Bug#567041: [Patch] xxd: Fix lossy reverse conversion
James Vega
jamessan at debian.org
Mon Feb 8 04:04:48 UTC 2010
Bram,
As described below, xxd doesn't correctly convert free-form hex dumps to
their original form. Attached patch, from Jean-Baptiste Wons, fixes the
issue.
On Wed, Jan 27, 2010 at 12:15:11AM +0300, Nikolai Kondrashov wrote:
> The attached input file (logitech_precision_gamepad_hidrd.txt) is
> interpreted by xxd -r -p incorrectly. In effect, not according to manual,
> which states:
>
> Use the combination -r -p to read plain hexadecimal dumps without line
> number information and without a particular column layout. Additional
> Whitespace and line-breaks are allowed anywhere.
>
> The following command:
> cat logitech_precision_gamepad_hidrd.txt | xxd -r -p | hexdump -C
>
> results in the following output:
> 00000000 05 01 09 04 a1 01 a1 02 75 08 95 02 15 00 26 ff |........u.....&.|
> 00000010 25 01 45 01 05 09 19 01 29 0a 81 02 06 00 ff 75 |%.E.....)......u|
> 00000020
>
> which is incorrect.
>
> While the following command:
> cat logitech_precision_gamepad_hidrd.txt | tr -d ' \n' | xxd -r -p | hexdump -C
>
> results in the correct output:
> 00000000 05 01 09 04 a1 01 a1 02 75 08 95 02 15 00 26 ff |........u.....&.|
> 00000010 00 35 00 46 ff 00 09 30 09 31 81 02 75 01 95 0a |.5.F...0.1..u...|
> 00000020 25 01 45 01 05 09 19 01 29 0a 81 02 06 00 ff 75 |%.E.....)......u|
> 00000030 01 95 06 25 01 45 01 09 01 81 02 c0 c0 |...%.E.......|
> 0000003d
--
James
GPG Key: 1024D/61326D40 2003-09-02 James Vega <jamessan at debian.org>
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05 01 09 04 A1 01 A1 02 75 08 95 02 15 00 26 FF
00 35 00 46 FF 00 09 30 09 31 81 02 75 01 95 0A
25 01 45 01 05 09 19 01 29 0A 81 02 06 00 FF 75
01 95 06 25 01 45 01 09 01 81 02 C0 C0
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