TB9.2 Example Applications: examples/PIPS/antiword/src/utf8.c Source File

00001 /*
-00002  * utf8.c
-00003  * Copyright (C) 2001-2004 A.J. van Os; Released under GPL
-00004  *
-00005  *====================================================================
-00006  * This part of the software is based on:
-00007  * An implementation of wcwidth() as defined in
-00008  * "The Single UNIX Specification, Version 2, The Open Group, 1997"
-00009  * <http://www.UNIX-systems.org/online.html>
-00010  * Markus Kuhn -- 2001-01-12 -- public domain
-00011  *====================================================================
-00012  * The credit should go to him, but all the bugs are mine.
-00013  */
-00014 
-00015 #include <stdlib.h>
-00016 #include <string.h>
-00017 #include "antiword.h"
-00018 
-00019 struct interval {
-00020         USHORT  first;
-00021         USHORT  last;
-00022 };
-00023 /* Sorted list of non-overlapping intervals of non-spacing characters */
-00024 static const struct interval combining[] = {
-00025         { 0x0300, 0x034E }, { 0x0360, 0x0362 }, { 0x0483, 0x0486 },
-00026         { 0x0488, 0x0489 }, { 0x0591, 0x05A1 }, { 0x05A3, 0x05B9 },
-00027         { 0x05BB, 0x05BD }, { 0x05BF, 0x05BF }, { 0x05C1, 0x05C2 },
-00028         { 0x05C4, 0x05C4 }, { 0x064B, 0x0655 }, { 0x0670, 0x0670 },
-00029         { 0x06D6, 0x06E4 }, { 0x06E7, 0x06E8 }, { 0x06EA, 0x06ED },
-00030         { 0x070F, 0x070F }, { 0x0711, 0x0711 }, { 0x0730, 0x074A },
-00031         { 0x07A6, 0x07B0 }, { 0x0901, 0x0902 }, { 0x093C, 0x093C },
-00032         { 0x0941, 0x0948 }, { 0x094D, 0x094D }, { 0x0951, 0x0954 },
-00033         { 0x0962, 0x0963 }, { 0x0981, 0x0981 }, { 0x09BC, 0x09BC },
-00034         { 0x09C1, 0x09C4 }, { 0x09CD, 0x09CD }, { 0x09E2, 0x09E3 },
-00035         { 0x0A02, 0x0A02 }, { 0x0A3C, 0x0A3C }, { 0x0A41, 0x0A42 },
-00036         { 0x0A47, 0x0A48 }, { 0x0A4B, 0x0A4D }, { 0x0A70, 0x0A71 },
-00037         { 0x0A81, 0x0A82 }, { 0x0ABC, 0x0ABC }, { 0x0AC1, 0x0AC5 },
-00038         { 0x0AC7, 0x0AC8 }, { 0x0ACD, 0x0ACD }, { 0x0B01, 0x0B01 },
-00039         { 0x0B3C, 0x0B3C }, { 0x0B3F, 0x0B3F }, { 0x0B41, 0x0B43 },
-00040         { 0x0B4D, 0x0B4D }, { 0x0B56, 0x0B56 }, { 0x0B82, 0x0B82 },
-00041         { 0x0BC0, 0x0BC0 }, { 0x0BCD, 0x0BCD }, { 0x0C3E, 0x0C40 },
-00042         { 0x0C46, 0x0C48 }, { 0x0C4A, 0x0C4D }, { 0x0C55, 0x0C56 },
-00043         { 0x0CBF, 0x0CBF }, { 0x0CC6, 0x0CC6 }, { 0x0CCC, 0x0CCD },
-00044         { 0x0D41, 0x0D43 }, { 0x0D4D, 0x0D4D }, { 0x0DCA, 0x0DCA },
-00045         { 0x0DD2, 0x0DD4 }, { 0x0DD6, 0x0DD6 }, { 0x0E31, 0x0E31 },
-00046         { 0x0E34, 0x0E3A }, { 0x0E47, 0x0E4E }, { 0x0EB1, 0x0EB1 },
-00047         { 0x0EB4, 0x0EB9 }, { 0x0EBB, 0x0EBC }, { 0x0EC8, 0x0ECD },
-00048         { 0x0F18, 0x0F19 }, { 0x0F35, 0x0F35 }, { 0x0F37, 0x0F37 },
-00049         { 0x0F39, 0x0F39 }, { 0x0F71, 0x0F7E }, { 0x0F80, 0x0F84 },
-00050         { 0x0F86, 0x0F87 }, { 0x0F90, 0x0F97 }, { 0x0F99, 0x0FBC },
-00051         { 0x0FC6, 0x0FC6 }, { 0x102D, 0x1030 }, { 0x1032, 0x1032 },
-00052         { 0x1036, 0x1037 }, { 0x1039, 0x1039 }, { 0x1058, 0x1059 },
-00053         { 0x1160, 0x11FF }, { 0x17B7, 0x17BD }, { 0x17C6, 0x17C6 },
-00054         { 0x17C9, 0x17D3 }, { 0x180B, 0x180E }, { 0x18A9, 0x18A9 },
-00055         { 0x200B, 0x200F }, { 0x202A, 0x202E }, { 0x206A, 0x206F },
-00056         { 0x20D0, 0x20E3 }, { 0x302A, 0x302F }, { 0x3099, 0x309A },
-00057         { 0xFB1E, 0xFB1E }, { 0xFE20, 0xFE23 }, { 0xFEFF, 0xFEFF },
-00058         { 0xFFF9, 0xFFFB }
-00059 };
-00060 
-00061 /* Auxiliary function for binary search in interval table */
