private static JoinSplit ParseJoinSplit(BlockMemoryStreamReader blockMemoryStreamReader)
{
JoinSplit joinSplit = new JoinSplit();
joinSplit.AmountIn = blockMemoryStreamReader.ReadUInt64();
joinSplit.AmountOut = blockMemoryStreamReader.ReadUInt64();
joinSplit.Anchor = new ByteArray(blockMemoryStreamReader.ReadBytes(32));
for (int i = 0; i < joinSplit.Nullifiers.Length; ++i)
{
joinSplit.Nullifiers[i] = new ByteArray(blockMemoryStreamReader.ReadBytes(32));
}
for (int i = 0; i < joinSplit.Commitments.Length; ++i)
{
joinSplit.Commitments[i] = new ByteArray(blockMemoryStreamReader.ReadBytes(32));
}
joinSplit.EphemeralKey = new ByteArray(blockMemoryStreamReader.ReadBytes(32));
joinSplit.RandomSeed = new ByteArray(blockMemoryStreamReader.ReadBytes(32));
for (int i = 0; i < joinSplit.MACs.Length; ++i)
{
joinSplit.MACs[i] = new ByteArray(blockMemoryStreamReader.ReadBytes(32));
}
joinSplit.Proof = BlockchainParser.ParseZCProof(blockMemoryStreamReader);
for (int i = 0; i < joinSplit.Ciphertexts.Length; ++i)
{
joinSplit.Ciphertexts[i] = new ByteArray(blockMemoryStreamReader.ReadBytes(ZcashConstants.ZC_NOTECIPHERTEXT_SIZE));
}
return(joinSplit);
}
/// <summary>
/// Parses a Bitcoin transaction.
/// </summary>
/// <param name="blockMemoryStreamReader">
/// Provides access to a section of the Bitcoin blockchain file.
/// </param>
/// <returns>
/// The Bitcoin transaction that was parsed.
/// </returns>
private static Transaction ParseTransaction(BlockMemoryStreamReader blockMemoryStreamReader)
{
Transaction transaction = new Transaction();
int positionInBaseStreamAtTransactionStart = (int)blockMemoryStreamReader.BaseStream.Position;
transaction.TransactionVersion = blockMemoryStreamReader.ReadUInt32();
int inputsCount = (int)blockMemoryStreamReader.ReadVariableLengthInteger();
for (int inputIndex = 0; inputIndex < inputsCount; inputIndex++)
{
TransactionInput transactionInput = BlockchainParser.ParseTransactionInput(blockMemoryStreamReader);
transaction.AddInput(transactionInput);
}
int outputsCount = (int)blockMemoryStreamReader.ReadVariableLengthInteger();
for (int outputIndex = 0; outputIndex < outputsCount; outputIndex++)
{
TransactionOutput transactionOutput = BlockchainParser.ParseTransactionOutput(blockMemoryStreamReader);
transaction.AddOutput(transactionOutput);
}
// TODO: Need to find out more details about the semantic of TransactionLockTime.
transaction.TransactionLockTime = blockMemoryStreamReader.ReadUInt32();
if (transaction.TransactionVersion >= 2)
{
int joinSplitCount = (int)blockMemoryStreamReader.ReadVariableLengthInteger();
for (int jsIndex = 0; jsIndex < joinSplitCount; ++jsIndex)
{
JoinSplit joinSplit = BlockchainParser.ParseJoinSplit(blockMemoryStreamReader);
transaction.AddJoinSplit(joinSplit);
}
if (joinSplitCount > 0)
{
transaction.JoinSplitPublicKey = new ByteArray(blockMemoryStreamReader.ReadBytes(32));
transaction.JoinSplitSignature = new ByteArray(blockMemoryStreamReader.ReadBytes(64));
}
}
int positionInBaseStreamAfterTransactionEnd = (int)blockMemoryStreamReader.BaseStream.Position;
using (SHA256Managed sha256 = new SHA256Managed())
{
//// We need to calculate the double SHA256 hash of this transaction.
//// We need to access the buffer that contains the transaction that we jut read through.
//// Here we take advantage of the fact that the entire block was loaded as an in-memory buffer.
//// The base stream of blockMemoryStreamReader is that in-memory buffer.
byte[] baseBuffer = blockMemoryStreamReader.GetBuffer();
int transactionBufferSize = positionInBaseStreamAfterTransactionEnd - positionInBaseStreamAtTransactionStart;
byte[] hash1 = sha256.ComputeHash(baseBuffer, positionInBaseStreamAtTransactionStart, transactionBufferSize);
transaction.TransactionHash = new ByteArray(sha256.ComputeHash(hash1).ReverseByteArray());
}
return(transaction);
}
