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anadecompress.c
669 lines (660 loc) · 20.7 KB
/
anadecompress.c
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#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include "types.h"
#include "anadecompress.h"
int anadecrunch32(unsigned char *x,int32_t *array,int r9,int nx,int ny,int little_endian)
/* decompress a bit stream in x; result is n I*4 elements, put in array;
bit slice size r9 */
{
int iq;
int r0=0,r1,r2,nb;
int j,in,i,k,ix,iy, mask;
long long y64;
unsigned char xq;
union { int i; short w; unsigned char b[4]; } y;
union { long long l64; unsigned char b[8]; } yy;
/* begin execution */
mask=1; for (i=0;i<r9;i++) mask=2*mask; mask=mask-1;
/* printf("slice width = %d\n",r9); */
/* printf ("mask = %x, %d\n",mask,mask); */
/* determine the # of bytes to transfer to 32 bit int for fixed portion */
nb = (r9 + 14)/8; /* range 1 to 5 */
if (r9 == 0) nb=0; /* but slice = 0 a special case */
/* printf("nb = %d\n", nb); */
y.i=0;
i=0; r1=0; in=0;
for (iy=0;iy<ny;iy++) { /* start of iy (outer) loop */
/* get the first value, 4 bytes */
if(little_endian){
y.b[0]=x[i]; y.b[1]=x[i+1]; y.b[2]=x[i+2]; y.b[3]=x[i+3];
iq = array[in++]=y.i;
}else{
y.b[0]=x[i+3]; y.b[1]=x[i+2]; y.b[2]=x[i+1]; y.b[3]=x[i];
iq = array[in++]=y.i;
}
/*printf("first value = %d 0x%x\n",iq, iq);*/
r1=r1+32;
r2=0;
for (ix=1; ix<nx; ix++) {
/* first the fixed slice portion */
i=r1/8; j=r1%8;
if(little_endian){
yy.b[0]=x[i];
if (nb>1) { yy.b[1]=x[i+1]; if (nb>2) { yy.b[2]=x[i+2];
if (nb>3) { yy.b[3]=x[i+3];
if (nb>4) { yy.b[4]=x[i+4];
}}}}
}else{
yy.b[7]=x[i];
if (nb>1) { yy.b[6]=x[i+1]; if (nb>2) { yy.b[5]=x[i+2];
if (nb>3) { yy.b[4]=x[i+3];
if (nb>4) { yy.b[3]=x[i+4];
}}}}
}
/* shift and mask out the bit slice */
r2= (int) ((yy.l64>>j) & mask);
/*printf("r2 = %x, %d\n",r2,r2);*/
/* the variable bit portion, find the first set bit */
r1=r1+r9; /* bump r1 pass the fixed part */
i=r1/8; j=r1%8;
if ((xq= (x[i]>>j) ) != 0) {
/* caught it on first byte, find the bit */
if ((xq&1) != 0) r0=1; else {
if ((xq&2) != 0) r0=2; else {
if ((xq&4) != 0) r0=3; else {
if ((xq&8) != 0) r0=4; else {
if ((xq&16) != 0) r0=5; else {
if ((xq&32) != 0) r0=6; else {
if ((xq&64) != 0) r0=7; else {
if ((xq&128) != 0) r0=8; }}}}}}}} else {
/* not in first byte (or part of one) checked, carry on, first count bits in
that first byte */
r0=8-j;
/* check up to 4 more bytes, if not found than an error */
for (k=i+1;k<i+5;k++) { if ( (xq=x[k]) != 0 ) {
/* caught it here, find the bit and then jump from loop */
if ((xq&1) != 0) r0+=1; else {
if ((xq&2) != 0) r0+=2; else {
if ((xq&4) != 0) r0+=3; else {
if ((xq&8) != 0) r0+=4; else {
if ((xq&16) != 0) r0+=5; else {
if ((xq&32) != 0) r0+=6; else {
if ((xq&64) != 0) r0+=7; else {
