/// <summary>
/// Parses one Bitcoin block.
/// </summary>
/// <param name="blockchainFileName">
/// The name of the blockchain file that contains the block being parsed.
/// </param>
/// <param name="binaryReader">
/// Provides access to a Bitcoin blockchain file.
/// </param>
private ParserBlock ParseBlockchainFile(string blockchainFileName, BinaryReader binaryReader)
{
// There are some rare situations where a block is preceded by a section containing zero bytes.
if (binaryReader.SkipZeroBytes() == false)
{
// We reached the end of the file. There is no block to be parsed.
return(null);
}
UInt32 blockId = binaryReader.ReadUInt32();
if (blockId != this.blockMagicId)
{
throw new InvalidBlockchainContentException(string.Format(CultureInfo.InvariantCulture, "Invalid block Id: {0:X}. Expected: {1:X}", blockId, this.blockMagicId));
}
int blockLength = (int)binaryReader.ReadUInt32();
byte[] blockBuffer = binaryReader.ReadBytes(blockLength);
using (BlockMemoryStreamReader blockMemoryStreamReader = new BlockMemoryStreamReader(blockBuffer))
{
return(BlockchainParser.InternalParseBlockchainFile(blockBuffer,
blockchainFileName, blockMemoryStreamReader));
}
}
/// <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 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 one Bitcoin block except for a few fields before the actual block header.
/// </summary>
/// <param name="blockchainFileName">
/// The name of the blockchain file that contains the block being parsed.
/// </param>
/// <param name="blockMemoryStreamReader">
/// Provides access to a section of the Bitcoin blockchain file.
/// </param>
private static Block InternalParseBlockchainFile(string blockchainFileName, BlockMemoryStreamReader blockMemoryStreamReader)
{
BlockHeader blockHeader = BlockchainParser.ParseBlockHeader(blockMemoryStreamReader);
Block block = new Block(blockchainFileName, blockHeader);
int blockTransactionCount = (int)blockMemoryStreamReader.ReadVariableLengthInteger();
for (int transactionIndex = 0; transactionIndex < blockTransactionCount; transactionIndex++)
{
Transaction transaction = BlockchainParser.ParseTransaction(blockMemoryStreamReader);
block.AddTransaction(transaction);
}
return(block);
}
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 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.
/// </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();
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);
}
/// <summary>
/// Initializes a new instance of the <see cref="BlockchainParser" /> class.
/// </summary>
/// <param name="blockchainPath">
/// The path to the folder containing the blockchain files.
/// </param>
/// <param name="firstBlockchainFileName">
/// The name of the first blockchain file that should be processed from the series of blockchain files.
/// In the list of blockchain files ordered by name, any blockchain file that appears prior
/// to the file specified by this parameter will be ignored.
/// If null then all file from the series of blockchain files will be processed.
/// </param>
/// </param name="nextNblockDataFiles">
/// process the next N blockdata files. the default value is int.MaxValue.
/// </param>
/// <exception cref="InvalidBlockchainFilesException">
/// Thrown when the list of Bitcoin blockchain files is found to be invalid.
/// The blockchain folder must contain files named with the pattern "blkxxxxx.dat",
//ader.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;
//}
/// <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();
// 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;
//}
/// <summary>
/// Parses one Bitcoin block except for a few fields before the actual block header.
/// </summary>
/// <param name="blockchainFileName">
/// The name of the blockchain file that contains the block being parsed.
/// </param>
/// <param name="blockMemoryStreamReader">
/// Provides access to a section of the Bitcoin blockchain file.
/// </param>
private static ParserBlock InternalParseBlockchainFile(byte[] blockBuffer,
string blockchainFileName, BlockMemoryStreamReader blockMemoryStreamReader)
{
Block nblk = ParserBlock.Load(blockBuffer, NBitcoin.Network.Main);
ParserBlock block = new ParserBlock(nblk, blockBuffer.Length, blockchainFileName);
//BlockHeader blockHeader = BlockchainParser.ParseBlockHeader(blockMemoryStreamReader);
//Block block = new Block(blockBuffer, blockchainFileName, blockHeader);
//if (block.BlockHeader.BlockVersion < 0x20000002)
//{
//int blockTransactionCount = (int)blockMemoryStreamReader.ReadVariableLengthInteger();
// for (int transactionIndex = 0; transactionIndex < blockTransactionCount; transactionIndex++)
// {
// Transaction transaction = BlockchainParser.ParseTransaction(blockMemoryStreamReader);
// block.AddTransaction(transaction);
// }
//}
//else
//{
//NBitcoin.Block nblock = NBitcoin.Block.Load(blockBuffer, NBitcoin.Network.Main);
//foreach(NBitcoin.Transaction ntx in nblock.Transactions)
//{
// //block.AddTransaction()
//}
//}
//NBitcoin.Block nblock = NBitcoin.Block.Load(blockBuffer, NBitcoin.Network.Main);
return(block);
}
/// <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();
bool isSegWit = false;
if (inputsCount == 0)
{
byte flag = blockMemoryStreamReader.ReadByte();
if (flag != 0x01)
{
throw new InvalidBlockchainContentException(string.Format(CultureInfo.InvariantCulture,
"Unknown transaction serialization. No input transactions, but SegWit flag was {0} instead of 1.", flag));
}
inputsCount = (int)blockMemoryStreamReader.ReadVariableLengthInteger();
isSegWit = true;
}
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);
}
int positionInBaseStreamAfterTxOuts = (int)blockMemoryStreamReader.BaseStream.Position;
if (isSegWit)
{
for (int inputIndex = 0; inputIndex < inputsCount; inputIndex++)
{
Witness witness = BlockchainParser.ParseWitness(blockMemoryStreamReader);
transaction.AddWitness(witness);
}
}
// TODO: Need to find out more details about the semantic of TransactionLockTime.
