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https://github.com/emmanuel-marty/lzsa.git
synced 2024-11-21 14:31:01 +00:00
Compress a little faster again
This commit is contained in:
Emmanuel Marty
GitHub
parent
f665e8307d
commit
c6a93601cf
@ -186,66 +186,68 @@ static inline int lzsa_write_match_varlen_v2(unsigned char *pOutData, int nOutOf
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* @param nDepth current insertion depth
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*/
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static void lzsa_insert_forward_match_v2(lzsa_compressor *pCompressor, const unsigned char *pInWindow, const int i, const int nMatchOffset, const int nStartOffset, const int nEndOffset, int nDepth) {
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lzsa_arrival *arrival = pCompressor->arrival + ((i - nStartOffset) << ARRIVALS_PER_POSITION_SHIFT);
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const lzsa_arrival *arrival = pCompressor->arrival + ((i - nStartOffset) << ARRIVALS_PER_POSITION_SHIFT);
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const int *rle_len = (int*)pCompressor->intervals /* reuse */;
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lzsa_match* visited = ((lzsa_match*)pCompressor->pos_data) - nStartOffset /* reuse */;
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int j;
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for (j = 0; j < NARRIVALS_PER_POSITION_V2_BIG && arrival[j].from_slot; j++) {
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int nRepOffset = arrival[j].rep_offset;
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const int nRepOffset = arrival[j].rep_offset;
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if (nMatchOffset != nRepOffset && nRepOffset && arrival[j].rep_len >= MIN_MATCH_SIZE_V2) {
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int nRepPos = arrival[j].rep_pos;
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int nRepLen = arrival[j].rep_len;
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const int nRepPos = arrival[j].rep_pos;
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const int nRepLen = arrival[j].rep_len;
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if (nRepPos > nMatchOffset &&
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(nRepPos + nRepLen) <= nEndOffset &&
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pCompressor->match[((nRepPos - nStartOffset) << MATCHES_PER_INDEX_SHIFT_V2) + NMATCHES_PER_INDEX_V2 - 1].length == 0) {
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(nRepPos + nRepLen) <= nEndOffset) {
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if (visited[nRepPos].offset != nMatchOffset || visited[nRepPos].length > nRepLen) {
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visited[nRepPos].offset = nMatchOffset;
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visited[nRepPos].length = nRepLen;
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visited[nRepPos].length = 0;
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if (pInWindow[nRepPos] == pInWindow[nRepPos - nMatchOffset]) {
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int nLen0 = rle_len[nRepPos - nMatchOffset];
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int nLen1 = rle_len[nRepPos];
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int nMinLen = (nLen0 < nLen1) ? nLen0 : nLen1;
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if (pCompressor->match[((nRepPos - nStartOffset) << MATCHES_PER_INDEX_SHIFT_V2) + NMATCHES_PER_INDEX_V2 - 1].length == 0) {
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if (!memcmp(pInWindow + nRepPos, pInWindow + nRepPos - nMatchOffset, 2)) {
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const int nLen0 = rle_len[nRepPos - nMatchOffset];
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const int nLen1 = rle_len[nRepPos];
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int nMinLen = (nLen0 < nLen1) ? nLen0 : nLen1;
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if (nMinLen >= nRepLen || !memcmp(pInWindow + nRepPos + nMinLen, pInWindow + nRepPos + nMinLen - nMatchOffset, nRepLen - nMinLen)) {
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visited[nRepPos].length = 0;
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if (nMinLen >= nRepLen || !memcmp(pInWindow + nRepPos + nMinLen, pInWindow + nRepPos + nMinLen - nMatchOffset, nRepLen - nMinLen)) {
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lzsa_match* fwd_match = pCompressor->match + ((nRepPos - nStartOffset) << MATCHES_PER_INDEX_SHIFT_V2);
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int r;
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lzsa_match* fwd_match = pCompressor->match + ((nRepPos - nStartOffset) << MATCHES_PER_INDEX_SHIFT_V2);
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int r;
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for (r = 0; fwd_match[r].length; r++) {
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if (fwd_match[r].offset == nMatchOffset) {
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r = NMATCHES_PER_INDEX_V2;
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break;
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}
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}
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for (r = 0; r < NMATCHES_PER_INDEX_V2 && fwd_match[r].length >= MIN_MATCH_SIZE_V2; r++) {
