void * CBBlockChainStorageLoadUnspentOutput(void * validator, uint8_t * txHash, uint32_t outputIndex, bool * coinbase, uint32_t * outputHeight){
CBFullValidator * validatorObj = validator;
CBDatabase * database = (CBDatabase *)validatorObj->storage;
// First read data for the unspent output key.
memcpy(CB_UNSPENT_OUTPUT_KEY + 2, txHash, 32);
CBInt32ToArray(CB_UNSPENT_OUTPUT_KEY, 34, outputIndex);
if (NOT CBDatabaseReadValue(database, CB_UNSPENT_OUTPUT_KEY, CB_DATA_ARRAY, 8, 0)) {
CBLogError("Cannot read unspent output information from the block chain database");
return NULL;
}
uint32_t outputPosition = CBArrayToInt32(CB_DATA_ARRAY, CB_UNSPENT_OUTPUT_REF_POSITION);
uint32_t outputLength = CBArrayToInt32(CB_DATA_ARRAY, CB_UNSPENT_OUTPUT_REF_LENGTH);
// Now read data for the transaction
memcpy(CB_TRANSACTION_INDEX_KEY + 2, txHash, 32);
if (NOT CBDatabaseReadValue(database, CB_TRANSACTION_INDEX_KEY, CB_DATA_ARRAY, 14, 0)) {
CBLogError("Cannot read a transaction reference from the transaction index.");
return NULL;
}
uint8_t outputBranch = CB_DATA_ARRAY[CB_TRANSACTION_REF_BRANCH];
uint32_t outputBlockIndex = CBArrayToInt32(CB_DATA_ARRAY, CB_TRANSACTION_REF_BLOCK_INDEX);
// Set coinbase
*coinbase = CB_DATA_ARRAY[CB_TRANSACTION_REF_IS_COINBASE];
// Set output height
*outputHeight = validatorObj->branches[outputBranch].startHeight + outputBlockIndex;
// Get the output from storage
CB_BLOCK_KEY[2] = outputBranch;
CBInt32ToArray(CB_BLOCK_KEY, 3, outputBlockIndex);
// Get output data
CBByteArray * outputBytes = CBNewByteArrayOfSize(outputLength);
if (NOT outputBytes) {
CBLogError("Could not create CBByteArray for an unspent output.");
return NULL;
}
if (NOT CBDatabaseReadValue(database, CB_BLOCK_KEY, CBByteArrayGetData(outputBytes), outputLength, CB_BLOCK_START + outputPosition)) {
CBLogError("Could not read an unspent output");
CBReleaseObject(outputBytes);
return NULL;
}
// Create output object
CBTransactionOutput * output = CBNewTransactionOutputFromData(outputBytes);
CBReleaseObject(outputBytes);
if (NOT output) {
CBLogError("Could not create an object for an unspent output");
return NULL;
}
if (NOT CBTransactionOutputDeserialise(output)) {
CBLogError("Could not deserialise an unspent output");
return NULL;
}
return output;
}
uint32_t CBTransactionDeserialise(CBTransaction * self){
CBByteArray * bytes = CBGetMessage(self)->bytes;
if (NOT bytes) {
CBLogError("Attempting to deserialise a CBTransaction with no bytes.");
return 0;
}
if (bytes->length < 10) {
CBLogError("Attempting to deserialise a CBTransaction with less than 10 bytes.");
return 0;
}
self->version = CBByteArrayReadInt32(bytes, 0);
CBVarInt inputOutputLen = CBVarIntDecode(bytes, 4);
if (NOT inputOutputLen.val
|| inputOutputLen.val * 41 > bytes->length - 10) {
CBLogError("Attempting to deserialise a CBTransaction with a bad var int for the number of inputs.");
return 0;
}
uint32_t cursor = 4 + inputOutputLen.size;
self->inputNum = (uint32_t)inputOutputLen.val;
self->inputs = malloc(sizeof(*self->inputs) * self->inputNum);
if (NOT self->inputs) {
CBLogError("Cannot allocate %i bytes of memory in CBTransactionDeserialise for inputs.\n", sizeof(*self->inputs) * self->inputNum);
return 0;
}
for (uint32_t x = 0; x < self->inputNum; x++) {
CBByteArray * data = CBByteArraySubReference(bytes, cursor, bytes->length-cursor);
if (NOT data) {
CBLogError("Cannot create a new CBByteArray in CBTransactionDeserialise for the input number %u.", x);
return 0;
}
CBTransactionInput * input = CBNewTransactionInputFromData(data);
if (NOT input) {
CBLogError("Cannot create a new CBTransactionInput in CBTransactionDeserialise for the input number %u.", x);
CBReleaseObject(data);
return 0;
}
uint32_t len = CBTransactionInputDeserialise(input);
if (NOT len){
CBLogError("CBTransaction cannot be deserialised because of an error with the input number %u.", x);
CBReleaseObject(data);
return 0;
}
// The input was deserialised correctly. Now adjust the length and add it to the transaction.
data->length = len;
CBReleaseObject(data);
self->inputs[x] = input;
cursor += len; // Move along to next input
}
if (bytes->length < cursor + 5) { // Needs at least 5 more for the output CBVarInt and the lockTime
CBLogError("Attempting to deserialise a CBTransaction with not enough bytes for the outputs and lockTime.");
return 0;
}
inputOutputLen = CBVarIntDecode(bytes, cursor);
if (NOT inputOutputLen.val
|| inputOutputLen.val * 9 > bytes->length - 10) {
CBLogError("Attempting to deserialise a CBTransaction with a bad var int for the number of outputs.");
return 0;
}
cursor += inputOutputLen.size; // Move past output CBVarInt
self->outputNum = (uint32_t)inputOutputLen.val;
self->outputs = malloc(sizeof(*self->outputs) * self->outputNum);
if (NOT self->outputs) {
CBLogError("Cannot allocate %i bytes of memory in CBTransactionDeserialise for outputs.\n", sizeof(sizeof(*self->outputs) * self->outputNum));
return 0;
}
for (uint32_t x = 0; x < self->outputNum; x++) {
CBByteArray * data = CBByteArraySubReference(bytes, cursor, bytes->length-cursor);
if (NOT data) {
CBLogError("Cannot create a new CBByteArray in CBTransactionDeserialise for the output number %u.", x);
return 0;
}
CBTransactionOutput * output = CBNewTransactionOutputFromData(data);
if (NOT output) {
CBLogError("Cannot create a new CBTransactionOutput in CBTransactionDeserialise for the output number %u.", x);
CBReleaseObject(data);
return 0;
}
uint32_t len = CBTransactionOutputDeserialise(output);
if (NOT len){
CBLogError("CBTransaction cannot be deserialised because of an error with the output number %u.", x);
CBReleaseObject(data);
return 0;
}
// The output was deserialised correctly. Now adjust the length and add it to the transaction.
data->length = len;
CBReleaseObject(data);
self->outputs[x] = output;
cursor += len; // Move along to next output
}
if (bytes->length < cursor + 4) { // Ensure 4 bytes are available for lockTime
CBLogError("Attempting to deserialise a CBTransaction with not enough bytes for the lockTime.");
return 0;
}
self->lockTime = CBByteArrayReadInt32(bytes, cursor);
return cursor + 4;
}