88 lines
2.9 KiB
C#
88 lines
2.9 KiB
C#
//
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// Copyright (c) 2008-2011, Kenneth Bell
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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//
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using System;
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using DiscUtils.Streams;
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namespace DiscUtils.Iso9660
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{
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internal class BootValidationEntry
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{
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private readonly byte[] _data;
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public byte HeaderId;
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public string ManfId;
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public byte PlatformId;
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public BootValidationEntry()
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{
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HeaderId = 1;
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PlatformId = 0;
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ManfId = ".Net DiscUtils";
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}
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public BootValidationEntry(byte[] src, int offset)
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{
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_data = new byte[32];
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Array.Copy(src, offset, _data, 0, 32);
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HeaderId = _data[0];
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PlatformId = _data[1];
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ManfId = EndianUtilities.BytesToString(_data, 4, 24).TrimEnd('\0').TrimEnd(' ');
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}
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public bool ChecksumValid
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{
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get
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{
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ushort total = 0;
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for (int i = 0; i < 16; ++i)
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{
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total += EndianUtilities.ToUInt16LittleEndian(_data, i * 2);
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}
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return total == 0;
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}
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}
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internal void WriteTo(byte[] buffer, int offset)
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{
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Array.Clear(buffer, offset, 0x20);
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buffer[offset + 0x00] = HeaderId;
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buffer[offset + 0x01] = PlatformId;
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EndianUtilities.StringToBytes(ManfId, buffer, offset + 0x04, 24);
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buffer[offset + 0x1E] = 0x55;
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buffer[offset + 0x1F] = 0xAA;
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EndianUtilities.WriteBytesLittleEndian(CalcChecksum(buffer, offset), buffer, offset + 0x1C);
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}
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private static ushort CalcChecksum(byte[] buffer, int offset)
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{
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ushort total = 0;
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for (int i = 0; i < 16; ++i)
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{
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total += EndianUtilities.ToUInt16LittleEndian(buffer, offset + i * 2);
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}
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return (ushort)(0 - total);
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}
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}
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} |