if ((xq&128) != 0) r0+=8; }}}}}}} break; } else { r0=r0+8;
/* add 8 bits for each all zero byte */
if (r0 > 32) { fprintf(stderr,"DECRUNCH -- bad bit sequence, cannot continue\n");
fprintf(stderr,"i = %d, r1 = %d, ix= %d, iy = %d\n",i,r1,ix,iy);
return -1; } } } }
r1=r1+r0; /* update pointer */
/* r0 even or odd determines sign of difference */
/*printf("r0 = %d\n", r0);*/
if ((r0&1) != 0) {
/* positive case */
/*printf("plus case, r0, r2, iq = %d %d %d\n", r0, r2, iq);*/
r0=(r0/2)<<r9; iq=iq+r2; iq=iq+r0; array[in]=iq;
/*printf("r0 now = %d\n", r0);*/
} else
{ if (r0 == 32) {
/* a long one, yank out the next 33 bits and use as difference */
i=r1/8; j=r1%8;
if(little_endian){
yy.b[0]=x[i];
yy.b[1]=x[i+1]; yy.b[2]=x[i+2]; yy.b[3]=x[i+3]; yy.b[4]=x[i+4];
}else{
yy.b[7]=x[i];
yy.b[6]=x[i+1]; yy.b[5]=x[i+2]; yy.b[4]=x[i+3]; yy.b[3]=x[i+4];
}
/* shift and mask out the 33 bit slice */
y64=(yy.l64>>j) & 0x1ffffffffLL;
r1=r1+33;
/* if the top bit was set, do a sign extend, note that 64 bit arithmetic used*/
if ( (y64 & 0x100000000LL) != 0 ) y64 = y64 | 0xffffffff00000000LL;
y64 = y64 + (long long) array[in-1];
iq = array[in]= (long) y64;
} else {
/* minus case (normal) */
/*printf("minus case, r0, r2, iq = %d %d %d\n", r0, r2, iq);*/
r0=(-r0/2)<<r9; iq=iq+r2; iq=iq+r0; array[in]=iq;
}}
in=in+1; } /* end of ix loop */
i=(r1+7)/8; r1=8*i; } /* end of iy loop */
return 1;
} /* end of routine */
/*--------------------------------------------------------------------------*/
int anadecrunch(unsigned char *x,int16_t *array,int r9,int nx,int ny,int little_endian)
/* decompress a bit stream in x; result is n I*2 elements, put in array;
bit slice size r9 */
{
short iq;
int r0=0,r1,r2,r4,nb,mask;
int j,in,i,k,ix,iy;
unsigned char xq;
union {
int i;
short w;
unsigned char b[4];
} y;
/* begin execution */
mask=1;
for (i=0;i<r9;i++) mask=2*mask;
mask=mask-1;
/*printf("slice width = %d\n",r9);*/
/*printf ("mask = %x, %d\n",mask,mask);*/
/* determine the # of bytes to transfer to 32 bit int for fixed portion */
if (r9 == 0) nb=0;
else if (r9 < 2 ) nb=1;
else if (r9 < 10) nb=2;
else nb=3;
y.i=0;
i=0;
r1=0;
in=0;
for (iy=0; iy<ny; iy++) { // start of iy (outer) loop
// get the first value
if (little_endian) {
y.b[0] = x[i];
y.b[1] = x[i+1];
iq = y.w;
array[in++] = iq;
}
else {
y.b[0] = x[i+1];
y.b[1] = x[i];
iq = y.w;
array[in++] = iq;
}
// printf("first value = %d 0x%x\n",iq, iq);
r1=r1+16;
r2=0;
for (ix=1; ix<nx; ix++) {
// first the fixed slice portion */
i=r1/8;
j=r1%8;
if (little_endian) y.b[0]=x[i];
else y.b[3]=x[i];
// test effect on timing
if (little_endian) {
if (nb>1) {
y.b[1]=x[i+1];
if (nb>2) y.b[2]=x[i+2];
}
}
else {
if (nb>1) {
y.b[2]=x[i+1];
if (nb>2) y.b[1]=x[i+2];
}
}
// shift and mask out the bit slice
r2 = (y.i>>j) & mask;
