Set *set_union(Set *set1, Set *set2)
{
SetIterator iterator;
Set *new_set;
SetValue value;
new_set = set_new(set1->hash_func, set1->equal_func);
if (new_set == NULL) {
return NULL;
}
/* Add all values from the first set */
set_iterate(set1, &iterator);
while (set_iter_has_more(&iterator)) {
/* Read the next value */
value = set_iter_next(&iterator);
/* Copy the value into the new set */
if (!set_insert(new_set, value)) {
/* Failed to insert */
set_free(new_set);
return NULL;
}
}
/* Add all values from the second set */
set_iterate(set2, &iterator);
while (set_iter_has_more(&iterator)) {
/* Read the next value */
value = set_iter_next(&iterator);
/* Has this value been put into the new set already?
* If so, do not insert this again */
if (set_query(new_set, value) == 0) {
if (!set_insert(new_set, value)) {
/* Failed to insert */
set_free(new_set);
return NULL;
}
}
}
return new_set;
}
void test_set_iterating (void) {
Set* set;
SetIterator iterator;
int count;
set = generate_set();
/* Iterate over all values in the set */
count = 0;
set_iterate (set, &iterator);
while (set_iter_has_more (&iterator)) {
set_iter_next (&iterator);
++count;
}
/* Test iter_next after iteration has completed. */
assert (set_iter_next (&iterator) == NULL);
/* Check final count */
assert (count == 10000);
set_free (set);
/* Test iterating over an empty set */
set = set_new (int_hash, int_equal);
set_iterate (set, &iterator);
assert (set_iter_has_more (&iterator) == 0);
set_free (set);
}
Set *set_intersection(Set *set1, Set *set2)
{
Set *new_set;
SetIterator iterator;
SetValue value;
new_set = set_new(set1->hash_func, set2->equal_func);
if (new_set == NULL) {
return NULL;
}
/* Iterate over all values in set 1. */
set_iterate(set1, &iterator);
while (set_iter_has_more(&iterator)) {
/* Get the next value */
value = set_iter_next(&iterator);
/* Is this value in set 2 as well? If so, it should be
* in the new set. */
if (set_query(set2, value) != 0) {
/* Copy the value first before inserting,
* if necessary */
if (!set_insert(new_set, value)) {
set_free(new_set);
return NULL;
}
}
}
return new_set;
}
void test_set_iterating_remove (void) {
Set* set;
SetIterator iterator;
int count;
unsigned int removed;
char* value;
set = generate_set();
count = 0;
removed = 0;
/* Iterate over all values in the set */
set_iterate (set, &iterator);
while (set_iter_has_more (&iterator)) {
value = set_iter_next (&iterator);
if ( (atoi (value) % 100) == 0) {
/* Remove this value */
set_remove (set, value);
++removed;
}
++count;
}
/* Check final counts */
assert (count == 10000);
assert (removed == 100);
assert (set_num_entries (set) == 10000 - removed);
set_free (set);
}
int
main(int argc, char *argv[])
{
size_t path_len, total_files;
off_t bytes_wasted, total_wasted;
char path_buffer[PATH_MAX_LEN], *hash_value;
struct file_entry_t *file_entry, *trie_entry;
SListIterator slist_iterator;
SetIterator set_iterator;
/* Step 0: Session data */
struct file_info_t file_info;
clear_info(&file_info);
/* Step 1: Parse arguments */
while (--argc) {
/* Being unable to record implies insufficient resources */
if (!record(argv[argc], &file_info)){
fprintf(stderr, "[FATAL] out of memory\n");
destroy_info(&file_info);
return (EXIT_FAILURE);
}
}
/* Step 2: Fully explore any directories specified */
#ifndef NDEBUG
printf("[DEBUG] Creating file list...\n");
#endif
while (slist_length(file_info.file_stack) > 0) {
/* Pick off the top of the file stack */
file_entry = (struct file_entry_t *)(slist_data(file_info.file_stack));
slist_remove_entry(&file_info.file_stack, file_info.file_stack);
assert(file_entry->type == DIRECTORY);
/* Copy the basename to a buffer */
memset(path_buffer, '\0', PATH_MAX_LEN);
path_len = strnlen(file_entry->path, PATH_MAX_LEN);
memcpy(path_buffer, file_entry->path, path_len);
/* Ignore cases that would cause overflow */
if (path_len < PATH_MAX_LEN) {
/* Append a trailing slash */
path_buffer[path_len] = '/';
/* Record all contents (may push onto file stack or one of the lists) */
