|
|
| version 1.1.1.1, 2012/02/17 15:09:30 | version 1.1.1.3, 2016/11/01 09:54:32 |
|---|---|
| Line 3 | Line 3 |
| * | * |
| * Copyright (C) 1996 Andrew Tridgell | * Copyright (C) 1996 Andrew Tridgell |
| * Copyright (C) 1996 Paul Mackerras | * Copyright (C) 1996 Paul Mackerras |
| * Copyright (C) 2003-2009 Wayne Davison | * Copyright (C) 2003-2015 Wayne Davison |
| * | * |
| * This program is free software; you can redistribute it and/or modify | * 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 | * it under the terms of the GNU General Public License as published by |
| Line 20 | Line 20 |
| */ | */ |
| #include "rsync.h" | #include "rsync.h" |
| #include "inums.h" | |
| extern int verbose; | |
| extern int do_progress; | |
| extern int checksum_seed; | extern int checksum_seed; |
| extern int append_mode; | extern int append_mode; |
| extern int checksum_len; | |
| int updating_basis_file; | int updating_basis_file; |
| char sender_file_sum[MAX_DIGEST_LEN]; | |
| static int false_alarms; | static int false_alarms; |
| static int hash_hits; | static int hash_hits; |
| Line 107 static void matched(int f, struct sum_struct *s, struc | Line 108 static void matched(int f, struct sum_struct *s, struc |
| int32 n = (int32)(offset - last_match); /* max value: block_size (int32) */ | int32 n = (int32)(offset - last_match); /* max value: block_size (int32) */ |
| int32 j; | int32 j; |
| if (verbose > 2 && i >= 0) { | if (DEBUG_GTE(DELTASUM, 2) && i >= 0) { |
| rprintf(FINFO, | rprintf(FINFO, |
| "match at %.0f last_match=%.0f j=%d len=%ld n=%ld\n", | "match at %s last_match=%s j=%d len=%ld n=%ld\n", |
| (double)offset, (double)last_match, i, | big_num(offset), big_num(last_match), i, |
| (long)s->sums[i].len, (long)n); | (long)s->sums[i].len, (long)n); |
| } | } |
| Line 132 static void matched(int f, struct sum_struct *s, struc | Line 133 static void matched(int f, struct sum_struct *s, struc |
| else | else |
| last_match = offset; | last_match = offset; |
| if (buf && do_progress) | if (buf && INFO_GTE(PROGRESS, 1)) |
| show_progress(last_match, buf->file_size); | show_progress(last_match, buf->file_size); |
| } | } |
| Line 151 static void hash_search(int f,struct sum_struct *s, | Line 152 static void hash_search(int f,struct sum_struct *s, |
| * coding of the output to work more efficiently. */ | * coding of the output to work more efficiently. */ |
| want_i = 0; | want_i = 0; |
| if (verbose > 2) { | if (DEBUG_GTE(DELTASUM, 2)) { |
| rprintf(FINFO, "hash search b=%ld len=%.0f\n", | rprintf(FINFO, "hash search b=%ld len=%s\n", |
| (long)s->blength, (double)len); | (long)s->blength, big_num(len)); |
| } | } |
| k = (int32)MIN(len, (OFF_T)s->blength); | k = (int32)MIN(len, (OFF_T)s->blength); |
| Line 163 static void hash_search(int f,struct sum_struct *s, | Line 164 static void hash_search(int f,struct sum_struct *s, |
| sum = get_checksum1((char *)map, k); | sum = get_checksum1((char *)map, k); |
| s1 = sum & 0xFFFF; | s1 = sum & 0xFFFF; |
| s2 = sum >> 16; | s2 = sum >> 16; |
| if (verbose > 3) | if (DEBUG_GTE(DELTASUM, 3)) |