//printf("r2 = %x, %d\n",r2,r2);
// the variable bit portion, find the first set bit
r1=r1+r9; // bump r1 pass the fixed part
i=r1/8;
j=r1%8;
if ((xq=x[i]>>j) != 0) {
// caught it on first byte, find the bit
if ((xq&1) != 0) r0=1;
else if ((xq&2) != 0) r0=2;
else if ((xq&4) != 0) r0=3;
else if ((xq&8) != 0) r0=4;
else if ((xq&16) != 0) r0=5;
else if ((xq&32) != 0) r0=6;
else if ((xq&64) != 0) r0=7;
else if ((xq&128) != 0) r0=8;
}
else {
// not in first byte (or part of one) checked, carry on, first
// count bits in that first byte
r0=8-j;
// check up to 4 more bytes, if not found than an error
for (k=i+1; k<i+5; k++) {
if ( (xq=x[k]) != 0 ) {
// caught it here, find the bit and then jump from
// loop
if ((xq&1) != 0) r0+=1;
else if ((xq&2) != 0) r0+=2;
else if ((xq&4) != 0) r0+=3;
else if ((xq&8) != 0) r0+=4;
else if ((xq&16) != 0) r0+=5;
else if ((xq&32) != 0) r0+=6;
else if ((xq&64) != 0) r0+=7;
else if ((xq&128) != 0) r0+=8;
break;
}
else {
r0=r0+8;
// add 8 bits for each all zero byte
if (r0 > 32) {
fprintf(stderr,"DECRUNCH -- bad bit sequence, cannot continue\n");
fprintf(stderr,"i = %d, r1 = %d, ix= %d, iy = %d\n",i,r1,ix,iy);
return -1;
}
}
}
}
r1=r1+r0; // update pointer
/* r0 even or odd determines sign of difference */
if ((r0&1) != 0) {
/* positive case */
r0=(r0/2)<<r9;
iq=iq+r2;
iq=iq+r0;
array[in]=iq;
}
else {
if (r0 == 32) {
// a long one, yank out the next 17 bits and use as
// difference
i=r1/8;
j=r1%8;
if (little_endian) {
y.b[0]=x[i];
y.b[1]=x[i+1];
y.b[2]=x[i+2];
}
else {
y.b[3]=x[i];
y.b[2]=x[i+1];
y.b[1]=x[i+2];
}
// shift and mask out the 17 bit slice
r2=(y.i>>j) & 0x1ffff;
r1=r1+17;
// if the top bit was set, do a sign extend, note that 32
// bit arithmetic used
if ( (r2& 0x10000) != 0 ) r2=r2 | 0xffff0000;
r4=array[in-1];
r4=r4+r2;
array[in]=r4;
iq=r4;
}
else {
// minus case (normal) */
r0=(-r0/2)<<r9;
iq=iq+r2;
iq=iq+r0;
array[in]=iq;
}
}
in=in+1;
} /* end of ix loop */
i=(r1+7)/8;
r1=8*i;
} /* end of iy loop */
return 1;
} /* end of routine */
/*--------------------------------------------------------------------------*/
int anadecrunch8(unsigned char *x,int8_t *array,int r9,int nx,int ny,int little_endian)
/* decompress a bit stream in x; result is n I*1 elements, put in array;
bit slice size r9 */
{
uint8_t iq;
int r0=0,r1,r2,r4,nb,mask;
int j,in,i,k,ix,iy;
uint8_t xq;
union { int i; short w; unsigned char b[4]; } y;
/* begin execution */
mask=1; for (i=0;i<r9;i++) mask=2*mask; mask=mask-1;
/* determine the # of bytes to transfer to 32 bit int for fixed portion */
if (r9 == 0) nb=0; else { if (r9 < 2 ) nb=1;
else { if (r9 < 10) nb=2; else nb=3; }};
y.i=0;
i=0; r1=0; in=0;
for (iy=0;iy<ny;iy++) { /* start of iy (outer) loop */
/* get the first value */
iq=x[i]; array[in++]=iq;
r1=r1+8;
r2=0;
