| public static GetString ( string name ) : string | ||
| name | string | |
| return | string | |
private static unsafe PatchInfoHeader ReadPatchInfoHeader(MpqArchive archive, long offset)
{
// Always get a buffer big enough, even if the extra bytes are not present…
// As of now (09/2011), the header should always be 28 bytes long, but this may change in the future…
var sharedBuffer = CommonMethods.GetSharedBuffer(sizeof(PatchInfoHeader));
// No buffer should ever be smaller than 28 bytes… right ?
if (archive.ReadArchiveData(sharedBuffer, 0, offset, 28) != 28)
{
throw new EndOfStreamException(ErrorMessages.GetString("PatchInfoHeaderEndOfStream")); // It's weird if we could not read the whole 28 bytes… (At worse, we should have read trash data)
}
var patchInfoHeader = new PatchInfoHeader();
patchInfoHeader.HeaderLength = (uint)sharedBuffer[0] | (uint)sharedBuffer[1] << 8 | (uint)sharedBuffer[2] << 16 | (uint)sharedBuffer[3] << 24;
patchInfoHeader.Flags = (uint)sharedBuffer[4] | (uint)sharedBuffer[5] << 8 | (uint)sharedBuffer[6] << 16 | (uint)sharedBuffer[7] << 24;
patchInfoHeader.PatchLength = (uint)sharedBuffer[8] | (uint)sharedBuffer[9] << 8 | (uint)sharedBuffer[10] << 16 | (uint)sharedBuffer[11] << 24;
// Let's assume the MD5 is not mandatory…
if (patchInfoHeader.HeaderLength >= 28)
{
for (int i = 0; i < 16; i++)
{
patchInfoHeader.PatchMD5[i] = sharedBuffer[12 + i];
}
}
return(patchInfoHeader);
}
/// <summary>Opens the file for reading.</summary>
/// <returns>Returns a Stream object which can be used to read data in the file.</returns>
/// <remarks>Files can only be opened once, so don't forget to close the stream after you've used it.</remarks>
public MpqFileStream Open()
{
if (IsDeleted)
{
throw new InvalidOperationException(ErrorMessages.GetString("MpqFileDeleted"));
}
return(new MpqFileStream(this));
}
private MpqCompressionNotSupportedException(string errorMessageName, byte methodId, string methodName)
: base(string.Format(ErrorMessages.GetString(errorMessageName), methodId))
{
CompressionMethodId = methodId;
CompressionMethodName = methodName;
}
internal MpqCompressionNotSupportedException(byte methodId, string methodName)
: base(string.Format(ErrorMessages.GetString("CompressionNotSupported_Name"), methodName))
{
}
internal MpqFileStream(MpqFile file, Stream baseStream = null)
{
try
{
PatchInfoHeader?patchInfoHeader; // Used to differentiate between regulat files and patch files. Also contains the patch header :p
// Store bits of information as local variables, in order to adjust them later.
bool singleUnit = (file.Flags & MpqFileFlags.SingleBlock) != 0;
bool compressed = file.IsCompressed;
uint compressedSize = (uint)file.CompressedSize;
this.file = file;
this.offset = file.Offset;
// Process the patch information header first
if (file.IsPatch)
{
// Resolving the base file this early may be a waste if the patch ever happens to be a COPY patch… Anyway, it allows for checking the base file's integrity.
// But seriously, what's the point in COPY patches anyway ? Aren't those just like regular MPQ files, only with added (useless) weight ?
if ((baseStream = baseStream ?? file.Archive.ResolveBaseFileInternal(file)) == null)
{
throw new FileNotFoundException(string.Format(ErrorMessages.GetString("PatchBaseFileNotFound"), file.Name));
}
patchInfoHeader = ReadPatchInfoHeader(file.Archive, file.Offset);
offset += patchInfoHeader.Value.HeaderLength;
length = patchInfoHeader.Value.PatchLength; // No matter what crap may be written in the block table, it seems that this field is always right (I had to update the decompression method just for that…)
if (patchInfoHeader.Value.PatchLength <= file.CompressedSize)
{
// As it seems, there are some bogus entries in the block table of mpq patch archives. (Only for patch files though)
// If you browse the list of DBC files, i'd say there are about 10% of them which have a bogus block table entry.