-00062 static BOOL
-00063 bIsZeroWidthChar(ULONG ucs)
-00064 {
-00065         int low = 0;
-00066         int high = elementsof(combining) - 1;
-00067         int mid;
-00068 
-00069         if (ucs < (ULONG)combining[low].first ||
-00070             ucs > (ULONG)combining[high].last) {
-00071                 return FALSE;
-00072         }
-00073 
-00074         while (high >= low) {
-00075                 mid = (low + high) / 2;
-00076                 if (ucs > (ULONG)combining[mid].last) {
-00077                         low = mid + 1;
-00078                 } else if (ucs < (ULONG)combining[mid].first) {
-00079                         high = mid - 1;
-00080                 } else {
-00081                         return TRUE;
-00082                 }
-00083         }
-00084         return FALSE;
-00085 } /* end of bIsZeroWidthChar */
-00086 
-00087 /* The following functions define the column width of an ISO 10646
-00088  * character as follows:
-00089  *
-00090  *    - The null character (U+0000) has a column width of 0.
-00091  *
-00092  *    - Other C0/C1 control characters and DEL will lead to a return
-00093  *      value of -1.
-00094  *
-00095  *    - Non-spacing and enclosing combining characters (general
-00096  *      category code Mn or Me in the Unicode database) have a
-00097  *      column width of 0.
-00098  *
-00099  *    - Other format characters (general category code Cf in the Unicode
-00100  *      database) and ZERO WIDTH SPACE (U+200B) have a column width of 0.
-00101  *
-00102  *    - Hangul Jamo medial vowels and final consonants (U+1160-U+11FF)
-00103  *      have a column width of 0.
-00104  *
-00105  *    - Spacing characters in the East Asian Wide (W) or East Asian
-00106  *      FullWidth (F) category as defined in Unicode Technical
-00107  *      Report #11 have a column width of 2.
-00108  *
-00109  *    - All remaining characters (including all printable
-00110  *      ISO 8859-1 and WGL4 characters, Unicode control characters,
-00111  *      etc.) have a column width of 1.
-00112  *
-00113  * This implementation assumes that all characters are encoded
-00114  * in ISO 10646.
-00115  *
-00116  * This function is not named wcwidth() to prevent name clashes
-00117  */
-00118 static int
-00119 iWcWidth(ULONG ucs)
-00120 {
-00121         /* Test for 8-bit control characters */
-00122         if (ucs == 0) {
-00123                 return 0;
-00124         }
-00125         if (ucs < 0x20 || (ucs >= 0x7f && ucs < 0xa0)) {
-00126                 NO_DBG_HEX(ucs);
-00127                 return -1;
-00128         }
-00129 
-00130         /* Binary search in table of non-spacing characters */
-00131         if (bIsZeroWidthChar(ucs)) {
-00132                 return 0;
-00133         }
-00134 
-00135         /* Ucs is not a combining or C0/C1 control character */
-00136 
-00137         return 1 +
-00138         (ucs >= 0x1100 &&
-00139          (ucs <= 0x115f ||                    /* Hangul Jamo init. consonants */
-00140           (ucs >= 0x2e80 && ucs <= 0xa4cf && (ucs & ~0x0011) != 0x300a &&
-00141            ucs != 0x303f) ||                  /* CJK ... Yi */
-00142           (ucs >= 0xac00 && ucs <= 0xd7a3) || /* Hangul Syllables */
-00143           (ucs >= 0xf900 && ucs <= 0xfaff) || /* CJK Compatibility Ideographs */
-00144           (ucs >= 0xfe30 && ucs <= 0xfe6f) || /* CJK Compatibility Forms */
-00145           (ucs >= 0xff00 && ucs <= 0xff5f) || /* Fullwidth Forms */
-00146           (ucs >= 0xffe0 && ucs <= 0xffe6) ||
-00147           (ucs >= 0x20000 && ucs <= 0x2ffff)));
