libcore: Added conversion of DOS code page 437 to Unicode

doomsday/sdk/libcore/include/de/charsymbols.h

@@ -19,6 +19,8 @@
 #ifndef LIBDENG2_CHARSYMBOLS_H
 #define LIBDENG2_CHARSYMBOLS_H
 
+#include "libcore.h"
+
 /**
  * @defgroup unicodeSymbols Unicode Symbols
  * Unicode key symbols. @ingroup types
@@ -56,4 +58,18 @@
 #endif
 /** @} */
 
+namespace de {
+
+/**
+ * Converts the IBM PC character set to the Unicode equivalents.
+ * See: https://en.wikipedia.org/wiki/Code_page_437
+ *
+ * @param code  Character code.
+ *
+ * @return Unicode character.
+ */
+DENG2_PUBLIC duint codePage437ToUnicode(dbyte code);
+
+} // namespace de
+
 #endif // LIBDENG2_CHARSYMBOLS_H

doomsday/sdk/libcore/include/de/data/string.h

@@ -311,6 +311,16 @@ class DENG2_PUBLIC String : public QString
      */
     static String fromLatin1(IByteArray const &byteArray);
 
+    /**
+     * Builds a String out of an array of bytes using the IBM PC character set
+     * (DOS code page 437).
+     *
+     * @param byteArray  Characters to convert.
+     *
+     * @return Converted string.
+     */
+    static String fromCP437(IByteArray const &byteArray);
+
     static dint compareWithCase(QChar const *a, QChar const *b, dsize count);
 
     /**

doomsday/sdk/libcore/src/charsymbols.cpp

@@ -0,0 +1,64 @@
+/** @file charsymbols.cpp  Character (Unicode) symbols.
+ *
+ * @authors Copyright (c) 2016 Jaakko Keränen <jaakko.keranen@iki.fi>
+ *
+ * @par License
+ * LGPL: http://www.gnu.org/licenses/lgpl.html
+ *
+ * <small>This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or (at your
+ * option) any later version. This program is distributed in the hope that it
+ * will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+ * General Public License for more details. You should have received a copy of
+ * the GNU Lesser General Public License along with this program; if not, see:
+ * http://www.gnu.org/licenses</small>
+ */
+
+#include "de/charsymbols.h"
+
+namespace de {
+
+static duint const codePage437[256] =
+{
+    0x0000, 0x0001, 0x0002, 0x0003, 0x0004, 0x0005, 0x0006, 0x0007,
+    0x0008, 0x0009, 0x000A, 0x000B, 0x000C, 0x000D, 0x000E, 0x000F,
+    0x0010, 0x0011, 0x0012, 0x0013, 0x0014, 0x0015, 0x0016, 0x0017,
+    0x0018, 0x0019, 0x001A, 0x001B, 0x001C, 0x001D, 0x001E, 0x001F,
+    0x0020, 0x0021, 0x0022, 0x0023, 0x0024, 0x0025, 0x0026, 0x0027,
+    0x0028, 0x0029, 0x002A, 0x002B, 0x002C, 0x002D, 0x002E, 0x002F,
+    0x0030, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035, 0x0036, 0x0037,
+    0x0038, 0x0039, 0x003A, 0x003B, 0x003C, 0x003D, 0x003E, 0x003F,
+    0x0040, 0x0041, 0x0042, 0x0043, 0x0044, 0x0045, 0x0046, 0x0047,
+    0x0048, 0x0049, 0x004A, 0x004B, 0x004C, 0x004D, 0x004E, 0x004F,
+    0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056, 0x0057,
+    0x0058, 0x0059, 0x005A, 0x005B, 0x005C, 0x005D, 0x005E, 0x005F,
+    0x0060, 0x0061, 0x0062, 0x0063, 0x0064, 0x0065, 0x0066, 0x0067,
+    0x0068, 0x0069, 0x006A, 0x006B, 0x006C, 0x006D, 0x006E, 0x006F,
+    0x0070, 0x0071, 0x0072, 0x0073, 0x0074, 0x0075, 0x0076, 0x0077,
+    0x0078, 0x0079, 0x007A, 0x007B, 0x007C, 0x007D, 0x007E, 0x007F,
+    0x00C7, 0x00FC, 0x00E9, 0x00E2, 0x00E4, 0x00E0, 0x00E5, 0x00E7,
+    0x00EA, 0x00EB, 0x00E8, 0x00EF, 0x00EE, 0x00EC, 0x00C4, 0x00C5,
+    0x00C9, 0x00E6, 0x00C6, 0x00F4, 0x00F6, 0x00F2, 0x00FB, 0x00F9,
+    0x00FF, 0x00D6, 0x00DC, 0x00A2, 0x00A3, 0x00A5, 0x20A7, 0x0192,
+    0x00E1, 0x00ED, 0x00F3, 0x00FA, 0x00F1, 0x00D1, 0x00AA, 0x00BA,
+    0x00BF, 0x2310, 0x00AC, 0x00BD, 0x00BC, 0x00A1, 0x00AB, 0x00BB,
+    0x2591, 0x2592, 0x2593, 0x2502, 0x2524, 0x2561, 0x2562, 0x2556,
+    0x2555, 0x2563, 0x2551, 0x2557, 0x255D, 0x255C, 0x255B, 0x2510,
+    0x2514, 0x2534, 0x252C, 0x251C, 0x2500, 0x253C, 0x255E, 0x255F,
+    0x255A, 0x2554, 0x2569, 0x2566, 0x2560, 0x2550, 0x256C, 0x2567,
+    0x2568, 0x2564, 0x2565, 0x2559, 0x2558, 0x2552, 0x2553, 0x256B,
+    0x256A, 0x2518, 0x250C, 0x2588, 0x2584, 0x258C, 0x2590, 0x2580,
+    0x03B1, 0x00DF, 0x0393, 0x03C0, 0x03A3, 0x03C3, 0x00B5, 0x03C4,
+    0x03A6, 0x0398, 0x03A9, 0x03B4, 0x221E, 0x03C6, 0x03B5, 0x2229,
+    0x2261, 0x00B1, 0x2265, 0x2264, 0x2320, 0x2321, 0x00F7, 0x2248,
+    0x00B0, 0x2219, 0x00B7, 0x221A, 0x207F, 0x00B2, 0x25A0, 0x00A0
+};
+
+duint codePage437ToUnicode(dbyte code)
+{
+    return codePage437[code];
+}
+
+} // namespace de

doomsday/sdk/libcore/src/data/string.cpp

@@ -20,6 +20,7 @@
 #include "de/App"
 #include "de/String"
 #include "de/Block"
+#include "de/charsymbols.h"
 
 #include <QDir>
 #include <QTextStream>
@@ -708,6 +709,18 @@ String String::fromLatin1(IByteArray const &byteArray)
     return QString::fromLatin1(reinterpret_cast<char const *>(Block(byteArray).data()));
 }
 
+String String::fromCP437(IByteArray const &byteArray)
+{
+    Block const chars(byteArray);
+    String conv;
+    conv.reserve(byteArray.size());
+    for (dbyte ch : chars)
+    {
+        conv.append(codePage437ToUnicode(ch));
+    }
+    return conv;
+}
+
 size_t de::qchar_strlen(QChar const *str)
 {
     if (!str) return 0;