| 1 |
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| 2 | /*
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| 3 | *@@sourcefile encodings.c:
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| 4 | * character encoding translations.
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| 5 | *
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| 6 | * See encCreateCodec for an introduction.
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| 7 | *
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| 8 | * Be warned, compilation of this file takes a long
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| 9 | * file because this includes all the complex codepage
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| 10 | * from include\encodings.
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| 11 | *
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| 12 | *@@header "encodings\base.h"
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| 13 | *@@added V0.9.9 (2001-02-14) [umoeller]
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| 14 | */
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| 15 |
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| 16 | /*
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| 17 | * Copyright (C) 2001 Ulrich Mller.
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| 18 | * This file is part of the "XWorkplace helpers" source package.
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| 19 | * This is free software; you can redistribute it and/or modify
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| 20 | * it under the terms of the GNU General Public License as published
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| 21 | * by the Free Software Foundation, in version 2 as it comes in the
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| 22 | * "COPYING" file of the XWorkplace main distribution.
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| 23 | * This program is distributed in the hope that it will be useful,
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| 24 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 25 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 26 | * GNU General Public License for more details.
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| 27 | */
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| 28 |
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| 29 | #define OS2EMX_PLAIN_CHAR
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| 30 | // this is needed for "os2emx.h"; if this is defined,
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| 31 | // emx will define PSZ as _signed_ char, otherwise
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| 32 | // as unsigned char
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| 33 |
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| 34 | #include <stdlib.h>
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| 35 | #include <string.h>
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| 36 |
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| 37 | #include "setup.h" // code generation and debugging options
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| 38 |
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| 39 | #include "helpers\standards.h"
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| 40 |
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| 41 | #include "encodings\base.h"
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| 42 | #include "encodings\alltables.h"
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| 43 | // #include "encodings\collate.h"
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| 44 |
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| 45 | #pragma hdrstop
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| 46 |
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| 47 | /*
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| 48 | *@@category: Helpers\National Language Support\Encodings
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| 49 | * See encodings.c.
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| 50 | */
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| 51 |
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| 52 | /*
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| 53 | *@@ G_aEncodings:
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| 54 | * list of all encodings supported by this engine
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| 55 | * (i.e. we have a corresponding codepage in
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| 56 | * include\encodings\*.h) together with some
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| 57 | * additional information for each encoding,
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| 58 | * such as the corresponding OS/2 codepage
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| 59 | * number and a descriptive string.
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| 60 | *
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| 61 | *@@added V [umoeller]
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| 62 | */
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| 63 |
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| 64 | struct
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| 65 | {
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| 66 | ENCID id; // engine ID (enum)
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| 67 | PXWPENCODINGMAP pMap; // ptr to map from include\encodings\*.h
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| 68 | unsigned long cEntries; // entries in map (array item count)
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| 69 | unsigned short usCodepageOS2; // corresponding OS/2 codepage or 0 if none
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| 70 | ENCBYTECOUNT bc;
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| 71 | const char *pcszDescription; // description
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| 72 | } G_aEncodings[] =
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| 73 | {
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| 74 | #define ENCODINGENTRY(id) enc_ ## id, G_ ## id, ARRAYITEMCOUNT(G_ ## id)
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| 75 |
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| 76 | ENCODINGENTRY(cp437), 437, SINGLE, "DOS Latin US",
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| 77 | ENCODINGENTRY(cp737), 737, SINGLE, "DOS Greek",
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| 78 | ENCODINGENTRY(cp775), 775, SINGLE, "DOS BaltRim",
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| 79 | ENCODINGENTRY(cp850), 850, SINGLE, "DOS Latin 1",
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| 80 | ENCODINGENTRY(cp852), 852, SINGLE, "DOS Latin 2", // default in Hungary,
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| 81 | // Romania, Poland
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| 82 | ENCODINGENTRY(cp855), 855, SINGLE, "DOS Cyrillic",
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| 83 | ENCODINGENTRY(cp857), 857, SINGLE, "DOS Latin 5 (Turkish)",
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| 84 | ENCODINGENTRY(cp860), 860, SINGLE, "DOS Portuguese",
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| 85 | ENCODINGENTRY(cp861), 861, SINGLE, "DOS Icelandic",
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| 86 | ENCODINGENTRY(cp862), 862, SINGLE, "DOS Hebrew",
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| 87 | ENCODINGENTRY(cp863), 863, SINGLE, "DOS Canadian French",
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| 88 | ENCODINGENTRY(cp864), 864, SINGLE, "DOS Arabic", // default in Egypt
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| 89 | ENCODINGENTRY(cp865), 865, SINGLE, "DOS Nordic",
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| 90 | ENCODINGENTRY(cp866), 866, SINGLE, "DOS Cyrillic Russian", // default in Russia
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| 91 | ENCODINGENTRY(cp869), 869, SINGLE, "DOS Greek2",
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| 92 | ENCODINGENTRY(cp874), 874, SINGLE, "DOS Thai (TIS-620)", // default in Thailand
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| 93 |
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| 94 | ENCODINGENTRY(cp932), 932 /* or 943?*/ , DOUBLE, "Japanese Windows",
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| 95 | ENCODINGENTRY(cp936), 936 /* or 946?*/ , DOUBLE, "Chinese",
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| 96 | ENCODINGENTRY(cp949), 951 /* or 949?*/ , DOUBLE, "Korean",
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| 97 | ENCODINGENTRY(cp950), 947 /* or 950?*/ , DOUBLE, "Taiwan Big-5", // default in China?
