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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 | |
15 | #include <linux/types.h> |
16 | #include <linux/string.h> |
17 | |
18 | #ifndef CONFIG_DECOMPRESS_GZIP |
19 | # define gunzip NULL |
20 | #endif |
21 | #ifndef CONFIG_DECOMPRESS_BZIP2 |
22 | # define bunzip2 NULL |
23 | #endif |
24 | #ifndef CONFIG_DECOMPRESS_LZMA |
25 | # define unlzma NULL |
26 | #endif |
27 | #ifndef CONFIG_DECOMPRESS_XZ |
28 | # define unxz NULL |
29 | #endif |
30 | #ifndef CONFIG_DECOMPRESS_LZO |
31 | # define unlzo NULL |
32 | #endif |
33 | |
34 | static const struct compress_format { |
35 | unsigned char magic[2]; |
36 | const char *name; |
37 | decompress_fn decompressor; |
38 | } compressed_formats[] = { |
39 | { {037, 0213}, "gzip", gunzip }, |
40 | { {037, 0236}, "gzip", gunzip }, |
41 | { {0x42, 0x5a}, "bzip2", bunzip2 }, |
42 | { {0x5d, 0x00}, "lzma", unlzma }, |
43 | { {0xfd, 0x37}, "xz", unxz }, |
44 | { {0x89, 0x4c}, "lzo", unlzo }, |
45 | { {0, 0}, NULL, NULL } |
46 | }; |
47 | |
48 | decompress_fn decompress_method(const unsigned char *inbuf, int len, |
49 | const char **name) |
50 | { |
51 | const struct compress_format *cf; |
52 | |
53 | if (len < 2) |
54 | return NULL; /* Need at least this much... */ |
55 | |
56 | for (cf = compressed_formats; cf->name; cf++) { |
57 | if (!memcmp(inbuf, cf->magic, 2)) |
58 | break; |
59 | |
60 | } |
61 | if (name) |
62 | *name = cf->name; |
63 | return cf->decompressor; |
64 | } |
65 |
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v2.6.34-rc5
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