diff --git a/lzf.h b/lzf.h new file mode 100644 index 0000000000000000000000000000000000000000..919b6e6be2d248e7a22d8ef92ead060facaca011 --- /dev/null +++ b/lzf.h @@ -0,0 +1,100 @@ +/* + * Copyright (c) 2000-2008 Marc Alexander Lehmann + * + * 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. + * + * Alternatively, the contents of this file may be used under the terms of + * the GNU General Public License ("GPL") version 2 or any later version, + * in which case the provisions of the GPL are applicable instead of + * the above. If you wish to allow the use of your version of this file + * only under the terms of the GPL and not to allow others to use your + * version of this file under the BSD license, indicate your decision + * by deleting the provisions above and replace them with the notice + * and other provisions required by the GPL. If you do not delete the + * provisions above, a recipient may use your version of this file under + * either the BSD or the GPL. + */ + +#ifndef LZF_H +#define LZF_H + +/*********************************************************************** +** +** lzf -- an extremely fast/free compression/decompression-method +** http://liblzf.plan9.de/ +** +** This algorithm is believed to be patent-free. +** +***********************************************************************/ + +#define LZF_VERSION 0x0105 /* 1.5, API version */ + +/* + * Compress in_len bytes stored at the memory block starting at + * in_data and write the result to out_data, up to a maximum length + * of out_len bytes. + * + * If the output buffer is not large enough or any error occurs return 0, + * otherwise return the number of bytes used, which might be considerably + * more than in_len (but less than 104% of the original size), so it + * makes sense to always use out_len == in_len - 1), to ensure _some_ + * compression, and store the data uncompressed otherwise (with a flag, of + * course. + * + * lzf_compress might use different algorithms on different systems and + * even different runs, thus might result in different compressed strings + * depending on the phase of the moon or similar factors. However, all + * these strings are architecture-independent and will result in the + * original data when decompressed using lzf_decompress. + * + * The buffers must not be overlapping. + * + * If the option LZF_STATE_ARG is enabled, an extra argument must be + * supplied which is not reflected in this header file. Refer to lzfP.h + * and lzf_c.c. + * + */ +unsigned int +lzf_compress (const void *const in_data, unsigned int in_len, + void *out_data, unsigned int out_len); + +/* + * Decompress data compressed with some version of the lzf_compress + * function and stored at location in_data and length in_len. The result + * will be stored at out_data up to a maximum of out_len characters. + * + * If the output buffer is not large enough to hold the decompressed + * data, a 0 is returned and errno is set to E2BIG. Otherwise the number + * of decompressed bytes (i.e. the original length of the data) is + * returned. + * + * If an error in the compressed data is detected, a zero is returned and + * errno is set to EINVAL. + * + * This function is very fast, about as fast as a copying loop. + */ +unsigned int +lzf_decompress (const void *const in_data, unsigned int in_len, + void *out_data, unsigned int out_len); + +#endif + diff --git a/lzfP.h b/lzfP.h new file mode 100644 index 0000000000000000000000000000000000000000..d533f18292bc2e21949633aca9a997597ad1746e --- /dev/null +++ b/lzfP.h @@ -0,0 +1,159 @@ +/* + * Copyright (c) 2000-2007 Marc Alexander Lehmann + * + * 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. + * + * Alternatively, the contents of this file may be used under the terms of + * the GNU General Public License ("GPL") version 2 or any later version, + * in which case the provisions of the GPL are applicable instead of + * the above. If you wish to allow the use of your version of this file + * only under the terms of the GPL and not to allow others to use your + * version of this file under the BSD license, indicate your decision + * by deleting the provisions above and replace them with the notice + * and other provisions required by the GPL. If you do