Aric Stewart : hidclass.sys: When processing reads fill all the buffers.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 68ecd3b76a7f3ef901cf2b648d25773b8ab9db91
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=68ecd3b76a7f3ef901cf2b648d25773b8ab9db91

Author: Aric Stewart <aric at codeweavers.com>
Date:   Thu Jan 26 08:59:22 2017 -0600

hidclass.sys: When processing reads fill all the buffers.

Signed-off-by: Aric Stewart <aric at codeweavers.com>
Signed-off-by: Sebastian Lackner <sebastian at fds-team.de>
Signed-off-by: Alexandre Julliard <julliard at winehq.org>

---

 dlls/hidclass.sys/buffer.c | 36 +++++++++++++++++++++++++++++++++++-
 dlls/hidclass.sys/device.c |  2 +-
 dlls/hidclass.sys/hid.h    |  3 ++-
 3 files changed, 38 insertions(+), 3 deletions(-)

diff --git a/dlls/hidclass.sys/buffer.c b/dlls/hidclass.sys/buffer.c
index 0b29f97..731f1e0 100644
--- a/dlls/hidclass.sys/buffer.c
+++ b/dlls/hidclass.sys/buffer.c
@@ -127,7 +127,7 @@ NTSTATUS RingBuffer_SetSize(struct ReportRingBuffer *ring, UINT size)
     return STATUS_SUCCESS;
 }
 
-void RingBuffer_Read(struct ReportRingBuffer *ring, UINT index, void *output, UINT *size)
+void RingBuffer_ReadNew(struct ReportRingBuffer *ring, UINT index, void *output, UINT *size)
 {
     void *ret = NULL;
 
@@ -155,6 +155,40 @@ void RingBuffer_Read(struct ReportRingBuffer *ring, UINT index, void *output, UI
     }
 }
 
+void RingBuffer_Read(struct ReportRingBuffer *ring, UINT index, void *output, UINT *size)
+{
+    int pointer;
+    void *ret = NULL;
+
+    EnterCriticalSection(&ring->lock);
+    if (index >= ring->pointer_alloc || ring->pointers[index] == POINTER_UNUSED
+        || ring->end == ring->start)
+    {
+        LeaveCriticalSection(&ring->lock);
+        *size = 0;
+        return;
+    }
+
+    pointer = ring->pointers[index];
+
+    if (pointer == ring->end)
+        pointer--;
+
+    if (pointer < 0)
+        pointer = ring->size - 1;
+
+    ret = &ring->buffer[pointer * ring->buffer_size];
+    memcpy(output, ret, ring->buffer_size);
+    if (pointer == ring->pointers[index])
+    {
+        ring->pointers[index]++;
+        if (ring->pointers[index] == ring->size)
+            ring->pointers[index] = 0;
+    }
+    LeaveCriticalSection(&ring->lock);
+    *size = ring->buffer_size;
+}
+
 UINT RingBuffer_AddPointer(struct ReportRingBuffer *ring)
 {
     UINT idx;
diff --git a/dlls/hidclass.sys/device.c b/dlls/hidclass.sys/device.c
index fe79212..ff9655e 100644
--- a/dlls/hidclass.sys/device.c
+++ b/dlls/hidclass.sys/device.c
@@ -663,7 +663,7 @@ NTSTATUS WINAPI HID_Device_read(DEVICE_OBJECT *device, IRP *irp)
     ptr = PtrToUlong( irp->Tail.Overlay.OriginalFileObject->FsContext );
 
     irp->IoStatus.Information = 0;
-    RingBuffer_Read(ext->ring_buffer, ptr, packet, &buffer_size);
+    RingBuffer_ReadNew(ext->ring_buffer, ptr, packet, &buffer_size);
 
     if (buffer_size)
     {
diff --git a/dlls/hidclass.sys/hid.h b/dlls/hidclass.sys/hid.h
index adc547c..1829319 100644
--- a/dlls/hidclass.sys/hid.h
+++ b/dlls/hidclass.sys/hid.h
@@ -62,7 +62,8 @@ typedef struct _BASE_DEVICE_EXTENSION {
 void RingBuffer_Write(struct ReportRingBuffer *buffer, void *data) DECLSPEC_HIDDEN;
 UINT RingBuffer_AddPointer(struct ReportRingBuffer *buffer) DECLSPEC_HIDDEN;
 void RingBuffer_RemovePointer(struct ReportRingBuffer *ring, UINT index) DECLSPEC_HIDDEN;
-void RingBuffer_Read(struct ReportRingBuffer *buffer, UINT index, void *output, UINT *size) DECLSPEC_HIDDEN;
+void RingBuffer_Read(struct ReportRingBuffer *ring, UINT index, void *output, UINT *size) DECLSPEC_HIDDEN;
+void RingBuffer_ReadNew(struct ReportRingBuffer *buffer, UINT index, void *output, UINT *size) DECLSPEC_HIDDEN;
 UINT RingBuffer_GetBufferSize(struct ReportRingBuffer *buffer) DECLSPEC_HIDDEN;
 UINT RingBuffer_GetSize(struct ReportRingBuffer *buffer) DECLSPEC_HIDDEN;
 void RingBuffer_Destroy(struct ReportRingBuffer *buffer) DECLSPEC_HIDDEN;