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/*
* Copyright (c) 2020 iXsystems, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#include <sys/types.h>
#include <sys/kmem.h>
#include <sys/kmem_cache.h>
#include <sys/zmod.h>
#include <contrib/zlib/zlib.h>
#include <sys/kobj.h>
static void *
zcalloc(void *opaque, uint_t items, uint_t size)
{
(void) opaque;
return (malloc((size_t)items*size, M_SOLARIS, M_NOWAIT));
}
static void
zcfree(void *opaque, void *ptr)
{
(void) opaque;
free(ptr, M_SOLARIS);
}
static int
zlib_deflateInit(z_stream *stream, int level)
{
stream->zalloc = zcalloc;
stream->opaque = NULL;
stream->zfree = zcfree;
return (deflateInit(stream, level));
}
static int
zlib_deflate(z_stream *stream, int flush)
{
return (deflate(stream, flush));
}
static int
zlib_deflateEnd(z_stream *stream)
{
return (deflateEnd(stream));
}
static int
zlib_inflateInit(z_stream *stream)
{
stream->zalloc = zcalloc;
stream->opaque = NULL;
stream->zfree = zcfree;
return (inflateInit(stream));
}
static int
zlib_inflate(z_stream *stream, int finish)
{
return (inflate(stream, finish));
}
static int
zlib_inflateEnd(z_stream *stream)
{
return (inflateEnd(stream));
}
/*
* 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));
return (NULL);
}
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 = {0};
int err;
stream.next_in = (Byte *)source;
stream.avail_in = (uInt)sourceLen;
stream.next_out = dest;
stream.avail_out = (uInt)*destLen;
stream.opaque = NULL;
if ((size_t)stream.avail_out != *destLen)
return (Z_BUF_ERROR);
stream.opaque = zlib_workspace_alloc(KM_SLEEP);
#if 0
if (!stream.opaque)
return (Z_MEM_ERROR);
#endif
err = zlib_deflateInit(&stream, level);
if (err != Z_OK) {
zlib_workspace_free(stream.opaque);
return (err);
}
err = zlib_deflate(&stream, Z_FINISH);
if (err != Z_STREAM_END) {
zlib_deflateEnd(&stream);
zlib_workspace_free(stream.opaque);
return (err == Z_OK ? Z_BUF_ERROR : err);
}
*destLen = stream.total_out;
err = zlib_deflateEnd(&stream);
zlib_workspace_free(stream.opaque);
return (err);
}
/*
* 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 = {0};
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.opaque = zlib_workspace_alloc(KM_SLEEP);
#if 0
if (!stream.opaque)
return (Z_MEM_ERROR);
#endif
err = zlib_inflateInit(&stream);
if (err != Z_OK) {
zlib_workspace_free(stream.opaque);
return (err);
}
err = zlib_inflate(&stream, Z_FINISH);
if (err != Z_STREAM_END) {
zlib_inflateEnd(&stream);
zlib_workspace_free(stream.opaque);
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.opaque);
return (err);
}
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