217 lines
6.9 KiB
C
217 lines
6.9 KiB
C
/*
|
|
* Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
|
|
* Copyright (C) 2007 The Regents of the University of California.
|
|
* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
|
|
* Written by Brian Behlendorf <behlendorf1@llnl.gov>.
|
|
* UCRL-CODE-235197
|
|
*
|
|
* This file is part of the SPL, Solaris Porting Layer.
|
|
* For details, see <http://zfsonlinux.org/>.
|
|
*
|
|
* The SPL is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the
|
|
* Free Software Foundation; either version 2 of the License, or (at your
|
|
* option) any later version.
|
|
*
|
|
* The SPL is distributed in the hope that it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
* for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with the SPL. If not, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
*
|
|
* z_compress_level/z_uncompress are nearly identical copies of the
|
|
* compress2/uncompress functions provided by the official zlib package
|
|
* available at http://zlib.net/. The only changes made we to slightly
|
|
* adapt the functions called to match the linux kernel implementation
|
|
* of zlib. The full zlib license follows:
|
|
*
|
|
* zlib.h -- interface of the 'zlib' general purpose compression library
|
|
* version 1.2.5, April 19th, 2010
|
|
*
|
|
* Copyright (C) 1995-2010 Jean-loup Gailly and Mark Adler
|
|
*
|
|
* This software is provided 'as-is', without any express or implied
|
|
* warranty. In no event will the authors be held liable for any damages
|
|
* arising from the use of this software.
|
|
*
|
|
* Permission is granted to anyone to use this software for any purpose,
|
|
* including commercial applications, and to alter it and redistribute it
|
|
* freely, subject to the following restrictions:
|
|
*
|
|
* 1. The origin of this software must not be misrepresented; you must not
|
|
* claim that you wrote the original software. If you use this software
|
|
* in a product, an acknowledgment in the product documentation would be
|
|
* appreciated but is not required.
|
|
* 2. Altered source versions must be plainly marked as such, and must not be
|
|
* misrepresented as being the original software.
|
|
* 3. This notice may not be removed or altered from any source distribution.
|
|
*
|
|
* Jean-loup Gailly
|
|
* Mark Adler
|
|
*/
|
|
|
|
|
|
#include <sys/kmem.h>
|
|
#include <sys/kmem_cache.h>
|
|
#include <sys/zmod.h>
|
|
|
|
static spl_kmem_cache_t *zlib_workspace_cache;
|
|
|
|
/*
|
|
* A kmem_cache is used for the zlib workspaces to avoid having to vmalloc
|
|
* and vfree for every call. Using a kmem_cache also has the advantage
|
|
* that improves the odds that the memory used will be local to this cpu.
|
|
* To further improve things it might be wise to create a dedicated per-cpu
|
|
* workspace for use. This would take some additional care because we then
|
|
* must disable preemption around the critical section, and verify that
|
|
* zlib_deflate* and zlib_inflate* never internally call schedule().
|
|
*/
|
|
static void *
|
|
zlib_workspace_alloc(int flags)
|
|
{
|
|
return (kmem_cache_alloc(zlib_workspace_cache, flags & ~(__GFP_FS)));
|
|
}
|
|
|
|
static void
|
|
zlib_workspace_free(void *workspace)
|
|
{
|
|
kmem_cache_free(zlib_workspace_cache, workspace);
|
|
}
|
|
|
|
/*
|
|
* Compresses the source buffer into the destination buffer. The level
|
|
* parameter has the same meaning as in deflateInit. sourceLen is the byte
|
|
* length of the source buffer. Upon entry, destLen is the total size of the
|
|
* destination buffer, which must be at least 0.1% larger than sourceLen plus
|
|
* 12 bytes. Upon exit, destLen is the actual size of the compressed buffer.
|
|
*
|
|
* compress2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
|
|
* memory, Z_BUF_ERROR if there was not enough room in the output buffer,
|
|
* Z_STREAM_ERROR if the level parameter is invalid.