for (ix=1; ix<nx; ix++) {
/* first the fixed slice portion */
i=r1/8; j=r1%8;
if(little_endian){
y.b[0]=x[i];
if (nb>1) { y.b[1]=x[i+1]; if (nb>2) y.b[2]=x[i+2]; }
}else{
y.b[3]=x[i];
if (nb>1) { y.b[2]=x[i+1]; if (nb>2) y.b[1]=x[i+2]; }
}
/* shift and mask out the bit slice */
r2=(y.i>>j) & mask;
/* the variable bit portion, find the first set bit */
r1=r1+r9; /* bump r1 pass the fixed part */
i=r1/8; j=r1%8;
if ((xq=x[i]>>j) != 0) {
/* caught it on first byte, find the bit */
if ((xq&1) != 0) r0=1; else {
if ((xq&2) != 0) r0=2; else {
if ((xq&4) != 0) r0=3; else {
if ((xq&8) != 0) r0=4; else {
if ((xq&16) != 0) r0=5; else {
if ((xq&32) != 0) r0=6; else {
if ((xq&64) != 0) r0=7; else {
if ((xq&128) != 0) r0=8; }}}}}}}} else {
/* not in first byte (or part of one) checked, carry on, first count bits in
that first byte */
r0=8-j;
/* check up to 4 more bytes, if not found than an error */
for (k=i+1;k<i+5;k++) { if ( (xq=x[k]) != 0 ) {
/* caught it here, find the bit and then jump from loop */
if ((xq&1) != 0) r0+=1; else {
if ((xq&2) != 0) r0+=2; else {
if ((xq&4) != 0) r0+=3; else {
if ((xq&8) != 0) r0+=4; else {
if ((xq&16) != 0) r0+=5; else {
if ((xq&32) != 0) r0+=6; else {
if ((xq&64) != 0) r0+=7; else {
if ((xq&128) != 0) r0+=8; }}}}}}} break; } else { r0=r0+8;
/* add 8 bits for each all zero byte */
if (r0 > 32) { fprintf(stderr,"DECRUNCH -- bad bit sequence, cannot continue");
return -1; } } } }
r1=r1+r0; /* update pointer */
/* r0 even or odd determines sign of difference */
if ((r0&1) != 0) {
/* positive case */
r0=(r0/2)<<r9; iq=iq+r2; iq=iq+r0; array[in]=iq;
} else
{ if (r0 == 32) {
/* a long one, yank out the next 9 bits and use as difference */
i=r1/8; j=r1%8;
if(little_endian){
y.b[0]=x[i];
y.b[1]=x[i+1];
}else{
y.b[3]=x[i];
y.b[2]=x[i+1];
}
/* shift and mask out the 9 bit slice */
r2=(y.i>>j) & 0x1ff;
r1=r1+9;
/* if the top bit was set, do a sign extend, note that 32 bit arithmetic used*/
if ( (r2& 0x100) != 0 ) r2=r2 | 0xffffff00;
r4=array[in-1]; r4=r4+r2; array[in]=r4; iq=r4;
} else {
/* minus case (normal) */
r0=(-r0/2)<<r9; iq=iq+r2; iq=iq+r0; array[in]=iq;
} }
in=in+1; } /* end of ix loop */
i=(r1+7)/8; r1=8*i; } /* end of iy loop */
return 1;
} /* end of routine */
/*--------------------------------------------------------------------------*/
int anadecrunchrun(unsigned char *x,int16_t *array,int r9,int nx,int ny,int little_endian)
/* decompress a bit stream in x; result is n I*2 elements, put in array;
bit slice size r9 */
/* this version handles the run length encoding used in anacrunchrun */
{
short iq;
int r0=0,r1,r2,r4,nb,mask,nrun,n,nc;
int j,in,i,k,iy;
unsigned char xq;
union { int i; short w; unsigned char b[4]; } y;
/* begin execution */
mask=1; for (i=0;i<r9;i++) mask=2*mask; mask=mask-1;
