diff options
Diffstat (limited to 'src/crypto')
| -rw-r--r-- | src/crypto/asn1.c | 42 |
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 ); |