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-rw-r--r--app/lzo/src/lzo1a.c645
1 files changed, 0 insertions, 645 deletions
diff --git a/app/lzo/src/lzo1a.c b/app/lzo/src/lzo1a.c
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index e0894f60..00000000
--- a/app/lzo/src/lzo1a.c
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-/* lzo1a.c -- implementation of the LZO1A algorithm
-
- This file is part of the LZO real-time data compression library.
-
- Copyright (C) 1996-2014 Markus Franz Xaver Johannes Oberhumer
- All Rights Reserved.
-
- The LZO library 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 LZO library 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 LZO library; see the file COPYING.
- If not, write to the Free Software Foundation, Inc.,
- 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-
- Markus F.X.J. Oberhumer
- <markus@oberhumer.com>
- http://www.oberhumer.com/opensource/lzo/
- */
-
-
-#include "lzo_conf.h"
-#include "lzo/lzo1a.h"
-
-
-/***********************************************************************
-// The next two defines can be changed to customize LZO1A.
-// The default version is LZO1A-5/1.
-************************************************************************/
-
-/* run bits (3 - 5) - the compressor and the decompressor
- * must use the same value. */
-#if !defined(RBITS)
-# define RBITS 5
-#endif
-
-/* compression level (1 - 9) - this only affects the compressor.
- * 1 is fastest, 9 is best compression ratio
- */
-#if !defined(CLEVEL)
-# define CLEVEL 1 /* fastest by default */
-#endif
-
-
-/* Collect statistics */
-#if 0 && !defined(LZO_COLLECT_STATS)
-# define LZO_COLLECT_STATS 1
-#endif
-
-
-/***********************************************************************
-// You should not have to change anything below this line.
-************************************************************************/
-
-/* check configuration */
-#if (RBITS < 3 || RBITS > 5)
-# error "invalid RBITS"
-#endif
-#if (CLEVEL < 1 || CLEVEL > 9)
-# error "invalid CLEVEL"
-#endif
-
-
-/***********************************************************************
-// internal configuration
-// all of these affect compression only
-************************************************************************/
-
-/* choose the hashing strategy */
-#ifndef LZO_HASH
-#define LZO_HASH LZO_HASH_LZO_INCREMENTAL_A
-#endif
-#define D_INDEX1(d,p) d = DM(DMUL(0x21,DX2(p,5,5)) >> 5)
-#define D_INDEX2(d,p) d = d ^ D_MASK
-
-#include "lzo1a_de.h"
-#include "stats1a.h"
-
-
-/* check other constants */
-#if (LBITS < 5 || LBITS > 8)
-# error "invalid LBITS"
-#endif
-
-
-#if (LZO_COLLECT_STATS)
- static lzo1a_stats_t lzo_statistics;
- lzo1a_stats_t *lzo1a_stats = &lzo_statistics;
-# define lzo_stats lzo1a_stats
-#endif
-
-
-/***********************************************************************
-// get algorithm info, return memory required for compression
-************************************************************************/
-
-LZO_EXTERN(lzo_uint) lzo1a_info ( int *rbits, int *clevel );
-
-LZO_PUBLIC(lzo_uint)
-lzo1a_info ( int *rbits, int *clevel )
-{
- if (rbits)
- *rbits = RBITS;
- if (clevel)
- *clevel = CLEVEL;
- return D_SIZE * lzo_sizeof(lzo_bytep);
-}
-
-
-/***********************************************************************
-// LZO1A decompress a block of data.
-//
-// Could be easily translated into assembly code.
