[PATCH v2 04/15] ole32: Rework property (de)serialization

Jonas Kümmerlin rgcjonas at gmail.com
Sat Jul 18 11:26:43 CDT 2015


The new code tries to protect itself against buffer overflows and
handles a lot more cases.

The implementation of StgConvertPropertyToVariant/StgConvertVariantToProperty
has been improved.
---
 dlls/msi/tests/suminfo.c       |    4 +-
 dlls/ole32/stg_prop.c          | 1717 +++++++++++++++++++++++++++++++++-------
 dlls/ole32/tests/propvariant.c |   86 +-
 include/propidl.idl            |    2 +
 4 files changed, 1535 insertions(+), 274 deletions(-)

diff --git a/dlls/msi/tests/suminfo.c b/dlls/msi/tests/suminfo.c
index 8c2e292..d121f75 100644
--- a/dlls/msi/tests/suminfo.c
+++ b/dlls/msi/tests/suminfo.c
@@ -438,7 +438,7 @@ static void test_summary_binary(void)
     ival = -1;
     r = MsiSummaryInfoGetPropertyA(hsuminfo, PID_WORDCOUNT, &type, &ival, NULL, NULL, NULL);
     ok(r == ERROR_SUCCESS, "MsiSummaryInfoGetProperty failed\n");
-    todo_wine ok( ival == 0, "value incorrect\n");
+    ok( ival == 0, "value incorrect\n");
 
     /* looks like msi adds some of its own values in here */
     count = 0;
@@ -447,7 +447,7 @@ static void test_summary_binary(void)
     todo_wine ok(count == 10, "prop count incorrect\n");
 
     r = MsiSummaryInfoSetPropertyA( hsuminfo, PID_TITLE, VT_LPSTR, 0, NULL, "Mike" );
-    ok(r == ERROR_FUNCTION_FAILED, "MsiSummaryInfoSetProperty failed %u\n", r);
+    todo_wine ok(r == ERROR_FUNCTION_FAILED, "MsiSummaryInfoSetProperty failed %u\n", r);
 
     r = MsiSummaryInfoPersist( hsuminfo );
     ok(r == ERROR_FUNCTION_FAILED, "MsiSummaryInfoPersist failed %u\n", r);
diff --git a/dlls/ole32/stg_prop.c b/dlls/ole32/stg_prop.c
index da361ce..f818998 100644
--- a/dlls/ole32/stg_prop.c
+++ b/dlls/ole32/stg_prop.c
@@ -144,6 +144,17 @@ static HRESULT PropertyStorage_PropVariantCopy(PROPVARIANT *prop,
 static HRESULT PropertyStorage_StringCopy(LPCSTR src, LCID srcCP, LPSTR *dst,
  LCID targetCP);
 
+/* Like PropertyStorage_StringCopy, but returns the size that needs to be allocated.
+ */
+static HRESULT PropertyStorage_StringCopy_Size(LPCSTR src, LCID srcCP,
+                                               DWORD *dstSize, LCID targetCP);
+
+/* Like PropertyStorage_StringCopy, but uses a caller-supplied buffer.
+ */
+static HRESULT PropertyStorage_StringCopy_Buffer(LPCSTR src, LCID srcCP,
+                                                 LPSTR  dst, DWORD cbDst, LCID targetCP);
+
+
 static const IPropertyStorageVtbl IPropertyStorage_Vtbl;
 static const IEnumSTATPROPSETSTGVtbl IEnumSTATPROPSETSTG_Vtbl;
 static const IEnumSTATPROPSTGVtbl IEnumSTATPROPSTG_Vtbl;
@@ -354,18 +365,81 @@ static HRESULT WINAPI IPropertyStorage_fnReadMultiple(
     return hr;
 }
 
-static HRESULT PropertyStorage_StringCopy(LPCSTR src, LCID srcCP, LPSTR *dst,
- LCID dstCP)
+static HRESULT PropertyStorage_StringCopy_Size(LPCSTR src, LCID srcCP,
+                                               DWORD *dstSize, LCID dstCP)
 {
     HRESULT hr = S_OK;
-    int len;
+    DWORD   size;
 
     TRACE("%s, %p, %d, %d\n",
+          srcCP == CP_UNICODE ? debugstr_w((LPCWSTR)src) : debugstr_a(src),
+          dstSize, dstCP, srcCP);
+
+    assert(src);
+    assert(dstSize);
+    *dstSize = 0;
+    if (dstCP == srcCP)
+    {
+        if (dstCP == CP_UNICODE)
+            size = (strlenW((LPCWSTR)src) + 1) * sizeof(WCHAR);
+        else
+            size = strlen(src) + 1;
+    }
+    else
+    {
+        if (dstCP == CP_UNICODE)
+        {
+            size = MultiByteToWideChar(srcCP, 0, src, -1, NULL, 0) * sizeof(WCHAR);
+        }
+        else
+        {
+            LPCWSTR wideStr = NULL;
+            LPWSTR wideStr_tmp = NULL;
+
+            if (srcCP == CP_UNICODE)
+                wideStr = (LPCWSTR)src;
+            else
+            {
+                int len = MultiByteToWideChar(srcCP, 0, src, -1, NULL, 0);
+                wideStr_tmp = HeapAlloc(GetProcessHeap(), 0, len * sizeof(WCHAR));
+                if (wideStr_tmp)
+                {
+                    MultiByteToWideChar(srcCP, 0, src, -1, wideStr_tmp, len);
+                    wideStr = wideStr_tmp;
+                }
+                else
+                    hr = STG_E_INSUFFICIENTMEMORY;
+            }
+            if (SUCCEEDED(hr))
+            {
+                size = WideCharToMultiByte(dstCP, 0, wideStr, -1, NULL, 0,
+                 NULL, NULL);
+            }
+            HeapFree(GetProcessHeap(), 0, wideStr_tmp);
+        }
+    }
+
+    TRACE("returning 0x%08x (%u)\n", hr, size);
+
+    *dstSize = size;
+    return hr;
+}
+
+/* Like PropertyStorage_StringCopy, but uses a user-supplied buffer.
+ */
+static HRESULT PropertyStorage_StringCopy_Buffer(LPCSTR src, LCID srcCP,
+                                                 LPSTR  dst, DWORD cbDst,
+                                                 LCID dstCP)
+{
+    HRESULT hr = S_OK;
+    int len;
+
+    TRACE("%s, %p, %u, %d, %d\n",
      srcCP == CP_UNICODE ? debugstr_w((LPCWSTR)src) : debugstr_a(src), dst,
-     dstCP, srcCP);
+     cbDst, dstCP, srcCP);
     assert(src);
     assert(dst);
-    *dst = NULL;
+
     if (dstCP == srcCP)
     {
         size_t len;
@@ -374,22 +448,21 @@ static HRESULT PropertyStorage_StringCopy(LPCSTR src, LCID srcCP, LPSTR *dst,
             len = (strlenW((LPCWSTR)src) + 1) * sizeof(WCHAR);
         else
             len = strlen(src) + 1;
-        *dst = CoTaskMemAlloc(len * sizeof(WCHAR));
-        if (!*dst)
-            hr = STG_E_INSUFFICIENTMEMORY;
+
+        if (cbDst < len)
+            hr = STG_E_INVALIDPARAMETER;
         else
-            memcpy(*dst, src, len);
+            memcpy(dst, src, len);
     }
     else
     {
         if (dstCP == CP_UNICODE)
         {
             len = MultiByteToWideChar(srcCP, 0, src, -1, NULL, 0);
-            *dst = CoTaskMemAlloc(len * sizeof(WCHAR));
-            if (!*dst)
+            if (cbDst < (len * sizeof(WCHAR)))
                 hr = STG_E_INSUFFICIENTMEMORY;
             else
-                MultiByteToWideChar(srcCP, 0, src, -1, (LPWSTR)*dst, len);
+                MultiByteToWideChar(srcCP, 0, src, -1, (LPWSTR)dst, len);
         }
         else
         {
@@ -412,20 +485,24 @@ static HRESULT PropertyStorage_StringCopy(LPCSTR src, LCID srcCP, LPSTR *dst,
             }
             if (SUCCEEDED(hr))
             {
+                TRACE("Converted to wide string %s\n", debugstr_w(wideStr));
+
                 len = WideCharToMultiByte(dstCP, 0, wideStr, -1, NULL, 0,
                  NULL, NULL);
-                *dst = CoTaskMemAlloc(len);
-                if (!*dst)
-                    hr = STG_E_INSUFFICIENTMEMORY;
+                if (cbDst < len)
+                    hr = STG_E_INVALIDPARAMETER;
                 else
                 {
                     BOOL defCharUsed = FALSE;
+                    BOOL *lpDefCharUsed = &defCharUsed;
+
+                    /* for CP_UTF8/CP_UTF7, we may not even supply lpDefChar */
+                    if (dstCP == CP_UTF8 || dstCP == CP_UTF7)
+                        lpDefCharUsed = NULL;
 
-                    if (WideCharToMultiByte(dstCP, 0, wideStr, -1, *dst, len,
-                     NULL, &defCharUsed) == 0 || defCharUsed)
+                    if (WideCharToMultiByte(dstCP, 0, wideStr, -1, dst, len,
+                     NULL, lpDefCharUsed) == 0 || defCharUsed)
                     {
-                        CoTaskMemFree(*dst);
-                        *dst = NULL;
                         hr = HRESULT_FROM_WIN32(ERROR_NO_UNICODE_TRANSLATION);
                     }
                 }
@@ -434,7 +511,34 @@ static HRESULT PropertyStorage_StringCopy(LPCSTR src, LCID srcCP, LPSTR *dst,
         }
     }
     TRACE("returning 0x%08x (%s)\n", hr,
-     dstCP == CP_UNICODE ? debugstr_w((LPCWSTR)*dst) : debugstr_a(*dst));
+     dstCP == CP_UNICODE ? debugstr_w((LPCWSTR)dst) : debugstr_a(dst));
+    return hr;
+}
+
+static HRESULT PropertyStorage_StringCopy(LPCSTR src, LCID srcCP, LPSTR *dst,
+ LCID dstCP)
+{
+    HRESULT hr;
+    DWORD   size;
+
+    assert(src);
+    assert(dst);
+
+    hr = PropertyStorage_StringCopy_Size(src, srcCP, &size, dstCP);
+    if (FAILED(hr))
+        return hr;
+
+    *dst = CoTaskMemAlloc(size);
+    if (!*dst)
+        return STG_E_INSUFFICIENTMEMORY;
+
+    hr = PropertyStorage_StringCopy_Buffer(src, srcCP, *dst, size, dstCP);
+    if (FAILED(hr))
+    {
+        CoTaskMemFree(*dst);
+        *dst = NULL;
+    }
+
     return hr;
 }
 
