[PATCH] winecoreaudio.drv: Only read 'length' bytes from received MIDIPackets.

[Brendan Shanks]

The Core MIDI MIDIPacket struct is declared with a 256-byte data array,
but this is just for convenience. There may be only one accessible byte,
or there may be more than 256.
Only read 'length' bytes from the packet, and correctly handle a
length > 256.

Signed-off-by: Brendan Shanks <bshanks at codeweavers.com>
---

The previous code was also passing a 260 byte struct by value, and
copying around 256 bytes even though most MIDI messages are only a few
bytes.

 dlls/winecoreaudio.drv/coremidi.c |  7 ++-----
 dlls/winecoreaudio.drv/coremidi.h |  8 +-------
 dlls/winecoreaudio.drv/midi.c     | 18 +++++++++++++++---
 3 files changed, 18 insertions(+), 15 deletions(-)

diff --git a/dlls/winecoreaudio.drv/coremidi.c b/dlls/winecoreaudio.drv/coremidi.c
index 5ec564603a9..94761b05c4f 100644
--- a/dlls/winecoreaudio.drv/coremidi.c
+++ b/dlls/winecoreaudio.drv/coremidi.c
@@ -57,15 +57,12 @@ void CoreMIDI_GetObjectName(MIDIObjectRef obj, char *name, int size)
 void MIDIIn_ReadProc(const MIDIPacketList *pktlist, void *refCon, void *connRefCon)
 {
     unsigned int i;
-    MIDIMessage msg;
 
     MIDIPacket *packet = (MIDIPacket *)pktlist->packet;
     for (i = 0; i < pktlist->numPackets; ++i) {
-        msg.devID = *((UInt16 *)connRefCon);
-        msg.length = packet->length;
-        memcpy(msg.data, packet->data, sizeof(packet->data));
+        UInt16 devID = *((UInt16 *)connRefCon);
 
-        MIDIIn_SendMessage(msg);
+        MIDIIn_SendMessage(devID, packet->data, packet->length);
 
         packet = MIDIPacketNext(packet);
     }
diff --git a/dlls/winecoreaudio.drv/coremidi.h b/dlls/winecoreaudio.drv/coremidi.h
index c93edc6c31d..3433a1d4342 100644
--- a/dlls/winecoreaudio.drv/coremidi.h
+++ b/dlls/winecoreaudio.drv/coremidi.h
@@ -65,12 +65,6 @@ extern int AudioUnit_SetVolume(AudioUnit au, float left, float right);
 extern int AudioUnit_GetVolume(AudioUnit au, float *left, float *right);
 #endif
 
-typedef struct {
-    UInt16 devID;
-    UInt16 length;
-    Byte data[256];
-} MIDIMessage;
-
 /* coremidi.c */
 extern MIDIClientRef CoreMIDI_CreateClient(CFStringRef name);
 extern void CoreMIDI_GetObjectName(MIDIObjectRef obj, char *name, int size);
@@ -79,6 +73,6 @@ extern void MIDIIn_ReadProc(const MIDIPacketList *pktlist, void *refCon, void *c
 extern void MIDIOut_Send(MIDIPortRef port, MIDIEndpointRef dest, UInt8 *buffer, unsigned length);
 
 /* midi.c */
-void MIDIIn_SendMessage(MIDIMessage msg);
+void MIDIIn_SendMessage(UInt16 devID, const void *buffer, UInt16 length);
 
 #endif
diff --git a/dlls/winecoreaudio.drv/midi.c b/dlls/winecoreaudio.drv/midi.c
index edaf1283124..c299d116f12 100644
--- a/dlls/winecoreaudio.drv/midi.c
+++ b/dlls/winecoreaudio.drv/midi.c
@@ -78,6 +78,12 @@ typedef struct tagMIDISource {
     DWORD startTime;
 } MIDISource;
 
+typedef struct {
+    UInt16 devID;
+    UInt16 length;
+    Byte data[];
+} MIDIMessage;
+
 static CRITICAL_SECTION midiInLock; /* Critical section for MIDI In */
 static CFStringRef MIDIInThreadPortName = NULL;
 
@@ -797,16 +803,22 @@ static DWORD MIDIIn_Reset(WORD wDevID)
  *  Call from CoreMIDI IO threaded callback,
  *  we can't call Wine debug channels, critical section or anything using NtCurrentTeb here.
  */
-void MIDIIn_SendMessage(MIDIMessage msg)
+void MIDIIn_SendMessage(UInt16 devID, const void *buffer, UInt16 length)
 {
-    CFDataRef data;
+    MIDIMessage msg;
+    CFMutableDataRef data;
 
     CFMessagePortRef messagePort;
     messagePort = CFMessagePortCreateRemote(kCFAllocatorDefault, MIDIInThreadPortName);
 
-    data = CFDataCreate(kCFAllocatorDefault, (UInt8 *) &msg, sizeof(msg));
+    msg.devID = devID;
+    msg.length = length;
+
+    data = CFDataCreateMutable(kCFAllocatorDefault, sizeof(msg) + length);
     if (data)
     {
+        CFDataAppendBytes(data, (UInt8 *) &msg, sizeof(msg));
+        CFDataAppendBytes(data, buffer, length);
         CFMessagePortSendRequest(messagePort, 0, data, 0.0, 0.0, NULL, NULL);
         CFRelease(data);
     }
-- 
2.26.2