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#import "XADCrunchParser.h"
#import "XADCrunchHandles.h"
#import "XADRLE90Handle.h"
#import "XADChecksumHandle.h"
#import "NSDateXAD.h"
@implementation XADCrunchParser
+(NSMutableDictionary *)parseWithHandle:(CSHandle *)fh endOffset:(off_t)end parser:(XADArchiveParser *)parser
{
int magic=[fh readUInt8];
if(magic!=0x76) return nil;
int type=[fh readUInt8];
if(type!=0xfe && type!=0xfd) return nil;
NSMutableData *data=[NSMutableData data];
uint8_t byte;
while((byte=[fh readUInt8])) [data appendBytes:&byte length:1];
const char *bytes=[data bytes];
int length=[data length];
NSData *namepart=data;
NSData *comment=nil;
int namelength=length;
for(int i=0;i<length;i++)
{
if(bytes[i]=='.')
{
namelength=i+4;
if(namelength>length||bytes[namelength-1]==' ') namelength--;
if(namelength>length||bytes[namelength-1]==' ') namelength--;
if(namelength>length||bytes[namelength-1]==' ') namelength--;
namepart=[data subdataWithRange:NSMakeRange(0,namelength)];
if(i+7<length && bytes[i+4]==' ' && bytes[i+5]=='[' && bytes[length-1]==']')
comment=[data subdataWithRange:NSMakeRange(i+6,length-i-7)];
break;
}
}
int version1=[fh readUInt8];
int version2=[fh readUInt8];
int errordetection=[fh readUInt8];
[fh skipBytes:1];
NSString *compname;
BOOL old=(version2&0xf0)==0x10;
if(type==0xfe)
{
if(old) compname=@"LZW 1.0";
else compname=@"LZW 2.0";
}
else
{
if(old) compname=@"LZHUF 1.0";
else compname=@"LZHUF 2.0";
}
off_t dataoffset=[fh offsetInFile];
NSMutableDictionary *dict=[NSMutableDictionary dictionaryWithObjectsAndKeys:
[parser XADPathWithData:namepart separators:XADNoPathSeparator],XADFileNameKey,
[parser XADStringWithString:compname],XADCompressionNameKey,
[NSNumber numberWithLongLong:end-dataoffset-2],XADCompressedSizeKey,
[NSNumber numberWithUnsignedLongLong:dataoffset],XADDataOffsetKey,
[NSNumber numberWithLongLong:end-dataoffset],XADDataLengthKey,
[NSNumber numberWithInt:type],@"CrunchType",
[NSNumber numberWithInt:version1],@"CrunchReferenceRevision",
[NSNumber numberWithInt:version2],@"CrunchSignificantRevision",
[NSNumber numberWithInt:errordetection],@"CrunchErrorDetection",
nil];
if(comment) [dict setObject:[parser XADStringWithData:comment] forKey:XADCommentKey];
return dict;
}
+(CSHandle *)handleForEntryWithDictionary:(NSDictionary *)dict wantChecksum:(BOOL)checksum handle:(CSHandle *)handle
{
int type=[[dict objectForKey:@"CrunchType"] intValue];
int version2=[[dict objectForKey:@"CrunchSignificantRevision"] intValue];
int errordetection=[[dict objectForKey:@"CrunchErrorDetection"] intValue];
BOOL old=(version2&0xf0)==0x10;
BOOL haschecksum=errordetection==0;
if(type==0xfe) handle=[[[XADCrunchZHandle alloc] initWithHandle:handle old:old hasChecksum:haschecksum] autorelease];
else handle=[[[XADCrunchYHandle alloc] initWithHandle:handle old:old hasChecksum:haschecksum] autorelease];
return handle;
}
+(int)requiredHeaderSize { return 1024; }
+(BOOL)recognizeFileWithHandle:(CSHandle *)handle firstBytes:(NSData *)data name:(NSString *)name
{
const uint8_t *bytes=[data bytes];
int length=[data length];
if(length<9) return NO;
if(bytes[0]!=0x76 || (bytes[1]!=0xfe && bytes[1]!=0xfd)) return NO;
if(bytes[2]==0) return NO;
for(int i=2;i<length;i++)
{
if(bytes[i]==0)
{
if(i+4>length) return NO;
if(bytes[i+1]<0x10||bytes[i+1]>0x2f) return NO;
if(bytes[i+2]<0x10||bytes[i+2]>0x2f) return NO;
return YES;
}
//if(bytes[i]<32) return NO;
}
return NO;
}
-(void)parse
{
CSHandle *fh=[self handle];
NSMutableDictionary *dict=[XADCrunchParser parseWithHandle:fh
endOffset:[fh fileSize] parser:self];
XADPath *filename=[dict objectForKey:XADFileNameKey];
NSData *namedata=[filename data];
const char *bytes=[namedata bytes];
int length=[namedata length];
if(length>4)
if(bytes[length-4]=='.')
if(tolower(bytes[length-3])=='l')
if(tolower(bytes[length-2])=='b')
if(tolower(bytes[length-1])=='r')
{
[dict setObject:[NSNumber numberWithBool:YES] forKey:XADIsArchiveKey];
}
[self addEntryWithDictionary:dict];
}
-(CSHandle *)handleForEntryWithDictionary:(NSDictionary *)dict wantChecksum:(BOOL)checksum
{
CSHandle *handle=[self handleAtDataOffsetForDictionary:dict];
return [XADCrunchParser handleForEntryWithDictionary:dict wantChecksum:checksum handle:handle];
}
-(NSString *)formatName { return @"Crunch"; }
@end
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