@@ -1003,218 +1107,1328 @@ static HRESULT PropertyStorage_ReadDictionary(PropertyStorage_impl *This,
     assert(This->name_to_propid);
     assert(This->propid_to_name);
 
-    StorageUtl_ReadDWord(ptr, 0, &numEntries);
-    TRACE("Reading %d entries:\n", numEntries);
-    ptr += sizeof(DWORD);
-    for (i = 0; SUCCEEDED(hr) && i < numEntries; i++)
-    {
-        PROPID propid;
-        DWORD cbEntry;
+    StorageUtl_ReadDWord(ptr, 0, &numEntries);
+    TRACE("Reading %d entries:\n", numEntries);
+    ptr += sizeof(DWORD);
+    for (i = 0; SUCCEEDED(hr) && i < numEntries; i++)
+    {
+        PROPID propid;
+        DWORD cbEntry;
+
+        StorageUtl_ReadDWord(ptr, 0, &propid);
+        ptr += sizeof(PROPID);
+        StorageUtl_ReadDWord(ptr, 0, &cbEntry);
+        ptr += sizeof(DWORD);
+        TRACE("Reading entry with ID 0x%08x, %d bytes\n", propid, cbEntry);
+        /* Make sure the source string is NULL-terminated */
+        if (This->codePage != CP_UNICODE)
+            ptr[cbEntry - 1] = '\0';
+        else
+            *((LPWSTR)ptr + cbEntry / sizeof(WCHAR)) = '\0';
+        hr = PropertyStorage_StoreNameWithId(This, (char*)ptr, This->codePage, propid);
+        if (This->codePage == CP_UNICODE)
+        {
+            /* Unicode entries are padded to DWORD boundaries */
+            if (cbEntry % sizeof(DWORD))
+                ptr += sizeof(DWORD) - (cbEntry % sizeof(DWORD));
+        }
+        ptr += sizeof(DWORD) + cbEntry;
+    }
+    return hr;
+}
+
+static void* WINAPI Allocate_CoTaskMemAlloc(void *this, ULONG size)
+{
+    return CoTaskMemAlloc(size);
+}
+
+/* HACK to hide (ULONG)(something) < 0 from the analyzer */
+static inline int gt(ULONG a, ULONG b) { return a > b; }
+
+/* Base implementation for deserializing properties.
+ * Used by:
+ *      - IPropertyStorage
+ *      - StgConvertPropertyToVariant
+ *      - StgDeserializeProperty [propsys.dll]
+ *
+ * This handles all straightforward cases, only crazy stuff like indirect
+ * properties have to be handled by the caller itself.
+ *
+ * Allocator:
+ *      The only sane allocator you could pass is NULL, in which case CoTaskMemAlloc
+ *      is used. The allocator parameter just there to make the brain-damaged
+ *      interface of StgConvertPropertyToVariant work.
+ *
+ * Codepages:
+ *      Serialized properties have no intrinsic knowledge of their codepage.
+ *      VT_LPSTR and VT_BSTR will be interpreted using the given $diskCodepage,
+ *      and VT_LPSTR will then be converted to $runningCodepage.
+ *      $diskCodepage=CP_UNICODE is a sensible choice, but the OLE storage may
+ *      also use some ANSI codepage.
+ *      $runningCodepage=CP_ACP is the only sensible choice, but the current
+ *      storage implementation passes $runningCodepage=$diskCodepage and converts
+ *      narrow strings at a later stage (TODO: change this).
+ *
+ * NOTICE: In case the reading fails, a partially initialized PROPVARIANT may be
+ *         returned that has to be freed (using PropVariantClear, unless you
+ *         used a custom allocator, in which case you basically have to
+ *         reimplement PropVariantClear).
+ *
+ * TODO: Array handling
+ */
+static HRESULT PropertyStorage_ReadProperty(PROPVARIANT *prop, const BYTE *data,
+    ULONG cbData, ULONG *pcbDataUsed, UINT diskCodepage, UINT runningCodepage,
+    void* (WINAPI *allocate)(void *this, ULONG size), void *allocate_data)
+{
+    HRESULT hr = S_OK;
+    ULONG cbData_Start;
+
+    cbData_Start = cbData;
+    if (pcbDataUsed)
+        *pcbDataUsed = 0;
+
+#define FAIL_IF_EOF(cbytes) \
+    do { \
+        if ((ULONG)cbytes > cbData) \
+            return STG_E_INVALIDPARAMETER; \
+    } while (0)
+#define MOVE_FORWARD(bytes) \
+    do { \
+        FAIL_IF_EOF(bytes); \
+        data += bytes; \
+        cbData -= bytes; \
+    } while (0)
+#define READ_WORD_AND_MOVE(location) \
+    do { \
+        FAIL_IF_EOF(2); \
+        StorageUtl_ReadWord(data, 0, (location)); \
+        MOVE_FORWARD(2); \
+    } while (0)
+#define READ_DWORD_AND_MOVE(location) \
+    do { \
+        FAIL_IF_EOF(4); \
+        StorageUtl_ReadDWord(data, 0, (location)); \
+        MOVE_FORWARD(4); \
+    } while (0)
+#define ALLOCATE_OR_FAIL(pptr, cbEl, nEl) \
+    do { \
+        *(pptr) = allocate(allocate_data, (cbEl) * (nEl)); \
+        if (!*(pptr)) \
+        { \
+            return STG_E_INSUFFICIENTMEMORY; \
+        } \
+    } while(0)
+
+#define FOR_POSSIBLE_VECTOR(ctype, singleMember, vectorMember, cbBlock) \
+    ctype *vec; \
+    DWORD  vecsize; \
+    if (!(prop->vt & VT_VECTOR)) \
+    { \
+        vecsize = 1; \
+        vec = &prop->u.singleMember; \
+    } \
+    else \
+    { \
+        READ_DWORD_AND_MOVE(&vecsize); \
+        prop->u.vectorMember.cElems = vecsize; \
+        ALLOCATE_OR_FAIL(&prop->u.vectorMember.pElems, sizeof(ctype), vecsize); \
+        vec = prop->u.vectorMember.pElems; \
+        ZeroMemory(vec, sizeof(ctype) * vecsize); \
+    } \
+    for (; vecsize; --vecsize, ++vec, data += (cbBlock), cbData -= (cbBlock)) \
+        if (gt((ULONG)(cbBlock), cbData)) \
+            return STG_E_INVALIDPARAMETER; \
+        else
+#define FOR_POSSIBLE_VECTOR_OR_SINGLEP(ctype, singleMemberP, vectorMember, cbBlock) \
+    ctype *vec; \
+    DWORD  vecsize; \
+    if (!(prop->vt & VT_VECTOR)) \
+    { \
+        vecsize = 1; \
+        ALLOCATE_OR_FAIL(&prop->u.singleMemberP, sizeof(ctype), 1); \
+        vec = prop->u.singleMemberP; \
+    } \
+    else \
+    { \
+        READ_DWORD_AND_MOVE(&vecsize); \
+        prop->u.vectorMember.cElems = vecsize; \
+        ALLOCATE_OR_FAIL(&prop->u.vectorMember.pElems, sizeof(ctype), vecsize); \
+        vec = prop->u.vectorMember.pElems; \
+        ZeroMemory(vec, sizeof(ctype) * vecsize); \
+    } \
+    for (; vecsize; --vecsize, ++vec, data += (cbBlock), cbData -= (cbBlock)) \
+        if (gt((ULONG)(cbBlock), cbData)) \
+            return STG_E_INVALIDPARAMETER; \
+        else
+#define CASE_OR_VECTOR(vtype) \
+    case vtype: \
+    case VT_VECTOR|vtype:
+
+    if (!allocate)
+        allocate = &Allocate_CoTaskMemAlloc;
+
+    assert(prop);
+    assert(data);
+
+    ZeroMemory(prop, sizeof(*prop));
+
+    READ_DWORD_AND_MOVE((DWORD *)&prop->vt);
+
+    switch (prop->vt)
+    {
+    case VT_EMPTY:
+    case VT_NULL:
+        break;
+    CASE_OR_VECTOR(VT_I1)
+    {
+        FOR_POSSIBLE_VECTOR(char, cVal, cac, 1)
+        {
+            *vec = *(const char *)data;
+            TRACE("Read char 0x%x ('%c')\n", vec[0], vec[0]);
+        }
+        break;
+    }
+    CASE_OR_VECTOR(VT_UI1)
+    {
+        FOR_POSSIBLE_VECTOR(BYTE, bVal, caub, 1)
+        {
+            *vec = *data;
+            TRACE("Read byte 0x%x\n", *vec);
+        }
+        break;
+    }
+    CASE_OR_VECTOR(VT_I2)
+    {
+        FOR_POSSIBLE_VECTOR(SHORT, iVal, cai, 2)
+        {
+            StorageUtl_ReadWord(data, 0, (WORD*)vec);
+            TRACE("Read short %d\n", (int)*vec);
+        }
+        break;
+    }
+    CASE_OR_VECTOR(VT_UI2)
+    CASE_OR_VECTOR(VT_BOOL) /* VARIANT_BOOL == USHORT */
+    {
+        FOR_POSSIBLE_VECTOR(USHORT, uiVal, caui, 2)
+        {
+            StorageUtl_ReadWord(data, 0, vec);
+            TRACE("Read ushort %d\n", (int)*vec);
+        }
+        break;
+    }
+    CASE_OR_VECTOR(VT_INT)
+    CASE_OR_VECTOR(VT_I4)
+    CASE_OR_VECTOR(VT_ERROR) /* SCODE == LONG */
+    {
+        FOR_POSSIBLE_VECTOR(LONG, lVal, cal, 4)
+        {
+            StorageUtl_ReadDWord(data, 0, (DWORD*)vec);
+            TRACE("Read long %u\n", (unsigned)*vec);
+        }
+        break;
+    }
+    CASE_OR_VECTOR(VT_UINT)
+    CASE_OR_VECTOR(VT_UI4)
+    {
+        FOR_POSSIBLE_VECTOR(ULONG, ulVal, caul, 4)
+        {
+            StorageUtl_ReadDWord(data, 0, vec);
+            TRACE("Read ulong %d\n", (int)*vec);
+        }
+        break;
+    }
+    CASE_OR_VECTOR(VT_I8)
+    {
+        FOR_POSSIBLE_VECTOR(LARGE_INTEGER, hVal, cah, 8)
+        {
+            StorageUtl_ReadULargeInteger(data, 0, (ULARGE_INTEGER*)vec);
+            TRACE("Read longlong 0x%08x%08x\n", (unsigned)vec->HighPart, (unsigned)vec->LowPart);
+        }
+        break;
+    }
+    CASE_OR_VECTOR(VT_UI8)
+    {
+        FOR_POSSIBLE_VECTOR(ULARGE_INTEGER, uhVal, cauh, 8)
+        {
+            StorageUtl_ReadULargeInteger(data, 0, vec);
+            TRACE("Read ulonglong 0x%08x%08x\n", (unsigned)vec->HighPart, (unsigned)vec->LowPart);
+        }
+        break;
+    }
+    CASE_OR_VECTOR(VT_LPSTR)
+    {
+        FOR_POSSIBLE_VECTOR(LPSTR, pszVal, calpstr, 0)
+        {
+            DWORD count;
+            DWORD convertedCount;
+            char *tmpbuf;
+
+            READ_DWORD_AND_MOVE(&count);
+            if (diskCodepage == CP_UNICODE && count % 2)
+            {
+                WARN("Unicode string has odd number of bytes\n");
+                return STG_E_INVALIDHEADER;
+            }
+
+            FAIL_IF_EOF(count);
+
+            /* allocate a temporary buffer to ensure NULL termination */
+            tmpbuf = HeapAlloc(GetProcessHeap(), 0, count + 1);
+            if (!tmpbuf)
+                return STG_E_INSUFFICIENTMEMORY;
+
+            memcpy(tmpbuf, data, count);
+            tmpbuf[count] = 0;
+
+            if (diskCodepage == CP_UNICODE)
+            {
+                PropertyStorage_ByteSwapString((LPWSTR)tmpbuf, count/2);
+            }
+
+            hr = PropertyStorage_StringCopy_Size(
+                                     tmpbuf,
+                                     diskCodepage,
+                                     &convertedCount,
+                                     runningCodepage);
+            if (FAILED(hr))
+            {
+                HeapFree(GetProcessHeap(), 0, tmpbuf);
+                return hr;
+            }
+
+            *vec = allocate(allocate_data, convertedCount);
+            if (!*vec)
+            {
+                HeapFree(GetProcessHeap(), 0, tmpbuf);
+                return STG_E_INSUFFICIENTMEMORY;
+            }
+
+            hr = PropertyStorage_StringCopy_Buffer(
+                                 tmpbuf,
+                                 diskCodepage,
+                                 *vec, convertedCount,
+                                 runningCodepage);
+
+            HeapFree(GetProcessHeap(), 0, tmpbuf);
+
+            if (FAILED(hr))
+                return hr;
+
+            MOVE_FORWARD(count);
+            MOVE_FORWARD((4 - (count%4)) % 4); /* padding */
+        }
+        break;
+    }
+    CASE_OR_VECTOR(VT_BSTR)
+    {
+        FOR_POSSIBLE_VECTOR(BSTR, bstrVal, cabstr, 0)
+        {
+            DWORD count, wcount;
+
+            READ_DWORD_AND_MOVE(&count);
+            if (diskCodepage == CP_UNICODE && count % 2)
+            {
+                WARN("Unicode string has odd number of bytes\n");
+                return STG_E_INVALIDHEADER;
+            }
+            else
+            {
+                FAIL_IF_EOF(count);
+
+                if (diskCodepage == CP_UNICODE)
+                    wcount = count / 2;
+                else
+                    wcount = MultiByteToWideChar(diskCodepage, 0, (LPCSTR)data, count, NULL, 0);
+
+                *vec = SysAllocStringLen(NULL, wcount); /* FIXME: use allocator? */
+
+                if (*vec)
+                {
+                    if (diskCodepage == CP_UNICODE)
+                    {
+                        memcpy(*vec, data, count);
+                        PropertyStorage_ByteSwapString(*vec, wcount);
+                    }
+                    else
+                        MultiByteToWideChar(diskCodepage, 0, (LPCSTR)data, count, *vec, wcount);
+
+                    (*vec)[wcount - 1] = '\0';
+                    TRACE("Read string value %s\n", debugstr_w(*vec));
+                }
+                else
+                {
+                    return STG_E_INSUFFICIENTMEMORY;
+                }
+            }
+
+            MOVE_FORWARD(count);
+            MOVE_FORWARD((4 - (count%4)) % 4); /* padding */
+        }
+        break;
+    }
+    case VT_BLOB:
+    {
+        DWORD count;
+
+        READ_DWORD_AND_MOVE(&count);
+        FAIL_IF_EOF(count);
+        prop->u.blob.cbSize = count;
+        prop->u.blob.pBlobData = allocate(allocate_data, count);
+        if (prop->u.blob.pBlobData)
+        {
+            memcpy(prop->u.blob.pBlobData, data, count);
+            TRACE("Read blob value of size %d\n", count);
+
+            MOVE_FORWARD(count);
+            MOVE_FORWARD((4 - (count % 4)) % 4); /* padding to 4 bytes */
+        }
+        else
+            return STG_E_INSUFFICIENTMEMORY;
+        break;
+    }
+    CASE_OR_VECTOR(VT_LPWSTR)
+    {
+        FOR_POSSIBLE_VECTOR(LPWSTR, pwszVal, calpwstr, 0)
+        {
+            DWORD count;
+
+            READ_DWORD_AND_MOVE(&count);
+            FAIL_IF_EOF(count * sizeof(WCHAR));
+            ALLOCATE_OR_FAIL(vec, sizeof(WCHAR), count);
+
+            memcpy(*vec, data, count * sizeof(WCHAR));
+
+            /* make sure string is NULL-terminated */
+            (*vec)[count - 1] = '\0';
+            PropertyStorage_ByteSwapString(*vec, count);
+            TRACE("Read string value %s\n", debugstr_w(*vec));
+
+            MOVE_FORWARD(count * sizeof(WCHAR));
+            if (count % 2)
+                MOVE_FORWARD(sizeof(WCHAR)); /* padding to 4 bytes */
+        }
+        break;
+    }
+    CASE_OR_VECTOR(VT_FILETIME)
+    {
