r354253 did miss lz4.c from sys/cddl/boot/zfs.
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=354254
@ -1,329 +0,0 @@
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/*
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* LZ4 - Fast LZ compression algorithm
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* Header File
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* Copyright (C) 2011-2013, Yann Collet.
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* BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* You can contact the author at :
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* - LZ4 homepage : http://fastcompression.blogspot.com/p/lz4.html
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* - LZ4 source repository : http://code.google.com/p/lz4/
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*
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* $FreeBSD$
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*/
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#include <netinet/in.h>
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static int LZ4_uncompress_unknownOutputSize(const char *source, char *dest,
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int isize, int maxOutputSize);
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/* ARGSUSED */
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static int
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lz4_decompress(void *s_start, void *d_start, size_t s_len, size_t d_len, int dummy __unused)
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{
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const uint8_t *src = s_start;
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uint32_t bufsiz = htonl(*(uint32_t *)src);
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/* invalid compressed buffer size encoded at start */
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if (bufsiz + 4 > s_len)
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return (1);
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/*
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* Returns 0 on success (decompression function returned non-negative)
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* and non-zero on failure (decompression function returned negative).
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*/
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return (LZ4_uncompress_unknownOutputSize((const char *)s_start + 4, d_start, bufsiz,
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d_len) < 0);
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}
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/*
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* CPU Feature Detection
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*/
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/* 32 or 64 bits ? */
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#if (defined(__x86_64__) || defined(__x86_64) || defined(__amd64__) || \
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defined(__amd64) || defined(__ppc64__) || defined(_WIN64) || \
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defined(__LP64__) || defined(_LP64))
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#define LZ4_ARCH64 1
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#else
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#define LZ4_ARCH64 0
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#endif
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/*
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* Little Endian or Big Endian?
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* Note: overwrite the below #define if you know your architecture endianess.
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*/
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#if BYTE_ORDER == BIG_ENDIAN
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#define LZ4_BIG_ENDIAN 1
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#else
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/*
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* Little Endian assumed. PDP Endian and other very rare endian format
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* are unsupported.
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*/
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#endif
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/*
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* Unaligned memory access is automatically enabled for "common" CPU,
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* such as x86. For others CPU, the compiler will be more cautious, and
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* insert extra code to ensure aligned access is respected. If you know
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* your target CPU supports unaligned memory access, you may want to
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* force this option manually to improve performance
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*/
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#if defined(__ARM_FEATURE_UNALIGNED)
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#define LZ4_FORCE_UNALIGNED_ACCESS 1
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#endif
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/*
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* Compiler Options
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*/
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#if __STDC_VERSION__ >= 199901L /* C99 */
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/* "restrict" is a known keyword */
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#else
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/* Disable restrict */
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#define restrict
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#endif
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#define GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__)
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#define lz4_bswap16(x) ((unsigned short int) ((((x) >> 8) & 0xffu) \
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| (((x) & 0xffu) << 8)))
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#if (GCC_VERSION >= 302) || (__INTEL_COMPILER >= 800) || defined(__clang__)
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#define expect(expr, value) (__builtin_expect((expr), (value)))
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#else
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#define expect(expr, value) (expr)
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#endif
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#define likely(expr) expect((expr) != 0, 1)
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#define unlikely(expr) expect((expr) != 0, 0)
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/* Basic types */
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#define BYTE uint8_t
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#define U16 uint16_t
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#define U32 uint32_t
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#define S32 int32_t
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#define U64 uint64_t
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#ifndef LZ4_FORCE_UNALIGNED_ACCESS
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#pragma pack(1)
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#endif
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typedef struct _U16_S {
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U16 v;
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} U16_S;
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typedef struct _U32_S {
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U32 v;
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} U32_S;
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typedef struct _U64_S {
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U64 v;
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} U64_S;
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#ifndef LZ4_FORCE_UNALIGNED_ACCESS
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#pragma pack()
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#endif
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#define A64(x) (((U64_S *)(x))->v)
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#define A32(x) (((U32_S *)(x))->v)
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#define A16(x) (((U16_S *)(x))->v)
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/*
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* Constants
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*/
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#define MINMATCH 4
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#define COPYLENGTH 8
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#define LASTLITERALS 5
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#define ML_BITS 4
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#define ML_MASK ((1U<<ML_BITS)-1)
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#define RUN_BITS (8-ML_BITS)
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#define RUN_MASK ((1U<<RUN_BITS)-1)
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/*
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* Architecture-specific macros
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*/
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#if LZ4_ARCH64
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#define STEPSIZE 8
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#define UARCH U64
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#define AARCH A64
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#define LZ4_COPYSTEP(s, d) A64(d) = A64(s); d += 8; s += 8;
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#define LZ4_COPYPACKET(s, d) LZ4_COPYSTEP(s, d)
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#define LZ4_SECURECOPY(s, d, e) if (d < e) LZ4_WILDCOPY(s, d, e)
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#define HTYPE U32
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#define INITBASE(base) const BYTE* const base = ip
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#else
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#define STEPSIZE 4
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#define UARCH U32
