mirror of https://gerrit.osmocom.org/asn1c
79 lines
2.4 KiB
C
79 lines
2.4 KiB
C
/*
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* Copyright (c) 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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#include <asn_internal.h>
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/*
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* The OER encoder of any type.
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*/
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asn_enc_rval_t
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oer_encode(asn_TYPE_descriptor_t *type_descriptor, void *struct_ptr,
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asn_app_consume_bytes_f *consume_bytes, void *app_key) {
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ASN_DEBUG("OER encoder invoked for %s",
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type_descriptor->name);
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/*
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* Invoke type-specific encoder.
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*/
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return type_descriptor->oer_encoder(type_descriptor, 0,
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struct_ptr, /* Pointer to the destination structure */
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consume_bytes, app_key);
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}
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/*
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* Argument type and callback necessary for oer_encode_to_buffer().
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*/
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typedef struct enc_to_buf_arg {
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void *buffer;
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size_t left;
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} enc_to_buf_arg;
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static int encode_to_buffer_cb(const void *buffer, size_t size, void *key) {
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enc_to_buf_arg *arg = (enc_to_buf_arg *)key;
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if(arg->left < size)
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return -1; /* Data exceeds the available buffer size */
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memcpy(arg->buffer, buffer, size);
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arg->buffer = ((char *)arg->buffer) + size;
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arg->left -= size;
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return 0;
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}
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/*
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* A variant of the oer_encode() which encodes the data into the provided buffer
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*/
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asn_enc_rval_t
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oer_encode_to_buffer(struct asn_TYPE_descriptor_s *type_descriptor,
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const asn_oer_constraints_t *constraints,
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void *struct_ptr, /* Structure to be encoded */
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void *buffer, /* Pre-allocated buffer */
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size_t buffer_size /* Initial buffer size (maximum) */
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) {
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enc_to_buf_arg arg;
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asn_enc_rval_t ec;
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arg.buffer = buffer;
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arg.left = buffer_size;
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if(type_descriptor->oer_encoder == NULL) {
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ec.encoded = -1;
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ec.failed_type = type_descriptor;
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ec.structure_ptr = struct_ptr;
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ASN_DEBUG("OER encoder is not defined for %s",
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type_descriptor->name);
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} else {
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ec = type_descriptor->oer_encoder(
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type_descriptor, constraints,
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struct_ptr, /* Pointer to the destination structure */
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encode_to_buffer_cb, &arg);
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if(ec.encoded != -1) {
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assert(ec.encoded == (ssize_t)(buffer_size - arg.left));
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/* Return the encoded contents size */
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}
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}
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return ec;
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}
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