Merge pull request #72 from twostack/uint64-fixes

Bugfix: Uint64 error when using with Flutter Web

Author: stephanfeb

lib/src/encoding/utils.dart

@@ -176,6 +176,8 @@ BigInt readVarInt(Uint8List buffer) {
 Uint8List encodeBigIntSV(BigInt number) {
  int size = (number.bitLength + 7) >> 3;
 
+ if (size == 0) size = 8; //always padd to 64 bits if zero
+
  var result = Uint8List(size);
  for (int i = 0; i < size; i++) {
  result[size - i - 1] = (number & _byteMask).toInt();

lib/src/sighash.dart

@@ -324,7 +324,7 @@ class Sighash {
  writer.write(subscript.buffer);
 
  // value of the output spent by this input (8-byte little endian)
- writer.writeUint64(satoshis.toInt(), Endian.little);
+ writer.write(encodeBigIntSV(satoshis));
 
  // nSequence of the input (4-byte little endian)
  var sequenceNumber = input.sequenceNumber;

lib/src/transaction/transaction_output.dart

@@ -37,7 +37,8 @@ class TransactionOutput {
  /// being used.
  TransactionOutput.fromReader(ByteDataReader reader) {
 
- this.satoshis = BigInt.from(reader.readUint64(Endian.little));
+ var buffer = reader.read(8);
+ this.satoshis = castToBigInt(buffer, false, nMaxNumSize: 8);
  var size = readVarIntNum(reader);
  if (size != 0) {
  _script = SVScript.fromBuffer(reader.read(size, copy: true));