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if (fwd_match[r].offset == nMatchOffset) {
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r = NMATCHES_PER_INDEX_V2;
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break;
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if (r < NMATCHES_PER_INDEX_V2) {
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int nMaxRepLen = nEndOffset - nRepPos;
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if (nMaxRepLen > LCP_MAX)
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nMaxRepLen = LCP_MAX;
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int nCurRepLen = (nMinLen > nRepLen) ? nMinLen : nRepLen;
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if (nCurRepLen > nMaxRepLen)
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nCurRepLen = nMaxRepLen;
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const unsigned char* pInWindowMax = pInWindow + nRepPos + nMaxRepLen;
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const unsigned char* pInWindowAtRepPos = pInWindow + nRepPos + nCurRepLen;
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while ((pInWindowAtRepPos + 8) < pInWindowMax && !memcmp(pInWindowAtRepPos, pInWindowAtRepPos - nMatchOffset, 8))
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pInWindowAtRepPos += 8;
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while ((pInWindowAtRepPos + 4) < pInWindowMax && !memcmp(pInWindowAtRepPos, pInWindowAtRepPos - nMatchOffset, 4))
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pInWindowAtRepPos += 4;
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while (pInWindowAtRepPos < pInWindowMax && pInWindowAtRepPos[0] == pInWindowAtRepPos[-nMatchOffset])
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pInWindowAtRepPos++;
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nCurRepLen = (int)(pInWindowAtRepPos - (pInWindow + nRepPos));
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fwd_match[r].offset = nMatchOffset;
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fwd_match[r].length = nCurRepLen;
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if (nDepth < 9)
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lzsa_insert_forward_match_v2(pCompressor, pInWindow, nRepPos, nMatchOffset, nStartOffset, nEndOffset, nDepth + 1);
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}
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}
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if (r < NMATCHES_PER_INDEX_V2) {
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int nMaxRepLen = nEndOffset - nRepPos;
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if (nMaxRepLen > LCP_MAX)
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nMaxRepLen = LCP_MAX;
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int nCurRepLen = (nMinLen > nRepLen) ? nMinLen : nRepLen;
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if (nCurRepLen > nMaxRepLen)
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nCurRepLen = nMaxRepLen;
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const unsigned char* pInWindowMax = pInWindow + nRepPos + nMaxRepLen;
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const unsigned char* pInWindowAtRepPos = pInWindow + nRepPos + nCurRepLen;
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while ((pInWindowAtRepPos + 8) < pInWindowMax && !memcmp(pInWindowAtRepPos, pInWindowAtRepPos - nMatchOffset, 8))
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pInWindowAtRepPos += 8;
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while ((pInWindowAtRepPos + 4) < pInWindowMax && !memcmp(pInWindowAtRepPos, pInWindowAtRepPos - nMatchOffset, 4))
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pInWindowAtRepPos += 4;
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while (pInWindowAtRepPos < pInWindowMax && pInWindowAtRepPos[0] == pInWindowAtRepPos[-nMatchOffset])
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pInWindowAtRepPos++;
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nCurRepLen = (int)(pInWindowAtRepPos - (pInWindow + nRepPos));
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fwd_match[r].offset = nMatchOffset;
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fwd_match[r].length = nCurRepLen;
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if (nDepth < 9)
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lzsa_insert_forward_match_v2(pCompressor, pInWindow, nRepPos, nMatchOffset, nStartOffset, nEndOffset, nDepth + 1);
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else {
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visited[nRepPos].length = nRepLen;
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}
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}
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}
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@ -296,6 +298,7 @@ static void lzsa_optimize_forward_v2(lzsa_compressor *pCompressor, const unsigne
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for (i = nStartOffset; i != nEndOffset; i++) {
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lzsa_arrival *cur_arrival = &arrival[i << ARRIVALS_PER_POSITION_SHIFT];
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lzsa_arrival *pDestLiteralSlots = &cur_arrival[1 << ARRIVALS_PER_POSITION_SHIFT];
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int m;
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for (j = 0; j < nArrivalsPerPosition && cur_arrival[j].from_slot; j++) {
