Replacement for fetch() which operates asynchronously and identifies

protocols by URI scheme.

src/include/gpxe/download.h

@@ -0,0 +1,59 @@
+#ifndef _GPXE_DOWNLOAD_H
+#define _GPXE_DOWNLOAD_H
+
+/** @file
+ *
+ * Download protocols
+ *
+ */
+
+#include <stdint.h>
+#include <gpxe/uaccess.h>
+#include <gpxe/async.h>
+#include <gpxe/buffer.h>
+#include <gpxe/uri.h>
+#include <gpxe/tables.h>
+
+/** A download protocol */
+struct download_protocol {
+	/** Protocol name (e.g. "http") */ 
+	const char *name;
+	/** Start a download via this protocol
+	 *
+	 * @v uri		Uniform Resource Identifier
+	 * @v buffer		Buffer into which to download file
+	 * @v parent		Parent asynchronous operation
+	 * @ret rc		Return status code
+	 *
+	 * The @c uri and @c buffer will remain persistent for the
+	 * duration of the asynchronous operation.
+	 */
+	int ( * start_download ) ( struct uri *uri, struct buffer *buffer,
+				   struct async *parent );
+};
+
+/** Register a download protocol */
+#define __download_protocol __table ( struct download_protocol, \
+				      download_protocols, 01 )
+
+/** A download in progress */
+struct download {
+	/** User buffer allocated for the download */
+	userptr_t *data;
+	/** Size of the download */
+	size_t *len;
+
+	/** URI being downloaded */
+	struct uri *uri;
+	/** Expandable buffer for this download */
+	struct buffer buffer;
+	/** Download protocol */
+	struct download_protocol *protocol;
+	/** Asynchronous operation for this download */
+	struct async async;
+};
+
+extern int start_download ( const char *uri_string, struct async *parent,
+			    userptr_t *data, size_t *len );
+
+#endif /* _GPXE_DOWNLOAD_H */