+        ULARGE_INTEGER tmp;
+        FOR_POSSIBLE_VECTOR(FILETIME, filetime, cafiletime, 8)
+        {
+            StorageUtl_ReadULargeInteger(data, 0, &tmp);
+
+            vec->dwLowDateTime  = tmp.LowPart;
+            vec->dwHighDateTime = tmp.HighPart;
+        }
+        break;
+    }
+    CASE_OR_VECTOR(VT_CY)
+    {
+        ULARGE_INTEGER tmp;
+        FOR_POSSIBLE_VECTOR(CY, cyVal, cacy, 8)
+        {
+            StorageUtl_ReadULargeInteger(data, 0, &tmp);
+            vec->int64 = (LONGLONG)tmp.QuadPart;
+        }
+        break;
+    }
+    CASE_OR_VECTOR(VT_CF)
+    {
+        FOR_POSSIBLE_VECTOR_OR_SINGLEP(CLIPDATA, pclipdata, caclipdata, 0)
+        {
+            DWORD len = 0, tag = 0;
+
+            READ_DWORD_AND_MOVE(&len);
+            FAIL_IF_EOF(len);
+            READ_DWORD_AND_MOVE(&tag);
+            if (len > 4)
+            {
+                vec->cbSize = len;
+                vec->ulClipFmt = tag;
+
+                ALLOCATE_OR_FAIL(&vec->pClipData, 1, len - 4);
+
+                memcpy(vec->pClipData, data, len - 4);
+                MOVE_FORWARD(len - 4);
+                MOVE_FORWARD((4 - (len % 4)) % 4); /* padding */
+            }
+            else
+                return STG_E_INVALIDPARAMETER;
+        }
+        break;
+    }
+    CASE_OR_VECTOR(VT_DATE)
+    CASE_OR_VECTOR(VT_R8)
+    {
+        FOR_POSSIBLE_VECTOR(double, dblVal, cadbl, sizeof(double))
+        {
+            memcpy(vec, data, sizeof(double));
+        }
+        break;
+    }
+    CASE_OR_VECTOR(VT_R4)
+    {
+        FOR_POSSIBLE_VECTOR(float, fltVal, caflt, sizeof(float))
+        {
+            memcpy(vec, data, sizeof(float));
+        }
+        break;
+    }
+    case VT_DECIMAL:
+    {
+        DECIMAL *dec;
+
+        FAIL_IF_EOF(16);
+
+        dec = (DECIMAL*)prop;
+        dec->u.scale = data[2];
+        dec->u.sign  = data[3];
+        StorageUtl_ReadDWord(data, 4, &dec->Hi32);
+        StorageUtl_ReadULargeInteger(data, 8, (ULARGE_INTEGER*)&dec->u1);
+
+        MOVE_FORWARD(16);
+        break;
+    }
+    CASE_OR_VECTOR(VT_CLSID)
+    {
+        FOR_POSSIBLE_VECTOR_OR_SINGLEP(GUID, puuid, cauuid, 16)
+        {
+            StorageUtl_ReadGUID(data, 0, vec);
+        }
+        break;
+    }
+    case VT_VECTOR|VT_VARIANT:
+    {
+        FOR_POSSIBLE_VECTOR_OR_SINGLEP(PROPVARIANT, /* dummy */ pvarVal, capropvar, 0)
+        {
+            ULONG cbDataUsed;
+            hr = PropertyStorage_ReadProperty(vec, data, cbData, &cbDataUsed,
+                                   diskCodepage, runningCodepage, allocate, allocate_data);
+            if (FAILED(hr))
+            {
+                return hr;
+            }
+
+            data += cbDataUsed;
+            cbData -= cbDataUsed;
+        }
+        break;
+    }
+    default:
+        FIXME("unsupported type %d\n", prop->vt);
+        return STG_E_INVALIDPARAMETER;
+    }
+
+    /* Padding to 4 bytes, even for arrays of smaller integers */
+    /* This is important for handling VT_VECTOR|VT_VARIANT */
+    if (pcbDataUsed) {
+        ULONG paddingMissing;
+
+        paddingMissing = (4 - ((cbData_Start - cbData) % 4)) % 4;
+
+        if (cbData >= paddingMissing)
+            cbData -= paddingMissing;
+        else
+            cbData = 0;
+
+        *pcbDataUsed = cbData_Start - cbData;
+    }
+
+#undef FAIL_IF_EOF
+#undef READ_DWORD_AND_MOVE
+#undef READ_WORD_AND_MOVE
+#undef MOVE_FORWARD
+#undef FOR_POSSIBLE_VECTOR
+#undef FOR_POSSIBLE_VECTOR_OR_SINGLEP
+#undef ALLOCATE_OR_FAIL
+#undef CASE_OR_VECTOR
+
+    return hr;
+}
+
+/*
+ * Converts VT_BYREF properties to their non-ref counterparts
+ *
+ * NOTICE: This does not copy arrays, vectors etc., these are shared
+ *         by the input and output properties. Therefore, only one may be
+ *         eventually freed.
+ */
+static HRESULT ScrapeByRefOfProperty(const PROPVARIANT *in, PROPVARIANT *out)
+{
+    if (!(in->vt & VT_BYREF))
+    {
+        /* no ref, no problem */
+        memcpy(out, in, sizeof(*in));
+        return S_OK;
+    }
+
+    out->vt = in->vt & ~VT_BYREF;
+
+    /* BYREF properties all carry a pointer, which must not be NULL here */
+    /* It doesn't matter which one we check */
+    if (!in->u.pcVal)
+        return STG_E_INVALIDPARAMETER;
+
+    if (out->vt & VT_ARRAY)
+    {
+        out->u.parray = *in->u.pparray;
+        return S_OK;
+    }
+
+    switch (out->vt)
+    {
+        case VT_I1:
+            out->u.cVal = *in->u.pcVal;
+            break;
+        case VT_UI1:
+            out->u.bVal = *in->u.pbVal;
+            break;
+        case VT_I2:
+            out->u.iVal = *in->u.piVal;
+            break;
+        case VT_UI2:
+            out->u.uiVal = *in->u.puiVal;
+            break;
+        case VT_I4:
+        case VT_INT:
+            out->u.lVal = *in->u.plVal;
+            break;
+        case VT_UI4:
+        case VT_UINT:
+            out->u.ulVal = *in->u.pulVal;
+            break;
+        case VT_R4:
+            out->u.fltVal = *in->u.pfltVal;
+            break;
+        case VT_R8:
+            out->u.dblVal = *in->u.pdblVal;
+            break;
+        case VT_BOOL:
+            out->u.boolVal = *in->u.pboolVal;
+            break;
+        case VT_DECIMAL:
+            memcpy(out, in->u.pdecVal, sizeof(DECIMAL));
+            out->vt = VT_DECIMAL;
+            break;
+        case VT_ERROR:
+            out->u.scode = *in->u.pscode;
+            break;
+        case VT_CY:
+            memcpy(&out->u.cyVal, in->u.pcyVal, sizeof(CY));
+            break;
+        case VT_DATE:
+            memcpy(&out->u.date, in->u.pdate, sizeof(DATE));
+            break;
+        case VT_BSTR:
+            out->u.bstrVal = *in->u.pbstrVal;
+            break;
+        case VT_UNKNOWN:
+            out->u.punkVal = *in->u.ppunkVal;
+            break;
+        case VT_DISPATCH:
+            out->u.pdispVal = *in->u.ppdispVal;
+            break;
+        default:
+            return STG_E_INVALIDPARAMETER;
+    }
+
+    return S_OK;
+}
+
+/*
+ * Returns the buffer size needed to serialize the given property.
+ *
+ * This handles all straightforward cases, only crazy stuff like indirect
+ * properties have to be handled by the caller itself.
+ *
+ * TODO: Array handling
+ */
+HRESULT WINAPI PropertyStorage_SerializedPropertySize(const PROPVARIANT *in_prop,
+    ULONG *pcbSize, UINT diskCodepage, UINT runningCodepage)
+{
+    ULONG size = 4; /* the header */
+    HRESULT hr;
+    PROPVARIANT prop;
+
+    TRACE("(%p %p %u %u)\n", in_prop, pcbSize, diskCodepage, runningCodepage);
+
+    if (!in_prop)
+        return E_INVALIDARG;
+    if (!pcbSize)
+        return E_INVALIDARG;
+
+    *pcbSize = 0;
+
+    hr = ScrapeByRefOfProperty(in_prop, &prop);
+    if (FAILED(hr))
+        return hr;
+
+    switch (prop.vt)
+    {
+        case VT_EMPTY:
+        case VT_NULL:
+            break;
+        case VT_I1:
+        case VT_UI1:
+            size += 1;
+            break;
+        case VT_VECTOR|VT_I1:
+        case VT_VECTOR|VT_UI1:
+            size += 4; /* Vector Header */
+            size += prop.u.cac.cElems * 1;
+            break;
+        case VT_I2:
+        case VT_UI2:
+        case VT_BOOL:
+            size += 2;
+            break;
+        case VT_VECTOR|VT_I2:
+        case VT_VECTOR|VT_UI2:
+        case VT_VECTOR|VT_BOOL:
+            size += 4; /* Vector Header */
+            size += prop.u.cai.cElems * 2;
+            break;
+        case VT_UI4:
+        case VT_I4:
+        case VT_INT:
+        case VT_UINT:
+        case VT_ERROR:
+            size += 4;
+            break;
+        case VT_VECTOR|VT_UI4:
+        case VT_VECTOR|VT_I4:
+        case VT_VECTOR|VT_INT:
+        case VT_VECTOR|VT_UINT:
+        case VT_VECTOR|VT_ERROR:
+            size += 4; /* Vector Header */
+            size += prop.u.cal.cElems * 4;
+            break;
+        case VT_I8:
+        case VT_UI8:
+            size += 8;
+            break;
+        case VT_VECTOR|VT_I8:
+        case VT_VECTOR|VT_UI8:
+            size += 4; /* Vector header */
+            size += prop.u.cah.cElems * 8;
+            break;
+        case VT_LPSTR:
+        {
+            ULONG convertedLen;
+
+            size += 4; /* DWORD byte count */
+
+            hr = PropertyStorage_StringCopy_Size(prop.u.pszVal,
+                                                 runningCodepage,
+                                                 &convertedLen,
+                                                 diskCodepage);
+            if (FAILED(hr))
+                return hr;
+
+            size += convertedLen;
+
+            break;
+        }
+        case VT_VECTOR|VT_LPSTR:
+        {
+            ULONG i;
+
+            size += 4; /* Vector Header */
+            for (i = 0; i < prop.u.calpstr.cElems; ++i)
+            {
+                ULONG convertedLen;
+
+                size += 4; /* DWORD byte count */
+
+                hr = PropertyStorage_StringCopy_Size(prop.u.calpstr.pElems[i],
+                                                     runningCodepage,
+                                                     &convertedLen,
+                                                     diskCodepage);
+                if (FAILED(hr))
+                    return hr;
+
+                size += convertedLen;
+
+                size += (4 - (convertedLen % 4)) % 4; /* padding */
+            }
+            break;
+        }
+        case VT_BSTR:
+        {
+            /* bstrs are possibly saved as ansi string */
+            if (diskCodepage == CP_UNICODE)
+            {
+                ULONG len = 4; /* DWORD byte count */
+                len += SysStringLen(prop.u.bstrVal) * sizeof(WCHAR) + sizeof(WCHAR);
+                size += len;
+            }
+            else
+            {
+                UINT cw = SysStringLen(prop.u.bstrVal);
+
+                size += 4; /* DWORD byte count */
+                size += WideCharToMultiByte(diskCodepage, 0, prop.u.bstrVal, cw, NULL, 0, NULL, NULL);
+                size += 1; /* terminating null */
+            }
+
+            break;
+        }
+        case VT_VECTOR|VT_BSTR:
+        {
+            ULONG i;
+            size += 4; /* Vector Header */
+            for (i = 0; i < prop.u.cabstr.cElems; ++i)
+            {
+                ULONG len = 4; /* DWORD byte count */
+
+                /* bstrs are possibly saved as ansi string */
+                if (diskCodepage == CP_UNICODE)
+                {
+                    len += SysStringLen(prop.u.cabstr.pElems[i]) * sizeof(WCHAR) + sizeof(WCHAR);
+                }
+                else
+                {
+                    UINT cw = SysStringLen(prop.u.cabstr.pElems[i]);
+
+                    len += WideCharToMultiByte(diskCodepage, 0,
+                                prop.u.cabstr.pElems[i], cw, NULL, 0, NULL, NULL);
+                    len += 1; /* terminating null */
+                }
+
+                len += (4 - (len % 4)) % 4; /* padding */
+                size += len;
+            }
+            break;
+        }
+        case VT_BLOB:
+            size += 4; /* DWORD byte count */
+            size += prop.u.blob.cbSize;
+            break;
+        case VT_LPWSTR:
+            size += 4; /* DWORD char count */
+            size += (lstrlenW(prop.u.pwszVal) + 1) * sizeof(WCHAR);
+            break;
+        case VT_VECTOR|VT_LPWSTR:
+        {
+            ULONG i;
+            size += 4; /* Vector header */
+            for (i = 0; i < prop.u.calpwstr.cElems; ++i)
+            {
+                ULONG len = 4; /* DWORD char count */
+                len += (lstrlenW(prop.u.calpwstr.pElems[i]) + 1) * sizeof(WCHAR);
+                len += (4 - (len % 4)) % 4; /* padding */
+
+                size += len;
+            }
+            break;
+        }
+        case VT_FILETIME:
+        case VT_CY:
+            size += 8; /* 64bit integer */
+            break;
+        case VT_VECTOR|VT_FILETIME:
+        case VT_VECTOR|VT_CY:
+            size += 4; /* Vector header */
+            size += prop.u.cafiletime.cElems * 8;
+            break;
+        case VT_DATE:
+        case VT_R8:
+            size += 8; /* double */
+            break;
+        case VT_VECTOR|VT_DATE:
+        case VT_VECTOR|VT_R8:
+            size += 4; /* Vector header */
+            size += prop.u.cadbl.cElems * 8;
+            break;
+        case VT_R4:
+            size += 4; /* float */
+            break;
+        case VT_VECTOR|VT_R4:
+            size += 4; /* Vector header */
+            size += prop.u.caflt.cElems * 4;
+            break;
+        case VT_DECIMAL:
+            size += 16;
+            break;
+        case VT_CLSID:
+            size += sizeof(GUID);
+            break;
+        case VT_VECTOR|VT_CLSID:
+            size += 4; /* Vector header */
+            size += prop.u.cauuid.cElems * sizeof(GUID);
+            break;
+        case VT_CF:
+            size += 4; /* size field */
+            size += prop.u.pclipdata->cbSize; /* includes tag field */
+            break;
+        case VT_VECTOR|VT_CF:
+        {
+            ULONG i;
+
+            size += 4; /* Vector header */
+            for (i = 0; i < prop.u.caclipdata.cElems; ++i)
+            {
+                ULONG len = 4; /* DWORD size field */
+                len += prop.u.caclipdata.pElems[i].cbSize; /* includes tag field */
+                len += (4 - (len % 4)) % 4; /* padding */
 
