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simple-mbed-cloud-client/mbed-cloud-client/mbed-client/source/m2mtlvserializer.cpp@0:8f0bb79ddd48, 2021-05-04 (annotated)

Committer:
leothedragon
Date:
Tue May 04 08:55:12 2021 +0000
Revision:
0:8f0bb79ddd48
nmn

Who changed what in which revision?

UserRevisionLine numberNew contents of line
leothedragon 0:8f0bb79ddd48 1 /*
leothedragon 0:8f0bb79ddd48 2 * Copyright (c) 2015 ARM Limited. All rights reserved.
leothedragon 0:8f0bb79ddd48 3 * SPDX-License-Identifier: Apache-2.0
leothedragon 0:8f0bb79ddd48 4 * Licensed under the Apache License, Version 2.0 (the License); you may
leothedragon 0:8f0bb79ddd48 5 * not use this file except in compliance with the License.
leothedragon 0:8f0bb79ddd48 6 * You may obtain a copy of the License at
leothedragon 0:8f0bb79ddd48 7 *
leothedragon 0:8f0bb79ddd48 8 * http://www.apache.org/licenses/LICENSE-2.0
leothedragon 0:8f0bb79ddd48 9 *
leothedragon 0:8f0bb79ddd48 10 * Unless required by applicable law or agreed to in writing, software
leothedragon 0:8f0bb79ddd48 11 * distributed under the License is distributed on an AS IS BASIS, WITHOUT
leothedragon 0:8f0bb79ddd48 12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
leothedragon 0:8f0bb79ddd48 13 * See the License for the specific language governing permissions and
leothedragon 0:8f0bb79ddd48 14 * limitations under the License.
leothedragon 0:8f0bb79ddd48 15 */
leothedragon 0:8f0bb79ddd48 16 #include "include/m2mtlvserializer.h"
leothedragon 0:8f0bb79ddd48 17 #include "mbed-client/m2mconstants.h"
leothedragon 0:8f0bb79ddd48 18
leothedragon 0:8f0bb79ddd48 19 #include <stdlib.h>
leothedragon 0:8f0bb79ddd48 20 #include "common_functions.h"
leothedragon 0:8f0bb79ddd48 21
leothedragon 0:8f0bb79ddd48 22 #define TRACE_GROUP "mClt"
leothedragon 0:8f0bb79ddd48 23
leothedragon 0:8f0bb79ddd48 24 #define MAX_TLV_LENGTH_SIZE 3
leothedragon 0:8f0bb79ddd48 25 #define MAX_TLV_ID_SIZE 2
leothedragon 0:8f0bb79ddd48 26 #define TLV_TYPE_SIZE 1
leothedragon 0:8f0bb79ddd48 27
leothedragon 0:8f0bb79ddd48 28 uint8_t* M2MTLVSerializer::serialize(const M2MObjectInstanceList &object_instance_list, uint32_t &size)
leothedragon 0:8f0bb79ddd48 29 {
leothedragon 0:8f0bb79ddd48 30 return serialize_object_instances(object_instance_list, size);
leothedragon 0:8f0bb79ddd48 31 }
leothedragon 0:8f0bb79ddd48 32
leothedragon 0:8f0bb79ddd48 33 uint8_t* M2MTLVSerializer::serialize(const M2MResourceList &resource_list, uint32_t &size)
leothedragon 0:8f0bb79ddd48 34 {
leothedragon 0:8f0bb79ddd48 35 bool valid = true;
leothedragon 0:8f0bb79ddd48 36 return serialize_resources(resource_list, size,valid);
leothedragon 0:8f0bb79ddd48 37 }
leothedragon 0:8f0bb79ddd48 38
leothedragon 0:8f0bb79ddd48 39 uint8_t* M2MTLVSerializer::serialize(const M2MResource *resource, uint32_t &size)
leothedragon 0:8f0bb79ddd48 40 {
leothedragon 0:8f0bb79ddd48 41 uint8_t* data = NULL;
leothedragon 0:8f0bb79ddd48 42 serialize(resource, data, size);
leothedragon 0:8f0bb79ddd48 43 return data;
leothedragon 0:8f0bb79ddd48 44 }
leothedragon 0:8f0bb79ddd48 45
