Renamed sum_table -> hash_table.

[rsync/rsync.git] / match.c

diff --git a/match.c b/match.c
index 4fe23fd..19b17c5 100644 (file)
--- a/match.c
+++ b/match.c
@@ -27,21 +27,20 @@ extern int append_mode;
 int updating_basis_file;
 
 static int false_alarms;
-static int tag_hits;
+static int hash_hits;
 static int matches;
 static int64 data_transfer;
 
 static int total_false_alarms;
-static int total_tag_hits;
+static int total_hash_hits;
 static int total_matches;
 
 extern struct stats stats;
 
 static uint32 tablesize;
-static int32 *sum_table;
+static int32 *hash_table;
 
-#define gettag2(s1,s2) gettag((s1) + ((s2)<<16))
-#define gettag(sum) ((sum)%tablesize)
+#define SUM2HASH(sum) ((sum)%tablesize)
 
 static void build_hash_table(struct sum_struct *s)
 {
@@ -55,18 +54,18 @@ static void build_hash_table(struct sum_struct *s)
        if (tablesize < 65537)
                tablesize = 65537; /* a prime number */
        if (tablesize != prior_size) {
-               free(sum_table);
-               sum_table = new_array(int32, tablesize);
-               if (!sum_table)
+               free(hash_table);
+               hash_table = new_array(int32, tablesize);
+               if (!hash_table)
                        out_of_memory("build_hash_table");
        }
 
-       memset(sum_table, 0xFF, tablesize * sizeof sum_table[0]);
+       memset(hash_table, 0xFF, tablesize * sizeof hash_table[0]);
 
        for (i = 0; i < s->count; i++) {
-               uint32 t = gettag(s->sums[i].sum1);
-               s->sums[i].chain = sum_table[t];
-               sum_table[t] = i;
+               uint32 t = SUM2HASH(s->sums[i].sum1);
+               s->sums[i].chain = hash_table[t];
+               hash_table[t] = i;
        }
 }
 
@@ -161,16 +160,18 @@ static void hash_search(int f,struct sum_struct *s,
        }
 
        do {
-               uint32 t = gettag2(s1,s2);
                int done_csum2 = 0;
                int32 i;
 
                if (verbose > 4)
                        rprintf(FINFO,"offset=%.0f sum=%08x\n",(double)offset,sum);
 
-               sum = (s1 & 0xffff) | (s2 << 16);
-               tag_hits++;
-               for (i = sum_table[t]; i >= 0; i = s->sums[i].chain) {
+               i = hash_table[SUM2HASH(sum)];
+               if (i < 0)
+                       goto null_hash;
+
+               hash_hits++;
+               do {
                        int32 l;
 
                        if (sum != s->sums[i].sum1)
@@ -250,8 +251,9 @@ static void hash_search(int f,struct sum_struct *s,
                        s2 = sum >> 16;
                        matches++;
                        break;
-               }
+               } while ((i = s->sums[i].chain) >= 0);
 
+         null_hash:
                backup = offset - last_match;
                /* We sometimes read 1 byte prior to last_match... */
                if (backup < 0)
@@ -270,6 +272,7 @@ static void hash_search(int f,struct sum_struct *s,
                        s2 += s1;
                } else
                        --k;
+               sum = (s1 & 0xffff) | (s2 << 16);
 
                /* By matching early we avoid re-reading the
                   data 3 times in the case where a token
@@ -306,7 +309,7 @@ void match_sums(int f, struct sum_struct *s, struct map_struct *buf, OFF_T len)
 
        last_match = 0;
        false_alarms = 0;
-       tag_hits = 0;
+       hash_hits = 0;
        matches = 0;
        data_transfer = 0;
 
@@ -359,10 +362,10 @@ void match_sums(int f, struct sum_struct *s, struct map_struct *buf, OFF_T len)
        write_buf(f,file_sum,MD4_SUM_LENGTH);
 
        if (verbose > 2)
-               rprintf(FINFO, "false_alarms=%d tag_hits=%d matches=%d\n",
-                       false_alarms, tag_hits, matches);
+               rprintf(FINFO, "false_alarms=%d hash_hits=%d matches=%d\n",
+                       false_alarms, hash_hits, matches);
 
-       total_tag_hits += tag_hits;
+       total_hash_hits += hash_hits;
        total_false_alarms += false_alarms;
        total_matches += matches;
        stats.literal_data += data_transfer;
@@ -374,8 +377,7 @@ void match_report(void)
                return;
 
        rprintf(FINFO,
-               "total: matches=%d  tag_hits=%d  false_alarms=%d data=%.0f\n",
-               total_matches,total_tag_hits,
-               total_false_alarms,
+               "total: matches=%d  hash_hits=%d  false_alarms=%d data=%.0f\n",
+               total_matches, total_hash_hits, total_false_alarms,
                (double)stats.literal_data);
 }