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| 98 |
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| 99 | ENCODINGENTRY(cp1004), 1004, SINGLE, "Windows Extended",
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| 100 | ENCODINGENTRY(cp1250), 1250, SINGLE, "Windows Latin 2",
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| 101 | ENCODINGENTRY(cp1251), 1251, SINGLE, "Windows Cyrillic",
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| 102 | ENCODINGENTRY(cp1252), 1252, SINGLE, "Windows Latin 1",
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| 103 | ENCODINGENTRY(cp1253), 1253, SINGLE, "Windows Greek",
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| 104 | ENCODINGENTRY(cp1254), 1254, SINGLE, "Windows Turkish",
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| 105 | ENCODINGENTRY(cp1255), 1255, SINGLE, "Windows Hebrew",
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| 106 | ENCODINGENTRY(cp1256), 1256, SINGLE, "Windows Arabic",
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| 107 | ENCODINGENTRY(cp1257), 1257, SINGLE, "Windows Latin-4",
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| 108 | ENCODINGENTRY(cp1258), 1258, UNKNOWN, "unknown",
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| 109 | ENCODINGENTRY(iso8859_1), 819, SINGLE, "ISO/IEC 8859-1:1998 (Latin-1)",
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| 110 | ENCODINGENTRY(iso8859_2), 912, SINGLE, "ISO 8859-2:1999 (Latin-2)",
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| 111 | ENCODINGENTRY(iso8859_3), 913, SINGLE, "ISO/IEC 8859-3:1999 (Latin-3)",
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| 112 | ENCODINGENTRY(iso8859_4), 914, SINGLE, "ISO/IEC 8859-4:1998 (Latin-4)",
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| 113 | ENCODINGENTRY(iso8859_5), 915, SINGLE, "ISO 8859-5:1999 (Cyrillic)",
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| 114 | ENCODINGENTRY(iso8859_6), 1089, SINGLE, "ISO 8859-6:1999 (Arabic)",
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| 115 | ENCODINGENTRY(iso8859_7), 813, SINGLE, "ISO 8859-7:1987 (Greek)", // default in Greece
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| 116 | ENCODINGENTRY(iso8859_8), 916, SINGLE, "ISO/IEC 8859-8:1999 (Hebrew)",
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| 117 | ENCODINGENTRY(iso8859_9), 920, SINGLE, "ISO/IEC 8859-9:1999 (Latin-5)",
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| 118 | ENCODINGENTRY(iso8859_10), 0, SINGLE, "ISO/IEC 8859-10:1998",
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| 119 | ENCODINGENTRY(iso8859_13), 0, SINGLE, "ISO/IEC 8859-13:1998",
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| 120 | ENCODINGENTRY(iso8859_14), 0, SINGLE, "ISO/IEC 8859-14:1998",
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| 121 | ENCODINGENTRY(iso8859_15), 923, SINGLE, "ISO/IEC 8859-15:1999",
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| 122 |
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| 123 | UNSUPPORTED, NULL, 0, 1200, MULTI_UNICODE, "Unicode UCS-2",
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| 124 | UNSUPPORTED, NULL, 0, 1208, MULTI_UNICODE, "Unicode UTF-8"
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| 125 | };
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| 126 |
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| 127 | /*
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| 128 | *@@ encGetTable:
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| 129 | *
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| 130 | *@@added V0.9.18 (2002-03-08) [umoeller]
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| 131 | */
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| 132 |
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| 133 | int encGetTable(ENCID id,
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| 134 | PXWPENCODINGMAP *ppMap,
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| 135 | unsigned long *pcEntries)
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| 136 | {
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| 137 | unsigned long ul;
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| 138 | for (ul = 0;
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| 139 | ul < ARRAYITEMCOUNT(G_aEncodings);
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| 140 | ul++)
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| 141 | {
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| 142 | if (G_aEncodings[ul].id == id)
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| 143 | {
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| 144 | *ppMap = G_aEncodings[ul].pMap;
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| 145 | *pcEntries = G_aEncodings[ul].cEntries;
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| 146 | return (1);
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| 147 | }
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| 148 | }
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| 149 |
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| 150 | return (0);
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| 151 | }
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| 152 |
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| 153 | /*
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| 154 | *@@ encFindIdForCodepage:
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| 155 | * returns the ENCID for the given OS/2
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| 156 | * codepage, or UNSUPPORTED if there's none.
