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Re: [Lzip-bug] bug in error output with corrupted lzip files

From: Lloyd Hilaiel
Subject: Re: [Lzip-bug] bug in error output with corrupted lzip files
Date: Mon, 9 Feb 2009 09:12:00 -0700

On Feb 9, 2009, at 8:30 AM, Antonio Diaz Diaz wrote:


Lloyd Hilaiel wrote:
foo.tar.1.lz: trailer truncated at trailer position 0; some checks may fail.
bad crc for uncompressed data; expected 00000000, obtained E44173E6.
bad uncompressed size; expected 0, obtained 297944.
lzip: Deleting output file `foo.tar.1', if it exists.
I'm guessing that the expected and obtained values are flipped?

I think not. The compressor stores in the member trailer the CRC and size of the uncompressed data. Then the decompressor compares the CRC and size "obtained" during decompression with those stored in the trailer (the "expected" ones).

If the trailer is corrupt, the "expected" values will be wrong.

Aha, I had thought the decompressor would "expect" a certain CRC and size based on its presence in the trailer, and then compare then with values "obtained" while decompressing the stream. Silly me. Perhaps 'calculated' is clearer than 'obtained'?


Best regards,

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