|
|
*/
|
|
int
|
|
z_compress_level(void *dest, size_t *destLen, const void *source,
|
|
size_t sourceLen, int level)
|
|
{
|
|
z_stream stream;
|
|
int err;
|
|
|
|
stream.next_in = (Byte *)source;
|
|
stream.avail_in = (uInt)sourceLen;
|
|
stream.next_out = dest;
|
|
stream.avail_out = (uInt)*destLen;
|
|
|
|
if ((size_t)stream.avail_out != *destLen)
|
|
return (Z_BUF_ERROR);
|
|
|
|
stream.workspace = zlib_workspace_alloc(KM_SLEEP);
|
|
if (!stream.workspace)
|
|
return (Z_MEM_ERROR);
|
|
|
|
err = zlib_deflateInit(&stream, level);
|
|
if (err != Z_OK) {
|
|
zlib_workspace_free(stream.workspace);
|
|
return (err);
|
|
}
|
|
|
|
err = zlib_deflate(&stream, Z_FINISH);
|
|
if (err != Z_STREAM_END) {
|
|
zlib_deflateEnd(&stream);
|
|
zlib_workspace_free(stream.workspace);
|
|
return (err == Z_OK ? Z_BUF_ERROR : err);
|
|
}
|
|
*destLen = stream.total_out;
|
|
|
|
err = zlib_deflateEnd(&stream);
|
|
zlib_workspace_free(stream.workspace);
|
|
|
|
return (err);
|
|
}
|
|
EXPORT_SYMBOL(z_compress_level);
|
|
|
|
/*
|
|
* Decompresses the source buffer into the destination buffer. sourceLen is
|
|
* the byte length of the source buffer. Upon entry, destLen is the total
|
|
* size of the destination buffer, which must be large enough to hold the
|
|
* entire uncompressed data. (The size of the uncompressed data must have
|
|
* been saved previously by the compressor and transmitted to the decompressor
|
|
* by some mechanism outside the scope of this compression library.)
|
|
* Upon exit, destLen is the actual size of the compressed buffer.
|
|
* This function can be used to decompress a whole file at once if the
|
|
* input file is mmap'ed.
|
|
*
|
|
* uncompress returns Z_OK if success, Z_MEM_ERROR if there was not
|
|
* enough memory, Z_BUF_ERROR if there was not enough room in the output
|
|
* buffer, or Z_DATA_ERROR if the input data was corrupted.
|
|
*/
|
|
int
|
|
z_uncompress(void *dest, size_t *destLen, const void *source, size_t sourceLen)
|
|
{
|
|
z_stream stream;
|
|
int err;
|
|
|
|
stream.next_in = (Byte *)source;
|
|
stream.avail_in = (uInt)sourceLen;
|
|
stream.next_out = dest;
|
|
stream.avail_out = (uInt)*destLen;
|
|
|
|
if ((size_t)stream.avail_out != *destLen)
|
|
return (Z_BUF_ERROR);
|
|
|
|
stream.workspace = zlib_workspace_alloc(KM_SLEEP);
|
|
if (!stream.workspace)
|
|
return (Z_MEM_ERROR);
|
|
|
|
err = zlib_inflateInit(&stream);
|
|
if (err != Z_OK) {
|
|
zlib_workspace_free(stream.workspace);
|
|
return (err);
|
|
}
|
|
|
|
err = zlib_inflate(&stream, Z_FINISH);
|
|
if (err != Z_STREAM_END) {
|
|
zlib_inflateEnd(&stream);
|
|
zlib_workspace_free(stream.workspace);
|
|
|
|
if (err == Z_NEED_DICT ||
|
|
(err == Z_BUF_ERROR && stream.avail_in == 0))
|
|
return (Z_DATA_ERROR);
|
|
|
|
return (err);
|
|
}
|
|
*destLen = stream.total_out;
|
|
|
|
err = zlib_inflateEnd(&stream);
|
|
zlib_workspace_free(stream.workspace);
|
|
|
|
return (err);
|
|
}
|
|
EXPORT_SYMBOL(z_uncompress);
|
|
|
|
int
|
|
spl_zlib_init(void)
|
|
{
|
|
int size;
|
|
|
|
size = MAX(spl_zlib_deflate_workspacesize(MAX_WBITS, MAX_MEM_LEVEL),
|
|
zlib_inflate_workspacesize());
|
|
|
|
zlib_workspace_cache = kmem_cache_create(
|
|
"spl_zlib_workspace_cache",
|
|
size, 0, NULL, NULL, NULL, NULL, NULL,
|
|
KMC_VMEM | KMC_NOEMERGENCY);
|
|
if (!zlib_workspace_cache)
|
|
return (1);
|
|
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
spl_zlib_fini(void)
|
|
{
|
|
kmem_cache_destroy(zlib_workspace_cache);
|
|
zlib_workspace_cache = NULL;
|
|
}
|