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/*
* This file has been modified for the cdrkit suite.
*
* The behaviour and appearence of the program code below can differ to a major
* extent from the version distributed by the original author(s).
*
* For details, see Changelog file distributed with the cdrkit package. If you
* received this file from another source then ask the distributing person for
* a log of modifications.
*
*/
/* @(#)gap.c 1.12 04/02/18 J. Schilling from cdparanoia-III-alpha9.8 */
/*
* Modifications to make the code portable Copyright (c) 2002 J. Schilling
*/
/*
* CopyPolicy: GNU Public License 2 applies
* Copyright (C) by Monty (xiphmont@mit.edu)
*
* Gapa analysis support code for paranoia
*
*/
#include <mconfig.h>
#include <standard.h>
#include <utypes.h>
#include <strdefs.h>
#include "p_block.h"
#include "cdda_paranoia.h"
#include "gap.h"
long i_paranoia_overlap_r(Int16_t * buffA, Int16_t * buffB, long offsetA,
long offsetB);
long i_paranoia_overlap_f(Int16_t * buffA, Int16_t * buffB, long offsetA,
long offsetB, long sizeA, long sizeB);
int i_stutter_or_gap(Int16_t * A, Int16_t * B, long offA, long offB, long gap);
void i_analyze_rift_f(Int16_t * A, Int16_t * B,
long sizeA, long sizeB,
long aoffset, long boffset,
long *matchA, long *matchB, long *matchC);
void i_analyze_rift_r(Int16_t * A, Int16_t * B,
long sizeA, long sizeB,
long aoffset, long boffset,
long *matchA, long *matchB, long *matchC);
void analyze_rift_silence_f(Int16_t * A, Int16_t * B,
long sizeA, long sizeB,
long aoffset, long boffset,
long *matchA, long *matchB);
/*
* Gap analysis code
*/
long i_paranoia_overlap_r(Int16_t *buffA, Int16_t *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(Int16_t *buffA, Int16_t *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(Int16_t *A, Int16_t *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(Int16_t *A, Int16_t *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(Int16_t *A, Int16_t *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;
}
}
void analyze_rift_silence_f(Int16_t *A, Int16_t *B, long sizeA, long sizeB,
long aoffset, long boffset, long *matchA,
long *matchB)
{
*matchA = -1;
*matchB = -1;
sizeA = min(sizeA, aoffset + MIN_WORDS_RIFT);
sizeB = min(sizeB, boffset + MIN_WORDS_RIFT);
aoffset++;
boffset++;
while (aoffset < sizeA) {
if (A[aoffset] != A[aoffset - 1]) {
*matchA = 0;
break;
}
aoffset++;
}
while (boffset < sizeB) {
if (B[boffset] != B[boffset - 1]) {
*matchB = 0;
break;
}
boffset++;
}
}
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