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-rw-r--r--lib/decompress.c54
1 files changed, 54 insertions, 0 deletions
diff --git a/lib/decompress.c b/lib/decompress.c
new file mode 100644
index 000000000000..d2842f571674
--- /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;
+}