| /* |
| * Copyright (c) 2017 Lev Walkin <vlm@lionet.info>. All rights reserved. |
| * Redistribution and modifications are permitted subject to BSD license. |
| */ |
| #include <asn_internal.h> |
| |
| /* |
| * The OER encoder of any type. |
| */ |
| asn_enc_rval_t |
| oer_encode(asn_TYPE_descriptor_t *type_descriptor, void *struct_ptr, |
| asn_app_consume_bytes_f *consume_bytes, void *app_key) { |
| |
| ASN_DEBUG("OER encoder invoked for %s", |
| type_descriptor->name); |
| |
| /* |
| * Invoke type-specific encoder. |
| */ |
| return type_descriptor->op->oer_encoder(type_descriptor, 0, |
| struct_ptr, /* Pointer to the destination structure */ |
| consume_bytes, app_key); |
| } |
| |
| /* |
| * Argument type and callback necessary for oer_encode_to_buffer(). |
| */ |
| typedef struct enc_to_buf_arg { |
| void *buffer; |
| size_t left; |
| } enc_to_buf_arg; |
| static int encode_to_buffer_cb(const void *buffer, size_t size, void *key) { |
| enc_to_buf_arg *arg = (enc_to_buf_arg *)key; |
| |
| if(arg->left < size) |
| return -1; /* Data exceeds the available buffer size */ |
| |
| memcpy(arg->buffer, buffer, size); |
| arg->buffer = ((char *)arg->buffer) + size; |
| arg->left -= size; |
| |
| return 0; |
| } |
| |
| /* |
| * A variant of the oer_encode() which encodes the data into the provided buffer |
| */ |
| asn_enc_rval_t |
| oer_encode_to_buffer(struct asn_TYPE_descriptor_s *type_descriptor, |
| const asn_oer_constraints_t *constraints, |
| void *struct_ptr, /* Structure to be encoded */ |
| void *buffer, /* Pre-allocated buffer */ |
| size_t buffer_size /* Initial buffer size (maximum) */ |
| ) { |
| enc_to_buf_arg arg; |
| asn_enc_rval_t ec; |
| |
| arg.buffer = buffer; |
| arg.left = buffer_size; |
| |
| if(type_descriptor->op->oer_encoder == NULL) { |
| ec.encoded = -1; |
| ec.failed_type = type_descriptor; |
| ec.structure_ptr = struct_ptr; |
| ASN_DEBUG("OER encoder is not defined for %s", |
| type_descriptor->name); |
| } else { |
| ec = type_descriptor->op->oer_encoder( |
| type_descriptor, constraints, |
| struct_ptr, /* Pointer to the destination structure */ |
| encode_to_buffer_cb, &arg); |
| if(ec.encoded != -1) { |
| assert(ec.encoded == (ssize_t)(buffer_size - arg.left)); |
| /* Return the encoded contents size */ |
| } |
| } |
| return ec; |
| } |