1 files changed, 279 insertions, 0 deletions
diff --git a/qemu/roms/ipxe/src/core/downloader.c b/qemu/roms/ipxe/src/core/downloader.c
new file mode 100644
index 000000000..ec69db6b1
--- /dev/null
+++ b/qemu/roms/ipxe/src/core/downloader.c
@@ -0,0 +1,279 @@
+/*
+ * Copyright (C) 2007 Michael Brown <mbrown@fensystems.co.uk>.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+#include <stdlib.h>
+#include <errno.h>
+#include <syslog.h>
+#include <ipxe/iobuf.h>
+#include <ipxe/xfer.h>
+#include <ipxe/open.h>
+#include <ipxe/job.h>
+#include <ipxe/uaccess.h>
+#include <ipxe/umalloc.h>
+#include <ipxe/image.h>
+#include <ipxe/profile.h>
+#include <ipxe/downloader.h>
+
+/** @file
+ *
+ * Image downloader
+ *
+ */
+
+/** Receive profiler */
+static struct profiler downloader_rx_profiler __profiler =
+	{ .name = "downloader.rx" };
+
+/** Data copy profiler */
+static struct profiler downloader_copy_profiler __profiler =
+	{ .name = "downloader.copy" };
+
+/** A downloader */
+struct downloader {
+	/** Reference count for this object */
+	struct refcnt refcnt;
+
+	/** Job control interface */
+	struct interface job;
+	/** Data transfer interface */
+	struct interface xfer;
+
+	/** Image to contain downloaded file */
+	struct image *image;
+	/** Current position within image buffer */
+	size_t pos;
+};
+
+/**
+ * Free downloader object
+ *
+ * @v refcnt		Downloader reference counter
+ */
+static void downloader_free ( struct refcnt *refcnt ) {
+	struct downloader *downloader =
+		container_of ( refcnt, struct downloader, refcnt );
+
+	image_put ( downloader->image );
+	free ( downloader );
+}
+
+/**
+ * Terminate download
+ *
+ * @v downloader	Downloader
+ * @v rc		Reason for termination
+ */
+static void downloader_finished ( struct downloader *downloader, int rc ) {
+
+	/* Log download status */
+	if ( rc == 0 ) {
+		syslog ( LOG_NOTICE, "Downloaded \"%s\"\n",
+			 downloader->image->name );
+	} else {
+		syslog ( LOG_ERR, "Download of \"%s\" failed: %s\n",
+			 downloader->image->name, strerror ( rc ) );
+	}
+
+	/* Shut down interfaces */
+	intf_shutdown ( &downloader->xfer, rc );
+	intf_shutdown ( &downloader->job, rc );
+}
+
+/**
+ * Ensure that download buffer is large enough for the specified size
+ *
+ * @v downloader	Downloader
+ * @v len		Required minimum size
+ * @ret rc		Return status code
+ */
+static int downloader_ensure_size ( struct downloader *downloader,
+				    size_t len ) {
+	userptr_t new_buffer;
+
+	/* If buffer is already large enough, do nothing */
+	if ( len <= downloader->image->len )
+		return 0;
+
+	DBGC ( downloader, "Downloader %p extending to %zd bytes\n",
+	       downloader, len );
+
+	/* Extend buffer */
+	new_buffer = urealloc ( downloader->image->data, len );
+	if ( ! new_buffer ) {
+		DBGC ( downloader, "Downloader %p could not extend buffer to "
+		       "%zd bytes\n", downloader, len );
+		return -ENOSPC;
+	}
+	downloader->image->data = new_buffer;
+	downloader->image->len = len;
+
+	return 0;
+}
+
+/****************************************************************************
+ *
+ * Job control interface
+ *
+ */
+
+/**
+ * Report progress of download job
+ *
+ * @v downloader	Downloader
+ * @v progress		Progress report to fill in
+ * @ret ongoing_rc	Ongoing job status code (if known)
+ */
+static int downloader_progress ( struct downloader *downloader,
+				 struct job_progress *progress ) {
+
+	/* This is not entirely accurate, since downloaded data may
+	 * arrive out of order (e.g. with multicast protocols), but
+	 * it's a reasonable first approximation.