// So, for detecting them, we'll use the same method as in stormlib. We'll try to read the patch header to know is the patch is compressed or not.
// By the way, we cannot detect whether the patch is compressed or not if it is encrypted.
if (file.IsEncrypted)
{
throw new InvalidDataException(ErrorMessages.GetString("PatchInfoHeaderInvalidData"));
}
// Try to read the patch header in the data following the information header and adjust the compressed size dependign on the result:
// Since we are “sure” of the uncompressed size (given in the patch header), there is no point in compression if the compressed data isn't even one byte less.
// Thus, we can mostly safely decrease the compressed size by 1, which, by the way, is necessary to make decompression work in UpdateBuffer()…
compressedSize = patchInfoHeader.Value.PatchLength - ((compressed = !TestPatchHeader(file.Archive, offset)) ? (uint)1 : 0);
// It appears that the single unit flag is also lying on some patch entries. Files reported as blocky (such as some of the cataclysm mp3) are in fact single unit…
// Forcing this single unit flag to true when the file is compressed seems to be a good solution. Also, we may (or not :p) save a bit of memory by using blocks for uncompressed files.
singleUnit = compressed;
}
}
else
{
patchInfoHeader = null;
length = checked ((uint)file.Size);
}
// Set up the stream the same way for both patches and regular files…
if (file.IsEncrypted)
{
if (file.Seed == 0)
{
throw new SeedNotFoundException(file.BlockIndex);
}
else
{
this.seed = file.Seed;
}
if ((file.Flags & MpqFileFlags.PositionEncrypted) != 0)
{
this.seed = (this.seed + (uint)file.Offset) ^ (uint)this.length;
}
}
if (singleUnit)
{
this.fileHeader = new uint[] { 0, compressedSize }
}
;
else if (compressed)
{
this.fileHeader = ReadBlockOffsets(file.Archive, this.seed, this.offset, (int)((length + file.Archive.BlockSize - 1) / file.Archive.BlockSize + 1));
}
else
{
this.fileHeader = new uint[(int)(length + file.Archive.BlockSize - 1) / file.Archive.BlockSize + 1];
this.fileHeader[0] = 0;
for (int i = 1; i < this.fileHeader.Length; i++)
{
this.fileHeader[i] = this.fileHeader[i - 1] + (uint)file.Archive.BlockSize;
if (this.fileHeader[i] > length)
{
this.fileHeader[i] = (uint)this.length;
}
}
}
// Treat the files smaller than the block size as single unit. (But only now that we've read the file header)
singleUnit |= length <= file.Archive.BlockSize;
this.blockBuffer = new byte[singleUnit ? length : (uint)file.Archive.BlockSize];
if (compressed)
{
this.compressedBuffer = new byte[singleUnit ? compressedSize : (uint)file.Archive.BlockSize];
}
this.lastBlockLength = this.length > 0 ? this.length % (uint)this.blockBuffer.Length : 0;
if (this.lastBlockLength == 0)
{
this.lastBlockLength = (uint)this.blockBuffer.Length;
}
this.currentBlock = -1;
UpdateBuffer();
// If we finished initializing a stream to patch data, all there is left is to apply the patch
if (patchInfoHeader != null)
{
// The patching methods will read from this stream instance (whose constructor has yet to finish… !) and return the patched data.
