/// <summary>
/// Initializes a new instance of the <see cref="MpqArchive"/> class.
/// </summary>
/// <param name="sourceStream">The <see cref="Stream"/> from which to load an <see cref="MpqArchive"/>.</param>
/// <param name="loadListFile">If <see langword="true"/>, automatically add filenames from the <see cref="MpqArchive"/>'s <see cref="ListFile"/> after the archive is initialized.</param>
/// <exception cref="ArgumentNullException">Thrown when the <paramref name="sourceStream"/> is <see langword="null"/>.</exception>
/// <exception cref="MpqParserException">Thrown when the <see cref="MpqHeader"/> could not be found, or when the MPQ format version is not 0.</exception>
public MpqArchive(Stream sourceStream, bool loadListFile = false)
{
_isStreamOwner = true;
_baseStream = sourceStream ?? throw new ArgumentNullException(nameof(sourceStream));
if (!TryLocateMpqHeader(_baseStream, out var mpqHeader, out _headerOffset))
{
throw new MpqParserException("Unable to locate MPQ header.");
}
_mpqHeader = mpqHeader;
_blockSize = BlockSizeModifier << _mpqHeader.BlockSize;
_archiveFollowsHeader = _mpqHeader.IsArchiveAfterHeader();
using (var reader = new BinaryReader(_baseStream, new UTF8Encoding(), true))
{
// Load hash table
_baseStream.Seek(_mpqHeader.HashTablePosition, SeekOrigin.Begin);
_hashTable = new HashTable(reader, _mpqHeader.HashTableSize);
// Load entry table
_baseStream.Seek(_mpqHeader.BlockTablePosition, SeekOrigin.Begin);
_blockTable = new BlockTable(reader, _mpqHeader.BlockTableSize, (uint)_headerOffset);
}
AddFileName(Signature.FileName);
AddFileName(ListFile.FileName);
AddFileName(Attributes.FileName);
if (loadListFile)
{
if (TryOpenFile(ListFile.FileName, out var listFileStream))
{
using var listFileReader = new StreamReader(listFileStream, leaveOpen: false);
AddFileNames(listFileReader.ReadListFile().FileNames);
}
}
}
/// <summary>
/// Initializes a new instance of the <see cref="MpqArchive"/> class.
/// </summary>
/// <param name="sourceStream">The <see cref="Stream"/> containing pre-archive data. Can be null.</param>
/// <param name="mpqFiles">The <see cref="MpqFile"/>s that should be added to the archive.</param>
/// <param name="hashTableSize">The desired size of the <see cref="BlockTable"/>. Larger size decreases the likelihood of hash collisions.</param>
/// <param name="blockSize">The size of blocks in compressed files, which is used to enable seeking.</param>
/// <param name="writeArchiveFirst">If true, the archive files will be positioned directly after the header. Otherwise, the hashtable and blocktable will come first.</param>
/// <exception cref="ArgumentNullException">Thrown when the <paramref name="mpqFiles"/> collection is null.</exception>
public MpqArchive(Stream?sourceStream, IEnumerable <MpqFile> inputFiles, ushort?hashTableSize = null, ushort blockSize = DefaultBlockSize, bool writeArchiveFirst = true)
{
_baseStream = AlignStream(sourceStream);
_headerOffset = _baseStream.Position;
_blockSize = BlockSizeModifier << blockSize;
_archiveFollowsHeader = writeArchiveFirst;
var mpqFiles = inputFiles.ToList();
var fileCount = (uint)(mpqFiles ?? throw new ArgumentNullException(nameof(mpqFiles))).Count;
_hashTable = new HashTable(Math.Max(hashTableSize ?? fileCount * 8, fileCount));
_blockTable = new BlockTable();
using (var writer = new BinaryWriter(_baseStream, new UTF8Encoding(false, true), true))
{
// Skip the MPQ header, since its contents will be calculated afterwards.
writer.Seek((int)MpqHeader.Size, SeekOrigin.Current);
// Write Archive
var fileIndex = 0U;
var fileOffset = _archiveFollowsHeader ? MpqHeader.Size : throw new NotImplementedException();
// var gaps = new List<(long Start, long Length)>();
var endOfStream = _baseStream.Position;
// Find files that cannot be decrypted, and need to have a specific position in the archive, because that position is used to calculate the encryption seed.
var mpqFixedPositionFiles = mpqFiles.Where(mpqFile => mpqFile.IsFilePositionFixed).OrderBy(mpqFile => mpqFile.MpqStream.FilePosition).ToArray();
if (mpqFixedPositionFiles.Length > 0)
{
if (mpqFixedPositionFiles.First() !.MpqStream.FilePosition < 0)
{
throw new NotSupportedException($"Cannot place files in front of the header.");
}
foreach (var mpqFixedPositionFile in mpqFixedPositionFiles)
{
var position = mpqFixedPositionFile.MpqStream.FilePosition;
if (position < endOfStream)
{
throw new ArgumentException($"Fixed position files overlap with each other and/or the header. Archive cannot be created.", nameof(inputFiles));
}
if (position > endOfStream)
{
var gapSize = position - endOfStream;
// gaps.Add((endOfStream, gapSize));
writer.Seek((int)gapSize, SeekOrigin.Current);
}
mpqFixedPositionFile.AddToArchive(this, fileIndex, out var mpqEntry, out var mpqHash);
var hashTableEntries = _hashTable.Add(mpqHash, mpqFixedPositionFile.HashIndex, mpqFixedPositionFile.HashCollisions);
for (var i = 0; i < hashTableEntries; i++)
{
_blockTable.Add(mpqEntry);
}
mpqFixedPositionFile.Dispose();
fileIndex += hashTableEntries;
endOfStream = _baseStream.Position;
}
}
mpqFiles.RemoveAll(mpqFile => mpqFile.IsFilePositionFixed);
foreach (var mpqFile in mpqFiles)
{
// TODO: insert files into the gaps
// need to know compressed size of file first, and if file is also encrypted with blockoffsetadjustedkey, encryption needs to happen after gap selection
// therefore, can't use current AddToArchive method, which does both compression and encryption at same time
// var availableGaps = gaps.Where(gap => gap.Length >= )
var selectedPosition = endOfStream;
var selectedGap = false;
_baseStream.Position = selectedPosition;
mpqFile.AddToArchive(this, fileIndex, out var mpqEntry, out var mpqHash);
var hashTableEntries = _hashTable.Add(mpqHash, mpqFile.HashIndex, mpqFile.HashCollisions);
for (var i = 0; i < hashTableEntries; i++)
{
_blockTable.Add(mpqEntry);
}
mpqFile.Dispose();
fileIndex += hashTableEntries;
if (!selectedGap)
{
endOfStream = _baseStream.Position;
}
}
_baseStream.Position = endOfStream;
_hashTable.WriteTo(writer);
_blockTable.WriteTo(writer);
/*if (!_archiveFollowsHeader)
* {
* foreach (var mpqFile in mpqFiles)
* {
* mpqFile.WriteTo(writer, true);
* }
* }*/
writer.Seek((int)_headerOffset, SeekOrigin.Begin);
_mpqHeader = new MpqHeader((uint)(endOfStream - fileOffset), _hashTable.Size, _blockTable.Size, blockSize, _archiveFollowsHeader);
_mpqHeader.WriteTo(writer);
}
}
/// <summary>
/// Repairs corrupted values in an <see cref="MpqArchive"/>.
/// </summary>
/// <param name="sourceStream">The stream containing the archive that needs to be repaired.</param>
/// <param name="leaveOpen">If false, the given <paramref name="sourceStream"/> will be disposed at the end of this method.</param>
/// <returns>A stream containing the repaired archive.</returns>
public static MemoryStream Restore(Stream sourceStream, bool leaveOpen = false)
{
if (sourceStream is null)
{
throw new ArgumentNullException(nameof(sourceStream));
}
if (!TryLocateMpqHeader(sourceStream, out var mpqHeader, out var headerOffset))
{
throw new MpqParserException($"Unable to locate MPQ header.");
}
if (mpqHeader.MpqVersion != 0)
{
throw new MpqParserException($"MPQ format version {mpqHeader.MpqVersion} is not supported");
}
var memoryStream = new MemoryStream();
using (var writer = new BinaryWriter(memoryStream, new UTF8Encoding(false, true), true))
{
// Skip the MPQ header, since its contents will be calculated afterwards.
writer.Seek((int)MpqHeader.Size, SeekOrigin.Current);
var archiveSize = 0U;
var hashTableEntries = mpqHeader.HashTableSize;
var blockTableEntries = mpqHeader.BlockTableSize > MpqTable.MaxSize
? mpqHeader.IsArchiveAfterHeader()
? mpqHeader.BlockTablePosition < mpqHeader.HeaderOffset
? (mpqHeader.HeaderOffset - mpqHeader.BlockTablePosition) / MpqEntry.Size
: (uint)(sourceStream.Length - sourceStream.Position) / MpqEntry.Size
: throw new MpqParserException($"Unable to determine true BlockTable size.")
