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arith_static.c
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arith_static.c
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/*
* Range Coder portion derived from code by Eugene Shelwien (c) 2003.
*/
/*
* Copyright (c) 2014 Genome Research Ltd.
* Author(s): James Bonfield
*
* 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.
*
* 3. Neither the names Genome Research Ltd and Wellcome Trust Sanger
* Institute nor the names of its contributors may be used to endorse
* or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY GENOME RESEARCH LTD 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 GENOME RESEARCH
* LTD 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.
*/
/*
* Author: James Bonfield, Wellcome Trust Sanger Institute. 2014
*/
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <assert.h>
#include <string.h>
#include <float.h>
#include <sys/time.h>
#define ABS(a) ((a)>0?(a):-(a))
#ifndef BLK_SIZE
# define BLK_SIZE 1024*1024
#endif
// Room to allow for expanded BLK_SIZE on worst case compression.
#define BLK_SIZE2 ((int)(1.05*BLK_SIZE+10))
#define UNROLLED
/*-----------------------------------------------------------------------------
* Arithmetic coder. clr.cdr from fqz_comp. Adapted from Eugene Shelwien's
* original from his coders6c2 archive.
*/
/*
* Note it is up to the calling code to ensure that no overruns on input and
* output buffers occur.
*
* Call the input() and output() functions to set and query the current
* buffer locations.
*/
#ifdef __GNUC__
static inline uint32_t i_log2(const uint32_t x) {
return 31-__builtin_clz(x);
}
#else
static inline uint32_t i_log2(const uint32_t x) {
uint32_t y;
asm ( "\tbsr %1, %0\n"
: "=r"(y)
: "r" (x)
);
return y;
}
#endif
#define TOP (1<<24)
#define TF_SHIFT 16
#define TOTFREQ (1<<TF_SHIFT)
typedef unsigned char uc;
typedef struct {
uint64_t low;
uint32_t range, code;
uc *in_buf;
uc *out_buf;
} RngCoder;
double RC_recip[65536];
void RC_init(void) {
int i;
for (i = 0; i < 65536; i++)
RC_recip[i] = (1.0+DBL_EPSILON)/i;
}
//uint32_t RC_recip2b[65536][2];
uint32_t RC_recip3[1<<(32-TF_SHIFT)];
void RC_init2(void) {
int i;
for (i = 1; i < (1<<(32-TF_SHIFT)); i++) {
//double d = 1.0/i;
//d *= ((uint64_t)1)<<32;
//d *= ((uint64_t)1)<<32;
//d += 255;
//RC_recip2b[i][0] = ((uint64_t)d)>>32;
//RC_recip2b[i][1] = (uint64_t)d;
RC_recip3[i] = 1+((1LL<<31) * ((1LL<<(i_log2(i)+1)) - i)) / i;
}
}
static inline void RC_input(RngCoder *rc, char *in) {
rc->out_buf = rc->in_buf = (uc *)in;
}
static inline void RC_output(RngCoder *rc, char *out) {
rc->in_buf = rc->out_buf = (uc *)out;
}
static inline int RC_size_out(RngCoder *rc) {
return rc->out_buf - rc->in_buf;
}
static inline int RC_size_in(RngCoder *rc) {
return rc->in_buf - rc->out_buf;
}
static inline void RC_StartEncode(RngCoder *rc) {
rc->low=0;
rc->range=(uint32_t)-1;
}
static inline void RC_StartDecode(RngCoder *rc) {
int i;
rc->code=0;
rc->low=0;
rc->range=(uint32_t)-1;
for (i = 0; i < 8; i++)
rc->code = (rc->code<<8) | *rc->in_buf++;
}
static inline void RC_FinishEncode(RngCoder *rc) {
int i;
for (i = 0; i < 8; i++) {
*rc->out_buf++ = rc->low>>56;
rc->low<<=8;
}
}
static inline void RC_FinishDecode(RngCoder *rc) {}
static inline void RC_Encode(RngCoder *rc, uint32_t cumFreq, uint32_t freq) {
rc->low += cumFreq * (rc->range >>= TF_SHIFT);
rc->range*= freq;
//if (cumFreq + freq > TOTFREQ) abort();
if (rc->range>=TOP) return;
do {
if ( (uc)((rc->low^(rc->low+rc->range))>>56) )
rc->range = (((uint32_t)rc->low | (TOP-1))-(uint32_t)rc->low);
*rc->out_buf++ = rc->low>>56, rc->range<<=8, rc->low<<=8;
} while (rc->range<TOP);
}
static inline uint32_t RC_GetFreq(RngCoder *rc) {
//fprintf(stderr, "%d / %d = %d\n", rc->code, (rc->range >> TF_SHIFT), rc->code / (rc->range >> TF_SHIFT));
return rc->code / (rc->range >>= TF_SHIFT); // 10.57
//return rc->code * RC_recip[rc->range >>= TF_SHIFT]; // 10.99
#if 1
// 9.94 elapsed
rc->range >>= TF_SHIFT;
uint32_t t = (rc->code * (uint64_t)RC_recip3[rc->range]) >> 31;
return (((rc->code - t)>>1) + t) >> i_log2(rc->range);
//return (rc->code + t) >> (1+i_log2(rc->range));
#endif
#if 0
/* Multiply 32-bit rc->code by 64-bit RC_recip2[rc->range], which is
* split into two 32-bit registers r1, r2.
