109 lines
3.4 KiB
C
109 lines
3.4 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 ASN_CODECS_H
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#define ASN_CODECS_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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/*
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* This structure defines a set of parameters that may be passed
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* to every ASN.1 encoder or decoder function.
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* WARNING: if max_stack_size member is set, and you are calling the
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* function pointers of the asn_TYPE_descriptor_t directly,
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* this structure must be ALLOCATED ON THE STACK!
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* If you can't always satisfy this requirement, use ber_decode(),
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* xer_decode() and uper_decode() functions instead.
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*/
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typedef struct asn_codec_ctx_s {
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/*
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* Limit the decoder routines to use no (much) more stack than a given
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* number of bytes. Most of decoders are stack-based, and this
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* would protect against stack overflows if the number of nested
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* encodings is high.
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* The OCTET STRING, BIT STRING and ANY BER decoders are heap-based,
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* and are safe from this kind of overflow.
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* A value from getrlimit(RLIMIT_STACK) may be used to initialize
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* this variable. Be careful in multithreaded environments, as the
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* stack size is rather limited.
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*/
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size_t max_stack_size; /* 0 disables stack bounds checking */
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} asn_codec_ctx_t;
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/*
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* Type of the return value of the encoding functions (der_encode, xer_encode).
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*/
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typedef struct asn_enc_rval_s {
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/*
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* Number of bytes encoded.
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* -1 indicates failure to encode the structure.
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* In this case, the members below this one are meaningful.
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*/
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ssize_t encoded;
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/*
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* Members meaningful when (encoded == -1), for post mortem analysis.
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*/
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/* Type which cannot be encoded */
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const struct asn_TYPE_descriptor_s *failed_type;
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/* Pointer to the structure of that type */
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const void *structure_ptr;
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} asn_enc_rval_t;
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#define ASN__ENCODE_FAILED do { \
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asn_enc_rval_t tmp_error; \
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tmp_error.encoded = -1; \
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tmp_error.failed_type = td; \
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tmp_error.structure_ptr = sptr; \
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ASN_DEBUG("Failed to encode element %s", td ? td->name : ""); \
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return tmp_error; \
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} while(0)
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#define ASN__ENCODED_OK(rval) do { \
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rval.structure_ptr = 0; \
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rval.failed_type = 0; \
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return rval; \
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} while(0)
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/*
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* Type of the return value of the decoding functions (ber_decode, xer_decode)
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*
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* Please note that the number of consumed bytes is ALWAYS meaningful,
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* even if code==RC_FAIL. This is to indicate the number of successfully
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* decoded bytes, hence providing a possibility to fail with more diagnostics
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* (i.e., print the offending remainder of the buffer).
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*/
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enum asn_dec_rval_code_e {
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RC_OK, /* Decoded successfully */
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RC_WMORE, /* More data expected, call again */
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RC_FAIL /* Failure to decode data */
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};
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typedef struct asn_dec_rval_s {
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enum asn_dec_rval_code_e code; /* Result code */
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size_t consumed; /* Number of bytes consumed */
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} asn_dec_rval_t;
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#define ASN__DECODE_FAILED do { \
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asn_dec_rval_t tmp_error; \
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tmp_error.code = RC_FAIL; \
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tmp_error.consumed = 0; \
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ASN_DEBUG("Failed to decode element %s", td ? td->name : ""); \
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return tmp_error; \
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} while(0)
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#define ASN__DECODE_STARVED do { \
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asn_dec_rval_t tmp_error; \
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tmp_error.code = RC_WMORE; \
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tmp_error.consumed = 0; \
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return tmp_error; \
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} while(0)
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#ifdef __cplusplus
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}
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#endif
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#endif /* ASN_CODECS_H */
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