| rprintf(FINFO, "sum=%.8x k=%ld\n", sum, (long)k); | rprintf(FINFO, "sum=%.8x k=%ld\n", sum, (long)k); |
| offset = aligned_offset = aligned_i = 0; | offset = aligned_offset = aligned_i = 0; |
| end = len + 1 - s->sums[s->count-1].len; | end = len + 1 - s->sums[s->count-1].len; |
| if (verbose > 3) { | if (DEBUG_GTE(DELTASUM, 3)) { |
| rprintf(FINFO, "hash search s->blength=%ld len=%.0f count=%.0f\n", | rprintf(FINFO, "hash search s->blength=%ld len=%s count=%s\n", |
| (long)s->blength, (double)len, (double)s->count); | (long)s->blength, big_num(len), big_num(s->count)); |
| } | } |
| do { | do { |
| int done_csum2 = 0; | int done_csum2 = 0; |
| int32 i; | uint32 hash_entry; |
| int32 i, *prev; | |
| if (verbose > 4) { | if (DEBUG_GTE(DELTASUM, 4)) { |
| rprintf(FINFO, "offset=%.0f sum=%04x%04x\n", | rprintf(FINFO, "offset=%s sum=%04x%04x\n", |
| (double)offset, s2 & 0xFFFF, s1 & 0xFFFF); | big_num(offset), s2 & 0xFFFF, s1 & 0xFFFF); |
| } | } |
| if (tablesize == TRADITIONAL_TABLESIZE) { | if (tablesize == TRADITIONAL_TABLESIZE) { |
| if ((i = hash_table[SUM2HASH2(s1,s2)]) < 0) | hash_entry = SUM2HASH2(s1,s2); |
| if ((i = hash_table[hash_entry]) < 0) | |
| goto null_hash; | goto null_hash; |
| sum = (s1 & 0xffff) | (s2 << 16); | sum = (s1 & 0xffff) | (s2 << 16); |
| } else { | } else { |
| sum = (s1 & 0xffff) | (s2 << 16); | sum = (s1 & 0xffff) | (s2 << 16); |
| if ((i = hash_table[BIG_SUM2HASH(sum)]) < 0) | hash_entry = BIG_SUM2HASH(sum); |
| if ((i = hash_table[hash_entry]) < 0) | |
| goto null_hash; | goto null_hash; |
| } | } |
| prev = &hash_table[hash_entry]; | |
| hash_hits++; | hash_hits++; |
| do { | do { |
| int32 l; | int32 l; |
| /* When updating in-place, the chunk's offset must be | |
| * either >= our offset or identical data at that offset. | |
| * Remove any bypassed entries that we can never use. */ | |
| if (updating_basis_file && s->sums[i].offset < offset | |
| && !(s->sums[i].flags & SUMFLG_SAME_OFFSET)) { | |
| *prev = s->sums[i].chain; | |
| continue; | |
| } | |
| prev = &s->sums[i].chain; | |
| if (sum != s->sums[i].sum1) | if (sum != s->sums[i].sum1) |
| continue; | continue; |
| Line 206 static void hash_search(int f,struct sum_struct *s, | Line 221 static void hash_search(int f,struct sum_struct *s, |
| if (l != s->sums[i].len) | if (l != s->sums[i].len) |
| continue; | continue; |
| /* in-place: ensure chunk's offset is either >= our | if (DEBUG_GTE(DELTASUM, 3)) { |
| * offset or that the data didn't move. */ | |
| if (updating_basis_file && s->sums[i].offset < offset | |
| && !(s->sums[i].flags & SUMFLG_SAME_OFFSET)) | |
| continue; | |
| if (verbose > 3) { | |
| rprintf(FINFO, | rprintf(FINFO, |
| "potential match at %.0f i=%ld sum=%08x\n", | "potential match at %s i=%ld sum=%08x\n", |
| (double)offset, (long)i, sum); | big_num(offset), (long)i, sum); |
| } | } |
| if (!done_csum2) { | if (!done_csum2) { |
| Line 238 static void hash_search(int f,struct sum_struct *s, | Line 247 static void hash_search(int f,struct sum_struct *s, |
| aligned_offset += s->blength; | aligned_offset += s->blength; |
| aligned_i++; | aligned_i++; |
