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-rw-r--r--src/crypto/asn1.c42
1 files changed, 42 insertions, 0 deletions
diff --git a/src/crypto/asn1.c b/src/crypto/asn1.c
index 03eb18f7..ff56e1f3 100644
--- a/src/crypto/asn1.c
+++ b/src/crypto/asn1.c
@@ -31,6 +31,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <errno.h>
#include <time.h>
#include <ipxe/tables.h>
+#include <ipxe/image.h>
#include <ipxe/asn1.h>
/** @file
@@ -838,3 +839,44 @@ int asn1_wrap ( struct asn1_builder *builder, unsigned int type ) {
return 0;
}
+
+/**
+ * Extract ASN.1 object from image
+ *
+ * @v image Image
+ * @v offset Offset within image
+ * @v cursor ASN.1 cursor to fill in
+ * @ret next Offset to next image, or negative error
+ *
+ * The caller is responsible for eventually calling free() on the
+ * allocated ASN.1 cursor.
+ */
+int image_asn1 ( struct image *image, size_t offset,
+ struct asn1_cursor **cursor ) {
+ int next;
+ int rc;
+
+ /* Sanity check */
+ assert ( offset <= image->len );
+
+ /* Check that this image can be used to extract an ASN.1 object */
+ if ( ! ( image->type && image->type->asn1 ) )
+ return -ENOTSUP;
+
+ /* Try creating ASN.1 cursor */
+ next = image->type->asn1 ( image, offset, cursor );
+ if ( next < 0 ) {
+ rc = next;
+ DBGC ( image, "IMAGE %s could not extract ASN.1 object: %s\n",
+ image->name, strerror ( rc ) );
+ return rc;
+ }
+
+ return next;
+}
+
+/* Drag in objects via image_asn1() */
+REQUIRING_SYMBOL ( image_asn1 );
+
+/* Drag in ASN.1 image formats */
+REQUIRE_OBJECT ( config_asn1 );