/// <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>
/// 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());
}
}
}