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liblzma: Use lzma_memcmplen() in the match finders.
This doesn't change the match finder output.
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e1c8f1d01f
commit
5db75054e9
2 changed files with 23 additions and 23 deletions
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@ -20,6 +20,8 @@
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# include "lz_encoder_hash_table.h"
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#endif
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#include "memcmplen.h"
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struct lzma_coder_s {
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/// LZ-based encoder e.g. LZMA
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@ -363,9 +365,18 @@ lz_encoder_init(lzma_mf *mf, const lzma_allocator *allocator,
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{
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// Allocate the history buffer.
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if (mf->buffer == NULL) {
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mf->buffer = lzma_alloc(mf->size, allocator);
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// lzma_memcmplen() is used for the dictionary buffer
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// so we need to allocate a few extra bytes to prevent
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// it from reading past the end of the buffer.
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mf->buffer = lzma_alloc(mf->size + LZMA_MEMCMPLEN_EXTRA,
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allocator);
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if (mf->buffer == NULL)
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return true;
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// Keep Valgrind happy with lzma_memcmplen() and initialize
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// the extra bytes whose value may get read but which will
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// effectively get ignored.
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memzero(mf->buffer + mf->size, LZMA_MEMCMPLEN_EXTRA);
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}
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// Use cyclic_size as initial mf->offset. This allows
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@ -13,6 +13,7 @@
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#include "lz_encoder.h"
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#include "lz_encoder_hash.h"
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#include "memcmplen.h"
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/// \brief Find matches starting from the current byte
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@ -65,9 +66,7 @@ lzma_mf_find(lzma_mf *mf, uint32_t *count_ptr, lzma_match *matches)
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// here because the match distances are zero based.
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const uint8_t *p2 = p1 - matches[count - 1].dist - 1;
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while (len_best < limit
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&& p1[len_best] == p2[len_best])
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++len_best;
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len_best = lzma_memcmplen(p1, p2, len_best, limit);
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}
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}
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@ -272,10 +271,7 @@ hc_find_func(
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+ (delta > cyclic_pos ? cyclic_size : 0)];
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if (pb[len_best] == cur[len_best] && pb[0] == cur[0]) {
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uint32_t len = 0;
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while (++len != len_limit)
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if (pb[len] != cur[len])
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break;
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uint32_t len = lzma_memcmplen(pb, cur, 1, len_limit);
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if (len_best < len) {
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len_best = len;
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@ -321,9 +317,8 @@ lzma_mf_hc3_find(lzma_mf *mf, lzma_match *matches)
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uint32_t len_best = 2;
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if (delta2 < mf->cyclic_size && *(cur - delta2) == *cur) {
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for ( ; len_best != len_limit; ++len_best)
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if (*(cur + len_best - delta2) != cur[len_best])
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break;
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len_best = lzma_memcmplen(cur - delta2, cur,
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len_best, len_limit);
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matches[0].len = len_best;
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matches[0].dist = delta2 - 1;
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@ -400,9 +395,8 @@ lzma_mf_hc4_find(lzma_mf *mf, lzma_match *matches)
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}
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if (matches_count != 0) {
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for ( ; len_best != len_limit; ++len_best)
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if (*(cur + len_best - delta2) != cur[len_best])
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break;
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len_best = lzma_memcmplen(cur - delta2, cur,
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len_best, len_limit);
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matches[matches_count - 1].len = len_best;
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@ -487,9 +481,7 @@ bt_find_func(
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uint32_t len = my_min(len0, len1);
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if (pb[len] == cur[len]) {
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while (++len != len_limit)
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if (pb[len] != cur[len])
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break;
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len = lzma_memcmplen(pb, cur, len + 1, len_limit);
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if (len_best < len) {
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len_best = len;
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@ -552,9 +544,7 @@ bt_skip_func(
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uint32_t len = my_min(len0, len1);
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if (pb[len] == cur[len]) {
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while (++len != len_limit)
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if (pb[len] != cur[len])
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break;
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len = lzma_memcmplen(pb, cur, len + 1, len_limit);
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if (len == len_limit) {
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*ptr1 = pair[0];
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@ -715,9 +705,8 @@ lzma_mf_bt4_find(lzma_mf *mf, lzma_match *matches)
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}
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if (matches_count != 0) {
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for ( ; len_best != len_limit; ++len_best)
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if (*(cur + len_best - delta2) != cur[len_best])
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break;
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len_best = lzma_memcmplen(
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cur, cur - delta2, len_best, len_limit);
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matches[matches_count - 1].len = len_best;
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