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/***
* CopyPolicy: GNU Public License 2 applies
* Copyright (C) by Monty (xiphmont@mit.edu)
*
* Gapa analysis support code for paranoia
*
***/
#include "p_block.h"
#include "cdda_paranoia.h"
#include "gap.h"
/**** Gap analysis code ***************************************************/
long i_paranoia_overlap(size16 *buffA,size16 *buffB,
long offsetA, long offsetB,
long sizeA,long sizeB,
long *ret_begin, long *ret_end){
long beginA=offsetA,endA=offsetA;
long beginB=offsetB,endB=offsetB;
for(;beginA>=0 && beginB>=0;beginA--,beginB--)
if(buffA[beginA]!=buffB[beginB])break;
beginA++;
beginB++;
for(;endA<sizeA && endB<sizeB;endA++,endB++)
if(buffA[endA]!=buffB[endB])break;
if(ret_begin)*ret_begin=beginA;
if(ret_end)*ret_end=endA;
return(endA-beginA);
}
long i_paranoia_overlap2(size16 *buffA,size16 *buffB,
char *flagsA,char *flagsB,
long offsetA, long offsetB,
long sizeA,long sizeB,
long *ret_begin, long *ret_end){
long beginA=offsetA,endA=offsetA;
long beginB=offsetB,endB=offsetB;
for(;beginA>=0 && beginB>=0;beginA--,beginB--){
if(buffA[beginA]!=buffB[beginB])break;
/* don't allow matching across matching sector boundaries */
/* don't allow matching through known missing data */
if(flagsA[beginA]&flagsB[beginB]&1){
beginA--;
beginB--;
break;
}
if((flagsA[beginA]|flagsB[beginB])&2)break;
}
beginA++;
beginB++;
for(;endA<sizeA && endB<sizeB;endA++,endB++){
if(buffA[endA]!=buffB[endB])break;
/* don't allow matching across matching sector boundaries */
if((flagsA[endA]&flagsB[endB]&1)&&endA!=beginA){
break;
}
/* don't allow matching through known missing data */
if((flagsA[endA]|flagsB[endB])&2)break;
}
if(ret_begin)*ret_begin=beginA;
if(ret_end)*ret_end=endA;
return(endA-beginA);
}
long i_paranoia_overlap_r(size16 *buffA,size16 *buffB,
long offsetA, long offsetB){
long beginA=offsetA;
long beginB=offsetB;
for(;beginA>=0 && beginB>=0;beginA--,beginB--)
if(buffA[beginA]!=buffB[beginB])break;
beginA++;
beginB++;
return(offsetA-beginA);
}
long i_paranoia_overlap_f(size16 *buffA,size16 *buffB,
long offsetA, long offsetB,
long sizeA,long sizeB){
long endA=offsetA;
long endB=offsetB;
for(;endA<sizeA && endB<sizeB;endA++,endB++)
if(buffA[endA]!=buffB[endB])break;
return(endA-offsetA);
}
int i_stutter_or_gap(size16 *A, size16 *B,long offA, long offB,
long gap){
long a1=offA;
long b1=offB;
if(a1<0){
b1-=a1;
gap+=a1;
a1=0;
}
return(memcmp(A+a1,B+b1,gap*2));
}
/* riftv is the first value into the rift -> or <- */
void i_analyze_rift_f(size16 *A,size16 *B,
long sizeA, long sizeB,
long aoffset, long boffset,
long *matchA,long *matchB,long *matchC){
long apast=sizeA-aoffset;
long bpast=sizeB-boffset;
long i;
*matchA=0, *matchB=0, *matchC=0;
/* Look for three possible matches... (A) Ariftv->B, (B) Briftv->A and
(c) AB->AB. */
for(i=0;;i++){
if(i<bpast) /* A */
if(i_paranoia_overlap_f(A,B,aoffset,boffset+i,sizeA,sizeB)>=MIN_WORDS_RIFT){
*matchA=i;
break;
}
if(i<apast){ /* B */
if(i_paranoia_overlap_f(A,B,aoffset+i,boffset,sizeA,sizeB)>=MIN_WORDS_RIFT){
*matchB=i;
break;
}
if(i<bpast) /* C */
if(i_paranoia_overlap_f(A,B,aoffset+i,boffset+i,sizeA,sizeB)>=MIN_WORDS_RIFT){
*matchC=i;
break;
}
}else
if(i>=bpast)break;
}
if(*matchA==0 && *matchB==0 && *matchC==0)return;
if(*matchC)return;
if(*matchA){
if(i_stutter_or_gap(A,B,aoffset-*matchA,boffset,*matchA))
return;
