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Add LZFX Compression support, a very fast lightweight compressor.

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Avoid a branch in the rabin loop.
This commit is contained in:
Moinak Ghosh 2012-07-23 00:15:08 +05:30
parent 7e14909ad1
commit 8cfd54fe34
7 changed files with 655 additions and 15 deletions
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23
Makefile
View file

@ -23,7 +23,7 @@
PROG= pcompress
MAINSRCS = main.c utils.c allocator.c zlib_compress.c bzip2_compress.c \
lzma_compress.c ppmd_compress.c adaptive_compress.c
lzma_compress.c ppmd_compress.c adaptive_compress.c lzfx_compress.c
MAINHDRS = allocator.h pcompress.h utils.h
MAINOBJS = $(MAINSRCS:.c=.o)
@ -40,6 +40,10 @@ LZMAHDRS = lzma/CpuArch.h lzma/LzFind.h lzma/LzmaEnc.h lzma/Types.h \
lzma/LzHash.h lzma/LzmaDec.h utils.h
LZMAOBJS = $(LZMASRCS:.c=.o)
LZFXSRCS = lzfx/lzfx.c
LZFXHDRS = lzfx/lzfx.h
LZFXOBJS = $(LZFXSRCS:.c=.o)
PPMDSRCS = lzma/Ppmd8.c lzma/Ppmd8Enc.c lzma/Ppmd8Dec.c
PPMDHDRS = lzma/Ppmd.h lzma/Ppmd8.h
PPMDOBJS = $(PPMDSRCS:.c=.o)
@ -48,11 +52,11 @@ CRCSRCS = lzma/crc64_fast.c lzma/crc64_table.c
CRCHDRS = lzma/crc64_table_le.h lzma/crc64_table_be.h lzma/crc_macros.h
CRCOBJS = $(CRCSRCS:.c=.o)
BAKFILES = *~ lzma/*~ rabin/*~ bsdiff/*~
BAKFILES = *~ lzma/*~ lzfx/*~ rabin/*~ bsdiff/*~
RM = rm -f
CPPFLAGS = -I. -I./lzma -I./rabin -I./bsdiff -D_7ZIP_ST -DNODEFAULT_PROPS -DFILE_OFFSET_BITS=64 \
-D_REENTRANT -D__USE_SSE_INTRIN__ -D_LZMA_PROB32
CPPFLAGS = -I. -I./lzma -I./lzfx -I./rabin -I./bsdiff -D_7ZIP_ST -DNODEFAULT_PROPS \
-DFILE_OFFSET_BITS=64 -D_REENTRANT -D__USE_SSE_INTRIN__ -D_LZMA_PROB32
VEC_FLAGS = -ftree-vectorize
LOOP_OPTFLAGS = $(VEC_FLAGS) -floop-interchange -floop-block
LDLIBS = -ldl -lbz2 $(ZLIB_DIR) -lz -lm
@ -92,12 +96,17 @@ $(RABINOBJS): $(RABINSRCS) $(RABINHDRS)
$(BSDIFFOBJS): $(BSDIFFSRCS) $(BSDIFFHDRS)
$(COMPILE) $(VEC_FLAGS) $(CPPFLAGS) $(@:.o=.c) -o $@
$(LZFXOBJS): $(LZFXSRCS) $(LZFXHDRS)
$(COMPILE) $(CPPFLAGS) $(@:.o=.c) -o $@
$(MAINOBJS): $(MAINSRCS) $(MAINHDRS)
$(COMPILE) $(LOOP_OPTFLAGS) $(CPPFLAGS) $(@:.o=.c) -o $@
$(PROG): $(MAINOBJS) $(LZMAOBJS) $(PPMDOBJS) $(CRCOBJS) $(RABINOBJS) $(BSDIFFOBJS)
$(LINK) -o $@ $(MAINOBJS) $(LZMAOBJS) $(PPMDOBJS) $(CRCOBJS) $(RABINOBJS) $(BSDIFFOBJS) $(LDLIBS)
$(PROG): $(MAINOBJS) $(LZMAOBJS) $(PPMDOBJS) $(LZFXOBJS) $(CRCOBJS) $(RABINOBJS) $(BSDIFFOBJS)
$(LINK) -o $@ $(MAINOBJS) $(LZMAOBJS) $(PPMDOBJS) $(CRCOBJS) \
$(LZFXOBJS) $(RABINOBJS) $(BSDIFFOBJS) $(LDLIBS)
clean:
$(RM) $(PROG) $(MAINOBJS) $(LZMAOBJS) $(PPMDOBJS) $(CRCOBJS) $(RABINOBJS) $(BSDIFFOBJS) $(BAKFILES)
$(RM) $(PROG) $(MAINOBJS) $(LZMAOBJS) $(PPMDOBJS) $(CRCOBJS) $(LZFXOBJS) \
$(RABINOBJS) $(BSDIFFOBJS) $(BAKFILES)

