msacm: Preserve value of cbStruct in acmDriverDetails.

Ensure that the cbStruct member of the ACMDRIVERDETAILS[AW] struct is filled with a valid value before returning. Fill the cbStruct member of the ACMDRIVERDETAILS[AW] before sending a ACMDM_DRIVER_DETAILS message to an installed codec that might be a native library: native ACM codecs expect cbStruct to be valid before filling the rest of the struct with any data.

msacm: Preserve value of cbStruct in acmDriverDetails.
9a95aa7d · Alex Villacís Lasso · Alexandre Julliard · fe36b7ba · 9a95aa7d · 9a95aa7d
Commit 9a95aa7d authored Dec 20, 2005 by Alex Villacís Lasso Committed by Alexandre Julliard Dec 20, 2005
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Showing with 14 additions and 2 deletions

driver.c dlls/msacm/driver.c +5 -2

msacm.c dlls/msacm/tests/msacm.c +9 -0

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--- a/dlls/msacm/driver.c
+++ b/dlls/msacm/driver.c
@@ -184,7 +184,8 @@ MMRESULT WINAPI acmDriverDetailsA(HACMDRIVERID hadid, PACMDRIVERDETAILSA padd, D
                             sizeof(padda.szLicensing), NULL, NULL );
        WideCharToMultiByte( CP_ACP, 0, addw.szFeatures, -1, padda.szFeatures,
                             sizeof(padda.szFeatures), NULL, NULL );
-        memcpy(padd, &padda, min(padd->cbStruct, sizeof(*padd)));
+        padda.cbStruct = min(padd->cbStruct, sizeof(*padd));
+        memcpy(padd, &padda, padda.cbStruct);
    }
    return mmr;
 }
@@ -217,10 +218,12 @@ MMRESULT WINAPI acmDriverDetailsW(HACMDRIVERID hadid, PACMDRIVERDETAILSW padd, D
    mmr = acmDriverOpen(&acmDrvr, hadid, 0);
    if (mmr == MMSYSERR_NOERROR) {
        ACMDRIVERDETAILSW paddw;
+        paddw.cbStruct = sizeof(paddw);
        mmr = (MMRESULT)MSACM_Message(acmDrvr, ACMDM_DRIVER_DETAILS, (LPARAM)&paddw,  0);
 	acmDriverClose(acmDrvr, 0);
-        memcpy(padd, &paddw, min(padd->cbStruct, sizeof(*padd)));
+        paddw.cbStruct = min(padd->cbStruct, sizeof(*padd));
+        memcpy(padd, &paddw, paddw.cbStruct);
    }
    return mmr;

--- a/dlls/msacm/tests/msacm.c
+++ b/dlls/msacm/tests/msacm.c
@@ -120,6 +120,15 @@ static BOOL CALLBACK DriverEnumProc(HACMDRIVERID hadid,
       "acmDriverDetails(): rc = %08x, should be %08x\n",
       rc, MMSYSERR_NOERROR);
+    /* cbStruct should contain size of returned data (at most sizeof(dd)) 
+       TODO: should it be *exactly* sizeof(dd), as tested here?
+     */
+    if (rc == MMSYSERR_NOERROR) {    
+        ok(dd.cbStruct == sizeof(dd),
+            "acmDriverDetails(): cbStruct = %08lx, should be %08lx\n",
+            dd.cbStruct, (unsigned long)sizeof(dd));
+    }
    if (rc == MMSYSERR_NOERROR && winetest_interactive) {
        trace("  Short name: %s\n", dd.szShortName);
        trace("  Long name: %s\n", dd.szLongName);