/// <summary>
/// Asyncronously reads <paramref name="count"/> bytes.
/// </summary>
/// <param name="count">The number of bytes to read.</param>
/// <returns>A <see cref="Task"/> that completes when the entire read operation has completed. The result of the task contains the array of bytes that was read.</returns>
/// <exception cref="EndOfStreamException">Thrown when the end of the stream is reached before the read is completed.</exception>
public static async Task <byte[]> ReadBytesAsync(this IReadBytes reader, int count)
{
var bytes = new byte[count];
await reader.ReadBytesAsync(bytes, 0, count).ConfigureAwait(false);
return(bytes);
}
public static double ReadFullDouble(this IReadBytes stream)
{
var bytes = new byte[8];
stream.ReadBytes(bytes, 0, 8);
return(BitConverter.ToDouble(bytes, 0));
}
/// <summary>
/// Reads <paramref name="count"/> bytes.
/// </summary>
/// <param name="count">The number of bytes to read.</param>
/// <returns>The array of bytes that was read.</returns>
/// <exception cref="EndOfStreamException">Thrown when the end of the stream is reached before the read is completed.</exception>
public static byte[] ReadBytes(this IReadBytes reader, int count)
{
var bytes = new byte[count];
reader.ReadBytes(bytes, 0, count);
return(bytes);
}
public static byte[] ReadRemaining(this IReadBytes reader)
{
using (var ms = new MemoryStream()) {
reader.CopyTo(ms.AsIWriteBytes());
return(ms.ToArray());
}
}
public static async Task <byte[]> ReadRemainingAsync(this IReadBytes reader)
{
using (var ms = new MemoryStream()) {
await reader.CopyToAsync(ms.AsIWriteBytes()).ConfigureAwait(false);
return(ms.ToArray());
}
}
public static double?ReadNullableFullDouble(this IReadBytes stream)
{
if (!stream.ReadCompressedBool())
{
return(null);
}
return(stream.ReadFullDouble());
}
public static T?ReadCompressedNullableEnum <T>(this IReadBytes stream) where T : struct, Enum
{
if (!stream.ReadCompressedBool())
{
return(null);
}
return(stream.ReadCompressedEnum <T>());
}
public static long?ReadCompressedNullableLong(this IReadBytes stream)
{
if (!stream.ReadCompressedBool())
{
return(null);
}
return(stream.ReadCompressedLong());
}
public static MonthStamp?ReadCompressedNullableMonthStamp(this IReadBytes stream)
{
if (!stream.ReadCompressedBool())
{
return(null);
}
return(stream.ReadCompressedMonthStamp());
}
public static decimal?ReadCompressedNullableDecimal(this IReadBytes stream)
{
if (!stream.ReadCompressedBool())
{
return(null);
}
return(stream.ReadCompressedDecimal());
}
public static DateTime?ReadCompressedNullableDateTime(this IReadBytes stream)
{
if (!stream.ReadCompressedBool())
{
return(null);
}
return(stream.ReadCompressedDateTime());
}
public static uint?ReadCompressedNullableUInt(this IReadBytes stream)
{
if (!stream.ReadCompressedBool())
{
return(null);
}
return(stream.ReadCompressedUInt());
}
public static byte[] ReadCompressedByteArray(this IReadBytes stream)
{
if (!stream.ReadCompressedBool())
{
return(null);
}
var length = (int)stream.ReadCompressedUInt();
return(stream.ReadBytes(length));
}
public static bool?ReadCompressedNullableBool(this IReadBytes stream)
{
var byteValue = stream.ReadByte();
if (byteValue == 2)
{
return(null);
}
return(byteValue == 1);
}
public static decimal ReadCompressedDecimal(this IReadBytes stream)
{
var bits = new int[4];
bits[0] = stream.ReadCompressedInt();
bits[1] = stream.ReadCompressedInt();
bits[2] = stream.ReadCompressedInt();
bits[3] = stream.ReadCompressedInt();
return(new decimal(bits));
}
public static double ReadDoubleOffset(this IReadBytes stream, double seed, double tickSize)
{
var numTicks = stream.ReadCompressedInt();
/// Since this is true 80% of the time in a trading platform, we use this optimization for significant performance gains.
if (numTicks == 0)
{
return(seed);
}
return(ToValue(tickSize, ToTicks(seed, tickSize) + numTicks));
}
public static string ReadCompressedString(this IReadBytes stream)
{
if (!stream.ReadCompressedBool())
{
return(null);
}
var length = (int)UIntCompressor.ReadCompressedUInt(stream);
var bytes = new byte[length];
stream.ReadBytes(bytes, 0, length);
return(Encoding.GetString(bytes));
}
public static ulong ReadCompressedULong(this IReadBytes stream)
{
ulong result = 0;
int shiftBits = 0;
ulong inputByte = (ulong)stream.ReadByte();
while ((inputByte < MORE_MASK))
{
result |= (inputByte) << shiftBits;
inputByte = (ulong)stream.ReadByte();
shiftBits += 7;
}
return(result | ((inputByte & DATA_MASK) << shiftBits));
}
public static uint ReadCompressedUInt(this IReadBytes stream)
{
uint result = 0;
int shiftBits = 0;
int inputByte = stream.ReadByte();
while ((inputByte < MORE_MASK))
{
result |= (uint)((inputByte) << shiftBits);
inputByte = stream.ReadByte();
shiftBits += 7;
}
return(result | (uint)((inputByte & DATA_MASK) << shiftBits));
}
public static MonthStamp ReadCompressedMonthStamp(this IReadBytes stream)
{
var value = (int)stream.ReadCompressedUInt();
return(new MonthStamp(value / 12, (value % 12) + 1));
}
public static TimeStamp ReadCompressedTimeStamp(this IReadBytes stream)
{
return(new TimeStamp(stream.ReadCompressedLong()));
}
public static DateTime ReadCompressedDateTime(this IReadBytes stream)
{
return(new DateTime(stream.ReadCompressedLong(), stream.ReadCompressedEnum <DateTimeKind>()));
}
public abstract T Decompress(IReadBytes stream);
object IDecompressor.Decompress(IReadBytes stream) => Decompress(stream);
public static T ReadCompressedEnum <T>(this IReadBytes stream) where T : Enum
{
return((T)(object)stream.ReadCompressedInt());
}
public static bool ReadCompressedBool(this IReadBytes stream)
{
return(stream.ReadByte() == 1);
}
public static DateStamp ReadCompressedDateStamp(this IReadBytes stream)
{
var value = (int)stream.ReadCompressedUInt();
return(new DateStamp(value / 100 / 12, (value / 100 % 12) + 1, value % 100));
}
public static long ReadCompressedLong(this IReadBytes input)
{
var value = input.ReadCompressedULong();
return((long)((value >> 1) ^ (~(value & 1) + 1)));
}
public override T Decompress(IReadBytes stream) => Read(stream);
public static int ReadCompressedInt(this IReadBytes input)
{
var value = input.ReadCompressedUInt();
return((int)((value >> 1) ^ (~(value & 1) + 1)));
}
