NSString *newURL;
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NSRange hostR, locationR;
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if ([self hasPrefix: @"/"])
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{
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newURL = [self copy];
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[newURL autorelease];
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}
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else
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{
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hostR = [self rangeOfString: @"://"];
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locationR = [[self substringFromIndex: (hostR.location + hostR.length)]
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rangeOfString: @"/"];
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newURL = [self substringFromIndex: (hostR.location + hostR.length
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+ locationR.location)];
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}
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return newURL;
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}
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- (NSString *) urlWithoutParameters;
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{
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NSRange r;
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NSString *newUrl;
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r = [self rangeOfString:@"?" options: NSBackwardsSearch];
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if (r.length > 0)
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newUrl = [self substringToIndex: NSMaxRange (r) - 1];
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else
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newUrl = self;
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return newUrl;
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}
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- (NSRange) _rangeOfURLInRange: (NSRange) refRange
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{
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int start, length;
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NSRange workRange;
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// [urlNonEndingChars addCharactersInString: @">&=,.:;\t \r\n"];
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// [urlAfterEndingChars addCharactersInString: @"()[]{}&;<\t \r\n"];
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if (!urlNonEndingChars)
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{
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urlNonEndingChars = [NSMutableCharacterSet new];
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[urlNonEndingChars addCharactersInString: @"=,.:;&()\t \r\n"];
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}
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if (!urlAfterEndingChars)
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{
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urlAfterEndingChars = [NSMutableCharacterSet new];
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[urlAfterEndingChars addCharactersInString: @"()[]\t \r\n"];
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}
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start = refRange.location;
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while (start > -1
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&& ![urlAfterEndingChars characterIsMember:
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[self characterAtIndex: start]])
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start--;
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start++;
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length = [self length];
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// In [UIxMailPartTextViewer flatContentAsString], we first escape HTML entities and then
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// add URLs. Therefore, the brackets (inequality signs <>) have been encoded at this point.
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if (length > (start + 4)
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&& [[self substringWithRange: NSMakeRange (start, 4)] compare: @"<"] == NSOrderedSame)
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start += 4;
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length -= start;
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workRange = [self rangeOfCharacterFromSet: urlAfterEndingChars
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options: NSLiteralSearch range: NSMakeRange (start, length)];
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if (workRange.location != NSNotFound)
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length = workRange.location - start;
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while
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(length > 0
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&& [urlNonEndingChars characterIsMember:
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[self characterAtIndex: (start + length - 1)]])
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length--;
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// Remove trailing ">"
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if (([self length] >= start + length + 1)
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&& [[self substringWithRange: NSMakeRange (start, length + 1)] hasSuffix: @">"])
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length -= 3;
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return NSMakeRange (start, length);
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}
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- (void) _handleURLs: (NSMutableString *) selfCopy
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textToMatch: (NSString *) match
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prefix: (NSString *) prefix
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inRanges: (NSMutableArray *) ranges
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{
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NSEnumerator *enumRanges;
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NSMutableArray *newRanges;
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NSRange matchRange, currentUrlRange, rest;
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NSRange *rangePtr;
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NSString *urlText, *newUrlText;
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unsigned int length, matchLength, offset;
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int startLocation;
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if (!urlStartChars)
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{
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urlStartChars = [NSMutableCharacterSet new];
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[urlStartChars addCharactersInString: @"abcdefghijklmnopqrstuvwxyz"
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@"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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@"0123456789:@"];
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}
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newRanges = [NSMutableArray array];
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matchLength = [match length];
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rest.location = -1;
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matchRange = [selfCopy rangeOfString: match];
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while (matchRange.location != NSNotFound)
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{
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startLocation = matchRange.location;
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while (startLocation > rest.location
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&& [urlStartChars characterIsMember:
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[selfCopy characterAtIndex: startLocation]])
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startLocation--;
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matchRange.location = startLocation + 1;
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// We avoid going out of bounds if the mail content actually finishes
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// with the @ (or something else) character
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if (matchRange.location < [selfCopy length])
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{
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currentUrlRange = [selfCopy _rangeOfURLInRange: matchRange];
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if (![ranges hasRangeIntersection: currentUrlRange])
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if (currentUrlRange.length > matchLength)
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[newRanges addNonNSObject: ¤tUrlRange
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withSize: sizeof (NSRange)
