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/*
* Copyright (c) 2017 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
*/
#include <config.h>
#include <stdio.h>
#include <ccnx/common/codec/schema_v1/ccnxCodecSchemaV1_NameCodec.h>
#include <ccnx/common/codec/schema_v1/ccnxCodecSchemaV1_HashCodec.h>
#include <ccnx/common/codec/ccnxCodec_TlvUtilities.h>
#include <LongBow/runtime.h>
bool
ccnxCodecTlvUtilities_DecodeContainer(CCNxCodecTlvDecoder *decoder, CCNxTlvDictionary *packetDictionary, bool (*typeDecoder)(CCNxCodecTlvDecoder *decoder, CCNxTlvDictionary *packetDictionary, uint16_t type, uint16_t length))
{
while (ccnxCodecTlvDecoder_EnsureRemaining(decoder, 4)) {
uint16_t type = ccnxCodecTlvDecoder_GetType(decoder);
uint16_t length = ccnxCodecTlvDecoder_GetLength(decoder);
if (ccnxCodecTlvDecoder_EnsureRemaining(decoder, length)) {
bool success = typeDecoder(decoder, packetDictionary, type, length);
if (!success) {
return false;
}
} else {
// overflow! The TLV length goes beyond the end of the container
return false;
}
}
// Make sure we used up the whole buffer. If we're at the end,
// then it was a successful decode, otherwise something is wrong.
return ccnxCodecTlvDecoder_IsEmpty(decoder);
}
bool
ccnxCodecTlvUtilities_DecodeSubcontainer(CCNxCodecTlvDecoder *decoder, CCNxTlvDictionary *packetDictionary, uint16_t key, uint16_t length,
bool (*subcontainerDecoder)(CCNxCodecTlvDecoder *, CCNxTlvDictionary *))
{
bool success = false;
CCNxCodecTlvDecoder *innerDecoder = ccnxCodecTlvDecoder_GetContainer(decoder, length);
if (innerDecoder) {
success = subcontainerDecoder(innerDecoder, packetDictionary);
ccnxCodecTlvDecoder_Destroy(&innerDecoder);
}
return success;
}
bool
ccnxCodecTlvUtilities_PutAsInteger(CCNxCodecTlvDecoder *decoder, CCNxTlvDictionary *packetDictionary, uint16_t type, uint16_t length, int dictionaryKey)
{
uint64_t value;
if (ccnxCodecTlvDecoder_GetVarInt(decoder, length, &value)) {
return ccnxTlvDictionary_PutInteger(packetDictionary, dictionaryKey, value);
}
return false;
}
bool
ccnxCodecTlvUtilities_PutAsName(CCNxCodecTlvDecoder *decoder, CCNxTlvDictionary *packetDictionary, uint16_t type, uint16_t length, int arrayKey)
{
bool success = false;
CCNxName *name = ccnxCodecSchemaV1NameCodec_DecodeValue(decoder, length);
success = ccnxTlvDictionary_PutName(packetDictionary, arrayKey, name);
ccnxName_Release(&name);
return success;
}
bool
ccnxCodecTlvUtilities_PutAsBuffer(CCNxCodecTlvDecoder *decoder, CCNxTlvDictionary *packetDictionary, uint16_t type, uint16_t length, int arrayKey)
{
PARCBuffer *buffer = ccnxCodecTlvDecoder_GetValue(decoder, length);
bool success = ccnxTlvDictionary_PutBuffer(packetDictionary, arrayKey, buffer);
parcBuffer_Release(&buffer);
return success;
}
bool
ccnxCodecTlvUtilities_PutAsHash(CCNxCodecTlvDecoder *decoder, CCNxTlvDictionary *packetDictionary, uint16_t type, uint16_t length, int arrayKey)
{
PARCCryptoHash *hash = ccnxCodecSchemaV1HashCodec_DecodeValue(decoder, length);
bool success = false;
if (hash != NULL) {
success = ccnxTlvDictionary_PutObject(packetDictionary, arrayKey, (const PARCObject *) hash);
parcCryptoHash_Release(&hash);
}
return success;
}
bool
ccnxCodecTlvUtilities_PutAsListBuffer(CCNxCodecTlvDecoder *decoder, CCNxTlvDictionary *packetDictionary, uint16_t type, uint16_t length, int listKey)
{
PARCBuffer *buffer = ccnxCodecTlvDecoder_GetValue(decoder, length);
bool success = ccnxTlvDictionary_PutListBuffer(packetDictionary, listKey, type, buffer);
parcBuffer_Release(&buffer);
return success;
}
ssize_t
ccnxCodecTlvUtilities_NestedEncode(CCNxCodecTlvEncoder *outerEncoder, CCNxTlvDictionary *packetDictionary, uint32_t nestedType,
ssize_t (*nestedEncoderFunction)(CCNxCodecTlvEncoder *protoInfoEncoder, CCNxTlvDictionary *packetDictionary))
{
size_t startPosition = ccnxCodecTlvEncoder_Position(outerEncoder);
ccnxCodecTlvEncoder_AppendContainer(outerEncoder, nestedType, 0);
ssize_t nestedLength = nestedEncoderFunction(outerEncoder, packetDictionary);
if (nestedLength > 0) {
ccnxCodecTlvEncoder_SetContainerLength(outerEncoder, startPosition, nestedLength);
} else {
// rewind the container
ccnxCodecTlvEncoder_SetPosition(outerEncoder, startPosition);
return nestedLength;
}
size_t endPosition = ccnxCodecTlvEncoder_Position(outerEncoder);
return endPosition - startPosition;
}
ssize_t
ccnxCodecTlvUtilities_EncodeCustomList(CCNxCodecTlvEncoder *encoder, CCNxTlvDictionary *packetDictionary, int listKey)
{
ssize_t length = 0;
size_t size = ccnxTlvDictionary_ListSize(packetDictionary, listKey);
for (int i = 0; i < size; i++) {
PARCBuffer *buffer;
uint32_t key;
ssize_t innerLength = -1;
bool success = ccnxTlvDictionary_ListGetByPosition(packetDictionary, listKey, i, &buffer, &key);
if (success) {
innerLength = ccnxCodecTlvEncoder_AppendBuffer(encoder, key, buffer);
}
if (innerLength < 0) {
return -1;
}
length += innerLength;
}
return length;
}
bool
ccnxCodecTlvUtilities_GetVarInt(PARCBuffer *input, size_t length, uint64_t *output)
{
assertNotNull(input, "Parameter input must be non-null");
assertNotNull(output, "Parameter output must be non-null");
bool success = false;
if (length >= 1 && length <= 8 && parcBuffer_Remaining(input) >= length) {
uint64_t value = 0;
for (int i = 0; i < length; i++) {
value = value << 8 | parcBuffer_GetUint8(input);
}
*output = value;
success = true;
}
return success;
}
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