this.blockBuffer = ApplyPatch(patchInfoHeader.Value, baseStream);
// Once the patch has been applied, transform this stream into a mere memory stream. (The same as with single unit files, in fact)
this.compressedBuffer = null;
this.fileHeader = new uint[] { 0, (uint)this.blockBuffer.Length };
this.position = 0;
this.currentBlock = 0;
this.readBufferOffset = 0;
this.length = (uint)this.blockBuffer.Length;
}
}
finally { if (baseStream != null)
{
baseStream.Dispose();
}
}
}
private unsafe byte[] ApplyBsd0Patch(ref PatchInfoHeader patchInfoHeader, ref PatchHeader patchHeader, uint patchLength, byte[] originalData)
{
byte[] patchData;
if (patchLength < patchHeader.PatchLength)
{
patchData = UnpackRle();
}
else
{
patchData = new byte[patchLength];
if (Read(patchData, 0, checked ((int)patchLength)) != patchLength)
{
throw new EndOfStreamException();
}
}
fixed(byte *patchDataPointer = patchData)
{
var bsdiffHeader = (PatchBsdiff40Header *)patchDataPointer;
if (!BitConverter.IsLittleEndian)
{
CommonMethods.SwapBytes((ulong *)patchDataPointer, sizeof(PatchBsdiff40Header) >> 3);
}
if (bsdiffHeader->Signature != 0x3034464649445342 /* 'BSDIFF40' */)
{
throw new InvalidDataException(ErrorMessages.GetString("Bsd0PatchHeaderInvalidSignature"));
}
var controlBlock = (uint *)(patchDataPointer + sizeof(PatchBsdiff40Header));
var differenceBlock = (byte *)controlBlock + bsdiffHeader->ControlBlockLength;
var extraBlock = differenceBlock + bsdiffHeader->DifferenceBlockLength;
if (!BitConverter.IsLittleEndian)
{
CommonMethods.SwapBytes(controlBlock, bsdiffHeader->ControlBlockLength >> 2);
}
var patchBuffer = new byte[bsdiffHeader->PatchedFileSize];
fixed(byte *originalDataPointer = originalData)
fixed(byte *patchBufferPointer = patchBuffer)
{
var sourcePointer = originalDataPointer;
var destinationPointer = patchBufferPointer;
int sourceCount = originalData.Length;
int destinationCount = patchBuffer.Length;
while (destinationCount != 0)
{
uint differenceLength = *controlBlock++;
uint extraLength = *controlBlock++;
uint sourceOffset = *controlBlock++;
if (differenceLength > destinationCount)
{
throw new InvalidDataException(ErrorMessages.GetString("Bsd0PatchInvalidData"));
}
destinationCount = (int)(destinationCount - differenceLength);
// Apply the difference patch (Patched Data = Original data + Difference data)
for (; differenceLength-- != 0; destinationPointer++, sourcePointer++)
{
*destinationPointer = *differenceBlock++;
if (sourceCount > 0)
{
*destinationPointer += *sourcePointer;
}
}
if (extraLength > destinationCount)
{
throw new InvalidDataException(ErrorMessages.GetString("Bsd0PatchInvalidData"));
}
destinationCount = (int)(destinationCount - extraLength);
// Apply the extra data patch (New data)
for (; extraLength-- != 0;)
{
*destinationPointer++ = *extraBlock++;
}
sourcePointer += (sourceOffset & 0x80000000) != 0 ? unchecked ((int)(0x80000000 - sourceOffset)) : (int)sourceOffset;
}
}
return(patchBuffer);
}
}
private unsafe byte[] ApplyPatch(PatchInfoHeader patchInfoHeader, Stream baseStream)
{
PatchHeader patchHeader;
Read((byte *)&patchHeader, sizeof(PatchHeader));
if (!BitConverter.IsLittleEndian)
{
CommonMethods.SwapBytes((uint *)&patchHeader, sizeof(PatchHeader) >> 2);
}
if (patchHeader.Signature != 0x48435450 /* 'PTCH' */)
{
throw new InvalidDataException(ErrorMessages.GetString("PatchHeaderInvalidSignature"));
}
if (patchHeader.PatchedFileSize != file.Size)
{
throw new InvalidDataException(ErrorMessages.GetString("PatchHeaderInvalidFileSize"));
}
if (baseStream.Length != patchHeader.OriginalFileSize)
{
throw new InvalidDataException(ErrorMessages.GetString("PatchHeaderInvalidBaseFileSize"));
}
// Once the initial tests are passed, we can load the whole patch in memory.
