63 lines
2.2 KiB
Plaintext
63 lines
2.2 KiB
Plaintext
/*
|
|
* @(#)unpit.c 1.2 (CWI) 87/11/05
|
|
*/
|
|
|
|
/*
|
|
|
|
unpit - Macintosh PackIt file unpacker
|
|
|
|
Version 2, for PackIt II
|
|
|
|
This program will unpack a Macintosh PackIt file into separate files. The
|
|
data fork of a PackIt file contains both the data and resource forks of the
|
|
packed files. The program will unpack each Mac file into separate .data,
|
|
.rsrc., and .info files that can be downloaded to a Mac using macput.
|
|
|
|
The program syntax is much like macput/macget:
|
|
|
|
unpit [-rdu] packit-file.data
|
|
|
|
The -r and -d flags will cause only the resource and data forks to be
|
|
written. The -u flag will cause only the data fork to be written and
|
|
to have carriage return characters changed to Unix newline characters.
|
|
|
|
Some of the program is borrowed from the macput.c/macget.c programs.
|
|
|
|
Author: Allan G. Weber, (Weber%Brand@USC-ECL)
|
|
Date: September 30, 1985
|
|
Revised: January 24, 1986 - added CRC checking
|
|
March 25, 1986 - support compressed mode of PackIt II,
|
|
check for illegal Unix file names
|
|
|
|
*/
|
|
|
|
/* There is some confusion as to what to do with the "inited" flag in the
|
|
finder info bytes that are in the header of each file in the packit file.
|
|
If this flag bit is copied to the .info file, it seems to confuse
|
|
MacTerminal into placing the file icons in the upper left corner of the
|
|
window on top of each other. Setting this bit to zero in the .info file
|
|
seems to fix that problem but may cause others. I haven't been able to
|
|
find any .info files that have this flag set so making it zero may be OK.
|
|
Anyway, MacTerminal seems to set the flag when it create the file on the
|
|
Mac. The "#define INITED_BUG" can be used to try both settings. */
|
|
|
|
/*
|
|
Format of a Packit file:
|
|
|
|
Repeat the following sequence for each file in the Packit file:
|
|
|
|
4 byte identifier ("PMag" = not compressed, "Pma4" = compressed)
|
|
variable length compression data (if compressed file)
|
|
92 byte header (see struct pit_header below) *
|
|
2 bytes CRC number *
|
|
data fork (length from header) *
|
|
resource fork (length from header) *
|
|
2 bytes CRC number *
|
|
|
|
Last file is followed by the 4 byte Ascii string, "Pend", and then the EOF.
|
|
|
|
* these are in compressed form if compression is on for the file
|
|
|
|
*/
|
|
|