390
lzfx/lzfx.c Normal file
View file

@ -0,0 +1,390 @@
/*
* Copyright (c) 2009 Andrew Collette <andrew.collette at gmail.com>
* http://lzfx.googlecode.com
*
* Implements an LZF-compatible compressor/decompressor based on the liblzf
* codebase written by Marc Lehmann. This code is released under the BSD
* license. License and original copyright statement follow.
*
*
* Copyright (c) 2000-2008 Marc Alexander Lehmann <schmorp@schmorp.de>
*
* Redistribution and use in source and binary forms, with or without modifica-
* tion, 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 AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
* CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
* CIAL, 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 OTH-
* ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* This file is a part of Pcompress, a chunked parallel multi-
* algorithm lossless compression and decompression program.
*
* Copyright (C) 2012 Moinak Ghosh. All rights reserved.
* Use is subject to license terms.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This program 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
* Lesser General Public License for more details.
*
* moinakg@belenix.org, http://moinakg.wordpress.com/
*
* This is a somewhat modified bsdiff implementation. It has been modified
* to do buffer to buffer diffing instead of file to file and also use
* a custom RLE encoding rather than Bzip2 on the diff output.
*/
#include "lzfx.h"
#define LZFX_HSIZE (1 << (LZFX_HLOG))
/* We need this for memset */
#ifdef __cplusplus
# include <cstring>
#else
# include <string.h>
#endif
#if __GNUC__ >= 3 && !DISABLE_EXPECT
# define fx_expect_false(expr) __builtin_expect((expr) != 0, 0)
# define fx_expect_true(expr) __builtin_expect((expr) != 0, 1)
#else
# define fx_expect_false(expr) (expr)
# define fx_expect_true(expr) (expr)
#endif
typedef unsigned char u8;
typedef const u8 *LZSTATE[LZFX_HSIZE];
/* Define the hash function */
#define LZFX_FRST(p) (((p[0]) << 8) | p[1])
#define LZFX_NEXT(v,p) (((v) << 8) | p[2])
#define LZFX_IDX(h) ((( h >> (3*8 - LZFX_HLOG)) - h ) & (LZFX_HSIZE - 1))
/* These cannot be changed, as they are related to the compressed format. */
#define LZFX_MAX_LIT (1 << 5)
#define LZFX_MAX_OFF (1 << 13)
#define LZFX_MAX_REF ((1 << 8) + (1 << 3))
static
int lzfx_getsize(const void* ibuf, unsigned int ilen, unsigned int *olen);
/* Compressed format
There are two kinds of structures in LZF/LZFX: literal runs and back
references. The length of a literal run is encoded as L - 1, as it must
contain at least one byte. Literals are encoded as follows:
000LLLLL <L+1 bytes>
Back references are encoded as follows. The smallest possible encoded
length value is 1, as otherwise the control byte would be recognized as
a literal run. Since at least three bytes must match for a back reference
to be inserted, the length is encoded as L - 2 instead of L - 1. The
offset (distance to the desired data in the output buffer) is encoded as
o - 1, as all offsets are at least 1. The binary format is:
LLLooooo oooooooo for backrefs of real length < 9 (1 <= L < 7)
111ooooo LLLLLLLL oooooooo for backrefs of real length >= 9 (L > 7)
*/
#include <stdio.h>
int lzfx_compress(const void *const ibuf, const unsigned int ilen,
void *obuf, unsigned int *const olen){
/* Hash table; an array of u8*'s which point
to various locations in the input buffer */
const u8 *htab[LZFX_HSIZE];
const u8 **hslot; /* Pointer to entry in hash table */
unsigned int hval; /* Hash value generated by macros above */
const u8 *ref; /* Pointer to candidate match location in input */
const u8 *ip = (const u8 *)ibuf;
const u8 *const in_end = ip + ilen;
u8 *op = (u8 *)obuf;
const u8 *const out_end = (olen == NULL ? NULL : op + *olen);
int lit; /* # of bytes in current literal run */
#if defined (WIN32) && defined (_M_X64)
unsigned _int64 off; /* workaround for missing POSIX compliance */
#else
unsigned long off;
#endif
if(olen == NULL) return LZFX_EARGS;
if(ibuf == NULL){
if(ilen != 0) return LZFX_EARGS;
*olen = 0;
return 0;
}
if(obuf == NULL){
if(olen != 0) return LZFX_EARGS;
return lzfx_getsize(ibuf, ilen, olen);
}
memset(htab, 0, sizeof(htab));
/* Start a literal run. Whenever we do this the output pointer is
advanced because the current byte will hold the encoded length. */
lit = 0; op++;
hval = LZFX_FRST(ip);
while(ip + 2 < in_end){ /* The NEXT macro reads 2 bytes ahead */
