allow construction of BigInt from sal_Int64 on 32 bit

Change-Id: Ib68920fc9bd693d2f2679b4fc27d9956dc42fc86

3 files changed, 142 insertions, 0 deletions

diff --git a/tools/CppunitTest_tools_test.mk b/tools/CppunitTest_tools_test.mk
index e5fda5fc92b8..87abf590a8db 100644
--- a/tools/CppunitTest_tools_test.mk
+++ b/tools/CppunitTest_tools_test.mk
@@ -14,6 +14,7 @@ $(eval $(call gb_CppunitTest_CppunitTest,tools_test))
 $(eval $(call gb_CppunitTest_use_external,tools_test,boost_headers))
 
 $(eval $(call gb_CppunitTest_add_exception_objects,tools_test, \
+    tools/qa/cppunit/test_bigint \
     tools/qa/cppunit/test_inetmime \
     tools/qa/cppunit/test_pathutils \
     tools/qa/cppunit/test_rational \
diff --git a/tools/qa/cppunit/test_bigint.cxx b/tools/qa/cppunit/test_bigint.cxx
new file mode 100644
index 000000000000..39ab2503f4ac
--- /dev/null
+++ b/tools/qa/cppunit/test_bigint.cxx
@@ -0,0 +1,113 @@
+/* -*- 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 <limits>
+#include <cppunit/TestFixture.h>
+#include <cppunit/extensions/HelperMacros.h>
+
+#include <rtl/math.hxx>
+
+#include <tools/bigint.hxx>
+
+namespace tools
+{
+
+class BigIntTest : public CppUnit::TestFixture
+{
+public:
+#if SAL_TYPES_SIZEOFLONG < SAL_TYPES_SIZEOFLONGLONG
+    void testConstructionFromInt64();
+#endif
+
+    CPPUNIT_TEST_SUITE(BigIntTest);
+#if SAL_TYPES_SIZEOFLONG < SAL_TYPES_SIZEOFLONGLONG
+    CPPUNIT_TEST(testConstructionFromLongLong);
+#endif
+    CPPUNIT_TEST_SUITE_END();
+};
+
+#if SAL_TYPES_SIZEOFLONG < SAL_TYPES_SIZEOFLONGLONG
+void BigIntTest::testConstructionFromLongLong()
+{
+    // small positive number
+    {
+        BigInt bi(static_cast<sal_Int64>(42));
+        CPPUNIT_ASSERT(bi.IsSet());
+        CPPUNIT_ASSERT(!bi.IsZero());
+        CPPUNIT_ASSERT(!bi.IsNeg());
+        CPPUNIT_ASSERT(bi.IsLong());
+        CPPUNIT_ASSERT_EQUAL(42L, bi);
+    }
+
+    // small negative number
+    {
+        BigInt bi(static_cast<sal_Int64>(-42));
+        CPPUNIT_ASSERT(bi.IsSet());
+        CPPUNIT_ASSERT(!bi.IsZero());
+        CPPUNIT_ASSERT(bi.IsNeg());
+        CPPUNIT_ASSERT(bi.IsLong());
+        CPPUNIT_ASSERT_EQUAL(-42L, bi);
+    }
+
+    // positive number just fitting to long
+    {
+        BigInt bi(static_cast<sal_Int64>(std::numeric_limits<long>::max()));
+        CPPUNIT_ASSERT(bi.IsSet());
+        CPPUNIT_ASSERT(!bi.IsZero());
+        CPPUNIT_ASSERT(!bi.IsNeg());
+        CPPUNIT_ASSERT(bi.IsLong());
+        CPPUNIT_ASSERT_EQUAL(std::numeric_limits<long>::max(), bi);
+    }
+
+    // negative number just fitting to long
+    {
+        BigInt bi(static_cast<sal_Int64>(std::numeric_limits<long>::min()));
+        CPPUNIT_ASSERT(bi.IsSet());
+        CPPUNIT_ASSERT(!bi.IsZero());
+        CPPUNIT_ASSERT(bi.IsNeg());
+        CPPUNIT_ASSERT(bi.IsLong());
+        CPPUNIT_ASSERT_EQUAL(std::numeric_limits<long>::min(), bi);
+    }
+
+    // positive number not fitting to long
+    {
+        BigInt bi(static_cast<sal_Int64>(std::numeric_limits<long>::max() + 1));
+        CPPUNIT_ASSERT(bi.IsSet());
+        CPPUNIT_ASSERT(!bi.IsZero());
+        CPPUNIT_ASSERT(!bi.IsNeg());
+        CPPUNIT_ASSERT(!bi.IsLong());
+    }
+
+    // negative number not fitting to long
+    {
+        BigInt bi(static_cast<sal_Int64>(std::numeric_limits<long>::min() - 1));
+        BigInt bi(static_cast<sal_Int64>(42));
+        CPPUNIT_ASSERT(bi.IsSet());
+        CPPUNIT_ASSERT(!bi.IsZero());
+        CPPUNIT_ASSERT(bi.IsNeg());
+        CPPUNIT_ASSERT(!bi.IsLong());
+    }
+}
+#endif
+
+CPPUNIT_TEST_SUITE_REGISTRATION(BigIntTest);
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/tools/source/generic/bigint.cxx b/tools/source/generic/bigint.cxx
index 3311efd459b5..43c0f68c3425 100644
--- a/tools/source/generic/bigint.cxx
+++ b/tools/source/generic/bigint.cxx
@@ -17,6 +17,7 @@
  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  */
 
+#include <limits>
 #include <math.h>
 
 #include <rtl/ustrbuf.hxx>
@@ -577,6 +578,33 @@ BigInt::BigInt( sal_uInt32 nValue )
     }
 }
 
+#if SAL_TYPES_SIZEOFLONG < SAL_TYPES_SIZEOFLONGLONG
+BigInt::BigInt( long long nValue )
+    : nVal(0)
+{
+    bIsSet = true;
+    bIsNeg = nValue < 0;
+    nLen = 0;
+
+    unsigned long long nUValue = static_cast<unsigned long long>(bIsNeg ? -nValue : nValue);
+    if (nUValue >= std::numeric_limits<long>::max())
+    {
+        bIsBig  = true;
+        for (int i = 0; (i != sizeof(unsigned long long) / 2) && (nUValue != 0); ++i)
+        {
+            nNum[i] = static_cast<sal_uInt16>(nUValue & 0xffffUL);
+            nUValue = nUValue >> 16;
+            ++nLen;
+        }
+    }
+    else
+    {
+        bIsBig = false;
+        nVal   = static_cast<long>(nValue);
+    }
+}
+#endif
+
 BigInt::operator sal_uIntPtr() const
 {
     if ( !bIsBig )