do not fail digest computation that often

1 files changed, 3 insertions, 1 deletions

diff --git a/fuzzy.c b/fuzzy.c
index 19ba00b..c82d3c1 100644
--- a/fuzzy.c
+++ b/fuzzy.c
@@ -222,11 +222,13 @@ int fuzzy_digest(const struct fuzzy_state *self, /*@out@*/ char *result) {
 	/* Initial blocksize guess. */
 	while((size_t)SSDEEP_BS(bi) * SPAMSUM_LENGTH < self->total_size) {
 		++bi;
-		if(bi >= self->bhend)
+		if(bi >= SSDEEP_BS(NUM_BLOCKHASHES))
 			/* The input exceeds data types. */
 			return -1;
 	}
 	/* Adapt blocksize guess to actual digest length. */
+	while(bi >= self->bhend)
+		--bi;
 	while(bi > self->bhstart && self->bh[bi].dlen < SPAMSUM_LENGTH / 2)
 		--bi;
 	assert(!(bi > 0 && self->bh[bi].dlen < SPAMSUM_LENGTH / 2));