hondacrx
116 lines
3.3 KiB
C#
116 lines
3.3 KiB
C#
/*
|
|
* Copyright (C) 2012-2018 CypherCore <http://github.com/CypherCore>
|
|
*
|
|
* This program is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
using Framework.IO;
|
|
using System;
|
|
|
|
namespace Game.DataStorage
|
|
{
|
|
public class BitReader
|
|
{
|
|
private byte[] m_array;
|
|
private int m_readPos;
|
|
private int m_readOffset;
|
|
|
|
public int Position { get => m_readPos; set => m_readPos = value; }
|
|
public int Offset { get => m_readOffset; set => m_readOffset = value; }
|
|
public byte[] Data { get => m_array; set => m_array = value; }
|
|
|
|
public BitReader(byte[] data)
|
|
{
|
|
m_array = data;
|
|
}
|
|
|
|
public BitReader(byte[] data, int offset)
|
|
{
|
|
m_array = data;
|
|
m_readOffset = offset;
|
|
}
|
|
|
|
public uint ReadUInt32(int numBits)
|
|
{
|
|
uint result = FastStruct<uint>.ArrayToStructure(ref m_array[m_readOffset + (m_readPos >> 3)]) << (32 - numBits - (m_readPos & 7)) >> (32 - numBits);
|
|
m_readPos += numBits;
|
|
return result;
|
|
}
|
|
|
|
public ulong ReadUInt64(int bitWidth, int bitOffset)
|
|
{
|
|
int bitsToRead = bitOffset & 7;
|
|
ulong result = FastStruct<ulong>.ArrayToStructure(ref m_array[m_readOffset + (m_readPos >> 3)]) << (64 - bitsToRead - bitWidth) >> (64 - bitWidth);
|
|
m_readPos += bitWidth;
|
|
return result;
|
|
}
|
|
|
|
public Value64 ReadValue64(int bitWidth, int bitOffset = 0, bool isSigned = false)
|
|
{
|
|
unsafe
|
|
{
|
|
ulong result = ReadUInt64(bitWidth, bitOffset);
|
|
if (isSigned)
|
|
{
|
|
ulong mask = 1ul << (bitWidth - 1);
|
|
result = (result ^ mask) - mask;
|
|
}
|
|
|
|
return *(Value64*)&result;
|
|
}
|
|
}
|
|
}
|
|
|
|
public struct Value64
|
|
{
|
|
unsafe fixed byte Value[8];
|
|
|
|
public T GetValue<T>() where T : struct
|
|
{
|
|
unsafe
|
|
{
|
|
fixed (byte* ptr = Value)
|
|
return FastStruct<T>.ArrayToStructure(ref ptr[0]);
|
|
}
|
|
}
|
|
|
|
public byte[] GetBytes(int bitSize)
|
|
{
|
|
byte[] data = new byte[NextPow2((bitSize + 7) / 8)];
|
|
unsafe
|
|
{
|
|
fixed (byte* ptr = Value)
|
|
{
|
|
for (var i = 0; i < data.Length; ++i)
|
|
data[i] = ptr[i];
|
|
}
|
|
}
|
|
|
|
return data;
|
|
}
|
|
|
|
private int NextPow2(int v)
|
|
{
|
|
v--;
|
|
v |= v >> 1;
|
|
v |= v >> 2;
|
|
v |= v >> 4;
|
|
v |= v >> 8;
|
|
v |= v >> 16;
|
|
v++;
|
|
return Math.Max(v, 1);
|
|
}
|
|
}
|
|
}
|