+	 */
+	progress->completed = downloader->pos;
+	progress->total = downloader->image->len;
+
+	return 0;
+}
+
+/****************************************************************************
+ *
+ * Data transfer interface
+ *
+ */
+
+/**
+ * Handle received data
+ *
+ * @v downloader	Downloader
+ * @v iobuf		Datagram I/O buffer
+ * @v meta		Data transfer metadata
+ * @ret rc		Return status code
+ */
+static int downloader_xfer_deliver ( struct downloader *downloader,
+				     struct io_buffer *iobuf,
+				     struct xfer_metadata *meta ) {
+	size_t len;
+	size_t max;
+	int rc;
+
+	/* Start profiling */
+	profile_start ( &downloader_rx_profiler );
+
+	/* Calculate new buffer position */
+	if ( meta->flags & XFER_FL_ABS_OFFSET )
+		downloader->pos = 0;
+	downloader->pos += meta->offset;
+
+	/* Ensure that we have enough buffer space for this data */
+	len = iob_len ( iobuf );
+	max = ( downloader->pos + len );
+	if ( ( rc = downloader_ensure_size ( downloader, max ) ) != 0 )
+		goto done;
+
+	/* Copy data to buffer */
+	profile_start ( &downloader_copy_profiler );
+	copy_to_user ( downloader->image->data, downloader->pos,
+		       iobuf->data, len );
+	profile_stop ( &downloader_copy_profiler );
+
+	/* Update current buffer position */
+	downloader->pos += len;
+
+ done:
+	free_iob ( iobuf );
+	if ( rc != 0 )
+		downloader_finished ( downloader, rc );
+	profile_stop ( &downloader_rx_profiler );
+	return rc;
+}
+
+/** Downloader data transfer interface operations */
+static struct interface_operation downloader_xfer_operations[] = {
+	INTF_OP ( xfer_deliver, struct downloader *, downloader_xfer_deliver ),
+	INTF_OP ( intf_close, struct downloader *, downloader_finished ),
+};
+
+/** Downloader data transfer interface descriptor */
+static struct interface_descriptor downloader_xfer_desc =
+	INTF_DESC ( struct downloader, xfer, downloader_xfer_operations );
+
+/****************************************************************************
+ *
+ * Job control interface
+ *
+ */
+
+/** Downloader job control interface operations */
+static struct interface_operation downloader_job_op[] = {
+	INTF_OP ( job_progress, struct downloader *, downloader_progress ),
+	INTF_OP ( intf_close, struct downloader *, downloader_finished ),
+};
+
+/** Downloader job control interface descriptor */
+static struct interface_descriptor downloader_job_desc =
+	INTF_DESC ( struct downloader, job, downloader_job_op );
+
+/****************************************************************************
+ *
+ * Instantiator
+ *
+ */
+
+/**
+ * Instantiate a downloader
+ *
+ * @v job		Job control interface
+ * @v image		Image to fill with downloaded file
+ * @ret rc		Return status code
+ *
+ * Instantiates a downloader object to download the content of the
+ * specified image from its URI.
+ */
+int create_downloader ( struct interface *job, struct image *image ) {
+	struct downloader *downloader;
+	int rc;
+
+	/* Allocate and initialise structure */
+	downloader = zalloc ( sizeof ( *downloader ) );
+	if ( ! downloader )
+		return -ENOMEM;
+	ref_init ( &downloader->refcnt, downloader_free );
+	intf_init ( &downloader->job, &downloader_job_desc,
+		    &downloader->refcnt );
+	intf_init ( &downloader->xfer, &downloader_xfer_desc,
+		    &downloader->refcnt );
+	downloader->image = image_get ( image );
+
+	/* Instantiate child objects and attach to our interfaces */
+	if ( ( rc = xfer_open_uri ( &downloader->xfer, image->uri ) ) != 0 )
+		goto err;
+
+	/* Attach parent interface, mortalise self, and return */
+	intf_plug_plug ( &downloader->job, job );
+	ref_put ( &downloader->refcnt );
+	return 0;
+
+ err:
+	downloader_finished ( downloader, rc );
+	ref_put ( &downloader->refcnt );
+	return rc;
+}