-        StorageUtl_ReadDWord(ptr, 0, &propid);
-        ptr += sizeof(PROPID);
-        StorageUtl_ReadDWord(ptr, 0, &cbEntry);
-        ptr += sizeof(DWORD);
-        TRACE("Reading entry with ID 0x%08x, %d bytes\n", propid, cbEntry);
-        /* Make sure the source string is NULL-terminated */
-        if (This->codePage != CP_UNICODE)
-            ptr[cbEntry - 1] = '\0';
-        else
-            *((LPWSTR)ptr + cbEntry / sizeof(WCHAR)) = '\0';
-        hr = PropertyStorage_StoreNameWithId(This, (char*)ptr, This->codePage, propid);
-        if (This->codePage == CP_UNICODE)
+                size += len;
+            }
+            break;
+        }
+        case VT_VECTOR|VT_VARIANT:
         {
-            /* Unicode entries are padded to DWORD boundaries */
-            if (cbEntry % sizeof(DWORD))
-                ptr += sizeof(DWORD) - (cbEntry % sizeof(DWORD));
+            HRESULT hr;
+            ULONG vsize;
+            ULONG i;
+
+            size += 4; /* Vector header */
+            for (i = 0; i < prop.u.capropvar.cElems; ++i)
+            {
+                hr = PropertyStorage_SerializedPropertySize(&prop.u.capropvar.pElems[i],
+                                                            &vsize,
+                                                            diskCodepage, runningCodepage);
+                if (FAILED(hr))
+                    return hr;
+
+                size += vsize;
+                size += (4 - (vsize % 4)) % 4;
+            }
+            break;
         }
-        ptr += sizeof(DWORD) + cbEntry;
+        default:
+            FIXME("unsupported type %d\n", prop.vt);
+            return STG_E_INVALIDPARAMETER;
     }
-    return hr;
-}
 