leothedragon 0:8f0bb79ddd48 46 uint8_t* M2MTLVSerializer::serialize_object_instances(const M2MObjectInstanceList &object_instance_list, uint32_t &size)
leothedragon 0:8f0bb79ddd48 47 {
leothedragon 0:8f0bb79ddd48 48 uint8_t *data = NULL;
leothedragon 0:8f0bb79ddd48 49
leothedragon 0:8f0bb79ddd48 50 if(!object_instance_list.empty()) {
leothedragon 0:8f0bb79ddd48 51 M2MObjectInstanceList::const_iterator it;
leothedragon 0:8f0bb79ddd48 52 it = object_instance_list.begin();
leothedragon 0:8f0bb79ddd48 53 for (; it!=object_instance_list.end(); it++) {
leothedragon 0:8f0bb79ddd48 54 uint16_t id = (*it)->instance_id();
leothedragon 0:8f0bb79ddd48 55 serialize(id, *it, data, size);
leothedragon 0:8f0bb79ddd48 56 }
leothedragon 0:8f0bb79ddd48 57 }
leothedragon 0:8f0bb79ddd48 58 return data;
leothedragon 0:8f0bb79ddd48 59 }
leothedragon 0:8f0bb79ddd48 60
leothedragon 0:8f0bb79ddd48 61 uint8_t* M2MTLVSerializer::serialize_resources(const M2MResourceList &resource_list, uint32_t &size, bool &valid)
leothedragon 0:8f0bb79ddd48 62 {
leothedragon 0:8f0bb79ddd48 63 uint8_t *data = NULL;
leothedragon 0:8f0bb79ddd48 64
leothedragon 0:8f0bb79ddd48 65 if(!resource_list.empty()) {
leothedragon 0:8f0bb79ddd48 66 M2MResourceList::const_iterator it;
leothedragon 0:8f0bb79ddd48 67 it = resource_list.begin();
leothedragon 0:8f0bb79ddd48 68 for (; it!=resource_list.end(); it++) {
leothedragon 0:8f0bb79ddd48 69 if((*it)->name_id() == -1) {
leothedragon 0:8f0bb79ddd48 70 valid = false;
leothedragon 0:8f0bb79ddd48 71 break;
leothedragon 0:8f0bb79ddd48 72 }
leothedragon 0:8f0bb79ddd48 73 }
leothedragon 0:8f0bb79ddd48 74 if(valid) {
leothedragon 0:8f0bb79ddd48 75 it = resource_list.begin();
leothedragon 0:8f0bb79ddd48 76 for (; it!=resource_list.end(); it++) {
leothedragon 0:8f0bb79ddd48 77 if (((*it)->operation() & M2MBase::GET_ALLOWED) == M2MBase::GET_ALLOWED) {
leothedragon 0:8f0bb79ddd48 78 if(!serialize(*it, data, size)) {
leothedragon 0:8f0bb79ddd48 79 /* serializing has failed */
leothedragon 0:8f0bb79ddd48 80 /* free data so far */
leothedragon 0:8f0bb79ddd48 81 free(data);
leothedragon 0:8f0bb79ddd48 82 /* invalidate */
leothedragon 0:8f0bb79ddd48 83 valid = false;
leothedragon 0:8f0bb79ddd48 84 /* return NULL immediately */
leothedragon 0:8f0bb79ddd48 85 return NULL;
leothedragon 0:8f0bb79ddd48 86 }
leothedragon 0:8f0bb79ddd48 87 }
leothedragon 0:8f0bb79ddd48 88 }
leothedragon 0:8f0bb79ddd48 89 }
leothedragon 0:8f0bb79ddd48 90 }
leothedragon 0:8f0bb79ddd48 91 return data;
leothedragon 0:8f0bb79ddd48 92 }
leothedragon 0:8f0bb79ddd48 93
leothedragon 0:8f0bb79ddd48 94 bool M2MTLVSerializer::serialize(uint16_t id, const M2MObjectInstance *object_instance, uint8_t *&data, uint32_t &size)
leothedragon 0:8f0bb79ddd48 95 {
leothedragon 0:8f0bb79ddd48 96 uint8_t *resource_data = NULL;
leothedragon 0:8f0bb79ddd48 97 uint32_t resource_size = 0;
leothedragon 0:8f0bb79ddd48 98 bool success;
leothedragon 0:8f0bb79ddd48 99
leothedragon 0:8f0bb79ddd48 100 bool valid = true;
leothedragon 0:8f0bb79ddd48 101 resource_data = serialize_resources(object_instance->resources(),resource_size,valid);
leothedragon 0:8f0bb79ddd48 102 if(valid) {