-************************************************************************/
-
-LZO_PUBLIC(int)
-lzo1a_decompress ( const lzo_bytep in , lzo_uint in_len,
- lzo_bytep out, lzo_uintp out_len,
- lzo_voidp wrkmem )
-{
- lzo_bytep op;
- const lzo_bytep ip;
- lzo_uint t;
- const lzo_bytep m_pos;
- const lzo_bytep const ip_end = in + in_len;
-
- LZO_UNUSED(wrkmem);
-
- op = out;
- ip = in;
- while (ip < ip_end)
- {
- t = *ip++; /* get marker */
- LZO_STATS(lzo_stats->marker[t]++);
-
- if (t == 0) /* a R0 literal run */
- {
- t = *ip++;
- if (t >= R0FAST - R0MIN) /* a long R0 run */
- {
- t -= R0FAST - R0MIN;
- if (t == 0)
- t = R0FAST;
- else
- {
-#if 0
- t = 256u << ((unsigned) t);
-#else
- /* help the optimizer */
- lzo_uint tt = 256;
- do tt <<= 1; while (--t > 0);
- t = tt;
-#endif
- }
- MEMCPY8_DS(op,ip,t);
- continue;
- }
- t += R0MIN;
- goto literal;
- }
- else if (t < R0MIN) /* a short literal run */
- {
-literal:
- MEMCPY_DS(op,ip,t);
-
- /* after a literal a match must follow */
- while (ip < ip_end)
- {
- t = *ip++; /* get R1 marker */
- if (t >= R0MIN)
- goto match;
-
- /* R1 match - a context sensitive 3 byte match + 1 byte literal */
- assert((t & OMASK) == t);
- m_pos = op - MIN_OFFSET;
- m_pos -= t | (((lzo_uint) *ip++) << OBITS);
- assert(m_pos >= out); assert(m_pos < op);
- *op++ = m_pos[0];
- *op++ = m_pos[1];
- *op++ = m_pos[2];
- *op++ = *ip++;
- }
- }
- else /* a match */
- {
-match:
- /* get match offset */
- m_pos = op - MIN_OFFSET;
- m_pos -= (t & OMASK) | (((lzo_uint) *ip++) << OBITS);
- assert(m_pos >= out); assert(m_pos < op);
-
- /* get match len */
- if (t < ((MSIZE - 1) << OBITS)) /* a short match */
- {
- t >>= OBITS;
- *op++ = *m_pos++;
- *op++ = *m_pos++;
- MEMCPY_DS(op,m_pos,t);
- }
- else /* a long match */
- {
-#if (LBITS < 8)
- t = (MIN_MATCH_LONG - THRESHOLD) + ((lzo_uint)(*ip++) & LMASK);
-#else
- t = (MIN_MATCH_LONG - THRESHOLD) + (lzo_uint)(*ip++);
-#endif
- *op++ = *m_pos++;
- *op++ = *m_pos++;
- MEMCPY_DS(op,m_pos,t);
-#if (LBITS < 8)
- /* a very short literal following a long match */
- t = ip[-1] >> LBITS;
- if (t) do
- *op++ = *ip++;
- while (--t);
-#endif
- }
- }
- }
-
- *out_len = pd(op, out);
-
- /* the next line is the only check in the decompressor */
- return (ip == ip_end ? LZO_E_OK :
- (ip < ip_end ? LZO_E_INPUT_NOT_CONSUMED : LZO_E_INPUT_OVERRUN));
-}
-
-
-
-/***********************************************************************
-// LZO1A compress a block of data.
-//
-// I apologize for the spaghetti code, but it really helps the optimizer.
-************************************************************************/
-
-#include "lzo1a_cr.ch"
-
-static int
-do_compress ( const lzo_bytep in , lzo_uint in_len,
- lzo_bytep out, lzo_uintp out_len,
- lzo_voidp wrkmem )
-{
- const lzo_bytep ip;
-#if defined(__LZO_HASH_INCREMENTAL)
- lzo_xint dv;
-#endif
- const lzo_bytep m_pos;
- lzo_bytep op;
- const lzo_bytep const ip_end = in+in_len - DVAL_LEN - MIN_MATCH_LONG;
- const lzo_bytep const in_end = in+in_len - DVAL_LEN;
- const lzo_bytep ii;
- lzo_dict_p const dict = (lzo_dict_p) wrkmem;
- const lzo_bytep r1 = ip_end; /* pointer for R1 match (none yet) */
-#if (LBITS < 8)
- const lzo_bytep im = ip_end; /* pointer to last match start */