*
* Alas it's typically slower than the division, but keeping it here
* incase we get old systems that are slower dividing.
*/
rc->range >>= TF_SHIFT;
uint64_t a = rc->code;
uint64_t r1 = a * RC_recip2b[rc->range][0];
uint64_t r2 = a * RC_recip2b[rc->range][1];
return (r1 + (r2>>32)) >> 32;
#endif
}
static inline void RC_Decode(RngCoder *rc, uint32_t cumFreq, uint32_t freq) {
uint32_t temp = cumFreq*rc->range;
rc->low += temp;
rc->code -= temp;
rc->range*= freq;
while (rc->range<TOP) {
if ( (uc)((rc->low^(rc->low+rc->range))>>56) )
rc->range = (((uint32_t)rc->low | (TOP-1))-(uint32_t)rc->low);
rc->code = (rc->code<<8) | *rc->in_buf++, rc->range<<=8, rc->low<<=8;
}
}
#ifdef UNROLLED
/*-----------------------------------------------------------------------------
* Memory to memory compression functions.
*
* These are unrolled 4 or 8 way versions. The input/output is not compatible
* with the original versions, but obviously unrolled encoder works with the
* unrolled decoder
*/
unsigned char *arith_compress_O0(unsigned char *in, unsigned int in_size,
unsigned int *out_size) {
unsigned char *out_buf = malloc(1.05*in_size + 257*257*3 + 21);
unsigned char *cp;
int F[256], C[256], T = 0, i, j, n, i_end;
unsigned char c;
RngCoder rc[8];
char *blk0 = malloc(BLK_SIZE2);
char *blk1 = malloc(BLK_SIZE2);
char *blk2 = malloc(BLK_SIZE2);
char *blk3 = malloc(BLK_SIZE2);
if (!out_buf)
return NULL;
// Compute statistics
memset(F, 0, 256*sizeof(int));
memset(C, 0, 256*sizeof(int));
for (i = 0; i < in_size; i++) {
F[c = in[i]]++;
T++;
}
// Normalise so T[i] == 65536
for (n = j = 0; j < 256; j++)
if (F[j])
n++;
for (j = 0; j < 256; j++) {
if (!F[j])
continue;
if ((F[j] *= ((double)TOTFREQ-n)/T) == 0)
F[j] = 1;
}
// Encode statistis.
