>From edd15d7d71e7309937c27dd9e6eab56bf42cc589 Mon Sep 17 00:00:00 2001
From: Johannes Kroll <jkroll@lavabit.com>
Date: Wed, 9 Jan 2013 02:40:34 +0100
Subject: terminate sysex messages

---
 dlls/winmm/winmm.c |   16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/dlls/winmm/winmm.c b/dlls/winmm/winmm.c
index aecb9cf..1f8ea10 100644
--- a/dlls/winmm/winmm.c
+++ b/dlls/winmm/winmm.c
@@ -531,11 +531,27 @@ UINT WINAPI midiOutLongMsg(HMIDIOUT hMidiOut,
 			   MIDIHDR* lpMidiOutHdr, UINT uSize)
 {
     LPWINE_MLD		wmld;
+    int i;
 
     TRACE("(%p, %p, %d)\n", hMidiOut, lpMidiOutHdr, uSize);
 
     if ((wmld = MMDRV_Get(hMidiOut, MMDRV_MIDIOUT, FALSE)) == NULL)
 	return MMSYSERR_INVALHANDLE;
+    
+    for(i= 0; i<lpMidiOutHdr->dwBufferLength; i++)
+    {
+        /* SysEx messages are terminated by a 0xF7 byte. If the buffer contains additional bytes, send only the bytes up to the termination byte. */
+        if((unsigned char)lpMidiOutHdr->lpData[i] == 0xF7 && i < lpMidiOutHdr->dwBufferLength-1)
+        {
+            DWORD oldBufferLength = lpMidiOutHdr->dwBufferLength;
+            DWORD ret;
+            lpMidiOutHdr->dwBufferLength = i+1;
+            ret = MMDRV_Message(wmld, MODM_LONGDATA, (DWORD_PTR)lpMidiOutHdr, uSize);
+            /* restore the midi header to its original state. */
+            lpMidiOutHdr->dwBufferLength = oldBufferLength;
+            return ret;
+        }
+    }
 
     return MMDRV_Message(wmld, MODM_LONGDATA, (DWORD_PTR)lpMidiOutHdr, uSize);
 }
-- 
1.7.9.5