-#endif
-
-#if !defined(NDEBUG)
- const lzo_bytep m_pos_sav;
-#endif
-
- op = out;
- ip = in;
- ii = ip; /* point to start of current literal run */
-
- /* init dictionary */
-#if (LZO_DETERMINISTIC)
- BZERO8_PTR(wrkmem,sizeof(lzo_dict_t),D_SIZE);
-#endif
-
- DVAL_FIRST(dv,ip); UPDATE_D(dict,0,dv,ip,in); ip++;
- DVAL_NEXT(dv,ip);
-
- do {
- LZO_DEFINE_UNINITIALIZED_VAR(lzo_uint, m_off, 0);
- lzo_uint dindex;
-
- DINDEX1(dindex,ip);
- GINDEX(m_pos,m_off,dict,dindex,in);
- if (LZO_CHECK_MPOS_NON_DET(m_pos,m_off,in,ip,MAX_OFFSET))
- goto literal;
- if (m_pos[0] == ip[0] && m_pos[1] == ip[1] && m_pos[2] == ip[2])
- goto match;
- DINDEX2(dindex,ip);
- GINDEX(m_pos,m_off,dict,dindex,in);
- if (LZO_CHECK_MPOS_NON_DET(m_pos,m_off,in,ip,MAX_OFFSET))
- goto literal;
- if (m_pos[0] == ip[0] && m_pos[1] == ip[1] && m_pos[2] == ip[2])
- goto match;
- goto literal;
-
-literal:
- UPDATE_I(dict,0,dindex,ip,in);
- if (++ip >= ip_end)
- break;
- continue;
-
-match:
- UPDATE_I(dict,0,dindex,ip,in);
-#if !defined(NDEBUG) && (LZO_DICT_USE_PTR)
- assert(m_pos == NULL || m_pos >= in);
- m_pos_sav = m_pos;
-#endif
- m_pos += 3;
- {
- /* we have found a match (of at least length 3) */
-
-#if !defined(NDEBUG) && !(LZO_DICT_USE_PTR)
- assert((m_pos_sav = ip - m_off) == (m_pos - 3));
-#endif
-
- assert(m_pos >= in);
- assert(ip < ip_end);
-
- /* 1) store the current literal run */
- if (pd(ip,ii) > 0)
- {
- lzo_uint t = pd(ip,ii);
-
- if (ip - r1 == MIN_MATCH + 1)
- {
- /* Code a context sensitive R1 match.
- * This is tricky and somewhat difficult to explain:
- * multiplex a literal run of length 1 into the previous
- * short match of length MIN_MATCH.
- * The key idea is:
- * - after a short run a match MUST follow
- * - therefore the value m = 000 in the mmmooooo marker is free
- * - use 000ooooo to indicate a MIN_MATCH match (this
- * is already coded) plus a 1 byte literal
- */
- assert(t == 1);
- /* modify marker byte */
- assert((op[-2] >> OBITS) == (MIN_MATCH - THRESHOLD));
- op[-2] &= OMASK;
- assert((op[-2] >> OBITS) == 0);
- /* copy 1 literal */
- *op++ = *ii;
- LZO_STATS(lzo_stats->r1_matches++);
- r1 = ip; /* set new R1 pointer */
- }
- else if (t < R0MIN)
- {
- /* inline the copying of a short run */
-#if (LBITS < 8)
- if (t < (1 << (8-LBITS)) && ii - im >= MIN_MATCH_LONG)
- {
- /* Code a very short literal run into the
- * previous long match length byte.
- */
- LZO_STATS(lzo_stats->lit_runs_after_long_match++);
- LZO_STATS(lzo_stats->lit_run_after_long_match[t]++);
- assert(ii - im <= MAX_MATCH_LONG);
- assert((op[-1] >> LBITS) == 0);
- op[-1] = LZO_BYTE(op[-1] | (t << LBITS));
- MEMCPY_DS(op, ii, t);
- }
- else
-#endif
- {
- LZO_STATS(lzo_stats->lit_runs++);
- LZO_STATS(lzo_stats->lit_run[t]++);
- *op++ = LZO_BYTE(t);
- MEMCPY_DS(op, ii, t);
- r1 = ip; /* set new R1 pointer */
- }
- }
- else if (t < R0FAST)
- {
- /* inline the copying of a short R0 run */
- LZO_STATS(lzo_stats->r0short_runs++);
- *op++ = 0; *op++ = LZO_BYTE(t - R0MIN);
- MEMCPY_DS(op, ii, t);
- r1 = ip; /* set new R1 pointer */
- }
- else
- op = store_run(op,ii,t);
- }
-#if (LBITS < 8)
- im = ip;
-#endif
-
-
- /* 2) compute match len */
