Root/
1 | /* |
2 | * decompress.c |
3 | * |
4 | * Detect the decompression method based on magic number |
5 | */ |
6 | |
7 | #include <linux/decompress/generic.h> |
8 | |
9 | #include <linux/decompress/bunzip2.h> |
10 | #include <linux/decompress/unlzma.h> |
11 | #include <linux/decompress/unxz.h> |
12 | #include <linux/decompress/inflate.h> |
13 | #include <linux/decompress/unlzo.h> |
14 | #include <linux/decompress/unlz4.h> |
15 | |
16 | #include <linux/types.h> |
17 | #include <linux/string.h> |
18 | #include <linux/init.h> |
19 | |
20 | #ifndef CONFIG_DECOMPRESS_GZIP |
21 | # define gunzip NULL |
22 | #endif |
23 | #ifndef CONFIG_DECOMPRESS_BZIP2 |
24 | # define bunzip2 NULL |
25 | #endif |
26 | #ifndef CONFIG_DECOMPRESS_LZMA |
27 | # define unlzma NULL |
28 | #endif |
29 | #ifndef CONFIG_DECOMPRESS_XZ |
30 | # define unxz NULL |
31 | #endif |
32 | #ifndef CONFIG_DECOMPRESS_LZO |
33 | # define unlzo NULL |
34 | #endif |
35 | #ifndef CONFIG_DECOMPRESS_LZ4 |
36 | # define unlz4 NULL |
37 | #endif |
38 | |
39 | struct compress_format { |
40 | unsigned char magic[2]; |
41 | const char *name; |
42 | decompress_fn decompressor; |
43 | }; |
44 | |
45 | static const struct compress_format compressed_formats[] __initconst = { |
46 | { {037, 0213}, "gzip", gunzip }, |
47 | { {037, 0236}, "gzip", gunzip }, |
48 | { {0x42, 0x5a}, "bzip2", bunzip2 }, |
49 | { {0x5d, 0x00}, "lzma", unlzma }, |
50 | { {0xfd, 0x37}, "xz", unxz }, |
51 | { {0x89, 0x4c}, "lzo", unlzo }, |
52 | { {0x02, 0x21}, "lz4", unlz4 }, |
53 | { {0, 0}, NULL, NULL } |
54 | }; |
55 | |
56 | decompress_fn __init decompress_method(const unsigned char *inbuf, int len, |
57 | const char **name) |
58 | { |
59 | const struct compress_format *cf; |
60 | |
61 | if (len < 2) |
62 | return NULL; /* Need at least this much... */ |
63 | |
64 | for (cf = compressed_formats; cf->name; cf++) { |
65 | if (!memcmp(inbuf, cf->magic, 2)) |
66 | break; |
67 | |
68 | } |
69 | if (name) |
70 | *name = cf->name; |
71 | return cf->decompressor; |
72 | } |
73 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9