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#import "XADXZParser.h"
#import "XADXZHandle.h"
@implementation XADXZParser
+(int)requiredHeaderSize { return 6; }
+(BOOL)recognizeFileWithHandle:(CSHandle *)handle firstBytes:(NSData *)data name:(NSString *)name;
{
const uint8_t *bytes=[data bytes];
int length=[data length];
if(length<6) return NO;
// return bytes[0]==0xff&&bytes[1]=='L'&&bytes[2]=='Z'&&bytes[3]=='M'&&bytes[4]=='A'&&bytes[5]==0;
return bytes[0]==0xfd&&bytes[1]=='7'&&bytes[2]=='z'&&bytes[3]=='X'&&bytes[4]=='Z'&&bytes[5]==0;
}
-(void)parse
{
NSString *name=[self name];
NSString *extension=[[name pathExtension] lowercaseString];
NSString *contentname;
if([extension isEqual:@"txz"]) contentname=[[name stringByDeletingPathExtension] stringByAppendingPathExtension:@"tar"];
else contentname=[name stringByDeletingPathExtension];
// TODO: set no filename flag
NSMutableDictionary *dict=[NSMutableDictionary dictionaryWithObjectsAndKeys:
[self XADPathWithUnseparatedString:contentname],XADFileNameKey,
[self XADStringWithString:@"LZMA2"],XADCompressionNameKey,
nil];
if([contentname matchedByPattern:@"\\.(tar|cpio)$" options:REG_ICASE])
[dict setObject:[NSNumber numberWithBool:YES] forKey:XADIsArchiveKey];
off_t filesize=[[self handle] fileSize];
if(filesize!=CSHandleMaxLength)
[dict setObject:[NSNumber numberWithUnsignedLongLong:filesize] forKey:XADCompressedSizeKey];
[self addEntryWithDictionary:dict];
}
-(CSHandle *)handleForEntryWithDictionary:(NSDictionary *)dictionary wantChecksum:(BOOL)checksum
{
CSHandle *handle=[self handle];
[handle seekToFileOffset:0];
return [[[XADXZHandle alloc] initWithHandle:handle] autorelease];
}
-(NSString *)formatName { return @"XZ"; }
@end
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