// FIXME: use range coder to encode these more efficiently
cp = out_buf+4;
for (T = j = 0; j < 256; j++) {
C[j] = T;
T += F[j];
if (F[j]) {
*cp++ = j;
*cp++ = F[j]>>8;
*cp++ = F[j]&0xff;
}
}
*cp++ = 0;
RC_output(&rc[0], blk0);
RC_output(&rc[1], blk1);
RC_output(&rc[2], blk2);
RC_output(&rc[3], blk3);
RC_StartEncode(&rc[0]);
RC_StartEncode(&rc[1]);
RC_StartEncode(&rc[2]);
RC_StartEncode(&rc[3]);
// Tight encoding loop
i_end = in_size&~3;
for (i = 0; i < i_end; i+=4) {
unsigned char c[4];
c[0] = in[i+0];
c[1] = in[i+1];
c[2] = in[i+2];
c[3] = in[i+3];
RC_Encode(&rc[0], C[c[0]], F[c[0]]);
RC_Encode(&rc[1], C[c[1]], F[c[1]]);
RC_Encode(&rc[2], C[c[2]], F[c[2]]);
RC_Encode(&rc[3], C[c[3]], F[c[3]]);
}
// Tidy up any remainder that isn't a multiple of 4
for (; i < in_size; i++) {
unsigned char c;
c = in[i];
RC_Encode(&rc[0], C[c], F[c]);
}
// Flush encoders and collate buffers
RC_FinishEncode(&rc[0]);
RC_FinishEncode(&rc[1]);
RC_FinishEncode(&rc[2]);
RC_FinishEncode(&rc[3]);
*cp++ = (RC_size_out(&rc[0]) >> 0) & 0xff;
*cp++ = (RC_size_out(&rc[0]) >> 8) & 0xff;
*cp++ = (RC_size_out(&rc[0]) >>16) & 0xff;
*cp++ = (RC_size_out(&rc[0]) >>24) & 0xff;
memcpy(cp, blk0, RC_size_out(&rc[0])); cp += RC_size_out(&rc[0]);
*cp++ = (RC_size_out(&rc[1]) >> 0) & 0xff;
*cp++ = (RC_size_out(&rc[1]) >> 8) & 0xff;
*cp++ = (RC_size_out(&rc[1]) >>16) & 0xff;
*cp++ = (RC_size_out(&rc[1]) >>24) & 0xff;
memcpy(cp, blk1, RC_size_out(&rc[1])); cp += RC_size_out(&rc[1]);
*cp++ = (RC_size_out(&rc[2]) >> 0) & 0xff;
*cp++ = (RC_size_out(&rc[2]) >> 8) & 0xff;
*cp++ = (RC_size_out(&rc[2]) >>16) & 0xff;
*cp++ = (RC_size_out(&rc[2]) >>24) & 0xff;
memcpy(cp, blk2, RC_size_out(&rc[2])); cp += RC_size_out(&rc[2]);
*cp++ = (RC_size_out(&rc[3]) >> 0) & 0xff;
*cp++ = (RC_size_out(&rc[3]) >> 8) & 0xff;
*cp++ = (RC_size_out(&rc[3]) >>16) & 0xff;
*cp++ = (RC_size_out(&rc[3]) >>24) & 0xff;
memcpy(cp, blk3, RC_size_out(&rc[3])); cp += RC_size_out(&rc[3]);
*out_size = cp - out_buf;
cp = out_buf;
*cp++ = (in_size>> 0) & 0xff;
*cp++ = (in_size>> 8) & 0xff;
*cp++ = (in_size>>16) & 0xff;
*cp++ = (in_size>>24) & 0xff;
assert(*out_size < 1.05*in_size + 257*257*3 + 21);
free(blk0);
free(blk1);
free(blk2);
free(blk3);
return out_buf;
}
typedef struct {
struct {
int F;
int C;
} fc[256];
unsigned char *R;
} ari_decoder;
unsigned char *arith_uncompress_O0(unsigned char *in, unsigned int in_size,
unsigned int *out_size) {
/* Load in the static tables */
unsigned char *cp = in + 4;
int i, j, x, out_sz, i_end;
RngCoder rc[4];
unsigned int sz;
char *out_buf;
ari_decoder D;
memset(&D, 0, sizeof(D));
out_sz = ((in[0])<<0) | ((in[1])<<8) | ((in[2])<<16) | ((in[3])<<24);
out_buf = malloc(out_sz);
if (!out_buf)
return NULL;
//fprintf(stderr, "out_sz=%d\n", out_sz);
// Precompute reverse lookup of frequency.
