diff options
author | Ingo Molnar <mingo@elte.hu> | 2009-03-28 23:05:50 +0100 |
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committer | Ingo Molnar <mingo@elte.hu> | 2009-03-28 23:05:50 +0100 |
commit | b0d44c0dbbd52effb731b1c0af9afd56215c48de (patch) | |
tree | 3237c0087d91a5390aed05689b9f610ba16fa116 /lib/decompress.c | |
parent | 9537a48ed4b9e4b738943d6da0a0fd4278adf905 (diff) | |
parent | 7c730ccdc1188b97f5c8cb690906242c7ed75c22 (diff) |
Merge branch 'linus' into core/iommu
Conflicts:
arch/x86/Kconfig
Diffstat (limited to 'lib/decompress.c')
-rw-r--r-- | lib/decompress.c | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/lib/decompress.c b/lib/decompress.c new file mode 100644 index 00000000000..d2842f57167 --- /dev/null +++ b/lib/decompress.c @@ -0,0 +1,54 @@ +/* + * decompress.c + * + * Detect the decompression method based on magic number + */ + +#include <linux/decompress/generic.h> + +#include <linux/decompress/bunzip2.h> +#include <linux/decompress/unlzma.h> +#include <linux/decompress/inflate.h> + +#include <linux/types.h> +#include <linux/string.h> + +#ifndef CONFIG_DECOMPRESS_GZIP +# define gunzip NULL +#endif +#ifndef CONFIG_DECOMPRESS_BZIP2 +# define bunzip2 NULL +#endif +#ifndef CONFIG_DECOMPRESS_LZMA +# define unlzma NULL +#endif + +static const struct compress_format { + unsigned char magic[2]; + const char *name; + decompress_fn decompressor; +} compressed_formats[] = { + { {037, 0213}, "gzip", gunzip }, + { {037, 0236}, "gzip", gunzip }, + { {0x42, 0x5a}, "bzip2", bunzip2 }, + { {0x5d, 0x00}, "lzma", unlzma }, + { {0, 0}, NULL, NULL } +}; + +decompress_fn decompress_method(const unsigned char *inbuf, int len, + const char **name) +{ + const struct compress_format *cf; + + if (len < 2) + return NULL; /* Need at least this much... */ + + for (cf = compressed_formats; cf->name; cf++) { + if (!memcmp(inbuf, cf->magic, 2)) + break; + + } + if (name) + *name = cf->name; + return cf->decompressor; +} |