508 lines
14 KiB
C#
508 lines
14 KiB
C#
#region Copyright & License Information
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/*
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* Copyright 2007-2016 The OpenRA Developers (see AUTHORS)
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* This file is part of OpenRA, which is free software. It is made
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* available to you under the terms of the GNU General Public License
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* as published by the Free Software Foundation. For more information,
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* see COPYING.
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*/
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#endregion
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Text.RegularExpressions;
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using ICSharpCode.SharpZipLib.Zip.Compression;
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namespace OpenRA.FileSystem
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{
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public sealed class InstallShieldCABExtractor : IReadOnlyPackage
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{
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const uint FileSplit = 0x1;
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const uint FileObfuscated = 0x2;
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const uint FileCompressed = 0x4;
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const uint FileInvalid = 0x8;
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const uint LinkPrev = 0x1;
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const uint LinkNext = 0x2;
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const uint MaxFileGroupCount = 71;
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#region Nested Structs
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struct FileGroup
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{
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public readonly string Name;
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public readonly uint FirstFile;
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public readonly uint LastFile;
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public FileGroup(Stream reader, long offset)
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{
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var nameOffset = reader.ReadUInt32();
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/* unknown */ reader.ReadBytes(18);
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FirstFile = reader.ReadUInt32();
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LastFile = reader.ReadUInt32();
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reader.Seek(offset + nameOffset, SeekOrigin.Begin);
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Name = reader.ReadASCIIZ();
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}
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}
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struct VolumeHeader
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{
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public readonly uint DataOffset;
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public readonly uint DataOffsetHigh;
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public readonly uint FirstFileIndex;
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public readonly uint LastFileIndex;
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public readonly uint FirstFileOffset;
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public readonly uint FirstFileOffsetHigh;
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public readonly uint FirstFileSizeExpanded;
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public readonly uint FirstFileSizeExpandedHigh;
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public readonly uint FirstFileSizeCompressed;
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public readonly uint FirstFileSizeCompressedHigh;
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public readonly uint LastFileOffset;
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public readonly uint LastFileOffsetHigh;
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public readonly uint LastFileSizeExpanded;
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public readonly uint LastFileSizeExpandedHigh;
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public readonly uint LastFileSizeCompressed;
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public readonly uint LastFileSizeCompressedHigh;
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public VolumeHeader(Stream reader)
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{
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DataOffset = reader.ReadUInt32();
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DataOffsetHigh = reader.ReadUInt32();
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FirstFileIndex = reader.ReadUInt32();
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LastFileIndex = reader.ReadUInt32();
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FirstFileOffset = reader.ReadUInt32();
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FirstFileOffsetHigh = reader.ReadUInt32();
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FirstFileSizeExpanded = reader.ReadUInt32();
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FirstFileSizeExpandedHigh = reader.ReadUInt32();
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FirstFileSizeCompressed = reader.ReadUInt32();
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FirstFileSizeCompressedHigh = reader.ReadUInt32();
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LastFileOffset = reader.ReadUInt32();
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LastFileOffsetHigh = reader.ReadUInt32();
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LastFileSizeExpanded = reader.ReadUInt32();
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LastFileSizeExpandedHigh = reader.ReadUInt32();
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LastFileSizeCompressed = reader.ReadUInt32();
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LastFileSizeCompressedHigh = reader.ReadUInt32();
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}
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}
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struct CommonHeader
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{
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public const long Size = 16;
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public readonly uint Version;
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public readonly uint VolumeInfo;
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public readonly long CabDescriptorOffset;
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public readonly uint CabDescriptorSize;
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public CommonHeader(Stream reader)
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{
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Version = reader.ReadUInt32();
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VolumeInfo = reader.ReadUInt32();
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CabDescriptorOffset = reader.ReadUInt32();
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CabDescriptorSize = reader.ReadUInt32();
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}
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}
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struct CabDescriptor
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{
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public readonly long FileTableOffset;
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public readonly uint FileTableSize;
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public readonly uint FileTableSize2;
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public readonly uint DirectoryCount;
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public readonly uint FileCount;
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public readonly long FileTableOffset2;
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public CabDescriptor(Stream reader, CommonHeader commonHeader)
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{
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reader.Seek(commonHeader.CabDescriptorOffset + 12, SeekOrigin.Begin);