hval = LZFX_NEXT(hval, ip);
hslot = htab + LZFX_IDX(hval);
ref = *hslot; *hslot = ip;
if( ref < ip
&& (off = ip - ref - 1) < LZFX_MAX_OFF
&& ip + 4 < in_end /* Backref takes up to 3 bytes, so don't bother */
&& ref > (u8 *)ibuf
&& ref[0] == ip[0]
&& ref[1] == ip[1]
&& ref[2] == ip[2] ) {
unsigned int len = 3; /* We already know 3 bytes match */
const unsigned int maxlen = in_end - ip - 2 > LZFX_MAX_REF ?
LZFX_MAX_REF : in_end - ip - 2;
/* lit == 0: op + 3 must be < out_end (because we undo the run)
lit != 0: op + 3 + 1 must be < out_end */
if(fx_expect_false(op - !lit + 3 + 1 >= out_end))
return LZFX_ESIZE;
op [- lit - 1] = lit - 1; /* Terminate literal run */
op -= !lit; /* Undo run if length is zero */
/* Start checking at the fourth byte */
while (len < maxlen && ref[len] == ip[len])
len++;
len -= 2; /* We encode the length as #octets - 2 */
/* Format 1: [LLLooooo oooooooo] */
if (len < 7) {
*op++ = (off >> 8) + (len << 5);
*op++ = off;
/* Format 2: [111ooooo LLLLLLLL oooooooo] */
} else {
*op++ = (off >> 8) + (7 << 5);
*op++ = len - 7;
*op++ = off;
}
lit = 0; op++;
ip += len + 1; /* ip = initial ip + #octets -1 */
if (fx_expect_false (ip + 3 >= in_end)){
ip++; /* Code following expects exit at bottom of loop */
break;
}
hval = LZFX_FRST (ip);
hval = LZFX_NEXT (hval, ip);
htab[LZFX_IDX (hval)] = ip;
ip++; /* ip = initial ip + #octets */
} else {
/* Keep copying literal bytes */
if (fx_expect_false (op >= out_end)) return LZFX_ESIZE;
lit++; *op++ = *ip++;
if (fx_expect_false (lit == LZFX_MAX_LIT)) {
op [- lit - 1] = lit - 1; /* stop run */
lit = 0; op++; /* start run */
}
} /* if() found match in htab */
} /* while(ip < ilen -2) */
/* At most 3 bytes remain in input. We therefore need 4 bytes available
in the output buffer to store them (3 data + ctrl byte).*/
if (op + 3 > out_end) return LZFX_ESIZE;
while (ip < in_end) {
lit++; *op++ = *ip++;
if (fx_expect_false (lit == LZFX_MAX_LIT)){
op [- lit - 1] = lit - 1;
lit = 0; op++;
}
}
op [- lit - 1] = lit - 1;
op -= !lit;
*olen = op - (u8 *)obuf;
return 0;
}
/* Decompressor */
int lzfx_decompress(const void* ibuf, unsigned int ilen,
void* obuf, unsigned int *olen){
u8 const *ip = (const u8 *)ibuf;
u8 const *const in_end = ip + ilen;
u8 *op = (u8 *)obuf;
u8 const *const out_end = (olen == NULL ? NULL : op + *olen);
unsigned int remain_len = 0;
int rc;
if(olen == NULL) return LZFX_EARGS;
if(ibuf == NULL){
if(ilen != 0) return LZFX_EARGS;
*olen = 0;
return 0;
}
if(obuf == NULL){
if(olen != 0) return LZFX_EARGS;
return lzfx_getsize(ibuf, ilen, olen);
}
do {
unsigned int ctrl = *ip++;
/* Format 000LLLLL: a literal byte string follows, of length L+1 */
if(ctrl < (1 << 5)) {
ctrl++;
if(fx_expect_false(op + ctrl > out_end)){
--ip; /* Rewind to control byte */
goto guess;
}
if(fx_expect_false(ip + ctrl > in_end)) return LZFX_ECORRUPT;
do
*op++ = *ip++;
while(--ctrl);
/* Format #1 [LLLooooo oooooooo]: backref of length L+1+2
^^^^^ ^^^^^^^^
A B
#2 [111ooooo LLLLLLLL oooooooo] backref of length L+7+2
^^^^^ ^^^^^^^^
A B
In both cases the location of the backref is computed from the
remaining part of the data as follows:
location = op - A*256 - B - 1
*/
} else {
unsigned int len = (ctrl >> 5);
u8 *ref = op - ((ctrl & 0x1f) << 8) -1;
if(len==7) len += *ip++; /* i.e. format #2 */
len += 2; /* len is now #octets */
if(fx_expect_false(op + len > out_end)){
ip -= (len >= 9) ? 2 : 1; /* Rewind to control byte */
goto guess;
}
if(fx_expect_false(ip >= in_end)) return LZFX_ECORRUPT;
ref -= *ip++;
if(fx_expect_false(ref < (u8*)obuf)) return LZFX_ECORRUPT;
do
*op++ = *ref++;
while (--len);
}
} while (ip < in_end);
*olen = op - (u8 *)obuf;
return 0;
guess:
rc = lzfx_getsize(ip, ilen - (ip-(u8*)ibuf), &remain_len);
if(rc>=0) *olen = remain_len + (op - (u8*)obuf);
return rc;
}
/* Guess len. No parameters may be NULL; this is not checked. */
static
int lzfx_getsize(const void* ibuf, unsigned int ilen, unsigned int *olen){
u8 const *ip = (const u8 *)ibuf;
u8 const *const in_end = ip + ilen;
int tot_len = 0;
while (ip < in_end) {
unsigned int ctrl = *ip++;
if(ctrl < (1 << 5)) {
ctrl++;
if(ip + ctrl > in_end)
return LZFX_ECORRUPT;
tot_len += ctrl;
ip += ctrl;
} else {
unsigned int len = (ctrl >> 5);
if(len==7){ /* i.e. format #2 */
len += *ip++;
}
len += 2; /* len is now #octets */
if(ip >= in_end) return LZFX_ECORRUPT;
ip++; /* skip the ref byte */
tot_len += len;
}
}
*olen = tot_len;
return 0;
}