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copy: YES];
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rest.location = NSMaxRange (currentUrlRange);
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length = [selfCopy length];
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rest.length = length - rest.location;
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matchRange = [selfCopy rangeOfString: match
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options: 0 range: rest];
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}
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else
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{
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matchRange.location = NSNotFound;
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}
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}
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// Make the substitutions, keep track of the new offset
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offset = 0;
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enumRanges = [newRanges objectEnumerator];
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while ((rangePtr = [[enumRanges nextObject] pointerValue]))
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{
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rangePtr->location += offset;
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urlText = [selfCopy substringFromRange: *rangePtr];
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newUrlText = [NSString stringWithFormat: @"<a href=\"%@%@\">%@</a>",
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([urlText hasPrefix: prefix]? @"" : prefix),
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urlText, urlText];
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[selfCopy replaceCharactersInRange: *rangePtr
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withString: newUrlText];
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offset += ([newUrlText length] - [urlText length]);
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// Add range for further substitutions
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currentUrlRange = NSMakeRange (rangePtr->location, [newUrlText length]);
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[ranges addNonNSObject: ¤tUrlRange
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withSize: sizeof (NSRange)
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copy: YES];
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}
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[newRanges freeNonNSObjects];
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}
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- (NSString *) stringByDetectingURLs
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{
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NSMutableString *selfCopy;
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NSMutableArray *ranges;
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ranges = [NSMutableArray array];
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selfCopy = [NSMutableString stringWithString: self];
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[self _handleURLs: selfCopy
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textToMatch: @"://"
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prefix: @""
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inRanges: ranges];
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[self _handleURLs: selfCopy
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textToMatch: @"@"
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prefix: @"mailto:"
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inRanges: ranges];
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[ranges freeNonNSObjects];
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return selfCopy;
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}
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- (NSString *) asSafeJSString
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{
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NSMutableString *representation;
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representation = [NSMutableString stringWithString: self];
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[representation replaceString: @"\\" withString: @"\\\\"];
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[representation replaceString: @"\"" withString: @"\\\""];
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[representation replaceString: @"/" withString: @"\\/"];
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[representation replaceString: @"\f" withString: @"\\f"];
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[representation replaceString: @"\n" withString: @"\\n"];
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[representation replaceString: @"\r" withString: @"\\r"];
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[representation replaceString: @"\t" withString: @"\\t"];
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return representation;
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}
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- (NSString *) doubleQuotedString
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{
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return [NSString stringWithFormat: @"\"%@\"", [self asSafeJSString]];
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}
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//
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// See http://www.hackcraft.net/xmlUnicode/
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//
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// XML1.0 and XML1.1 allow different characters in different contexts, but for the most part I will only describe the XML1.0 usage, XML1.1 usage is analogous.
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// The first definition that is relevant here is that of a Char:
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// [2] Char ::= #x9 | #xA | #xD | [#x20-#xD7FF] | [#xE000-#xFFFD] | [#x10000-#x10FFFF] /* any Unicode character, excluding the surrogate blocks, FFFE, and FFFF. */
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//
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// This defines which characters can be used in an XML1.0 document. It is clearly very liberal, banning only some of the control characters and the noncharacters U+FFFE and U+FFFF.
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// Indeed it is somewhat too liberal in my view since it allows other noncharacters (the code points from U+FDD0 to U+FDEF inclusive and the last 2 code points in each plane,
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// from U+1FFFE & U+1FFFF through to U+10FFFE & U+10FFFF, are noncharacters) but the production quoted above allows them.
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//
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- (NSString *) safeString
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{
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NSData *data;
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NSString *s;
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const wchar_t *buf;
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wchar_t *start, c;
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int len, i, j;
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data = [self dataUsingEncoding: NSUTF32LittleEndianStringEncoding];
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len = [data length];
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buf = [data bytes];
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start = (wchar_t *)calloc(len, sizeof(wchar_t));
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for (i = 0, j = 0; i < len/4; i++)
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{
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c = buf[i];
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if (c == 0x9 ||
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c == 0xA ||
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c == 0xD ||
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(c >= 0x20 && c <= 0xD7FF) ||
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(c >= 0xE000 && c <= 0xFFFD) ||
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(c >= (wchar_t)0x10000 && c <= (wchar_t)0x10FFFF))
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{
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start[j] = c;
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j++;
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}
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}
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s = [[NSString alloc] initWithBytesNoCopy: start length: j*sizeof(wchar_t) encoding: NSUTF32LittleEndianStringEncoding freeWhenDone: YES];
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return AUTORELEASE(s);
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}
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//
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// This is a copy from NSString+XMLEscaping.m from SOPE.
