1 files changed, 99 insertions, 0 deletions
diff --git a/sc/source/filter/oox/biffhelper.cxx b/sc/source/filter/oox/biffhelper.cxx
new file mode 100644
index 000000000..20a088fc7
--- /dev/null
+++ b/sc/source/filter/oox/biffhelper.cxx
@@ -0,0 +1,99 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <biffhelper.hxx>
+
+#include <osl/diagnose.h>
+#include <oox/helper/binaryinputstream.hxx>
+
+#include <limits>
+
+namespace oox::xls {
+
+namespace {
+
+const sal_Int32 BIFF_RK_100FLAG             = 0x00000001;
+const sal_Int32 BIFF_RK_INTFLAG             = 0x00000002;
+const sal_Int32 BIFF_RK_VALUEMASK           = 0xFFFFFFFC;
+
+} // namespace
+
+// conversion -----------------------------------------------------------------
+
+/*static*/ double BiffHelper::calcDoubleFromRk( sal_Int32 nRkValue )
+{
+    sal_math_Double  aMathDouble{};
+    if( getFlag( nRkValue, BIFF_RK_INTFLAG ) )
+    {
+        sal_Int32 nTemp = nRkValue >> 2;
+        setFlag< sal_Int32 >( nTemp, 0xE0000000, nRkValue < 0 );
+        aMathDouble.value = nTemp;
+    }
+    else
+    {
+        aMathDouble.w32_parts.msw = static_cast< sal_uInt32 >( nRkValue & BIFF_RK_VALUEMASK );
+    }
+    if( getFlag( nRkValue, BIFF_RK_100FLAG ) )
+        aMathDouble.value /= 100.0;
+
+    return aMathDouble.value;
+}
+/*static*/ double BiffHelper::calcDoubleFromError( sal_uInt8 nErrorCode )
+{
+    sal_uInt16 nApiError = 0x7FFF;
+    switch( nErrorCode )
+    {
+        case BIFF_ERR_NULL:     nApiError = 521;    break;
+        case BIFF_ERR_DIV0:     nApiError = 532;    break;
+        case BIFF_ERR_VALUE:    nApiError = 519;    break;
+        case BIFF_ERR_REF:      nApiError = 524;    break;
+        case BIFF_ERR_NAME:     nApiError = 525;    break;
+        case BIFF_ERR_NUM:      nApiError = 503;    break;
+        case BIFF_ERR_NA:       nApiError = 0x7FFF; break;
+        default:    OSL_FAIL( "BiffHelper::calcDoubleFromError - unknown error code" );
+    }
+    sal_math_Double  aMathDouble;
+    aMathDouble.value = std::numeric_limits<double>::quiet_NaN();
+    aMathDouble.nan_parts.fraction_lo = nApiError;
+    return  aMathDouble.value;
+}
+
+// BIFF12 import --------------------------------------------------------------
+
+/*static*/ OUString BiffHelper::readString( SequenceInputStream& rStrm, bool b32BitLen )
+{
+    OUString aString;
+    if( !rStrm.isEof() )
+    {
+        sal_Int32 nCharCount = b32BitLen ? rStrm.readValue< sal_Int32 >() : rStrm.readValue< sal_Int16 >();
+        // string length -1 is often used to indicate a missing string
+        OSL_ENSURE( !rStrm.isEof() && (nCharCount >= -1), "BiffHelper::readString - invalid string length" );
+        if( !rStrm.isEof() && (nCharCount > 0) )
+        {
+            // SequenceInputStream always supports getRemaining()
+            nCharCount = ::std::min( nCharCount, static_cast< sal_Int32 >( rStrm.getRemaining() / 2 ) );
+            aString = rStrm.readUnicodeArray( nCharCount );
+        }
+    }
+    return aString;
+}
+
+} // namespace oox::xls
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */