-/*
+/*
Copyright (C) Andrew Tridgell 1996
Copyright (C) Paul Mackerras 1996
-
+
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
-
+
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
-
+
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#include "rsync.h"
-extern int csum_length;
-
extern int verbose;
extern int am_server;
+extern int do_progress;
+extern int checksum_seed;
typedef unsigned short tag;
#define TABLESIZE (1<<16)
-#define NULL_TAG ((tag)-1)
+#define NULL_TAG ((size_t)-1)
static int false_alarms;
static int tag_hits;
static int matches;
-static int data_transfer;
+static int64 data_transfer;
-static int total_false_alarms=0;
-static int total_tag_hits=0;
-static int total_matches=0;
-static int total_data_transfer=0;
+static int total_false_alarms;
+static int total_tag_hits;
+static int total_matches;
+extern struct stats stats;
struct target {
- tag t;
- int i;
+ tag t;
+ size_t i;
};
-static struct target *targets=NULL;
+static struct target *targets;
-static tag *tag_table = NULL;
+static size_t *tag_table;
#define gettag2(s1,s2) (((s1) + (s2)) & 0xFFFF)
#define gettag(sum) gettag2((sum)&0xFFFF,(sum)>>16)
static int compare_targets(struct target *t1,struct target *t2)
{
- return(t1->t - t2->t);
+ return (int)t1->t - (int)t2->t;
}
static void build_hash_table(struct sum_struct *s)
{
- int i;
+ size_t i;
- if (!tag_table)
- tag_table = (tag *)malloc(sizeof(tag)*TABLESIZE);
+ if (!tag_table)
+ tag_table = new_array(size_t, TABLESIZE);
- targets = (struct target *)malloc(sizeof(targets[0])*s->count);
- if (!tag_table || !targets)
- out_of_memory("build_hash_table");
+ targets = new_array(struct target, s->count);
+ if (!tag_table || !targets)
+ out_of_memory("build_hash_table");
- for (i=0;i<s->count;i++) {
- targets[i].i = i;
- targets[i].t = gettag(s->sums[i].sum1);
- }
+ for (i = 0; i < s->count; i++) {
+ targets[i].i = i;
+ targets[i].t = gettag(s->sums[i].sum1);
+ }
- qsort(targets,s->count,sizeof(targets[0]),(int (*)())compare_targets);
+ qsort(targets,s->count,sizeof(targets[0]),(int (*)())compare_targets);
- for (i=0;i<TABLESIZE;i++)
- tag_table[i] = NULL_TAG;
+ for (i = 0; i < TABLESIZE; i++)
+ tag_table[i] = NULL_TAG;
- for (i=s->count-1;i>=0;i--) {
- tag_table[targets[i].t] = i;
- }
+ for (i = s->count; i-- > 0; )
+ tag_table[targets[i].t] = i;
}
-static off_t last_match;
+static OFF_T last_match;
-static void matched(int f,struct sum_struct *s,char *buf,off_t len,
- int offset,int i)
+/**
+ * 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)
{
- int n = offset - last_match;
-
- if (verbose > 2)
- if (i != -1)
- fprintf(stderr,"match at %d last_match=%d j=%d len=%d n=%d\n",
- (int)offset,(int)last_match,i,(int)s->sums[i].len,n);
-
- if (n > 0) {
- int l = 0;
- write_int(f,n);
- while (l < n) {
- int n1 = MIN(CHUNK_SIZE,n-l);
- write_buf(f,map_ptr(buf,last_match+l,n1),n1);
- l += n1;
- }
- data_transfer += n;
- }
- write_int(f,-(i+1));
- if (i != -1)
- last_match = offset + s->sums[i].len;
- if (n > 0)
- write_flush(f);
+ OFF_T n = offset - last_match;
+ OFF_T j;
+
+ if (verbose > 2 && i >= 0)
+ rprintf(FINFO,"match at %.0f last_match=%.0f j=%d len=%u n=%.0f\n",
+ (double)offset,(double)last_match,i,s->sums[i].len,(double)n);
+
+ send_token(f,i,buf,last_match,n,i<0?0:s->sums[i].len);
+ data_transfer += n;
+
+ if (i >= 0) {
+ stats.matched_data += s->sums[i].len;
+ n += s->sums[i].len;
+ }
+
+ for (j = 0; j < n; j += CHUNK_SIZE) {
+ int n1 = MIN(CHUNK_SIZE,n-j);
+ sum_update(map_ptr(buf,last_match+j,n1),n1);
+ }
+
+
+ if (i >= 0)
+ last_match = offset + s->sums[i].len;
+ else
+ last_match = offset;
+
+ if (buf && do_progress) {
+ show_progress(last_match, buf->file_size);
+
+ if (i == -1)
