2 * Copyright (c) 2003, 2004 Lev Walkin <vlm@lionet.info>. All rights reserved.
3 * Redistribution and modifications are permitted subject to BSD license.
5 #ifndef _BER_DECODER_H_
6 #define _BER_DECODER_H_
8 #include <asn_application.h>
14 struct asn_TYPE_descriptor_s; /* Forward declaration */
15 struct asn_codec_ctx_s; /* Forward declaration */
18 * The BER decoder of any type.
19 * This function may be invoked directly from the application.
21 asn_dec_rval_t ber_decode(struct asn_codec_ctx_s *opt_codec_ctx,
22 struct asn_TYPE_descriptor_s *type_descriptor,
23 void **struct_ptr, /* Pointer to a target structure's pointer */
24 const void *buffer, /* Data to be decoded */
25 size_t size /* Size of that buffer */
29 * Type of generic function which decodes the byte stream into the structure.
31 typedef asn_dec_rval_t (ber_type_decoder_f)(
32 struct asn_codec_ctx_s *opt_codec_ctx,
33 struct asn_TYPE_descriptor_s *type_descriptor,
34 void **struct_ptr, const void *buf_ptr, size_t size,
37 /*******************************
38 * INTERNALLY USEFUL FUNCTIONS *
39 *******************************/
42 * Check that all tags correspond to the type definition (as given in head).
43 * On return, last_length would contain either a non-negative length of the
44 * value part of the last TLV, or the negative number of expected
45 * "end of content" sequences. The number may only be negative if the
46 * head->last_tag_form is non-zero.
48 asn_dec_rval_t ber_check_tags(
49 struct asn_codec_ctx_s *opt_codec_ctx, /* codec options */
50 struct asn_TYPE_descriptor_s *type_descriptor,
51 asn_struct_ctx_t *opt_ctx, /* saved decoding context */
52 const void *ptr, size_t size,
53 int tag_mode, /* {-1,0,1}: IMPLICIT, no, EXPLICIT */
54 int last_tag_form, /* {-1,0:1}: any, primitive, constr */
55 ber_tlv_len_t *last_length,
56 int *opt_tlv_form /* optional tag form */
63 #endif /* _BER_DECODER_H_ */