+ if (!stream_is_named_data_stream(strm) ||
+ stream_blob_resolved(strm) != NULL)
+ continue;
+
+ build_extraction_path_with_ads(dentry, ctx,
+ strm->stream_name,
+ utf16le_len_chars(strm->stream_name));
+ path_modified = true;
+ ret = supersede_file_or_stream(ctx, &h);
+ if (ret)
+ break;
+ (*func_NtClose)(h);
+ }
+ /* Restore the path to the dentry itself */
+ if (path_modified)
+ build_extraction_path(dentry, ctx);
+ return ret;
+}
+
+/*
+ * Creates the directory named by @dentry, or uses an existing directory at that
+ * location. If necessary, sets the short name and/or fixes compression and
+ * encryption attributes.
+ *
+ * Returns 0, WIMLIB_ERR_MKDIR, or WIMLIB_ERR_SET_SHORT_NAME.
+ */
+static int
+create_directory(const struct wim_dentry *dentry, struct win32_apply_ctx *ctx)
+{
+ DWORD perms;
+ NTSTATUS status;
+ HANDLE h;
+ int ret;
+
+ /* DELETE is needed for set_short_name(); GENERIC_READ and GENERIC_WRITE
+ * are needed for adjust_compression_attribute(). */
+ perms = GENERIC_READ | GENERIC_WRITE;
+ if (!dentry_is_root(dentry))
+ perms |= DELETE;
+
+ /* FILE_ATTRIBUTE_SYSTEM is needed to ensure that
+ * FILE_ATTRIBUTE_ENCRYPTED doesn't get set before we want it to be. */
+ status = create_file(&h, perms, NULL, FILE_ATTRIBUTE_SYSTEM,
+ FILE_OPEN_IF, FILE_DIRECTORY_FILE, dentry, ctx);
+ if (!NT_SUCCESS(status)) {
+ winnt_error(status, L"Can't create directory \"%ls\"",
+ current_path(ctx));
+ return WIMLIB_ERR_MKDIR;
+ }
+
+ if (ctx->iosb.Information == FILE_OPENED) {
+ /* If we opened an existing directory, try to clear its file
+ * attributes. As far as I know, this only actually makes a
+ * difference in the case where a FILE_ATTRIBUTE_READONLY
+ * directory has a named data stream which needs to be
+ * extracted. You cannot create a named data stream of such a
+ * directory, even though this contradicts Microsoft's
+ * documentation for FILE_ATTRIBUTE_READONLY which states it is
+ * not honored for directories! */
+ FILE_BASIC_INFORMATION basic_info = { .FileAttributes = FILE_ATTRIBUTE_NORMAL };
+ (*func_NtSetInformationFile)(h, &ctx->iosb, &basic_info,
+ sizeof(basic_info), FileBasicInformation);
+ }
+
+ if (!dentry_is_root(dentry)) {
+ ret = set_short_name(h, dentry, ctx);
+ if (ret)
+ goto out;
+ }
+
+ ret = adjust_compression_attribute(h, dentry, ctx);
+out:
+ (*func_NtClose)(h);
+ return ret;
+}
+
+/*
+ * Create all the directories being extracted, other than the target directory
+ * itself.
+ *
+ * Note: we don't honor directory hard links. However, we don't allow them to
+ * exist in WIM images anyway (see inode_fixup.c).
+ */
+static int
+create_directories(struct list_head *dentry_list,
+ struct win32_apply_ctx *ctx)
+{
+ const struct wim_dentry *dentry;
+ int ret;
+
+ list_for_each_entry(dentry, dentry_list, d_extraction_list_node) {
+
+ if (!(dentry->d_inode->i_attributes & FILE_ATTRIBUTE_DIRECTORY))
+ continue;
+
+ /* Note: Here we include files with
+ * FILE_ATTRIBUTE_DIRECTORY|FILE_ATTRIBUTE_REPARSE_POINT, but we
+ * wait until later to actually set the reparse data. */
+
+ ret = create_directory(dentry, ctx);
+
+ if (!ret)
+ ret = create_empty_named_data_streams(dentry, ctx);
+
+ ret = check_apply_error(dentry, ctx, ret);
+ if (ret)
+ return ret;
+
+ ret = report_file_created(&ctx->common);
+ if (ret)
+ return ret;
+ }
+ return 0;
+}
+
+/*
+ * Creates the nondirectory file named by @dentry.