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FileTableOffset = reader.ReadUInt32();
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/* unknown */ reader.ReadUInt32();
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FileTableSize = reader.ReadUInt32();
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FileTableSize2 = reader.ReadUInt32();
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DirectoryCount = reader.ReadUInt32();
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/* unknown */ reader.ReadBytes(8);
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FileCount = reader.ReadUInt32();
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FileTableOffset2 = reader.ReadUInt32();
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}
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}
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struct FileDescriptor
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{
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public readonly ushort Flags;
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public readonly uint ExpandedSize;
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public readonly uint CompressedSize;
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public readonly uint DataOffset;
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public readonly byte[] MD5;
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public readonly uint NameOffset;
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public readonly ushort DirectoryIndex;
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public readonly uint LinkToPrevious;
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public readonly uint LinkToNext;
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public readonly byte LinkFlags;
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public readonly ushort Volume;
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public readonly string Filename;
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public FileDescriptor(Stream reader, long tableOffset)
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{
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Flags = reader.ReadUInt16();
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ExpandedSize = reader.ReadUInt32();
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/* unknown */ reader.ReadUInt32();
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CompressedSize = reader.ReadUInt32();
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/* unknown */ reader.ReadUInt32();
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DataOffset = reader.ReadUInt32();
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/* unknown */ reader.ReadUInt32();
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MD5 = reader.ReadBytes(16);
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/* unknown */ reader.ReadBytes(16);
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NameOffset = reader.ReadUInt32();
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DirectoryIndex = reader.ReadUInt16();
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/* unknown */ reader.ReadBytes(12);
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LinkToPrevious = reader.ReadUInt32();
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LinkToNext = reader.ReadUInt32();
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LinkFlags = reader.ReadBytes(1)[0];
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Volume = reader.ReadUInt16();
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var posSave = reader.Position;
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reader.Seek(tableOffset + NameOffset, SeekOrigin.Begin);
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Filename = reader.ReadASCIIZ();
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reader.Seek(posSave, SeekOrigin.Begin);
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}
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}
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class CabReader : IDisposable
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{
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readonly FileSystem context;
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readonly FileDescriptor fileDes;
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public uint RemainingArchiveStream;
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public uint RemainingFileStream;
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readonly uint index;
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readonly string commonName;
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ushort volumeNumber;
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Stream cabFile;
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public CabReader(FileSystem context, FileDescriptor fileDes, uint index, string commonName)
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{
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this.fileDes = fileDes;
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this.index = index;
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this.commonName = commonName;
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this.context = context;
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volumeNumber = (ushort)(fileDes.Volume - 1u);
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RemainingArchiveStream = 0;
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if ((fileDes.Flags & FileCompressed) > 0)
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RemainingFileStream = fileDes.CompressedSize;
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else
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RemainingFileStream = fileDes.ExpandedSize;
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cabFile = null;
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NextFile(context);
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}
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public void CopyTo(Stream dest)
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{
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if ((fileDes.Flags & FileCompressed) != 0)
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{
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var inf = new Inflater(true);
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var buffer = new byte[165535];
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do
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{
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var bytesToExtract = cabFile.ReadUInt16();
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RemainingArchiveStream -= 2u;
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RemainingFileStream -= 2u;
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inf.SetInput(GetBytes(bytesToExtract));
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RemainingFileStream -= bytesToExtract;
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while (!inf.IsNeedingInput)
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{
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var inflated = inf.Inflate(buffer);
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dest.Write(buffer, 0, inflated);
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}
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inf.Reset();
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}
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while (RemainingFileStream > 0);
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}
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else
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{
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do
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{
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RemainingFileStream -= RemainingArchiveStream;
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dest.Write(GetBytes(RemainingArchiveStream), 0, (int)RemainingArchiveStream);
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}
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while (RemainingFileStream > 0);
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}
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}
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public byte[] GetBytes(uint count)
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{
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if (count < RemainingArchiveStream)
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{
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RemainingArchiveStream -= count;