/*printf("slice width = %d\n",r9);*/
/*printf ("mask = %x, %d\n",mask,mask);*/
/* determine the # of bytes to transfer to 32 bit int for fixed portion */
if (r9 == 0) nb=0; else { if (r9 < 2 ) nb=1;
else { if (r9 < 10) nb=2; else nb=3; }};
y.i=0;
i=0; r1=0; in=0;
for (iy=0;iy<ny;iy++) { /* start of iy (outer) loop */
/* get the first value, assume bytes reversed */
if(little_endian){
y.b[0]=x[i++]; y.b[1]=x[i++]; iq=y.w; array[in++]=iq;
}else{
y.b[1]=x[i++]; y.b[0]=x[i++]; iq=y.w; array[in++]=iq;
}
/* printf("first value = %d 0x%x\n",iq, iq); */
r1=r1+16;
r2=0;
nc=nx-1;
while (nc>0) {
/* look at the next run length code */
/* printf("i = %d\n", i); */
nrun = (int) x[i++];
/* printf("nrun = %d\n", nrun); */
if (nrun > 127) { /* a run of a constant difference */
n = 255 - nrun + 2;
nc = nc - n;
if(little_endian){
y.b[0]=x[i++]; y.b[1]=x[i++];
}else{
y.b[1]=x[i++]; y.b[0]=x[i++];
}
/* printf("increment (run) = %d\n", y.w); */
while (n--) {
array[in] = array[in-1] + y.w; in++;
}
iq = array[in-1]; r1=8*i;
} else { /* a literal */
r1 = 8 * i;
nc = nc - nrun;
while(nrun--) {
/* first the fixed slice portion */
i=r1/8; j=r1%8;
/* printf("start literal, i,r1 = %d %d\n", i,r1); */
if(little_endian){
y.b[0]=x[i];
/* test effect on timing */
if (nb>1) { y.b[1]=x[i+1]; if (nb>2) y.b[2]=x[i+2]; }
}else{
y.b[3]=x[i];
/* test effect on timing */
if (nb>1) { y.b[2]=x[i+1]; if (nb>2) y.b[1]=x[i+2]; }
}
/* shift and mask out the bit slice */
r2=(y.i>>j) & mask;
/* printf("r2 = %x, %d\n",r2,r2);*/
/* the variable bit portion, find the first set bit */
r1=r1+r9; /* bump r1 pass the fixed part */
i=r1/8; j=r1%8;
if ((xq=x[i]>>j) != 0) {
/* caught it on first byte, find the bit */
if ((xq&1) != 0) r0=1; else {
if ((xq&2) != 0) r0=2; else {
if ((xq&4) != 0) r0=3; else {
if ((xq&8) != 0) r0=4; else {
if ((xq&16) != 0) r0=5; else {
if ((xq&32) != 0) r0=6; else {
if ((xq&64) != 0) r0=7; else {
if ((xq&128) != 0) r0=8; }}}}}}}} else {
/* not in first byte (or part of one) checked, carry on, first count bits in
that first byte */
r0=8-j;
/* check up to 4 more bytes, if not found than an error */
for (k=i+1;k<i+5;k++) { if ( (xq=x[k]) != 0 ) {
/* caught it here, find the bit and then jump from loop */
if ((xq&1) != 0) r0+=1; else {
if ((xq&2) != 0) r0+=2; else {
if ((xq&4) != 0) r0+=3; else {
if ((xq&8) != 0) r0+=4; else {
if ((xq&16) != 0) r0+=5; else {
if ((xq&32) != 0) r0+=6; else {
if ((xq&64) != 0) r0+=7; else {
if ((xq&128) != 0) r0+=8; }}}}}}} break; } else { r0=r0+8;
/* add 8 bits for each all zero byte */
if (r0 > 32) { fprintf(stderr,"DECRUNCH -- bad bit sequence, cannot continue\n");
fprintf(stderr,"i = %d, r1 = %d, iy = %d\n",i,r1,iy);
return -1; } } } }
r1=r1+r0; /* update pointer */
/* r0 even or odd determines sign of difference */
if ((r0&1) != 0) {