+ end_progress(buf->file_size);
+ }
}
-static void hash_search(int f,struct sum_struct *s,char *buf,off_t len)
+static void hash_search(int f,struct sum_struct *s,
+ struct map_struct *buf, OFF_T len)
{
- int offset,j,k;
- int end;
- char sum2[SUM_LENGTH];
- uint32 s1, s2, sum;
- char *map;
-
- if (verbose > 2)
- fprintf(stderr,"hash search b=%d len=%d\n",s->n,(int)len);
-
- k = MIN(len, s->n);
-
- map = map_ptr(buf,0,k);
-
- sum = get_checksum1(map, k);
- s1 = sum & 0xFFFF;
- s2 = sum >> 16;
- if (verbose > 3)
- fprintf(stderr, "sum=%.8x k=%d\n", sum, k);
-
- offset = 0;
-
- end = len + 1 - s->sums[s->count-1].len;
-
- if (verbose > 3)
- fprintf(stderr,"hash search s->n=%d len=%d count=%d\n",
- s->n,(int)len,s->count);
-
- do {
- tag t = gettag2(s1,s2);
- j = tag_table[t];
- if (verbose > 4)
- fprintf(stderr,"offset=%d sum=%08x\n",
- offset,sum);
-
- if (j != NULL_TAG) {
- int done_csum2 = 0;
-
- sum = (s1 & 0xffff) | (s2 << 16);
- tag_hits++;
- do {
- int i = targets[j].i;
-
- if (sum == s->sums[i].sum1) {
- if (verbose > 3)
- fprintf(stderr,"potential match at %d target=%d %d sum=%08x\n",
- offset,j,i,sum);
-
- if (!done_csum2) {
- int l = MIN(s->n,len-offset);
- map = map_ptr(buf,offset,l);
- get_checksum2(map,l,sum2);
- done_csum2 = 1;
- }
- if (memcmp(sum2,s->sums[i].sum2,csum_length) == 0) {
- matched(f,s,buf,len,offset,i);
- offset += s->sums[i].len - 1;
- k = MIN((len-offset), s->n);
- map = map_ptr(buf,offset,k);
- sum = get_checksum1(map, k);
- s1 = sum & 0xFFFF;
- s2 = sum >> 16;
- ++matches;
- break;
- } else {
- false_alarms++;
- }
+ OFF_T offset, end;
+ unsigned int k;
+ size_t last_i;
+ char sum2[SUM_LENGTH];
+ uint32 s1, s2, sum;
+ schar *map;
+
+ /* last_i is used to encourage adjacent matches, allowing the RLL coding of the
+ output to work more efficiently */
+ last_i = (size_t)-1;
+
+ if (verbose > 2) {
+ rprintf(FINFO,"hash search b=%u len=%.0f\n",
+ s->blength, (double)len);
}
- j++;
- } while (j<s->count && targets[j].t == t);
- }
-
- /* Trim off the first byte from the checksum */
- map = map_ptr(buf,offset,k+1);
- s1 -= map[0];
- s2 -= k * map[0];
-
- /* Add on the next byte (if there is one) to the checksum */
- if (k < (len-offset)) {
- s1 += map[k];
- s2 += s1;
- } else {
- --k;
- }
-
- } while (++offset < end);
-
- matched(f,s,buf,len,len,-1);
+
+ k = MIN(len, s->blength);
+
+ map = (schar *)map_ptr(buf, 0, k);
+
+ sum = get_checksum1((char *)map, k);
+ s1 = sum & 0xFFFF;
+ s2 = sum >> 16;
+ if (verbose > 3)
+ rprintf(FINFO, "sum=%.8x k=%u\n", sum, k);
+
+ offset = 0;
+
+ end = len + 1 - s->sums[s->count-1].len;
+
+ if (verbose > 3) {
+ rprintf(FINFO, "hash search s->blength=%u len=%.0f count=%.0f\n",
+ s->blength, (double)len, (double)s->count);
+ }
+
+ do {
+ tag t = gettag2(s1,s2);
+ int done_csum2 = 0;
+ size_t j = tag_table[t];
+
+ if (verbose > 4)
+ rprintf(FINFO,"offset=%.0f sum=%08x\n",(double)offset,sum);
+
+ if (j == NULL_TAG)
+ goto null_tag;
+
+ sum = (s1 & 0xffff) | (s2 << 16);
+ tag_hits++;
+ do {
+ unsigned int l;
+ size_t i = targets[j].i;
+
+ if (sum != s->sums[i].sum1)
+ continue;
+
+ /* also make sure the two blocks are the same length */
+ l = MIN((OFF_T)s->blength, len-offset);
+ if (l != s->sums[i].len)
+ continue;
+
+ if (verbose > 3)
+ rprintf(FINFO,"potential match at %.0f target=%.0f %.0f sum=%08x\n",
+ (double)offset,(double)j,(double)i,sum);
+
+ if (!done_csum2) {
+ map = (schar *)map_ptr(buf,offset,l);
+ get_checksum2((char *)map,l,sum2);
+ done_csum2 = 1;
+ }
+
+ if (memcmp(sum2,s->sums[i].sum2,s->s2length) != 0) {
+ false_alarms++;
+ continue;
+ }
+
+ /* we've found a match, but now check to see
+ * if last_i can hint at a better match */
+ if (i != last_i + 1 && last_i + 1 < s->count