: mpqHeader.BlockTableSize;
var hashTable = (HashTable?)null;
var blockTable = (BlockTable?)null;
using (var reader = new BinaryReader(sourceStream, new UTF8Encoding(), true))
{
// Load hash table
sourceStream.Seek(mpqHeader.HashTablePosition, SeekOrigin.Begin);
hashTable = new HashTable(reader, hashTableEntries);
// Load entry table
sourceStream.Seek(mpqHeader.BlockTablePosition, SeekOrigin.Begin);
blockTable = new BlockTable(reader, blockTableEntries, (uint)headerOffset);
// Load archive files
for (var i = 0; i < blockTable.Size; i++)
{
var entry = blockTable[i];
if ((entry.Flags & MpqFileFlags.Garbage) == 0)
{
var size = entry.CompressedSize;
var flags = entry.Flags;
if (entry.IsEncrypted && entry.Flags.HasFlag(MpqFileFlags.BlockOffsetAdjustedKey))
{
// To prevent encryption seed becoming incorrect, save file uncompressed and unencrypted.
var pos = sourceStream.Position;
using (var mpqStream = new MpqStream(entry, sourceStream, BlockSizeModifier << mpqHeader.BlockSize))
{
mpqStream.CopyTo(memoryStream);
}
sourceStream.Position = pos + size;
size = entry.FileSize;
flags = entry.Flags & ~(MpqFileFlags.Compressed | MpqFileFlags.Encrypted | MpqFileFlags.BlockOffsetAdjustedKey);
}
else
{
sourceStream.Position = entry.FilePosition;
writer.Write(reader.ReadBytes((int)size));
}
blockTable[i] = new MpqEntry(null, 0, MpqHeader.Size + archiveSize, size, entry.FileSize, flags);
archiveSize += size;
}
else
{
blockTable[i] = new MpqEntry(null, 0, MpqHeader.Size + archiveSize, 0, 0, 0);
}
}
}
// Fix invalid block indices and locales.
for (var i = 0; i < hashTable.Size; i++)
{
var hash = hashTable[i];
if (!hash.IsEmpty && !hash.IsDeleted && hash.BlockIndex > BlockTable.MaxSize)
{
// TODO: don't force neutral locale if another MpqHash exists with the same Name1 and Name2, and that has the neutral locale
hashTable[i] = new MpqHash(hash.Name, MpqLocale.Neutral /*hash.Locale & (MpqLocale)0x00000FFF*/, hash.BlockIndex & (BlockTable.MaxSize - 1), hash.Mask);
}
}
hashTable.SerializeTo(memoryStream);
blockTable.SerializeTo(memoryStream);
writer.Seek(0, SeekOrigin.Begin);
new MpqHeader(archiveSize, hashTableEntries, blockTableEntries, mpqHeader.BlockSize).WriteTo(writer);
}
if (!leaveOpen)
{
sourceStream.Dispose();
}
memoryStream.Position = 0;
return(memoryStream);
}
/// <summary>
/// Initializes a new instance of the <see cref="MpqArchive"/> class.
/// </summary>
/// <param name="sourceStream">The <see cref="Stream"/> containing pre-archive data. Can be null.</param>
/// <param name="mpqFiles">The <see cref="MpqFile"/>s that should be added to the archive.</param>
/// <param name="hashTableSize">The desired size of the <see cref="BlockTable"/>. Larger size decreases the likelihood of hash collisions.</param>
/// <param name="blockSize">The size of blocks in compressed files, which is used to enable seeking.</param>
/// <exception cref="ArgumentNullException">Thrown when the <paramref name="mpqFiles"/> collection is null.</exception>
public MpqArchive(Stream sourceStream, ICollection <MpqFile> mpqFiles, ushort?hashTableSize = null, ushort blockSize = 8)
{
// TODO: copy sourceStream contents to a new stream if CanWrite property is false (can do this in alignStream method)
_baseStream = AlignStream(sourceStream ?? new MemoryStream());
_headerOffset = _baseStream.Position;
_blockSize = BlockSizeModifier << blockSize;
var fileCount = (uint)(mpqFiles ?? throw new ArgumentNullException(nameof(mpqFiles))).Count;
_hashTable = new HashTable(Math.Max(hashTableSize ?? fileCount * 8, fileCount));
_blockTable = new BlockTable(fileCount);
using (var writer = new BinaryWriter(_baseStream, new UTF8Encoding(false, true), true))
{
// Skip the MPQ header, since its contents will be calculated afterwards.
