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Add MS-CAB DecompressBlocks helper

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This commit is contained in:
Matt Nadareski
2025-07-28 13:18:10 -04:00
parent 32c9ea7838
commit be50d1343e
1 changed files with 62 additions and 53 deletions
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115
BinaryObjectScanner/FileType/MicrosoftCAB.cs
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@@ -41,60 +41,10 @@ namespace BinaryObjectScanner.FileType
// Loop through the folders
for (int f = 0; f < cabArchive!.Model.Folders.Length; f++)
{
// Ensure data blocks
// Decompress the blocks, if possible
var folder = cabArchive.Model.Folders[f];
if (folder?.DataBlocks == null || folder.DataBlocks.Length == 0)
continue;
// Setup decompressors
var mszip = SabreTools.Compression.MSZIP.Decompressor.Create();
uint quantumWindowBits = (uint)(((ushort)folder.CompressionType >> 8) & 0x1f);
// Loop through the data blocks
var ms = new MemoryStream();
foreach (var db in folder.DataBlocks)
{
if (db?.CompressedData == null)
continue;
// Uncompressed data
if ((folder.CompressionType & CompressionType.TYPE_NONE) != 0)
{
ms.Write(db.CompressedData, 0, db.CompressedData.Length);
ms.Flush();
}
// MS-ZIP
else if ((folder.CompressionType & CompressionType.TYPE_MSZIP) != 0)
{
mszip.CopyTo(db.CompressedData, ms);
}
// Quantum
else if ((folder.CompressionType & CompressionType.TYPE_QUANTUM) != 0)
{
var quantum = SabreTools.Compression.Quantum.Decompressor.Create(db.CompressedData, quantumWindowBits);
byte[] data = quantum.Process();
ms.Write(data, 0, data.Length);
ms.Flush();
}
// LZX
else if ((folder.CompressionType & CompressionType.TYPE_LZX) != 0)
{
// TODO: Unsupported
continue;
}
// Unknown
else
{
continue;
}
}
// If no data was read
if (ms.Length == 0)
var ms = DecompressBlocks(cabArchive, folder);
if (ms == null || ms.Length == 0)
continue;
// Ensure files
@@ -168,6 +118,65 @@ namespace BinaryObjectScanner.FileType
#endif
}
/// <summary>
/// Decompress all blocks for a folder
/// </summary>
private MemoryStream? DecompressBlocks(SabreTools.Serialization.Wrappers.MicrosoftCabinet cabArchive, CFFOLDER? folder)
{
// Ensure data blocks
if (folder?.DataBlocks == null || folder.DataBlocks.Length == 0)
return null;
// Setup decompressors
var mszip = SabreTools.Compression.MSZIP.Decompressor.Create();
uint quantumWindowBits = (uint)(((ushort)folder.CompressionType >> 8) & 0x1f);
// Loop through the data blocks
var ms = new MemoryStream();
foreach (var db in folder.DataBlocks)
{
if (db?.CompressedData == null)
continue;
// Uncompressed data
if ((folder.CompressionType & CompressionType.TYPE_NONE) != 0)
{
ms.Write(db.CompressedData, 0, db.CompressedData.Length);
ms.Flush();
}
// MS-ZIP
else if ((folder.CompressionType & CompressionType.TYPE_MSZIP) != 0)
{
mszip.CopyTo(db.CompressedData, ms);
}
// Quantum
else if ((folder.CompressionType & CompressionType.TYPE_QUANTUM) != 0)
{
var quantum = SabreTools.Compression.Quantum.Decompressor.Create(db.CompressedData, quantumWindowBits);
byte[] data = quantum.Process();
ms.Write(data, 0, data.Length);
ms.Flush();
}
// LZX
else if ((folder.CompressionType & CompressionType.TYPE_LZX) != 0)
{
// TODO: Unsupported
continue;
}
// Unknown
else
{
continue;
}
}
return ms;
}
/// <summary>
/// Get all files for the current folder index
/// </summary>