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#import "XADCompactProParser.h"
#import "XADCompactProRLEHandle.h"
#import "XADCompactProLZHHandle.h"
#import "XADException.h"
#import "XADCRCHandle.h"
#import "NSDateXAD.h"
@implementation XADCompactProParser
+(int)requiredHeaderSize { return 8; }
+(BOOL)recognizeFileWithHandle:(CSHandle *)handle firstBytes:(NSData *)data name:(NSString *)name
{
const uint8_t *bytes=[data bytes];
int length=[data length];
if(length<8) return NO;
if(bytes[0]!=1) return NO;
uint32_t offset=CSUInt32BE(bytes+4);
off_t filesize=[handle fileSize];
if(filesize==CSHandleMaxLength) return [name matchedByPattern:@"\\.(cpt|sea)" options:REG_ICASE];
if(offset+7>filesize) return NO;
@try
{
[handle seekToFileOffset:offset];
uint32_t correctcrc=[handle readUInt32BE];
uint8_t buf[256];
uint32_t crc=0xffffffff;
[handle readBytes:3 toBuffer:buf];
crc=XADCalculateCRC(crc,buf,3,XADCRCTable_edb88320);
int numentries=CSUInt16BE(buf);
int commentsize=buf[2];
[handle readBytes:commentsize toBuffer:buf];
crc=XADCalculateCRC(crc,buf,commentsize,XADCRCTable_edb88320);
for(int i=0;i<numentries;i++)
{
int namelen=[handle readUInt8];
crc=XADCRC(crc,namelen,XADCRCTable_edb88320);
[handle readBytes:namelen&0x7f toBuffer:buf];
crc=XADCalculateCRC(crc,buf,namelen&0x7f,XADCRCTable_edb88320);
int metadatasize;
if(namelen&0x80) metadatasize=2;
else metadatasize=45;
[handle readBytes:metadatasize toBuffer:buf];
crc=XADCalculateCRC(crc,buf,metadatasize,XADCRCTable_edb88320);
}
if(crc==correctcrc) return YES;
}
@catch(id e) {}
return NO;
}
-(void)parse
{
[self setIsMacArchive:YES];
CSHandle *fh=[self handle];
/*int marker=*/[fh readUInt8];
/*int volume=*/[fh readUInt8];
/*int xmagic=*/[fh readUInt16BE];
uint32_t offset=[fh readUInt32BE];
[fh seekToFileOffset:offset];
/*uint32_t headcrc=*/[fh readUInt32BE];
int numentries=[fh readUInt16BE];
int commentlen=[fh readUInt8];
if(commentlen)
{
NSData *comment=[fh readDataOfLength:commentlen];
[self setObject:[self XADStringWithData:comment] forPropertyKey:XADCommentKey];
}
NSMutableArray *entries=[NSMutableArray array];
// Since the recognizer has already verified that the metadata is intact, reading
// should be safe, so to avoid stream resets, we just collect entries into an array
// and send all of them out at once.
[self parseDirectoryWithPath:[self XADPath] numberOfEntries:numentries entryArray:entries];
NSEnumerator *enumerator=[entries objectEnumerator];
NSMutableDictionary *dict;
while((dict=[enumerator nextObject])) [self addEntryWithDictionary:dict];
}
-(BOOL)parseDirectoryWithPath:(XADPath *)parent numberOfEntries:(int)numentries entryArray:(NSMutableArray *)entries
{
CSHandle *fh=[self handle];
while(numentries)
{
if(![self shouldKeepParsing]) return NO;
int namelen=[fh readUInt8];
NSData *namedata=[fh readDataOfLength:namelen&0x7f];
XADPath *path=[parent pathByAppendingXADStringComponent:[self XADStringWithData:namedata]];
if(namelen&0x80)
{
int numdirentries=[fh readUInt16BE];
NSMutableDictionary *dict=[NSMutableDictionary dictionaryWithObjectsAndKeys:
path,XADFileNameKey,
[NSNumber numberWithBool:YES],XADIsDirectoryKey,
nil];
[entries addObject:dict];
if(![self parseDirectoryWithPath:path numberOfEntries:numdirentries entryArray:entries]) return NO;
numentries-=numdirentries+1;
}
else
{
int volume=[fh readUInt8];
uint32_t fileoffs=[fh readUInt32BE];
uint32_t type=[fh readUInt32BE];
uint32_t creator=[fh readUInt32BE];
uint32_t creationdate=[fh readUInt32BE];
