3 * Copyright (c) 2003-2017 Lev Walkin <vlm@lionet.info>. All rights reserved.
4 * Redistribution and modifications are permitted subject to BSD license.
6 #ifndef _BER_DECODER_H_
7 #define _BER_DECODER_H_
9 #include <asn_application.h>
15 struct asn_TYPE_descriptor_s; /* Forward declaration */
16 struct asn_codec_ctx_s; /* Forward declaration */
19 * The BER decoder of any type.
20 * This function may be invoked directly from the application.
21 * Decodes BER, DER and CER data (DER and CER are different subsets of BER).
23 * NOTE: Use the der_encode() function (der_encoder.h) to produce encoding
24 * which is compliant with ber_decode().
26 asn_dec_rval_t ber_decode(
27 const struct asn_codec_ctx_s *opt_codec_ctx,
28 const struct asn_TYPE_descriptor_s *type_descriptor,
29 void **struct_ptr, /* Pointer to a target structure's pointer */
30 const void *buffer, /* Data to be decoded */
31 size_t size /* Size of that buffer */
35 * Type of generic function which decodes the byte stream into the structure.
37 typedef asn_dec_rval_t(ber_type_decoder_f)(
38 const struct asn_codec_ctx_s *opt_codec_ctx,
39 const struct asn_TYPE_descriptor_s *type_descriptor, void **struct_ptr,
40 const void *buf_ptr, size_t size, int tag_mode);
42 /*******************************
43 * INTERNALLY USEFUL FUNCTIONS *
44 *******************************/
47 * Check that all tags correspond to the type definition (as given in head).
48 * On return, last_length would contain either a non-negative length of the
49 * value part of the last TLV, or the negative number of expected
50 * "end of content" sequences. The number may only be negative if the
51 * head->last_tag_form is non-zero.
53 asn_dec_rval_t ber_check_tags(
54 const struct asn_codec_ctx_s *opt_codec_ctx, /* codec options */
55 const struct asn_TYPE_descriptor_s *type_descriptor,
56 asn_struct_ctx_t *opt_ctx, /* saved decoding context */
57 const void *ptr, size_t size,
58 int tag_mode, /* {-1,0,1}: IMPLICIT, no, EXPLICIT */
59 int last_tag_form, /* {-1,0:1}: any, primitive, constr */
60 ber_tlv_len_t *last_length, int *opt_tlv_form /* optional tag form */
67 #endif /* _BER_DECODER_H_ */