+ // This loop is executed until all resources have been written, except
+ // possibly a few that have been added to the @my_resources list for
+ // writing later.
+ while (1) {
+ // Send chunks to the compressor threads until either (a) there
+ // are no more messages available since they were all sent off,
+ // or (b) there are no more resources that need to be
+ // compressed.
+ while (!list_empty(&available_msgs)) {
+ if (next_chunk == next_num_chunks) {
+ // If next_chunk == next_num_chunks, there are
+ // no more chunks to write in the current
+ // stream. So, check the SHA1 message digest of
+ // the stream that was just finished (unless
+ // next_lte == NULL, which is the case the very
+ // first time this loop is entered, and also
+ // near the very end of the compression when
+ // there are no more streams.) Then, advance to
+ // the next stream (if there is one).
+ if (next_lte != NULL) {
+ #ifdef WITH_NTFS_3G
+ end_wim_resource_read(next_lte, ni);
+ ni = NULL;
+ #else
+ end_wim_resource_read(next_lte);
+ #endif
+ DEBUG2("Finalize SHA1 md (next_num_chunks=%zu)",
+ next_num_chunks);
+ sha1_final(next_hash, &next_sha_ctx);
+ if (!hashes_equal(next_lte->hash, next_hash)) {
+ ERROR("WIM resource has incorrect hash!");
+ if (next_lte->resource_location ==
+ RESOURCE_IN_FILE_ON_DISK)
+ {
+ ERROR("We were reading it from `%s'; "
+ "maybe it changed while we were "
+ "reading it.",
+ next_lte->file_on_disk);
+ }
+ ret = WIMLIB_ERR_INVALID_RESOURCE_HASH;
+ goto out;
+ }
+ }
+
+ // Advance to the next resource.
+ //
+ // If the next resource needs no compression, just write
+ // it with this thread (not now though--- we could be in
+ // the middle of writing another resource.) Keep doing
+ // this until we either get to the end of the resources
+ // list, or we get to a resource that needs compression.
+ while (1) {
+ if (next_resource == stream_list) {
+ // No more resources to send for
+ // compression
+ next_lte = NULL;
+ break;
+ }
+ next_lte = container_of(next_resource,
+ struct lookup_table_entry,
+ staging_list);
+ next_resource = next_resource->next;
+ if ((!(write_flags & WIMLIB_WRITE_FLAG_RECOMPRESS)
+ && wim_resource_compression_type(next_lte) == out_ctype)
+ || wim_resource_size(next_lte) == 0)
+ {
+ list_add_tail(&next_lte->staging_list,
+ &my_resources);
+ } else {
+ list_add_tail(&next_lte->staging_list,
+ &outstanding_resources);
+ next_chunk = 0;
+ next_num_chunks = wim_resource_chunks(next_lte);
+ sha1_init(&next_sha_ctx);
+ INIT_LIST_HEAD(&next_lte->msg_list);
+ #ifdef WITH_NTFS_3G
+ ret = prepare_resource_for_read(next_lte, &ni);
+ #else
+ ret = prepare_resource_for_read(next_lte);
+ #endif
+
+ if (ret != 0)
+ goto out;
+ if (cur_lte == NULL) {
+ // Set cur_lte for the
+ // first time
+ cur_lte = next_lte;
+ }
+ break;
+ }
+ }
+ }
+
+ if (next_lte == NULL) {
+ // No more resources to send for compression
+ break;
+ }
+
+ // Get a message from the available messages
+ // list
+ msg = container_of(available_msgs.next,
+ struct message,
+ list);
+
+ // ... and delete it from the available messages
+ // list
+ list_del(&msg->list);
+
+ // Initialize the message with the chunks to
+ // compress.
+ msg->num_chunks = min(next_num_chunks - next_chunk,
+ MAX_CHUNKS_PER_MSG);
+ msg->lte = next_lte;
+ msg->complete = false;
+ msg->begin_chunk = next_chunk;
+
+ unsigned size = WIM_CHUNK_SIZE;
+ for (unsigned i = 0; i < msg->num_chunks; i++) {
+
+ // Read chunk @next_chunk of the stream into the
+ // message so that a compressor thread can
+ // compress it.
+
+ if (next_chunk == next_num_chunks - 1) {
+ size = MODULO_NONZERO(wim_resource_size(next_lte),
+ WIM_CHUNK_SIZE);
+ }
+
+ DEBUG2("Read resource (size=%u, offset=%zu)",
+ size, next_chunk * WIM_CHUNK_SIZE);
+
+ msg->uncompressed_chunk_sizes[i] = size;
+
+ ret = read_wim_resource(next_lte,
+ msg->uncompressed_chunks[i],
+ size,
+ next_chunk * WIM_CHUNK_SIZE,
+ 0);
+ if (ret != 0)
+ goto out;
+ sha1_update(&next_sha_ctx,
+ msg->uncompressed_chunks[i], size);
+ next_chunk++;
+ }
+
+ // Send the compression request
+ list_add_tail(&msg->list, &next_lte->msg_list);
+ shared_queue_put(res_to_compress_queue, msg);
+ DEBUG2("Compression request sent");
+ }
+
+ // If there are no outstanding resources, there are no more
+ // resources that need to be written.
