hondacrx
87 lines
2.6 KiB
C#
87 lines
2.6 KiB
C#
/*
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* Copyright (C) 2012-2018 CypherCore <http://github.com/CypherCore>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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using Framework.IO;
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using System;
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namespace Game.DataStorage
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{
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public class BitReader
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{
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public BitReader(byte[] data)
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{
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m_array = data;
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}
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public BitReader(byte[] data, int offset)
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{
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m_array = data;
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m_readOffset = offset;
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}
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public uint ReadUInt32(int numBits)
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{
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uint result = BitConverter.ToUInt32(m_array, m_readOffset + (m_readPos >> 3)) << (32 - numBits - (m_readPos & 7)) >> (32 - numBits);
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m_readPos += numBits;
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return result;
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}
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public ulong ReadUInt64(int bitWidth, int bitOffset)
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{
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int bitsToRead = bitOffset & 7;
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ulong result = BitConverter.ToUInt64(m_array, m_readOffset + (m_readPos >> 3)) << (64 - bitsToRead - bitWidth) >> (64 - bitWidth);
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m_readPos += bitWidth;
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return result;
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}
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public byte[] ReadValue(int bitWidth, int bitOffset = 0, bool isSigned = false)
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{
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ulong result = ReadUInt64(bitWidth, bitOffset);
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if (isSigned)
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{
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ulong mask = 1ul << (bitWidth - 1);
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result = (result ^ mask) - mask;
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}
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var ulongBytes = BitConverter.GetBytes(result);
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byte[] data = new byte[NextPow2((bitWidth + 7) / 8)];
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Buffer.BlockCopy(ulongBytes, 0, data, 0, data.Length);
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return data;
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}
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private int NextPow2(int v)
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{
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v--;
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v |= v >> 1;
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v |= v >> 2;
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v |= v >> 4;
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v |= v >> 8;
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v |= v >> 16;
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v++;
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return Math.Max(v, 1);
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}
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public int Position { get => m_readPos; set => m_readPos = value; }
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public int Offset { get => m_readOffset; set => m_readOffset = value; }
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private byte[] m_array;
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private int m_readPos;
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private int m_readOffset;
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}
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}
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