j = *cp++;
x = 0;
do {
D.fc[j].F = (cp[0]<<8) | (cp[1]);
D.fc[j].C = x;
//fprintf(stderr, "j=%d freq=%d cumFreq=%d\n", j, D.fc[j].F, D.fc[j].C);
/* Build reverse lookup table */
if (!D.R) D.R = (unsigned char *)malloc(TOTFREQ);
memset(&D.R[x], j, D.fc[j].F);
x += D.fc[j].F;
cp += 2;
j = *cp++;
} while(j);
sz = cp[0] + (cp[1]<<8) + (cp[2]<<16) + (cp[3]<<24);
RC_input(&rc[0], (char *)cp+4);
RC_StartDecode(&rc[0]);
cp += sz+4;
sz = cp[0] + (cp[1]<<8) + (cp[2]<<16) + (cp[3]<<24);
RC_input(&rc[1], (char *)cp+4);
RC_StartDecode(&rc[1]);
cp += sz+4;
sz = cp[0] + (cp[1]<<8) + (cp[2]<<16) + (cp[3]<<24);
RC_input(&rc[2], (char *)cp+4);
RC_StartDecode(&rc[2]);
cp += sz+4;
sz = cp[0] + (cp[1]<<8) + (cp[2]<<16) + (cp[3]<<24);
RC_input(&rc[3], (char *)cp+4);
RC_StartDecode(&rc[3]);
cp += sz+4;
// Tight decoding loop, unrolled 4-ways
i_end = out_sz&~3;
for (i = 0; i < i_end; i+=4) {
uint32_t freq[4];
unsigned char c[4];
freq[0] = RC_GetFreq(&rc[0]);
freq[1] = RC_GetFreq(&rc[1]);
freq[2] = RC_GetFreq(&rc[2]);
freq[3] = RC_GetFreq(&rc[3]);
c[0] = D.R[freq[0]];
c[1] = D.R[freq[1]];
c[2] = D.R[freq[2]];
c[3] = D.R[freq[3]];
RC_Decode(&rc[0], D.fc[c[0]].C, D.fc[c[0]].F);
RC_Decode(&rc[1], D.fc[c[1]].C, D.fc[c[1]].F);
RC_Decode(&rc[2], D.fc[c[2]].C, D.fc[c[2]].F);
RC_Decode(&rc[3], D.fc[c[3]].C, D.fc[c[3]].F);
out_buf[i+0] = c[0];
out_buf[i+1] = c[1];
out_buf[i+2] = c[2];
out_buf[i+3] = c[3];
}
// Tidy up any remainder that isn't a multiple of 4
for (; i < out_sz; i++) {
uint32_t freq = RC_GetFreq(&rc[0]);
unsigned char c = D.R[freq];
RC_Decode(&rc[0], D.fc[c].C, D.fc[c].F);
out_buf[i] = c;
}
RC_FinishDecode(&rc[0]);
RC_FinishDecode(&rc[1]);
RC_FinishDecode(&rc[2]);
RC_FinishDecode(&rc[3]);
*out_size = out_sz;
if (D.R) free(D.R);
return (unsigned char *)out_buf;
}
unsigned char *arith_compress_O1(unsigned char *in, unsigned int in_size,
unsigned int *out_size) {
unsigned char *out_buf = malloc(1.05*in_size + 257*257*3 + 37);
unsigned char *cp = out_buf;
RngCoder rc[8];
unsigned int last, i, j, i8[8], l8[8], i_end;
int F[256][256], C[256][256], T[256];
unsigned char c;
char *blk = malloc(BLK_SIZE2*8+8);
if (!out_buf || !out_buf) {
if (blk) free(blk);
if (out_buf) free(out_buf);
return NULL;
}
cp = out_buf+4;
memset(F, 0, 256*256*sizeof(int));
memset(C, 0, 256*256*sizeof(int));
memset(T, 0, 256*sizeof(int));
for (last = i = 0; i < in_size; i++) {
F[last][c = in[i]]++;
T[last]++;
last = c;
}
F[0][in[1*(in_size>>3)]]++;
F[0][in[2*(in_size>>3)]]++;
F[0][in[3*(in_size>>3)]]++;
F[0][in[4*(in_size>>3)]]++;
F[0][in[5*(in_size>>3)]]++;
F[0][in[6*(in_size>>3)]]++;
F[0][in[7*(in_size>>3)]]++;
T[0]+=7;
// Normalise so T[i] == 65536
for (i = 0; i < 256; i++) {
int t = T[i], t2, n;
if (t == 0)
continue;
for (n = j = 0; j < 256; j++)
if (F[i][j])
n++;
for (t2 = j = 0; j < 256; j++) {
if (!F[i][j])
continue;
if ((F[i][j] *= ((double)TOTFREQ-n)/t) == 0)
F[i][j] = 1;
t2 += F[i][j];
}
// No need to actually boost frequencies so the real sum is
// 65536. Just accept loss in precision by having a bit of
// rounding at the end.
