lbrextract.py is a Python 3 command line script that extract files contained
in an LBR archive.
LBR archives are used under the CP/M operating system. They contain files with no compression at all but with CRC checks.
More information about LBR archives and its file format.
The script takes one parameter, the archive file name, and extracts its content in the current directory.
Ex:
$ python3 lbrextract.py 3pmtp2.lbr
*** Invalid CRC for the directory ***
S FILENAME OFFSET LENGTH CRC CREATION MODIFICATION
- -------- ------- ------- ---- ------------------- -------------------
+ SPPMAIN.CMD 896 128 B926 no-date no-date
+ SB001.CMD 1024 128 337A no-date no-date
+ SB006.CMD 1152 128 5213 no-date no-date
+ SB007.CMD 1280 128 8919 no-date no-date
+ E2.CMD 1408 128 F2A7 no-date no-date
+ E3.CMD 1536 128 AE3D no-date no-date
+ SB003.CMD 1664 128 6B0B no-date no-date
+ SB004.CMD 1792 128 8D40 no-date no-date
+ SB008.CMD 1920 128 92D6 no-date no-date
+ SB00A.CMD 2048 128 4188 no-date no-date
+ LINKSPP.SUB 2176 256 3453 no-date no-date
+ SBIFDEF.LIB 2432 896 816F no-date no-date
+ SMALLERR.TXT 3328 1152 E173 no-date no-date
+ SPP.004 4480 12672 F614 no-date no-date
+ SPP.002 17152 27648 14D6 no-date no-date
+ SPP.COM 44800 5376 AF80 no-date no-date
+ SPP.001 50176 6272 0856 no-date no-date
+ SPP.007 56448 1792 EB6B no-date no-date
+ SPP.006 58240 5376 9215 no-date no-date
+ SPP.008 63616 13056 02C1 no-date no-date
+ SPP.009 76672 6528 02CD no-date no-date
+ SPP.003 83200 14464 EF00 no-date no-date
+ SPP.00A 97664 13056 4CF6 no-date no-date
- 0 0 0000 no-date no-date
- 0 0 0000 no-date no-date
- 0 0 0000 no-date no-date
- 0 0 0000 no-date no-date
The first column indicates the entry state. A + indicates a valid entry. A -
indicates a deleted or unused entry.
Creation date and modification date are optional.
File length is usually a multiple of 128. The extraction understands precise file length when the archive uses it.
If the directory CRC is wrong, the extraction still occurs.
If the file CRC is wrong, the extraction of the file does not occur.