public int ReadInt32(int numberOfBits)
{
int newPosition = bitPosition + numberOfBits;
if (overflow || newPosition > endBitPosition)
{
overflow = true;
return(0);
}
uint value = BitWriter.ReadUInt32(data, numberOfBits, bitPosition);
bitPosition += numberOfBits;
if (numberOfBits == 32)
{
return((int)value);
}
int signBit = 1 << (numberOfBits - 1);
if ((value & signBit) == 0)
{
return((int)value); // positive
}
// negative
unchecked
{
uint mask = ((uint)-1) >> (33 - numberOfBits);
uint tmp = (value & mask) + 1;
return(-((int)tmp));
}
}
public UInt32 ReadUInt32(int numberOfBits)
{
int newPosition = bitPosition + numberOfBits;
if (overflow || newPosition > endBitPosition)
{
overflow = true;
return(0);
}
uint value = BitWriter.ReadUInt32(data, numberOfBits, bitPosition);
bitPosition += numberOfBits;
return(value);
}
public uint ReadUInt32()
{
int newPosition = bitPosition + 32;
if (overflow || newPosition > endBitPosition)
{
overflow = true;
return(0);
}
uint value = BitWriter.ReadUInt32(data, 32, bitPosition);
bitPosition += 32;
return(value);
}
//public byte ReadInt16( int numberOfBits )
public ushort ReadUInt16()
{
int newPosition = bitPosition + 16;
if (overflow || newPosition > endBitPosition)
{
overflow = true;
return(0);
}
uint value = BitWriter.ReadUInt32(data, 16, bitPosition);
bitPosition = newPosition;
return((ushort)value);
}
public ulong ReadUInt64()
{
int newPosition = bitPosition + 64;
if (overflow || newPosition > endBitPosition)
{
overflow = true;
return(0);
}
ulong low = BitWriter.ReadUInt32(data, 32, bitPosition);
bitPosition += 32;
ulong high = BitWriter.ReadUInt32(data, 32, bitPosition);
bitPosition += 32;
ulong value = low + (high << 32);
return(value);
}
public ulong ReadUInt64(int numberOfBits)
{
int newPosition = bitPosition + numberOfBits;
if (overflow || newPosition > endBitPosition)
{
overflow = true;
return(0);
}
ulong value;
if (numberOfBits <= 32)
{
value = (ulong)BitWriter.ReadUInt32(data, numberOfBits, bitPosition);
}
else
{
value = BitWriter.ReadUInt32(data, 32, bitPosition);
value |= BitWriter.ReadUInt32(data, numberOfBits - 32, bitPosition) << 32;
}
bitPosition += numberOfBits;
return(value);
}