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return cabFile.ReadBytes((int)count);
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}
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else
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{
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var outArray = new byte[count];
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var read = cabFile.Read(outArray, 0, (int)RemainingArchiveStream);
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if (RemainingFileStream > RemainingArchiveStream)
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{
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NextFile(context);
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RemainingArchiveStream -= (uint)cabFile.Read(outArray, read, (int)count - read);
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}
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return outArray;
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}
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}
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public void Dispose()
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{
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cabFile.Dispose();
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}
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void NextFile(FileSystem context)
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{
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if (cabFile != null)
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cabFile.Dispose();
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++volumeNumber;
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cabFile = context.Open("{0}{1}.cab".F(commonName, volumeNumber));
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if (cabFile.ReadUInt32() != 0x28635349)
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throw new InvalidDataException("Not an Installshield CAB package");
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uint fileOffset;
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if ((fileDes.Flags & FileSplit) != 0)
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{
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cabFile.Seek(CommonHeader.Size, SeekOrigin.Current);
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var head = new VolumeHeader(cabFile);
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if (index == head.LastFileIndex)
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{
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if ((fileDes.Flags & FileCompressed) != 0)
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RemainingArchiveStream = head.LastFileSizeCompressed;
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else
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RemainingArchiveStream = head.LastFileSizeExpanded;
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fileOffset = head.LastFileOffset;
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}
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else if (index == head.FirstFileIndex)
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{
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if ((fileDes.Flags & FileCompressed) != 0)
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RemainingArchiveStream = head.FirstFileSizeCompressed;
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else
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RemainingArchiveStream = head.FirstFileSizeExpanded;
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fileOffset = head.FirstFileOffset;
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}
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else
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throw new Exception("Cannot Resolve Remaining Stream");
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}
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else
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{
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if ((fileDes.Flags & FileCompressed) != 0)
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RemainingArchiveStream = fileDes.CompressedSize;
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else
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RemainingArchiveStream = fileDes.ExpandedSize;
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fileOffset = fileDes.DataOffset;
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}
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cabFile.Seek(fileOffset, SeekOrigin.Begin);
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}
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}
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#endregion
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readonly Stream hdrFile;
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readonly CommonHeader commonHeader;
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readonly CabDescriptor cabDescriptor;
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readonly List<uint> directoryTable;
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readonly Dictionary<uint, string> directoryNames = new Dictionary<uint, string>();
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readonly Dictionary<uint, FileDescriptor> fileDescriptors = new Dictionary<uint, FileDescriptor>();
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readonly Dictionary<string, uint> index = new Dictionary<string, uint>();
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readonly FileSystem context;
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public string Name { get; private set; }
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public IEnumerable<string> Contents { get { return index.Keys; } }
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public InstallShieldCABExtractor(FileSystem context, string hdrFilename)
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{
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var fileGroups = new List<FileGroup>();
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var fileGroupOffsets = new List<uint>();
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hdrFile = context.Open(hdrFilename);
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this.context = context;
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// Strips archive number AND file extension
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Name = Regex.Replace(hdrFilename, @"\d*\.[^\.]*$", "");
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var signature = hdrFile.ReadUInt32();
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if (signature != 0x28635349)
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throw new InvalidDataException("Not an Installshield CAB package");
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commonHeader = new CommonHeader(hdrFile);
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cabDescriptor = new CabDescriptor(hdrFile, commonHeader);
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/* unknown */ hdrFile.ReadBytes(14);
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for (var i = 0U; i < MaxFileGroupCount; ++i)
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fileGroupOffsets.Add(hdrFile.ReadUInt32());
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hdrFile.Seek(commonHeader.CabDescriptorOffset + cabDescriptor.FileTableOffset, SeekOrigin.Begin);
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directoryTable = new List<uint>();
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for (var i = 0U; i < cabDescriptor.DirectoryCount; ++i)
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directoryTable.Add(hdrFile.ReadUInt32());
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foreach (var offset in fileGroupOffsets)
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{
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var nextOffset = offset;
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while (nextOffset != 0)
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{
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hdrFile.Seek((long)nextOffset + 4 + commonHeader.CabDescriptorOffset, SeekOrigin.Begin);
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var descriptorOffset = hdrFile.ReadUInt32();
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nextOffset = hdrFile.ReadUInt32();
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hdrFile.Seek(descriptorOffset + commonHeader.CabDescriptorOffset, SeekOrigin.Begin);
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fileGroups.Add(new FileGroup(hdrFile, commonHeader.CabDescriptorOffset));