-static void* WINAPI Allocate_CoTaskMemAlloc(void *this, ULONG size)
-{
-    return CoTaskMemAlloc(size);
+    /* always pad to 4 bytes */
+    size += (4 - (size % 4)) % 4;
+    *pcbSize = size;
+
+    return S_OK;
 }
 
-/* FIXME: there isn't any checking whether the read property extends past the
- * end of the buffer.
+/*
+ * Base implementation for serializing properties.
+ * Used by:
+ *      - IPropertyStorage
+ *      - StgConvertVariantToProperty
+ *      - StgSerializeProperty [propsys.dll]
+ *
+ * This handles all straightforward cases, only crazy stuff like indirect
+ * properties have to be handled by the caller itself.
+ *
+ * Codepages:
+ *      Serialized properties have no intrinsic knowledge of their codepage.
+ *      VT_LPSTR will be interpreted in the given $runningCodepage, and
+ *      VT_LPSTR and VT_BSTR will be converted to the given $diskCodepage.
+ *      $diskCodepage=CP_UNICODE is a sensible choice, but the OLE storage may
+ *      also use some ANSI codepage.
+ *      $runningCodepage=CP_ACP is the only sensible choice, but the current
+ *      storage implementation passes $runningCodepage=$diskCodepage and converts
+ *      narrow strings at a previous stage (TODO: change this).
+ *
+ * TODO: Array handling
  */
-static HRESULT PropertyStorage_ReadProperty(PROPVARIANT *prop, const BYTE *data,
-    UINT codepage, void* (WINAPI *allocate)(void *this, ULONG size), void *allocate_data)
+HRESULT WINAPI PropertyStorage_WritePropertyToBuffer(const PROPVARIANT *in_prop,
+                                                     BYTE *buffer,
+                                                     ULONG cbBufSize,
+                                                     ULONG *pcbBufSizeUsed,
+                                                     UINT diskCodepage,
+                                                     UINT runningCodepage)
 {
     HRESULT hr = S_OK;
+    ULONG cbBufSize_Start;
+    PROPVARIANT prop;
 
-    assert(prop);
-    assert(data);
-    StorageUtl_ReadDWord(data, 0, (DWORD *)&prop->vt);
-    data += sizeof(DWORD);
-    switch (prop->vt)
+    TRACE("(%p %p %u %p %u %u)\n", in_prop, buffer, cbBufSize,
+          pcbBufSizeUsed, diskCodepage, runningCodepage);
+
+    cbBufSize_Start = cbBufSize;
+
+    if (pcbBufSizeUsed)
+        *pcbBufSizeUsed = 0;
+
+    hr = ScrapeByRefOfProperty(in_prop, &prop);
+    if (FAILED(hr))
+        return hr;
+
+#define FAIL_IF_EOF(cbytes) \
+    do { \
+        if ((ULONG)cbytes > cbBufSize) \
+            return STG_E_INVALIDPARAMETER; \
+    } while (0)
+#define MOVE_FORWARD(bytes) \
+    do { \
+        FAIL_IF_EOF(bytes); \
+        buffer += bytes; \
+        cbBufSize -= bytes; \
+    } while (0)
+#define WRITE_WORD_AND_MOVE(value) \
+    do { \
+        FAIL_IF_EOF(2); \
+        StorageUtl_WriteWord(buffer, 0, (value)); \
+        MOVE_FORWARD(2); \
+    } while (0)
+#define WRITE_DWORD_AND_MOVE(value) \
+    do { \
+        FAIL_IF_EOF(4); \
+        StorageUtl_WriteDWord(buffer, 0, (value)); \
+        MOVE_FORWARD(4); \
+    } while (0)
+#define PAD_TO_MUL_AND_MOVE(cbLen, cbMul) \
+    do { \
+        FAIL_IF_EOF(((cbMul) - ((cbLen) % (cbMul))) % (cbMul)); \
+        ZeroMemory(buffer, ((cbMul) - ((cbLen) % (cbMul))) % (cbMul)); \
+        MOVE_FORWARD(((cbMul) - ((cbLen) % (cbMul))) % (cbMul)); \
+    } while(0)
+#define FOR_POSSIBLE_VECTOR(ctype, singleMember, vectorMember, cbBlock) \
+    const ctype *vec; \
+    DWORD vecsize; \
+    if (!(prop.vt & VT_VECTOR)) \
+    { \
+        vecsize = 1; \
+        vec = &prop.u.singleMember; \
+    } \
+    else \
+    { \
+        vecsize = prop.u.vectorMember.cElems; \
+        WRITE_DWORD_AND_MOVE(vecsize); \
+        vec = prop.u.vectorMember.pElems; \
+    } \
+    for (; vecsize; --vecsize, ++vec, buffer += (cbBlock), cbBufSize -= (cbBlock)) \
+        if (gt((ULONG)(cbBlock), cbBufSize)) \
+            return STG_E_INVALIDPARAMETER; \
+        else
+
+#define FOR_POSSIBLE_VECTOR_OR_SINGLEP(ctype, singleMemberP, vectorMember, cbBlock) \
+    const ctype *vec; \
+    DWORD vecsize; \
+    if (!(prop.vt & VT_VECTOR)) \
+    { \
+        vecsize = 1; \
+        vec = prop.u.singleMemberP; \
+    } \
+    else \
+    { \
+        vecsize = prop.u.vectorMember.cElems; \
+        WRITE_DWORD_AND_MOVE(vecsize); \
+        vec = prop.u.vectorMember.pElems; \
+    } \
+    for (; vecsize; --vecsize, ++vec, buffer += (cbBlock), cbBufSize -= (cbBlock)) \
+        if (gt((ULONG)(cbBlock), cbBufSize)) \
+            return STG_E_INVALIDPARAMETER; \
+        else
+
+#define CASE_OR_VECTOR(vtype) \
+    case vtype: \
+    case VT_VECTOR|vtype:
+
+    assert(buffer);
+
+    TRACE("Serializing variant of type %d to buffer size %lu\n", prop.vt, (unsigned long)cbBufSize);
+
+    /* variant type */
+    WRITE_DWORD_AND_MOVE((DWORD)prop.vt);
+
+    switch (prop.vt)
     {
     case VT_EMPTY:
     case VT_NULL:
         break;
-    case VT_I1:
-        prop->u.cVal = *(const char *)data;
-        TRACE("Read char 0x%x ('%c')\n", prop->u.cVal, prop->u.cVal);
-        break;
-    case VT_UI1:
-        prop->u.bVal = *data;
-        TRACE("Read byte 0x%x\n", prop->u.bVal);
+    CASE_OR_VECTOR(VT_I1)
+    {
+        FOR_POSSIBLE_VECTOR(char, cVal, cac, 1)
+        {
+            *(char *)buffer = *vec;
+            TRACE("Write char 0x%x ('%c')\n", vec[0], vec[0]);
+        }
         break;
-    case VT_I2:
-        StorageUtl_ReadWord(data, 0, (WORD*)&prop->u.iVal);
-        TRACE("Read short %d\n", prop->u.iVal);
+    }
+    CASE_OR_VECTOR(VT_UI1)
+    {
+        FOR_POSSIBLE_VECTOR(BYTE, bVal, caub, 1)
+        {
+            *buffer = *vec;
+            TRACE("Write byte 0x%x\n", *vec);
+        }
         break;
-    case VT_UI2:
-        StorageUtl_ReadWord(data, 0, &prop->u.uiVal);
-        TRACE("Read ushort %d\n", prop->u.uiVal);
+    }
+    CASE_OR_VECTOR(VT_I2)
+    {
+        FOR_POSSIBLE_VECTOR(SHORT, iVal, cai, 2)
+        {
+            StorageUtl_WriteWord(buffer, 0, *(WORD*)vec);
+            TRACE("Write short %d\n", (int)*vec);
+        }
         break;
-    case VT_INT:
-    case VT_I4:
-        StorageUtl_ReadDWord(data, 0, (DWORD*)&prop->u.lVal);
-        TRACE("Read long %d\n", prop->u.lVal);
+    }
+    CASE_OR_VECTOR(VT_UI2)
+    CASE_OR_VECTOR(VT_BOOL) /* VARIANT_BOOL == USHORT */
+    {
+        FOR_POSSIBLE_VECTOR(USHORT, uiVal, caui, 2)
+        {
+            StorageUtl_WriteWord(buffer, 0, *vec);
+            TRACE("Write ushort %d\n", (int)*vec);
+        }
         break;
-    case VT_UINT:
-    case VT_UI4:
-        StorageUtl_ReadDWord(data, 0, &prop->u.ulVal);
-        TRACE("Read ulong %d\n", prop->u.ulVal);
+    }
+    CASE_OR_VECTOR(VT_INT)
+    CASE_OR_VECTOR(VT_I4)
+    CASE_OR_VECTOR(VT_ERROR) /* SCODE == LONG */
+    {
+        FOR_POSSIBLE_VECTOR(LONG, lVal, cal, 4)
+        {
+            StorageUtl_WriteDWord(buffer, 0, *(DWORD*)vec);
+            TRACE("Write long %d\n", *vec);
+        }
         break;
-    case VT_LPSTR:
+    }
+    CASE_OR_VECTOR(VT_UINT)
+    CASE_OR_VECTOR(VT_UI4)
     {
-        DWORD count;
-       
-        StorageUtl_ReadDWord(data, 0, &count);
-        if (codepage == CP_UNICODE && count % 2)
+        FOR_POSSIBLE_VECTOR(ULONG, ulVal, caul, 4)
         {
-            WARN("Unicode string has odd number of bytes\n");
-            hr = STG_E_INVALIDHEADER;
+            StorageUtl_WriteDWord(buffer, 0, *vec);
+            TRACE("Write ulong %u\n", *vec);
         }
-        else
+        break;
+    }
+    CASE_OR_VECTOR(VT_I8)
+    {
+        FOR_POSSIBLE_VECTOR(LARGE_INTEGER, hVal, cah, 8)
         {
-            prop->u.pszVal = allocate(allocate_data, count);
-            if (prop->u.pszVal)
-            {
-                memcpy(prop->u.pszVal, data + sizeof(DWORD), count);
-                /* This is stored in the code page specified in codepage.
-                 * Don't convert it, the caller will just store it as-is.
-                 */
-                if (codepage == CP_UNICODE)
-                {
-                    /* Make sure it's NULL-terminated */
-                    prop->u.pszVal[count / sizeof(WCHAR) - 1] = '\0';
-                    TRACE("Read string value %s\n",
-                     debugstr_w(prop->u.pwszVal));
-                }
-                else
-                {
-                    /* Make sure it's NULL-terminated */
-                    prop->u.pszVal[count - 1] = '\0';
-                    TRACE("Read string value %s\n", debugstr_a(prop->u.pszVal));
-                }
-            }
-            else
-                hr = STG_E_INSUFFICIENTMEMORY;
+            StorageUtl_WriteULargeInteger(buffer, 0, (ULARGE_INTEGER*)vec);
+            TRACE("Write longlong 0x%lx%08lx\n", (unsigned long)vec->HighPart, (unsigned long)vec->LowPart);
         }
         break;
     }
-    case VT_BSTR:
+    CASE_OR_VECTOR(VT_UI8)
     {
-        DWORD count, wcount;
-
-        StorageUtl_ReadDWord(data, 0, &count);
-        if (codepage == CP_UNICODE && count % 2)
+        FOR_POSSIBLE_VECTOR(ULARGE_INTEGER, uhVal, cauh, 8)
         {
-            WARN("Unicode string has odd number of bytes\n");
-            hr = STG_E_INVALIDHEADER;
+            StorageUtl_WriteULargeInteger(buffer, 0, vec);
+            TRACE("Write ulonglong 0x%lx%08lx\n", (unsigned long)vec->HighPart, (unsigned long)vec->LowPart);
         }
-        else
+        break;
+    }
+    CASE_OR_VECTOR(VT_LPSTR)
+    {
+        FOR_POSSIBLE_VECTOR(LPSTR, pszVal, calpstr, 0)
         {
-            if (codepage == CP_UNICODE)
-                wcount = count / 2;
+            DWORD convertedLen;
+
+            hr = PropertyStorage_StringCopy_Size(*vec,
+                                                 runningCodepage,
+                                                 &convertedLen,
+                                                 diskCodepage);
+            if (FAILED(hr))
+                return hr;
+
+            WRITE_DWORD_AND_MOVE(convertedLen);
+            FAIL_IF_EOF(convertedLen);
+
+            hr = PropertyStorage_StringCopy_Buffer(*vec,
+                                                   runningCodepage,
+                                                   (char*)buffer, convertedLen,
+                                                   diskCodepage);
+            if (FAILED(hr))
+                return hr;
+
+            if (diskCodepage == CP_UNICODE)
+            {
+                PropertyStorage_ByteSwapString(buffer, convertedLen/2);
+                TRACE("Write lpstr %s\n", debugstr_w((LPCWSTR)buffer));
+            }
             else
-                wcount = MultiByteToWideChar(codepage, 0, (LPCSTR)(data + sizeof(DWORD)), count, NULL, 0);
+            {
+                TRACE("Write lpstr %s\n", debugstr_a((char*)buffer));
+            }
 