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| 157 | *
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| 158 | *@@added V0.9.18 (2002-03-08) [umoeller]
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| 159 | */
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| 160 |
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| 161 | ENCID encFindIdForCodepage(unsigned short usCodepage, // in: codepage to find
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| 162 | const char **ppcszDescription, // out: codepage description; ptr can be NULL
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| 163 | ENCBYTECOUNT *pByteCount) // out: SINGLE or DOUBLE; ptr can be NULL
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| 164 | {
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| 165 | unsigned long ul;
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| 166 | for (ul = 0;
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| 167 | ul < ARRAYITEMCOUNT(G_aEncodings);
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| 168 | ul++)
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| 169 | {
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| 170 | if (G_aEncodings[ul].usCodepageOS2 == usCodepage)
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| 171 |
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| 172 | {
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| 173 | if (ppcszDescription)
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| 174 | *ppcszDescription = G_aEncodings[ul].pcszDescription;
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| 175 | if (pByteCount)
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| 176 | *pByteCount = G_aEncodings[ul].bc;
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| 177 | return G_aEncodings[ul].id;
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| 178 | }
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| 179 | }
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| 180 |
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| 181 | return (UNSUPPORTED);
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| 182 | }
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| 183 |
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| 184 | /*
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| 185 | *@@ encCreateCodec:
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| 186 | * creates a codec that can be used for conversion between
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| 187 | * Unicode and codepaged characters (and vice versa).
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| 188 | *
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| 189 | * A codec essentially consists of two tables which can
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| 190 | * be used for quick index-based lookups in both directions.
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| 191 | * This function goes thru the tables provided in
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| 192 | * include\encodings\*.h and builds the codec tables
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| 193 | * from them.
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| 194 | *
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| 195 | * This function takes an encoding ID as input. Each
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| 196 | * codepage table in include\encodings\*.h has one
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| 197 | * of those IDs assigned. Use encFindIdForCodepage
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| 198 | * to find the ID for a given OS/2 codepage.
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| 199 | *
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| 200 | * Use codecs carefully and only when they are really
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| 201 | * needed for a specific conversion. Building a codec
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| 202 | * is expensive, so you should create a codec once
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| 203 | * and reuse it for future conversions. In addition,
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| 204 | * create codecs only for the codepages that are
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| 205 | * actually used. Each codec will take up
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| 206 | * n * sizeof(USHORT) bytes, where n is the highest
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| 207 | * Unicode character used in the codepage.
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| 208 | *
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| 209 | * Codec remarks:
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| 210 | *
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| 211 | * -- All codepages share the first 128 characters
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| 212 | * (0-0x7F) with ASCII.
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| 213 | *
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| 214 | * -- Since the first 128 characters (0-0x7F) in
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| 215 | * Unicode are equivalent to ASCII also, codecs
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| 216 | * are not needed if you process ASCII strings
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| 217 | * only.
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| 218 | *
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| 219 | * -- Since the next 128 characters (0x80-0xFF) in
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| 220 | * Unicode are equivalent to ISO/IEC 8859-1
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| 221 | * (Latin-1), codecs aren't needed for those
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| 222 | * strings either.