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}
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}
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hdrFile.Seek(commonHeader.CabDescriptorOffset + cabDescriptor.FileTableOffset + cabDescriptor.FileTableOffset2, SeekOrigin.Begin);
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foreach (var fileGroup in fileGroups)
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{
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for (var i = fileGroup.FirstFile; i <= fileGroup.LastFile; ++i)
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{
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AddFileDescriptorToList(i);
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var fileDescriptor = fileDescriptors[i];
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var fullFilePath = "{0}\\{1}\\{2}".F(fileGroup.Name, DirectoryName(fileDescriptor.DirectoryIndex), fileDescriptor.Filename);
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index.Add(fullFilePath, i);
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}
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}
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}
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public string DirectoryName(uint index)
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{
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if (directoryNames.ContainsKey(index))
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return directoryNames[index];
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hdrFile.Seek(commonHeader.CabDescriptorOffset +
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cabDescriptor.FileTableOffset +
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directoryTable[(int)index],
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SeekOrigin.Begin);
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var test = hdrFile.ReadASCIIZ();
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return test;
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}
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public bool Contains(string filename)
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{
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return index.ContainsKey(filename);
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}
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public uint DirectoryCount()
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{
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return cabDescriptor.DirectoryCount;
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}
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public string FileName(uint index)
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{
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if (!fileDescriptors.ContainsKey(index))
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AddFileDescriptorToList(index);
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return fileDescriptors[index].Filename;
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}
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void AddFileDescriptorToList(uint index)
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{
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hdrFile.Seek(commonHeader.CabDescriptorOffset +
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cabDescriptor.FileTableOffset +
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cabDescriptor.FileTableOffset2 +
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index * 0x57,
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SeekOrigin.Begin);
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var fd = new FileDescriptor(hdrFile,
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commonHeader.CabDescriptorOffset + cabDescriptor.FileTableOffset);
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fileDescriptors.Add(index, fd);
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}
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public uint FileCount()
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{
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return cabDescriptor.FileCount;
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}
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public void ExtractFile(uint index, string fileName)
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{
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Directory.CreateDirectory(Path.GetDirectoryName(fileName));
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using (var destfile = File.Open(fileName, FileMode.Create))
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GetContentById(index, destfile);
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}
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public Stream GetContentById(uint index)
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{
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var fileDes = fileDescriptors[index];
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if ((fileDes.Flags & FileInvalid) != 0)
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throw new Exception("File Invalid");
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if ((fileDes.LinkFlags & LinkPrev) != 0)
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return GetContentById(fileDes.LinkToPrevious);
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if ((fileDes.Flags & FileObfuscated) != 0)
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throw new NotImplementedException("Haven't implemented obfuscated files");
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var output = new MemoryStream((int)fileDes.ExpandedSize);
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using (var reader = new CabReader(context, fileDes, index, Name))
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reader.CopyTo(output);
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if (output.Length != fileDes.ExpandedSize)
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throw new Exception("Did not fully extract Expected = {0}, Got = {1}".F(fileDes.ExpandedSize, output.Length));
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output.Position = 0;
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return output;
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}
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public void GetContentById(uint index, Stream output)
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{
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var fileDes = fileDescriptors[index];
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if ((fileDes.Flags & FileInvalid) != 0)
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throw new Exception("File Invalid");
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if ((fileDes.LinkFlags & LinkPrev) != 0)
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{
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GetContentById(fileDes.LinkToPrevious, output);
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return;
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}
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if ((fileDes.Flags & FileObfuscated) != 0)
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throw new NotImplementedException("Haven't implemented obfuscated files");
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using (var reader = new CabReader(context, fileDes, index, Name))
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reader.CopyTo(output);
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if (output.Length != fileDes.ExpandedSize)
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throw new Exception("Did not fully extract Expected = {0}, Got = {1}".F(fileDes.ExpandedSize, output.Length));
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}
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public Stream GetStream(string fileName)
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{
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return GetContentById(index[fileName]);
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}
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public void Dispose()
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{
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hdrFile.Dispose();
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}
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}
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}
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