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@ -317,16 +320,15 @@ static void lzsa_optimize_forward_v2(lzsa_compressor *pCompressor, const unsigne
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if (nNumLiterals == 1)
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nCodingChoiceCost += nModeSwitchPenalty;
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lzsa_arrival *pDestSlots = &cur_arrival[1 << ARRIVALS_PER_POSITION_SHIFT];
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if (nCodingChoiceCost < pDestSlots[nArrivalsPerPosition - 1].cost ||
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(nCodingChoiceCost == pDestSlots[nArrivalsPerPosition - 1].cost && nScore < (pDestSlots[nArrivalsPerPosition - 1].score + nDisableScore))) {
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if (nCodingChoiceCost < pDestLiteralSlots[nArrivalsPerPosition - 1].cost ||
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(nCodingChoiceCost == pDestLiteralSlots[nArrivalsPerPosition - 1].cost && nScore < (pDestLiteralSlots[nArrivalsPerPosition - 1].score + nDisableScore))) {
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int nRepOffset = cur_arrival[j].rep_offset;
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int exists = 0;
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for (n = 0;
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n < nArrivalsPerPosition && pDestSlots[n].cost < nCodingChoiceCost;
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n < nArrivalsPerPosition && pDestLiteralSlots[n].cost < nCodingChoiceCost;
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n++) {
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if (pDestSlots[n].rep_offset == nRepOffset) {
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if (pDestLiteralSlots[n].rep_offset == nRepOffset) {
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exists = 1;
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break;
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}
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@ -334,9 +336,9 @@ static void lzsa_optimize_forward_v2(lzsa_compressor *pCompressor, const unsigne
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if (!exists) {
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for (;
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n < nArrivalsPerPosition && pDestSlots[n].cost == nCodingChoiceCost && nScore >= (pDestSlots[n].score + nDisableScore);
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n < nArrivalsPerPosition && pDestLiteralSlots[n].cost == nCodingChoiceCost && nScore >= (pDestLiteralSlots[n].score + nDisableScore);
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n++) {
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if (pDestSlots[n].rep_offset == nRepOffset) {
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if (pDestLiteralSlots[n].rep_offset == nRepOffset) {
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exists = 1;
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break;
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}
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@ -347,9 +349,9 @@ static void lzsa_optimize_forward_v2(lzsa_compressor *pCompressor, const unsigne
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int nn;
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for (nn = n;
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nn < nArrivalsPerPosition && pDestSlots[nn].cost == nCodingChoiceCost;
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nn < nArrivalsPerPosition && pDestLiteralSlots[nn].cost == nCodingChoiceCost;
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nn++) {
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if (pDestSlots[nn].rep_offset == nRepOffset) {
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if (pDestLiteralSlots[nn].rep_offset == nRepOffset) {
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exists = 1;
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break;
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}
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@ -358,16 +360,16 @@ static void lzsa_optimize_forward_v2(lzsa_compressor *pCompressor, const unsigne
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if (!exists) {
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int z;
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for (z = n; z < nArrivalsPerPosition - 1 && pDestSlots[z].from_slot; z++) {
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if (pDestSlots[z].rep_offset == nRepOffset)
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for (z = n; z < nArrivalsPerPosition - 1 && pDestLiteralSlots[z].from_slot; z++) {
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if (pDestLiteralSlots[z].rep_offset == nRepOffset)
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break;
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}
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memmove(&pDestSlots[n + 1],
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&pDestSlots[n],
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memmove(&pDestLiteralSlots[n + 1],
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&pDestLiteralSlots[n],
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sizeof(lzsa_arrival) * (z - n));
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lzsa_arrival* pDestArrival = &pDestSlots[n];