writer.Seek((int)MpqHeader.Size, SeekOrigin.Current);
const bool archiveBeforeTables = true;
uint hashTableEntries = 0;
// Write Archive
var fileIndex = 0U;
var fileOffset = archiveBeforeTables ? MpqHeader.Size : throw new NotImplementedException();
var filePos = fileOffset;
// TODO: add support for encryption of the archive files
foreach (var mpqFile in mpqFiles)
{
var locale = MpqLocale.Neutral;
mpqFile.AddToArchive((uint)_headerOffset, fileIndex, filePos, locale, _hashTable.Mask);
if (archiveBeforeTables)
{
mpqFile.SerializeTo(writer, true);
}
hashTableEntries += _hashTable.Add(mpqFile.MpqHash, mpqFile.HashIndex, mpqFile.HashCollisions);
_blockTable.Add(mpqFile.MpqEntry);
filePos += mpqFile.MpqEntry.CompressedSize;
fileIndex++;
}
// Match size of blocktable with amount of occupied entries in hashtable
/*
* for ( var i = blockTable.Size; i < hashTableEntries; i++ )
* {
* var entry = MpqEntry.Dummy;
* entry.SetPos( filePos );
* blockTable.Add( entry );
* }
* blockTable.UpdateSize();
*/
_hashTable.SerializeTo(writer);
_blockTable.SerializeTo(writer);
if (!archiveBeforeTables)
{
foreach (var mpqFile in mpqFiles)
{
mpqFile.SerializeTo(writer, true);
}
}
writer.Seek((int)_headerOffset, SeekOrigin.Begin);
_mpqHeader = new MpqHeader(filePos - fileOffset, _hashTable.Size, _blockTable.Size, blockSize, archiveBeforeTables);
_mpqHeader.WriteToStream(writer);
}
}
/// <summary>
/// Initializes a new instance of the <see cref="MpqArchive"/> class.
/// </summary>
/// <param name="sourceStream">The <see cref="Stream"/> containing pre-archive data. Can be <see langword="null"/>.</param>
/// <param name="inputFiles">The <see cref="MpqFile"/>s that should be added to the archive.</param>
/// <param name="createOptions"></param>
/// <param name="leaveOpen">If <see langword="false"/>, the given <paramref name="sourceStream"/> will be disposed when the <see cref="MpqArchive"/> is disposed.</param>
/// <exception cref="ArgumentNullException">Thrown when the <paramref name="mpqFiles"/> collection is <see langword="null"/>.</exception>
public MpqArchive(Stream?sourceStream, IEnumerable <MpqFile> inputFiles, MpqArchiveCreateOptions createOptions, bool leaveOpen = false)
{
if (inputFiles is null)
{
throw new ArgumentNullException(nameof(inputFiles));
}
if (createOptions is null)
{
throw new ArgumentNullException(nameof(createOptions));
}
_isStreamOwner = !leaveOpen;
_baseStream = AlignStream(sourceStream);
_headerOffset = _baseStream.Position;
_blockSize = BlockSizeModifier << createOptions.BlockSize;
_archiveFollowsHeader = createOptions.WriteArchiveFirst;
var signatureName = Signature.FileName.GetStringHash();
var listFileName = ListFile.FileName.GetStringHash();
var attributesName = Attributes.FileName.GetStringHash();
var signatureCreateMode = createOptions.SignatureCreateMode.GetValueOrDefault(MpqFileCreateMode.Prune);
var listFileCreateMode = createOptions.ListFileCreateMode.GetValueOrDefault(MpqFileCreateMode.Overwrite);
var attributesCreateMode = createOptions.AttributesCreateMode.GetValueOrDefault(MpqFileCreateMode.Overwrite);
var haveSignature = false;
var haveListFile = false;
var haveAttributes = false;
var mpqFiles = new HashSet <MpqFile>(MpqFileComparer.Default);
foreach (var mpqFile in inputFiles)
{
if (mpqFile is MpqOrphanedFile)
{
continue;
}
if (mpqFile.Name == signatureName)
{
if (signatureCreateMode.HasFlag(MpqFileCreateMode.RemoveFlag))
{
continue;
}
else
{
haveSignature = true;
}
}
if (mpqFile.Name == listFileName)
{
if (listFileCreateMode.HasFlag(MpqFileCreateMode.RemoveFlag))
{
continue;
}
else
{
haveListFile = true;
}
}
if (mpqFile.Name == attributesName)
{
if (attributesCreateMode.HasFlag(MpqFileCreateMode.RemoveFlag))
{
continue;
}
else
{
haveAttributes = true;
}
}
if (!mpqFiles.Add(mpqFile))
{
// todo: logging?