/* positive case */
r0=(r0/2)<<r9; iq=iq+r2; iq=iq+r0; array[in]=iq;
/* printf("r0,r2,iq = %d %d %d\n", r0,r2,iq);*/
} else
{ if (r0 == 32) {
/* a long one, yank out the next 17 bits and use as difference */
i=r1/8; j=r1%8;
if(little_endian){
y.b[0]=x[i];
y.b[1]=x[i+1]; y.b[2]=x[i+2];
}else{
y.b[3]=x[i];
y.b[2]=x[i+1]; y.b[1]=x[i+2];
}
/* shift and mask out the 17 bit slice */
r2=(y.i>>j) & 0x1ffff;
r1=r1+17;
/* if the top bit was set, do a sign extend, note that 32 bit arithmetic used*/
if ( (r2& 0x10000) != 0 ) r2=r2 | 0xffff0000;
/* printf("big one, r2 = %d, array[in-1] = %d\n", r2, array[in-1]);*/
r4=array[in-1]; r4=r4+r2; array[in]=r4; iq=r4;
} else {
/* minus case (normal) */
r0=(-r0/2)<<r9; iq=iq+r2; iq=iq+r0; array[in]=iq;
/* printf("r0,r2,iq = %d %d %d\n", r0,r2,iq); */
}}
/* printf("end literal, i,r1 = %d %d\n", i,r1); */
in=in+1;
}
/* printf("r1, i after nrun exhausted = %d %d\n",r1,i); */
i=(r1+7)/8; r1=8*i;
/* printf("new i = %d\n",i); */
}
} /* end of ix loop */
if (nc < 0) {
fprintf(stderr,"bad loop in decrunchrun, nc=%d, iy=%d, in= %d\n",nc,iy,in); return -1; }
i=(r1+7)/8; r1=8*i; } /* end of iy loop */
return 1;
} /* end of routine */
/*--------------------------------------------------------------------------*/
int anadecrunchrun8(unsigned char *x,int8_t *array,int r9,int nx,int ny,int little_endian)
/* decompress a bit stream in x; result is n I*2 elements, put in array;
bit slice size r9 */
/* this version handles the run length encoding used in anacrunchrun */
{
uint8_t iq;
int r0=0,r1,r2,r4,nb,mask,nrun,n,nc;
int j,in,i,k,iy;
unsigned char xq;
union { int i; short w; unsigned char b[4]; } y;
/* begin execution */
mask=1; for (i=0;i<r9;i++) mask=2*mask; mask=mask-1;
/* determine the # of bytes to transfer to 32 bit int for fixed portion */
if (r9 == 0) nb=0; else { if (r9 < 2 ) nb=1;
else { if (r9 < 10) nb=2; else nb=3; }};
y.i=0;
i=0; r1=0; in=0;
for (iy=0;iy<ny;iy++) { /* start of iy (outer) loop */
/* get the first value */
iq=x[i++]; array[in++]=iq;
/* printf("first value = %d 0x%x\n",iq, iq); */
r1=r1+16;
r2=0;
nc=nx-1;
/* printf("nc = %d\n", nc); */
while (nc>0) {
/* look at the next run length code */
/* printf("i = %d\n", i); */
nrun = (int) x[i++];
/* printf("nrun = %d\n", nrun); */
if (nrun > 127) { /* a run of a constant difference */
n = 255 - nrun + 2;
nc = nc - n;
if(little_endian){
y.b[0]=x[i++]; y.b[1]=x[i++];
}else{
y.b[1]=x[i++]; y.b[0]=x[i++];
}
/* printf("increment (run) = %d of length %d\n", y.w,n); */
while (n--) {
array[in] = array[in-1] + y.w; in++;
}
iq = array[in-1]; r1=8*i;
} else { /* a literal */
r1 = 8 * i;
nc = nc - nrun;
while(nrun--) {
/* first the fixed slice portion */
i=r1/8; j=r1%8;
/* printf("start literal, i,r1 = %d %d\n", i,r1); */
if(little_endian){