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lzsa_arrival* pDestArrival = &pDestLiteralSlots[n];
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pDestArrival->cost = nCodingChoiceCost;
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pDestArrival->from_pos = i;
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pDestArrival->from_slot = j + 1;
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@ -385,7 +387,8 @@ static void lzsa_optimize_forward_v2(lzsa_compressor *pCompressor, const unsigne
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}
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lzsa_match *match = pCompressor->match + ((i - nStartOffset) << MATCHES_PER_INDEX_SHIFT_V2);
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int nNumArrivalsForThisPos = j, nMinOverallRepLen = 0, nMaxOverallRepLen = 0;
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const int nNumArrivalsForThisPos = j;
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int nMinOverallRepLen = 0, nMaxOverallRepLen = 0;
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int nRepMatchArrivalIdxAndLen[(NARRIVALS_PER_POSITION_V2_BIG * 2) + 1];
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int nNumRepMatchArrivals = 0;
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@ -397,15 +400,15 @@ static void lzsa_optimize_forward_v2(lzsa_compressor *pCompressor, const unsigne
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const unsigned char* pInWindowMax = pInWindowStart + nMaxRepLenForPos;
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for (j = 0; j < nNumArrivalsForThisPos && (i + MIN_MATCH_SIZE_V2) <= nEndOffset; j++) {
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int nRepOffset = cur_arrival[j].rep_offset;
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const int nRepOffset = cur_arrival[j].rep_offset;
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if (nRepOffset) {
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if (i > nRepOffset) {
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if (pInWindow[i] == pInWindow[i - nRepOffset]) {
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if (i >= nRepOffset) {
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if (!memcmp(pInWindow + i, pInWindow + i - nRepOffset, MIN_MATCH_SIZE_V2)) {
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const unsigned char* pInWindowAtPos;
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int nLen0 = rle_len[i - nRepOffset];
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int nLen1 = rle_len[i];
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const int nLen0 = rle_len[i - nRepOffset];
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const int nLen1 = rle_len[i];
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int nMinLen = (nLen0 < nLen1) ? nLen0 : nLen1;
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if (nMinLen > nMaxRepLenForPos)
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@ -420,12 +423,10 @@ static void lzsa_optimize_forward_v2(lzsa_compressor *pCompressor, const unsigne
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pInWindowAtPos++;
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int nCurRepLen = (int)(pInWindowAtPos - pInWindowStart);
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if (nCurRepLen >= MIN_MATCH_SIZE_V2) {
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if (nMaxOverallRepLen < nCurRepLen)
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nMaxOverallRepLen = nCurRepLen;
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nRepMatchArrivalIdxAndLen[nNumRepMatchArrivals++] = j;
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nRepMatchArrivalIdxAndLen[nNumRepMatchArrivals++] = nCurRepLen;
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}
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if (nMaxOverallRepLen < nCurRepLen)
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nMaxOverallRepLen = nCurRepLen;
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nRepMatchArrivalIdxAndLen[nNumRepMatchArrivals++] = j;
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nRepMatchArrivalIdxAndLen[nNumRepMatchArrivals++] = nCurRepLen;
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}
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}
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}
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@ -455,6 +456,12 @@ static void lzsa_optimize_forward_v2(lzsa_compressor *pCompressor, const unsigne
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int nRepOffset = cur_arrival[j].rep_offset;
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if (nMatchOffset != nRepOffset) {
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const int nPrevCost = cur_arrival[j].cost & 0x3fffffff;
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nNoRepmatchOffsetCost += nPrevCost /* the actual cost of the literals themselves accumulates up the chain */;
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if (!cur_arrival[j].num_literals)
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nNoRepmatchOffsetCost += nModeSwitchPenalty;
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nNonRepMatchArrivalIdx = j;
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break;
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}
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@ -488,11 +495,7 @@ static void lzsa_optimize_forward_v2(lzsa_compressor *pCompressor, const unsigne