122
lzfx/lzfx.h Normal file
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@ -0,0 +1,122 @@
/*
* Copyright (c) 2009 Andrew Collette <andrew.collette at gmail.com>
* http://lzfx.googlecode.com
*
* Implements an LZF-compatible compressor/decompressor based on the liblzf
* codebase written by Marc Lehmann. This code is released under the BSD
* license. License and original copyright statement follow.
*
*
* Copyright (c) 2000-2008 Marc Alexander Lehmann <schmorp@schmorp.de>
*
* Redistribution and use in source and binary forms, with or without modifica-
* tion, 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 AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
* CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
* CIAL, 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 OTH-
* ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* This file is a part of Pcompress, a chunked parallel multi-
* algorithm lossless compression and decompression program.
*
* Copyright (C) 2012 Moinak Ghosh. All rights reserved.
* Use is subject to license terms.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This program 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
* Lesser General Public License for more details.
*
* moinakg@belenix.org, http://moinakg.wordpress.com/
*
* This is a somewhat modified bsdiff implementation. It has been modified
* to do buffer to buffer diffing instead of file to file and also use
* a custom RLE encoding rather than Bzip2 on the diff output.
*/
#ifndef LZFX_H
#define LZFX_H
#ifdef __cplusplus
extern "C" {
#endif
/* Documented behavior, including function signatures and error codes,
is guaranteed to remain unchanged for releases with the same major
version number. Releases of the same major version are also able
to read each other's output, although the output itself is not
guaranteed to be byte-for-byte identical.
*/
#define LZFX_VERSION_MAJOR 0
#define LZFX_VERSION_MINOR 1
#define LZFX_VERSION_STRING "0.1"
/* Hashtable size (2**LZFX_HLOG entries) */
#ifndef LZFX_HLOG
# define LZFX_HLOG 16
#endif
/* Predefined errors. */
#define LZFX_ESIZE -1 /* Output buffer too small */
#define LZFX_ECORRUPT -2 /* Invalid data for decompression */
#define LZFX_EARGS -3 /* Arguments invalid (NULL) */
/* Buffer-to buffer compression.
Supply pre-allocated input and output buffers via ibuf and obuf, and
their size in bytes via ilen and olen. Buffers may not overlap.
On success, the function returns a non-negative value and the argument
olen contains the compressed size in bytes. On failure, a negative
value is returned and olen is not modified.
*/
int lzfx_compress(const void* ibuf, unsigned int ilen,
void* obuf, unsigned int *olen);
/* Buffer-to-buffer decompression.
Supply pre-allocated input and output buffers via ibuf and obuf, and
their size in bytes via ilen and olen. Buffers may not overlap.
On success, the function returns a non-negative value and the argument
olen contains the uncompressed size in bytes. On failure, a negative
value is returned.
If the failure code is LZFX_ESIZE, olen contains the minimum buffer size
required to hold the decompressed data. Otherwise, olen is not modified.
Supplying a zero *olen is a valid and supported strategy to determine the
required buffer size. This does not require decompression of the entire
stream and is consequently very fast. Argument obuf may be NULL in
this case only.
*/
int lzfx_decompress(const void* ibuf, unsigned int ilen,
void* obuf, unsigned int *olen);
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif

