public override unsafe Native.NtStatus NtReadFileImpl(IntPtr handle, IntPtr hEvent, IntPtr *apcRoutine, IntPtr *apcContext, ref Native.IO_STATUS_BLOCK ioStatus, byte *buffer, uint length, Native.LARGE_INTEGER *byteOffset, IntPtr key) { if (!mWaveBankByHandle.TryGetValue(handle, out var waveBank)) { return(mHooks.NtReadFileHook.OriginalFunction(handle, hEvent, apcRoutine, apcContext, ref ioStatus, buffer, length, byteOffset, key)); } var offset = waveBank.FilePointer; var reqOffset = (byteOffset != null || (byteOffset != null && byteOffset->HighPart == -1 && byteOffset->LowPart == FILE_USE_FILE_POINTER_POSITION)) ? byteOffset->QuadPart : -1; var effOffset = reqOffset == -1 ? offset : reqOffset; var result = NtStatus.Success; var waveDataOffset = waveBank.Native.Header->Segments[(int)WaveBankSegmentIndex.EntryWaveData].Offset; if ((effOffset + length) <= waveDataOffset) { // Header read Unsafe.CopyBlock(buffer, waveBank.Native.Ptr + effOffset, length); SetBytesRead(handle, (int)offset, (int)length, ref ioStatus); result = NtStatus.Success; } else if (effOffset >= waveDataOffset && effOffset < waveBank.VirtualFileSize) { if ((waveBank.Native.Data->Flags & WaveBankFlags.Compact) != 0) { // TODO: compact format result = mHooks.NtReadFileHook.OriginalFunction(handle, hEvent, apcRoutine, apcContext, ref ioStatus, buffer, length, byteOffset, key); } else { ReadEntryWaveData(waveBank, effOffset, handle, hEvent, apcRoutine, apcContext, ref ioStatus, buffer, length, byteOffset, key); } } else { mLogger.Error($"{waveBank.FileName} Hnd: {handle} Unexpected read request!! Offset: {effOffset:X8} Length: {length:X8}"); result = mHooks.NtReadFileHook.OriginalFunction(handle, hEvent, apcRoutine, apcContext, ref ioStatus, buffer, length, byteOffset, key); } if (result != NtStatus.Success) { mLogger.Error($"{waveBank.FileName} Hnd: {handle} NtReadFile failed with {result}!!!"); } return(result); }
private NtStatus ReadEntryWaveData(VirtualWaveBank waveBank, long absOffset, IntPtr handle, IntPtr hEvent, IntPtr *apcRoutine, IntPtr *apcContext, ref Native.IO_STATUS_BLOCK ioStatus, byte *buffer, uint length, Native.LARGE_INTEGER *byteOffset, IntPtr key) { var status = NtStatus.Success; var handled = false; var segBaseOffset = waveBank.Native.Header->Segments[(int)WaveBankSegmentIndex.EntryWaveData].Offset; var segOffset = absOffset - segBaseOffset; for (int i = 0; i < waveBank.Entries.Count; i++) { var entry = waveBank.Entries[i]; if (segOffset < entry.Native->PlayRegion.Offset || segOffset >= (entry.Native->PlayRegion.Offset + entry.Native->PlayRegion.Length)) { continue; } var fileDataOffset = segOffset - entry.Native->PlayRegion.Offset; var readEndOffset = fileDataOffset + length; var nextDataOffset = i < waveBank.Entries.Count - 1 ? waveBank.Entries[i + 1].Native->PlayRegion.Offset : (waveBank.VirtualFileSize - segBaseOffset); if (readEndOffset > nextDataOffset) { continue; } handled = true; if (!entry.IsRedirected) { // Trigger cache miss for (int j = 0; j < mCache.Length; j++) { var cacheEntry = mCache[j].Entry; if (mCache[j].Miss()) { mLogger.Debug($"{waveBank.FileName} Hnd: {handle} Index: {j} {cacheEntry.CueName} removed from cache"); } } mLogger.Info($"{waveBank.FileName} Hnd: {handle} Index: {i} {entry.CueName} Data access Offset: 0x{absOffset:X8} Length: 0x{length:X8}"); status = mHooks.NtReadFileHook.OriginalFunction(handle, hEvent, apcRoutine, apcContext, ref ioStatus, buffer, length, byteOffset, key); } else { mLogger.Info($"{waveBank.FileName} Hnd: {handle} Index: {i} {entry.CueName} Data access Offset: 0x{absOffset:X8} Length: 0x{length:X8} redirected to {entry.FilePath}"); status = NtStatus.Success; if (fileDataOffset < 0) { mLogger.Error($"{waveBank.FileName} Hnd: {handle} Index: {i} {entry.CueName} Offset is before start of data!!!"); continue; } else if (fileDataOffset > entry.FileSize) { mLogger.Error($"{waveBank.FileName} Hnd: {handle} Index: {i} {entry.CueName} Offset is after end of data!!!"); //continue; } mLogger.Debug($"{waveBank.FileName} Hnd: {handle} Index: {i} {entry.CueName} Reading 0x{length:X8} bytes from redirected file at offset 0x{fileDataOffset:X8}"); // Get cached file stream if the file was previously opened or open a new file Stream redirectedStream = null; for (int j = 0; j < mCache.Length; j++) { if (mCache[j].Entry == entry) { // Found entry in cache, increase score mCache[j].Hit(); mLogger.Debug($"{waveBank.FileName} Hnd: {handle} Index: {i} {entry.CueName} loaded from cache"); redirectedStream = mCache[j].Stream; break; } else { // Entry is not the one we're looking for, so we lower its score var cacheEntry = mCache[j].Entry; if (mCache[j].Miss()) { mLogger.Debug($"{waveBank.FileName} Hnd: {handle} Index: {j} {cacheEntry.CueName} removed from cache"); } } } if (redirectedStream == null) { // Wasn't found in cache mLogger.Debug($"{waveBank.FileName} Hnd: {handle} Index: {i} {entry.CueName} added to cache"); redirectedStream = entry.OpenRead(); for (int j = 0; j < mCache.Length; j++) { if (mCache[j].Entry == null) { mCache[j] = new CacheEntry() { Entry = entry, Score = 1, Stream = redirectedStream }; break;; } } } // Read from redirected file into the buffer try { redirectedStream.Seek(fileDataOffset, SeekOrigin.Begin); var readBytes = redirectedStream.Read(new Span <byte>(( void * )buffer, ( int )length)); SetBytesRead(handle, ( int )waveBank.FilePointer, ( int )length, ref ioStatus); if (readBytes != length) { mLogger.Error($"{waveBank.FileName} Hnd: {handle} Index: {i} {entry.CueName} File read length doesnt match requested read length!! Expected 0x{length:X8}, Actual 0x{readBytes:X8}"); } mLogger.Debug($"{waveBank.FileName} Hnd: {handle} Index: {i} {entry.CueName} Wrote redirected file to buffer"); } catch (Exception e) { mLogger.Debug($"{waveBank.FileName} Hnd: {handle} Index: {i} {entry.CueName} Unhandled exception thrown during reading {entry.FileName}: {e}"); } } } if (!handled) { mLogger.Error($"{waveBank.FileName} Hnd: {handle} Unhandled file data read request!! Offset: 0x{absOffset:X8} Length: 0x{length:X8}"); status = mHooks.NtReadFileHook.OriginalFunction(handle, hEvent, apcRoutine, apcContext, ref ioStatus, buffer, length, byteOffset, key); } return(status); }