}
}
var fileCount = (uint)mpqFiles.Count;
var wantGenerateSignature = !haveSignature && signatureCreateMode.HasFlag(MpqFileCreateMode.AddFlag);
var signature = wantGenerateSignature ? new Signature() : null;
if (wantGenerateSignature)
{
fileCount++;
}
var wantGenerateListFile = !haveListFile && listFileCreateMode.HasFlag(MpqFileCreateMode.AddFlag);
var listFile = wantGenerateListFile ? new ListFile() : null;
if (wantGenerateListFile)
{
fileCount++;
}
var wantGenerateAttributes = !haveAttributes && attributesCreateMode.HasFlag(MpqFileCreateMode.AddFlag);
var attributes = wantGenerateAttributes ? new Attributes(createOptions) : null;
if (wantGenerateAttributes)
{
fileCount++;
}
_hashTable = new HashTable(Math.Max(createOptions.HashTableSize ?? fileCount * 8, fileCount));
_blockTable = new BlockTable();
using (var writer = new BinaryWriter(_baseStream, new UTF8Encoding(false, true), true))
{
// Skip the MPQ header, since its contents will be calculated afterwards.
writer.Seek((int)MpqHeader.Size, SeekOrigin.Current);
// Write Archive
var fileIndex = 0U;
var fileOffset = _archiveFollowsHeader ? MpqHeader.Size : throw new NotImplementedException();
// var gaps = new List<(long Start, long Length)>();
var endOfStream = _baseStream.Position;
void InsertMpqFile(MpqFile mpqFile, bool updateEndOfStream, bool allowMultiple = true)
{
if (listFile is not null && mpqFile is MpqKnownFile knownFile)
{
listFile.FileNames.Add(knownFile.FileName);
}
mpqFile.AddToArchive(this, fileIndex, out var mpqEntry, out var mpqHash);
var hashTableEntries = _hashTable.Add(mpqHash, mpqFile.HashIndex, mpqFile.HashCollisions);
if (!allowMultiple && hashTableEntries > 1)
{
throw new Exception();
}
var crc32 = 0;
if (attributes is not null && attributes.Flags.HasFlag(AttributesFlags.Crc32) && allowMultiple)
{
mpqFile.MpqStream.Position = 0;
crc32 = new Ionic.Crc.CRC32().GetCrc32(mpqFile.MpqStream);
}
for (var i = 0; i < hashTableEntries; i++)
{
_blockTable.Add(mpqEntry);
if (attributes is not null)
{
if (attributes.Flags.HasFlag(AttributesFlags.Crc32))
{
attributes.Crc32s.Add(crc32);
}
if (attributes.Flags.HasFlag(AttributesFlags.DateTime))
{
attributes.DateTimes.Add(DateTime.Now);
}
if (attributes.Flags.HasFlag(AttributesFlags.Unk0x04))
{
attributes.Unk0x04s.Add(new byte[16]);
}
}
}
mpqFile.Dispose();
fileIndex += hashTableEntries;
if (updateEndOfStream)
{
endOfStream = _baseStream.Position;
}
}
// Find files that cannot be decrypted, and need to have a specific position in the archive, because that position is used to calculate the encryption seed.
