67 lines
2.2 KiB
C
67 lines
2.2 KiB
C
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/*-
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* Copyright (c) 2003-2017 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_DECODER_H_
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#define _BER_DECODER_H_
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#include <asn_application.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct asn_TYPE_descriptor_s; /* Forward declaration */
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struct asn_codec_ctx_s; /* Forward declaration */
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/*
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* The BER decoder of any type.
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* This function may be invoked directly from the application.
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* Decodes BER, DER and CER data (DER and CER are different subsets of BER).
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*
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* NOTE: Use the der_encode() function (der_encoder.h) to produce encoding
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* which is compliant with ber_decode().
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*/
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asn_dec_rval_t ber_decode(
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const struct asn_codec_ctx_s *opt_codec_ctx,
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const struct asn_TYPE_descriptor_s *type_descriptor,
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void **struct_ptr, /* Pointer to a target structure's pointer */
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const void *buffer, /* Data to be decoded */
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size_t size /* Size of that buffer */
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);
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/*
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* Type of generic function which decodes the byte stream into the structure.
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*/
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typedef asn_dec_rval_t(ber_type_decoder_f)(
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const struct asn_codec_ctx_s *opt_codec_ctx,
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const struct asn_TYPE_descriptor_s *type_descriptor, void **struct_ptr,
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const void *buf_ptr, size_t size, int tag_mode);
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/*******************************
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* INTERNALLY USEFUL FUNCTIONS *
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*******************************/
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/*
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* Check that all tags correspond to the type definition (as given in head).
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* On return, last_length would contain either a non-negative length of the
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* value part of the last TLV, or the negative number of expected
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* "end of content" sequences. The number may only be negative if the
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* head->last_tag_form is non-zero.
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*/
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asn_dec_rval_t ber_check_tags(
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const struct asn_codec_ctx_s *opt_codec_ctx, /* codec options */
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const struct asn_TYPE_descriptor_s *type_descriptor,
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asn_struct_ctx_t *opt_ctx, /* saved decoding context */
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const void *ptr, size_t size,
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int tag_mode, /* {-1,0,1}: IMPLICIT, no, EXPLICIT */
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int last_tag_form, /* {-1,0:1}: any, primitive, constr */
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ber_tlv_len_t *last_length, int *opt_tlv_form /* optional tag form */
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);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _BER_DECODER_H_ */
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