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// The difference here is that we use wchar_t instead of unichar.
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// This is needed to get the rigth numeric character reference.
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// e.g. SMILING FACE WITH OPEN MOUTH
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// ok: wchar_t -> 😃 wrong: unichar -> � �
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//
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// We avoid naming it like the one in SOPE since if the ActiveSync
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// bundle is loaded, it'll overwrite the one provided by SOPE.
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//
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- (NSString *) safeStringByEscapingXMLString {
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register unsigned i, len, j;
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register wchar_t *buf;
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const wchar_t *chars;
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unsigned escapeCount;
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if ([self length] == 0) return @"";
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NSData *data = [self dataUsingEncoding:NSUTF32StringEncoding];
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chars = [data bytes];
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len = [data length]/4;
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/* check for characters to escape ... */
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for (i = 0, escapeCount = 0; i < len; i++) {
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switch (chars[i]) {
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case '&': case '"': case '<': case '>': case '\r':
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escapeCount++;
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break;
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default:
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if (chars[i] < 0x20 || chars[i] > 127)
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escapeCount++;
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break;
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}
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}
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if (escapeCount == 0 ) {
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/* nothing to escape ... */
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return [[self copy] autorelease];
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}
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buf = calloc((len + 5) + (escapeCount * 16), sizeof(wchar_t));
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for (i = 0, j = 0; i < len; i++) {
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switch (chars[i]) {
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/* escape special chars */
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case '\r':
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buf[j] = '&'; j++; buf[j] = '#'; j++; buf[j] = '1'; j++;
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buf[j] = '3'; j++; buf[j] = ';'; j++;
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break;
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case '&':
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buf[j] = '&'; j++; buf[j] = 'a'; j++; buf[j] = 'm'; j++;
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buf[j] = 'p'; j++; buf[j] = ';'; j++;
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break;
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case '"':
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buf[j] = '&'; j++; buf[j] = 'q'; j++; buf[j] = 'u'; j++;
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buf[j] = 'o'; j++; buf[j] = 't'; j++; buf[j] = ';'; j++;
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break;
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case '<':
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buf[j] = '&'; j++; buf[j] = 'l'; j++; buf[j] = 't'; j++;
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buf[j] = ';'; j++;
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break;
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case '>':
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buf[j] = '&'; j++; buf[j] = 'g'; j++; buf[j] = 't'; j++;
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buf[j] = ';'; j++;
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break;
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default:
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/* escape big chars */
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if (chars[i] > 127) {
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unsigned char nbuf[32];
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unsigned int k;
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sprintf((char *)nbuf, "&#%i;", (int)chars[i]);
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for (k = 0; nbuf[k] != '\0'; k++) {