assert(t2 <= TOTFREQ);
}
//assert(in_size < TOP);
for (i = 0; i < 256; i++) {
unsigned int x = 0;
if (!T[i])
continue;
*cp++ = i;
for (j = 0; j < 256; j++) {
C[i][j] = x;
x += F[i][j];
if (F[i][j]) {
*cp++ = j;
*cp++ = F[i][j]>>8;
*cp++ = F[i][j]&0xff;
}
}
*cp++ = 0;
T[i] = x;
}
*cp++ = 0;
/* Initialise our 8 range coders with their appropriate buffers */
RC_output(&rc[0], blk+0*BLK_SIZE2);
RC_output(&rc[1], blk+1*BLK_SIZE2);
RC_output(&rc[2], blk+2*BLK_SIZE2);
RC_output(&rc[3], blk+3*BLK_SIZE2);
RC_output(&rc[4], blk+4*BLK_SIZE2);
RC_output(&rc[5], blk+5*BLK_SIZE2);
RC_output(&rc[6], blk+6*BLK_SIZE2);
RC_output(&rc[7], blk+7*BLK_SIZE2);
RC_StartEncode(&rc[0]);
RC_StartEncode(&rc[1]);
RC_StartEncode(&rc[2]);
RC_StartEncode(&rc[3]);
RC_StartEncode(&rc[4]);
RC_StartEncode(&rc[5]);
RC_StartEncode(&rc[6]);
RC_StartEncode(&rc[7]);
i_end = (in_size>>3);
i8[0] = 0 * i_end;
i8[1] = 1 * i_end;
i8[2] = 2 * i_end;
i8[3] = 3 * i_end;
i8[4] = 4 * i_end;
i8[5] = 5 * i_end;
i8[6] = 6 * i_end;
i8[7] = 7 * i_end;
/* Main busy loop */
for (l8[0] = l8[1] = l8[2] = l8[3] = l8[4] = l8[5] = l8[6] = l8[7] = 0;
//i8[0] < i_end;
i_end--;
i8[0]++,i8[1]++,i8[2]++,i8[3]++,i8[4]++,i8[5]++,i8[6]++,i8[7]++) {
unsigned char c[8];
c[0] = in[i8[0]];
c[1] = in[i8[1]];
c[2] = in[i8[2]];
c[3] = in[i8[3]];
c[4] = in[i8[4]];
c[5] = in[i8[5]];
c[6] = in[i8[6]];
c[7] = in[i8[7]];
RC_Encode(&rc[0], C[l8[0]][c[0]], F[l8[0]][c[0]]);
RC_Encode(&rc[1], C[l8[1]][c[1]], F[l8[1]][c[1]]);
RC_Encode(&rc[2], C[l8[2]][c[2]], F[l8[2]][c[2]]);
RC_Encode(&rc[3], C[l8[3]][c[3]], F[l8[3]][c[3]]);
RC_Encode(&rc[4], C[l8[4]][c[4]], F[l8[4]][c[4]]);
RC_Encode(&rc[5], C[l8[5]][c[5]], F[l8[5]][c[5]]);
RC_Encode(&rc[6], C[l8[6]][c[6]], F[l8[6]][c[6]]);
RC_Encode(&rc[7], C[l8[7]][c[7]], F[l8[7]][c[7]]);
l8[0] = c[0];
l8[1] = c[1];
l8[2] = c[2];
l8[3] = c[3];
l8[4] = c[4];
l8[5] = c[5];
l8[6] = c[6];
l8[7] = c[7];
}
/* Remainder of buffer for when not a multiple of 8 */
for (; i8[7] < in_size; i8[7]++) {
unsigned char c;
c = in[i8[7]];
RC_Encode(&rc[7], C[l8[7]][c], F[l8[7]][c]);
l8[7] = c;
}
/* Flush encoders */
RC_FinishEncode(&rc[0]);
RC_FinishEncode(&rc[1]);
RC_FinishEncode(&rc[2]);
RC_FinishEncode(&rc[3]);
RC_FinishEncode(&rc[4]);
RC_FinishEncode(&rc[5]);
RC_FinishEncode(&rc[6]);
RC_FinishEncode(&rc[7]);
/* Move decoder output to the final compressed buffer */
*cp++ = (RC_size_out(&rc[0]) >> 0) & 0xff;
*cp++ = (RC_size_out(&rc[0]) >> 8) & 0xff;
*cp++ = (RC_size_out(&rc[0]) >>16) & 0xff;
*cp++ = (RC_size_out(&rc[0]) >>24) & 0xff;
memcpy(cp, blk+0*BLK_SIZE2, RC_size_out(&rc[0]));
cp += RC_size_out(&rc[0]);
*cp++ = (RC_size_out(&rc[1]) >> 0) & 0xff;