-            prop->u.bstrVal = SysAllocStringLen(NULL, wcount); /* FIXME: use allocator? */
+            MOVE_FORWARD(convertedLen);
+            PAD_TO_MUL_AND_MOVE(convertedLen, 4);
+        }
+        break;
+    }
+    CASE_OR_VECTOR(VT_BSTR)
+    {
+        FOR_POSSIBLE_VECTOR(BSTR, bstrVal, cabstr, 0)
+        {
+            /* BSTRs are saved in the codepage */
+            DWORD len = SysStringLen(*vec) + 1;
 
-            if (prop->u.bstrVal)
+            if (diskCodepage == CP_UNICODE)
             {
-                if (codepage == CP_UNICODE)
-                    memcpy(prop->u.bstrVal, data + sizeof(DWORD), count);
-                else
-                    MultiByteToWideChar(codepage, 0, (LPCSTR)(data + sizeof(DWORD)), count, prop->u.bstrVal, wcount);
+                WRITE_DWORD_AND_MOVE(len * sizeof(WCHAR));
 
-                prop->u.bstrVal[wcount - 1] = '\0';
-                TRACE("Read string value %s\n", debugstr_w(prop->u.bstrVal));
+                FAIL_IF_EOF(len * sizeof(WCHAR));
+                memcpy(buffer, *vec, len * sizeof(WCHAR));
+                PropertyStorage_ByteSwapString(buffer, len);
+                MOVE_FORWARD(len * sizeof(WCHAR));
+                PAD_TO_MUL_AND_MOVE(len * sizeof(WCHAR), 4);
             }
             else
-                hr = STG_E_INSUFFICIENTMEMORY;
+            {
+                DWORD narrowLen;
+
+                narrowLen = WideCharToMultiByte(diskCodepage, 0, *vec, len, NULL, 0, NULL, NULL);
+
+                WRITE_DWORD_AND_MOVE(narrowLen);
+
+                FAIL_IF_EOF(narrowLen);
+                WideCharToMultiByte(diskCodepage, 0, *vec, len, (char*)buffer, narrowLen, NULL, NULL);
+                MOVE_FORWARD(narrowLen);
+                PAD_TO_MUL_AND_MOVE(narrowLen, 4);
+            }
+            TRACE("Write BSTR %s\n", debugstr_w(*vec));
         }
         break;
     }
     case VT_BLOB:
     {
-        DWORD count;
+        WRITE_DWORD_AND_MOVE(prop.u.blob.cbSize);
+        FAIL_IF_EOF(prop.u.blob.cbSize);
+        memcpy(buffer, prop.u.blob.pBlobData, prop.u.blob.cbSize);
+        MOVE_FORWARD(prop.u.blob.cbSize);
+        PAD_TO_MUL_AND_MOVE(prop.u.blob.cbSize, 4);
 
-        StorageUtl_ReadDWord(data, 0, &count);
-        prop->u.blob.cbSize = count;
-        prop->u.blob.pBlobData = allocate(allocate_data, count);
-        if (prop->u.blob.pBlobData)
+        TRACE("Write blob value of size %d\n", prop.u.blob.cbSize);
+        break;
+    }
+    CASE_OR_VECTOR(VT_LPWSTR)
+    {
+        FOR_POSSIBLE_VECTOR(LPWSTR, pwszVal, calpwstr, 0)
         {
-            memcpy(prop->u.blob.pBlobData, data + sizeof(DWORD), count);
-            TRACE("Read blob value of size %d\n", count);
+            DWORD len;
+
+            len = lstrlenW((LPCWSTR)*vec) + 1;
+            WRITE_DWORD_AND_MOVE(len);
+
+            FAIL_IF_EOF(len * sizeof(WCHAR));
+            memcpy(buffer, *vec, len * sizeof(WCHAR));
+            PropertyStorage_ByteSwapString(buffer, len);
+            MOVE_FORWARD(len * sizeof(WCHAR));
+            PAD_TO_MUL_AND_MOVE(len * sizeof(WCHAR), 4);
+            TRACE("Write lpwstr %s\n", debugstr_w(*vec));
         }
-        else
-            hr = STG_E_INSUFFICIENTMEMORY;
         break;
     }
-    case VT_LPWSTR:
+    CASE_OR_VECTOR(VT_FILETIME)
     {
-        DWORD count;
+        ULARGE_INTEGER tmp;
+        FOR_POSSIBLE_VECTOR(FILETIME, filetime, cafiletime, 8)
+        {
+            tmp.LowPart  = vec->dwLowDateTime;
+            tmp.HighPart = vec->dwHighDateTime;
 
-        StorageUtl_ReadDWord(data, 0, &count);
-        prop->u.pwszVal = allocate(allocate_data, count * sizeof(WCHAR));
-        if (prop->u.pwszVal)
+            StorageUtl_WriteULargeInteger(buffer, 0, &tmp);
+        }
+        break;
+    }
+    CASE_OR_VECTOR(VT_CY)
+    {
+        ULARGE_INTEGER tmp;
+        FOR_POSSIBLE_VECTOR(CY, cyVal, cacy, 8)
         {
-            memcpy(prop->u.pwszVal, data + sizeof(DWORD),
-             count * sizeof(WCHAR));
-            /* make sure string is NULL-terminated */
-            prop->u.pwszVal[count - 1] = '\0';
-            PropertyStorage_ByteSwapString(prop->u.pwszVal, count);
-            TRACE("Read string value %s\n", debugstr_w(prop->u.pwszVal));
+            *((LONGLONG*)&tmp.QuadPart) = vec->int64;
+            StorageUtl_WriteULargeInteger(buffer, 0, &tmp);
+        }
+        break;
+    }
+    CASE_OR_VECTOR(VT_CF)
+    {
+        FOR_POSSIBLE_VECTOR_OR_SINGLEP(CLIPDATA, pclipdata, caclipdata, 0)
+        {
+            WRITE_DWORD_AND_MOVE(vec->cbSize);
+            WRITE_DWORD_AND_MOVE(vec->ulClipFmt);
+
+            FAIL_IF_EOF(vec->cbSize - 4);
+            memcpy(buffer, vec->pClipData, vec->cbSize - 4);
+            MOVE_FORWARD(vec->cbSize - 4);
+
+            PAD_TO_MUL_AND_MOVE(vec->cbSize, 4);
+            TRACE("Written CLPIDATA with size %lu\n", (unsigned long)vec->cbSize);
         }
-        else
-            hr = STG_E_INSUFFICIENTMEMORY;
         break;
     }
-    case VT_FILETIME:
-        StorageUtl_ReadULargeInteger(data, 0,
-         (ULARGE_INTEGER *)&prop->u.filetime);
+    CASE_OR_VECTOR(VT_DATE)
+    CASE_OR_VECTOR(VT_R8)
+    {
+        FOR_POSSIBLE_VECTOR(double, dblVal, cadbl, sizeof(double))
+        {
+            memcpy(buffer, vec, sizeof(double));
+        }
         break;
-    case VT_CF:
+    }
+    CASE_OR_VECTOR(VT_R4)
+    {
+        FOR_POSSIBLE_VECTOR(float, fltVal, caflt, sizeof(float))
         {
-            DWORD len = 0, tag = 0;
+            memcpy(buffer, vec, sizeof(float));
+        }
+        break;
+    }
+    case VT_DECIMAL:
+    {
+        DECIMAL *dec;
+
+        FAIL_IF_EOF(16);
 