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buf[j] = nbuf[k];
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j++;
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}
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}
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else if (chars[i] == 0x9 || chars[i] == 0xA || chars[i] == 0xD || chars[i] >= 0x20) { // ignore any unsupported control character
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/* nothing to escape */
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buf[j] = chars[i];
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j++;
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}
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break;
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}
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}
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self = [[NSString alloc] initWithBytesNoCopy: buf
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length: (j*sizeof(wchar_t))
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encoding: NSUTF32StringEncoding
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freeWhenDone: YES];
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return [self autorelease];
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}
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- (NSString *) jsonRepresentation
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{
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NSString *cleanedString;
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// Escape double quotes and remove control characters
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cleanedString = [[self doubleQuotedString] safeString];
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return cleanedString;
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}
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- (void) _setupCSSEscaping
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{
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NSArray *strings, *characters;
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int count;
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strings = [NSArray arrayWithObjects: @"_U_", @"_D_", @"_H_", @"_A_", @"_S_",
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@"_C_", @"_SC_",
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@"_CO_", @"_SP_", @"_SQ_", @"_DQ_",
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@"_LP_", @"_RP_", @"_LS_", @"_RS_", @"_LC_", @"_RC_",
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@"_AM_", @"_P_", @"_DS_", nil];
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[strings retain];
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cssEscapingStrings = [strings asPointersOfObjects];
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characters = [NSArray arrayWithObjects: @"_", @".", @"#", @"@", @"*",
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@":", @";",
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@",", @" ", @"'", @"\"",
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@"(", @")", @"[", @"]", @"{", @"}",
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@"&", @"+", @"$", nil];
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cssEscapingCount = [strings count];
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cssEscapingCharacters = NSZoneMalloc (NULL,
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(cssEscapingCount + 1)
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* sizeof (unichar));
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for (count = 0; count < cssEscapingCount; count++)
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*(cssEscapingCharacters + count) = [[characters objectAtIndex: count] characterAtIndex: 0];
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*(cssEscapingCharacters + cssEscapingCount) = 0;
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}
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- (int) _cssCharacterIndex: (unichar) character
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{
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int idx, count;
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idx = -1;
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for (count = 0; idx == -1 && count < cssEscapingCount; count++)
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if (*(cssEscapingCharacters + count) == character)
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idx = count;
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return idx;
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}
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- (NSString *) asCSSIdentifier
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{
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NSCharacterSet *numericSet;
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NSMutableString *cssIdentifier;
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unichar currentChar;
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int count, max, idx;
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if (!cssEscapingStrings)