| } | } |
| if (offset == aligned_offset && aligned_i < s->count) { | if ((offset == aligned_offset |
| || (sum == 0 && l == s->blength && aligned_offset + l <= len)) | |
| && aligned_i < s->count) { | |
| if (i != aligned_i) { | if (i != aligned_i) { |
| if (sum != s->sums[aligned_i].sum1 | if (sum != s->sums[aligned_i].sum1 |
| || l != s->sums[aligned_i].len | || l != s->sums[aligned_i].len |
| Line 246 static void hash_search(int f,struct sum_struct *s, | Line 257 static void hash_search(int f,struct sum_struct *s, |
| goto check_want_i; | goto check_want_i; |
| i = aligned_i; | i = aligned_i; |
| } | } |
| if (offset != aligned_offset) { | |
| /* We've matched some zeros in a spot that is also zeros | |
| * further along in the basis file, if we find zeros ahead | |
| * in the sender's file, we'll output enough literal data | |
| * to re-align with the basis file, and get back to seeking | |
| * instead of writing. */ | |
| backup = (int32)(aligned_offset - last_match); | |
| if (backup < 0) | |
| backup = 0; | |
| map = (schar *)map_ptr(buf, aligned_offset - backup, l + backup) | |
| + backup; | |
| sum = get_checksum1((char *)map, l); | |
| if (sum != s->sums[i].sum1) | |
| goto check_want_i; | |
| get_checksum2((char *)map, l, sum2); | |
| if (memcmp(sum2, s->sums[i].sum2, s->s2length) != 0) | |
| goto check_want_i; | |
| /* OK, we have a re-alignment match. Bump the offset | |
| * forward to the new match point. */ | |
| offset = aligned_offset; | |
| } | |
| /* This identical chunk is in the same spot in the old and new file. */ | /* This identical chunk is in the same spot in the old and new file. */ |
| s->sums[i].flags |= SUMFLG_SAME_OFFSET; | s->sums[i].flags |= SUMFLG_SAME_OFFSET; |
| want_i = i; | want_i = i; |
| Line 328 static void hash_search(int f,struct sum_struct *s, | Line 360 static void hash_search(int f,struct sum_struct *s, |
| **/ | **/ |
| void match_sums(int f, struct sum_struct *s, struct map_struct *buf, OFF_T len) | void match_sums(int f, struct sum_struct *s, struct map_struct *buf, OFF_T len) |
| { | { |
| char file_sum[MAX_DIGEST_LEN]; | |
| int sum_len; | |
| last_match = 0; | last_match = 0; |
| false_alarms = 0; | false_alarms = 0; |
| hash_hits = 0; | hash_hits = 0; |
| Line 343 void match_sums(int f, struct sum_struct *s, struct ma | Line 372 void match_sums(int f, struct sum_struct *s, struct ma |
| if (append_mode == 2) { | if (append_mode == 2) { |
| OFF_T j = 0; | OFF_T j = 0; |
| for (j = CHUNK_SIZE; j < s->flength; j += CHUNK_SIZE) { | for (j = CHUNK_SIZE; j < s->flength; j += CHUNK_SIZE) { |
| if (buf && do_progress) | if (buf && INFO_GTE(PROGRESS, 1)) |
| show_progress(last_match, buf->file_size); | show_progress(last_match, buf->file_size); |
| sum_update(map_ptr(buf, last_match, CHUNK_SIZE), | sum_update(map_ptr(buf, last_match, CHUNK_SIZE), |
| CHUNK_SIZE); | CHUNK_SIZE); |
| Line 351 void match_sums(int f, struct sum_struct *s, struct ma | Line 380 void match_sums(int f, struct sum_struct *s, struct ma |
| } | } |
| if (last_match < s->flength) { | if (last_match < s->flength) { |