99
lzfx_compress.c Normal file
View file

@ -0,0 +1,99 @@
/*
* This file is a part of Pcompress, a chunked parallel multi-
* algorithm lossless compression and decompression program.
*
* Copyright (C) 2012 Moinak Ghosh. All rights reserved.
* Use is subject to license terms.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This program 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
* Lesser General Public License for more details.
*
* moinakg@belenix.org, http://moinakg.wordpress.com/
*
* This program includes partly-modified public domain source
* code from the LZMA SDK: http://www.7-zip.org/sdk.html
*/
#include <sys/types.h>
#include <stdio.h>
#include <strings.h>
#include <limits.h>
#include <utils.h>
#include <pcompress.h>
#include <lzfx.h>
void
lz_fx_stats(int show)
{
}
int
lz_fx_init(void **data, int *level, ssize_t chunksize)
{
if (*level > 9) *level = 9;
if (chunksize > UINT_MAX) {
fprintf(stderr, "Chunk size too big for LZFX.\n");
return (1);
}
return (0);
}
void
lz_fx_err(int err)
{
switch (err) {
case LZFX_ESIZE:
fprintf(stderr, "LZFX: Output buffer too small.\n");
break;
case LZFX_ECORRUPT:
fprintf(stderr, "LZFX: Corrupt data for decompression.\n");
break;
case LZFX_EARGS:
fprintf(stderr, "LZFX: Invalid arguments.\n");
break;
default:
fprintf(stderr, "LZFX: Unknown error code: %d\n", err);
}
}
int
lz_fx_compress(void *src, size_t srclen, void *dst, size_t *dstlen,
int level, uchar_t chdr, void *data)
{
int rv;
unsigned int _srclen = srclen;
unsigned int _dstlen = *dstlen;
rv = lzfx_compress(src, _srclen, dst, &_dstlen);
if (rv == -1) {
lz_fx_err(rv);
return (-1);
}
*dstlen = _dstlen;
return (0);
}
int
lz_fx_decompress(void *src, size_t srclen, void *dst, size_t *dstlen,
int level, uchar_t chdr, void *data)
{
int rv;
unsigned int _srclen = srclen;
unsigned int _dstlen = *dstlen;
rv = lzfx_decompress(src, _srclen, dst, &_dstlen);
if (rv == -1) {
lz_fx_err(rv);
return (-1);
}
*dstlen = _dstlen;
return (0);
}

8
main.c
View file

@ -1185,6 +1185,14 @@ init_algo(const char *algo, int bail)
_stats_func = ppmd_stats;
rv = 0;
} else if (memcmp(algorithm, "lzfx", 4) == 0) {
_compress_func = lz_fx_compress;
_decompress_func = lz_fx_decompress;
_init_func = lz_fx_init;
_deinit_func = NULL;
_stats_func = lz_fx_stats;
rv = 0;
/* adapt2 and adapt ordering of the checks matter here. */
} else if (memcmp(algorithm, "adapt2", 6) == 0) {
_compress_func = adapt_compress;