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[self _setupCSSEscaping];
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cssIdentifier = [NSMutableString string];
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numericSet = [NSCharacterSet decimalDigitCharacterSet];
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max = [self length];
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if (max > 0)
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{
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if ([numericSet characterIsMember: [self characterAtIndex: 0]])
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// A CSS identifier can't start with a digit; we add an underscore
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[cssIdentifier appendString: @"_"];
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for (count = 0; count < max; count++)
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{
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currentChar = [self characterAtIndex: count];
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idx = [self _cssCharacterIndex: currentChar];
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if (idx > -1)
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[cssIdentifier appendString: cssEscapingStrings[idx]];
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else
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[cssIdentifier appendFormat: @"%C", currentChar];
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}
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}
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return cssIdentifier;
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}
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- (int) _cssStringIndex: (NSString *) string
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{
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int idx, count;
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idx = -1;
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for (count = 0; idx == -1 && count < cssEscapingCount; count++)
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if ([string hasPrefix: *(cssEscapingStrings + count)])
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idx = count;
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return idx;
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}
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- (NSString *) fromCSSIdentifier
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{
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NSCharacterSet *numericSet;
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NSMutableString *newString;
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NSString *currentString;
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|
int count, length, max, idx;
|
|
unichar currentChar;
|
|
|
|
if (!cssEscapingStrings)
|
|
[self _setupCSSEscaping];
|
|
|
|
numericSet = [NSCharacterSet decimalDigitCharacterSet];
|
|
newString = [NSMutableString string];
|
|
max = [self length];
|
|
count = 0;
|
|
|
|
if (max > 0
|
|
&& [self characterAtIndex: 0] == '_'
|
|
&& [numericSet characterIsMember: [self characterAtIndex: 1]])
|
|
{
|
|
/* If the identifier starts with an underscore followed by a digit,
|
|
we remove the underscore */
|
|
count = 1;
|
|
}
|
|
|
|
for (; count < max - 2; count++)
|
|
{
|
|
currentChar = [self characterAtIndex: count];
|
|
if (currentChar == '_')
|
|
{
|
|
/* The difficulty here is that most escaping strings are 3 chars
|
|
long except one. Therefore we must juggle a little bit with the
|
|
lengths in order to avoid an overflow exception. */
|
|
length = 4;
|
|
if (count + length > max)
|
|
length = max - count;
|
|
currentString = [self substringFromRange: NSMakeRange (count, length)];
|
|
idx = [self _cssStringIndex: currentString];
|
|
if (idx > -1)
|
|
{
|
|
[newString appendFormat: @"%C", cssEscapingCharacters[idx]];
|
|
count += [cssEscapingStrings[idx] length] - 1;
|
|
}
|
|
else
|
|
[newString appendFormat: @"%C", currentChar];
|
|
}
|
|
else
|
|
[newString appendFormat: @"%C", currentChar];
|
|
}
|
|
currentString = [self substringFromRange: NSMakeRange (count, max - count)];
|
|
[newString appendString: currentString];
|
|
|
|
return newString;
|
|
}
|
|
|
|
- (NSString *) pureEMailAddress
|
|
{
|
|
NSString *pureAddress;
|
|
NSRange delimiter;
|
|
|
|
delimiter = [self rangeOfString: @"<"];
|
|
if (delimiter.location == NSNotFound)
|
|
pureAddress = self;
|
|
else
|
|
{
|
|
pureAddress = [self substringFromIndex: NSMaxRange (delimiter)];
|
|
delimiter = [pureAddress rangeOfString: @">"];
|
|
if (delimiter.location != NSNotFound)
|
|
pureAddress = [pureAddress substringToIndex: delimiter.location];
|
|
}
|
|
|
|
return pureAddress;
|
|
}
|
|
|
|
- (NSString *) asQPSubjectString: (NSString *) encoding
|
|
{
|
|
return [NGMimeHeaderFieldGenerator encodeQuotedPrintableText: self];
|
|
}
|
|
|
|
- (BOOL) caseInsensitiveMatches: (NSString *) match
|
|
{
|
|
EOQualifier *sq;
|
|
NSString *format;
|
|
|
|
format = [NSString stringWithFormat:
|
|
@"(description isCaseInsensitiveLike: '%@')",
|
|
match];
|
|
sq = [EOQualifier qualifierWithQualifierFormat: format];