y.b[0]=x[i];
/* test effect on timing */
if (nb>1) { y.b[1]=x[i+1]; if (nb>2) y.b[2]=x[i+2]; }
}else{
y.b[3]=x[i];
/* test effect on timing */
if (nb>1) { y.b[2]=x[i+1]; if (nb>2) y.b[1]=x[i+2]; }
}
/* shift and mask out the bit slice */
r2=(y.i>>j) & mask;
/* the variable bit portion, find the first set bit */
r1=r1+r9; /* bump r1 pass the fixed part */
i=r1/8; j=r1%8;
if ((xq=x[i]>>j) != 0) {
/* caught it on first byte, find the bit */
if ((xq&1) != 0) r0=1; else {
if ((xq&2) != 0) r0=2; else {
if ((xq&4) != 0) r0=3; else {
if ((xq&8) != 0) r0=4; else {
if ((xq&16) != 0) r0=5; else {
if ((xq&32) != 0) r0=6; else {
if ((xq&64) != 0) r0=7; else {
if ((xq&128) != 0) r0=8; }}}}}}}} else {
/* not in first byte (or part of one) checked, carry on, first count bits in
that first byte */
r0=8-j;
/* check up to 4 more bytes, if not found than an error */
for (k=i+1;k<i+5;k++) { if ( (xq=x[k]) != 0 ) {
/* caught it here, find the bit and then jump from loop */
if ((xq&1) != 0) r0+=1; else {
if ((xq&2) != 0) r0+=2; else {
if ((xq&4) != 0) r0+=3; else {
if ((xq&8) != 0) r0+=4; else {
if ((xq&16) != 0) r0+=5; else {
if ((xq&32) != 0) r0+=6; else {
if ((xq&64) != 0) r0+=7; else {
if ((xq&128) != 0) r0+=8; }}}}}}} break; } else { r0=r0+8;
/* add 8 bits for each all zero byte */
if (r0 > 32) { fprintf(stderr,"DECRUNCH -- bad bit sequence, cannot continue\n");
fprintf(stderr,"i = %d, r1 = %d, iy = %d\n",i,r1,iy);
return -1; } } } }
r1=r1+r0; /* update pointer */
/* r0 even or odd determines sign of difference */
if ((r0&1) != 0) {
/* positive case */
r0=(r0/2)<<r9; iq=iq+r2; iq=iq+r0; array[in]=iq;
/* printf("r0,r2,iq = %d %d %d\n", r0,r2,iq);*/
} else
{ if (r0 == 32) {
/* a long one, yank out the next 9 bits and use as difference */
i=r1/8; j=r1%8;
if(little_endian){
y.b[0]=x[i];
y.b[1]=x[i+1];
}else{
y.b[3]=x[i];
y.b[2]=x[i+1];
}
/* shift and mask out the 9 bit slice */
r2=(y.i>>j) & 0x1ff;
r1=r1+9;
/* if the top bit was set, do a sign extend, note that 32 bit arithmetic used*/
if ( (r2& 0x100) != 0 ) r2=r2 | 0xffffff00;
/* printf("long one decoded, r2 = %d, array[in-1]=%d\n", r2, array[in-1]); */
r4=array[in-1]; r4=r4+r2; array[in]=r4; iq=r4;
} else {
/* minus case (normal) */
r0=(-r0/2)<<r9; iq=iq+r2; iq=iq+r0; array[in]=iq;
/* printf("r0,r2,iq = %d %d %d\n", r0,r2,iq); */
}}
/* printf("end literal, i,r1 = %d %d\n", i,r1); */
in=in+1;
}
/* printf("r1, i after literal nrun exhausted = %d %d\n",r1,i); */
i=(r1+7)/8; r1=8*i;
/* printf("new i = %d\n",i); */
}
} /* end of ix loop */
if (nc < 0) {
fprintf(stderr,"bad loop in decrunchrun8, nc=%d, iy=%d, in= %d\n",nc,iy,in);
return -1; }
i=(r1+7)/8; r1=8*i; } /* end of iy loop */
return 1;
} /* end of routine */
/*--------------------------------------------------------------------------*/