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#import "XADStuffItSplitParser.h"
#import "CSMultiHandle.h"
#import "CSFileHandle.h"
#import "NSDateXAD.h"
@implementation XADStuffItSplitParser
+(int)requiredHeaderSize { return 100; }
+(BOOL)recognizeFileWithHandle:(CSHandle *)handle firstBytes:(NSData *)data name:(NSString *)name
{
const uint8_t *bytes=[data bytes];
int length=[data length];
if(length<100) return NO;
if(bytes[0]!=0xb0) return NO;
if(bytes[1]!=0x56) return NO;
if(bytes[2]!=0x00) return NO; // Assume there are less than 256 parts.
if(bytes[4]==0) return NO;
if(bytes[4]>63) return NO;
for(int i=0;i<bytes[4];i++) if(bytes[5+i]==0) return NO;
return YES;
}
+(NSArray *)volumesForHandle:(CSHandle *)handle firstBytes:(NSData *)data name:(NSString *)name
{
const uint8_t *bytes=[data bytes];
NSString *basename=[[name lastPathComponent] stringByDeletingPathExtension];
NSString *dirname=[name stringByDeletingLastPathComponent];
#if MAC_OS_X_VERSION_MIN_REQUIRED>=1050
NSArray *dircontents=[[NSFileManager defaultManager] contentsOfDirectoryAtPath:dirname error:NULL];
#else
NSArray *dircontents=[[NSFileManager defaultManager] directoryContentsAtPath:dirname];
#endif
NSString *parts[256]={nil};
NSEnumerator *enumerator=[dircontents objectEnumerator];
NSString *filename;
while((filename=[enumerator nextObject]))
{
if(![filename hasPrefix:basename]) continue;
NSString *fullpath=[dirname stringByAppendingPathComponent:filename];
@try
{
CSFileHandle *filehandle=[CSFileHandle fileHandleForReadingAtPath:fullpath];
uint8_t header[100];
int actual=[filehandle readAtMost:sizeof(header) toBuffer:header];
if(actual<sizeof(header)) continue;
if(header[0]!=0xb0) continue;
if(header[1]!=0x56) continue;
if(header[2]!=0x00) continue;
if(header[4]!=bytes[4]) continue;
if(memcmp(&header[5],&bytes[5],header[4])!=0) continue;
if(memcmp(&header[68],&bytes[68],26)!=0) continue;
int partnum=header[3];
parts[partnum]=fullpath;
[filehandle close];
}
@catch(id e) {}
}
NSMutableArray *volumes=[NSMutableArray array];
for(int i=1;i<256;i++)
{
if(!parts[i]) break;
[volumes addObject:parts[i]];
}
return volumes;
}
-(void)parse
{
CSHandle *fh=[self handle];
NSArray *handles=[self volumes];
if(!handles) handles=[NSArray arrayWithObject:fh];
XADSkipHandle *sh=[self skipHandle];
off_t curroffset=0;
NSEnumerator *enumerator=[handles objectEnumerator];
CSHandle *handle;
while((handle=[enumerator nextObject]))
{
[sh addSkipFrom:curroffset length:100];
off_t volumesize=[handle fileSize];
curroffset+=volumesize;
}
[fh skipBytes:4];
int namelength=[fh readUInt8];
NSData *namedata=[fh readDataOfLength:namelength];
[fh seekToFileOffset:68];
uint32_t type=[fh readUInt32BE];
uint32_t creator=[fh readUInt32BE];
int finderflags=[fh readUInt16BE];
uint32_t creation=[fh readUInt32BE];
uint32_t modification=[fh readUInt32BE];
uint32_t rsrclength=[fh readUInt32BE];
uint32_t datalength=[fh readUInt32BE];
BOOL isarchive=NO;
const uint8_t *namebytes=[namedata bytes];
if(namelength>4)
if(namebytes[namelength-4]=='.')
if(namebytes[namelength-3]=='s'||namebytes[namelength-3]=='S')
if(namebytes[namelength-2]=='i'||namebytes[namelength-2]=='I')
if(namebytes[namelength-1]=='t'||namebytes[namelength-1]=='T')
isarchive=YES;
if(namelength>4)
if(namebytes[namelength-4]=='.')
if(namebytes[namelength-3]=='s'||namebytes[namelength-3]=='S')
if(namebytes[namelength-2]=='e'||namebytes[namelength-2]=='E')
if(namebytes[namelength-1]=='a'||namebytes[namelength-1]=='A')
isarchive=YES;
if(rsrclength)
{
NSMutableDictionary *dict=[NSMutableDictionary dictionaryWithObjectsAndKeys:
[self XADPathWithData:namedata separators:XADNoPathSeparator],XADFileNameKey,
[NSNumber numberWithLongLong:rsrclength],XADFileSizeKey,
[NSNumber numberWithLongLong:curroffset*rsrclength/(datalength+rsrclength)],XADCompressedSizeKey,
[NSNumber numberWithLongLong:0],XADSkipOffsetKey,
[NSNumber numberWithLongLong:rsrclength],XADSkipLengthKey,
[NSNumber numberWithUnsignedInt:type],XADFileTypeKey,
[NSNumber numberWithUnsignedInt:creator],XADFileCreatorKey,
[NSNumber numberWithInt:finderflags],XADFinderFlagsKey,
[NSDate XADDateWithTimeIntervalSince1904:creation],XADCreationDateKey,
[NSDate XADDateWithTimeIntervalSince1904:modification],XADLastModificationDateKey,
[NSNumber numberWithBool:YES],XADIsResourceForkKey,
nil];
if(isarchive) [dict setObject:[NSNumber numberWithBool:YES] forKey:XADIsArchiveKey];
[self addEntryWithDictionary:dict];
}
if(datalength || !rsrclength)
{
NSMutableDictionary *dict=[NSMutableDictionary dictionaryWithObjectsAndKeys:
[self XADPathWithData:namedata separators:XADNoPathSeparator],XADFileNameKey,
[NSNumber numberWithLongLong:datalength],XADFileSizeKey,
[NSNumber numberWithLongLong:curroffset*datalength/(datalength+rsrclength)],XADCompressedSizeKey,
[NSNumber numberWithLongLong:rsrclength],XADSkipOffsetKey,
[NSNumber numberWithLongLong:datalength],XADSkipLengthKey,
[NSNumber numberWithUnsignedInt:type],XADFileTypeKey,
[NSNumber numberWithUnsignedInt:creator],XADFileCreatorKey,
[NSNumber numberWithInt:finderflags],XADFinderFlagsKey,
[NSDate XADDateWithTimeIntervalSince1904:creation],XADCreationDateKey,
[NSDate XADDateWithTimeIntervalSince1904:modification],XADLastModificationDateKey,
nil];
if(isarchive) [dict setObject:[NSNumber numberWithBool:YES] forKey:XADIsArchiveKey];
[self addEntryWithDictionary:dict];
}
}
-(CSHandle *)handleForEntryWithDictionary:(NSDictionary *)dict wantChecksum:(BOOL)checksum
{
CSHandle *handle=[self handleAtDataOffsetForDictionary:dict];
return handle;
}
-(NSString *)formatName { return @"StuffIt split file"; }
@end
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