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/* Insert non-repmatch candidate */
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if (nNonRepMatchArrivalIdx >= 0) {
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const int nPrevCost = cur_arrival[nNonRepMatchArrivalIdx].cost & 0x3fffffff;
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int nCodingChoiceCost = nPrevCost /* the actual cost of the literals themselves accumulates up the chain */ + nMatchLenCost + nNoRepmatchOffsetCost;
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if (!cur_arrival[nNonRepMatchArrivalIdx].num_literals)
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nCodingChoiceCost += nModeSwitchPenalty;
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int nCodingChoiceCost = nMatchLenCost + nNoRepmatchOffsetCost;
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int nScore = cur_arrival[nNonRepMatchArrivalIdx].score + nScorePenalty;
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if (nCodingChoiceCost < pDestSlots[nArrivalsPerPosition - 2].cost ||
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@ -1369,6 +1372,10 @@ int lzsa_optimize_and_write_block_v2(lzsa_compressor *pCompressor, const unsigne
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if (match[0].length < 5) {
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int m = 0;
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int nMatchPos;
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int nMaxForwardPos = nPosition + 2 + 1 + 2;
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if (nMaxForwardPos > (nEndOffset - 2))
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nMaxForwardPos = nEndOffset - 2;
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while (m < 46 && match[m].length) {
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offset_cache[match[m].offset & 2047] = nPosition;
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@ -1394,26 +1401,29 @@ int lzsa_optimize_and_write_block_v2(lzsa_compressor *pCompressor, const unsigne
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if (!nAlreadyExists) {
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int nForwardPos = nPosition + 2;
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int nGotMatch = 0;
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while (nForwardPos >= nMatchOffset && (nForwardPos + 2) < nEndOffset && nForwardPos < (nPosition + 2 + 1 + 2)) {
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if (!memcmp(pInWindow + nForwardPos, pInWindow + nForwardPos - nMatchOffset, 2)) {
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nGotMatch = 1;
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if (nForwardPos >= nMatchOffset) {
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int nGotMatch = 0;
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while (nForwardPos < nMaxForwardPos) {
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if (!memcmp(pInWindow + nForwardPos, pInWindow + nForwardPos - nMatchOffset, 2)) {
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nGotMatch = 1;
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break;
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}
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nForwardPos++;
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}
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if (nGotMatch) {
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int nMatchLen = 2;
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while (nMatchLen < 16 && nPosition < (nEndOffset - nMatchLen) && pInWindow[nMatchPos + nMatchLen] == pInWindow[nPosition + nMatchLen])
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nMatchLen++;
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match[m].length = nMatchLen | 0x8000;
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match[m].offset = nMatchOffset;
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m++;
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lzsa_insert_forward_match_v2(pCompressor, pInWindow, nPosition, nMatchOffset, nPreviousBlockSize, nEndOffset, 8);
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break;
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}
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nForwardPos++;
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}
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if (nGotMatch) {
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int nMatchLen = 2;
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while (nMatchLen < 16 && nPosition < (nEndOffset - nMatchLen) && pInWindow[nMatchPos + nMatchLen] == pInWindow[nPosition + nMatchLen])
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nMatchLen++;
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match[m].length = nMatchLen | 0x8000;
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match[m].offset = nMatchOffset;
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m++;
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lzsa_insert_forward_match_v2(pCompressor, pInWindow, nPosition, nMatchOffset, nPreviousBlockSize, nEndOffset, 8);
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break;
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}
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}
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}
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