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hidclass.sys: Avoid magic constants in ringbuffer implementation. 

Signed-off-by: Sebastian Lackner <sebastian@fds-team.de>
Signed-off-by: Aric Stewart <aric@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Sebastian Lackner 2016-10-27 16:40:35 +02:00 committed by Alexandre Julliard
parent 3126d9ca4c
commit 115c69110d
1 changed files with 14 additions and 9 deletions
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23
dlls/hidclass.sys/buffer.c
View File

@ -26,6 +26,7 @@
WINE_DEFAULT_DEBUG_CHANNEL(hid);
#define POINTER_UNUSED 0xffffffff
#define BASE_BUFFER_SIZE 32
#define MIN_BUFFER_SIZE 2
#define MAX_BUFFER_SIZE 512
@ -34,7 +35,7 @@ struct ReportRingBuffer
{
UINT start, end, size;
int *pointers;
UINT *pointers;
UINT pointer_alloc;
UINT buffer_size;
@ -46,7 +47,10 @@ struct ReportRingBuffer
struct ReportRingBuffer* RingBuffer_Create(UINT buffer_size)
{
struct ReportRingBuffer *ring;
int i;
TRACE("Create Ring Buffer with buffer size %i\n",buffer_size);
ring = HeapAlloc(GetProcessHeap(), 0, sizeof(*ring));
if (!ring)
return NULL;
@ -54,13 +58,14 @@ struct ReportRingBuffer* RingBuffer_Create(UINT buffer_size)
ring->size = BASE_BUFFER_SIZE;
ring->buffer_size = buffer_size;
ring->pointer_alloc = 2;
ring->pointers = HeapAlloc(GetProcessHeap(), 0, sizeof(int) * ring->pointer_alloc);
ring->pointers = HeapAlloc(GetProcessHeap(), 0, sizeof(UINT) * ring->pointer_alloc);
if (!ring->pointers)
{
HeapFree(GetProcessHeap(), 0, ring);
return NULL;
}
memset(ring->pointers, 0xff, sizeof(int) * ring->pointer_alloc);
for (i = 0; i < ring->pointer_alloc; i++)
ring->pointers[i] = POINTER_UNUSED;
ring->buffer = HeapAlloc(GetProcessHeap(), 0, buffer_size * ring->size);
if (!ring->buffer)
{
@ -104,7 +109,7 @@ NTSTATUS RingBuffer_SetSize(struct ReportRingBuffer *ring, UINT size)
ring->start = ring->end = 0;
for (i = 0; i < ring->pointer_alloc; i++)
{
if (ring->pointers[i] != 0xffffffff)
if (ring->pointers[i] != POINTER_UNUSED)
ring->pointers[i] = 0;
}
new_buffer = HeapAlloc(GetProcessHeap(), 0, ring->buffer_size * size);
@ -125,7 +130,7 @@ void RingBuffer_Read(struct ReportRingBuffer *ring, UINT index, void *output, UI
void *ret = NULL;
EnterCriticalSection(&ring->lock);
if (index >= ring->pointer_alloc || ring->pointers[index] == 0xffffffff)
if (index >= ring->pointer_alloc || ring->pointers[index] == POINTER_UNUSED)
{
LeaveCriticalSection(&ring->lock);
*size = 0;
@ -153,15 +158,15 @@ UINT RingBuffer_AddPointer(struct ReportRingBuffer *ring)
UINT idx;
EnterCriticalSection(&ring->lock);
for (idx = 0; idx < ring->pointer_alloc; idx++)
if (ring->pointers[idx] == -1)
if (ring->pointers[idx] == POINTER_UNUSED)
break;
if (idx >= ring->pointer_alloc)
{
int count = idx = ring->pointer_alloc;
ring->pointer_alloc *= 2;
ring->pointers = HeapReAlloc(GetProcessHeap(), 0, ring->pointers, sizeof(int) * ring->pointer_alloc);
ring->pointers = HeapReAlloc(GetProcessHeap(), 0, ring->pointers, sizeof(UINT) * ring->pointer_alloc);
for( ;count < ring->pointer_alloc; count++)
ring->pointers[count] = -1;
ring->pointers[count] = POINTER_UNUSED;
}
ring->pointers[idx] = ring->start;
LeaveCriticalSection(&ring->lock);
@ -172,7 +177,7 @@ void RingBuffer_RemovePointer(struct ReportRingBuffer *ring, UINT index)
{
EnterCriticalSection(&ring->lock);
if (index < ring->pointer_alloc)
ring->pointers[index] = 0xffffffff;
ring->pointers[index] = POINTER_UNUSED;
LeaveCriticalSection(&ring->lock);
}