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