not delete the + * provisions above, a recipient may use your version of this file under + * either the BSD or the GPL. + */ + +#ifndef LZFP_h +#define LZFP_h + +#define STANDALONE 1 /* at the moment, this is ok. */ + +#ifndef STANDALONE +# include "lzf.h" +#endif + +/* + * Size of hashtable is (1 << HLOG) * sizeof (char *) + * decompression is independent of the hash table size + * the difference between 15 and 14 is very small + * for small blocks (and 14 is usually a bit faster). + * For a low-memory/faster configuration, use HLOG == 13; + * For best compression, use 15 or 16 (or more, up to 23). + */ +#ifndef HLOG +# define HLOG 16 +#endif + +/* + * Sacrifice very little compression quality in favour of compression speed. + * This gives almost the same compression as the default code, and is + * (very roughly) 15% faster. This is the preferred mode of operation. + */ +#ifndef VERY_FAST +# define VERY_FAST 1 +#endif + +/* + * Sacrifice some more compression quality in favour of compression speed. + * (roughly 1-2% worse compression for large blocks and + * 9-10% for small, redundant, blocks and >>20% better speed in both cases) + * In short: when in need for speed, enable this for binary data, + * possibly disable this for text data. + */ +#ifndef ULTRA_FAST +# define ULTRA_FAST 0 +#endif + +/* + * Unconditionally aligning does not cost very much, so do it if unsure + */ +#ifndef STRICT_ALIGN +# define STRICT_ALIGN !(defined(__i386) || defined (__amd64)) +#endif + +/* + * You may choose to pre-set the hash table (might be faster on some + * modern cpus and large (>>64k) blocks, and also makes compression + * deterministic/repeatable when the configuration otherwise is the same). + */ +#ifndef INIT_HTAB +# define INIT_HTAB 0 +#endif + +/* + * Avoid assigning values to errno variable? for some embedding purposes + * (linux kernel for example), this is neccessary. NOTE: this breaks + * the documentation in lzf.h. + */ +#ifndef AVOID_ERRNO +# define AVOID_ERRNO 0 +#endif + +/* + * Wether to pass the LZF_STATE variable as argument, or allocate it + * on the stack. For small-stack environments, define this to 1. + * NOTE: this breaks the prototype in lzf.h. + */ +#ifndef LZF_STATE_ARG +# define LZF_STATE_ARG 0 +#endif + +/* + * Wether to add extra checks for input validity in lzf_decompress + * and return EINVAL if the input stream has been corrupted. This + * only shields against overflowing the input buffer and will not + * detect most corrupted streams. + * This check is not normally noticable on modern hardware + * (<1% slowdown), but might slow down older cpus considerably. + */ +#ifndef CHECK_INPUT +# define CHECK_INPUT 1 +#endif + +/*****************************************************************************/ +/* nothing should be changed below */ + +typedef unsigned char u8; + +typedef const u8 *LZF_STATE[1 << (HLOG)]; + +#if !STRICT_ALIGN +/* for unaligned accesses we need a 16 bit datatype. */ +# include +# if USHRT_MAX == 65535 + typedef unsigned short u16; +# elif UINT_MAX == 65535 + typedef unsigned int u16; +# else +# undef STRICT_ALIGN +# define STRICT_ALIGN 1 +# endif +#endif + +#if ULTRA_FAST +# if defined(VERY_FAST) +# undef VERY_FAST +# endif +#endif + +#if INIT_HTAB +# ifdef __cplusplus +# include +# else +# include +# endif +#endif + +#endif + diff --git a/lzf_c.c b/lzf_c.c new file mode 100644 index 0000000000000000000000000000000000000000..99dab091c623bea94a2b64499bce0e399c67884b --- /dev/null +++ b/lzf_c.c @@ -0,0 +1,295 @@ +/* + * Copyright (c) 2000-2008 Marc Alexander Lehmann + * + * 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. + * + * Alternatively, the contents of this file may be used under the terms of + * the GNU General Public License ("GPL") version 2 or any later version, + * in which case the provisions of the GPL are applicable instead of + * the above. If you wish to allow the use of your version of this file + * only under the terms of the GPL and not to allow others to use your + * version of this file under the BSD license, indicate your decision + * by deleting the provisions above and replace them with the notice + * and other provisions required by the GPL. If you do not delete the + * provisions above, a recipient