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#import "XADPPMdParser.h"
#import "XADPPMdHandles.h"
#import "NSDateXAD.h"
#import "XADCRCHandle.h"
@implementation XADPPMdParser
+(int)requiredHeaderSize { return 16; }
+(BOOL)recognizeFileWithHandle:(CSHandle *)handle firstBytes:(NSData *)data name:(NSString *)name;
{
const uint8_t *bytes=[data bytes];
int length=[data length];
if(length<16) return NO;
if(bytes[0]==0x84&&bytes[1]==0xac&&bytes[2]==0xaf&&bytes[3]==0x8f) return YES;
if(bytes[3]==0x84&&bytes[2]==0xac&&bytes[1]==0xaf&&bytes[0]==0x8f) return YES;
return NO;
}
-(void)parse
{
CSHandle *fh=[self handle];
uint32_t signature=[fh readID];
BOOL bigendian;
if(signature==0x84acaf8f) bigendian=YES;
else bigendian=NO;
uint32_t attrib;
int info,namelen,time,date;
if(bigendian)
{
attrib=[fh readUInt32BE];
info=[fh readUInt16BE];
namelen=[fh readUInt16BE];
time=[fh readUInt16BE];
date=[fh readUInt16BE];
}
else
{
attrib=[fh readUInt32LE];
info=[fh readUInt16LE];
namelen=[fh readUInt16LE];
time=[fh readUInt16LE];
date=[fh readUInt16LE];
}
int maxorder=(info&0x0f)+1;
int suballocsize=((info>>4)&0xff)+1;
int variant=(info>>12)+'A';
int modelrestoration;
if(variant>='I')
{
modelrestoration=namelen>>14;
namelen&=0x3fff;
}
else modelrestoration=-1;
NSData *filename=[fh readDataOfLength:namelen];
NSMutableDictionary *dict=[NSMutableDictionary dictionaryWithObjectsAndKeys:
// TODO: Should this really be XADEitherPathSeparator?
[self XADPathWithData:filename separators:XADEitherPathSeparator],XADFileNameKey,
[self XADStringWithString:[NSString stringWithFormat:@"PPMd Variant %c",variant]],XADCompressionNameKey,
[NSNumber numberWithUnsignedLongLong:[fh offsetInFile]],XADDataOffsetKey,
[NSNumber numberWithInt:maxorder],@"PPMdMaxOrder",
[NSNumber numberWithInt:variant],@"PPMdVariant",
[NSNumber numberWithInt:suballocsize],@"PPMdSubAllocSize",
nil];
if(modelrestoration>=0)
[dict setObject:[NSNumber numberWithInt:modelrestoration] forKey:@"PPMdModelRestoration"];
if(date&0xc000) // assume that the next highest bit is always set in unix dates and never in DOS (true until 2011)
{
[dict setObject:[NSDate dateWithTimeIntervalSince1970:(date<<16)|time] forKey:XADLastModificationDateKey];
[dict setObject:[NSNumber numberWithInt:attrib] forKey:XADPosixPermissionsKey];
}
else
{
[dict setObject:[NSDate XADDateWithMSDOSDateTime:(date<<16)|time] forKey:XADLastModificationDateKey];
[dict setObject:[NSNumber numberWithInt:attrib] forKey:XADWindowsFileAttributesKey];
}
off_t filesize=[fh fileSize];
if(filesize!=CSHandleMaxLength)
[dict setObject:[NSNumber numberWithUnsignedLongLong:filesize-16-namelen] forKey:XADCompressedSizeKey];
[self addEntryWithDictionary:dict];
}
-(CSHandle *)handleForEntryWithDictionary:(NSDictionary *)dict wantChecksum:(BOOL)checksum
{
CSHandle *handle=[self handleAtDataOffsetForDictionary:dict];
int variant=[[dict objectForKey:@"PPMdVariant"] intValue];
int maxorder=[[dict objectForKey:@"PPMdMaxOrder"] intValue];
int suballocsize=[[dict objectForKey:@"PPMdSubAllocSize"] intValue];
switch(variant)
{
case 'G':
return [XADCRCHandle IEEECRC32HandleWithHandle:
[[[XADPPMdVariantGHandle alloc] initWithHandle:handle maxOrder:maxorder subAllocSize:suballocsize<<20] autorelease]
length:13745624 correctCRC:0xc1c1c00a conditioned:YES];
case 'H':
return [XADCRCHandle IEEECRC32HandleWithHandle:
[[[XADPPMdVariantHHandle alloc] initWithHandle:handle maxOrder:maxorder subAllocSize:suballocsize<<20] autorelease]
// length:20259 correctCRC:0xb4e8f7a1 conditioned:YES];
length:13745624 correctCRC:0xc1c1c00a conditioned:YES];
case 'I':
return [XADCRCHandle IEEECRC32HandleWithHandle:
[[[XADPPMdVariantIHandle alloc] initWithHandle:handle maxOrder:maxorder subAllocSize:suballocsize<<20
modelRestorationMethod:[[dict objectForKey:@"PPMdModelRestoration"] intValue]] autorelease]
// length:8559 correctCRC:0xb193cc7d conditioned:YES];
length:13745624 correctCRC:0xc1c1c00a conditioned:YES];
default: return nil;
}
}
-(NSString *)formatName { return @"PPMd"; }
@end
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