leothedragon 0:8f0bb79ddd48 103 if(serialize_TILV(TYPE_OBJECT_INSTANCE, id, resource_data, resource_size, data, size)) {
leothedragon 0:8f0bb79ddd48 104 success = true;
leothedragon 0:8f0bb79ddd48 105 } else {
leothedragon 0:8f0bb79ddd48 106 /* serializing object instance failed */
leothedragon 0:8f0bb79ddd48 107 success = false;
leothedragon 0:8f0bb79ddd48 108 }
leothedragon 0:8f0bb79ddd48 109 free(resource_data);
leothedragon 0:8f0bb79ddd48 110 } else {
leothedragon 0:8f0bb79ddd48 111 /* serializing resources failed */
leothedragon 0:8f0bb79ddd48 112 success = false;
leothedragon 0:8f0bb79ddd48 113 }
leothedragon 0:8f0bb79ddd48 114 return success;
leothedragon 0:8f0bb79ddd48 115 }
leothedragon 0:8f0bb79ddd48 116
leothedragon 0:8f0bb79ddd48 117 bool M2MTLVSerializer::serialize(const M2MResource *resource, uint8_t *&data, uint32_t &size)
leothedragon 0:8f0bb79ddd48 118 {
leothedragon 0:8f0bb79ddd48 119 bool success = false;
leothedragon 0:8f0bb79ddd48 120 if(resource->name_id() != -1) {
leothedragon 0:8f0bb79ddd48 121 success = resource->supports_multiple_instances() ?
leothedragon 0:8f0bb79ddd48 122 serialize_multiple_resource(resource, data, size) :
leothedragon 0:8f0bb79ddd48 123 serialize_resource(resource, data, size);
leothedragon 0:8f0bb79ddd48 124 }
leothedragon 0:8f0bb79ddd48 125 return success;
leothedragon 0:8f0bb79ddd48 126 }
leothedragon 0:8f0bb79ddd48 127
leothedragon 0:8f0bb79ddd48 128 bool M2MTLVSerializer::serialize_resource(const M2MResource *resource, uint8_t *&data, uint32_t &size)
leothedragon 0:8f0bb79ddd48 129 {
leothedragon 0:8f0bb79ddd48 130 bool success = false;
leothedragon 0:8f0bb79ddd48 131 if(resource->name_id() != -1) {
leothedragon 0:8f0bb79ddd48 132 if ( (resource->resource_instance_type() == M2MResourceBase::INTEGER) ||
leothedragon 0:8f0bb79ddd48 133 (resource->resource_instance_type() == M2MResourceBase::BOOLEAN) ||
leothedragon 0:8f0bb79ddd48 134 (resource->resource_instance_type() == M2MResourceBase::TIME) ) {
leothedragon 0:8f0bb79ddd48 135 success = serialize_TLV_binary_int(resource, TYPE_RESOURCE, resource->name_id(), data, size);
leothedragon 0:8f0bb79ddd48 136 }
leothedragon 0:8f0bb79ddd48 137 else if (resource->resource_instance_type() == M2MResourceBase::FLOAT) {
leothedragon 0:8f0bb79ddd48 138 success = serialize_TLV_binary_float(resource, TYPE_RESOURCE, resource->name_id(), data, size);
leothedragon 0:8f0bb79ddd48 139 }
leothedragon 0:8f0bb79ddd48 140 else {
leothedragon 0:8f0bb79ddd48 141 success = serialize_TILV(TYPE_RESOURCE, resource->name_id(),
leothedragon 0:8f0bb79ddd48 142 resource->value(), resource->value_length(), data, size);
leothedragon 0:8f0bb79ddd48 143 }
leothedragon 0:8f0bb79ddd48 144 }
leothedragon 0:8f0bb79ddd48 145 return success;
leothedragon 0:8f0bb79ddd48 146 }
leothedragon 0:8f0bb79ddd48 147
leothedragon 0:8f0bb79ddd48 148 bool M2MTLVSerializer::serialize_multiple_resource(const M2MResource *resource, uint8_t *&data, uint32_t &size)
leothedragon 0:8f0bb79ddd48 149 {
leothedragon 0:8f0bb79ddd48 150 bool success = false;
leothedragon 0:8f0bb79ddd48 151 uint8_t *nested_data = NULL;
leothedragon 0:8f0bb79ddd48 152 uint32_t nested_data_size = 0;
