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114 lines
4.0 KiB
C
114 lines
4.0 KiB
C
/* tlv.h - Tag-Length-Value Utilities
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* Copyright (C) 2004 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef SCD_TLV_H
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#define SCD_TLV_H 1
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enum tlv_tag_class {
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CLASS_UNIVERSAL = 0,
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CLASS_APPLICATION = 1,
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CLASS_CONTEXT = 2,
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CLASS_PRIVATE =3
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};
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enum tlv_tag_type {
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TAG_NONE = 0,
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TAG_BOOLEAN = 1,
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TAG_INTEGER = 2,
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TAG_BIT_STRING = 3,
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TAG_OCTET_STRING = 4,
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TAG_NULL = 5,
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TAG_OBJECT_ID = 6,
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TAG_OBJECT_DESCRIPTOR = 7,
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TAG_EXTERNAL = 8,
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TAG_REAL = 9,
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TAG_ENUMERATED = 10,
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TAG_EMBEDDED_PDV = 11,
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TAG_UTF8_STRING = 12,
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TAG_REALTIVE_OID = 13,
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TAG_SEQUENCE = 16,
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TAG_SET = 17,
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TAG_NUMERIC_STRING = 18,
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TAG_PRINTABLE_STRING = 19,
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TAG_TELETEX_STRING = 20,
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TAG_VIDEOTEX_STRING = 21,
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TAG_IA5_STRING = 22,
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TAG_UTC_TIME = 23,
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TAG_GENERALIZED_TIME = 24,
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TAG_GRAPHIC_STRING = 25,
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TAG_VISIBLE_STRING = 26,
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TAG_GENERAL_STRING = 27,
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TAG_UNIVERSAL_STRING = 28,
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TAG_CHARACTER_STRING = 29,
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TAG_BMP_STRING = 30
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};
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/* Locate a TLV encoded data object in BUFFER of LENGTH and return a
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pointer to value as well as its length in NBYTES. Return NULL if
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it was not found or if the object does not fit into the buffer. */
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const unsigned char *find_tlv (const unsigned char *buffer, size_t length,
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int tag, size_t *nbytes);
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/* Locate a TLV encoded data object in BUFFER of LENGTH and return a
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pointer to value as well as its length in NBYTES. Return NULL if
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it was not found. Note, that the function does not check whether
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the value fits into the provided buffer.*/
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const unsigned char *find_tlv_unchecked (const unsigned char *buffer,
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size_t length,
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int tag, size_t *nbytes);
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/* ASN.1 BER parser: Parse BUFFER of length SIZE and return the tag
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and the length part from the TLV triplet. Update BUFFER and SIZE
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on success. */
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gpg_error_t _parse_ber_header (unsigned char const **buffer, size_t *size,
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int *r_class, int *r_tag,
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int *r_constructed,
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int *r_ndef, size_t *r_length, size_t *r_nhdr,
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gpg_err_source_t errsource);
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#define parse_ber_header(a,b,c,d,e,f,g,h) \
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_parse_ber_header ((a),(b),(c),(d),(e),(f),(g),(h),\
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GPG_ERR_SOURCE_DEFAULT)
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/* Return the next token of an canconical encoded S-expression. BUF
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is the pointer to the S-expression and BUFLEN is a pointer to the
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length of this S-expression (used to validate the syntax). Both
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are updated to reflect the new position. The token itself is
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returned as a pointer into the orginal buffer at TOK and TOKLEN.
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If a parentheses is the next token, TOK will be set to NULL.
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TOKLEN is checked to be within the bounds. On error a error code
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is returned and all pointers should are not guaranteed to point to
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a meanigful value. DEPTH should be initialized to 0 and will
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reflect on return the actual depth of the tree. To detect the end
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of the S-expression it is advisable to check DEPTH after a
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successful return. */
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gpg_error_t _parse_sexp (unsigned char const **buf, size_t *buflen,
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int *depth, unsigned char const **tok, size_t *toklen,
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gpg_err_source_t errsource);
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#define parse_sexp(a,b,c,d,e) \
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_parse_sexp ((a),(b),(c),(d),(e), GPG_ERR_SOURCE_DEFAULT)
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#endif /* SCD_TLV_H */
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