mirror of
https://github.com/arehnman/yttrium-virtio-gpu.git
synced 2026-10-31 02:05:04 +00:00
Ladi Prosek
e36be0711e
Before this commit the driver failed to load if it didn't create a HID report descriptor for at least one device. The host evdev device connected to the VM may be arbitrarily obscure and not being able to drive it should not be an error condition. In general, virtio-input is a best-effort driver. It ignores what it doesn't understand, which includes ignoring everything if the evdev device description doesn't make sense. Signed-off-by: Ladi Prosek <[email protected]>
116 lines
2.7 KiB
C
116 lines
2.7 KiB
C
/**********************************************************************
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* Copyright (c) 2016-2017 Red Hat, Inc.
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*
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* File: Array.c
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*
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* Author(s):
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* Ladi Prosek <[email protected]>
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*
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* Simple dynamic array implementation
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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**********************************************************************/
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#include "precomp.h"
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#include "vioinput.h"
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#if defined(EVENT_TRACING)
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#include "Array.tmh"
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#endif
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BOOLEAN DynamicArrayReserve(PDYNAMIC_ARRAY pArray, SIZE_T cbSize)
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{
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if (pArray->Ptr == (PVOID)-1)
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{
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// an allocation has failed before, this array is no good
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return FALSE;
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}
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if (pArray->Ptr == NULL)
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{
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// initial allocation
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pArray->Size = 0;
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pArray->MaxSize = cbSize;
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pArray->Ptr = ExAllocatePoolWithTag(
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NonPagedPool,
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pArray->MaxSize,
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VIOINPUT_DRIVER_MEMORY_TAG);
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if (pArray->Ptr == NULL)
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{
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// mark as failed
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pArray->Ptr = (PVOID)-1;
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return FALSE;
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}
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}
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if (cbSize > pArray->MaxSize)
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{
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// resize needed
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PVOID OldPtr = pArray->Ptr;
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while (cbSize > pArray->MaxSize)
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{
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pArray->MaxSize *= 2;
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}
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pArray->Ptr = ExAllocatePoolWithTag(
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NonPagedPool,
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pArray->MaxSize,
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VIOINPUT_DRIVER_MEMORY_TAG);
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if (pArray->Ptr == NULL)
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{
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// mark as failed
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pArray->Ptr = (PVOID)-1;
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return FALSE;
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}
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RtlCopyMemory(pArray->Ptr, OldPtr, pArray->Size);
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ExFreePoolWithTag(OldPtr, VIOINPUT_DRIVER_MEMORY_TAG);
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}
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return TRUE;
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}
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BOOLEAN DynamicArrayAppend(PDYNAMIC_ARRAY pArray, PVOID pData, SIZE_T cbLength)
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{
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if (DynamicArrayReserve(pArray, pArray->Size + cbLength))
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{
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RtlCopyBytes((PUCHAR)pArray->Ptr + pArray->Size, pData, cbLength);
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pArray->Size += cbLength;
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return TRUE;
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}
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return FALSE;
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}
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VOID DynamicArrayDestroy(PDYNAMIC_ARRAY pArray)
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{
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if (pArray->Ptr != NULL && pArray->Ptr != (PVOID)-1)
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{
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ExFreePoolWithTag(pArray->Ptr, VIOINPUT_DRIVER_MEMORY_TAG);
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pArray->Ptr = NULL;
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}
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}
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BOOLEAN DynamicArrayIsEmpty(PDYNAMIC_ARRAY pArray)
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{
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return (pArray->Ptr == NULL || pArray->Size == 0);
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}
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PVOID DynamicArrayGet(PDYNAMIC_ARRAY pArray, SIZE_T *pcbSize)
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{
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PVOID Ptr = pArray->Ptr;
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if (Ptr == NULL || Ptr == (PVOID)-1)
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{
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if (pcbSize)
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{
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*pcbSize = 0;
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}
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return NULL;
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}
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if (pcbSize)
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{
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*pcbSize = pArray->Size;
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}
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// transferring ownership of the array to the caller
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pArray->Ptr = NULL;
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return Ptr;
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}
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