uint32_t modificationdate=[fh readUInt32BE];
int finderflags=[fh readUInt16BE];
uint32_t crc=[fh readUInt32BE];
int flags=[fh readUInt16BE]; // TODO: bit 0 means encryption
uint32_t resourcelength=[fh readUInt32BE];
uint32_t datalength=[fh readUInt32BE];
uint32_t resourcecomplen=[fh readUInt32BE];
uint32_t datacomplen=[fh readUInt32BE];
if(resourcelength)
{
NSString *crckey;
if(datalength) crckey=@"CompactProSharedCRC32";
else crckey=@"CompactProCRC32";
NSMutableDictionary *dict=[NSMutableDictionary dictionaryWithObjectsAndKeys:
path,XADFileNameKey,
[NSNumber numberWithUnsignedInt:resourcelength],XADFileSizeKey,
[NSNumber numberWithUnsignedInt:resourcecomplen],XADCompressedSizeKey,
[NSDate XADDateWithTimeIntervalSince1904:modificationdate],XADLastModificationDateKey,
[NSDate XADDateWithTimeIntervalSince1904:creationdate],XADCreationDateKey,
[NSNumber numberWithUnsignedInt:type],XADFileTypeKey,
[NSNumber numberWithUnsignedInt:creator],XADFileCreatorKey,
[NSNumber numberWithInt:finderflags],XADFinderFlagsKey,
[self XADStringWithString:flags&2?@"LZH+RLE":@"RLE"],XADCompressionNameKey,
[NSNumber numberWithBool:YES],XADIsResourceForkKey,
[NSNumber numberWithUnsignedInt:resourcecomplen],XADDataLengthKey,
[NSNumber numberWithLongLong:fileoffs],XADDataOffsetKey,
[NSNumber numberWithBool:flags&2?YES:NO],@"CompactProLZH",
[NSNumber numberWithInt:flags],@"CompactProFlags",
[NSNumber numberWithUnsignedInt:crc],crckey,
[NSNumber numberWithUnsignedInt:volume],@"CompactProVolume",
nil];
[entries addObject:dict];
}
if(datalength||resourcelength==0)
{
NSString *crckey;
if(resourcelength) crckey=@"CompactProSharedCRC32";
else crckey=@"CompactProCRC32";
NSMutableDictionary *dict=[NSMutableDictionary dictionaryWithObjectsAndKeys:
path,XADFileNameKey,
[NSNumber numberWithUnsignedInt:datalength],XADFileSizeKey,
[NSNumber numberWithUnsignedInt:datacomplen],XADCompressedSizeKey,
[NSDate XADDateWithTimeIntervalSince1904:modificationdate],XADLastModificationDateKey,
[NSDate XADDateWithTimeIntervalSince1904:creationdate],XADCreationDateKey,
[NSNumber numberWithUnsignedInt:type],XADFileTypeKey,
[NSNumber numberWithUnsignedInt:creator],XADFileCreatorKey,
[NSNumber numberWithInt:finderflags],XADFinderFlagsKey,
[self XADStringWithString:flags&4?@"LZH+RLE":@"RLE"],XADCompressionNameKey,
[NSNumber numberWithLongLong:fileoffs+resourcecomplen],XADDataOffsetKey,
[NSNumber numberWithUnsignedInt:datacomplen],XADDataLengthKey,
[NSNumber numberWithBool:flags&4?YES:NO],@"CompactProLZH",
[NSNumber numberWithInt:flags],@"CompactProFlags",
[NSNumber numberWithUnsignedInt:crc],crckey,
[NSNumber numberWithUnsignedInt:volume],@"CompactProVolume",
nil];
[entries addObject:dict];
}
numentries--;
}
}
return YES;
}
-(CSHandle *)handleForEntryWithDictionary:(NSDictionary *)dict wantChecksum:(BOOL)checksum
{
CSHandle *handle=[self handleAtDataOffsetForDictionary:dict];
off_t size=[[dict objectForKey:XADFileSizeKey] longLongValue];
if([[dict objectForKey:@"CompactProLZH"] boolValue])
handle=[[[XADCompactProLZHHandle alloc] initWithHandle:handle blockSize:0x1fff0] autorelease];
handle=[[[XADCompactProRLEHandle alloc] initWithHandle:handle length:size] autorelease];
NSNumber *crc=[dict objectForKey:@"CompactProCRC32"];
if(checksum&&crc)
handle=[XADCRCHandle IEEECRC32HandleWithHandle:handle length:size correctCRC:~[crc unsignedIntValue] conditioned:YES];
return handle;
}
-(NSString *)formatName { return @"Compact Pro"; }
@end
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