-00148 } /* end of iWcWidth */
-00149 
-00150 /*
-00151  * utf8_to_ucs - convert from UTF-8 to UCS
-00152  *
-00153  * Returns the UCS character,
-00154  * Fills in the number of bytes in the UTF-8 character
-00155  */
-00156 static ULONG
-00157 utf8_to_ucs(const char *p, int iStrLen, int *piUtfLen)
-00158 {
-00159         ULONG   ulUcs;
-00160         int     iIndex, iCharLen;
-00161 
-00162         fail(p == NULL || piUtfLen == NULL);
-00163         fail(iStrLen < 1);
-00164 
-00165         ulUcs = (ULONG)(UCHAR)p[0];
-00166 
-00167         if (ulUcs < 0x80) {
-00168                 *piUtfLen = 1;
-00169                 return ulUcs;
-00170         }
-00171 
-00172         if (ulUcs < 0xe0){
-00173                 iCharLen = 2;
-00174                 ulUcs &= 0x1f;
-00175         } else if (ulUcs < 0xf0){
-00176                 iCharLen = 3;
-00177                 ulUcs &= 0x0f;
-00178         } else if (ulUcs < 0xf8){
-00179                 iCharLen = 4;
-00180                 ulUcs &= 0x07;
-00181         } else if (ulUcs < 0xfc){
-00182                 iCharLen = 5;
-00183                 ulUcs &= 0x03;
-00184         } else {
-00185                 iCharLen = 6;
-00186                 ulUcs &= 0x01;
-00187         }
-00188         for (iIndex = 1; iIndex < iCharLen; iIndex++) {
-00189                 ulUcs <<= 6;
-00190                 if (iIndex < iStrLen) {
-00191                         ulUcs |= (ULONG)(UCHAR)p[iIndex] & 0x3f;
-00192                 }
-00193         }
-00194         *piUtfLen = iCharLen;
-00195         return ulUcs;
-00196 } /* end of utf8_to_ucs */
-00197 
-00198 /*
-00199  * utf8_strwidth - compute the string width of an UTF-8 string
-00200  *
-00201  * Returns the string width in columns
-00202  */
-00203 long
-00204 utf8_strwidth(const char *pcString, size_t tNumchars)
-00205 {
-00206         ULONG   ulUcs;
-00207         long    lTotal;
-00208         int     iToGo, iWidth, iUtflen;
-00209 
-00210         fail(pcString == NULL || tNumchars > (size_t)INT_MAX);
-00211 
-00212         lTotal = 0;
-00213         iToGo = (int)tNumchars;
-00214 
-00215         while (iToGo > 0 && *pcString != '\0') {
-00216                 ulUcs = utf8_to_ucs(pcString, iToGo, &iUtflen);
-00217                 iWidth = iWcWidth(ulUcs);
-00218                 if (iWidth > 0) {
-00219                         lTotal += iWidth;
-00220                 }
-00221                 pcString += iUtflen;
-00222                 iToGo -= iUtflen;
-00223         }
-00224         NO_DBG_DEC(lTotal);
-00225         return lTotal;
-00226 } /* end of utf8_strwidth */
-00227 
-00228 /*
-00229  * utf8_chrlength - get the number of bytes in an UTF-8 character
-00230  *
-00231  * Returns the number of bytes
-00232  */
-00233 int
-00234 utf8_chrlength(const char *p)
-00235 {
-00236         int     iUtflen;
-00237 
-00238         fail(p == NULL);
-00239 
-00240         iUtflen = -1;           /* Just to make sure */
-00241         (void)utf8_to_ucs(p, INT_MAX, &iUtflen);
-00242         NO_DBG_DEC(iUtflen);
-00243         return iUtflen;
-00244 } /* end of utf8_chrlength */
-00245 
-00246 /*
-00247  * is_locale_utf8 - return TRUE if the locale is UTF-8
-00248  */
-00249 BOOL
-00250 is_locale_utf8(void)
-00251 {
-00252         char    szCodeset[20];
-00253 
-00254         szCodeset[0] = '\0';
-00255         if (!bGetNormalizedCodeset(szCodeset, sizeof(szCodeset), NULL)) {
-00256                 return FALSE;
-00257         }
-00258         DBG_MSG(szCodeset);
-00259         return STREQ(szCodeset, "utf8");
-00260 } /* end of is_locale_utf8 */
-