From de4f31cdcad7c4734c68da828351eeb7afd0360e Mon Sep 17 00:00:00 2001
From: Michael Brown <mcb30@ipxe.org>
Date: Thu, 6 May 2021 13:09:30 +0100
Subject: [image] Provide image_set_len() utility function

Signed-off-by: Michael Brown <mcb30@ipxe.org>
---
 src/core/image.c         | 25 +++++++++++++++++++++----
 src/include/ipxe/image.h |  1 +
 2 files changed, 22 insertions(+), 4 deletions(-)

diff --git a/src/core/image.c b/src/core/image.c
index 9fe77c5..ce8cf86 100644
--- a/src/core/image.c
+++ b/src/core/image.c
@@ -176,14 +176,13 @@ int image_set_cmdline ( struct image *image, const char *cmdline ) {
 }
 
 /**
- * Set image data
+ * Set image length
  *
  * @v image		Image
- * @v data		Image data
  * @v len		Length of image data
  * @ret rc		Return status code
  */
-int image_set_data ( struct image *image, userptr_t data, size_t len ) {
+int image_set_len ( struct image *image, size_t len ) {
 	userptr_t new;
 
 	/* (Re)allocate image data */
@@ -191,10 +190,28 @@ int image_set_data ( struct image *image, userptr_t data, size_t len ) {
 	if ( ! new )
 		return -ENOMEM;
 	image->data = new;
+	image->len = len;
+
+	return 0;
+}
+
+/**
+ * Set image data
+ *
+ * @v image		Image
+ * @v data		Image data
+ * @v len		Length of image data
+ * @ret rc		Return status code
+ */
+int image_set_data ( struct image *image, userptr_t data, size_t len ) {
+	int rc;
+
+	/* Set image length */
+	if ( ( rc = image_set_len ( image, len ) ) != 0 )
+		return rc;
 
 	/* Copy in new image data */
 	memcpy_user ( image->data, 0, data, 0, len );
-	image->len = len;
 
 	return 0;
 }
diff --git a/src/include/ipxe/image.h b/src/include/ipxe/image.h
index 4fd2700..046edf9 100644
--- a/src/include/ipxe/image.h
+++ b/src/include/ipxe/image.h
@@ -175,6 +175,7 @@ extern struct image * alloc_image ( struct uri *uri );
 extern int image_set_uri ( struct image *image, struct uri *uri );
 extern int image_set_name ( struct image *image, const char *name );
 extern int image_set_cmdline ( struct image *image, const char *cmdline );
+extern int image_set_len ( struct image *image, size_t len );
 extern int image_set_data ( struct image *image, userptr_t data, size_t len );
 extern int register_image ( struct image *image );
 extern void unregister_image ( struct image *image );
-- 
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