// This will take a big amount of memory, but will avoid having to unpack the file twice…
var originalData = new byte[baseStream.Length];
if (baseStream.Read(originalData, 0, originalData.Length) != originalData.Length)
{
throw new EndOfStreamException();
}
var md5 = CommonMethods.SharedMD5;
var originalHash = md5.ComputeHash(originalData);
PatchMD5ChunkData md5ChunkData;
bool hasMD5 = false;
while (true)
{
long chunkPosition = Position;
var chunkHeader = stackalloc uint[2];
if (Read((byte *)chunkHeader, 8) != 8)
{
throw new EndOfStreamException();
}
if (!BitConverter.IsLittleEndian)
{
CommonMethods.SwapBytes(chunkHeader, 2);
}
if (chunkHeader[0] == 0x5F35444D /* 'MD5_' */)
{
if (Read((byte *)&md5ChunkData, sizeof(PatchMD5ChunkData)) != sizeof(PatchMD5ChunkData))
{
throw new EndOfStreamException();
}
if (!CommonMethods.CompareData(originalHash, md5ChunkData.OrginialFileMD5))
{
throw new InvalidDataException(ErrorMessages.GetString("PatchBaseFileMD5Failed"));
}
hasMD5 = true;
}
else if (chunkHeader[0] == 0x4D524658 /* 'XFRM' */)
{
// This may not be a real problem, however, let's not handle this case for now… (May fail because of the stupid bogus patches…)
if (chunkPosition + chunkHeader[1] != Length)
{
throw new InvalidDataException(ErrorMessages.GetString("PatchXfrmChunkError"));
}
uint patchType;
if (Read((byte *)&patchType, 4) != 4)
{
throw new EndOfStreamException();
}
if (!BitConverter.IsLittleEndian)
{
patchType = CommonMethods.SwapBytes(patchType);
}
uint patchLength = chunkHeader[1] - 12;
byte[] patchedData;
if (patchType == 0x59504F43 /* 'COPY' */)
{
patchedData = ApplyCopyPatch(ref patchInfoHeader, ref patchHeader, patchLength, originalData);
}
if (patchType == 0x30445342 /* 'BSD0' */)
{
patchedData = ApplyBsd0Patch(ref patchInfoHeader, ref patchHeader, patchLength, originalData);
}
else
{
throw new NotSupportedException("Unsupported patch type: '" + CommonMethods.FourCCToString(chunkHeader[0]) + "'");
}
if (hasMD5)
{
var patchedHash = md5.ComputeHash(patchedData);
if (!CommonMethods.CompareData(patchedHash, md5ChunkData.PatchedFileMD5))
{
throw new InvalidDataException("PatchFinalFileMD5Failed");
}
}
return(patchedData);
}
else
{
throw new InvalidDataException(string.Format(ErrorMessages.GetString("PatchUnknownChunk"), CommonMethods.FourCCToString(chunkHeader[0])));
}
Seek(chunkPosition + chunkHeader[1], SeekOrigin.Begin);
}
}
private void OpenInternal(Stream stream, bool shouldParseListFile)
{
// MPQ offsets can be 32 bits, 48 bits or 64 bits depending on the MPQ version used…
long hashTableOffset, hashTableCompressedSize, hashTableSize;
long blockTableOffset, blockTableCompressedSize, blockTableSize;
long highBlockTableOffset, highBlockTableCompressedSize, highBlockTableSize;
long enhancedHashTableOffset, enhancedHashTableCompressedSize;
long enhancedBlockTableOffset, enhancedBlockTableCompressedSize;
uint hashTableLength, blockTableLength;
uint rawChunkSize;
uint signature;
byte[] hashes;
if (!stream.CanSeek)
{
throw new InvalidOperationException(ErrorMessages.GetString("SeekableStreamRequired"));
}
if (checked (stream.Position + stream.Length) < 0x20)
{
throw new InvalidDataException(ErrorMessages.GetString("NotEnoughData"));
}
// We use a lot of "long" and "int" variables here, but data is likely stored as ulong and uint…
// So better test for overflow… Who knows what might happen in the future… ;)
// The "safe" pattern is to read as unsigned and cast to signed where oferflow is possible.