+ && sum == s->sums[last_i+1].sum1
+ && memcmp(sum2, s->sums[last_i+1].sum2, s->s2length) == 0) {
+ /* we've found an adjacent match - the RLL coder
+ * will be happy */
+ i = last_i + 1;
+ }
+ last_i = i;
+
+ matched(f,s,buf,offset,i);
+ offset += s->sums[i].len - 1;
+ k = MIN(s->blength, len-offset);
+ map = (schar *)map_ptr(buf, offset, k);
+ sum = get_checksum1((char *)map, k);
+ s1 = sum & 0xFFFF;
+ s2 = sum >> 16;
+ matches++;
+ break;
+ } while (++j < s->count && targets[j].t == t);
+
+ null_tag:
+ /* Trim off the first byte from the checksum */
+ map = (schar *)map_ptr(buf, offset, k+1);
+ s1 -= map[0] + CHAR_OFFSET;
+ s2 -= k * (map[0]+CHAR_OFFSET);
+
+ /* Add on the next byte (if there is one) to the checksum */
+ if (k < (len-offset)) {
+ s1 += (map[k]+CHAR_OFFSET);
+ s2 += s1;
+ } else
+ --k;
+
+ /* By matching early we avoid re-reading the
+ data 3 times in the case where a token
+ match comes a long way after last
+ match. The 3 reads are caused by the
+ running match, the checksum update and the
+ literal send. */
+ if (offset > last_match
+ && offset-last_match >= CHUNK_SIZE+s->blength
+ && end-offset > CHUNK_SIZE) {
+ matched(f,s,buf,offset - s->blength, -2);
+ }
+ } while (++offset < end);
+
+ matched(f,s,buf,len,-1);
+ map_ptr(buf,len-1,1);
}
-void match_sums(int f,struct sum_struct *s,char *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)
{
- last_match = 0;
- false_alarms = 0;
- tag_hits = 0;
- matches=0;
- data_transfer=0;
-
- if (len > 0 && s->count>0) {
- build_hash_table(s);
-
- if (verbose > 2)
- fprintf(stderr,"built hash table\n");
-
- hash_search(f,s,buf,len);
-
- if (verbose > 2)
- fprintf(stderr,"done hash search\n");
- } else {
- matched(f,s,buf,len,len,-1);
- }
-
- if (targets) {
- free(targets);
- targets=NULL;
- }
-
- if (verbose > 2)
- fprintf(stderr, "false_alarms=%d tag_hits=%d matches=%d\n",
- false_alarms, tag_hits, matches);
-
- total_tag_hits += tag_hits;
- total_false_alarms += false_alarms;
- total_matches += matches;
- total_data_transfer += data_transfer;
+ char file_sum[MD4_SUM_LENGTH];
+ extern int write_batch;
+
+ last_match = 0;
+ false_alarms = 0;
+ tag_hits = 0;
+ matches = 0;
+ data_transfer = 0;
+
+ sum_init(checksum_seed);
+
+ if (len > 0 && s->count>0) {
+ build_hash_table(s);
+
+ if (verbose > 2)
+ rprintf(FINFO,"built hash table\n");
+
+ hash_search(f,s,buf,len);
+
+ if (verbose > 2)
+ rprintf(FINFO,"done hash search\n");
+ } else {
+ OFF_T j;
+ /* by doing this in pieces we avoid too many seeks */
+ for (j = 0; j < len-CHUNK_SIZE; j += CHUNK_SIZE) {
+ int n1 = MIN(CHUNK_SIZE,(len-CHUNK_SIZE)-j);
+ matched(f,s,buf,j+n1,-2);
+ }
+ matched(f,s,buf,len,-1);
+ }
+
+ sum_end(file_sum);
+ /* If we had a read error, send a bad checksum. */
+ if (buf && buf->status != 0)
+ file_sum[0]++;
+
+ if (verbose > 2)
+ rprintf(FINFO,"sending file_sum\n");
+ write_buf(f,file_sum,MD4_SUM_LENGTH);
+ if (write_batch)
+ write_batch_delta_file(file_sum, MD4_SUM_LENGTH);
+
+ if (targets) {
+ free(targets);
+ targets=NULL;
+ }
+
+ if (verbose > 2)
+ rprintf(FINFO, "false_alarms=%d tag_hits=%d matches=%d\n",
+ false_alarms, tag_hits, matches);
+
+ total_tag_hits += tag_hits;
+ total_false_alarms += false_alarms;
+ total_matches += matches;
+ stats.literal_data += data_transfer;
}
void match_report(void)
{
- if (verbose <= 1)
- return;
-
- fprintf(am_server?stderr:stdout,
- "total: matches=%d tag_hits=%d false_alarms=%d data=%d\n",
- total_matches,total_tag_hits,
- total_false_alarms,total_data_transfer);
+ if (verbose <= 1)
+ return;
+
+ rprintf(FINFO,
+ "total: matches=%d tag_hits=%d false_alarms=%d data=%.0f\n",
+ total_matches,total_tag_hits,
+ total_false_alarms,
+ (double)stats.literal_data);
}