static OFF_T last_match;
-/**
- * Transmit a literal and/or match token.
+/* Transmit a literal and/or match token.
*
* This delightfully-named function is called either when we find a
* match and need to transmit all the unmatched data leading up to it,
* transmit it. As a result of this second case, it is called even if
* we have not matched at all!
*
- * @param i If >0, the number of a matched token. If 0, indicates we
- * have only literal data.
- **/
+ * If i >= 0, the number of a matched token. If < 0, indicates we have
+ * only literal data. A -1 will send a 0-token-int too, and a -2 sends
+ * only literal data, w/o any token-int. */
static void matched(int f, struct sum_struct *s, struct map_struct *buf,
OFF_T offset, int32 i)
{
static void hash_search(int f,struct sum_struct *s,
struct map_struct *buf, OFF_T len)
{
- OFF_T offset, end;
+ OFF_T offset, aligned_offset, end;
int32 k, want_i, backup;
char sum2[SUM_LENGTH];
uint32 s1, s2, sum;
if (DEBUG_GTE(DELTASUM, 3))
rprintf(FINFO, "sum=%.8x k=%ld\n", sum, (long)k);
- offset = 0;
+ offset = aligned_offset = 0;
end = len + 1 - s->sums[s->count-1].len;
/* When updating in-place, the best possible match is
* one with an identical offset, so we prefer that over
- * the following want_i optimization. */
+ * the adjacent want_i optimization. */
if (updating_basis_file) {
- int32 i2;
- for (i2 = i; i2 >= 0; i2 = s->sums[i2].chain) {
- if (s->sums[i2].offset != offset)
- continue;
- if (i2 != i) {
- if (sum != s->sums[i2].sum1)
- break;
- if (memcmp(sum2, s->sums[i2].sum2,
- s->s2length) != 0)
- break;
- i = i2;
+ /* All the generator's chunks start at blength boundaries. */
+ while (aligned_offset < offset)
+ aligned_offset += s->blength;
+ if (offset == aligned_offset) {
+ int32 i2;
+ for (i2 = i; i2 >= 0; i2 = s->sums[i2].chain) {
+ if (s->sums[i2].offset != offset)
+ continue;
+ if (i2 != i) {
+ if (sum != s->sums[i2].sum1
+ || l != s->sums[i2].len
+ || memcmp(sum2, s->sums[i2].sum2, s->s2length) != 0)
+ break;
+ i = i2;
+ }
+ /* This chunk remained in the same spot in the old and new file. */
+ s->sums[i].flags |= SUMFLG_SAME_OFFSET;
+ want_i = i;
+ break;
}
- /* This chunk was at the same offset on
- * both the sender and the receiver. */
- s->sums[i].flags |= SUMFLG_SAME_OFFSET;
- goto set_want_i;
}
}
* will be happy */
i = want_i;
}
- set_want_i:
want_i = i + 1;
matched(f,s,buf,offset,i);