/// <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 &&
blockHeader.BlockVersion != 0x20000007 &&
blockHeader.BlockVersion != 0x30000000 &&
blockHeader.BlockVersion != 4 &&
blockHeader.BlockVersion != 0x20000000 &&
blockHeader.BlockVersion != 0x20000001 &&
blockHeader.BlockVersion != 0x30000001 &&
blockHeader.BlockVersion != 0x08000004 &&
blockHeader.BlockVersion != 0x20000002 &&
blockHeader.BlockVersion != 0x30000007 &&
blockHeader.BlockVersion != 0x20000004)
{
throw new UnknownBlockVersionException(string.Format(CultureInfo.InvariantCulture, "Unknown block version: {0} ({0:X}).", 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);
}
/// <summary>
/// Parses a Bitcoin transaction input.
/// </summary>
/// <param name="blockMemoryStreamReader">
/// Provides access to a section of the Bitcoin blockchain file.
/// </param>
/// <returns>
/// The Bitcoin transaction input that was parsed.
/// </returns>
private static TransactionInput ParseTransactionInput(BlockMemoryStreamReader blockMemoryStreamReader)
{
TransactionInput transactionInput = new TransactionInput();
transactionInput.SourceTransactionHash = new ByteArray(blockMemoryStreamReader.ReadBytes(32).ReverseByteArray());
transactionInput.SourceTransactionOutputIndex = blockMemoryStreamReader.ReadUInt32();
int scriptLength = (int)blockMemoryStreamReader.ReadVariableLengthInteger();
// Ignore the script portion.
transactionInput.InputScript = new ByteArray(blockMemoryStreamReader.ReadBytes(scriptLength));
// Ignore the sequence number.
blockMemoryStreamReader.SkipBytes(4);
return(transactionInput);
}
/// <summary>
/// Parses a Bitcoin transaction output.
/// </summary>
/// <param name="blockMemoryStreamReader">
/// Provides access to a section of the Bitcoin blockchain file.
/// </param>
/// <returns>
/// The Bitcoin transaction output that was parsed.
/// </returns>
private static TransactionOutput ParseTransactionOutput(BlockMemoryStreamReader blockMemoryStreamReader)
{
TransactionOutput transactionOutput = new TransactionOutput();
transactionOutput.OutputValueSatoshi = blockMemoryStreamReader.ReadUInt64();
int scriptLength = (int)blockMemoryStreamReader.ReadVariableLengthInteger();
transactionOutput.OutputScript = new ByteArray(blockMemoryStreamReader.ReadBytes(scriptLength));
return(transactionOutput);
}
private static Witness ParseWitness(BlockMemoryStreamReader blockMemoryStreamReader)
{
Witness witness = new Witness();
int witnessStackCount = (int)blockMemoryStreamReader.ReadVariableLengthInteger();
witness.WitnessStack = new List <ByteArray>();
for (int witnessStackIndex = 0; witnessStackIndex < witnessStackCount; witnessStackIndex++)
{
int witnessSize = (int)blockMemoryStreamReader.ReadVariableLengthInteger();
witness.WitnessStack.Add(new ByteArray(blockMemoryStreamReader.ReadBytes(witnessSize)));
}
return(witness);
}
/// <summary>
/// Parses a Bitcoin transaction output.
/// </summary>
/// <param name="blockMemoryStreamReader">
/// Provides access to a section of the Bitcoin blockchain file.
/// </param>
/// <returns>
/// The Bitcoin transaction output that was parsed.
