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-rw-r--r--include/linux/decompress/generic.h32
1 files changed, 19 insertions, 13 deletions
diff --git a/include/linux/decompress/generic.h b/include/linux/decompress/generic.h
index 6dfb856327bb..0c7111a55a1a 100644
--- a/include/linux/decompress/generic.h
+++ b/include/linux/decompress/generic.h
@@ -1,31 +1,37 @@
1#ifndef DECOMPRESS_GENERIC_H 1#ifndef DECOMPRESS_GENERIC_H
2#define DECOMPRESS_GENERIC_H 2#define DECOMPRESS_GENERIC_H
3 3
4/* Minimal chunksize to be read.
5 *Bzip2 prefers at least 4096
6 *Lzma prefers 0x10000 */
7#define COMPR_IOBUF_SIZE 4096
8
9typedef int (*decompress_fn) (unsigned char *inbuf, int len, 4typedef int (*decompress_fn) (unsigned char *inbuf, int len,
10 int(*fill)(void*, unsigned int), 5 int(*fill)(void*, unsigned int),
11 int(*writebb)(void*, unsigned int), 6 int(*flush)(void*, unsigned int),
12 unsigned char *output, 7 unsigned char *outbuf,
13 int *posp, 8 int *posp,
14 void(*error)(char *x)); 9 void(*error)(char *x));
15 10
16/* inbuf - input buffer 11/* inbuf - input buffer
17 *len - len of pre-read data in inbuf 12 *len - len of pre-read data in inbuf
18 *fill - function to fill inbuf if empty 13 *fill - function to fill inbuf when empty
19 *writebb - function to write out outbug 14 *flush - function to write out outbuf
15 *outbuf - output buffer
20 *posp - if non-null, input position (number of bytes read) will be 16 *posp - if non-null, input position (number of bytes read) will be
21 * returned here 17 * returned here
22 * 18 *
23 *If len != 0, the inbuf is initialized (with as much data), and fill 19 *If len != 0, inbuf should contain all the necessary input data, and fill
24 *should not be called 20 *should be NULL
25 *If len = 0, the inbuf is allocated, but empty. Its size is IOBUF_SIZE 21 *If len = 0, inbuf can be NULL, in which case the decompressor will allocate
26 *fill should be called (repeatedly...) to read data, at most IOBUF_SIZE 22 *the input buffer. If inbuf != NULL it must be at least XXX_IOBUF_SIZE bytes.
23 *fill will be called (repeatedly...) to read data, at most XXX_IOBUF_SIZE
24 *bytes should be read per call. Replace XXX with the appropriate decompressor
25 *name, i.e. LZMA_IOBUF_SIZE.
26 *
27 *If flush = NULL, outbuf must be large enough to buffer all the expected
28 *output. If flush != NULL, the output buffer will be allocated by the
29 *decompressor (outbuf = NULL), and the flush function will be called to
30 *flush the output buffer at the appropriate time (decompressor and stream
31 *dependent).
27 */ 32 */
28 33
34
29/* Utility routine to detect the decompression method */ 35/* Utility routine to detect the decompression method */
30decompress_fn decompress_method(const unsigned char *inbuf, int len, 36decompress_fn decompress_method(const unsigned char *inbuf, int len,
31 const char **name); 37 const char **name);