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#define S_SIGNATURE 0
#define S_NUMFILES 4
#define S_ARCLENGTH 6
#define S_SIGNATURE2 10
#define S_VERSION 14
#define SITHDRSIZE 22
#define F_COMPRMETHOD 0
#define F_COMPDMETHOD 1
#define F_FNAME 2
#define F_FTYPE 66
#define F_CREATOR 70
#define F_FNDRFLAGS 74
#define F_CREATIONDATE 76
#define F_MODDATE 80
#define F_RSRCLENGTH 84
#define F_DATALENGTH 88
#define F_COMPRLENGTH 92
#define F_COMPDLENGTH 96
#define F_RSRCCRC 100
#define F_DATACRC 102
#define F_HDRCRC 110
#define FILEHDRSIZE 112
typedef long OSType;
struct sitHdr { /* 22 bytes */
OSType signature; /* = 'SIT!' -- for verification */
unsigned short numFiles; /* number of files in archive */
unsigned long arcLength; /* length of entire archive incl.
hdr. -- for verification */
OSType signature2; /* = 'rLau' -- for verification */
unsigned char version; /* version number */
char reserved[7];
};
struct fileHdr { /* 112 bytes */
unsigned char compRMethod; /* rsrc fork compression method */
unsigned char compDMethod; /* data fork compression method */
unsigned char fName[64]; /* a STR63 */
OSType fType; /* file type */
OSType fCreator; /* er... */
unsigned short FndrFlags; /* copy of Finder flags. For our
purposes, we can clear:
busy,onDesk */
unsigned long creationDate;
unsigned long modDate; /* !restored-compat w/backup prgms */
unsigned long rsrcLength; /* decompressed lengths */
unsigned long dataLength;
unsigned long compRLength; /* compressed lengths */
unsigned long compDLength;
unsigned short rsrcCRC; /* crc of rsrc fork */
unsigned short dataCRC; /* crc of data fork */
char reserved[6];
unsigned short hdrCRC; /* crc of file header */
};
/* file format is:
sitArchiveHdr
file1Hdr
file1RsrcFork
file1DataFork
file2Hdr
file2RsrcFork
file2DataFork
.
.
.
fileNHdr
fileNRsrcFork
fileNDataFork
*/
/* compression methods */
#define nocomp 0 /* just read each byte and write it to archive */
#define rle 1 /* RLE compression */
#define lzc 2 /* LZC compression */
#define huffman 3 /* Huffman compression */
#define lzah 5 /* LZ with adaptive Huffman */
#define fixhuf 6 /* Fixed Huffman table */
#define mw 8 /* Miller-Wegman encoding */
/* this bit says whether the file is protected or not */
#define prot 16 /* password protected bit */
/* rsrc & data compress are identical here: */
#define sfolder 32 /* start of folder */
#define efolder 33 /* end of folder */
#define sknown 0x16f /* known compression methods */
/* all other numbers are reserved */
#define ESC 0x90 /* repeat packing escape */
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