examples/PIPS/antiword/src/utf8.c

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 */

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