diff options
Diffstat (limited to 'skeletons/ber_tlv_tag.h')
-rw-r--r-- | skeletons/ber_tlv_tag.h | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/skeletons/ber_tlv_tag.h b/skeletons/ber_tlv_tag.h new file mode 100644 index 00000000..50419702 --- /dev/null +++ b/skeletons/ber_tlv_tag.h @@ -0,0 +1,52 @@ +/*- + * Copyright (c) 2003, 2004 Lev Walkin <vlm@lionet.info>. All rights reserved. + * Redistribution and modifications are permitted subject to BSD license. + */ +#ifndef _BER_TLV_TAG_H_ +#define _BER_TLV_TAG_H_ + +enum asn_tag_class { + ASN_TAG_CLASS_UNIVERSAL = 0, /* 0b00 */ + ASN_TAG_CLASS_APPLICATION = 1, /* 0b01 */ + ASN_TAG_CLASS_CONTEXT = 2, /* 0b10 */ + ASN_TAG_CLASS_PRIVATE = 3, /* 0b11 */ +}; +typedef unsigned ber_tlv_tag_t; /* BER TAG from Tag-Length-Value */ + +/* + * Tag class is encoded together with tag value for optimization purposes. + */ +#define BER_TAG_CLASS(tag) ((tag) & 0x3) +#define BER_TAG_VALUE(tag) ((tag) >> 2) +#define BER_TLV_CONSTRUCTED(tagptr) (((*(uint8_t *)tagptr) & 0x20)?1:0) + +#define BER_TAGS_EQUAL(tag1, tag2) ((tag1) == (tag2)) + +/* + * Several functions for printing the TAG in the canonical form + * (i.e. "[PRIVATE 0]"). + * Return values correspond to their libc counterparts (if any). + */ +ssize_t ber_tlv_tag_snprint(ber_tlv_tag_t tag, char *buf, size_t buflen); +ssize_t ber_tlv_tag_fwrite(ber_tlv_tag_t tag, FILE *); +char *ber_tlv_tag_string(ber_tlv_tag_t tag); + + +/* + * This function tries to fetch the tag from the input stream. + * RETURN VALUES: + * 0: More data expected than bufptr contains. + * -1: Fatal error deciphering tag. + * >0: Number of bytes used from bufptr. tag_r will contain the tag. + */ +ssize_t ber_fetch_tag(void *bufptr, size_t size, ber_tlv_tag_t *tag_r); + +/* + * This function serializes the tag (T from TLV) in DER format. + * It always return number of bytes necessary to represent the tag, + * it is a caller's responsibility to check the return value + * against the supplied buffer's size. + */ +ssize_t der_tlv_tag_serialize(ber_tlv_tag_t tag, void *bufptr, size_t size); + +#endif /* _BER_TLV_TAG_H_ */ |