-            StorageUtl_ReadDWord(data, 0, &len);
-            StorageUtl_ReadDWord(data, 4, &tag);
-            if (len > 8)
+        dec = (DECIMAL*)∝
+        buffer[0] = 0;
+        buffer[1] = 0;
+        buffer[2] = dec->u.scale;
+        buffer[3] = dec->u.sign;
+        StorageUtl_WriteDWord(buffer, 4, dec->Hi32);
+        StorageUtl_WriteULargeInteger(buffer, 8, (ULARGE_INTEGER*)&dec->u1);
+
+        MOVE_FORWARD(16);
+        break;
+    }
+    CASE_OR_VECTOR(VT_CLSID)
+    {
+        FOR_POSSIBLE_VECTOR_OR_SINGLEP(GUID, puuid, cauuid, 16)
+        {
+            StorageUtl_WriteGUID(buffer, 0, vec);
+        }
+        break;
+    }
+    case VT_VECTOR|VT_VARIANT:
+    {
+        FOR_POSSIBLE_VECTOR_OR_SINGLEP(PROPVARIANT, /* dummy */pvarVal, capropvar, 0)
+        {
+            ULONG cbBufferUsed;
+            hr = PropertyStorage_WritePropertyToBuffer(
+                    vec, buffer, cbBufSize, &cbBufferUsed, diskCodepage, runningCodepage);
+            if (FAILED(hr))
             {
-                len -= 8;
-                prop->u.pclipdata = allocate(allocate_data, sizeof (CLIPDATA));
-                prop->u.pclipdata->cbSize = len;
-                prop->u.pclipdata->ulClipFmt = tag;
-                prop->u.pclipdata->pClipData = allocate(allocate_data, len - sizeof(prop->u.pclipdata->ulClipFmt));
-                memcpy(prop->u.pclipdata->pClipData, data+8, len - sizeof(prop->u.pclipdata->ulClipFmt));
+                return hr;
             }
-            else
-                hr = STG_E_INVALIDPARAMETER;
+
+            buffer += cbBufferUsed;
+            cbBufSize -= cbBufferUsed;
         }
         break;
+    }
     default:
-        FIXME("unsupported type %d\n", prop->vt);
-        hr = STG_E_INVALIDPARAMETER;
+        FIXME("unsupported type %d\n", prop.vt);
+        return STG_E_INVALIDPARAMETER;
     }
+
+    /* Pad to 4 bytes. Always. */
+    PAD_TO_MUL_AND_MOVE(cbBufSize_Start - cbBufSize, 4);
+
+    if (pcbBufSizeUsed)
+        *pcbBufSizeUsed = cbBufSize_Start - cbBufSize;
+
+#undef FAIL_IF_EOF
+#undef WRITE_DWORD_AND_MOVE
+#undef WRITE_WORD_AND_MOVE
+#undef MOVE_FORWARD
+#undef FOR_POSSIBLE_VECTOR
+#undef FOR_POSSIBLE_VECTOR_OR_SINGLEP
+#undef PAD_TO_MUL_AND_MOVE
+#undef CASE_OR_VECTOR
+
     return hr;
 }
 
@@ -1439,11 +2653,14 @@ static HRESULT PropertyStorage_ReadFromStream(PropertyStorage_impl *This)
             else
             {
                 PROPVARIANT prop;
+                HRESULT hr;
 
                 PropVariantInit(&prop);
-                if (SUCCEEDED(PropertyStorage_ReadProperty(&prop,
-                 buf + idOffset->dwOffset - sizeof(PROPERTYSECTIONHEADER),
-                 This->codePage, Allocate_CoTaskMemAlloc, NULL)))
+                hr = PropertyStorage_ReadProperty(&prop,
+                        buf + idOffset->dwOffset - sizeof(PROPERTYSECTIONHEADER),
+                        sectionHdr.cbSection - idOffset->dwOffset,
+                        NULL, This->codePage, This->codePage, NULL, NULL);
+                if (SUCCEEDED(hr))
                 {
                     TRACE("Read property with ID 0x%08x, type %d\n",
                      idOffset->propid, prop.vt);
@@ -1468,6 +2685,11 @@ static HRESULT PropertyStorage_ReadFromStream(PropertyStorage_impl *This)
                          idOffset->propid, &prop, This->codePage);
                     }
                 }
+                else
+                {
+                    WARN("Failed to read property with ID 0x%08x, hr=0x%08x\n",
+                         idOffset->propid, hr);
+                }
                 PropVariantClear(&prop);
             }
         }
@@ -1689,7 +2911,9 @@ static HRESULT PropertyStorage_WritePropertyToStream(PropertyStorage_impl *This,
     LARGE_INTEGER seek;
     PROPERTYIDOFFSET propIdOffset;
     ULONG count;
-    DWORD dwType, bytesWritten;
+    DWORD bytesWritten;
+    BYTE *propBuffer = NULL;
+    ULONG bufferUsed = 0;
 
     assert(var);
     assert(sectionOffset);
@@ -1711,112 +2935,33 @@ static HRESULT PropertyStorage_WritePropertyToStream(PropertyStorage_impl *This,
     hr = IStream_Seek(This->stm, seek, STREAM_SEEK_SET, NULL);
     if (FAILED(hr))
         goto end;
-    StorageUtl_WriteDWord((LPBYTE)&dwType, 0, var->vt);
-    hr = IStream_Write(This->stm, &dwType, sizeof(dwType), &count);
-    if (FAILED(hr))
-        goto end;
-    *sectionOffset += sizeof(dwType);
 
-    switch (var->vt)
-    {
-    case VT_EMPTY:
-    case VT_NULL:
-        bytesWritten = 0;
-        break;
-    case VT_I1:
-    case VT_UI1:
-        hr = IStream_Write(This->stm, &var->u.cVal, sizeof(var->u.cVal),
-         &count);
-        bytesWritten = count;
-        break;
-    case VT_I2:
-    case VT_UI2:
+    hr = PropertyStorage_SerializedPropertySize(var, &count, This->codePage, This->codePage);
+    if (FAILED(hr))
     {
-        WORD wTemp;
-
-        StorageUtl_WriteWord((LPBYTE)&wTemp, 0, var->u.iVal);
-        hr = IStream_Write(This->stm, &wTemp, sizeof(wTemp), &count);
-        bytesWritten = count;
-        break;
+        WARN("Property space could not be calculated: hr=%08x\n", hr);
+        goto end;
     }
-    case VT_I4:
-    case VT_UI4:
-    {
-        DWORD dwTemp;
 
-        StorageUtl_WriteDWord((LPBYTE)&dwTemp, 0, var->u.lVal);
-        hr = IStream_Write(This->stm, &dwTemp, sizeof(dwTemp), &count);
-        bytesWritten = count;
-        break;
-    }
-    case VT_LPSTR:
+    propBuffer = CoTaskMemAlloc(count);
+    if (!propBuffer)
     {
-        DWORD len, dwTemp;
-
-        if (This->codePage == CP_UNICODE)
-            len = (lstrlenW(var->u.pwszVal) + 1) * sizeof(WCHAR);
-        else
-            len = lstrlenA(var->u.pszVal) + 1;
-        StorageUtl_WriteDWord((LPBYTE)&dwTemp, 0, len);
-        hr = IStream_Write(This->stm, &dwTemp, sizeof(dwTemp), &count);
-        if (FAILED(hr))
-            goto end;
-        hr = IStream_Write(This->stm, var->u.pszVal, len, &count);
-        bytesWritten = count + sizeof(DWORD);
-        break;
+        hr = STG_E_INSUFFICIENTMEMORY;
+        goto end;
     }
-    case VT_LPWSTR:
-    {
-        DWORD len = lstrlenW(var->u.pwszVal) + 1, dwTemp;
 
-        StorageUtl_WriteDWord((LPBYTE)&dwTemp, 0, len);
-        hr = IStream_Write(This->stm, &dwTemp, sizeof(dwTemp), &count);
-        if (FAILED(hr))
-            goto end;
-        hr = IStream_Write(This->stm, var->u.pwszVal, len * sizeof(WCHAR),
-         &count);
-        bytesWritten = count + sizeof(DWORD);
-        break;
-    }
-    case VT_FILETIME:
+    hr = PropertyStorage_WritePropertyToBuffer(var, propBuffer, count, &bufferUsed, This->codePage, This->codePage);
+    if (SUCCEEDED(hr))
     {
-        FILETIME temp;
+        if (bufferUsed != count)
+            WARN("Property buffer calculation was off by %d bytes\n", (int)(count - bufferUsed));
 
-        StorageUtl_WriteULargeInteger((BYTE *)&temp, 0,
-         (const ULARGE_INTEGER *)&var->u.filetime);
-        hr = IStream_Write(This->stm, &temp, sizeof(FILETIME), &count);
+        hr = IStream_Write(This->stm, propBuffer, bufferUsed, &count);
         bytesWritten = count;
-        break;
-    }
-    case VT_CF:
-    {
-        DWORD cf_hdr[2], len;
-
-        len = var->u.pclipdata->cbSize;
-        StorageUtl_WriteDWord((LPBYTE)&cf_hdr[0], 0, len + 8);
-        StorageUtl_WriteDWord((LPBYTE)&cf_hdr[1], 0, var->u.pclipdata->ulClipFmt);
-        hr = IStream_Write(This->stm, cf_hdr, sizeof(cf_hdr), &count);
-        if (FAILED(hr))
-            goto end;
-        hr = IStream_Write(This->stm, var->u.pclipdata->pClipData,
-                           len - sizeof(var->u.pclipdata->ulClipFmt), &count);
-        if (FAILED(hr))
-            goto end;
-        bytesWritten = count + sizeof cf_hdr;
-        break;
     }
-    case VT_CLSID:
+    else
     {
-        CLSID temp;
-
-        StorageUtl_WriteGUID((BYTE *)&temp, 0, var->u.puuid);
-        hr = IStream_Write(This->stm, &temp, sizeof(temp), &count);
-        bytesWritten = count;
-        break;
-    }
-    default:
-        FIXME("unsupported type: %d\n", var->vt);
-        return STG_E_INVALIDPARAMETER;
+        WARN("Property could not be written: hr=%08x\n", hr);
     }
 
     if (SUCCEEDED(hr))
@@ -2748,12 +3893,17 @@ BOOLEAN WINAPI StgConvertPropertyToVariant(const SERIALIZEDPROPERTYVALUE* prop,
 {
     HRESULT hr;
 
