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https://github.com/reactos/reactos.git
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168 lines
5.2 KiB
C
168 lines
5.2 KiB
C
/*
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* PROJECT: ReactOS Named Pipe FileSystem
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* LICENSE: BSD - See COPYING.ARM in the top level directory
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* FILE: drivers/filesystems/npfs/readsup.c
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* PURPOSE: Pipes Reading Support
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* PROGRAMMERS: ReactOS Portable Systems Group
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*/
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/* INCLUDES *******************************************************************/
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#include "npfs.h"
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// File ID number for NPFS bugchecking support
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#define NPFS_BUGCHECK_FILE_ID (NPFS_BUGCHECK_READSUP)
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/* FUNCTIONS ******************************************************************/
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IO_STATUS_BLOCK
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NTAPI
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NpReadDataQueue(IN PNP_DATA_QUEUE DataQueue,
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IN BOOLEAN Peek,
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IN BOOLEAN ReadOverflowOperation,
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IN PVOID Buffer,
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IN ULONG BufferSize,
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IN ULONG Mode,
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IN PNP_CCB Ccb,
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IN PLIST_ENTRY List)
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{
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PNP_DATA_QUEUE_ENTRY DataEntry, TempDataEntry;
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PVOID DataBuffer;
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ULONG DataSize, DataLength, TotalBytesCopied, RemainingSize, Offset;
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PIRP Irp;
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IO_STATUS_BLOCK IoStatus;
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BOOLEAN CompleteWrites = FALSE;
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PAGED_CODE();
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if (ReadOverflowOperation) Peek = TRUE;
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RemainingSize = BufferSize;
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IoStatus.Status = STATUS_SUCCESS;
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TotalBytesCopied = 0;
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if (Peek)
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{
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DataEntry = CONTAINING_RECORD(DataQueue->Queue.Flink,
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NP_DATA_QUEUE_ENTRY,
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QueueEntry);
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}
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else
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{
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DataEntry = CONTAINING_RECORD(NpGetNextRealDataQueueEntry(DataQueue, List),
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NP_DATA_QUEUE_ENTRY,
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QueueEntry);
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}
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while ((&DataEntry->QueueEntry != &DataQueue->Queue) && (RemainingSize))
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{
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if (!Peek ||
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DataEntry->DataEntryType == Buffered ||
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DataEntry->DataEntryType == Unbuffered)
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{
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if (DataEntry->DataEntryType == Unbuffered)
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{
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DataBuffer = DataEntry->Irp->AssociatedIrp.SystemBuffer;
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}
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else
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{
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DataBuffer = &DataEntry[1];
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}
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DataSize = DataEntry->DataSize;
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Offset = DataSize;
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if (&DataEntry->QueueEntry == DataQueue->Queue.Flink)
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{
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Offset -= DataQueue->ByteOffset;
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}
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DataLength = Offset;
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if (DataLength >= RemainingSize) DataLength = RemainingSize;
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_SEH2_TRY
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{
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RtlCopyMemory((PVOID)((ULONG_PTR)Buffer + BufferSize - RemainingSize),
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(PVOID)((ULONG_PTR)DataBuffer + DataSize - Offset),
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DataLength);
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}
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_SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
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{
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ASSERT(FALSE);
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}
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_SEH2_END;
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RemainingSize -= DataLength;
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Offset -= DataLength;
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TotalBytesCopied += DataLength;
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if (!Peek)
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{
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DataEntry->QuotaInEntry -= DataLength;
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DataQueue->QuotaUsed -= DataLength;
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DataQueue->ByteOffset += DataLength;
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CompleteWrites = TRUE;
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}
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NpCopyClientContext(Ccb, DataEntry);
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if ((Offset) || (ReadOverflowOperation && !TotalBytesCopied))
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{
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if (Mode == FILE_PIPE_MESSAGE_MODE)
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{
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IoStatus.Status = STATUS_BUFFER_OVERFLOW;
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break;
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}
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}
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else
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{
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if (!Peek || ReadOverflowOperation)
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{
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if (ReadOverflowOperation)
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{
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TempDataEntry = CONTAINING_RECORD(NpGetNextRealDataQueueEntry(DataQueue, List),
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NP_DATA_QUEUE_ENTRY,
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QueueEntry);
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ASSERT(TempDataEntry == DataEntry);
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}
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Irp = NpRemoveDataQueueEntry(DataQueue, TRUE, List);
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if (Irp)
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{
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Irp->IoStatus.Information = DataSize;
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Irp->IoStatus.Status = STATUS_SUCCESS;
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InsertTailList(List, &Irp->Tail.Overlay.ListEntry);
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}
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}
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if (Mode == FILE_PIPE_MESSAGE_MODE)
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{
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IoStatus.Status = STATUS_SUCCESS;
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break;
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}
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ASSERT(!ReadOverflowOperation);
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}
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}
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if (Peek)
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{
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DataEntry = CONTAINING_RECORD(DataEntry->QueueEntry.Flink,
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NP_DATA_QUEUE_ENTRY,
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QueueEntry);
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}
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else
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{
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DataEntry = CONTAINING_RECORD(NpGetNextRealDataQueueEntry(DataQueue, List),
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NP_DATA_QUEUE_ENTRY,
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QueueEntry);
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}
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}
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IoStatus.Information = TotalBytesCopied;
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if (CompleteWrites) NpCompleteStalledWrites(DataQueue, List);
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return IoStatus;
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}
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/* EOF */
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