*matchB=-*matchA; /* signify we need to remove n bytes from B */
*matchA=0;
return;
}else{
if(i_stutter_or_gap(B,A,boffset-*matchB,aoffset,*matchB))
return;
*matchA=-*matchB;
*matchB=0;
return;
}
}
/* riftv must be first even val of rift moving back */
void i_analyze_rift_r(size16 *A,size16 *B,
long sizeA, long sizeB,
long aoffset, long boffset,
long *matchA,long *matchB,long *matchC){
long apast=aoffset+1;
long bpast=boffset+1;
long i;
*matchA=0, *matchB=0, *matchC=0;
/* Look for three possible matches... (A) Ariftv->B, (B) Briftv->A and
(c) AB->AB. */
for(i=0;;i++){
if(i<bpast) /* A */
if(i_paranoia_overlap_r(A,B,aoffset,boffset-i)>=MIN_WORDS_RIFT){
*matchA=i;
break;
}
if(i<apast){ /* B */
if(i_paranoia_overlap_r(A,B,aoffset-i,boffset)>=MIN_WORDS_RIFT){
*matchB=i;
break;
}
if(i<bpast) /* C */
if(i_paranoia_overlap_r(A,B,aoffset-i,boffset-i)>=MIN_WORDS_RIFT){
*matchC=i;
break;
}
}else
if(i>=bpast)break;
}
if(*matchA==0 && *matchB==0 && *matchC==0)return;
if(*matchC)return;
if(*matchA){
if(i_stutter_or_gap(A,B,aoffset+1,boffset-*matchA+1,*matchA))
return;
*matchB=-*matchA; /* signify we need to remove n bytes from B */
*matchA=0;
return;
}else{
if(i_stutter_or_gap(B,A,boffset+1,aoffset-*matchB+1,*matchB))
return;
*matchA=-*matchB;
*matchB=0;
return;
}
}
#ifdef TEST
#include <stdio.h>
int main(){
{
size16 buffA[20]={-1,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18};
size16 buffB[20]={1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20};
size16 buffC[20]={0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19};
char flags1[20]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
char flags2[20]={0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
char flags3[20]={0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
char flags4[20]={0,0,0,0,2,2,2,0,0,0,0,0,0,0,0,0,0,0,0,0};
long begin,end,ret;
/* no match */
ret=i_paranoia_overlap2(buffA,buffB,flags1,flags1,0,0,20,20,&begin,&end);
if(ret!=-1 || begin!=1 || end!=0){
printf("i_paranoia_overlap2: failed test 1 ret:%ld begin:%ld end:%ld\n",
ret,begin,end);
return(1);
}
/* full match offset 2 */
ret=i_paranoia_overlap2(buffA,buffB,flags1,flags1,2,0,20,20,&begin,&end);
if(ret!=18 || begin!=2 || end!=20){
printf("i_paranoia_overlap2: failed test 2 ret:%ld begin:%ld end:%ld\n",
ret,begin,end);
return(1);
}
/* full match offset 1 */
ret=i_paranoia_overlap2(buffA,buffC,flags1,flags1,1,0,20,20,&begin,&end);
if(ret!=19 || begin!=1 || end!=20){
printf("i_paranoia_overlap2: failed test 3 ret:%ld begin:%ld end:%ld\n",
ret,begin,end);
return(1);
}
/* bound match */
ret=i_paranoia_overlap2(buffA,buffC,flags2,flags3,11,10,20,20,&begin,&end);
if(ret!=15 || begin!=5 || end!=20){
printf("i_paranoia_overlap2: failed test 4 ret:%ld begin:%ld end:%ld\n",
ret,begin,end);
return(1);
}
/* unmatchable data */
ret=i_paranoia_overlap2(buffA,buffC,flags1,flags4,11,10,20,20,&begin,&end);
if(ret!=12 || begin!=8 || end!=20){
printf("i_paranoia_overlap2: failed test 5 ret:%ld begin:%ld end:%ld\n",
ret,begin,end);
return(1);
}
/* unmatchable data */
begin=-1;
end=-1;
ret=i_paranoia_overlap2(buffA,buffC,flags1,flags4,5,4,20,20,&begin,&end);
if(ret!=-1 || begin!=6 || end!=5){
printf("i_paranoia_overlap2: failed test 6 ret:%ld begin:%ld end:%ld\n",
ret,begin,end);
return(1);
}
}
{
size16 A[40]={0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,