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| 223 | *
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| 224 | * Note that codepoints 0x80-0x9F are undefined
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| 225 | * in Latin-1 but used as control sequences in
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| 226 | * Unicode.
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| 227 | *
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| 228 | * -- As far as I know, codepage 1252, which is
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| 229 | * used per default under Windows, is equivalent
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| 230 | * to Latin 1 except that it also defines
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| 231 | * codepoints 0x80-0x9F to certain DTP characters.
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| 232 | *
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| 233 | * -- From my testing, codepage 1004 (which is
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| 234 | * described as "Windows-compatible" in most OS/2
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| 235 | * docs) is the same as codepage 1252, except for
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| 236 | * character 0xAF.
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| 237 | *
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| 238 | * Unfortunately, OS/2 uses codepage 850 on most
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| 239 | * systems (and Windows uses OS/2 codepage 1252),
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| 240 | * so for conversion between those, codecs are needed.
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| 241 | */
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| 242 |
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| 243 | PCONVERSION encCreateCodec(ENCID id)
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| 244 | {
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| 245 | PXWPENCODINGMAP pEncodingMap;
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| 246 | unsigned long cArrayEntries;
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| 247 |
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| 248 | if (encGetTable(id,
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| 249 | &pEncodingMap,
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| 250 | &cArrayEntries))
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| 251 | {
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| 252 | unsigned short usHighestCP = 0,
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| 253 | usHighestUni = 0;
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| 254 | unsigned long ul;
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| 255 |
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| 256 | // step 1:
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| 257 | // run through the table and calculate the highest
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| 258 | // character entry used
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| 259 | for (ul = 0;
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| 260 | ul < cArrayEntries;
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| 261 | ul++)
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| 262 | {
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| 263 | if (pEncodingMap[ul].usCP > usHighestCP)
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| 264 | usHighestCP = pEncodingMap[ul].usCP;
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| 265 | if (pEncodingMap[ul].usUni > usHighestUni)
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| 266 | usHighestUni = pEncodingMap[ul].usUni;
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| 267 | }
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| 268 |
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| 269 | // step 2: allocate encoding table
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| 270 | if (usHighestCP && usHighestUni)
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| 271 | {
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| 272 | PCONVERSION pTableNew;
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| 273 | if (pTableNew = NEW(CONVERSION))
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| 274 | {
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| 275 | unsigned long cbEntriesUniFromCP
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| 276 | = (usHighestCP + 1) * sizeof(unsigned short);
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| 277 | unsigned long cbEntriesCPFromUni
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| 278 | = (usHighestUni + 1) * sizeof(unsigned short);
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| 279 |
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| 280 | ZERO(pTableNew);
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| 281 |
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| 282 | pTableNew->usHighestCP = usHighestCP;
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| 283 | pTableNew->usHighestUni = usHighestUni;
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| 284 |
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| 285 | if ( (pTableNew->ausEntriesUniFromCP
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| 286 | = (unsigned short*)malloc(cbEntriesUniFromCP))
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| 287 | && (pTableNew->ausEntriesCPFromUni
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| 288 | = (unsigned short*)malloc(cbEntriesCPFromUni))
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| 289 | )
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| 290 | {
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| 291 | // step 3: fill encoding tables
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| 292 |
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| 293 | memset(pTableNew->ausEntriesUniFromCP,
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| 294 | 0xFF,
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| 295 | cbEntriesUniFromCP);
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| 296 | memset(pTableNew->ausEntriesCPFromUni,
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| 297 | 0xFF,
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| 298 | cbEntriesCPFromUni);
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| 299 |
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| 300 | for (ul = 0;
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| 301 | ul < cArrayEntries;
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| 302 | ul++)
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| 303 | {
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| 304 | PXWPENCODINGMAP pEntry = &pEncodingMap[ul];
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| 305 |
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| 306 | pTableNew->ausEntriesUniFromCP[pEntry->usCP] = pEntry->usUni;
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| 307 |
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| 308 | pTableNew->ausEntriesCPFromUni[pEntry->usUni] = pEntry->usCP;
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| 309 | }
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| 310 |
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| 311 | return (pTableNew);
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| 312 | }
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| 313 |
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| 314 | free(pTableNew);
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| 315 | }
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| 316 | }
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| 317 | }
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| 318 |
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| 319 | return NULL;
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| 320 | }
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| 321 |
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| 322 | /*
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| 323 | *@@ encFreeCodec:
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| 324 | * frees a codec created with encFreeConversion
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| 325 | * and sets the given pointer to NULL.
