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Support for InstallShield CAB version <= 5.

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This commit is contained in:
IceReaper
2022-11-07 18:34:23 +01:00
committed by Gustas
parent e54b88a6cb
commit 0aced08204
1 changed files with 82 additions and 27 deletions
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109
OpenRA.Mods.Common/FileFormats/InstallShieldCABCompression.cs
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@@ -42,10 +42,14 @@ namespace OpenRA.Mods.Common.FileFormats
public readonly uint FirstFile;
public readonly uint LastFile;
public FileGroup(Stream stream, long offset)
public FileGroup(Stream stream, long offset, uint version)
{
var nameOffset = stream.ReadUInt32();
stream.Position += 18;
if (version <= 5)
stream.Position += 54;
FirstFile = stream.ReadUInt32();
LastFile = stream.ReadUInt32();
@@ -105,7 +109,7 @@ namespace OpenRA.Mods.Common.FileFormats
public readonly byte[] MD5;
public readonly uint NameOffset;
public readonly ushort DirectoryIndex;
public readonly uint DirectoryIndex;
public readonly uint LinkToPrevious;
public readonly uint LinkToNext;
@@ -113,33 +117,63 @@ namespace OpenRA.Mods.Common.FileFormats
public readonly ushort Volume;
public readonly string Filename;
public FileDescriptor(Stream stream, uint index, long tableOffset)
public FileDescriptor(Stream stream, uint index, long tableOffset, uint version)
{
Index = index;
Flags = (CABFlags)stream.ReadUInt16();
ExpandedSize = stream.ReadUInt32();
stream.Position += 4;
CompressedSize = stream.ReadUInt32();
stream.Position += 4;
DataOffset = stream.ReadUInt32();
stream.Position += 4;
MD5 = stream.ReadBytes(16);
if (version <= 5)
{
NameOffset = stream.ReadUInt32();
DirectoryIndex = stream.ReadUInt32();
Flags = (CABFlags)stream.ReadUInt16();
ExpandedSize = stream.ReadUInt32();
CompressedSize = stream.ReadUInt32();
stream.Position += 20;
DataOffset = stream.ReadUInt32();
stream.Position += 16;
NameOffset = stream.ReadUInt32();
DirectoryIndex = stream.ReadUInt16();
stream.Position += 12;
LinkToPrevious = stream.ReadUInt32();
LinkToNext = stream.ReadUInt32();
MD5 = new byte[16];
LinkToPrevious = 0;
LinkToNext = 0;
LinkFlags = 0;
Volume = 0;
LinkFlags = (LinkFlags)stream.ReadUInt8();
Volume = stream.ReadUInt16();
if ((Flags & CABFlags.FileInvalid) == 0)
{
var pos = stream.Position;
stream.Position = tableOffset + NameOffset;
Filename = stream.ReadASCIIZ();
stream.Position = pos;
}
else
Filename = "";
}
else
{
Flags = (CABFlags)stream.ReadUInt16();
ExpandedSize = stream.ReadUInt32();
stream.Position += 4;
CompressedSize = stream.ReadUInt32();
var pos = stream.Position;
stream.Position = tableOffset + NameOffset;
Filename = stream.ReadASCIIZ();
stream.Position = pos;
stream.Position += 4;
DataOffset = stream.ReadUInt32();
stream.Position += 4;
MD5 = stream.ReadBytes(16);
stream.Position += 16;
NameOffset = stream.ReadUInt32();
DirectoryIndex = stream.ReadUInt16();
stream.Position += 12;
LinkToPrevious = stream.ReadUInt32();
LinkToNext = stream.ReadUInt32();
LinkFlags = (LinkFlags)stream.ReadUInt8();
Volume = stream.ReadUInt16();
var pos = stream.Position;
stream.Position = tableOffset + NameOffset;
Filename = stream.ReadASCIIZ();
stream.Position = pos;
}
}
}
@@ -340,6 +374,7 @@ namespace OpenRA.Mods.Common.FileFormats
readonly Dictionary<string, FileDescriptor> index = new Dictionary<string, FileDescriptor>();
readonly Dictionary<int, Stream> volumes;
readonly uint version;
public InstallShieldCABCompression(Stream header, Dictionary<int, Stream> volumes)
{
@@ -348,7 +383,20 @@ namespace OpenRA.Mods.Common.FileFormats
if (header.ReadUInt32() != 0x28635349)
throw new InvalidDataException("Not an Installshield CAB package");
header.Position += 8;
var versionTmp = header.ReadUInt32();
// Logic taken from UnShield
// https://github.com/twogood/unshield/blob/1.5.1/lib/libunshield.c#L277-L288
if (versionTmp >> 24 == 1)
version = (versionTmp >> 12) & 0xf;
else if (versionTmp >> 24 == 2 || versionTmp >> 24 == 4)
{
version = versionTmp & 0xffff;
if (version != 0)
version /= 100;
}
header.Position += 4;
var cabDescriptorOffset = header.ReadUInt32();
header.Position = cabDescriptorOffset + 12;
var cabDescriptor = new CabDescriptor(header);
@@ -374,7 +422,7 @@ namespace OpenRA.Mods.Common.FileFormats
nextOffset = header.ReadUInt32();
header.Position = cabDescriptorOffset + descriptorOffset;
fileGroups.Add(new FileGroup(header, cabDescriptorOffset));
fileGroups.Add(new FileGroup(header, cabDescriptorOffset, version));
}
}
@@ -383,8 +431,15 @@ namespace OpenRA.Mods.Common.FileFormats
{
for (var i = fileGroup.FirstFile; i <= fileGroup.LastFile; i++)
{
header.Position = cabDescriptorOffset + cabDescriptor.FileTableOffset + cabDescriptor.FileTableOffset2 + i * 0x57;
var file = new FileDescriptor(header, i, cabDescriptorOffset + cabDescriptor.FileTableOffset);
if (version <= 5)
{
header.Position = cabDescriptorOffset + cabDescriptor.FileTableOffset + cabDescriptor.FileTableOffset2 + i * 4;
header.Position = cabDescriptorOffset + cabDescriptor.FileTableOffset + header.ReadUInt32();
}
else
header.Position = cabDescriptorOffset + cabDescriptor.FileTableOffset + cabDescriptor.FileTableOffset2 + i * 0x57;
var file = new FileDescriptor(header, i, cabDescriptorOffset + cabDescriptor.FileTableOffset, version);
var path = $"{fileGroup.Name}\\{directories[file.DirectoryIndex].Name}\\{file.Filename}";
index[path] = file;
}