static OFF_T last_match;
+/**
+ * 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,
+ * or when we get bored of accumulating literal data and just need to
+ * 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.
+ **/
static void matched(int f,struct sum_struct *s,struct map_struct *buf,
OFF_T offset,int i)
{
match. The 3 reads are caused by the
running match, the checksum update and the
literal send. */
- if (offset-last_match >= CHUNK_SIZE+s->n &&
+ if (offset > last_match &&
+ offset-last_match >= CHUNK_SIZE+s->n &&
(end-offset > CHUNK_SIZE)) {
matched(f,s,buf,offset - s->n, -2);
}
}
-void match_sums(int f,struct sum_struct *s,struct map_struct *buf,OFF_T len)
+/**
+ * Scan through a origin file, looking for sections that match
+ * checksums from the generator, and transmit either literal or token
+ * data.
+ *
+ * Also calculates the MD4 checksum of the whole file, using the md
+ * accumulator. This is transmitted with the file as protection
+ * against corruption on the wire.
+ *
+ * @param s Checksums received from the generator. If <tt>s->count ==
+ * 0</tt>, then there are actually no checksums for this file.
+ *
+ * @param len Length of the file to send.
+ **/
+void match_sums(int f, struct sum_struct *s, struct map_struct *buf, OFF_T len)
{
char file_sum[MD4_SUM_LENGTH];
extern int write_batch; /* dw */