- ii = ip; /* point to start of current match */
-
- /* we already matched MIN_MATCH bytes,
- * m_pos also already advanced MIN_MATCH bytes */
- ip += MIN_MATCH;
- assert(m_pos < ip);
-
- /* try to match another MIN_MATCH_LONG - MIN_MATCH bytes
- * to see if we get a long match */
-
-#define PS *m_pos++ != *ip++
-
-#if (MIN_MATCH_LONG - MIN_MATCH == 2) /* MBITS == 2 */
- if (PS || PS)
-#elif (MIN_MATCH_LONG - MIN_MATCH == 6) /* MBITS == 3 */
- if (PS || PS || PS || PS || PS || PS)
-#elif (MIN_MATCH_LONG - MIN_MATCH == 14) /* MBITS == 4 */
- if (PS || PS || PS || PS || PS || PS || PS ||
- PS || PS || PS || PS || PS || PS || PS)
-#elif (MIN_MATCH_LONG - MIN_MATCH == 30) /* MBITS == 5 */
- if (PS || PS || PS || PS || PS || PS || PS || PS ||
- PS || PS || PS || PS || PS || PS || PS || PS ||
- PS || PS || PS || PS || PS || PS || PS || PS ||
- PS || PS || PS || PS || PS || PS)
-#else
-# error "MBITS not yet implemented"
-#endif
- {
- /* we've found a short match */
- lzo_uint m_len;
-
- /* 2a) compute match parameters */
- assert(ip-m_pos == (int)m_off);
- --ip; /* ran one too far, point back to non-match */
- m_len = pd(ip, ii);
- assert(m_len >= MIN_MATCH_SHORT);
- assert(m_len <= MAX_MATCH_SHORT);
- assert(m_off >= MIN_OFFSET);
- assert(m_off <= MAX_OFFSET);
- assert(ii-m_off == m_pos_sav);
- assert(lzo_memcmp(m_pos_sav,ii,m_len) == 0);
- m_off -= MIN_OFFSET;
-
- /* 2b) code a short match */
- /* code short match len + low offset bits */
- *op++ = LZO_BYTE(((m_len - THRESHOLD) << OBITS) |
- (m_off & OMASK));
- /* code high offset bits */
- *op++ = LZO_BYTE(m_off >> OBITS);
-
-
-#if (LZO_COLLECT_STATS)
- lzo_stats->short_matches++;
- lzo_stats->short_match[m_len]++;
- if (m_off < OSIZE)
- lzo_stats->short_match_offset_osize[m_len]++;
- if (m_off < 256)
- lzo_stats->short_match_offset_256[m_len]++;
- if (m_off < 1024)
- lzo_stats->short_match_offset_1024[m_len]++;
-#endif
-
-
- /* 2c) Insert phrases (beginning with ii+1) into the dictionary. */
-
-#define SI /* nothing */
-#define DI ++ii; DVAL_NEXT(dv,ii); UPDATE_D(dict,0,dv,ii,in);
-#define XI assert(ii < ip); ii = ip; DVAL_FIRST(dv,(ip));
-
-#if (CLEVEL == 9) || (CLEVEL >= 7 && MBITS <= 4) || (CLEVEL >= 5 && MBITS <= 3)
- /* Insert the whole match (ii+1)..(ip-1) into dictionary. */
- ++ii;
- do {
- DVAL_NEXT(dv,ii);
- UPDATE_D(dict,0,dv,ii,in);
- } while (++ii < ip);
- DVAL_NEXT(dv,ii);
- assert(ii == ip);
- DVAL_ASSERT(dv,ip);
-#elif (CLEVEL >= 3)
- SI DI DI XI
-#elif (CLEVEL >= 2)
- SI DI XI
-#else
- XI
-#endif
-
- }
- else
- {
- /* we've found a long match - see how far we can still go */
- const lzo_bytep end;
- lzo_uint m_len;
-
- assert(ip <= in_end);
- assert(ii == ip - MIN_MATCH_LONG);
-
- if (pd(in_end,ip) <= (MAX_MATCH_LONG - MIN_MATCH_LONG))
- end = in_end;
- else
- {
- end = ip + (MAX_MATCH_LONG - MIN_MATCH_LONG);
- assert(end < in_end);
- }
-
- while (ip < end && *m_pos == *ip)
- m_pos++, ip++;
- assert(ip <= in_end);
-
- /* 2a) compute match parameters */
- m_len = pd(ip, ii);
- assert(m_len >= MIN_MATCH_LONG);
- assert(m_len <= MAX_MATCH_LONG);
- assert(m_off >= MIN_OFFSET);
- assert(m_off <= MAX_OFFSET);
- assert(ii-m_off == m_pos_sav);
- assert(lzo_memcmp(m_pos_sav,ii,m_len) == 0);
- assert(pd(ip,m_pos) == m_off);
