/// <summary>
/// Reads the <see cref="StackInt"/> value from the given <see cref="FastStreamReader"/>.
/// Return value indicates success.
/// </summary>
/// <param name="stream">Stream containing the <see cref="StackInt"/></param>
/// <param name="bytes">
/// If the <see cref="StackInt"/> is not strictly encoded it will contain the wrong encoding, otherwise will be null.
/// </param>
/// <param name="result">The result</param>
/// <param name="error">Error message (null if sucessful, otherwise will contain information about the failure).</param>
/// <returns>True if reading was successful, false if otherwise.</returns>
public static bool TryRead(FastStreamReader stream, out byte[] bytes, out StackInt result, out string error)
{
error = null;
bytes = null;
if (stream is null)
{
result = 0;
error = "Stream can not be null.";
return(false);
}
if (!stream.TryReadByte(out byte firstByte))
{
result = 0;
error = Err.EndOfStream;
return(false);
}
if (firstByte < (byte)OP.PushData1)
{
result = new StackInt((uint)firstByte);
}
else if (firstByte == (byte)OP.PushData1)
{
if (!stream.TryReadByte(out byte val))
{
error = $"OP_{OP.PushData1} needs to be followed by at least one byte.";
result = 0;
return(false);
}
if (val < (byte)OP.PushData1)
{
bytes = new byte[2] {
firstByte, val
};
error = $"For OP_{OP.PushData1} the data value must be bigger than {(byte)OP.PushData1 - 1}.";
}
result = new StackInt((uint)val);
}
else if (firstByte == (byte)OP.PushData2)
{
if (!stream.TryReadByteArray(sizeof(ushort), out byte[] temp))
/// <summary>
/// Reads the <see cref="LockTime"/> value from the given <see cref="FastStreamReader"/>.
/// Return value indicates success.
/// </summary>
/// <param name="stream">Stream containing the <see cref="LockTime"/></param>
/// <param name="result">The result</param>
/// <param name="error">Error message (null if sucessful, otherwise will contain information about the failure).</param>
/// <returns>True if reading was successful, false if otherwise.</returns>
public static bool TryRead(FastStreamReader stream, out LockTime result, out string error)
{
if (stream is null)
{
result = 0;
error = "Stream can not be null.";
return(false);
}
if (!stream.TryReadUInt32(out uint val))
{
result = 0;
error = Err.EndOfStream;
return(false);
}
result = new LockTime(val);
error = null;
return(true);
}
/// <summary>
/// Reads the <see cref="CompactInt"/> value from the given<see cref="FastStreamReader"/>.
/// The return value indicates success.
/// </summary>
/// <param name="stream">Stream containing the <see cref="CompactInt"/></param>
/// <param name="result">The result</param>
/// <param name="error">Error message (null if sucessful, otherwise will contain information about the failure).</param>
/// <returns>True if reading was successful, false if otherwise.</returns>
public static bool TryRead(FastStreamReader stream, out CompactInt result, out string error)
{
result = 0;
if (stream is null)
{
error = "Stream can not be null.";
return(false);
}
if (!stream.TryReadByte(out byte firstByte))
{
error = Err.EndOfStream;
return(false);
}
if (firstByte <= 252)
{
result = new CompactInt((ulong)firstByte);
}
else if (firstByte == 253) // 0xfd-XX-XX
{
if (!stream.TryReadUInt16(out ushort val))
{
error = "First byte 253 needs to be followed by at least 2 byte.";
result = 0;
return(false);
}
if (val <= 252)
{
error = $"For values less than 253, one byte format of {nameof(CompactInt)} should be used.";
result = 0;
return(false);
}
result = new CompactInt((ulong)val);
}
else if (firstByte == 254) // 0xfe-XX-XX-XX-XX
{
if (!stream.TryReadUInt32(out uint val))
{
error = "First byte 254 needs to be followed by at least 4 byte.";
result = 0;
return(false);
}
if (val <= ushort.MaxValue)
{
error = "For values less than 2 bytes, the [253, ushort] format should be used.";
result = 0;
return(false);
}
result = new CompactInt((ulong)val);
}
else if (firstByte == 255) //0xff-XX-XX-XX-XX-XX-XX-XX-XX
{
if (!stream.TryReadUInt64(out ulong val))
{
error = "First byte 255 needs to be followed by at least 8 byte.";
result = 0;
return(false);
}
if (val <= uint.MaxValue)
{
error = "For values less than 4 bytes, the [254, uint] format should be used.";
result = 0;
return(false);
}
result = new CompactInt(val);
}
error = null;
return(true);
}
/// <summary>
/// Reads the <see cref="StackInt"/> value from the given <see cref="FastStreamReader"/>.
/// Return value indicates success.
/// </summary>
/// <param name="stream">Stream containing the <see cref="StackInt"/></param>
/// <param name="isStrict">Determines if strict rules (shortest encoding possible) should be enforced</param>
/// <param name="result">The result</param>
/// <param name="error">Error message (null if sucessful, otherwise will contain information about the failure).</param>
/// <returns>True if reading was successful, false if otherwise.</returns>
public static bool TryRead(FastStreamReader stream, bool isStrict, out StackInt result, out string error)
{
if (stream is null)
{
result = 0;
error = "Stream can not be null.";
return(false);
}
if (!stream.TryReadByte(out byte firstByte))
{
result = 0;
error = Err.EndOfStream;
return(false);
}
if (firstByte < (byte)OP.PushData1)
{
result = new StackInt((uint)firstByte);
}
else if (firstByte == (byte)OP.PushData1)
{
if (!stream.TryReadByte(out byte val))
{
error = $"OP_{OP.PushData1} needs to be followed by at least one byte.";
result = 0;
return(false);
}
if (isStrict && val < (byte)OP.PushData1)
{
error = $"For OP_{OP.PushData1} the data value must be bigger than {(byte)OP.PushData1 - 1}.";
result = 0;
return(false);
}
result = new StackInt((uint)val);
}
else if (firstByte == (byte)OP.PushData2)
{
if (!stream.TryReadUInt16(out ushort val))
{
error = $"OP_{OP.PushData2} needs to be followed by at least two byte.";
result = 0;
return(false);
}
if (isStrict && val <= byte.MaxValue)
{
error = $"For OP_{OP.PushData2} the data value must be bigger than {byte.MaxValue}.";
result = 0;
return(false);
}
result = new StackInt((uint)val);
}
else if (firstByte == (byte)OP.PushData4)
{
if (!stream.TryReadUInt32(out uint val))
{
error = $"OP_{OP.PushData4} needs to be followed by at least 4 byte.";
result = 0;
return(false);
}
if (isStrict && val <= ushort.MaxValue)
{
error = $"For OP_{OP.PushData4} the data value must be bigger than {ushort.MaxValue}.";
result = 0;
return(false);
}
result = new StackInt(val);
}
else
{
error = "Unknown OP_Push value.";
result = 0;
return(false);
}
error = null;
return(true);
}