checked
{
this.stream = stream;
archiveDataOffset = stream.Position; // We don't handle searching for MPQ data. The stream must already be positionned at the beginning of the MPQ data.
signature = stream.ReadUInt32();
// The first part of the file may be MPQ user data. The next part should be regular MPQ archive data.
if (signature == MpqUserDataSignature)
{
userDataOffset = archiveDataOffset;
userDataLength = stream.ReadUInt32();
stream.Seek(stream.ReadUInt32() - 3 * sizeof(uint), SeekOrigin.Current);
archiveDataOffset = stream.Position;
signature = stream.ReadUInt32();
}
// Checking for MPQ archive signature
if (signature != MpqArchiveSignature)
{
throw new InvalidDataException(ErrorMessages.GetString("InvalidData"));
}
headerSize = stream.ReadUInt32();
archiveDataLength = stream.ReadUInt32();
// MPQ format detection
// Unknown MPQ version will raise an error… This seems like a safe idea.
ushort mpqVersion = stream.ReadUInt16();
switch (mpqVersion) // Read MPQ format
{
case 0: // Original MPQ format
archiveFormat = MpqFormat.Original;
if (headerSize < 0x20)
{
throw new InvalidDataException(ErrorMessages.GetString("InvalidArchiveHeader"));
}
break;
case 1: // Extended MPQ format (WoW Burning Crusade)
archiveFormat = MpqFormat.BurningCrusade;
if (headerSize < 0x2C)
{
throw new InvalidDataException(ErrorMessages.GetString("InvalidArchiveHeader"));
}
break;
case 2: // Enhanced MPQ format (Take 1)
archiveFormat = MpqFormat.CataclysmFirst;
// Header may not contain any additional field than BC extended MPQ format.
// However, if additional fields are present, the header should be at least 68 bytes long.
if (headerSize < 0x2C || (headerSize > 0x2C && headerSize < 0x44))
{
throw new InvalidDataException(ErrorMessages.GetString("InvalidArchiveHeader"));
}
break;
case 3: // Enhanced MPQ format (Take 2)
archiveFormat = MpqFormat.CataclysmSecond;
if (headerSize < 0xD0)
{
throw new InvalidDataException(ErrorMessages.GetString("InvalidArchiveHeader"));
}
break;
default:
throw new MpqVersionNotSupportedException(mpqVersion); // Newer MPQ versions can probably be read just as well by the existing code… But can't know for sure…
}
blockSize = 0x200 << stream.ReadUInt16(); // Calculate block size
hashTableOffset = stream.ReadUInt32(); // Get Hash Table Offset
blockTableOffset = stream.ReadUInt32(); // Get Block Table Offset
hashTableLength = stream.ReadUInt32(); // Get Hash Table Size
blockTableLength = stream.ReadUInt32(); // Get Block Table Size
// Assign the compressed size for the various tables.
// Since compression was non-existant with V1 & V2, we know the compressed size is the uncompressed size.
