summaryrefslogtreecommitdiffstats
path: root/kernel/include/linux/decompress/generic.h
diff options
context:
space:
mode:
Diffstat (limited to 'kernel/include/linux/decompress/generic.h')
-rw-r--r--kernel/include/linux/decompress/generic.h39
1 files changed, 39 insertions, 0 deletions
diff --git a/kernel/include/linux/decompress/generic.h b/kernel/include/linux/decompress/generic.h
new file mode 100644
index 000000000..1fcfd64b5
--- /dev/null
+++ b/kernel/include/linux/decompress/generic.h
@@ -0,0 +1,39 @@
+#ifndef DECOMPRESS_GENERIC_H
+#define DECOMPRESS_GENERIC_H
+
+typedef int (*decompress_fn) (unsigned char *inbuf, long len,
+ long (*fill)(void*, unsigned long),
+ long (*flush)(void*, unsigned long),
+ unsigned char *outbuf,
+ long *posp,
+ void(*error)(char *x));
+
+/* inbuf - input buffer
+ *len - len of pre-read data in inbuf
+ *fill - function to fill inbuf when empty
+ *flush - function to write out outbuf
+ *outbuf - output buffer
+ *posp - if non-null, input position (number of bytes read) will be
+ * returned here
+ *
+ *If len != 0, inbuf should contain all the necessary input data, and fill
+ *should be NULL
+ *If len = 0, inbuf can be NULL, in which case the decompressor will allocate
+ *the input buffer. If inbuf != NULL it must be at least XXX_IOBUF_SIZE bytes.
+ *fill will be called (repeatedly...) to read data, at most XXX_IOBUF_SIZE
+ *bytes should be read per call. Replace XXX with the appropriate decompressor
+ *name, i.e. LZMA_IOBUF_SIZE.
+ *
+ *If flush = NULL, outbuf must be large enough to buffer all the expected
+ *output. If flush != NULL, the output buffer will be allocated by the
+ *decompressor (outbuf = NULL), and the flush function will be called to
+ *flush the output buffer at the appropriate time (decompressor and stream
+ *dependent).
+ */
+
+
+/* Utility routine to detect the decompression method */
+decompress_fn decompress_method(const unsigned char *inbuf, long len,
+ const char **name);
+
+#endif