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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_Types.h>
#include <ccnx/common/codec/ccnxCodec_TlvUtilities.h>
#include <ccnx/common/codec/schema_v1/ccnxCodecSchemaV1_NameCodec.h>
#include <ccnx/common/codec/schema_v1/ccnxCodecSchemaV1_LinkCodec.h>
ssize_t
ccnxCodecSchemaV1LinkCodec_Encode(CCNxCodecTlvEncoder *encoder, const CCNxLink *link)
{
ssize_t length = 0;
const CCNxName *name = ccnxLink_GetName(link);
if (name) {
length += ccnxCodecSchemaV1NameCodec_Encode(encoder, CCNxCodecSchemaV1Types_Link_Name, name);
PARCBuffer *keyid = ccnxLink_GetKeyID(link);
if (keyid) {
length += ccnxCodecTlvEncoder_AppendBuffer(encoder, CCNxCodecSchemaV1Types_Link_KeyIdRestriction, keyid);
}
PARCBuffer *hash = ccnxLink_GetContentObjectHash(link);
if (hash) {
length += ccnxCodecTlvEncoder_AppendBuffer(encoder, CCNxCodecSchemaV1Types_Link_ContentObjectHashRestriction, hash);
}
} else {
length = -1;
CCNxCodecError *error = ccnxCodecError_Create(TLV_MISSING_MANDATORY, __func__, __LINE__, ccnxCodecTlvEncoder_Position(encoder));
ccnxCodecTlvEncoder_SetError(encoder, error);
ccnxCodecError_Release(&error);
}
return length;
}
typedef struct decoded_link {
CCNxName *linkName;
PARCBuffer *linkKeyId;
PARCBuffer *linkHash;
} _DecodedLink;
static int
_decodeField(CCNxCodecTlvDecoder *decoder, _DecodedLink *decodedLink)
{
int errorCode = TLV_ERR_NO_ERROR;
uint16_t type = ccnxCodecTlvDecoder_GetType(decoder);
uint16_t length = ccnxCodecTlvDecoder_GetLength(decoder);
if (ccnxCodecTlvDecoder_EnsureRemaining(decoder, length)) {
switch (type) {
case CCNxCodecSchemaV1Types_Link_Name:
if (decodedLink->linkName == NULL) {
decodedLink->linkName = ccnxCodecSchemaV1NameCodec_DecodeValue(decoder, length);
} else {
errorCode = TLV_ERR_DUPLICATE_FIELD;
}
break;
case CCNxCodecSchemaV1Types_Link_KeyIdRestriction:
if (decodedLink->linkKeyId == NULL) {
decodedLink->linkKeyId = ccnxCodecTlvDecoder_GetValue(decoder, length);
} else {
errorCode = TLV_ERR_DUPLICATE_FIELD;
}
break;
case CCNxCodecSchemaV1Types_Link_ContentObjectHashRestriction:
if (decodedLink->linkHash == NULL) {
decodedLink->linkHash = ccnxCodecTlvDecoder_GetValue(decoder, length);
} else {
errorCode = TLV_ERR_DUPLICATE_FIELD;
}
break;
default:
// we do not support unknown TLVs
errorCode = TLV_ERR_DECODE;
break;
}
} else {
errorCode = TLV_ERR_TOO_LONG;
}
return errorCode;
}
static void
_decodecLinkCleanup(_DecodedLink *decodedLink)
{
if (decodedLink->linkName) {
ccnxName_Release(&decodedLink->linkName);
}
if (decodedLink->linkKeyId) {
parcBuffer_Release(&decodedLink->linkKeyId);
}
if (decodedLink->linkHash) {
parcBuffer_Release(&decodedLink->linkHash);
}
}
CCNxLink *
ccnxCodecSchemaV1LinkCodec_DecodeValue(CCNxCodecTlvDecoder *decoder, uint16_t linkLength)
{
int errorCode = TLV_ERR_NO_ERROR;
CCNxLink *link = NULL;
_DecodedLink decodedLink;
memset(&decodedLink, 0, sizeof(_DecodedLink));
if (ccnxCodecTlvDecoder_EnsureRemaining(decoder, linkLength)) {
while (errorCode == TLV_ERR_NO_ERROR && ccnxCodecTlvDecoder_EnsureRemaining(decoder, 4)) {
errorCode = _decodeField(decoder, &decodedLink);
}
} else {
errorCode = TLV_ERR_TOO_LONG;
}
if (errorCode == TLV_ERR_NO_ERROR && decodedLink.linkName == NULL) {
errorCode = TLV_ERR_DECODE;
}
if (errorCode != TLV_ERR_NO_ERROR) {
CCNxCodecError *error = ccnxCodecError_Create(errorCode, __func__, __LINE__, ccnxCodecTlvDecoder_Position(decoder));
ccnxCodecTlvDecoder_SetError(decoder, error);
ccnxCodecError_Release(&error);
} else {
link = ccnxLink_Create(decodedLink.linkName, decodedLink.linkKeyId, decodedLink.linkHash);
}
// cleanup any partial memory allocations
_decodecLinkCleanup(&decodedLink);
return link;
}
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