// If the compressed size is different as specified in V4, this will be overwritten later.
hashTableCompressedSize = 4 * sizeof(uint) * hashTableLength;
if (blockTableOffset > hashTableOffset && blockTableOffset - hashTableOffset < hashTableCompressedSize) // Compute compressed hash table length if needed
{
hashTableCompressedSize = blockTableOffset - hashTableOffset;
}
blockTableCompressedSize = 4 * sizeof(uint) * blockTableLength;
// Process additional values for "Burning Crusade" MPQ format
if (archiveFormat >= MpqFormat.BurningCrusade)
{
ushort hashTableOffsetHigh, blockTableOffsetHigh;
// Read extended information
highBlockTableOffset = (long)stream.ReadUInt64();
highBlockTableCompressedSize = highBlockTableOffset != 0 ? sizeof(uint) * blockTableLength : 0;
hashTableOffsetHigh = stream.ReadUInt16();
blockTableOffsetHigh = stream.ReadUInt16();
// Modify offsets accordingly
hashTableOffset |= (long)hashTableOffsetHigh << 32;
blockTableOffset |= (long)blockTableOffsetHigh << 32;
// Handle MPQ version 3 (Cataclysm First) and newer
if (archiveFormat >= MpqFormat.CataclysmFirst && headerSize >= 0x44)
{
archiveDataLength = (long)stream.ReadUInt64();
enhancedBlockTableOffset = (long)stream.ReadUInt64();
enhancedHashTableOffset = (long)stream.ReadUInt64();
// Handle MPQ version 4 (Cataclysm Second)
if (archiveFormat >= MpqFormat.CataclysmSecond)
{
hashTableCompressedSize = (long)stream.ReadUInt64();
blockTableCompressedSize = (long)stream.ReadUInt64();
highBlockTableCompressedSize = (long)stream.ReadUInt64();
enhancedHashTableCompressedSize = (long)stream.ReadUInt64();
enhancedBlockTableCompressedSize = (long)stream.ReadUInt64();
rawChunkSize = stream.ReadUInt32();
hashes = new byte[6 * 16];
if (stream.Read(hashes, 0, hashes.Length) != hashes.Length)
{
throw new EndOfStreamException();
}
}
else
{
// TODO: Compute the uncompresed size for the new enhanced tables of version 3… (Will have to check how to do that…)
highBlockTableCompressedSize = highBlockTableOffset > 0 ? sizeof(ushort) * blockTableLength : 0;
}
}
else
{
#if DEBUG
long oldArchiveSize = archiveDataLength;
#endif
// Compute 64 bit archive size (We don't really need it for MPQ reading, but for integrity checks, we do…)
if (highBlockTableOffset > hashTableOffset && highBlockTableOffset > blockTableOffset)
{
archiveDataLength = highBlockTableOffset + sizeof(ushort) * blockTableLength;
}
else if (blockTableOffset > hashTableOffset)
{
archiveDataLength = blockTableOffset + 4 * sizeof(uint) * blockTableLength;
}
else
{
archiveDataLength = hashTableOffset + 4 * sizeof(uint) * hashTableLength;
}
#if DEBUG
Debug.Assert(oldArchiveSize >= archiveDataLength);
#endif
}
}
else
{
highBlockTableOffset = 0;
highBlockTableCompressedSize = 0;
}
if (!CheckOffset((uint)headerSize) ||
!CheckOffset(hashTableOffset) || !CheckOffset(blockTableOffset) ||
hashTableLength < blockTableLength)
{
throw new InvalidDataException(ErrorMessages.GetString("InvalidArchiveHeader"));
}
hashTableSize = 4 * sizeof(uint) * hashTableLength;
blockTableSize = 4 * sizeof(uint) * blockTableLength;
highBlockTableSize = highBlockTableOffset != 0 ? sizeof(ushort) * blockTableLength : 0;
// Check for strong signature presence
if (stream.Length >= archiveDataOffset + archiveDataLength + 2052)
{
stream.Seek(archiveDataOffset + archiveDataLength, SeekOrigin.Begin);
hasStrongSignature = stream.ReadUInt32() == MpqStrongSignatureSignature;
}
}
// Create buffers for table reading
var tableReadBuffer = hashTableSize < hashTableCompressedSize || blockTableSize < blockTableCompressedSize || highBlockTableCompressedSize < highBlockTableSize ?
