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[crypto] Allow for parsing of partial ASN.1 cursors

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Allow code to create a partial ASN.1 cursor containing only the type
and length bytes, so that asn1_start() may be used to determine the
length of a large ASN.1 blob without first allocating memory to hold
the entire blob.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2016-07-28 15:02:15 +01:00
parent 5846ce2e9e
commit 296670a648
2 changed files with 9 additions and 6 deletions
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2
src/include/ipxe/asn1.h
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@@ -337,6 +337,8 @@ asn1_type ( const struct asn1_cursor *cursor ) {
return ( ( cursor->len >= sizeof ( *type ) ) ? *type : ASN1_END );
}
extern int asn1_start ( struct asn1_cursor *cursor, unsigned int type,
size_t extra );
extern int asn1_enter ( struct asn1_cursor *cursor, unsigned int type );
extern int asn1_skip_if_exists ( struct asn1_cursor *cursor,
unsigned int type );