*cp++ = (RC_size_out(&rc[1]) >> 8) & 0xff;
*cp++ = (RC_size_out(&rc[1]) >>16) & 0xff;
*cp++ = (RC_size_out(&rc[1]) >>24) & 0xff;
memcpy(cp, blk+1*BLK_SIZE2, RC_size_out(&rc[1]));
cp += RC_size_out(&rc[1]);
*cp++ = (RC_size_out(&rc[2]) >> 0) & 0xff;
*cp++ = (RC_size_out(&rc[2]) >> 8) & 0xff;
*cp++ = (RC_size_out(&rc[2]) >>16) & 0xff;
*cp++ = (RC_size_out(&rc[2]) >>24) & 0xff;
memcpy(cp, blk+2*BLK_SIZE2, RC_size_out(&rc[2]));
cp += RC_size_out(&rc[2]);
*cp++ = (RC_size_out(&rc[3]) >> 0) & 0xff;
*cp++ = (RC_size_out(&rc[3]) >> 8) & 0xff;
*cp++ = (RC_size_out(&rc[3]) >>16) & 0xff;
*cp++ = (RC_size_out(&rc[3]) >>24) & 0xff;
memcpy(cp, blk+3*BLK_SIZE2, RC_size_out(&rc[3]));
cp += RC_size_out(&rc[3]);
*cp++ = (RC_size_out(&rc[4]) >> 0) & 0xff;
*cp++ = (RC_size_out(&rc[4]) >> 8) & 0xff;
*cp++ = (RC_size_out(&rc[4]) >>16) & 0xff;
*cp++ = (RC_size_out(&rc[4]) >>24) & 0xff;
memcpy(cp, blk+4*BLK_SIZE2, RC_size_out(&rc[4]));
cp += RC_size_out(&rc[4]);
*cp++ = (RC_size_out(&rc[5]) >> 0) & 0xff;
*cp++ = (RC_size_out(&rc[5]) >> 8) & 0xff;
*cp++ = (RC_size_out(&rc[5]) >>16) & 0xff;
*cp++ = (RC_size_out(&rc[5]) >>24) & 0xff;
memcpy(cp, blk+5*BLK_SIZE2, RC_size_out(&rc[5]));
cp += RC_size_out(&rc[5]);
*cp++ = (RC_size_out(&rc[6]) >> 0) & 0xff;
*cp++ = (RC_size_out(&rc[6]) >> 8) & 0xff;
*cp++ = (RC_size_out(&rc[6]) >>16) & 0xff;
*cp++ = (RC_size_out(&rc[6]) >>24) & 0xff;
memcpy(cp, blk+6*BLK_SIZE2, RC_size_out(&rc[6]));
cp += RC_size_out(&rc[6]);
*cp++ = (RC_size_out(&rc[7]) >> 0) & 0xff;
*cp++ = (RC_size_out(&rc[7]) >> 8) & 0xff;
*cp++ = (RC_size_out(&rc[7]) >>16) & 0xff;
*cp++ = (RC_size_out(&rc[7]) >>24) & 0xff;
memcpy(cp, blk+7*BLK_SIZE2, RC_size_out(&rc[7]));
cp += RC_size_out(&rc[7]);
*out_size = cp - out_buf;
cp = out_buf;
*cp++ = (in_size>> 0) & 0xff;
*cp++ = (in_size>> 8) & 0xff;
*cp++ = (in_size>>16) & 0xff;
*cp++ = (in_size>>24) & 0xff;
free(blk);
return out_buf;
}
unsigned char *arith_uncompress_O1(unsigned char *in, unsigned int in_size,
unsigned int *out_size) {
/* Load in the static tables */
unsigned char *cp = in + 4;
int i, j, i_end, i8[8], l8[8], x, out_sz;
RngCoder rc[8];
char *out_buf;
ari_decoder D[256];
uint32_t sz;
memset(D, 0, 256*sizeof(*D));
out_sz = ((in[0])<<0) | ((in[1])<<8) | ((in[2])<<16) | ((in[3])<<24);
out_buf = malloc(out_sz);
if (!out_buf)
return NULL;
//fprintf(stderr, "out_sz=%d\n", out_sz);
i = *cp++;
do {
j = *cp++;
x = 0;
do {
D[i].fc[j].F = (cp[0]<<8) | (cp[1]);
D[i].fc[j].C = x;
/* Build reverse lookup table */
if (!D[i].R) D[i].R = (unsigned char *)malloc(TOTFREQ);
memset(&D[i].R[x], j, D[i].fc[j].F);
x += D[i].fc[j].F;
cp += 2;
//fprintf(stderr, "F[%d][%d]=%d\n", i, j, F[i][j]);