/// </returns>
private static TransactionOutput ParseTransactionOutput(BlockMemoryStreamReader blockMemoryStreamReader)
{
TransactionOutput transactionOutput = new TransactionOutput();
transactionOutput.OutputValueSatoshi = blockMemoryStreamReader.ReadUInt64();
int scriptLength = (int)blockMemoryStreamReader.ReadVariableLengthInteger();
byte[] OutputScriptBytes = blockMemoryStreamReader.ReadBytes(scriptLength);
transactionOutput.OutputScript = new ByteArray(OutputScriptBytes);
//this is new add to parse address, if can't parse the address, set the address = '0'
byte[] outputAddress;
if (scriptLength > 2)
{
using (BlockMemoryStreamReader outputScriptReader = new BlockMemoryStreamReader(OutputScriptBytes))
{
byte first = outputScriptReader.ReadByte();
if (first == 0x6a)//RETURN: can't parse the address
{
outputAddress = System.Text.Encoding.ASCII.GetBytes("0");
}
else if (first == 0x00 && (OutputScriptBytes[1] == 0x14 || OutputScriptBytes[1] == 0x20))//witness addr
{
int hash_len = outputScriptReader.ReadByte();
byte[] addr_hash = outputScriptReader.ReadBytes(hash_len);
outputAddress = Bench32.SegwitAddrEncode("bc", 0, addr_hash, addr_hash.Length);
}
else if (first == 0x76 && OutputScriptBytes[1] == 0xa9)//normal bitcoin addr,base58check encode and prefix = 0
{
outputScriptReader.ReadByte();
int hash_len = outputScriptReader.ReadByte();
byte[] addr_hash = outputScriptReader.ReadBytes(hash_len);
outputAddress = Base58.EncodeBase58Check(addr_hash, addr_hash.Length, 0);
}
else if (first == 0xa9 && (OutputScriptBytes[1] == 0x14 || OutputScriptBytes[1] == 0x20))//base58check encode and prefix = 5
{
int hash_len = outputScriptReader.ReadByte();
byte[] addr_hash = outputScriptReader.ReadBytes(hash_len);
outputAddress = Base58.EncodeBase58Check(addr_hash, addr_hash.Length, 1);
}
else if (first == 0x41)//非压缩公钥
{
byte[] bitcoin_addr = outputScriptReader.ReadBytes(65);
byte[] addr_hash = Hash160.hash160(bitcoin_addr);
outputAddress = Base58.EncodeBase58Check(addr_hash, addr_hash.Length, 0);
}
else
{
/*
* string str = string.Empty;
* foreach (byte item in OutputScriptBytes)
* {
* str += string.Format("{0:x2}", item);
* }
* Console.WriteLine(str);
*/
outputAddress = System.Text.Encoding.ASCII.GetBytes("0");
}
}
}
else
{
/*
* Console.WriteLine(scriptLength);
* string str = string.Empty;
* foreach (byte item in OutputScriptBytes)
* {
* str += string.Format("{0:x2}", item);
* }
* Console.WriteLine(str);
*/
outputAddress = System.Text.Encoding.ASCII.GetBytes("0");
}
transactionOutput.OutputAddress = new ByteArray(outputAddress);
return(transactionOutput);
}
/// <summary>
/// Parses a Bitcoin transaction output.
/// </summary>
/// <param name="blockMemoryStreamReader">
/// Provides access to a section of the Bitcoin blockchain file.
/// </param>
/// <returns>
/// The Bitcoin transaction output that was parsed.
/// </returns>
private static TransactionOutput ParseTransactionOutput(BlockMemoryStreamReader blockMemoryStreamReader)
{
TransactionOutput transactionOutput = new TransactionOutput();
transactionOutput.OutputValueSatoshi = blockMemoryStreamReader.ReadUInt64();
int scriptLength = (int)blockMemoryStreamReader.ReadVariableLengthInteger();
transactionOutput.OutputScript = new ByteArray(blockMemoryStreamReader.ReadBytes(scriptLength));
return transactionOutput;
}
/// <summary>
/// Parses a Bitcoin transaction input.
/// </summary>
/// <param name="blockMemoryStreamReader">
/// Provides access to a section of the Bitcoin blockchain file.
/// </param>
/// <returns>
/// The Bitcoin transaction input that was parsed.
/// </returns>
private static TransactionInput ParseTransactionInput(BlockMemoryStreamReader blockMemoryStreamReader)
{
TransactionInput transactionInput = new TransactionInput();
transactionInput.SourceTransactionHash = new ByteArray(blockMemoryStreamReader.ReadBytes(32).ReverseByteArray());
transactionInput.SourceTransactionOutputIndex = blockMemoryStreamReader.ReadUInt32();
int scriptLength = (int)blockMemoryStreamReader.ReadVariableLengthInteger();
// Ignore the script portion.
transactionInput.InputScript = new ByteArray(blockMemoryStreamReader.ReadBytes(scriptLength));
// Ignore the sequence number.
blockMemoryStreamReader.SkipBytes(4);
return transactionInput;
}
/// <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;
}