leothedragon 0:8f0bb79ddd48 153
leothedragon 0:8f0bb79ddd48 154 const M2MResourceInstanceList &instance_list = resource->resource_instances();
leothedragon 0:8f0bb79ddd48 155 if(!instance_list.empty()) {
leothedragon 0:8f0bb79ddd48 156 M2MResourceInstanceList::const_iterator it;
leothedragon 0:8f0bb79ddd48 157 it = instance_list.begin();
leothedragon 0:8f0bb79ddd48 158 for (; it!=instance_list.end(); it++) {
leothedragon 0:8f0bb79ddd48 159 uint16_t id = (*it)->instance_id();
leothedragon 0:8f0bb79ddd48 160 if (((*it)->operation() & M2MBase::GET_ALLOWED) == M2MBase::GET_ALLOWED) {
leothedragon 0:8f0bb79ddd48 161 if(!serialize_resource_instance(id, (*it), nested_data, nested_data_size)) {
leothedragon 0:8f0bb79ddd48 162 /* serializing instance has failed */
leothedragon 0:8f0bb79ddd48 163 /* free data so far allocated */
leothedragon 0:8f0bb79ddd48 164 free(nested_data);
leothedragon 0:8f0bb79ddd48 165 /* return fail immediately*/
leothedragon 0:8f0bb79ddd48 166 success = false;
leothedragon 0:8f0bb79ddd48 167 return success;
leothedragon 0:8f0bb79ddd48 168 }
leothedragon 0:8f0bb79ddd48 169 }
leothedragon 0:8f0bb79ddd48 170 }
leothedragon 0:8f0bb79ddd48 171 }
leothedragon 0:8f0bb79ddd48 172 if(resource->name_id() != -1 &&
leothedragon 0:8f0bb79ddd48 173 (resource->operation() & M2MBase::GET_ALLOWED) == M2MBase::GET_ALLOWED) {
leothedragon 0:8f0bb79ddd48 174 success = serialize_TILV(TYPE_MULTIPLE_RESOURCE, resource->name_id(),
leothedragon 0:8f0bb79ddd48 175 nested_data, nested_data_size, data, size);
leothedragon 0:8f0bb79ddd48 176 }
leothedragon 0:8f0bb79ddd48 177
leothedragon 0:8f0bb79ddd48 178 free(nested_data);
leothedragon 0:8f0bb79ddd48 179 return success;
leothedragon 0:8f0bb79ddd48 180 }
leothedragon 0:8f0bb79ddd48 181
leothedragon 0:8f0bb79ddd48 182 bool M2MTLVSerializer::serialize_resource_instance(uint16_t id, const M2MResourceInstance *resource, uint8_t *&data, uint32_t &size)
leothedragon 0:8f0bb79ddd48 183 {
leothedragon 0:8f0bb79ddd48 184 bool success;
leothedragon 0:8f0bb79ddd48 185
leothedragon 0:8f0bb79ddd48 186 if ( (resource->resource_instance_type() == M2MResourceBase::INTEGER) ||
leothedragon 0:8f0bb79ddd48 187 (resource->resource_instance_type() == M2MResourceBase::BOOLEAN) ||
leothedragon 0:8f0bb79ddd48 188 (resource->resource_instance_type() == M2MResourceBase::TIME) ) {
leothedragon 0:8f0bb79ddd48 189 success=serialize_TLV_binary_int(resource, TYPE_RESOURCE_INSTANCE, id, data, size);
leothedragon 0:8f0bb79ddd48 190 }
leothedragon 0:8f0bb79ddd48 191 else if (resource->resource_instance_type() == M2MResourceBase::FLOAT) {
leothedragon 0:8f0bb79ddd48 192 success=serialize_TLV_binary_float(resource, TYPE_RESOURCE_INSTANCE, id, data, size);
leothedragon 0:8f0bb79ddd48 193 }
leothedragon 0:8f0bb79ddd48 194 else {
leothedragon 0:8f0bb79ddd48 195 success=serialize_TILV(TYPE_RESOURCE_INSTANCE, id, resource->value(), resource->value_length(), data, size);
leothedragon 0:8f0bb79ddd48 196 }
leothedragon 0:8f0bb79ddd48 197
leothedragon 0:8f0bb79ddd48 198 return success;
leothedragon 0:8f0bb79ddd48 199 }
leothedragon 0:8f0bb79ddd48 200
