1 files changed, 154 insertions, 0 deletions
diff --git a/tools/source/reversemap/bestreversemap.cxx b/tools/source/reversemap/bestreversemap.cxx
new file mode 100644
index 000000000..f124140c1
--- /dev/null
+++ b/tools/source/reversemap/bestreversemap.cxx
@@ -0,0 +1,154 @@
+/* -*- 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/.
+ */
+
+#include <sal/config.h>
+#include <rtl/textcvt.h>
+
+#include <cstdlib>
+#include <iterator>
+#include <stdio.h>
+
+namespace {
+
+struct Encoder
+{
+    rtl_UnicodeToTextConverter m_aConverter;
+    bool m_bCapable;
+    const char *m_pEncoding;
+    Encoder(rtl_TextEncoding nEncoding, const char *pEncoding)
+        : m_aConverter(rtl_createUnicodeToTextConverter(nEncoding))
+        , m_bCapable(true)
+        , m_pEncoding(pEncoding)
+    {
+    }
+    ~Encoder()
+    {
+        rtl_destroyUnicodeToTextConverter(m_aConverter);
+    }
+    void checkSupports(sal_Unicode c)
+    {
+        char aTempArray[8];
+        sal_Size nTempSize;
+        sal_uInt32 nCvtInfo;
+
+        sal_Size nChars = rtl_convertUnicodeToText(m_aConverter,
+            nullptr, &c, 1, aTempArray, sizeof(aTempArray),
+              RTL_UNICODETOTEXT_FLAGS_UNDEFINED_ERROR |  RTL_UNICODETOTEXT_FLAGS_INVALID_ERROR,
+             &nCvtInfo, &nTempSize);
+        m_bCapable = nChars > 0;
+    }
+    void reset()
+    {
+        m_bCapable = true;
+    }
+    bool isOK() const
+    {
+        return m_bCapable;
+    }
+    const char* getName() const
+    {
+        return m_pEncoding;
+    }
+
+};
+
+}
+
+int main()
+{
+#   define EXP(x) Encoder(x, #x)
+
+    Encoder aConverters[15] =
+    {
+        EXP(RTL_TEXTENCODING_MS_1361),
+        EXP(RTL_TEXTENCODING_MS_950),
+        EXP(RTL_TEXTENCODING_MS_949),
+        EXP(RTL_TEXTENCODING_MS_936),
+        EXP(RTL_TEXTENCODING_MS_932),
+        EXP(RTL_TEXTENCODING_MS_874),
+        EXP(RTL_TEXTENCODING_MS_1258),
+        EXP(RTL_TEXTENCODING_MS_1257),
+        EXP(RTL_TEXTENCODING_MS_1256),
+        EXP(RTL_TEXTENCODING_MS_1255),
+        EXP(RTL_TEXTENCODING_MS_1254),
+        EXP(RTL_TEXTENCODING_MS_1253),
+        EXP(RTL_TEXTENCODING_MS_1251),
+        EXP(RTL_TEXTENCODING_MS_1250),
+        EXP(RTL_TEXTENCODING_MS_1252)
+    };
+
+    printf("//Do not edit manually, generated from bestreversemap.cxx\n");
+    printf("#include <rtl/textenc.h>\n");
+    printf("#include <tools/tenccvt.hxx>\n");
+    printf("rtl_TextEncoding getBestMSEncodingByChar(sal_Unicode c)\n");
+    printf("{\n");
+
+    sal_Unicode c = 0;
+    while (c < 0xFFFF)
+    {
+        for (size_t i = 0; i < std::size(aConverters); ++i)
+            aConverters[i].reset();
+
+        int nMostCapable = -1;
+
+        while(c < 0xFFFF)
+        {
+            bool bSomethingCapable = false;
+            for (size_t i = 0; i < std::size(aConverters); ++i)
+            {
+                if (aConverters[i].isOK())
+                    aConverters[i].checkSupports(c);
+                if (aConverters[i].isOK())
+                {
+                    bSomethingCapable = true;
+                    nMostCapable = i;
+                }
+            }
+            if (!bSomethingCapable)
+                break;
+            ++c;
+        }
+        sal_Unicode cEnd = c;
+        printf("    if (c < 0x%x)\n", c);
+        printf("        return %s;\n", aConverters[nMostCapable].getName());
+        while(c < 0xFFFF)
+        {
+            bool bNothingCapable = true;
+            for (size_t i = 0; i < std::size(aConverters); ++i)
+            {
+                aConverters[i].checkSupports(c);
+                if (aConverters[i].isOK())
+                {
+                    bNothingCapable = false;
+                    break;
+                }
+            }
+            if (!bNothingCapable)
+                break;
+            ++c;
+        }
+        if (cEnd != c)
+        {
+            if (c < 0xFFFF)
+            {
+                printf("    if (c < 0x%x)\n", c);
+                printf("        return RTL_TEXTENCODING_DONTKNOW;\n");
+            }
+            else
+                printf("    return RTL_TEXTENCODING_DONTKNOW;\n");
+        }
+    }
+
+    printf("}\n");
+    fflush(stdout);
+
+    return EXIT_SUCCESS;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */