1 files changed, 28 insertions, 0 deletions
diff --git a/src/lib/istream-seekable.h b/src/lib/istream-seekable.h
new file mode 100644
index 0000000..4cee396
--- /dev/null
+++ b/src/lib/istream-seekable.h
@@ -0,0 +1,28 @@
+#ifndef ISTREAM_SEEKABLE_H
+#define ISTREAM_SEEKABLE_H
+
+/* Create a seekable stream from given NULL-terminated list of input streams.
+   Try to keep it in memory, but use a temporary file if it's too large.
+
+   When max_buffer_size is reached, fd_callback is called. It should return
+   the fd and path of the created file. Typically the callback would also
+   unlink the file before returning. */
+struct istream *
+i_streams_merge(struct istream *input[], size_t max_buffer_size,
+		int (*fd_callback)(const char **path_r, void *context),
+		void *context) ATTR_NULL(4);
+
+/* Same as i_streams_merge(), but if all of the inputs are seekable already,
+   create a concat stream instead. */
+struct istream *
+i_stream_create_seekable(struct istream *input[],
+			 size_t max_buffer_size,
+			 int (*fd_callback)(const char **path_r, void *context),
+			 void *context) ATTR_NULL(4);
+
+struct istream *
+i_stream_create_seekable_path(struct istream *input[],
+			      size_t max_buffer_size,
+			      const char *temp_path_prefix);
+
+#endif