static void rm_directory_add_subdir(RmDirectory *parent, RmDirectory *subdir) {
if(subdir->was_merged) {
return;
}
parent->mergeups = subdir->mergeups + parent->mergeups + 1;
parent->dupe_count += subdir->dupe_count;
g_queue_push_head(&parent->children, subdir);
parent->prefd_files += subdir->prefd_files;
#ifdef _RM_TREEMERGE_DEBUG
g_printerr("%55s (%3ld/%3ld) <- %s (%3ld/%3ld)\n", parent->dirname,
parent->dupe_count, parent->file_count, subdir->dirname,
subdir->dupe_count, subdir->file_count);
#endif
/**
* Here's something weird:
* - a counter is used and substraced at once from parent->dupe_count.
* - it would ofc. be nicer to substract it step by step.
* - but for some weird reasons this only works on clang, not gcc.
* - yes, what. But I tested this, I promise!
*/
for(GList *iter = subdir->known_files.head; iter; iter = iter->next) {
int c = rm_directory_add(parent, (RmFile *)iter->data);
parent->dupe_count -= c;
}
/* Inherit the child's checksum */
unsigned char *subdir_cksum = rm_digest_steal_buffer(subdir->digest);
rm_digest_update(parent->digest, subdir_cksum, subdir->digest->bytes);
g_slice_free1(subdir->digest->bytes, subdir_cksum);
subdir->was_merged = true;
}
static int rm_directory_add(RmDirectory *directory, RmFile *file) {
/* Update the directorie's hash with the file's hash
Since we cannot be sure in which order the files come in
we have to add the hash cummulatively.
*/
int new_dupes = 0;
g_assert(file);
g_assert(file->digest);
g_assert(directory);
guint8 *file_digest = NULL;
RmOff digest_bytes = 0;
if(file->digest->type == RM_DIGEST_PARANOID) {
file_digest = rm_digest_steal_buffer(file->digest->shadow_hash);
digest_bytes = file->digest->shadow_hash->bytes;
} else {
file_digest = rm_digest_steal_buffer(file->digest);
digest_bytes = file->digest->bytes;
}
/* + and not XOR, since ^ would yield 0 for same hashes always. No matter
* which hashes. Also this would be confusing. For me and for debuggers.
*/
rm_digest_update(directory->digest, file_digest, digest_bytes);
/* The file value is not really used, but we need some non-null value */
g_hash_table_add(directory->hash_set, file->digest);
g_slice_free1(digest_bytes, file_digest);
if(file->hardlinks.is_head && file->hardlinks.files) {
new_dupes = 1 + g_queue_get_length(file->hardlinks.files);
} else {
new_dupes = 1;
}
directory->dupe_count += new_dupes;
directory->prefd_files += file->is_prefd;
return new_dupes;
}
void rm_digest_buffered_update(RmBuffer *buffer) {
RmDigest *digest = buffer->digest;
if(digest->type != RM_DIGEST_PARANOID) {
rm_digest_update(digest, buffer->data, buffer->len);
rm_buffer_release(buffer);
} else {
RmParanoid *paranoid = digest->paranoid;
/* efficiently append buffer to buffers GSList */
if(!paranoid->buffers) {
/* first buffer */
paranoid->buffers = g_slist_prepend(NULL, buffer);
paranoid->buffer_tail = paranoid->buffers;
} else {
paranoid->buffer_tail = g_slist_append(paranoid->buffer_tail, buffer)->next;
}
digest->bytes += buffer->len;
if(paranoid->shadow_hash) {
rm_digest_update(paranoid->shadow_hash, buffer->data, buffer->len);
}
if(paranoid->twin_candidate) {
/* do a running check that digest remains the same as its candidate twin */
if(rm_buffer_equal(buffer, paranoid->twin_candidate_buffer->data)) {
/* buffers match; move ptr to next one ready for next buffer */
paranoid->twin_candidate_buffer = paranoid->twin_candidate_buffer->next;
} else {
/* buffers don't match - delete candidate (new candidate might be added on
* next
* call to rm_digest_buffered_update) */
paranoid->twin_candidate = NULL;
paranoid->twin_candidate_buffer = NULL;
#if _RM_CHECKSUM_DEBUG
rm_log_debug_line("Ejected candidate match at buffer #%u",
g_slist_length(paranoid->buffers));
#endif
}
}
while(!paranoid->twin_candidate && paranoid->incoming_twin_candidates &&
(paranoid->twin_candidate =
