hondacrx
73 lines
2.5 KiB
C#
73 lines
2.5 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 System.Runtime.CompilerServices;
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using System.Text;
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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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private byte[] m_data;
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private int m_bitPosition;
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private int m_offset;
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public int Position { get => m_bitPosition; set => m_bitPosition = value; }
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public int Offset { get => m_offset; set => m_offset = value; }
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public byte[] Data { get => m_data; set => m_data = value; }
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public BitReader(byte[] data)
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{
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m_data = data;
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}
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public BitReader(byte[] data, int offset)
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{
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m_data = data;
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m_offset = offset;
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}
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public T Read<T>(int numBits) where T : unmanaged
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{
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ulong result = Unsafe.As<byte, ulong>(ref m_data[m_offset + (m_bitPosition >> 3)]) << (64 - numBits - (m_bitPosition & 7)) >> (64 - numBits);
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m_bitPosition += numBits;
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return Unsafe.As<ulong, T>(ref result);
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}
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public T ReadSigned<T>(int numBits) where T : unmanaged
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{
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ulong result = Unsafe.As<byte, ulong>(ref m_data[m_offset + (m_bitPosition >> 3)]) << (64 - numBits - (m_bitPosition & 7)) >> (64 - numBits);
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m_bitPosition += numBits;
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ulong signedShift = (1UL << (numBits - 1));
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result = (signedShift ^ result) - signedShift;
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return Unsafe.As<ulong, T>(ref result);
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}
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public string ReadCString()
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{
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int start = m_bitPosition;
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while (m_data[m_offset + (m_bitPosition >> 3)] != 0)
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m_bitPosition += 8;
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string result = Encoding.UTF8.GetString(m_data, m_offset + (start >> 3), (m_bitPosition - start) >> 3);
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m_bitPosition += 8;
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return result;
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}
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}
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}
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