6
pcompress.h
View file

@ -65,6 +65,8 @@ extern int adapt_compress(void *src, size_t srclen, void *dst,
size_t *dstlen, int level, uchar_t chdr, void *data);
extern int ppmd_compress(void *src, size_t srclen, void *dst,
size_t *dstlen, int level, uchar_t chdr, void *data);
extern int lz_fx_compress(void *src, size_t srclen, void *dst,
size_t *dstlen, int level, uchar_t chdr, void *data);
extern int zlib_decompress(void *src, size_t srclen, void *dst,
size_t *dstlen, int level, uchar_t chdr, void *data);
@ -76,6 +78,8 @@ extern int adapt_decompress(void *src, size_t srclen, void *dst,
size_t *dstlen, int level, uchar_t chdr, void *data);
extern int ppmd_decompress(void *src, size_t srclen, void *dst,
size_t *dstlen, int level, uchar_t chdr, void *data);
extern int lz_fx_decompress(void *src, size_t srclen, void *dst,
size_t *dstlen, int level, uchar_t chdr, void *data);
extern int adapt_init(void **data, int *level, ssize_t chunksize);
extern int adapt2_init(void **data, int *level, ssize_t chunksize);
@ -83,6 +87,7 @@ extern int lzma_init(void **data, int *level, ssize_t chunksize);
extern int ppmd_init(void **data, int *level, ssize_t chunksize);
extern int bzip2_init(void **data, int *level, ssize_t chunksize);
extern int zlib_init(void **data, int *level, ssize_t chunksize);
extern int lz_fx_init(void **data, int *level, ssize_t chunksize);
extern int adapt_deinit(void **data);
extern int lzma_deinit(void **data);
@ -93,6 +98,7 @@ extern void ppmd_stats(int show);
extern void lzma_stats(int show);
extern void bzip2_stats(int show);
extern void zlib_stats(int show);
extern void lz_fx_stats(int show);
/*
* Per-thread data structure for compression and decompression threads.

22
rabin/rabin_polynomial.c
View file

@ -235,7 +235,7 @@ rabin_dedup(rabin_context_t *ctx, uchar_t *buf, ssize_t *size, ssize_t offset, s
uint32_t length;
uint64_t cur_roll_checksum, cur_sketch;
uint64_t *fplist;
uint32_t len1, fpos;
uint32_t len1, fpos[2];
if (rabin_pos == NULL) {
/*
@ -245,7 +245,8 @@ rabin_dedup(rabin_context_t *ctx, uchar_t *buf, ssize_t *size, ssize_t offset, s
fplist_sz = 8 * ctx->rabin_poly_avg_block_size;
fplist = (uint64_t *)(ctx->cbuf + ctx->real_chunksize - fplist_sz);
memset(fplist, 0, fplist_sz);
fpos = 0;
fpos[0] = 0;
fpos[1] = 0;
len1 = 0;
}
length = offset;
@ -321,17 +322,22 @@ rabin_dedup(rabin_context_t *ctx, uchar_t *buf, ssize_t *size, ssize_t offset, s
* http://www.armedia.com/wp/SimilarityIndex.pdf
*/
len1++;
j = cur_roll_checksum & ctx->rabin_avg_block_mask;
fplist[j] += cur_roll_checksum;
if (fplist[j] > fplist[fpos]) fpos = j;
fpos[1] = cur_roll_checksum & ctx->rabin_avg_block_mask;
fplist[fpos[1]] += cur_roll_checksum;
/*
* Perform the following statement without branching:
* if (fplist[fpos[1]] > fplist[fpos[0]]) fpos[0] = fpos[1];
*/
fpos[0] = fpos[(fplist[fpos[1]] > fplist[fpos[0]])];
if (len1 == SKETCH_BASIC_BLOCK_SZ) {
/*
* Compute the super sketch value by summing all the representative
* fingerprints of the block.
*/
cur_sketch += fplist[fpos];
cur_sketch += fplist[fpos[0]];
memset(fplist, 0, fplist_sz);
fpos = 0;
fpos[0] = 0;
len1 = 0;
}
/*
@ -354,7 +360,7 @@ rabin_dedup(rabin_context_t *ctx, uchar_t *buf, ssize_t *size, ssize_t offset, s
ctx->blocks[blknum].similar = 0;
ctx->blocks[blknum].cksum_n_offset = cur_sketch;
memset(fplist, 0, fplist_sz);
fpos = 0;
fpos[0] = 0;
len1 = 0;
cur_sketch = 0;
blknum++;