var mpqFixedPositionFiles = mpqFiles.Where(mpqFile => mpqFile.IsFilePositionFixed).OrderBy(mpqFile => mpqFile.MpqStream.FilePosition).ToArray();
if (mpqFixedPositionFiles.Length > 0)
{
if (mpqFixedPositionFiles.First() !.MpqStream.FilePosition < 0)
{
throw new NotSupportedException($"Cannot place files in front of the header.");
}
foreach (var mpqFixedPositionFile in mpqFixedPositionFiles)
{
var position = mpqFixedPositionFile.MpqStream.FilePosition;
if (position < endOfStream)
{
throw new ArgumentException($"Fixed position files overlap with each other and/or the header. Archive cannot be created.", nameof(inputFiles));
}
if (position > endOfStream)
{
var gapSize = position - endOfStream;
// gaps.Add((endOfStream, gapSize));
writer.Seek((int)gapSize, SeekOrigin.Current);
}
InsertMpqFile(mpqFixedPositionFile, true);
}
}
foreach (var mpqFile in mpqFiles.Where(mpqFile => !mpqFile.IsFilePositionFixed))
{
// TODO: insert files into the gaps
// need to know compressed size of file first, and if file is also encrypted with blockoffsetadjustedkey, encryption needs to happen after gap selection
// therefore, can't use current AddToArchive method, which does both compression and encryption at same time
// var availableGaps = gaps.Where(gap => gap.Length >= )
var selectedPosition = endOfStream;
var selectedGap = false;
_baseStream.Position = selectedPosition;
InsertMpqFile(mpqFile, !selectedGap);
}
var signaturePosition = endOfStream + 8;
if (signature is not null)
{
_baseStream.Position = endOfStream;
using var signatureStream = new MemoryStream();
using var signatureWriter = new BinaryWriter(signatureStream);
signatureWriter.Write(signature);
signatureWriter.Flush();
using var signatureMpqFile = MpqFile.New(signatureStream, Signature.FileName);
signatureMpqFile.TargetFlags = MpqFileFlags.Exists;
InsertMpqFile(signatureMpqFile, true);
}
if (listFile is not null)
{
_baseStream.Position = endOfStream;
using var listFileStream = new MemoryStream();
using var listFileWriter = new StreamWriter(listFileStream);
listFileWriter.WriteListFile(listFile);
listFileWriter.Flush();
using var listFileMpqFile = MpqFile.New(listFileStream, ListFile.FileName);
listFileMpqFile.TargetFlags = MpqFileFlags.Exists | MpqFileFlags.CompressedMulti | MpqFileFlags.Encrypted | MpqFileFlags.BlockOffsetAdjustedKey;
InsertMpqFile(listFileMpqFile, true);
}
if (attributes is not null)
{
_baseStream.Position = endOfStream;
if (attributes.Flags.HasFlag(AttributesFlags.Crc32))
{
attributes.Crc32s.Add(0);
}
if (attributes.Flags.HasFlag(AttributesFlags.DateTime))
{
attributes.DateTimes.Add(DateTime.Now);
}
if (attributes.Flags.HasFlag(AttributesFlags.Unk0x04))
{
attributes.Unk0x04s.Add(new byte[16]);
}
using var attributesStream = new MemoryStream();
using var attributesWriter = new BinaryWriter(attributesStream);
attributesWriter.Write(attributes);
attributesWriter.Flush();
using var attributesMpqFile = MpqFile.New(attributesStream, Attributes.FileName);
attributesMpqFile.TargetFlags = MpqFileFlags.Exists | MpqFileFlags.CompressedMulti | MpqFileFlags.Encrypted | MpqFileFlags.BlockOffsetAdjustedKey;
InsertMpqFile(attributesMpqFile, true, false);
}
_baseStream.Position = endOfStream;
_hashTable.WriteTo(writer);
_blockTable.WriteTo(writer);
/*if (!_archiveFollowsHeader)
* {
* foreach (var mpqFile in mpqFiles)
* {
* mpqFile.WriteTo(writer, true);
* }
* }*/
writer.Seek((int)_headerOffset, SeekOrigin.Begin);
_mpqHeader = new MpqHeader((uint)_headerOffset, (uint)(endOfStream - fileOffset), _hashTable.Size, _blockTable.Size, createOptions.BlockSize, _archiveFollowsHeader);
_mpqHeader.WriteTo(writer);
if (wantGenerateSignature)
{
var archiveBytes = new byte[_mpqHeader.ArchiveSize];
_baseStream.Position = _headerOffset;
_baseStream.Read(archiveBytes);
using var rsa = RSA.Create();
rsa.ImportFromPem(createOptions.SignaturePrivateKey);
var signatureBytes = rsa.SignData(archiveBytes, HashAlgorithmName.MD5, RSASignaturePadding.Pkcs1);
_baseStream.Position = signaturePosition;
_baseStream.Write(signatureBytes.Reverse().ToArray());
}
}
}