+ *
+ * On success, returns an open handle to the file in @h_ret, with GENERIC_READ,
+ * GENERIC_WRITE, and DELETE access. Also, the path to the file will be saved
+ * in ctx->pathbuf. On failure, returns an error code.
+ */
+static int
+create_nondirectory_inode(HANDLE *h_ret, const struct wim_dentry *dentry,
+ struct win32_apply_ctx *ctx)
+{
+ int ret;
+ HANDLE h;
+
+ build_extraction_path(dentry, ctx);
+
+ ret = supersede_file_or_stream(ctx, &h);
+ if (ret)
+ goto out;
+
+ ret = adjust_compression_attribute(h, dentry, ctx);
+ if (ret)
+ goto out_close;
+
+ ret = create_empty_named_data_streams(dentry, ctx);
+ if (ret)
+ goto out_close;
+
+ *h_ret = h;
+ return 0;
+
+out_close:
+ (*func_NtClose)(h);
+out:
+ return ret;
+}
+
+/* Creates a hard link at the location named by @dentry to the file represented
+ * by the open handle @h. Or, if the target volume does not support hard links,
+ * create a separate file instead. */
+static int
+create_link(HANDLE h, const struct wim_dentry *dentry,
+ struct win32_apply_ctx *ctx)
+{
+ if (ctx->common.supported_features.hard_links) {
+
+ build_extraction_path(dentry, ctx);
+
+ size_t bufsize = offsetof(FILE_LINK_INFORMATION, FileName) +
+ ctx->pathbuf.Length + sizeof(wchar_t);
+ u8 buf[bufsize] _aligned_attribute(8);
+ FILE_LINK_INFORMATION *info = (FILE_LINK_INFORMATION *)buf;
+ NTSTATUS status;
+
+ info->ReplaceIfExists = TRUE;
+ info->RootDirectory = ctx->attr.RootDirectory;
+ info->FileNameLength = ctx->pathbuf.Length;
+ memcpy(info->FileName, ctx->pathbuf.Buffer, ctx->pathbuf.Length);
+ info->FileName[info->FileNameLength / 2] = L'\0';
+
+ /* Note: the null terminator isn't actually necessary,
+ * but if you don't add the extra character, you get
+ * STATUS_INFO_LENGTH_MISMATCH when FileNameLength
+ * happens to be 2 */
+
+ status = (*func_NtSetInformationFile)(h, &ctx->iosb,
+ info, bufsize,
+ FileLinkInformation);
+ if (NT_SUCCESS(status))
+ return 0;
+ winnt_error(status, L"Failed to create link \"%ls\"",
+ current_path(ctx));
+ return WIMLIB_ERR_LINK;
+ } else {
+ HANDLE h2;
+ int ret;
+
+ ret = create_nondirectory_inode(&h2, dentry, ctx);
+ if (ret)
+ return ret;
+
+ (*func_NtClose)(h2);
+ return 0;
+ }
+}
+
+/* Given an inode (represented by the open handle @h) for which one link has
+ * been created (named by @first_dentry), create the other links.
+ *
+ * Or, if the target volume does not support hard links, create separate files.
+ *
+ * Note: This uses ctx->pathbuf and does not reset it.