j = *cp++;
} while(j);
i = *cp++;
} while (i);
/* Start up the 8 parallel decoders */
sz = cp[0] + (cp[1]<<8) + (cp[2]<<16) + (cp[3]<<24);
RC_input(&rc[0], (char *)cp+4);
cp += sz+4;
sz = cp[0] + (cp[1]<<8) + (cp[2]<<16) + (cp[3]<<24);
RC_input(&rc[1], (char *)cp+4);
cp += sz+4;
sz = cp[0] + (cp[1]<<8) + (cp[2]<<16) + (cp[3]<<24);
RC_input(&rc[2], (char *)cp+4);
cp += sz+4;
sz = cp[0] + (cp[1]<<8) + (cp[2]<<16) + (cp[3]<<24);
RC_input(&rc[3], (char *)cp+4);
cp += sz+4;
sz = cp[0] + (cp[1]<<8) + (cp[2]<<16) + (cp[3]<<24);
RC_input(&rc[4], (char *)cp+4);
cp += sz+4;
sz = cp[0] + (cp[1]<<8) + (cp[2]<<16) + (cp[3]<<24);
RC_input(&rc[5], (char *)cp+4);
cp += sz+4;
sz = cp[0] + (cp[1]<<8) + (cp[2]<<16) + (cp[3]<<24);
RC_input(&rc[6], (char *)cp+4);
cp += sz+4;
sz = cp[0] + (cp[1]<<8) + (cp[2]<<16) + (cp[3]<<24);
RC_input(&rc[7], (char *)cp+4);
cp += sz+4;
RC_StartDecode(&rc[0]);
RC_StartDecode(&rc[1]);
RC_StartDecode(&rc[2]);
RC_StartDecode(&rc[3]);
RC_StartDecode(&rc[4]);
RC_StartDecode(&rc[5]);
RC_StartDecode(&rc[6]);
RC_StartDecode(&rc[7]);
i_end = out_sz>>3;
i8[0] = 0*i_end;
i8[1] = 1*i_end;
i8[2] = 2*i_end;
i8[3] = 3*i_end;
i8[4] = 4*i_end;
i8[5] = 5*i_end;
i8[6] = 6*i_end;
i8[7] = 7*i_end;
/* The main busy loop. Decode from 8 striped locations */
for (l8[0] = l8[1] = l8[2] = l8[3] = l8[4] = l8[5] = l8[6] = l8[7] = 0;
//i < i_end;
i_end--;
i8[0]++,i8[1]++,i8[2]++,i8[3]++,i8[4]++,i8[5]++,i8[6]++,i8[7]++) {
uint32_t freq[8];
unsigned char c[8];
freq[0] = RC_GetFreq(&rc[0]);
freq[1] = RC_GetFreq(&rc[1]);
freq[2] = RC_GetFreq(&rc[2]);
freq[3] = RC_GetFreq(&rc[3]);
freq[4] = RC_GetFreq(&rc[4]);
freq[5] = RC_GetFreq(&rc[5]);
freq[6] = RC_GetFreq(&rc[6]);
freq[7] = RC_GetFreq(&rc[7]);
c[0] = D[l8[0]].R[freq[0]];
c[1] = D[l8[1]].R[freq[1]];
c[2] = D[l8[2]].R[freq[2]];
c[3] = D[l8[3]].R[freq[3]];
c[4] = D[l8[4]].R[freq[4]];
c[5] = D[l8[5]].R[freq[5]];
c[6] = D[l8[6]].R[freq[6]];
c[7] = D[l8[7]].R[freq[7]];
RC_Decode(&rc[0], D[l8[0]].fc[c[0]].C, D[l8[0]].fc[c[0]].F);
RC_Decode(&rc[1], D[l8[1]].fc[c[1]].C, D[l8[1]].fc[c[1]].F);
RC_Decode(&rc[2], D[l8[2]].fc[c[2]].C, D[l8[2]].fc[c[2]].F);
RC_Decode(&rc[3], D[l8[3]].fc[c[3]].C, D[l8[3]].fc[c[3]].F);
RC_Decode(&rc[4], D[l8[4]].fc[c[4]].C, D[l8[4]].fc[c[4]].F);
RC_Decode(&rc[5], D[l8[5]].fc[c[5]].C, D[l8[5]].fc[c[5]].F);
RC_Decode(&rc[6], D[l8[6]].fc[c[6]].C, D[l8[6]].fc[c[6]].F);
RC_Decode(&rc[7], D[l8[7]].fc[c[7]].C, D[l8[7]].fc[c[7]].F);
out_buf[i8[0]] = c[0];
out_buf[i8[1]] = c[1];
out_buf[i8[2]] = c[2];
out_buf[i8[3]] = c[3];
out_buf[i8[4]] = c[4];
out_buf[i8[5]] = c[5];
out_buf[i8[6]] = c[6];
out_buf[i8[7]] = c[7];
l8[0] = c[0];
l8[1] = c[1];
l8[2] = c[2];