20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39};
size16 B[40]={-2,-1,0,1,2,3,4,5,6,7,8,9,11,12,13,14,15,16,17,18,19,
20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38};
size16 C[42]={-2,-1,0,1,2,3,4,5,6,7,8,9,10,10,11,12,13,14,15,16,17,18,19,
20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38};
size16 D[40]={0,1,2,3,4,5,6,7,8,9,100,110,120,13,14,15,16,17,18,19,
20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39};
long matchA,matchB,matchC;
i_analyze_rift_f(A,B,40,40,10,12,&matchA,&matchB,&matchC);
if(matchB!=1){
printf("i_analyze_rift_f: failed test1 matchA:%ld matchB:%ld "
"matchC:%ld\n",matchA,matchB,matchC);
exit(1);
}
i_analyze_rift_f(B,A,40,40,12,10,&matchA,&matchB,&matchC);
if(matchA!=1){
printf("i_analyze_rift_f: failed test2 matchA:%ld matchB:%ld "
"matchC:%ld\n",matchA,matchB,matchC);
exit(1);
}
i_analyze_rift_f(A,C,40,42,11,13,&matchA,&matchB,&matchC);
if(matchB!=-1){
printf("i_analyze_rift_f: failed test3 matchA:%ld matchB:%ld "
"matchC:%ld\n",matchA,matchB,matchC);
exit(1);
}
i_analyze_rift_f(C,A,42,40,13,11,&matchA,&matchB,&matchC);
if(matchA!=-1){
printf("i_analyze_rift_f: failed test4 matchA:%ld matchB:%ld "
"matchC:%ld\n",matchA,matchB,matchC);
exit(1);
}
i_analyze_rift_f(A,D,40,40,10,10,&matchA,&matchB,&matchC);
if(matchC!=3){
printf("i_analyze_rift_f: failed test5 matchA:%ld matchB:%ld "
"matchC:%ld\n",matchA,matchB,matchC);
exit(1);
}
i_analyze_rift_f(D,A,40,40,10,10,&matchA,&matchB,&matchC);
if(matchC!=3){
printf("i_analyze_rift_f: failed test6 matchA:%ld matchB:%ld "
"matchC:%ld\n",matchA,matchB,matchC);
exit(1);
}
}
{
size16 A[40]={0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,
20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39};
size16 B[40]={-1,-2,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,
20,21,22,23,24,25,26,27,28,29,30,31,32,33,35,36,37,38};
size16 C[40]={0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,
20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,34,35,36,37,38};
size16 D[40]={0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,
20,21,22,23,24,25,26,27,28,29,3,3,3,33,34,35,36,37,38,39};
long matchA,matchB,matchC;
i_analyze_rift_r(A,B,40,40,34,35,&matchA,&matchB,&matchC);
if(matchB!=1){
printf("i_analyze_rift_r: failed test1 matchA:%ld matchB:%ld "
"matchC:%ld\n",matchA,matchB,matchC);
exit(1);
}
i_analyze_rift_r(B,A,40,40,35,34,&matchA,&matchB,&matchC);
if(matchA!=1){
printf("i_analyze_rift_r: failed test2 matchA:%ld matchB:%ld "
"matchC:%ld\n",matchA,matchB,matchC);
exit(1);
}
i_analyze_rift_r(A,C,40,40,33,34,&matchA,&matchB,&matchC);
if(matchB!=-1){
printf("i_analyze_rift_r: failed test3 matchA:%ld matchB:%ld "
"matchC:%ld\n",matchA,matchB,matchC);
exit(1);
}
i_analyze_rift_r(C,A,40,40,34,33,&matchA,&matchB,&matchC);
if(matchA!=-1){
printf("i_analyze_rift_r: failed test4 matchA:%ld matchB:%ld "
"matchC:%ld\n",matchA,matchB,matchC);
exit(1);
}
i_analyze_rift_r(A,D,40,40,32,32,&matchA,&matchB,&matchC);
if(matchC!=3){
printf("i_analyze_rift_r: failed test5 matchA:%ld matchB:%ld "
"matchC:%ld\n",matchA,matchB,matchC);
exit(1);
}
i_analyze_rift_r(D,A,40,40,32,32,&matchA,&matchB,&matchC);
if(matchC!=3){
printf("i_analyze_rift_r: failed test6 matchA:%ld matchB:%ld "
"matchC:%ld\n",matchA,matchB,matchC);
exit(1);
}
}
return(0);
}
#endif
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