DIR *directory = opendir(file_entry->path);
if (traverse(&file_info, directory, path_buffer, ++path_len)) {
fprintf(stderr, "[FATAL] out of memory\n");
destroy_info(&file_info);
return (EXIT_FAILURE);
} else if (closedir(directory)) {
fprintf(stderr, "[WARNING] '%s' (close failed)\n", file_entry->path);
}
}
/* Discard this entry */
destroy_entry(file_entry);
}
/* Step 3: Warn about any ignored files */
if (slist_length(file_info.bad_files) > 0) {
slist_iterate(&file_info.bad_files, &slist_iterator);
while (slist_iter_has_more(&slist_iterator)) {
file_entry = slist_iter_next(&slist_iterator);
fprintf(stderr, "[WARNING] '%s' ", file_entry->path);
switch (file_entry->type) {
case INVALID:
++file_info.invalid_files;
fprintf(stderr, "(invalid file)\n");
break;
case INACCESSIBLE:
++file_info.protected_files;
fprintf(stderr, "(protected file)\n");
break;
default:
++file_info.irregular_files;
fprintf(stderr, "(irregular file)\n");
break;
}
}
fprintf(stderr, "[WARNING] %lu file(s) ignored\n",
(long unsigned)(num_errors(&file_info)));
}
#ifndef NDEBUG
if (num_errors(&file_info) > 0) {
fprintf(stderr, "[FATAL] cannot parse entire file tree\n");
destroy_info(&file_info);
return (EXIT_FAILURE);
}
printf("[DEBUG] Found %lu / %lu valid files\n",
(unsigned long)(num_files(&file_info)),
(unsigned long)(file_info.total_files));
#endif
/* Step 4: Begin the filtering process */
#ifndef NDEBUG
printf("[DEBUG] Creating file table...\n");
#endif
if (slist_length(file_info.good_files) > 0) {
file_info.hash_trie = trie_new();
file_info.shash_trie = trie_new();
optimize_filter(&file_info);
/* Extract each file from the list (they should all be regular) */
slist_iterate(&file_info.good_files, &slist_iterator);
while (slist_iter_has_more(&slist_iterator)) {
file_entry = slist_iter_next(&slist_iterator);
assert(file_entry->type == REGULAR);
/* Perform a "shallow" hash of the file */
hash_value = hash_entry(file_entry, SHALLOW);
#ifndef NDEBUG
printf("[SHASH] %s\t*%s\n", file_entry->path, hash_value);
#endif
/* Check to see if we might have seen this file before */
if (bloom_filter_query(file_info.shash_filter, hash_value)) {
/* Get the full hash of the new file */
hash_value = hash_entry(file_entry, FULL);
#ifndef NDEBUG
printf("[+HASH] %s\t*%s\n", file_entry->path, hash_value);
#endif
archive(&file_info, file_entry);
/* Check to see if bloom failed us */
trie_entry = trie_lookup(file_info.shash_trie, file_entry->shash);
if (trie_entry == TRIE_NULL) {
#ifndef NDEBUG
printf("[DEBUG] '%s' (false positive)\n", file_entry->path);
#endif
trie_insert(file_info.shash_trie, file_entry->shash, file_entry);
} else {
/* Get the full hash of the old file */
hash_value = hash_entry(trie_entry, FULL);
#ifndef NDEBUG
if (hash_value) {
printf("[-HASH] %s\t*%s\n", trie_entry->path, hash_value);
}
#endif
archive(&file_info, trie_entry);
}
} else {
/* Add a record of this shash to the filter */
bloom_filter_insert(file_info.shash_filter, hash_value);
trie_insert(file_info.shash_trie, hash_value, file_entry);
}
}
persist("bloom_store", &file_info);
}
/* Step 5: Output results and cleanup before exit */
printf("[EXTRA] Found %lu sets of duplicates...\n",
(unsigned long)(slist_length(file_info.duplicates)));
slist_iterate(&file_info.duplicates, &slist_iterator);
for (total_files = total_wasted = bytes_wasted = 0;
slist_iter_has_more(&slist_iterator);
total_wasted += bytes_wasted)
{
Set *set = slist_iter_next(&slist_iterator);
int size = set_num_entries(set);
if (size < 2) { continue; }
printf("[EXTRA] %lu files (w/ same hash):\n", (unsigned long)(size));
set_iterate(set, &set_iterator);
for (bytes_wasted = 0;
set_iter_has_more(&set_iterator);
bytes_wasted += file_entry->size,
++total_files)
{
file_entry = set_iter_next(&set_iterator);
printf("\t%s (%lu bytes)\n",
file_entry->path,
(unsigned long)(file_entry->size));
}
}
printf("[EXTRA] %lu bytes in %lu files (wasted)\n",
(unsigned long)(total_wasted),
(unsigned long)(total_files));
destroy_info(&file_info);
return (EXIT_SUCCESS);
}