Commit | Line | Data |
---|---|---|
889c92d2 PA |
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> | |
3ebe1243 | 11 | #include <linux/decompress/unxz.h> |
889c92d2 | 12 | #include <linux/decompress/inflate.h> |
cacb246f | 13 | #include <linux/decompress/unlzo.h> |
e76e1fdf | 14 | #include <linux/decompress/unlz4.h> |
889c92d2 PA |
15 | |
16 | #include <linux/types.h> | |
17 | #include <linux/string.h> | |
33e2a422 | 18 | #include <linux/init.h> |
889c92d2 | 19 | |
23a22d57 PA |
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 | |
3ebe1243 LC |
29 | #ifndef CONFIG_DECOMPRESS_XZ |
30 | # define unxz NULL | |
31 | #endif | |
cacb246f AT |
32 | #ifndef CONFIG_DECOMPRESS_LZO |
33 | # define unlzo NULL | |
34 | #endif | |
e76e1fdf KL |
35 | #ifndef CONFIG_DECOMPRESS_LZ4 |
36 | # define unlz4 NULL | |
37 | #endif | |
23a22d57 | 38 | |
33e2a422 | 39 | struct compress_format { |
889c92d2 PA |
40 | unsigned char magic[2]; |
41 | const char *name; | |
42 | decompress_fn decompressor; | |
33e2a422 HT |
43 | }; |
44 | ||
6f9982bd | 45 | static const struct compress_format compressed_formats[] __initconst = { |
889c92d2 PA |
46 | { {037, 0213}, "gzip", gunzip }, |
47 | { {037, 0236}, "gzip", gunzip }, | |
889c92d2 | 48 | { {0x42, 0x5a}, "bzip2", bunzip2 }, |
889c92d2 | 49 | { {0x5d, 0x00}, "lzma", unlzma }, |
3ebe1243 | 50 | { {0xfd, 0x37}, "xz", unxz }, |
cacb246f | 51 | { {0x89, 0x4c}, "lzo", unlzo }, |
e76e1fdf | 52 | { {0x02, 0x21}, "lz4", unlz4 }, |
889c92d2 PA |
53 | { {0, 0}, NULL, NULL } |
54 | }; | |
55 | ||
33e2a422 | 56 | decompress_fn __init decompress_method(const unsigned char *inbuf, int len, |
889c92d2 PA |
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 | ||
e4aa7ca5 | 64 | for (cf = compressed_formats; cf->name; cf++) { |
889c92d2 PA |
65 | if (!memcmp(inbuf, cf->magic, 2)) |
66 | break; | |
67 | ||
68 | } | |
69 | if (name) | |
70 | *name = cf->name; | |
71 | return cf->decompressor; | |
72 | } |