-    hr = PropertyStorage_ReadProperty(pvar, (const BYTE*)prop, CodePage, Allocate_PMemoryAllocator, pma);
+    hr = PropertyStorage_ReadProperty(pvar, (const BYTE*)prop, /*FIXME*/0xFFFFFFFF, NULL,
+                           CodePage, CP_ACP, Allocate_PMemoryAllocator, pma);
 
     if (FAILED(hr))
     {
-        FIXME("should raise C++ exception on failure\n");
+        /* FIXME: can't clear partially initialized PROPVARIANT because
+         *        PropVariantClear can't deal with a custom Free function */
         PropVariantInit(pvar);
+
+        /* TODO: get the HRESULT<->NTSTATUS mapping right */
+        RaiseException(0xC000000D /*STATUS_INVALID_PARAMETER*/, 0, 0, NULL);
     }
 
     return FALSE;
@@ -2763,7 +3913,32 @@ SERIALIZEDPROPERTYVALUE* WINAPI StgConvertVariantToProperty(const PROPVARIANT *p
     USHORT CodePage, SERIALIZEDPROPERTYVALUE *pprop, ULONG *pcb, PROPID pid,
     BOOLEAN fReserved, ULONG *pcIndirect)
 {
-    FIXME("%p,%d,%p,%p,%d,%d,%p\n", pvar, CodePage, pprop, pcb, pid, fReserved, pcIndirect);
+    HRESULT hr;
+    ULONG buffer_size;
+
+    TRACE("%p,%d,%p,%p,%d,%d,%p\n", pvar, CodePage, pprop, pcb, pid, fReserved, pcIndirect);
+
+    if (pprop && pcb)
+        buffer_size = *pcb;
+    else
+        buffer_size = (ULONG)-1;
+
+    /* TODO: indirect properties and other crazyness */
+    if (pprop)
+    {
+        hr = PropertyStorage_WritePropertyToBuffer(pvar, (BYTE*)pprop, buffer_size, pcb, CodePage, CP_ACP);
+    }
+    else
+    {
+        hr = PropertyStorage_SerializedPropertySize(pvar, pcb, CodePage, CP_ACP);
+    }
+
+    if (FAILED(hr))
+    {
+        /* FIXME: what should we really do? I couldn't get windows to actually throw an exception */
+        FIXME("should raise exception on failure\n");
+        return NULL;
+    }
 
-    return NULL;
+    return pprop;
 }
diff --git a/dlls/ole32/tests/propvariant.c b/dlls/ole32/tests/propvariant.c
index c45ca2a..401bc27 100644
--- a/dlls/ole32/tests/propvariant.c
+++ b/dlls/ole32/tests/propvariant.c
@@ -23,6 +23,7 @@
 #include "ddeml.h"
 
 #include "wine/test.h"
+#include "wine/exception.h"
 
 /* invalid in all versions */
 #define PROP_INV 0x7f
@@ -438,6 +439,30 @@ static const char serialized_bstr_mb[] = {
     0,0,0,0
 };
 
+static const char serialized_ascii_str_wc[] = {
+    30,0, /* VT_LPSTR */
+    0,0, /* padding */
+    10,0,0,0, /* size */
+    't',0,'e',0,
+    's',0,'t',0,
+    0,0,0,0
+};
+
+static const char serialized_ascii_str_mb[] = {
+    30,0, /* VT_LPSTR */
+    0,0, /* padding */
+    5,0,0,0, /* size */
+    't','e','s','t',
+    0,0,0,0
+};
+
+static const char serialized_invalid[] = {
+    0xde, 0xad, /* invalid */
+    0, 0,
+    'b','o','g','u','s',
+    0,0,0
+};
+
 static void test_propertytovariant(void)
 {
     HANDLE hole32;
@@ -447,6 +472,7 @@ static void test_propertytovariant(void)
     struct _PMemoryAllocator_vtable vtable;
     BOOLEAN ret;
     static const WCHAR test_string[] = {'t','e','s','t',0};
+    static const char test_astring[] = "test";
 
     hole32 = GetModuleHandleA("ole32");
 
@@ -495,6 +521,36 @@ static void test_propertytovariant(void)
     ok(propvar.vt == VT_BSTR, "unexpected vt %x\n", propvar.vt);
     ok(!lstrcmpW(U(propvar).bstrVal, test_string), "unexpected string value\n");
     PropVariantClear(&propvar);
+
+    ret = pStgConvertPropertyToVariant((SERIALIZEDPROPERTYVALUE*)serialized_ascii_str_wc,
+        CP_WINUNICODE, &propvar, &allocator);
+
+    ok(ret == 0, "StgConvertPropertyToVariant returned %i\n", ret);
+    ok(propvar.vt == VT_LPSTR, "unexpected vt %x\n", propvar.vt);
+    ok(!lstrcmpA(U(propvar).pszVal, test_astring), "unexpected string value '%s'\n", U(propvar).pszVal);
+    PropVariantClear(&propvar);
+
+    ret = pStgConvertPropertyToVariant((SERIALIZEDPROPERTYVALUE*)serialized_ascii_str_mb,
+        CP_UTF8, &propvar, &allocator);
+
+    ok(ret == 0, "StgConvertPropertyToVariant returned %i\n", ret);
+    ok(propvar.vt == VT_LPSTR, "unexpected vt %x\n", propvar.vt);
+    ok(!lstrcmpA(U(propvar).pszVal, test_astring), "unexpected string value '%s'\n", U(propvar).pszVal);
+    PropVariantClear(&propvar);
+
+    /* provoke exceptions */
+    __TRY
+    {
+        ret = pStgConvertPropertyToVariant((SERIALIZEDPROPERTYVALUE*)serialized_invalid,
+                                        CP_WINUNICODE, &propvar, &allocator);
+        ok(0, "StgConvertPropertyToVariant should have thrown\n");
+    }
+    __EXCEPT_ALL
+    {
+        todo_wine ok(GetExceptionCode() == 0xC00000bb/*STATUS_NOT_SUPPORTED*/,
+           "StgConvertPropertyToVariant threw unexpected exception %x\n", GetExceptionCode());
+    }
+    __ENDTRY;
 }
 
 static void test_varianttoproperty(void)
@@ -506,6 +562,7 @@ static void test_varianttoproperty(void)
         const PROPVARIANT*,USHORT,SERIALIZEDPROPERTYVALUE*,ULONG*,PROPID,BOOLEAN,ULONG*);
     ULONG len;
     static const WCHAR test_string[] = {'t','e','s','t',0};
+    static char test_astring[] = "test";
     BSTR test_string_bstr;
 
     hole32 = GetModuleHandleA("ole32");
@@ -530,7 +587,7 @@ static void test_varianttoproperty(void)
         0, FALSE, 0);
 
     ok(propvalue == NULL, "got nonnull propvalue\n");
-    todo_wine ok(len == 8, "unexpected length %d\n", len);
+    ok(len == 8, "unexpected length %d\n", len);
 
     if (len == 0xdeadbeef)
     {
@@ -538,6 +595,15 @@ static void test_varianttoproperty(void)
         return;
     }
 
+    len = 4; /* too small! */
+    own_propvalue->dwType = 0xcafebabe;
+    propvalue = pStgConvertVariantToProperty(&propvar, CP_WINUNICODE,
+                                                    own_propvalue, &len, 0, FALSE, 0);
+    ok(NULL == propvalue, "unexpected propvalue %p\n", propvalue);
+    todo_wine ok(len == 8, "unexpected length %d\n", len);
+
+    /*TODO: how can we make it throw an exception? */
+
     len = 20;
     propvalue = pStgConvertVariantToProperty(&propvar, CP_WINUNICODE, own_propvalue, &len,
         0, FALSE, 0);
@@ -588,6 +654,24 @@ static void test_varianttoproperty(void)
 
     SysFreeString(test_string_bstr);
 
+    propvar.vt = VT_LPSTR;
+    U(propvar).pszVal = test_astring;
+    len = 20;
+    propvalue = pStgConvertVariantToProperty(&propvar, CP_WINUNICODE, own_propvalue, &len,
+        0, FALSE, 0);
+
+    ok(propvalue == own_propvalue, "unexpected propvalue %p\n", propvalue);
+    ok(len == 20, "unexpected length %d\n", len);
+    ok(!memcmp(propvalue, serialized_ascii_str_wc, 20), "got wrong data\n");
+
+    len = 20;
+    propvalue = pStgConvertVariantToProperty(&propvar, CP_UTF8, own_propvalue, &len,
+        0, FALSE, 0);
+
+    ok(propvalue == own_propvalue, "unexpected propvalue %p\n", propvalue);
+    ok(len == 16, "unexpected length %d\n", len);
+    ok(!memcmp(propvalue, serialized_ascii_str_mb, 16), "got wrong data\n");
+
     HeapFree(GetProcessHeap(), 0, own_propvalue);
 }
 
diff --git a/include/propidl.idl b/include/propidl.idl
index 2fb8370..5905694 100644
--- a/include/propidl.idl
+++ b/include/propidl.idl
@@ -443,6 +443,8 @@ typedef struct SERIALIZEDPROPERTYVALUE {
 cpp_quote("HRESULT WINAPI FreePropVariantArray(ULONG,PROPVARIANT*);")
 cpp_quote("HRESULT WINAPI PropVariantClear(PROPVARIANT*);")
 cpp_quote("HRESULT WINAPI PropVariantCopy(PROPVARIANT*,const PROPVARIANT*);")
+cpp_quote("SERIALIZEDPROPERTYVALUE* WINAPI StgConvertVariantToProperty(const PROPVARIANT *pvar, USHORT CodePage, SERIALIZEDPROPERTYVALUE *pprop, ULONG *pcb, PROPID pid, BOOLEAN fReserved, ULONG *pcIndirect);")
+cpp_quote("BOOLEAN WINAPI StgConvertPropertyToVariant(const SERIALIZEDPROPERTYVALUE* prop, USHORT CodePage, PROPVARIANT* pvar, void* pma);")
 cpp_quote("")
 cpp_quote("#define _PROPVARIANT_INIT_DEFINED_")
 cpp_quote("#define PropVariantInit(p) memset((p), 0, sizeof(PROPVARIANT))")
-- 
2.4.3




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