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using System;
using System.Collections;
namespace Ryujinx.Graphics.Texture
{
public class BitArrayStream
{
public BitArray BitsArray;
public int Position { get; private set; }
public BitArrayStream(BitArray bitArray)
{
BitsArray = bitArray;
Position = 0;
}
public short ReadBits(int length)
{
int retValue = 0;
for (int i = Position; i < Position + length; i++)
{
if (BitsArray[i])
{
retValue |= 1 << (i - Position);
}
}
Position += length;
return (short)retValue;
}
public int ReadBits(int start, int end)
{
int retValue = 0;
for (int i = start; i <= end; i++)
{
if (BitsArray[i])
{
retValue |= 1 << (i - start);
}
}
return retValue;
}
public int ReadBit(int index)
{
return Convert.ToInt32(BitsArray[index]);
}
public void WriteBits(int value, int length)
{
for (int i = Position; i < Position + length; i++)
{
BitsArray[i] = ((value >> (i - Position)) & 1) != 0;
}
Position += length;
}
public byte[] ToByteArray()
{
byte[] retArray = new byte[(BitsArray.Length + 7) / 8];
BitsArray.CopyTo(retArray, 0);
return retArray;
}
public static int Replicate(int value, int numberBits, int toBit)
{
if (numberBits == 0) return 0;
if (toBit == 0) return 0;
int tempValue = value & ((1 << numberBits) - 1);
int retValue = tempValue;
int resLength = numberBits;
while (resLength < toBit)
{
int comp = 0;
if (numberBits > toBit - resLength)
{
int newShift = toBit - resLength;
comp = numberBits - newShift;
numberBits = newShift;
}
retValue <<= numberBits;
retValue |= tempValue >> comp;
resLength += numberBits;
}
return retValue;
}
public static int PopCnt(int number)
{
int counter;
for (counter = 0; number != 0; counter++)
{
number &= number - 1;
}
return counter;
}
public static void Swap<T>(ref T lhs, ref T rhs)
{
T temp = lhs;
lhs = rhs;
rhs = temp;
}
// Transfers a bit as described in C.2.14
public static void BitTransferSigned(ref int a, ref int b)
{
b >>= 1;
b |= a & 0x80;
a >>= 1;
a &= 0x3F;
if ((a & 0x20) != 0) a -= 0x40;
}
}
}
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