protected void AdjustLength(int newArraySize, int adjustment)
{
if (Length == UnknownLength)
{
return;
}
// Our own length is now unknown if we have an unknown length adjustment.
if (adjustment == UnknownLength)
{
Length = UnknownLength;
return;
}
Length += adjustment;
// Check if we will need more bytes to encode the length prefix.
if (newArraySize == 1)
{
Length++;
} // The assumption here is we never call adjustLength with the same arraySize as before.
else if (newArraySize != 0)
{
Length += VarInt.SizeInBytesOf((ulong)newArraySize) - VarInt.SizeInBytesOf((ulong)(newArraySize - 1));
}
}
/**
* Used only in creation of the genesis block.
*/
TransactionInput(NetworkParameters params, Transaction parentTransaction, byte[] scriptBytes)
{
super(params);
this.scriptBytes = scriptBytes;
this.outpoint = new TransactionOutPoint(params, NO_SEQUENCE, (Transaction)null);
this.sequence = NO_SEQUENCE;
this.parentTransaction = parentTransaction;
length = 40 + (scriptBytes == null ? 1 : VarInt.SizeInBytesOf(scriptBytes.Length) + scriptBytes.length);
}
/// <summary>
/// Provides a reasonable guess at the byte length of the transactions part of the block.
/// The returned value will be accurate in 99% of cases and in those cases where not will probably slightly oversize.
/// This is used to preallocate the underlying byte array for a Stream.
/// If the size is under the real value the only penalty is resizing of the underlying byte array.
/// </summary>
/// <returns></returns>
private int guessTransactionsLength()
{
if (transactionBytesValid)
{
return(Bytes.Length - HeaderSize);
}
if (Transactions == null)
{
return(0);
}
int len = VarInt.SizeInBytesOf((ulong)Transactions.Count);
foreach (Transaction tx in Transactions)
{
len += tx.MessageSize == UnknownLength?255:tx.MessageSize;
} // 255 is just a guess at an average tx length
return(len);
}
/// <summary>
/// <exception cref="ProtocolException"/>
/// </summary>
private void parseTransactions()
{
if (transactionsParsed)
{
return;
}
Cursor = Offset + HeaderSize;
optimalEncodingMessageSize = HeaderSize;
if (Bytes.Length == Cursor)
{
// This message is just a header, it has no transactions.
transactionsParsed = true;
transactionBytesValid = false;
return;
}
ulong numTransactions = ReadVarInt().Value;
optimalEncodingMessageSize += VarInt.SizeInBytesOf(numTransactions);
Transactions = new List <Transaction>((int)numTransactions);
for (ulong i = 0; i < numTransactions; i++)
{
Transaction tx = new Transaction(Parameters, Bytes, Cursor, this, ParseLazy, ParseRetain, UnknownLength);
Transactions.Add(tx);
Cursor += tx.MessageSize;
optimalEncodingMessageSize += tx.OptimalEncodingMessageSize;
}
// No need to set length here. If length was not provided then it should be set at the end of parseLight().
// If this is a genuine lazy parse then length must have been provided to the constructor.
transactionsParsed = true;
transactionBytesValid = ParseRetain;
}