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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 <stdlib.h>
#include <LongBow/runtime.h>
#include <parc/algol/parc_Memory.h>
#include <parc/algol/parc_Buffer.h>
#include <ccnx/common/codec/schema_v1/ccnxCodecSchemaV1_FixedHeader.h>
#include <ccnx/common/codec/schema_v1/ccnxCodecSchemaV1_Types.h>
#include <ccnx/common/codec/ccnxCodec_TlvUtilities.h>
static const size_t _fixedHeaderBytes = 8;
static const int _fixedHeader_VersionOffset = 0;
static const int _fixedHeader_PacketTypeOffset = 1;
static const int _fixedHeader_PacketLengthOffset = 2;
static const int _fixedHeader_HopLimitOffset = 4;
static const int _fixedHeader_ReturnCodeOffset = 5;
static const int _fixedHeader_FlagsOffset = 6;
static const int _fixedHeader_HeaderLengthOffset = 7;
bool
ccnxCodecSchemaV1FixedHeaderDecoder_Decode(CCNxCodecTlvDecoder *decoder, CCNxTlvDictionary *packetDictionary)
{
if (ccnxCodecTlvDecoder_EnsureRemaining(decoder, _fixedHeaderBytes)) {
PARCBuffer *buffer = ccnxCodecTlvDecoder_GetValue(decoder, _fixedHeaderBytes);
bool success = ccnxTlvDictionary_PutBuffer(packetDictionary, CCNxCodecSchemaV1TlvDictionary_HeadersFastArray_FixedHeader, buffer);
// validation
parcBuffer_SetPosition(buffer, _fixedHeader_VersionOffset);
uint8_t version = parcBuffer_GetUint8(buffer);
parcBuffer_SetPosition(buffer, _fixedHeader_PacketLengthOffset);
uint16_t packetLength = parcBuffer_GetUint16(buffer);
parcBuffer_SetPosition(buffer, _fixedHeader_ReturnCodeOffset);
uint8_t interestReturnCode = parcBuffer_GetUint8(buffer);
parcBuffer_SetPosition(buffer, _fixedHeader_HopLimitOffset);
uint8_t hopLimit = parcBuffer_GetUint8(buffer);
parcBuffer_SetPosition(buffer, _fixedHeader_HeaderLengthOffset);
uint8_t headerLength = parcBuffer_GetUint8(buffer);
if (version != 1) {
CCNxCodecError *error = ccnxCodecError_Create(TLV_ERR_VERSION, __func__, __LINE__, _fixedHeader_VersionOffset);
ccnxCodecTlvDecoder_SetError(decoder, error);
ccnxCodecError_Release(&error);
success = false;
} else if (packetLength < _fixedHeaderBytes) {
CCNxCodecError *error = ccnxCodecError_Create(TLV_ERR_PACKETLENGTH_TOO_SHORT, __func__, __LINE__, _fixedHeader_PacketTypeOffset);
ccnxCodecTlvDecoder_SetError(decoder, error);
ccnxCodecError_Release(&error);
success = false;
} else if (headerLength < _fixedHeaderBytes) {
CCNxCodecError *error = ccnxCodecError_Create(TLV_ERR_HEADERLENGTH_TOO_SHORT, __func__, __LINE__, _fixedHeader_HeaderLengthOffset);
ccnxCodecTlvDecoder_SetError(decoder, error);
ccnxCodecError_Release(&error);
success = false;
} else if (packetLength < headerLength) {
CCNxCodecError *error = ccnxCodecError_Create(TLV_ERR_PACKETLENGTHSHORTER, __func__, __LINE__, _fixedHeader_PacketTypeOffset);
ccnxCodecTlvDecoder_SetError(decoder, error);
ccnxCodecError_Release(&error);
success = false;
}
// decoder now points to just past the fixed header
parcBuffer_Release(&buffer);
// Set the hoplimit in the dictionary.
ccnxTlvDictionary_PutInteger(packetDictionary,
CCNxCodecSchemaV1TlvDictionary_MessageFastArray_HOPLIMIT, hopLimit);
// Set the InterestReturn code in the dictionary.