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| 326 | *
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| 327 | *@@added V0.9.18 (2002-03-08) [umoeller]
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| 328 | */
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| 329 |
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| 330 | void encFreeCodec(PCONVERSION *ppTable) // in: ptr to codec ptr returned by encCreateCodec
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| 331 | {
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| 332 | PCONVERSION pTable;
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| 333 | if (pTable = *ppTable)
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| 334 | {
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| 335 | if (pTable->ausEntriesUniFromCP)
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| 336 | free(pTable->ausEntriesUniFromCP);
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| 337 | if (pTable->ausEntriesCPFromUni)
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| 338 | free(pTable->ausEntriesCPFromUni);
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| 339 | free(pTable);
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| 340 | *ppTable = NULL;
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| 341 | }
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| 342 | }
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| 343 |
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| 344 | /*
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| 345 | *@@ encChar2Uni:
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| 346 | * converts a codepage-specific character
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| 347 | * to Unicode, using the given conversion
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| 348 | * table from encCreateCodec().
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| 349 | *
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| 350 | * Returns 0xFFFF on errors, which is unlikely
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| 351 | * with Unicode though.
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| 352 | *
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| 353 | *@@added V0.9.18 (2002-03-08) [umoeller]
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| 354 | */
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| 355 |
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| 356 | unsigned long encChar2Uni(PCONVERSION pTable,
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| 357 | unsigned short c)
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| 358 | {
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| 359 | if ( (pTable)
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| 360 | && (c <= pTable->usHighestCP)
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| 361 | )
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| 362 | return (pTable->ausEntriesUniFromCP[c]);
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| 363 |
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| 364 | return (0xFFFF);
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| 365 | }
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| 366 |
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| 367 | /*
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| 368 | *@@ encUni2Char:
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| 369 | * converts a Unicode character to the
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| 370 | * codepage specified by the given
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| 371 | * conversion table from encCreateCodec().
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| 372 | *
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| 373 | * Returns 0xFFFF if the Unicode character
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| 374 | * has no codepage equivalent.
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| 375 | *
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| 376 | *@@added V0.9.18 (2002-03-08) [umoeller]
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| 377 | */
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| 378 |
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| 379 | unsigned short encUni2Char(PCONVERSION pTable,
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| 380 | unsigned long ulUni)
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| 381 | {
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| 382 | if ( (pTable)
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| 383 | && (ulUni <= pTable->usHighestUni)
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| 384 | )
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| 385 | return (pTable->ausEntriesCPFromUni[ulUni]);
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| 386 |
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| 387 | return (0xFFFF);
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| 388 | }
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| 389 |
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| 390 | /*
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| 391 | *@@ encDecodeUTF8:
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| 392 | * decodes one UTF-8 character and returns
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| 393 | * the Unicode value or -1 if the character
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| 394 | * is invalid.
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| 395 | *
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| 396 | * On input, *ppch is assumed to point to
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| 397 | * the first byte of the UTF-8 char to be
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| 398 | * read.
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| 399 | *
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| 400 | * This function will advance *ppch by at
|
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| 401 | * least one byte (or more if the UTF-8
|
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| 402 | * char initially pointed to introduces
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| 403 | * a multi-byte sequence).
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| 404 | *
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| 405 | * This returns -1 if *ppch points to an
|
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| 406 | * invalid encoding (in which case the
|
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| 407 | * pointer is advanced anyway).
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| 408 | *
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|---|
| 409 | * This returns 0 if **ppch points to a
|
|---|
| 410 | * null character.
