VisionFive2 Linux kernel

b24413180f560 (Greg Kroah-Hartman 2017-11-01 15:07:57 +0100  1) // SPDX-License-Identifier: GPL-2.0
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  2) /*
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  3)  * uncompress.c
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  4)  *
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  5)  * (C) Copyright 1999 Linus Torvalds
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  6)  *
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  7)  * cramfs interfaces to the uncompression library. There's really just
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  8)  * three entrypoints:
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700  9)  *
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 10)  *  - cramfs_uncompress_init() - called to initialize the thing.
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 11)  *  - cramfs_uncompress_exit() - tell me when you're done
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 12)  *  - cramfs_uncompress_block() - uncompress a block.
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 13)  *
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 14)  * NOTE NOTE NOTE! The uncompression is entirely single-threaded. We
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 15)  * only have one stream, and we'll initialize it only once even if it
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 16)  * then is used by multiple filesystems.
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 17)  */
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 18) 
4f21e1ea09e1e (Fabian Frederick   2014-08-08 14:22:50 -0700 19) #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
4f21e1ea09e1e (Fabian Frederick   2014-08-08 14:22:50 -0700 20) 
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 21) #include <linux/kernel.h>
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 22) #include <linux/errno.h>
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 23) #include <linux/vmalloc.h>
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 24) #include <linux/zlib.h>
f7f4f4dd6948e (Al Viro            2013-12-10 16:54:28 -0500 25) #include "internal.h"
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 26) 
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 27) static z_stream stream;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 28) static int initialized;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 29) 
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 30) /* Returns length of decompressed data. */
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 31) int cramfs_uncompress_block(void *dst, int dstlen, void *src, int srclen)
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 32) {
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 33) 	int err;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 34) 
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 35) 	stream.next_in = src;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 36) 	stream.avail_in = srclen;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 37) 
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 38) 	stream.next_out = dst;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 39) 	stream.avail_out = dstlen;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 40) 
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 41) 	err = zlib_inflateReset(&stream);
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 42) 	if (err != Z_OK) {
f175ff8100eef (Fabian Frederick   2014-08-08 14:22:48 -0700 43) 		pr_err("zlib_inflateReset error %d\n", err);
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 44) 		zlib_inflateEnd(&stream);
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 45) 		zlib_inflateInit(&stream);
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 46) 	}
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 47) 
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 48) 	err = zlib_inflate(&stream, Z_FINISH);
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 49) 	if (err != Z_STREAM_END)
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 50) 		goto err;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 51) 	return stream.total_out;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 52) 
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 53) err:
f175ff8100eef (Fabian Frederick   2014-08-08 14:22:48 -0700 54) 	pr_err("Error %d while decompressing!\n", err);
f175ff8100eef (Fabian Frederick   2014-08-08 14:22:48 -0700 55) 	pr_err("%p(%d)->%p(%d)\n", src, srclen, dst, dstlen);
98310e581e098 (David VomLehn      2009-04-02 16:59:15 -0700 56) 	return -EIO;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 57) }
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 58) 
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 59) int cramfs_uncompress_init(void)
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 60) {
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 61) 	if (!initialized++) {
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 62) 		stream.workspace = vmalloc(zlib_inflate_workspacesize());
31d92e55198d4 (Fabian Frederick   2014-08-08 14:22:52 -0700 63) 		if (!stream.workspace) {
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 64) 			initialized = 0;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 65) 			return -ENOMEM;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 66) 		}
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 67) 		stream.next_in = NULL;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 68) 		stream.avail_in = 0;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 69) 		zlib_inflateInit(&stream);
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 70) 	}
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 71) 	return 0;
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 72) }
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 73) 
368bdb3d616fa (Alexey Dobriyan    2006-09-29 02:01:05 -0700 74) void cramfs_uncompress_exit(void)
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 75) {
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 76) 	if (!--initialized) {
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 77) 		zlib_inflateEnd(&stream);
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 78) 		vfree(stream.workspace);
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 79) 	}
^1da177e4c3f4 (Linus Torvalds     2005-04-16 15:20:36 -0700 80) }