ccnxTlvDictionary_PutInteger(packetDictionary,
CCNxCodecSchemaV1TlvDictionary_HeadersFastArray_InterestReturnCode,
interestReturnCode);
return success;
} else {
CCNxCodecError *error = ccnxCodecError_Create(TLV_ERR_DECODE, __func__, __LINE__, ccnxCodecTlvDecoder_Position(decoder));
ccnxCodecTlvDecoder_SetError(decoder, error);
ccnxCodecError_Release(&error);
return false;
}
}
int
ccnxCodecSchemaV1FixedHeaderDecoder_GetVersion(CCNxTlvDictionary *packetDictionary)
{
PARCBuffer *fixedHeader = ccnxTlvDictionary_GetBuffer(packetDictionary, CCNxCodecSchemaV1TlvDictionary_HeadersFastArray_FixedHeader);
if (fixedHeader != NULL) {
parcBuffer_SetPosition(fixedHeader, _fixedHeader_VersionOffset);
uint8_t version = parcBuffer_GetUint8(fixedHeader);
return version;
}
return -1;
}
int
ccnxCodecSchemaV1FixedHeaderDecoder_GetPacketType(CCNxTlvDictionary *packetDictionary)
{
PARCBuffer *fixedHeader = ccnxTlvDictionary_GetBuffer(packetDictionary, CCNxCodecSchemaV1TlvDictionary_HeadersFastArray_FixedHeader);
if (fixedHeader != NULL) {
parcBuffer_SetPosition(fixedHeader, _fixedHeader_PacketTypeOffset);
uint8_t packetType = parcBuffer_GetUint8(fixedHeader);
return packetType;
}
return -1;
}
int
ccnxCodecSchemaV1FixedHeaderDecoder_GetPacketLength(CCNxTlvDictionary *packetDictionary)
{
PARCBuffer *fixedHeader = ccnxTlvDictionary_GetBuffer(packetDictionary, CCNxCodecSchemaV1TlvDictionary_HeadersFastArray_FixedHeader);
if (fixedHeader != NULL) {
parcBuffer_SetPosition(fixedHeader, _fixedHeader_PacketLengthOffset);
uint16_t payloadLength = parcBuffer_GetUint16(fixedHeader);
return payloadLength;
}
return -1;
}
int
ccnxCodecSchemaV1FixedHeaderDecoder_GetHeaderLength(CCNxTlvDictionary *packetDictionary)
{
int length = -1;
PARCBuffer *fixedHeader = ccnxTlvDictionary_GetBuffer(packetDictionary, CCNxCodecSchemaV1TlvDictionary_HeadersFastArray_FixedHeader);
if (fixedHeader != NULL) {
parcBuffer_SetPosition(fixedHeader, _fixedHeader_HeaderLengthOffset);
uint8_t headerLength = parcBuffer_GetUint8(fixedHeader);
// 8 is the minimum size of headerLength
if (headerLength >= _fixedHeaderBytes) {
length = headerLength;
}
}
return length;
}
int
ccnxCodecSchemaV1FixedHeaderDecoder_GetOptionalHeaderLength(CCNxTlvDictionary *packetDictionary)
{
int headerLength = ccnxCodecSchemaV1FixedHeaderDecoder_GetHeaderLength(packetDictionary);
return headerLength - _fixedHeaderBytes;
}
int
ccnxCodecSchemaV1FixedHeaderDecoder_GetHopLimit(CCNxTlvDictionary *packetDictionary)
{
PARCBuffer *fixedHeader = ccnxTlvDictionary_GetBuffer(packetDictionary, CCNxCodecSchemaV1TlvDictionary_HeadersFastArray_FixedHeader);
if (fixedHeader != NULL) {
parcBuffer_SetPosition(fixedHeader, _fixedHeader_HopLimitOffset);
uint8_t hopLimit = parcBuffer_GetUint8(fixedHeader);
return hopLimit;
}
return -1;
}
int
ccnxCodecSchemaV1FixedHeaderDecoder_GetReturnCode(CCNxTlvDictionary *packetDictionary)
{
PARCBuffer *fixedHeader = ccnxTlvDictionary_GetBuffer(packetDictionary, CCNxCodecSchemaV1TlvDictionary_HeadersFastArray_FixedHeader);
if (fixedHeader != NULL) {
parcBuffer_SetPosition(fixedHeader, _fixedHeader_ReturnCodeOffset);
uint8_t returnCode = parcBuffer_GetUint8(fixedHeader);
return returnCode;
}
return -1;
}
int
ccnxCodecSchemaV1FixedHeaderDecoder_GetFlags(CCNxTlvDictionary *packetDictionary)
{
PARCBuffer *fixedHeader = ccnxTlvDictionary_GetBuffer(packetDictionary, CCNxCodecSchemaV1TlvDictionary_HeadersFastArray_FixedHeader);
if (fixedHeader != NULL) {
parcBuffer_SetPosition(fixedHeader, _fixedHeader_FlagsOffset);
uint8_t flags = parcBuffer_GetUint8(fixedHeader);
return flags;
}
return -1;
}
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