7c25b53fdf
This was done with a brute-force approach, ensuring no additional warnings from GCC 4.9 under x86_64.
215 lines
5.7 KiB
Objective-C
215 lines
5.7 KiB
Objective-C
/* NSData+Mail.m - this file is part of SOGo
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*
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* Copyright (C) 2007-2015 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 <NGExtensions/NGBase64Coding.h>
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#import <NGExtensions/NGQuotedPrintableCoding.h>
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#import <NGExtensions/NSString+Encoding.h>
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#import <NGExtensions/NSObject+Logs.h>
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#import "NSData+Mail.h"
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@implementation NSData (SOGoMailUtilities)
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- (NSData *) bodyDataFromEncoding: (NSString *) encoding
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{
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NSString *realEncoding;
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NSData *decodedData;
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if ([encoding length] > 0)
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{
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realEncoding = [encoding lowercaseString];
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if ([realEncoding isEqualToString: @"7bit"]
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|| [realEncoding isEqualToString: @"8bit"]
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|| [realEncoding isEqualToString: @"binary"])
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decodedData = self;
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else if ([realEncoding isEqualToString: @"base64"])
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decodedData = [self dataByDecodingBase64];
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else if ([realEncoding isEqualToString: @"quoted-printable"])
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decodedData = [self dataByDecodingQuotedPrintableTransferEncoding];
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else
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{
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decodedData = nil;
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//NSLog (@"encoding '%@' unknown, returning nil data", realEncoding);
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}
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}
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else
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decodedData = self;
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return decodedData;
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}
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- (NSString *) bodyStringFromCharset: (NSString *) charset
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{
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NSString *lcCharset, *bodyString;
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if ([charset length])
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lcCharset = [charset lowercaseString];
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else
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lcCharset = @"us-ascii";
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bodyString = [NSString stringWithData: self usingEncodingNamed: lcCharset];
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if (![bodyString length])
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{
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/* UTF-8 is used as a 8bit fallback charset... */
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bodyString = [[NSString alloc] initWithData: self
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encoding: NSUTF8StringEncoding];
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[bodyString autorelease];
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}
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if (!bodyString)
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{
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/*
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iCalendar invitations sent by Outlook 2002 have the annoying bug that the
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mail states an UTF-8 content encoding but the actual iCalendar content is
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encoding in Latin-1 (or Windows Western?).
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As a result the content decoding will fail (TODO: always?). In this case we
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try to decode with Latin-1.
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Note: we could check for the Outlook x-mailer, but it was considered better
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to try Latin-1 as a fallback in any case (be tolerant).
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*/
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bodyString = [[NSString alloc] initWithData: self
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encoding: NSISOLatin1StringEncoding];
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if (!bodyString)
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[self errorWithFormat: @"an attempt to use"
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@" NSISOLatin1StringEncoding as callback failed"];
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[bodyString autorelease];
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}
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return bodyString;
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}
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/*
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* Excpected form is: "=?charset?encoding?encoded text?=".
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*/
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- (NSString *) decodedHeader
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{
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const char *cData;
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unsigned int len, i, j;
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NSString *decodedString;
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cData = [self bytes];
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len = [self length];
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decodedString = nil;
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if (len)
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{
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if (len > 6)
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{
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// Find beginning of encoded text
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i = 1;
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while ((*cData != '=' || *(cData+1) != '?') && i < len)
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{
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cData++;
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i++;
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}
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if (*cData == '=' && *(cData+1) == '?')
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{
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NSString *enc;
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if (i > 1)
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decodedString = [[[NSString alloc] initWithData: [self subdataWithRange: NSMakeRange(0, (i-1))]
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encoding: NSASCIIStringEncoding] autorelease];
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cData += 2; // skip "=?"
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i++;
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j = i;
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// Find next "?"
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while (*cData != '?' && j < len)
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{
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cData++;
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j++;
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}
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enc = [[[NSString alloc] initWithData:[self subdataWithRange: NSMakeRange(i, j-i)]
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encoding: NSASCIIStringEncoding] autorelease];
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i = j + 3; // skip "?q?"
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if (i < (len-2))
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{
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NSData *d;
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BOOL isQuotedPrintable = NO;
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cData++;
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// We check if we have a QP or Base64 encoding
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if (*cData == 'q' || *cData == 'Q')
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isQuotedPrintable = YES;
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// Find end of encoded text
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j = i;
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cData += 2; // skip "q?"
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while ((*cData != '?' || *(cData+1) != '=') && (j+1) < len)
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{
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cData++;
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j++;
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}
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d = [self subdataWithRange: NSMakeRange(i, j-i)];
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if (isQuotedPrintable)
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d = [d dataByDecodingQuotedPrintable];
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else
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d = [d dataByDecodingBase64];
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if (decodedString)
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{
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decodedString = [NSString stringWithFormat: @"%@%@",
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decodedString, [NSString stringWithData: d
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usingEncodingNamed: enc]];
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}
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else
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decodedString = [NSString stringWithData: d
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usingEncodingNamed: enc];
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j += 2; // skip "?="
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if (j < len)
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{
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// Recursively decode the remaining part
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decodedString = [NSString stringWithFormat: @"%@%@",
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decodedString,
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[[self subdataWithRange: NSMakeRange(j, len-j)] decodedHeader]];
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}
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}
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else
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decodedString = nil;
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}
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}
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if (!decodedString)
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{
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decodedString
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= [[NSString alloc] initWithData: self
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encoding: NSUTF8StringEncoding];
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if (!decodedString)
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decodedString
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= [[NSString alloc] initWithData: self
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encoding: NSISOLatin1StringEncoding];
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[decodedString autorelease];
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}
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}
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else
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decodedString = @"";
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return decodedString;
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}
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@end
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