- m_off -= MIN_OFFSET;
-
- /* 2b) code the long match */
- /* code long match flag + low offset bits */
- *op++ = LZO_BYTE(((MSIZE - 1) << OBITS) | (m_off & OMASK));
- /* code high offset bits */
- *op++ = LZO_BYTE(m_off >> OBITS);
- /* code match len */
- *op++ = LZO_BYTE(m_len - MIN_MATCH_LONG);
-
-
-#if (LZO_COLLECT_STATS)
- lzo_stats->long_matches++;
- lzo_stats->long_match[m_len]++;
-#endif
-
-
- /* 2c) Insert phrases (beginning with ii+1) into the dictionary. */
-#if (CLEVEL == 9)
- /* Insert the whole match (ii+1)..(ip-1) into dictionary. */
- /* This is not recommended because it is slow. */
- ++ii;
- do {
- DVAL_NEXT(dv,ii);
- UPDATE_D(dict,0,dv,ii,in);
- } while (++ii < ip);
- DVAL_NEXT(dv,ii);
- assert(ii == ip);
- DVAL_ASSERT(dv,ip);
-#elif (CLEVEL >= 8)
- SI DI DI DI DI DI DI DI DI XI
-#elif (CLEVEL >= 7)
- SI DI DI DI DI DI DI DI XI
-#elif (CLEVEL >= 6)
- SI DI DI DI DI DI DI XI
-#elif (CLEVEL >= 5)
- SI DI DI DI DI XI
-#elif (CLEVEL >= 4)
- SI DI DI DI XI
-#elif (CLEVEL >= 3)
- SI DI DI XI
-#elif (CLEVEL >= 2)
- SI DI XI
-#else
- XI
-#endif
- }
-
- /* ii now points to the start of the next literal run */
- assert(ii == ip);
- }
-
- } while (ip < ip_end);
-
- assert(ip <= in_end);
-
-
-#if defined(LZO_RETURN_IF_NOT_COMPRESSIBLE)
- /* return -1 if op == out to indicate that we
- * couldn't compress and didn't copy anything.
- */
- if (op == out)
- {
- *out_len = 0;
- return LZO_E_NOT_COMPRESSIBLE;
- }
-#endif
-
- /* store the final literal run */
- if (pd(in_end+DVAL_LEN,ii) > 0)
- op = store_run(op,ii,pd(in_end+DVAL_LEN,ii));
-
- *out_len = pd(op, out);
- return 0; /* compression went ok */
-}
-
-
-/***********************************************************************
-// LZO1A compress public entry point.
-************************************************************************/
-
-LZO_PUBLIC(int)
-lzo1a_compress ( const lzo_bytep in , lzo_uint in_len,
- lzo_bytep out, lzo_uintp out_len,
- lzo_voidp wrkmem )
-{
- int r = LZO_E_OK;
-
-
-#if (LZO_COLLECT_STATS)
- lzo_memset(lzo_stats,0,sizeof(*lzo_stats));
- lzo_stats->rbits = RBITS;
- lzo_stats->clevel = CLEVEL;
- lzo_stats->dbits = DBITS;
- lzo_stats->lbits = LBITS;
- lzo_stats->min_match_short = MIN_MATCH_SHORT;
- lzo_stats->max_match_short = MAX_MATCH_SHORT;
- lzo_stats->min_match_long = MIN_MATCH_LONG;
- lzo_stats->max_match_long = MAX_MATCH_LONG;
- lzo_stats->min_offset = MIN_OFFSET;
- lzo_stats->max_offset = MAX_OFFSET;
- lzo_stats->r0min = R0MIN;
- lzo_stats->r0fast = R0FAST;
- lzo_stats->r0max = R0MAX;
- lzo_stats->in_len = in_len;
-#endif
-
-
- /* don't try to compress a block that's too short */
- if (in_len == 0)
- *out_len = 0;
- else if (in_len <= MIN_MATCH_LONG + DVAL_LEN + 1)
- {
-#if defined(LZO_RETURN_IF_NOT_COMPRESSIBLE)
- r = LZO_E_NOT_COMPRESSIBLE;
-#else
- *out_len = pd(store_run(out,in,in_len), out);
-#endif
- }
- else
- r = do_compress(in,in_len,out,out_len,wrkmem);
-
-
-#if (LZO_COLLECT_STATS)
- lzo_stats->short_matches -= lzo_stats->r1_matches;
- lzo_stats->short_match[MIN_MATCH] -= lzo_stats->r1_matches;
- lzo_stats->out_len = *out_len;
-#endif
-
- return r;
-}
-
-
-/*
-vi:ts=4:et
-*/
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