new byte[Math.Max(Math.Max(hashTableCompressedSize, blockTableCompressedSize), highBlockTableCompressedSize)] :
null;
var tableBuffer = new byte[Math.Max(hashTableSize, blockTableSize)];
// Read Hash Table
ReadHashTable(tableBuffer, hashTableLength, hashTableOffset, hashTableCompressedSize, tableReadBuffer);
// Read Block Table
ReadBlockTable(tableBuffer, blockTableLength, blockTableOffset, blockTableCompressedSize, highBlockTableOffset, highBlockTableCompressedSize, tableReadBuffer);
// When possible, find and parse the listfile…
listFile = FindFile(ListFileName);
if (listFile == null)
{
return;
}
if (shouldParseListFile)
{
ParseListFile();
}
}
private unsafe byte[] ApplyBsd0Patch(ref PatchInfoHeader patchInfoHeader, ref PatchHeader patchHeader, uint patchLength, byte[] originalData)
{
byte[] patchData;
if (patchLength < patchHeader.PatchLength)
{
patchData = UnpackRle(patchLength);
}
else
{
patchData = new byte[patchLength];
if (Read(patchData, 0, checked ((int)patchLength)) != patchLength)
{
throw new EndOfStreamException();
}
}
fixed(byte *patchDataPointer = patchData)
{
var bsdiffHeader = (PatchBsdiff40Header *)patchDataPointer;
if (!BitConverter.IsLittleEndian)
{
CommonMethods.SwapBytes((ulong *)patchDataPointer, sizeof(PatchBsdiff40Header) / sizeof(ulong));
}
if (bsdiffHeader->Signature != 0x3034464649445342 /* 'BSDIFF40' */)
{
throw new InvalidDataException(ErrorMessages.GetString("Bsd0PatchHeaderInvalidSignature"));
}
var controlBlock = (uint *)(patchDataPointer + sizeof(PatchBsdiff40Header));
var differenceBlock = (byte *)controlBlock + bsdiffHeader->ControlBlockLength;
var extraBlock = differenceBlock + bsdiffHeader->DifferenceBlockLength;
if (!BitConverter.IsLittleEndian)
{
CommonMethods.SwapBytes(controlBlock, bsdiffHeader->ControlBlockLength / sizeof(uint));
}
var patchedBuffer = new byte[bsdiffHeader->PatchedFileSize];
uint o = 0;
uint n = 0;
try
{
while (n < patchedBuffer.Length)
{
uint differenceLength = *controlBlock++;
uint extraLength = *controlBlock++;
uint sourceOffset = *controlBlock++;
// Apply the difference patch (Patched Data = Original data + Difference data)
for (uint i = 0; i < differenceLength; i++, n++, o++)
{
patchedBuffer[n] = differenceBlock[i];
if (o < originalData.Length)
{
patchedBuffer[n] += originalData[o];
}
}
differenceBlock += differenceLength;
// Apply the extra data patch (New data)
for (int e = 0; e < extraLength; e++)
{
patchedBuffer[n++] = extraBlock[e];
}
extraBlock += extraLength;
unchecked
{
o += (sourceOffset & 0x80000000) != 0 ? (0x80000000 - sourceOffset) : sourceOffset;
}
}
}
catch (IndexOutOfRangeException ex)
{
throw new InvalidDataException(ErrorMessages.GetString("Bsd0PatchInvalidData"), ex);
}
return(patchedBuffer);
}
}
/// <summary>Initializes a new instance of the <see cref="MpqVersionNotSupportedException"/> class.</summary>
internal MpqVersionNotSupportedException(ushort version)
: base(ErrorMessages.GetString(string.Format("MpqVersionNotSupported", version)))
{
}
internal SeedNotFoundException(long block)
: base(string.Format(ErrorMessages.GetString("SeedNotFound"), block))
{
}