blob: 68ca6a4205ceb36279bd75bf917530929a1574bb (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
///////////////////////////////////////////////////////////////////////////////
//
/// \file vli_reverse_decoder.c
/// \brief Decodes variable-length integers starting at end of the buffer
//
// Copyright (C) 2007 Lasse Collin
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
///////////////////////////////////////////////////////////////////////////////
#include "common.h"
extern LZMA_API lzma_ret
lzma_vli_reverse_decode(lzma_vli *vli, const uint8_t *in, size_t *in_size)
{
if (*in_size == 0)
return LZMA_BUF_ERROR;
size_t i = *in_size - 1;
*vli = in[i] & 0x7F;
if (!(in[i] & 0x80)) {
*in_size = i;
return LZMA_OK;
}
const size_t end = *in_size > LZMA_VLI_BYTES_MAX
? *in_size - LZMA_VLI_BYTES_MAX : 0;
do {
if (i-- == end) {
if (*in_size < LZMA_VLI_BYTES_MAX)
return LZMA_BUF_ERROR;
return LZMA_DATA_ERROR;
}
*vli <<= 7;
*vli = in[i] & 0x7F;
} while (!(in[i] & 0x80));
*in_size = i;
return LZMA_OK;
}
|