may use your version of this file under + * either the BSD or the GPL. + */ + +#include "lzfP.h" + +#define HSIZE (1 << (HLOG)) + +/* + * don't play with this unless you benchmark! + * decompression is not dependent on the hash function + * the hashing function might seem strange, just believe me + * it works ;) + */ +#ifndef FRST +# define FRST(p) (((p[0]) << 8) | p[1]) +# define NEXT(v,p) (((v) << 8) | p[2]) +# if ULTRA_FAST +# define IDX(h) ((( h >> (3*8 - HLOG)) - h ) & (HSIZE - 1)) +# elif VERY_FAST +# define IDX(h) ((( h >> (3*8 - HLOG)) - h*5) & (HSIZE - 1)) +# else +# define IDX(h) ((((h ^ (h << 5)) >> (3*8 - HLOG)) - h*5) & (HSIZE - 1)) +# endif +#endif +/* + * IDX works because it is very similar to a multiplicative hash, e.g. + * ((h * 57321 >> (3*8 - HLOG)) & (HSIZE - 1)) + * the latter is also quite fast on newer CPUs, and compresses similarly. + * + * the next one is also quite good, albeit slow ;) + * (int)(cos(h & 0xffffff) * 1e6) + */ + +#if 0 +/* original lzv-like hash function, much worse and thus slower */ +# define FRST(p) (p[0] << 5) ^ p[1] +# define NEXT(v,p) ((v) << 5) ^ p[2] +# define IDX(h) ((h) & (HSIZE - 1)) +#endif + +#define MAX_LIT (1 << 5) +#define MAX_OFF (1 << 13) +#define MAX_REF ((1 << 8) + (1 << 3)) + +#if __GNUC__ >= 3 +# define expect(expr,value) __builtin_expect ((expr),(value)) +# define inline inline +#else +# define expect(expr,value) (expr) +# define inline static +#endif + +#define expect_false(expr) expect ((expr) != 0, 0) +#define expect_true(expr) expect ((expr) != 0, 1) + +/* + * compressed format + * + * 000LLLLL ; literal + * LLLooooo oooooooo ; backref L + * 111ooooo LLLLLLLL oooooooo ; backref L+7 + * + */ + +unsigned int +lzf_compress (const void *const in_data, unsigned int in_len, + void *out_data, unsigned int out_len +#if LZF_STATE_ARG + , LZF_STATE htab +#endif + ) +{ +#if !LZF_STATE_ARG + LZF_STATE htab; +#endif + const u8 **hslot; + const u8 *ip = (const u8 *)in_data; + u8 *op = (u8 *)out_data; + const u8 *in_end = ip + in_len; + u8 *out_end = op + out_len; + const u8 *ref; + + /* off requires a type wide enough to hold a general pointer difference. + * ISO C doesn't have that (size_t might not be enough and ptrdiff_t only + * works for differences within a single object). We also assume that no + * no bit pattern traps. Since the only platform that is both non-POSIX + * and fails to support both assumptions is windows 64 bit, we make a + * special workaround for it. + */ +#if defined (WIN32) && defined (_M_X64) + unsigned _int64 off; /* workaround for missing POSIX compliance */ +#else + unsigned long off; +#endif + unsigned int hval; + int lit; + + if (!in_len || !out_len) + return 0; + +#if INIT_HTAB + memset (htab, 0, sizeof (htab)); +# if 0 + for (hslot = htab; hslot < htab + HSIZE; hslot++) + *hslot++ = ip; +# endif +#endif + + lit = 0; op++; /* start run */ + + hval = FRST (ip); + while (ip < in_end - 2) + { + hval = NEXT (hval, ip); + hslot = htab + IDX (hval); + ref = *hslot; *hslot = ip; + + if (1 +#if INIT_HTAB + && ref < ip /* the next test will actually take care of this, but this is faster */ +#endif + && (off = ip - ref - 1) < MAX_OFF + && ip + 4 < in_end + && ref > (u8 *)in_data +#if STRICT_ALIGN + && ref[0] == ip[0] + && ref[1] == ip[1] + && ref[2] == ip[2] +#else + && *(u16 *)ref == *(u16 *)ip + && ref[2] == ip[2] +#endif + ) + { + /* match found at *ref++ */ + unsigned int len = 2; + unsigned int maxlen = in_end - ip - len; + maxlen = maxlen > MAX_REF ? MAX_REF : maxlen; + + op [- lit - 1] = lit - 1; /* stop run */ + op -= !lit; /* undo run if length is zero */ + + if (expect_false (op + 3 + 1 >= out_end)) + return 0; + + for (;;) + { + if (expect_true (maxlen > 16)) + { + len++; if (ref [len] != ip [len]) break; + len++; if (ref [len] != ip [len]) break; + len++; if (ref [len] != ip [len]) break; + len++; if (ref [len] != ip [len]) break; + + len++; if (ref [len] != ip [len]) break; + len++; if (ref [len] != ip [len]) break; + len++; if (ref [len] != ip [len]) break; + len++; if (ref [len] != ip [len]) break; + + len++; if (ref [len] != ip [len]) break; + len++; if (ref [len] != ip [len]) break; + len++; if (ref [len] != ip [len]) break; + len++; if (ref [len] != ip [len]) break; + + len++; if (ref [len] != ip [len]) break; + len++; if (ref [len] != ip [len]) break; + len++; if (ref [len] != ip [len]) break; + len++; if (ref [len] != ip [len]) break; + } + + do + len++; + while (len < maxlen && ref[len] == ip[len]); + + break; + } + + len -= 2; /* len is now #octets - 1 */ + ip++; + + if (len < 7) + { + *op++ = (off >> 8) + (len << 5); + } + else + { + *op++ = (off >> 8) + ( 7 << 5); + *op++ = len - 7; + } + + *op++ = off; + lit = 0; op++; /* start run */ + + ip += len + 1; + + if (expect_false (ip >= in_end - 2)) + break; + +#if ULTRA_FAST || VERY_FAST + --ip; +# if VERY_FAST && !ULTRA_FAST + --ip; +# endif + hval = FRST (ip); + + hval = NEXT (hval, ip); + htab[IDX (hval)] = ip; + ip++; + +# if VERY_FAST && !ULTRA_FAST + hval = NEXT (hval, ip); + htab[IDX (hval)] = ip; + ip++; +# endif +#else + ip -= len + 1; + + do + { + hval = NEXT (hval, ip); + htab[IDX (hval)] = ip; + ip++; + } + while (len--); +#endif + } + else + { + /* one more literal byte we must copy */ + if (expect_false (op >= out_end)) + return 0; + + lit++; *op++ = *ip++; + + if (expect_false (lit == MAX_LIT)) + { + op [- lit - 1] = lit - 1; /* stop run */ + lit = 0; op++; /* start run */ + } + } + } + + if (op + 3 > out_end) /* at most 3 bytes can be missing here */ + return 0; + + while (ip < in_end) + { + lit++; *op++ = *ip++; + + if (expect_false (lit == MAX_LIT)) + { + op [- lit - 1] = lit - 1; /* stop run */ + lit = 0; op++; /* start run */ + } + } + + op [- lit - 1] = lit - 1; /* end run */ + op -= !lit; /* undo run if length is zero */ + + return op - (u8 *)out_data; +} + diff --git a/lzf_d.c b/lzf_d.c new file mode 100644 index 0000000000000000000000000000000000000000..e7e48c13812a2e5df12c4810b4ab23b54d08d93a --- /dev/null +++ b/lzf_d.c @@ -0,0 +1,150 @@ +/* + * Copyright (c) 2000-2007 Marc Alexander Lehmann + * + * 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. + * + * Alternatively, the contents of this file may be used under the terms of + * the GNU General Public License ("GPL") version 2 or any later version, + * in which case the provisions of the GPL are applicable instead of + * the above. If you wish to allow the use of your version of this file + * only under the terms of the GPL and not to allow others to use your + * version of this file under the BSD license, indicate your decision + * by deleting the provisions above and replace them with the notice + * and other provisions required by the GPL. If you do not delete the + * provisions above, a recipient may use your version of this file under + * either the BSD or the GPL. + */ + +#include "lzfP.h" + +#if AVOID_ERRNO +# define SET_ERRNO(n) +#else +# include +# define SET_ERRNO(n) errno = (n) +#endif + +/* +#if (__i386 || __amd64) && __GNUC__ >= 3 +# define lzf_movsb(dst, src, len) \ + asm ("rep movsb" \ + : "=D" (dst), "=S" (src), "=c" (len) \ + : "0" (dst), "1" (src), "2" (len)); +#endif +*/ + +unsigned int +lzf_decompress (const void *const in_data, unsigned int in_len, + void *out_data, unsigned int out_len) +{ + u8 const *ip = (const u8 *)in_data; + u8 *op = (u8 *)out_data; + u8 const *const in_end = ip + in_len; + u8 *const out_end = op + out_len; + + do + { + unsigned int ctrl = *ip++; + + if (ctrl < (1 << 5)) /* literal run */ + { + ctrl++; + + if (op + ctrl > out_end) + { + SET_ERRNO (E2BIG); + return 0; + } + +#if CHECK_INPUT + if (ip + ctrl > in_end) + { + SET_ERRNO (EINVAL); + return 0; + } +#endif + +#ifdef lzf_movsb + lzf_movsb (op, ip, ctrl); +#else + do + *op++ = *ip++; + while (--ctrl); +#endif + } + else /* back reference */ + { + unsigned int len = ctrl >> 5; + + u8 *ref = op - ((ctrl & 0x1f) << 8) - 1; + +#if CHECK_INPUT + if (ip >= in_end) + { + SET_ERRNO (EINVAL); + return 0; + } +#endif + if (len == 7) + { + len += *ip++; +#if CHECK_INPUT + if (ip >= in_end) + { + SET_ERRNO (EINVAL); + return 0; + } +#endif + } + + ref -= *ip++; + + if (op + len + 2 > out_end) + { + SET_ERRNO (E2BIG); + return 0; + } + + if (ref < (u8 *)out_data) + { + SET_ERRNO (EINVAL); + return 0; + } + +#ifdef lzf_movsb + len += 2; + lzf_movsb (op, ref, len); +#else + *op++ = *ref++; + *op++ = *ref++; + + do + *op++ = *ref++; + while (--len); +#endif + } + } + while (ip < in_end); + + return op - (u8 *)out_data; +} +