|
|
|
|
return [(id<EOQualifierEvaluation>)sq evaluateWithObject: self];
|
|
}
|
|
|
|
#if LIB_FOUNDATION_LIBRARY
|
|
- (BOOL) boolValue
|
|
{
|
|
return !([self isEqualToString: @"0"]
|
|
|| [self isEqualToString: @"NO"]);
|
|
}
|
|
#endif
|
|
|
|
- (int) timeValue
|
|
{
|
|
int time;
|
|
NSInteger i;
|
|
|
|
if ([self length] > 0)
|
|
{
|
|
i = [self rangeOfString: @":"].location;
|
|
if (i == NSNotFound)
|
|
time = [self intValue];
|
|
else
|
|
time = [[self substringToIndex: i] intValue];
|
|
}
|
|
else
|
|
time = -1;
|
|
|
|
return time;
|
|
}
|
|
|
|
- (BOOL) isJSONString
|
|
{
|
|
NSDictionary *jsonData;
|
|
|
|
#warning this method is a quick and dirty way of detecting the file-format
|
|
jsonData = [self objectFromJSONString];
|
|
|
|
return (jsonData != nil);
|
|
}
|
|
|
|
- (id) objectFromJSONString
|
|
{
|
|
SBJsonParser *parser;
|
|
NSArray *object;
|
|
NSError *error;
|
|
NSString *unescaped, *json;
|
|
|
|
object = nil;
|
|
|
|
if ([self length] > 0)
|
|
{
|
|
parser = [SBJsonParser new];
|
|
[parser autorelease];
|
|
error = nil;
|
|
|
|
/* Parse it this way so we can parse simple values, like "null" */
|
|
json = [NSString stringWithFormat: @"[%@]", self];
|
|
object = [parser objectWithString: json
|
|
error: &error];
|
|
if (error)
|
|
{
|
|
[self errorWithFormat: @"json parser: %@,"
|
|
@" attempting once more after unescaping...", error];
|
|
unescaped = [json stringByReplacingString: @"\\\\"
|
|
withString: @"\\"];
|
|
object = [parser objectWithString: unescaped
|
|
error: &error];
|
|
if (error)
|
|
{
|
|
[self errorWithFormat: @"total failure. Original string is: %@", self];
|
|
object = nil;
|
|
}
|
|
else
|
|
[self logWithFormat: @"initial object deserialized successfully!"];
|
|
}
|
|
}
|
|
|
|
return [object objectAtIndex: 0];
|
|
}
|
|
|
|
- (NSString *) asSafeSQLString
|
|
{
|
|
return [[self stringByReplacingString: @"\\" withString: @"\\\\"]
|
|
stringByReplacingString: @"'" withString: @"\\'"];
|
|
}
|
|
|
|
- (NSUInteger) countOccurrencesOfString: (NSString *) substring
|
|
{
|
|
NSRange matchRange, substrRange;
|
|
BOOL done = NO;
|
|
NSUInteger selfLen, substrLen, count = 0;
|
|
|
|
selfLen = [self length];
|
|
substrLen = [substring length];
|
|
|
|
matchRange = NSMakeRange (0, selfLen);
|
|
while (!done)
|
|
{
|
|
substrRange = [self rangeOfString: substring options: 0 range: matchRange];
|
|
if (substrRange.location == NSNotFound)
|
|
done = YES;
|
|
else
|
|
{
|
|
count++;
|
|
matchRange.location = substrRange.location + 1;
|
|
if (matchRange.location + substrLen > selfLen)
|
|
done = YES;
|
|
else
|
|
matchRange.length = selfLen - matchRange.location;
|
|
}
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
- (NSString *) stringByReplacingPrefix: (NSString *) oldPrefix
|
|
withPrefix: (NSString *) newPrefix
|
|
{
|
|
NSUInteger oldPrefixLength;
|
|
NSString *newString;
|
|
|
|
if (![self hasPrefix: oldPrefix])
|
|
[NSException raise: NSInvalidArgumentException
|
|
format: @"string does not have the specified prefix"];
|
|
|
|
oldPrefixLength = [oldPrefix length];
|
|
newString = [NSString stringWithFormat: @"%@%@",
|
|
newPrefix,
|
|
[self substringFromIndex: oldPrefixLength]];
|
|
|
|
return newString;
|
|
}
|
|
|
|
- (NSString *) encryptWithKey: (NSString *) theKey
|
|
{
|
|
NSMutableData *encryptedPassword;
|
|
NSMutableString *key;
|
|
NSString *result;
|
|
NSUInteger i, passLength, theKeyLength, keyLength;
|
|
unichar p, k, e;
|
|
|
|
if ([theKey length] > 0)
|
|
{
|
|
// The length of the key must be greater (or equal) than
|
|
// the length of the password
|
|
key = [NSMutableString string];
|
|
keyLength = 0;
|
|
|
|
passLength = [self length];
|
|
theKeyLength = [theKey length];
|
|
while (keyLength < passLength)
|
|
{
|
|
[key appendString: theKey];
|
|
keyLength += theKeyLength;
|
|
}
|
|
|
|
encryptedPassword = [NSMutableData data];
|
|
for (i = 0; i < passLength; i++)
|
|
{
|
|
p = [self characterAtIndex: i];
|
|
k = [key characterAtIndex: i];
|
|
e = p ^ k;
|
|
[encryptedPassword appendBytes: (void *)&e length: 2];
|
|
}
|
|
|
|
result = [encryptedPassword stringByEncodingBase64];
|
|
}
|
|
else
|
|
result = nil;
|
|
|
|
return result;
|
|
}
|
|
|
|
- (NSString *) decryptWithKey: (NSString *) theKey
|
|
{
|
|
NSMutableString *result;
|
|
NSMutableString *key;
|
|
NSData *decoded;
|
|
unichar *decryptedPassword;
|
|
NSUInteger i, theKeyLength, keyLength, decodedLength;
|
|
unichar p, k;
|
|
|
|
if ([theKey length] > 0)
|
|
{
|
|
decoded = [self dataByDecodingBase64];
|
|
decryptedPassword = (unichar *)[decoded bytes];
|
|
|
|
// The length of the key must be greater (or equal) than
|
|
// the length of the password
|
|
key = [NSMutableString string];
|
|
keyLength = 0;
|
|
decodedLength = ([decoded length] / 2); /* 1 unichar = 2 bytes/char */
|
|
theKeyLength = [theKey length];
|
|
|
|
while (keyLength < decodedLength)
|
|
{
|
|
[key appendString: theKey];
|
|
keyLength += theKeyLength;
|
|
}
|
|
|
|
result = [NSMutableString string];
|
|
for (i = 0; i < decodedLength; i++)
|
|
{
|
|
k = [key characterAtIndex: i];
|
|
p = decryptedPassword[i] ^ k;
|
|
[result appendFormat: @"%C", p];
|
|
}
|
|
}
|
|
else
|
|
result = nil;
|
|
|
|
return result;
|
|
}
|
|
|
|
@end
|