zlib unpacker [Request]

[fatduck]

Thanks, by the way, could this offset value support hex input as well(eg: 0x10C). Because most of the time when we looking at the hex data, we use hex offset!

Thanks once again!

[Rheini]

The idea isn't bad, but I won't implement that (maybe later) since every good hex editor provides both hex and decimal offsets, furthermore this version of the tool is meant to be also used in automatic processing.

Might take some time til it's finished since I'm completely rewriting the tool in another programming language (D)

I still have some file scanner code lying around here, another possible feature would be an automatic extraction of all zlibbed files contained in an archive. But this is just a thought atm

[asmxtx]

Here is a command line unpacker for ZLIB compressed data files.

Syntax:

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INFLATE <compr_file> [decompr_file | [0x]offset [decompr_file]]

compr_file: Container file which consists of jointed ZLIB data streams. Must be given on the command line.
decompr_file: Name of the decompressed file. Optional.
offset: Offset within compr_file where the ZLIB stream starts. Optional.

Example:

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INFLATE data.dat

Extracts the first ZLIB stream at offset 0 from DATA.DAT and names it DATA.DXX.

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INFLATE data.dat 17

Extracts the ZLIB stream from offset 0x11 (11hex, 17dez) from DATA.DAT and names it DATA.DXX.

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INFLATE data.dat extr.zlb

Extracts the first ZLIB stream at offset 0 from DATA.DAT and names it EXTR.ZLB.

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INFLATE data.dat 0x111 extr.zlb

Extracts the ZLIB stream from offset 0x111 (273dec) from DATA.DAT and names it EXTR.ZLB

Error codes: 0 - OK
1 - wrong parameters
2 - error opening input file
3 - error opening output file
4 - error ZLIB-initialization
5 - error during decompression
6 - error writing destination file
7 - given offset not in file range

(updated Sep 29, 2008)

[fatduck]

Hi asmxtx, I found a little problem with your tool here!
If I set the offset to 0x08, your tool won't deflate the file. But when I cut out the first 8 bytes and deflate with your tool, it works, it works!(even thought it said data error)

And I yes, I can use other tools (like zlibc, offzip) to deflate it without error!

[asmxtx]

The problem should be solved now.
I didn't subtract the offset from the input size. This let ZLIB read random data beyond the input buffer if the compressed source was a not terminated stream like in your file. (Download link updated.)

[deve]

[Rheini]

zlibc is not meant to be an archiver.
It is designed to de-/compress raw zlib streams.

[i404401]

@ Rheini : Thank you for your tool, it saved up my time.
Thanks to others who share their ideas here too.