/// <summary>
/// Initializes a new instance of the <see cref="Block"/> class.
/// </summary>
/// <param name="blockchainFileName">
/// The name of the Bitcoin blockchain file that contains this block.
/// </param>
/// <param name="blockHeader">
/// The block header.
/// </param>
public Block(string blockchainFileName, BlockHeader blockHeader)
{
this.BlockchainFileName = blockchainFileName;
this.BlockHeader = blockHeader;
this.transactions = new List<Transaction>();
this.Transactions = new ReadOnlyCollection<Transaction>(this.transactions);
}
public Block GenerateBlock(
ByteArray blockHash,
ByteArray transactionHash,
InputInfo[] inputs,
OutputInfo[] outputs)
{
BlockHeader blockHeader = new BlockHeader()
{
BlockHash = blockHash,
BlockNonce = 0,
BlockTargetDifficulty = 0,
BlockTimestamp = this.GetCurrentBlockTimeStamp(),
BlockTimestampUnix = 0,
BlockVersion = 1,
MerkleRootHash = ByteArray.Empty,
PreviousBlockHash = this.previousBlockHash,
};
this.blockTimeStamp = this.blockTimeStamp.AddDays(1);
string expectedFileName = string.Format(CultureInfo.InvariantCulture, "blk{0:00000}.dat", this.GetCurentBlockchainFileIndex());
Block block = new Block(expectedFileName, blockHeader);
Transaction transaction = new Transaction()
{
TransactionHash = transactionHash,
TransactionLockTime = 0,
TransactionVersion = 1,
};
foreach (InputInfo inputInfo in inputs)
{
TransactionInput transactionInput = new TransactionInput()
{
InputScript = ByteArray.Empty,
SourceTransactionHash = inputInfo.SourceTransactionHash,
SourceTransactionOutputIndex = inputInfo.SourceTransactionOutputIndex,
};
transaction.AddInput(transactionInput);
}
foreach (OutputInfo outputInfo in outputs)
{
TransactionOutput transactionOutput = new TransactionOutput()
{
OutputScript = ByteArray.Empty,
OutputValueSatoshi = (ulong)(outputInfo.OutputValueSatoshi * DatabaseGenerator.BtcToSatoshi),
};
transaction.AddOutput(transactionOutput);
}
block.AddTransaction(transaction);
this.previousBlockHash = block.BlockHeader.BlockHash;
return block;
}
/// <summary>
/// Parses a Bitcoin block header.
/// </summary>
/// <param name="blockMemoryStreamReader">
/// Provides access to a section of the Bitcoin blockchain file.
/// </param>
/// <returns>
/// The block header information.
/// </returns>
/// <exception cref="InvalidBlockchainContentException">
/// Thrown if the block version is unknown.
/// </exception>
private static BlockHeader ParseBlockHeader(BlockMemoryStreamReader blockMemoryStreamReader)
{
BlockHeader blockHeader = new BlockHeader();
int positionInBaseStreamAtBlockHeaderStart = (int)blockMemoryStreamReader.BaseStream.Position;
blockHeader.BlockVersion = blockMemoryStreamReader.ReadUInt32();
// TODO: We need to understand better what is different in V2 and V3.
if (blockHeader.BlockVersion != 1 && blockHeader.BlockVersion != 2 && blockHeader.BlockVersion != 3)
{
throw new UnknownBlockVersionException(string.Format(CultureInfo.InvariantCulture, "Unknown block version: {0}.", blockHeader.BlockVersion));
}
blockHeader.PreviousBlockHash = new ByteArray(blockMemoryStreamReader.ReadBytes(32).ReverseByteArray());
blockHeader.MerkleRootHash = new ByteArray(blockMemoryStreamReader.ReadBytes(32).ReverseByteArray());
blockHeader.BlockTimestampUnix = blockMemoryStreamReader.ReadUInt32();
blockHeader.BlockTimestamp = new DateTime(1970, 1, 1).AddSeconds(blockHeader.BlockTimestampUnix);
blockHeader.BlockTargetDifficulty = blockMemoryStreamReader.ReadUInt32();
blockHeader.BlockNonce = blockMemoryStreamReader.ReadUInt32();
int positionInBaseStreamAfterBlockHeaderEnd = (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 blockHeaderBufferSize = positionInBaseStreamAfterBlockHeaderEnd - positionInBaseStreamAtBlockHeaderStart;
if (blockHeaderBufferSize != ExpectedBlockHeaderBufferSize)
{
// We have a problem. The block header should be 80 bytes in size.
throw new InvalidBlockchainContentException(string.Format(CultureInfo.InvariantCulture, "Block header buffer size has an invalid length: {0}. Expected: {1}.", blockHeaderBufferSize, ExpectedBlockHeaderBufferSize));
}
byte[] hash1 = sha256.ComputeHash(baseBuffer, positionInBaseStreamAtBlockHeaderStart, blockHeaderBufferSize);
blockHeader.BlockHash = new ByteArray(sha256.ComputeHash(hash1).ReverseByteArray());
}
return blockHeader;
}
