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Add MS-CAB GetDataBlocks helper

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This commit is contained in:
Matt Nadareski
2025-07-28 13:55:07 -04:00
parent 7cb318ce6d
commit d86dbf47b5
1 changed files with 36 additions and 5 deletions
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41
BinaryObjectScanner/FileType/MicrosoftCAB.cs
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@@ -43,7 +43,7 @@ namespace BinaryObjectScanner.FileType
{
// Decompress the blocks, if possible
var folder = cabArchive.Model.Folders[f];
var ms = DecompressBlocks(cabArchive, folder);
var ms = DecompressBlocks(cabArchive, folder, f);
if (ms == null || ms.Length == 0)
continue;
@@ -121,19 +121,20 @@ namespace BinaryObjectScanner.FileType
/// <summary>
/// Decompress all blocks for a folder
/// </summary>
private MemoryStream? DecompressBlocks(SabreTools.Serialization.Wrappers.MicrosoftCabinet cabArchive, CFFOLDER? folder)
private MemoryStream? DecompressBlocks(SabreTools.Serialization.Wrappers.MicrosoftCabinet cabArchive, CFFOLDER? folder, int folderIndex)
{
// Ensure data blocks
if (folder?.DataBlocks == null || folder.DataBlocks.Length == 0)
var dataBlocks = GetDataBlocks(cabArchive, folder, folderIndex);
if (dataBlocks == null || dataBlocks.Length == 0)
return null;
// Setup decompressors
var mszip = SabreTools.Compression.MSZIP.Decompressor.Create();
uint quantumWindowBits = (uint)(((ushort)folder.CompressionType >> 8) & 0x1f);
uint quantumWindowBits = (uint)(((ushort)folder!.CompressionType >> 8) & 0x1f);
// Loop through the data blocks
var ms = new MemoryStream();
foreach (var db in folder.DataBlocks)
foreach (var db in dataBlocks)
{
if (db?.CompressedData == null)
continue;
@@ -177,6 +178,36 @@ namespace BinaryObjectScanner.FileType
return ms;
}
/// <summary>
/// Get the set of data blocks for a folder
/// </summary>
private CFDATA[]? GetDataBlocks(SabreTools.Serialization.Wrappers.MicrosoftCabinet cabArchive, CFFOLDER? folder, int folderIndex)
{
// Skip invalid folders
if (folder?.DataBlocks == null || folder.DataBlocks.Length == 0)
return null;
// Get all files for the folder
var files = GetFiles(cabArchive, folderIndex);
if (files.Length == 0)
return folder.DataBlocks;
// Check if the folder spans backward
if (Array.Exists(files, f => f.FolderIndex == FolderIndex.CONTINUED_FROM_PREV || f.FolderIndex == FolderIndex.CONTINUED_PREV_AND_NEXT))
{
// TODO: Get the list of blocks from the last folder in the previous cabinet
}
// Check if the folder spans forward
if (Array.Exists(files, f => f.FolderIndex == FolderIndex.CONTINUED_TO_NEXT || f.FolderIndex == FolderIndex.CONTINUED_PREV_AND_NEXT))
{
// TODO: Get the list of blocks from the first folder in the next cabinet
}
// Return all found blocks
return [.. folder.DataBlocks];
}
/// <summary>
/// Get all files for the current folder index
/// </summary>