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#define AARCH A32
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#define LZ4_COPYSTEP(s, d) A32(d) = A32(s); d += 4; s += 4;
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#define LZ4_COPYPACKET(s, d) LZ4_COPYSTEP(s, d); LZ4_COPYSTEP(s, d);
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#define LZ4_SECURECOPY LZ4_WILDCOPY
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#define HTYPE const BYTE*
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#define INITBASE(base) const int base = 0
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#endif
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#if (defined(LZ4_BIG_ENDIAN) && !defined(BIG_ENDIAN_NATIVE_BUT_INCOMPATIBLE))
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#define LZ4_READ_LITTLEENDIAN_16(d, s, p) \
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{ U16 v = A16(p); v = lz4_bswap16(v); d = (s) - v; }
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#define LZ4_WRITE_LITTLEENDIAN_16(p, i) \
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{ U16 v = (U16)(i); v = lz4_bswap16(v); A16(p) = v; p += 2; }
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#else
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#define LZ4_READ_LITTLEENDIAN_16(d, s, p) { d = (s) - A16(p); }
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#define LZ4_WRITE_LITTLEENDIAN_16(p, v) { A16(p) = v; p += 2; }
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#endif
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/* Macros */
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#define LZ4_WILDCOPY(s, d, e) do { LZ4_COPYPACKET(s, d) } while (d < e);
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/* Decompression functions */
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static int
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LZ4_uncompress_unknownOutputSize(const char *source,
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char *dest, int isize, int maxOutputSize)
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{
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/* Local Variables */
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const BYTE *restrict ip = (const BYTE *) source;
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const BYTE *const iend = ip + isize;
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const BYTE *restrict ref;
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BYTE *restrict op = (BYTE *) dest;
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BYTE *const oend = op + maxOutputSize;
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BYTE *cpy;
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size_t dec[] = { 0, 3, 2, 3, 0, 0, 0, 0 };
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/* Main Loop */
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while (ip < iend) {
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BYTE token;
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int length;
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/* get runlength */
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token = *ip++;
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if ((length = (token >> ML_BITS)) == RUN_MASK) {
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int s = 255;
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while ((ip < iend) && (s == 255)) {
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s = *ip++;
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length += s;
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}
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}
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/* copy literals */
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cpy = op + length;
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if ((cpy > oend - COPYLENGTH) ||
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(ip + length > iend - COPYLENGTH)) {
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if (cpy > oend)
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/*
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* Error: request to write beyond destination
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* buffer.
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*/
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goto _output_error;
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if (ip + length > iend)
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/*
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* Error : request to read beyond source
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* buffer.
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*/
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goto _output_error;
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memcpy(op, ip, length);
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op += length;
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ip += length;
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if (ip < iend)
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/* Error : LZ4 format violation */
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goto _output_error;
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/* Necessarily EOF, due to parsing restrictions. */
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break;
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}
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LZ4_WILDCOPY(ip, op, cpy);
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ip -= (op - cpy);
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op = cpy;
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/* get offset */
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LZ4_READ_LITTLEENDIAN_16(ref, cpy, ip);
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ip += 2;
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if (ref < (BYTE * const) dest)
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/*
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* Error: offset creates reference outside of
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* destination buffer.
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*/
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goto _output_error;
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/* get matchlength */
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if ((length = (token & ML_MASK)) == ML_MASK) {
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while (ip < iend) {
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int s = *ip++;
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length += s;
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if (s == 255)
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continue;
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break;
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}
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}
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/* copy repeated sequence */
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if unlikely(op - ref < STEPSIZE) {
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#if LZ4_ARCH64
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size_t dec2table[] = { 0, 0, 0, -1, 0, 1, 2, 3 };
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size_t dec2 = dec2table[op - ref];
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#else
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const int dec2 = 0;
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#endif
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*op++ = *ref++;
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*op++ = *ref++;
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*op++ = *ref++;
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*op++ = *ref++;
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ref -= dec[op - ref];
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A32(op) = A32(ref);
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op += STEPSIZE - 4;
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ref -= dec2;
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} else {
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LZ4_COPYSTEP(ref, op);
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}
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cpy = op + length - (STEPSIZE - 4);
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if (cpy > oend - COPYLENGTH) {
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if (cpy > oend)
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/*
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* Error: request to write outside of
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* destination buffer.
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*/
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goto _output_error;
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LZ4_SECURECOPY(ref, op, (oend - COPYLENGTH));
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while (op < cpy)
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*op++ = *ref++;
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op = cpy;
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if (op == oend)
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/*
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* Check EOF (should never happen, since last
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* 5 bytes are supposed to be literals).
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*/
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break;
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continue;
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}
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LZ4_SECURECOPY(ref, op, cpy);
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op = cpy; /* correction */
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}
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/* end of decoding */
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return (int)(((char *)op) - dest);
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/* write overflow error detected */
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_output_error:
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return (int)(-(((char *)ip) - source));
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}
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