l8[3] = c[3];
l8[4] = c[4];
l8[5] = c[5];
l8[6] = c[6];
l8[7] = c[7];
}
/* Remainder */
for (; i8[7] < out_sz; i8[7]++) {
uint32_t freq = RC_GetFreq(&rc[7]);
unsigned char c = D[l8[7]].R[freq];
RC_Decode(&rc[7], D[l8[7]].fc[c].C, D[l8[7]].fc[c].F);
out_buf[i8[7]] = c;
l8[7] = c;
}
/* Tidyup */
RC_FinishDecode(&rc[0]);
RC_FinishDecode(&rc[1]);
RC_FinishDecode(&rc[2]);
RC_FinishDecode(&rc[3]);
RC_FinishDecode(&rc[4]);
RC_FinishDecode(&rc[5]);
RC_FinishDecode(&rc[6]);
RC_FinishDecode(&rc[7]);
*out_size = out_sz;
for (i = 0; i < 256; i++)
if (D[i].R) free(D[i].R);
return (unsigned char *)out_buf;
}
#else /* UNROLLED */
/*-----------------------------------------------------------------------------
* Memory to memory compression functions.
*
* These are original versions without any manual loop unrolling. They
* are easier to understand, but can be up to 2x slower.
*/
unsigned char *arith_compress_O0(unsigned char *in, unsigned int in_size,
unsigned int *out_size) {
unsigned char *out_buf = malloc(1.05*in_size + 257*257*3 + 21);
unsigned char *cp;
RngCoder rc;
int F[256], C[256], T = 0, i, j, n;
unsigned char c;
if (!out_buf)
return NULL;
// Compute statistics
memset(F, 0, 256*sizeof(int));
memset(C, 0, 256*sizeof(int));
for (i = 0; i < in_size; i++) {
F[c = in[i]]++;
T++;
}
// Normalise so T[i] == 65536
for (n = j = 0; j < 256; j++)
if (F[j])
n++;
for (j = 0; j < 256; j++) {
if (!F[j])
continue;
if ((F[j] *= ((double)TOTFREQ-n)/T) == 0)
F[j] = 1;
}
// Encode statistis.
cp = out_buf+4;
for (T = j = 0; j < 256; j++) {
C[j] = T;
T += F[j];
if (F[j]) {
*cp++ = j;
*cp++ = F[j]>>8;
*cp++ = F[j]&0xff;
}
}
*cp++ = 0;
RC_output(&rc, (char *)cp);
RC_StartEncode(&rc);
for (i = 0; i < in_size; i++) {
unsigned char c = in[i];
RC_Encode(&rc, C[c], F[c]);
}
RC_FinishEncode(&rc);
// Finalise block size and return it
*out_size = RC_size_out(&rc) + (cp - out_buf);
cp = out_buf;
*cp++ = (in_size>> 0) & 0xff;
*cp++ = (in_size>> 8) & 0xff;
*cp++ = (in_size>>16) & 0xff;
*cp++ = (in_size>>24) & 0xff;
return out_buf;
}
typedef struct {
struct {
int F;
int C;
} fc[256];
unsigned char *R;
} ari_decoder;
unsigned char *arith_uncompress_O0(unsigned char *in, unsigned int in_size,
unsigned int *out_size) {
/* Load in the static tables */
unsigned char *cp = in + 4, c;
int i, j, x, out_sz;
RngCoder rc;
char *out_buf;
ari_decoder D;
memset(&D, 0, sizeof(D));
out_sz = ((in[0])<<0) | ((in[1])<<8) | ((in[2])<<16) | ((in[3])<<24);
out_buf = malloc(out_sz);
if (!out_buf)
return NULL;
//fprintf(stderr, "out_sz=%d\n", out_sz);
// Precompute reverse lookup of frequency.
{
j = *cp++;
x = 0;
do {
D.fc[j].F = (cp[0]<<8) | (cp[1]);
D.fc[j].C = x;