+ */
+static int
+create_links(HANDLE h, const struct wim_dentry *first_dentry,
+ struct win32_apply_ctx *ctx)
+{
+ const struct wim_inode *inode = first_dentry->d_inode;
+ const struct wim_dentry *dentry;
+ int ret;
+
+ inode_for_each_extraction_alias(dentry, inode) {
+ if (dentry != first_dentry) {
+ ret = create_link(h, dentry, ctx);
+ if (ret)
+ return ret;
+ }
+ }
+ return 0;
+}
+
+/* Create a nondirectory file, including all links. */
+static int
+create_nondirectory(struct wim_inode *inode, struct win32_apply_ctx *ctx)
+{
+ struct wim_dentry *first_dentry;
+ HANDLE h;
+ int ret;
+
+ first_dentry = first_extraction_alias(inode);
+
+ /* Create first link. */
+ ret = create_nondirectory_inode(&h, first_dentry, ctx);
+ if (ret)
+ return ret;
+
+ /* Set short name. */
+ ret = set_short_name(h, first_dentry, ctx);
+
+ /* Create additional links, OR if hard links are not supported just
+ * create more files. */
+ if (!ret)
+ ret = create_links(h, first_dentry, ctx);
+
+ /* "WIMBoot" extraction: set external backing by the WIM file if needed. */
+ if (!ret && unlikely(ctx->common.extract_flags & WIMLIB_EXTRACT_FLAG_WIMBOOT))
+ ret = set_external_backing(h, inode, ctx);
+
+ (*func_NtClose)(h);
+ return ret;
+}
+
+/* Create all the nondirectory files being extracted, including all aliases
+ * (hard links). */
+static int
+create_nondirectories(struct list_head *dentry_list, struct win32_apply_ctx *ctx)
+{
+ struct wim_dentry *dentry;
+ struct wim_inode *inode;
+ int ret;
+
+ list_for_each_entry(dentry, dentry_list, d_extraction_list_node) {
+ inode = dentry->d_inode;
+ if (inode->i_attributes & FILE_ATTRIBUTE_DIRECTORY)
+ continue;
+ /* Call create_nondirectory() only once per inode */
+ if (dentry == inode_first_extraction_dentry(inode)) {
+ ret = create_nondirectory(inode, ctx);
+ ret = check_apply_error(dentry, ctx, ret);
+ if (ret)
+ return ret;
+ }
+ ret = report_file_created(&ctx->common);
+ if (ret)
+ return ret;
+ }
+ return 0;
+}
+
+static void
+close_handles(struct win32_apply_ctx *ctx)
+{
+ for (unsigned i = 0; i < ctx->num_open_handles; i++)
+ (*func_NtClose)(ctx->open_handles[i]);
+}
+
+/* Prepare to read the next blob, which has size @blob_size, into an in-memory
+ * buffer. */
+static bool
+prepare_data_buffer(struct win32_apply_ctx *ctx, u64 blob_size)
+{
+ if (blob_size > ctx->data_buffer_size) {
+ /* Larger buffer needed. */
+ void *new_buffer;
+ if ((size_t)blob_size != blob_size)
+ return false;
+ new_buffer = REALLOC(ctx->data_buffer, blob_size);
+ if (!new_buffer)
+ return false;
+ ctx->data_buffer = new_buffer;
+ ctx->data_buffer_size = blob_size;
+ }
+ /* On the first call this changes data_buffer_ptr from NULL, which tells
+ * extract_chunk() that the data buffer needs to be filled while reading
+ * the stream data. */
+ ctx->data_buffer_ptr = ctx->data_buffer;
+ return true;
+}
+
+static int
+begin_extract_blob_instance(const struct blob_descriptor *blob,
+ struct wim_dentry *dentry,
+ const struct wim_inode_stream *strm,
+ struct win32_apply_ctx *ctx)
+{
+ FILE_ALLOCATION_INFORMATION alloc_info;
+ HANDLE h;
+ NTSTATUS status;
+
+ if (unlikely(strm->stream_type == STREAM_TYPE_REPARSE_POINT)) {
+ /* We can't write the reparse point stream directly; we must set
+ * it with FSCTL_SET_REPARSE_POINT, which requires that all the
+ * data be available. So, stage the data in a buffer. */
+ if (!prepare_data_buffer(ctx, blob->size))
+ return WIMLIB_ERR_NOMEM;
+ list_add_tail(&dentry->d_tmp_list, &ctx->reparse_dentries);
+ return 0;
+ }
+
+ if (unlikely(strm->stream_type == STREAM_TYPE_EFSRPC_RAW_DATA)) {
+ /* We can't write encrypted files directly; we must use
+ * WriteEncryptedFileRaw(), which requires providing the data
+ * through a callback function. This can't easily be combined
+ * with our own callback-based approach.
+ *
+ * The current workaround is to simply read the blob into memory
+ * and write the encrypted file from that.
+ *
+ * TODO: This isn't sufficient for extremely large encrypted
+ * files. Perhaps we should create an extra thread to write
+ * such files... */
+ if (!prepare_data_buffer(ctx, blob->size))
+ return WIMLIB_ERR_NOMEM;
+ list_add_tail(&dentry->d_tmp_list, &ctx->encrypted_dentries);
+ return 0;
+ }