+ if (list_empty(&outstanding_resources)) {
+ ret = 0;
+ goto out;
+ }
+
+ // Get the next message from the queue and process it.
+ // The message will contain 1 or more data chunks that have been
+ // compressed.
+ msg = shared_queue_get(compressed_res_queue);
+ msg->complete = true;
+
+ // Is this the next chunk in the current resource? If it's not
+ // (i.e., an earlier chunk in a same or different resource
+ // hasn't been compressed yet), do nothing, and keep this
+ // message around until all earlier chunks are received.
+ //
+ // Otherwise, write all the chunks we can.
+ while (cur_lte != NULL &&
+ !list_empty(&cur_lte->msg_list) &&
+ (msg = container_of(cur_lte->msg_list.next,
+ struct message,
+ list))->complete)
+ {
+ DEBUG2("Complete msg (begin_chunk=%"PRIu64")", msg->begin_chunk);
+ if (msg->begin_chunk == 0) {
+ DEBUG2("Begin chunk tab");
+
+ // This is the first set of chunks. Leave space
+ // for the chunk table in the output file.
+ off_t cur_offset = ftello(out_fp);
+ if (cur_offset == -1) {
+ ret = WIMLIB_ERR_WRITE;
+ goto out;
+ }
+ ret = begin_wim_resource_chunk_tab(cur_lte,
+ out_fp,
+ cur_offset,
+ &cur_chunk_tab);
+ if (ret != 0)
+ goto out;
+ }
+
+ // Write the compressed chunks from the message.
+ ret = write_wim_chunks(msg, out_fp, cur_chunk_tab);
+ if (ret != 0)
+ goto out;
+
+ list_del(&msg->list);
+
+ // This message is available to use for different chunks
+ // now.
+ list_add(&msg->list, &available_msgs);
+
+ // Was this the last chunk of the stream? If so, finish
+ // it.
+ if (list_empty(&cur_lte->msg_list) &&
+ msg->begin_chunk + msg->num_chunks == cur_chunk_tab->num_chunks)
+ {
+ DEBUG2("Finish wim chunk tab");
+ u64 res_csize;
+ ret = finish_wim_resource_chunk_tab(cur_chunk_tab,
+ out_fp,
+ &res_csize);
+ if (ret != 0)
+ goto out;
+
+ if (res_csize >= wim_resource_size(cur_lte)) {
+ /* Oops! We compressed the resource to
+ * larger than the original size. Write
+ * the resource uncompressed instead. */
+ ret = write_uncompressed_resource_and_truncate(
+ cur_lte,
+ out_fp,
+ cur_chunk_tab->file_offset,
+ &cur_lte->output_resource_entry);
+ if (ret != 0)
+ goto out;
+ } else {
+ cur_lte->output_resource_entry.size =
+ res_csize;
+
+ cur_lte->output_resource_entry.original_size =
+ cur_lte->resource_entry.original_size;
+
+ cur_lte->output_resource_entry.offset =
+ cur_chunk_tab->file_offset;
+
+ cur_lte->output_resource_entry.flags =
+ cur_lte->resource_entry.flags |
+ WIM_RESHDR_FLAG_COMPRESSED;
+ }
+
+ progress->write_streams.completed_bytes +=
+ wim_resource_size(cur_lte);
+ progress->write_streams.completed_streams++;
+
+ if (progress_func) {
+ progress_func(WIMLIB_PROGRESS_MSG_WRITE_STREAMS,
+ progress);
+ }
+
+ FREE(cur_chunk_tab);
+ cur_chunk_tab = NULL;
+
+ struct list_head *next = cur_lte->staging_list.next;
+ list_del(&cur_lte->staging_list);
+
+ if (next == &outstanding_resources)
+ cur_lte = NULL;
+ else
+ cur_lte = container_of(cur_lte->staging_list.next,
+ struct lookup_table_entry,
+ staging_list);
+
+ // Since we just finished writing a stream,
+ // write any streams that have been added to the
+ // my_resources list for direct writing by the
+ // main thread (e.g. resources that don't need
+ // to be compressed because the desired
+ // compression type is the same as the previous
+ // compression type).
+ ret = do_write_stream_list(&my_resources,
+ out_fp,
+ out_ctype,
+ progress_func,
+ progress,
+ 0);
+ if (ret != 0)
+ goto out;
+ }