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Fix secondary sketch computation, some more accuracy in diff detection.

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This commit is contained in:
Moinak Ghosh 2012-09-04 23:28:02 +05:30
parent 262566b59a
commit 560fa85aab
2 changed files with 4 additions and 8 deletions
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10
rabin/rabin_dedup.c
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@ -409,7 +409,7 @@ rabin_dedup(rabin_context_t *ctx, uchar_t *buf, ssize_t *size, ssize_t offset, s
*/
fpos[0] = fpos[(fplist[fpos[1]] > fplist[fpos[0]])];
if (len1 == SKETCH_BASIC_BLOCK_SZ) {
uint32_t p1, p2;
uint32_t p1, p2, p3;
/*
* Compute the super sketch value by summing all the representative
* fingerprints of the block.
@ -424,18 +424,16 @@ rabin_dedup(rabin_context_t *ctx, uchar_t *buf, ssize_t *size, ssize_t offset, s
*/
p1 = 0;
p2 = 0;
p3 = 0;
for (len1=0; len1<256; len1++) {
if (charcounts[len1] > p1) {
p3 = p2;
p2 = p1;
p1 = len1;
}
charcounts[len1] = 0;
}
if (ctx->delta_flag == DELTA_LESS_FUZZY) {
cur_sketch2 += ((p1 << 8) | p2);
} else {
cur_sketch2 += p2;
}
cur_sketch2 += ((p1 << 16) | (p2 << 8) | p3);
len1 = 0;
j++;
}

2
rabin/rabin_dedup.h
View file

@ -117,8 +117,6 @@
*/
#define SIMILAR_EXACT 1
#define SIMILAR_PARTIAL 2
#define DELTA_FUZZY 1
#define DELTA_LESS_FUZZY 2
/*
* Irreducible polynomial for Rabin modulus. This value is from the