| int32 n = (int32)(s->flength - last_match); | int32 n = (int32)(s->flength - last_match); |
| if (buf && do_progress) | if (buf && INFO_GTE(PROGRESS, 1)) |
| show_progress(last_match, buf->file_size); | show_progress(last_match, buf->file_size); |
| sum_update(map_ptr(buf, last_match, n), n); | sum_update(map_ptr(buf, last_match, n), n); |
| } | } |
| Line 363 void match_sums(int f, struct sum_struct *s, struct ma | Line 392 void match_sums(int f, struct sum_struct *s, struct ma |
| if (len > 0 && s->count > 0) { | if (len > 0 && s->count > 0) { |
| build_hash_table(s); | build_hash_table(s); |
| if (verbose > 2) | if (DEBUG_GTE(DELTASUM, 2)) |
| rprintf(FINFO,"built hash table\n"); | rprintf(FINFO,"built hash table\n"); |
| hash_search(f, s, buf, len); | hash_search(f, s, buf, len); |
| if (verbose > 2) | if (DEBUG_GTE(DELTASUM, 2)) |
| rprintf(FINFO,"done hash search\n"); | rprintf(FINFO,"done hash search\n"); |
| } else { | } else { |
| OFF_T j; | OFF_T j; |
| Line 378 void match_sums(int f, struct sum_struct *s, struct ma | Line 407 void match_sums(int f, struct sum_struct *s, struct ma |
| matched(f, s, buf, len, -1); | matched(f, s, buf, len, -1); |
| } | } |
| sum_len = sum_end(file_sum); | if (sum_end(sender_file_sum) != checksum_len) |
| /* If we had a read error, send a bad checksum. */ | overflow_exit("checksum_len"); /* Impossible... */ |
| if (buf && buf->status != 0) | |
| file_sum[0]++; | |
| if (verbose > 2) | /* If we had a read error, send a bad checksum. We use all bits |
| * off as long as the checksum doesn't happen to be that, in | |
| * which case we turn the last 0 bit into a 1. */ | |
| if (buf && buf->status != 0) { | |
| int i; | |
| for (i = 0; i < checksum_len && sender_file_sum[i] == 0; i++) {} | |
| memset(sender_file_sum, 0, checksum_len); | |
| if (i == checksum_len) | |
| sender_file_sum[i-1]++; | |
| } | |
| if (DEBUG_GTE(DELTASUM, 2)) | |
| rprintf(FINFO,"sending file_sum\n"); | rprintf(FINFO,"sending file_sum\n"); |
| write_buf(f, file_sum, sum_len); | write_buf(f, sender_file_sum, checksum_len); |
| if (verbose > 2) | if (DEBUG_GTE(DELTASUM, 2)) { |
| rprintf(FINFO, "false_alarms=%d hash_hits=%d matches=%d\n", | rprintf(FINFO, "false_alarms=%d hash_hits=%d matches=%d\n", |
| false_alarms, hash_hits, matches); | false_alarms, hash_hits, matches); |
| } | |
| total_hash_hits += hash_hits; | total_hash_hits += hash_hits; |
| total_false_alarms += false_alarms; | total_false_alarms += false_alarms; |
| Line 399 void match_sums(int f, struct sum_struct *s, struct ma | Line 438 void match_sums(int f, struct sum_struct *s, struct ma |
| void match_report(void) | void match_report(void) |
| { | { |
| if (verbose <= 1) | if (!DEBUG_GTE(DELTASUM, 1)) |
| return; | return; |
| rprintf(FINFO, | rprintf(FINFO, |
| "total: matches=%d hash_hits=%d false_alarms=%d data=%.0f\n", | "total: matches=%d hash_hits=%d false_alarms=%d data=%s\n", |
| total_matches, total_hash_hits, total_false_alarms, | total_matches, total_hash_hits, total_false_alarms, |
| (double)stats.literal_data); | big_num(stats.literal_data)); |
| } | } |