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Ticket #1392: regression in .tar support 

Regression was introduced in lzma support
(a5ba278729)

All the heuristics stuff has been removed, only
LZMA utils 4.32.1 and later formats are supported.

Signed-off-by: Mikhail S. Pobolovets <styx.mp@gmail.com>
This commit is contained in:
Mikhail S. Pobolovets 2009-07-15 20:31:56 +03:00
parent 5894396494
commit ac2edf225e
1 changed files with 16 additions and 23 deletions
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35
src/util.c
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@ -882,28 +882,21 @@ get_compression_type (int fd)
}
}
/* LZMA files; both LZMA_Alone and LZMA utils formats. The LZMA_Alone
* format is used by the LZMA_Alone tool from LZMA SDK. The LZMA utils
* format is the default format of LZMA utils 4.32.1 and later. */
if (magic[0] < 0xE1 || (magic[0] == 0xFF && magic[1] == 'L' &&
magic[2] == 'Z' && magic[3] == 'M')) {
if (mc_read (fd, (char *) magic + 4, 9) == 9) {
/* Support for LZMA (only utils format with magic in header).
* This is the default format of LZMA utils 4.32.1 and later. */
if (mc_read(fd, (char *) magic+4, 1) == 1)
{
/* LZMA utils format */
if (magic[0] == 0xFF && magic[4] == 'A' && magic[5] == 0x00)
if
( magic[0] == 0xFF
&& magic[1] == 'L'
&& magic[2] == 'Z'
&& magic[3] == 'M'
&& magic[4] == 'A'
&& magic[5] == 0x00
)
return COMPRESSION_LZMA;
/* The LZMA_Alone format has no magic bytes, thus we
* need to play a wizard. This can give false positives,
* thus the detection below should be removed when
* the newer LZMA utils format has got popular. */
if (magic[0] < 0xE1 && magic[4] < 0x20 &&
((magic[10] == 0x00 && magic[11] == 0x00 &&
magic[12] == 0x00) ||
(magic[5] == 0xFF && magic[6] == 0xFF &&
magic[7] == 0xFF && magic[8] == 0xFF &&
magic[9] == 0xFF && magic[10] == 0xFF &&
magic[11] == 0xFF && magic[12] == 0xFF)))
return COMPRESSION_LZMA;
}
}
/* XZ compression magic */
@ -916,7 +909,7 @@ get_compression_type (int fd)
}
}
return 0;
return COMPRESSION_NONE;
}
const char *