transaction.TransactionLockTime = blockMemoryStreamReader.ReadUInt32();
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[] baseBuffer = blockMemoryStreamReader.GetBuffer(), hash1 = null;
if (isSegWit)
{
using (SHA256Managed innerSHA256 = new SHA256Managed())
{
//// SegWit transactions are still identified by their txid, which is double SHA256 of the old
//// serialization format (i.e. no marker, flag, or witness). So, we need to calculate the txid by
//// recreating the old format as the input to the hash algorithm.
// First, the version number
innerSHA256.TransformBlock(baseBuffer, positionInBaseStreamAtTransactionStart, 4, baseBuffer, positionInBaseStreamAtTransactionStart);
// Skip the marker and flag (each one byte), then read in txins and txouts (starting with txin count)
int txStart = positionInBaseStreamAtTransactionStart + 6;
int txSize = positionInBaseStreamAfterTxOuts - txStart;
innerSHA256.TransformBlock(baseBuffer, txStart, txSize, baseBuffer, txStart);
///// After the transactions comes the segregated witness data, which is not included in the txid.
///// The only thing left to add to calcualte the txid is nLockTime located in the last 4 bytes
int lockTimeStart = positionInBaseStreamAfterTransactionEnd - 4;
innerSHA256.TransformFinalBlock(baseBuffer, lockTimeStart, 4);
hash1 = innerSHA256.Hash;
}
}
else
{
int transactionBufferSize = positionInBaseStreamAfterTransactionEnd - positionInBaseStreamAtTransactionStart;
hash1 = sha256.ComputeHash(baseBuffer, positionInBaseStreamAtTransactionStart, transactionBufferSize);
}
// byte[] hash1 = sha256.ComputeHash(baseBuffer, positionInBaseStreamAtTransactionStart, transactionBufferSize);
transaction.TransactionHash = new ByteArray(sha256.ComputeHash(hash1).ReverseByteArray());
}
return(transaction);
}
/// <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 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 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.
/// </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();
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;
}
/// <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;
}
/// <summary>
/// Parses one Bitcoin block.
/// </summary>
/// <param name="blockchainFileName">
/// The name of the blockchain file that contains the block being parsed.
/// </param>
/// <param name="binaryReader">
/// Provides access to a Bitcoin blockchain file.
/// </param>
private static Block ParseBlockchainFile(string blockchainFileName, BinaryReader binaryReader)
{
// There are some rare situations where a block is preceded by a section containing zero bytes.
if (binaryReader.SkipZeroBytes() == false)
{
// We reached the end of the file. There is no block to be parsed.
return null;
}
UInt32 blockId = binaryReader.ReadUInt32();
if (blockId != BlockMagicId)
{
throw new InvalidBlockchainContentException(string.Format(CultureInfo.InvariantCulture, "Invalid block Id: {0:X}. Expected: {1:X}", blockId, BlockMagicId));
}
int blockLength = (int)binaryReader.ReadUInt32();
byte[] blockBuffer = binaryReader.ReadBytes(blockLength);
using (BlockMemoryStreamReader blockMemoryStreamReader = new BlockMemoryStreamReader(blockBuffer))
{
return BlockchainParser.InternalParseBlockchainFile(blockchainFileName, blockMemoryStreamReader);
}
}
/// <summary>
/// Parses one Bitcoin block except for a few fields before the actual block header.
/// </summary>
/// <param name="blockchainFileName">
/// The name of the blockchain file that contains the block being parsed.
/// </param>
/// <param name="blockMemoryStreamReader">
/// Provides access to a section of the Bitcoin blockchain file.
/// </param>
private static Block InternalParseBlockchainFile(string blockchainFileName, BlockMemoryStreamReader blockMemoryStreamReader)
{
BlockHeader blockHeader = BlockchainParser.ParseBlockHeader(blockMemoryStreamReader);
Block block = new Block(blockchainFileName, blockHeader);
int blockTransactionCount = (int)blockMemoryStreamReader.ReadVariableLengthInteger();
for (int transactionIndex = 0; transactionIndex < blockTransactionCount; transactionIndex++)
{
Transaction transaction = BlockchainParser.ParseTransaction(blockMemoryStreamReader);
block.AddTransaction(transaction);
}
return block;
}