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105 lines
3.3 KiB
C#
105 lines
3.3 KiB
C#
/* This file is part of libmspack.
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* (C) 2003-2004 Stuart Caie.
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*
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* libmspack is free software; you can redistribute it and/or modify it under
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* the terms of the GNU Lesser General Public License (LGPL) version 2.1
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*
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* For further details, see the file COPYING.LIB distributed with libmspack
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*/
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using System;
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namespace LibMSPackSharp.CHM
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{
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internal class _HeaderSectionTable
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{
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#region Regular Table
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/// <summary>
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/// Header section 0 offset
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/// </summary>
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/// <remarks>0x0000</remarks>
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public long OffsetHS0 { get; private set; }
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/// <summary>
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/// Header section 0 length
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/// </summary>
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/// <remarks>0x0008</remarks>
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public long LengthHS0 { get; private set; }
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/// <summary>
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/// Header section 1 offset
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/// The file offset of the first PMGL/PMGI directory chunk.
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/// </summary>
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/// <remarks>
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/// 0x0010
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///
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/// This is internally settable because it has to be corrected in some cases
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/// </remarks>
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public long OffsetHS1 { get; internal set; }
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/// <summary>
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/// Header section 1 length
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/// </summary>
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/// <remarks>0x0018</remarks>
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public long LengthHS1 { get; private set; }
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/// <summary>
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/// Total size of the version 1 and 2 header section table in bytes
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/// </summary>
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public const int Size = 0x0020;
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#endregion
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#region Version 3 Table
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/// <summary>
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/// Header section 0 offset correct
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/// </summary>
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/// <remarks>0x0020</remarks>
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public long OffsetCS0 { get; private set; }
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/// <summary>
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/// Total size of the version 3 header section table in bytes
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/// </summary>
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public const int V3Size = 0x0028;
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#endregion
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/// <summary>
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/// Private constructor
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/// </summary>
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private _HeaderSectionTable() { }
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/// <summary>
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/// Create a _HeaderSectionTable from a byte array, if possible
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/// </summary>
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public static Error Create(byte[] buffer, out _HeaderSectionTable headerSectionTable)
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{
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headerSectionTable = null;
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if (buffer == null || buffer.Length < Size)
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return Error.MSPACK_ERR_READ;
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headerSectionTable = new _HeaderSectionTable();
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headerSectionTable.OffsetHS0 = BitConverter.ToInt64(buffer, 0x0000);
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headerSectionTable.LengthHS0 = BitConverter.ToInt64(buffer, 0x0008);
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headerSectionTable.OffsetHS1 = BitConverter.ToInt64(buffer, 0x0010);
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headerSectionTable.LengthHS1 = BitConverter.ToInt64(buffer, 0x0018);
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if (buffer.Length >= V3Size)
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{
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headerSectionTable.OffsetCS0 = BitConverter.ToInt64(buffer, 0x0020);
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}
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// OffsetCS0 does not exist in version 1 or 2 CHM files.
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// The offset will be corrected later, once HS1 is read.
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// TODO: Are these supposed to be == 0?
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if (headerSectionTable.OffsetHS0 != 0 || headerSectionTable.OffsetHS1 != 0 || headerSectionTable.OffsetCS0 != 0)
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return Error.MSPACK_ERR_DATAFORMAT;
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return Error.MSPACK_ERR_OK;
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}
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}
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}
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