SabreTools/SabreTools.Serialization
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Add experimental tar extraction

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This commit is contained in:
Matt Nadareski
2025-08-28 12:56:43 -04:00
parent 95a9f4769d
commit e6497289da
1 changed files with 146 additions and 4 deletions
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150
SabreTools.Serialization/Wrappers/TapeArchive.cs
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@@ -1,4 +1,6 @@
using System;
using System.IO;
using System.Text;
using SabreTools.Models.TAR;
using SabreTools.Serialization.Interfaces;
#if NET462_OR_GREATER || NETCOREAPP
@@ -146,17 +148,17 @@ namespace SabreTools.Serialization.Wrappers
entry.WriteToFile(filename);
}
catch (System.Exception ex)
catch (Exception ex)
{
if (includeDebug) System.Console.Error.WriteLine(ex);
if (includeDebug) Console.Error.WriteLine(ex);
}
}
return true;
}
catch (System.Exception ex)
catch (Exception ex)
{
if (includeDebug) System.Console.Error.WriteLine(ex);
if (includeDebug) Console.Error.WriteLine(ex);
return false;
}
#else
@@ -164,6 +166,146 @@ namespace SabreTools.Serialization.Wrappers
#endif
}
/// <inheritdoc cref="Extract(string, bool)"/>
public bool ExtractExperimental(string outputDirectory, bool includeDebug)
{
// Ensure there are entries to extract
if (Entries == null || Entries.Length == 0)
return true;
try
{
// Loop through and extract the data
for (int i = 0; i < Entries.Length; i++)
{
var entry = Entries[i];
if (entry.Header == null)
continue;
// Handle special entries
var header = entry.Header;
switch (header.TypeFlag)
{
// Skipped types
case TypeFlag.LNKTYPE:
case TypeFlag.SYMTYPE:
case TypeFlag.CHRTYPE:
case TypeFlag.BLKTYPE:
case TypeFlag.FIFOTYPE:
case TypeFlag.XHDTYPE:
case TypeFlag.XGLTYPE:
continue;
// Skipped vendor types
case TypeFlag.VendorSpecificA:
case TypeFlag.VendorSpecificB:
case TypeFlag.VendorSpecificC:
case TypeFlag.VendorSpecificD:
case TypeFlag.VendorSpecificE:
case TypeFlag.VendorSpecificF:
case TypeFlag.VendorSpecificG:
case TypeFlag.VendorSpecificH:
case TypeFlag.VendorSpecificI:
case TypeFlag.VendorSpecificJ:
case TypeFlag.VendorSpecificK:
case TypeFlag.VendorSpecificL:
case TypeFlag.VendorSpecificM:
case TypeFlag.VendorSpecificN:
case TypeFlag.VendorSpecificO:
case TypeFlag.VendorSpecificP:
case TypeFlag.VendorSpecificQ:
case TypeFlag.VendorSpecificR:
case TypeFlag.VendorSpecificS:
case TypeFlag.VendorSpecificT:
case TypeFlag.VendorSpecificU:
case TypeFlag.VendorSpecificV:
case TypeFlag.VendorSpecificW:
case TypeFlag.VendorSpecificX:
case TypeFlag.VendorSpecificY:
case TypeFlag.VendorSpecificZ:
continue;
// Directories
case TypeFlag.DIRTYPE:
string? entryDirectory = header.FileName?.TrimEnd('\0');
if (entryDirectory == null)
continue;
// Ensure directory separators are consistent
entryDirectory = Path.Combine(outputDirectory, entryDirectory);
if (Path.DirectorySeparatorChar == '\\')
entryDirectory = entryDirectory.Replace('/', '\\');
else if (Path.DirectorySeparatorChar == '/')
entryDirectory = entryDirectory.Replace('\\', '/');
// Create the director
Directory.CreateDirectory(entryDirectory);
continue;
}
// Ensure there are blocks to extract
if (entry.Blocks == null)
continue;
// Get the file size
string sizeOctalString = Encoding.ASCII.GetString(header.Size!).TrimEnd('\0');
if (sizeOctalString.Length == 0)
continue;
int entrySize = Convert.ToInt32(sizeOctalString, 8);
// Setup the temporary buffer
byte[] dataBytes = new byte[entrySize];
int dataBytesPtr = 0;
// Loop through and copy the bytes to the array for writing
int blockNumber = 0;
while (entrySize > 0)
{
// Exit early if block number is invalid
if (blockNumber >= entry.Blocks.Count)
break;
// Exit early if the block has no data
var block = entry.Blocks[blockNumber++];
if (block.Data == null || block.Data.Length != 512)
break;
int nextBytes = Math.Min(512, entrySize);
entrySize -= nextBytes;
Array.Copy(block.Data, 0, dataBytes, dataBytesPtr, nextBytes);
dataBytesPtr += nextBytes;
}
// Ensure directory separators are consistent
string filename = header.FileName?.TrimEnd('\0') ?? $"entry_{i}";
if (Path.DirectorySeparatorChar == '\\')
filename = filename.Replace('/', '\\');
else if (Path.DirectorySeparatorChar == '/')
filename = filename.Replace('\\', '/');
// Ensure the full output directory exists
filename = Path.Combine(outputDirectory, filename);
var directoryName = Path.GetDirectoryName(filename);
if (directoryName != null && !Directory.Exists(directoryName))
Directory.CreateDirectory(directoryName);
// Write the file
using var fs = File.Open(filename, FileMode.Create, FileAccess.Write, FileShare.None);
fs.Write(dataBytes);
fs.Flush();
}
return true;
}
catch (Exception ex)
{
if (includeDebug) Console.Error.WriteLine(ex);
return false;
}
}
#endregion
}
}