mirror of
https://github.com/MacPaw/XADMaster.git
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74 lines
2.5 KiB
Objective-C
74 lines
2.5 KiB
Objective-C
/*
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* XADXZParser.m
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*
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* Copyright (c) 2017-present, MacPaw Inc. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*/
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#import "XADXZParser.h"
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#import "XADXZHandle.h"
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@implementation XADXZParser
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+(int)requiredHeaderSize { return 6; }
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+(BOOL)recognizeFileWithHandle:(CSHandle *)handle firstBytes:(NSData *)data name:(NSString *)name;
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{
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const uint8_t *bytes=[data bytes];
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int length=[data length];
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if(length<6) return NO;
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// return bytes[0]==0xff&&bytes[1]=='L'&&bytes[2]=='Z'&&bytes[3]=='M'&&bytes[4]=='A'&&bytes[5]==0;
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return bytes[0]==0xfd&&bytes[1]=='7'&&bytes[2]=='z'&&bytes[3]=='X'&&bytes[4]=='Z'&&bytes[5]==0;
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}
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-(void)parse
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{
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NSString *name=[self name];
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NSString *extension=[[name pathExtension] lowercaseString];
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NSString *contentname;
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if([extension isEqual:@"txz"]) contentname=[[name stringByDeletingPathExtension] stringByAppendingPathExtension:@"tar"];
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else contentname=[name stringByDeletingPathExtension];
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// TODO: set no filename flag
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NSMutableDictionary *dict=[NSMutableDictionary dictionaryWithObjectsAndKeys:
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[self XADPathWithUnseparatedString:contentname],XADFileNameKey,
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[self XADStringWithString:@"LZMA2"],XADCompressionNameKey,
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nil];
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if([contentname matchedByPattern:@"\\.(tar|cpio|pax|warc)$" options:REG_ICASE])
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[dict setObject:[NSNumber numberWithBool:YES] forKey:XADIsArchiveKey];
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off_t filesize=[[self handle] fileSize];
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if(filesize!=CSHandleMaxLength)
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[dict setObject:[NSNumber numberWithUnsignedLongLong:filesize] forKey:XADCompressedSizeKey];
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[self addEntryWithDictionary:dict];
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}
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-(CSHandle *)handleForEntryWithDictionary:(NSDictionary *)dictionary wantChecksum:(BOOL)checksum
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{
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CSHandle *handle=[self handle];
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[handle seekToFileOffset:0];
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return [[[XADXZHandle alloc] initWithHandle:handle] autorelease];
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}
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-(NSString *)formatName { return @"XZ"; }
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@end
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