| /*- |
| * 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_ |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| 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) (((*(const 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(const void *bufptr, size_t size, ber_tlv_tag_t *tag_r); |
| |
| /* |
| * This function serializes the tag (T from TLV) in BER format. |
| * It always returns 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. |
| */ |
| size_t ber_tlv_tag_serialize(ber_tlv_tag_t tag, void *bufptr, size_t size); |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif /* _BER_TLV_TAG_H_ */ |