leothedragon 0:8f0bb79ddd48 201 /* See, OMA-TS-LightweightM2M-V1_0-20170208-A, Appendix C,
leothedragon 0:8f0bb79ddd48 202 * Data Types, Integer, Boolean and Time TLV Format */
leothedragon 0:8f0bb79ddd48 203 bool M2MTLVSerializer::serialize_TLV_binary_int(const M2MResourceBase *resource, uint8_t type, uint16_t id, uint8_t *&data, uint32_t &size)
leothedragon 0:8f0bb79ddd48 204 {
leothedragon 0:8f0bb79ddd48 205 int64_t valueInt = resource->get_value_int();
leothedragon 0:8f0bb79ddd48 206 uint32_t buffer_size;
leothedragon 0:8f0bb79ddd48 207 /* max len 8 bytes */
leothedragon 0:8f0bb79ddd48 208 uint8_t buffer[8];
leothedragon 0:8f0bb79ddd48 209
leothedragon 0:8f0bb79ddd48 210 if (resource->resource_instance_type() == M2MResourceBase::BOOLEAN) {
leothedragon 0:8f0bb79ddd48 211 buffer_size = 1;
leothedragon 0:8f0bb79ddd48 212 buffer[0] = valueInt;
leothedragon 0:8f0bb79ddd48 213 } else {
leothedragon 0:8f0bb79ddd48 214 buffer_size = 8;
leothedragon 0:8f0bb79ddd48 215 common_write_64_bit(valueInt, buffer);
leothedragon 0:8f0bb79ddd48 216 }
leothedragon 0:8f0bb79ddd48 217
leothedragon 0:8f0bb79ddd48 218 return serialize_TILV(type, id, buffer, buffer_size, data, size);
leothedragon 0:8f0bb79ddd48 219 }
leothedragon 0:8f0bb79ddd48 220
leothedragon 0:8f0bb79ddd48 221 /* See, OMA-TS-LightweightM2M-V1_0-20170208-A, Appendix C,
leothedragon 0:8f0bb79ddd48 222 * Data Type Float (32 bit only) TLV Format */
leothedragon 0:8f0bb79ddd48 223 bool M2MTLVSerializer::serialize_TLV_binary_float(const M2MResourceBase *resource, uint8_t type, uint16_t id, uint8_t *&data, uint32_t &size)
leothedragon 0:8f0bb79ddd48 224 {
leothedragon 0:8f0bb79ddd48 225 float valueFloat = resource->get_value_float();
leothedragon 0:8f0bb79ddd48 226 /* max len 8 bytes */
leothedragon 0:8f0bb79ddd48 227 uint8_t buffer[4];
leothedragon 0:8f0bb79ddd48 228
leothedragon 0:8f0bb79ddd48 229 common_write_32_bit(*(uint32_t*)&valueFloat, buffer);
leothedragon 0:8f0bb79ddd48 230
leothedragon 0:8f0bb79ddd48 231 return serialize_TILV(type, id, buffer, 4, data, size);
leothedragon 0:8f0bb79ddd48 232 }
leothedragon 0:8f0bb79ddd48 233
leothedragon 0:8f0bb79ddd48 234
leothedragon 0:8f0bb79ddd48 235 bool M2MTLVSerializer::serialize_TILV(uint8_t type, uint16_t id, uint8_t *value, uint32_t value_length, uint8_t *&data, uint32_t &size)
leothedragon 0:8f0bb79ddd48 236 {
leothedragon 0:8f0bb79ddd48 237 uint8_t *tlv = 0;
leothedragon 0:8f0bb79ddd48 238 const uint32_t type_length = TLV_TYPE_SIZE;
leothedragon 0:8f0bb79ddd48 239 type += id < 256 ? 0 : ID16;
leothedragon 0:8f0bb79ddd48 240 type += value_length < 8 ? value_length :
leothedragon 0:8f0bb79ddd48 241 value_length < 256 ? LENGTH8 :
leothedragon 0:8f0bb79ddd48 242 value_length < 65536 ? LENGTH16 : LENGTH24;
leothedragon 0:8f0bb79ddd48 243 uint8_t tlv_type;
leothedragon 0:8f0bb79ddd48 244 tlv_type = type & 0xFF;
leothedragon 0:8f0bb79ddd48 245
leothedragon 0:8f0bb79ddd48 246 uint32_t id_size;
leothedragon 0:8f0bb79ddd48 247 uint8_t id_array[MAX_TLV_ID_SIZE];
leothedragon 0:8f0bb79ddd48 248 serialize_id(id, id_size, id_array);
leothedragon 0:8f0bb79ddd48 249
leothedragon 0:8f0bb79ddd48 250 uint32_t length_size;