g_async_queue_try_pop(paranoid->incoming_twin_candidates))) {
/* validate the new candidate by comparing the previous buffers (not
* including current)*/
paranoid->twin_candidate_buffer = paranoid->twin_candidate->paranoid->buffers;
GSList *iter_self = paranoid->buffers;
gboolean match = TRUE;
while(match && iter_self) {
match = (rm_buffer_equal(paranoid->twin_candidate_buffer->data,
iter_self->data));
iter_self = iter_self->next;
paranoid->twin_candidate_buffer = paranoid->twin_candidate_buffer->next;
}
if(paranoid->twin_candidate && !match) {
/* reject the twin candidate, also add to rejects list to speed up rm_digest_equal() */
#if _RM_CHECKSUM_DEBUG
rm_log_debug_line("Rejected twin candidate %p for %p",
paranoid->twin_candidate, paranoid);
#endif
if(!paranoid->shadow_hash) {
/* we use the rejects file to speed up rm_digest_equal */
paranoid->rejects =
g_slist_prepend(paranoid->rejects, paranoid->twin_candidate);
}
paranoid->twin_candidate = NULL;
paranoid->twin_candidate_buffer = NULL;
#if _RM_CHECKSUM_DEBUG
} else {
rm_log_debug_line("Added twin candidate %p for %p",
paranoid->twin_candidate, paranoid);
#endif
}
}
}
}
void rm_digest_update(RmDigest *digest, const unsigned char *data, RmOff size) {
switch(digest->type) {
case RM_DIGEST_MD5:
case RM_DIGEST_SHA512:
case RM_DIGEST_SHA256:
case RM_DIGEST_SHA1:
g_checksum_update(digest->glib_checksum, (const guchar *)data, size);
break;
case RM_DIGEST_SPOOKY32:
digest->checksum[0].first = spooky_hash32(data, size, digest->checksum[0].first);
break;
case RM_DIGEST_SPOOKY64:
digest->checksum[0].first = spooky_hash64(data, size, digest->checksum[0].first);
break;
case RM_DIGEST_SPOOKY:
spooky_hash128(data, size, &digest->checksum[0].first, &digest->checksum[0].second);
break;
case RM_DIGEST_MURMUR512:
case RM_DIGEST_MURMUR256:
case RM_DIGEST_MURMUR:
for (guint8 block = 0; block < ( digest->bytes / 16 ); block++) {
#if RM_PLATFORM_32
MurmurHash3_x86_128(data, size,
(uint32_t)digest->checksum[block].first,
&digest->checksum[block]); //&
#elif RM_PLATFORM_64
MurmurHash3_x64_128(data, size,
(uint32_t)digest->checksum[block].first,
&digest->checksum[block]);
#else
#error "Probably not a good idea to compile rmlint on 16bit."
#endif
}
break;
case RM_DIGEST_CITY:
case RM_DIGEST_CITY256:
case RM_DIGEST_CITY512:
for (guint8 block = 0; block < (digest->bytes / 16); block++) {
/* Opt out for the more optimized version.
* This needs the crc command of sse4.2
* (available on Intel Nehalem and up; my amd box doesn't have this though)
*/
#if RM_PLATFORM_64 && HAVE_SSE42
digest->checksum[block] = CityHashCrc128WithSeed((const char *)data, size, digest->checksum[block]);
#else
digest->checksum[block] = CityHash128WithSeed((const char *) data, size, digest->checksum[block]);
#endif
}
break;
case RM_DIGEST_BASTARD:
MurmurHash3_x86_128(data, size, (uint32_t)digest->checksum[0].first, &digest->checksum[0]);
#if RM_PLATFORM_64 && HAVE_SSE42
digest->checksum[1] = CityHashCrc128WithSeed((const char *)data, size, digest->checksum[1]);
#else
digest->checksum[1] = CityHash128WithSeed((const char *) data, size, digest->checksum[1]);
#endif
break;
case RM_DIGEST_CUMULATIVE: {
/* This is basically FNV1a, it is just important that the order of
* adding data to the hash has no effect on the result, so it can
* be used as a lookup key:
*
* http://en.wikipedia.org/wiki/Fowler%E2%80%93Noll%E2%80%93Vo_hash_function
* */
RmOff hash = 0xcbf29ce484222325;
for(gsize i = 0; i < digest->bytes; ++i) {
hash ^= ((guint8 *)data)[i % size];
hash *= 0x100000001b3;
((guint8 *)digest->checksum)[i] += hash;
}
}
break;
case RM_DIGEST_PARANOID:
g_assert(size + digest->paranoid_offset <= digest->bytes);
memcpy((char *)digest->checksum + digest->paranoid_offset, data, size);
digest->paranoid_offset += size;
rm_digest_update(digest->shadow_hash, data, size);
break;
default:
g_assert_not_reached();
}
}