Lev Walkin | 4558ad0 | 2017-07-10 05:21:30 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2017 Lev Walkin <vlm@lionet.info>. All rights reserved. |
| 3 | * Redistribution and modifications are permitted subject to BSD license. |
| 4 | */ |
| 5 | #include <asn_internal.h> |
| 6 | |
| 7 | /* |
| 8 | * The OER encoder of any type. |
| 9 | */ |
| 10 | asn_enc_rval_t |
| 11 | oer_encode(asn_TYPE_descriptor_t *type_descriptor, void *struct_ptr, |
| 12 | asn_app_consume_bytes_f *consume_bytes, void *app_key) { |
| 13 | |
| 14 | ASN_DEBUG("OER encoder invoked for %s", |
| 15 | type_descriptor->name); |
| 16 | |
| 17 | /* |
| 18 | * Invoke type-specific encoder. |
| 19 | */ |
| 20 | return type_descriptor->oer_encoder(type_descriptor, 0, |
| 21 | struct_ptr, /* Pointer to the destination structure */ |
| 22 | consume_bytes, app_key); |
| 23 | } |
| 24 | |
| 25 | /* |
| 26 | * Argument type and callback necessary for oer_encode_to_buffer(). |
| 27 | */ |
| 28 | typedef struct enc_to_buf_arg { |
| 29 | void *buffer; |
| 30 | size_t left; |
| 31 | } enc_to_buf_arg; |
| 32 | static int encode_to_buffer_cb(const void *buffer, size_t size, void *key) { |
| 33 | enc_to_buf_arg *arg = (enc_to_buf_arg *)key; |
| 34 | |
| 35 | if(arg->left < size) |
| 36 | return -1; /* Data exceeds the available buffer size */ |
| 37 | |
| 38 | memcpy(arg->buffer, buffer, size); |
| 39 | arg->buffer = ((char *)arg->buffer) + size; |
| 40 | arg->left -= size; |
| 41 | |
| 42 | return 0; |
| 43 | } |
| 44 | |
| 45 | /* |
| 46 | * A variant of the oer_encode() which encodes the data into the provided buffer |
| 47 | */ |
| 48 | asn_enc_rval_t |
| 49 | oer_encode_to_buffer(struct asn_TYPE_descriptor_s *type_descriptor, |
| 50 | void *struct_ptr, /* Structure to be encoded */ |
| 51 | void *buffer, /* Pre-allocated buffer */ |
| 52 | size_t buffer_size /* Initial buffer size (maximum) */ |
| 53 | ) { |
| 54 | enc_to_buf_arg arg; |
| 55 | asn_enc_rval_t ec; |
| 56 | |
| 57 | arg.buffer = buffer; |
| 58 | arg.left = buffer_size; |
| 59 | |
| 60 | ec = type_descriptor->oer_encoder( |
| 61 | type_descriptor, 0, |
| 62 | struct_ptr, /* Pointer to the destination structure */ |
| 63 | encode_to_buffer_cb, &arg); |
| 64 | if(ec.encoded != -1) { |
| 65 | assert(ec.encoded == (ssize_t)(buffer_size - arg.left)); |
| 66 | /* Return the encoded contents size */ |
| 67 | } |
| 68 | return ec; |
| 69 | } |