leothedragon 0:8f0bb79ddd48 251 uint8_t length_array[MAX_TLV_LENGTH_SIZE];
leothedragon 0:8f0bb79ddd48 252 serialize_length(value_length, length_size, length_array);
leothedragon 0:8f0bb79ddd48 253
leothedragon 0:8f0bb79ddd48 254 tlv = (uint8_t*)malloc(size + type_length + id_size + length_size + value_length);
leothedragon 0:8f0bb79ddd48 255 if (!tlv) {
leothedragon 0:8f0bb79ddd48 256 /* memory allocation has failed */
leothedragon 0:8f0bb79ddd48 257 /* return failure immediately */
leothedragon 0:8f0bb79ddd48 258 return false;
leothedragon 0:8f0bb79ddd48 259 /* eventually NULL will be returned to serializer public method caller */
leothedragon 0:8f0bb79ddd48 260 }
leothedragon 0:8f0bb79ddd48 261 if(data) {
leothedragon 0:8f0bb79ddd48 262 memcpy(tlv, data, size);
leothedragon 0:8f0bb79ddd48 263 free(data);
leothedragon 0:8f0bb79ddd48 264 }
leothedragon 0:8f0bb79ddd48 265 memcpy(tlv+size, &tlv_type, type_length);
leothedragon 0:8f0bb79ddd48 266 memcpy(tlv+size+type_length, id_array, id_size);
leothedragon 0:8f0bb79ddd48 267 memcpy(tlv+size+type_length+id_size, length_array, length_size);
leothedragon 0:8f0bb79ddd48 268 memcpy(tlv+size+type_length+id_size+length_size, value, value_length);
leothedragon 0:8f0bb79ddd48 269
leothedragon 0:8f0bb79ddd48 270 data = tlv;
leothedragon 0:8f0bb79ddd48 271 size += type_length + id_size + length_size + value_length;
leothedragon 0:8f0bb79ddd48 272 return true;
leothedragon 0:8f0bb79ddd48 273 }
leothedragon 0:8f0bb79ddd48 274
leothedragon 0:8f0bb79ddd48 275 void M2MTLVSerializer::serialize_id(uint16_t id, uint32_t &size, uint8_t *id_ptr)
leothedragon 0:8f0bb79ddd48 276 {
leothedragon 0:8f0bb79ddd48 277 if(id > 255) {
leothedragon 0:8f0bb79ddd48 278 size=2;
leothedragon 0:8f0bb79ddd48 279 id_ptr[0] = (id & 0xFF00) >> 8;
leothedragon 0:8f0bb79ddd48 280 id_ptr[1] = id & 0xFF;
leothedragon 0:8f0bb79ddd48 281 } else {
leothedragon 0:8f0bb79ddd48 282 size=1;
leothedragon 0:8f0bb79ddd48 283 id_ptr[0] = id & 0xFF;
leothedragon 0:8f0bb79ddd48 284 }
leothedragon 0:8f0bb79ddd48 285 }
leothedragon 0:8f0bb79ddd48 286
leothedragon 0:8f0bb79ddd48 287 void M2MTLVSerializer::serialize_length(uint32_t length, uint32_t &size, uint8_t *length_ptr)
leothedragon 0:8f0bb79ddd48 288 {
leothedragon 0:8f0bb79ddd48 289 if (length > 65535) {
leothedragon 0:8f0bb79ddd48 290 size = 3;
leothedragon 0:8f0bb79ddd48 291 length_ptr[0] = (length & 0xFF0000) >> 16;
leothedragon 0:8f0bb79ddd48 292 length_ptr[1] = (length & 0xFF00) >> 8;
leothedragon 0:8f0bb79ddd48 293 length_ptr[2] = length & 0xFF;
leothedragon 0:8f0bb79ddd48 294 } else if (length > 255) {
leothedragon 0:8f0bb79ddd48 295 size = 2;
leothedragon 0:8f0bb79ddd48 296 length_ptr[0] = (length & 0xFF00) >> 8;
leothedragon 0:8f0bb79ddd48 297 length_ptr[1] = length & 0xFF;
leothedragon 0:8f0bb79ddd48 298 } else if (length > 7) {
leothedragon 0:8f0bb79ddd48 299 size = 1;
leothedragon 0:8f0bb79ddd48 300 length_ptr[0] = length & 0xFF;
leothedragon 0:8f0bb79ddd48 301 } else {
leothedragon 0:8f0bb79ddd48 302 size=0;
leothedragon 0:8f0bb79ddd48 303 }
leothedragon 0:8f0bb79ddd48 304 }
leothedragon 0:8f0bb79ddd48 305