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|---|
| 411 | *
|
|---|
| 412 | *@@added V0.9.14 (2001-08-09) [umoeller]
|
|---|
| 413 | */
|
|---|
| 414 |
|
|---|
| 415 | unsigned long encDecodeUTF8(const char **ppch)
|
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| 416 | {
|
|---|
| 417 | unsigned long ulChar;
|
|---|
| 418 |
|
|---|
| 419 | if (!(ulChar = **ppch))
|
|---|
| 420 | // null is null
|
|---|
| 421 | return 0;
|
|---|
| 422 |
|
|---|
| 423 | // if (ulChar < 0x80): simple, one byte only... use that
|
|---|
| 424 |
|
|---|
| 425 | if (ulChar < 0x80)
|
|---|
| 426 | {
|
|---|
| 427 | (*ppch)++;
|
|---|
| 428 | return (ulChar);
|
|---|
| 429 | }
|
|---|
| 430 | else
|
|---|
| 431 | {
|
|---|
| 432 | unsigned long ulCount = 1;
|
|---|
| 433 | int fIllegal = 0;
|
|---|
| 434 |
|
|---|
| 435 | // note: 0xc0 and 0xc1 are reserved and
|
|---|
| 436 | // cannot appear as the first UTF-8 byte
|
|---|
| 437 |
|
|---|
| 438 | if ( (ulChar >= 0xc2)
|
|---|
| 439 | && (ulChar < 0xe0)
|
|---|
| 440 | )
|
|---|
| 441 | {
|
|---|
| 442 | // that's two bytes
|
|---|
| 443 | ulCount = 2;
|
|---|
| 444 | ulChar &= 0x1f;
|
|---|
| 445 | }
|
|---|
| 446 | else if ((ulChar & 0xf0) == 0xe0)
|
|---|
| 447 | {
|
|---|
| 448 | // three bytes
|
|---|
| 449 | ulCount = 3;
|
|---|
| 450 | ulChar &= 0x0f;
|
|---|
| 451 | }
|
|---|
| 452 | else if ((ulChar & 0xf8) == 0xf0)
|
|---|
| 453 | {
|
|---|
| 454 | // four bytes
|
|---|
| 455 | ulCount = 4;
|
|---|
| 456 | ulChar &= 0x07;
|
|---|
| 457 | }
|
|---|
| 458 | else if ((ulChar & 0xfc) == 0xf8)
|
|---|
| 459 | {
|
|---|
| 460 | // five bytes
|
|---|
| 461 | ulCount = 5;
|
|---|
| 462 | ulChar &= 0x03;
|
|---|
| 463 | }
|
|---|
| 464 | else if ((ulChar & 0xfe) == 0xfc)
|
|---|
| 465 | {
|
|---|
| 466 | // six bytes
|
|---|
| 467 | ulCount = 6;
|
|---|
| 468 | ulChar &= 0x01;
|
|---|
| 469 | }
|
|---|
| 470 | else
|
|---|
| 471 | ++fIllegal;
|
|---|
| 472 |
|
|---|
| 473 | if (!fIllegal)
|
|---|
| 474 | {
|
|---|
| 475 | // go for the second and more bytes then
|
|---|
| 476 | int ul2;
|
|---|
| 477 |
|
|---|
| 478 | for (ul2 = 1;
|
|---|
| 479 | ul2 < ulCount;
|
|---|
| 480 | ++ul2)
|
|---|
| 481 | {
|
|---|
| 482 | unsigned long ulChar2 = *((*ppch) + ul2);
|
|---|
| 483 |
|
|---|
| 484 | if (!(ulChar2 & 0xc0)) // != 0x80)
|
|---|
| 485 | {
|
|---|
| 486 | ++fIllegal;
|
|---|
| 487 | break;
|
|---|
| 488 | }
|
|---|
| 489 |
|
|---|
| 490 | ulChar <<= 6;
|
|---|
| 491 | ulChar |= ulChar2 & 0x3f;
|
|---|
| 492 | }
|
|---|
| 493 | }
|
|---|
| 494 |
|
|---|
| 495 | if (fIllegal)
|
|---|
| 496 | {
|
|---|
| 497 | // skip all the following characters
|
|---|
| 498 | // until we find something with bit 7 off
|
|---|
| 499 | do
|
|---|
| 500 | {
|
|---|
| 501 | ulChar = *(++(*ppch));
|
|---|
| 502 | if (!ulChar)
|
|---|
| 503 | break;
|
|---|
| 504 | } while (ulChar & 0x80);
|
|---|
| 505 | }
|
|---|
| 506 | else
|
|---|
| 507 | *ppch += ulCount;
|
|---|
| 508 | }
|
|---|
| 509 |
|
|---|
| 510 | return (ulChar);
|
|---|
| 511 | }
|
|---|
| 512 |
|
|---|
| 513 |
|
|---|
