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libiconv

    1: /*
    2:  * Copyright (C) 1999-2002 Free Software Foundation, Inc.
    3:  * This file is part of the GNU LIBICONV Library.
    4:  *
    5:  * The GNU LIBICONV Library is free software; you can redistribute it
    6:  * and/or modify it under the terms of the GNU Library General Public
    7:  * License as published by the Free Software Foundation; either version 2
    8:  * of the License, or (at your option) any later version.
    9:  *
   10:  * The GNU LIBICONV Library is distributed in the hope that it will be
   11:  * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
   12:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   13:  * Library General Public License for more details.
   14:  *
   15:  * You should have received a copy of the GNU Library General Public
   16:  * License along with the GNU LIBICONV Library; see the file COPYING.LIB.
   17:  * If not, write to the Free Software Foundation, Inc., 51 Franklin Street,
   18:  * Fifth Floor, Boston, MA 02110-1301, USA.
   19:  */
   20: 
   21: /*
   22:  * JAVA
   23:  * This is ISO 8859-1 with \uXXXX escape sequences, denoting Unicode BMP
   24:  * characters. Consecutive pairs of \uXXXX escape sequences in the surrogate
   25:  * range, as in UTF-16, denote Unicode characters outside the BMP.
   26:  */
   27: 
   28: static int
   29: java_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
   30: {
   31:   unsigned char c;
   32:   ucs4_t wc, wc2;
   33:   int i;
   34: 
   35:   c = s[0];
   36:   if (c != '\\') {
   37:     *pwc = c;
   38:     return 1;
   39:   }
   40:   if (n < 2)
   41:     return RET_TOOFEW(0);
   42:   if (s[1] != 'u')
   43:     goto simply_backslash;
   44:   wc = 0;
   45:   for (i = 2; i < 6; i++) {
   46:     if (n <= i)
   47:       return RET_TOOFEW(0);
   48:     c = s[i];
   49:     if (c >= '0' && c <= '9')
   50:       c -= '0';
   51:     else if (c >= 'A' && c <= 'Z')
   52:       c -= 'A'-10;
   53:     else if (c >= 'a' && c <= 'z')
   54:       c -= 'a'-10;
   55:     else
   56:       goto simply_backslash;
   57:     wc |= (ucs4_t) c << (4 * (5-i));
   58:   }
   59:   if (!(wc >= 0xd800 && wc < 0xe000)) {
   60:     *pwc = wc;
   61:     return 6;
   62:   }
   63:   if (wc >= 0xdc00)
   64:     goto simply_backslash;
   65:   if (n < 7)
   66:     return RET_TOOFEW(0);
   67:   if (s[6] != '\\')
   68:     goto simply_backslash;
   69:   if (n < 8)
   70:     return RET_TOOFEW(0);
   71:   if (s[7] != 'u')
   72:     goto simply_backslash;
   73:   wc2 = 0;
   74:   for (i = 8; i < 12; i++) {
   75:     if (n <= i)
   76:       return RET_TOOFEW(0);
   77:     c = s[i];
   78:     if (c >= '0' && c <= '9')
   79:       c -= '0';
   80:     else if (c >= 'A' && c <= 'Z')
   81:       c -= 'A'-10;
   82:     else if (c >= 'a' && c <= 'z')
   83:       c -= 'a'-10;
   84:     else
   85:       goto simply_backslash;
   86:     wc2 |= (ucs4_t) c << (4 * (11-i));
   87:   }
   88:   if (!(wc2 >= 0xdc00 && wc2 < 0xe000))
   89:     goto simply_backslash;
   90:   *pwc = 0x10000 + ((wc - 0xd800) << 10) + (wc2 - 0xdc00);
   91:   return 12;
   92: simply_backslash:
   93:   *pwc = '\\';
   94:   return 1;
   95: }
   96: 
   97: static int
   98: java_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
   99: {
  100:   if (wc < 0x80) {
  101:     *r = wc;
  102:     return 1;
  103:   } else if (wc < 0x10000) {
  104:     if (n >= 6) {
  105:       unsigned int i;
  106:       r[0] = '\\';
  107:       r[1] = 'u';
  108:       i = (wc >> 12) & 0x0f; r[2] = (i < 10 ? '0'+i : 'a'-10+i);
  109:       i = (wc >> 8) & 0x0f;  r[3] = (i < 10 ? '0'+i : 'a'-10+i);
  110:       i = (wc >> 4) & 0x0f;  r[4] = (i < 10 ? '0'+i : 'a'-10+i);
  111:       i = wc & 0x0f;         r[5] = (i < 10 ? '0'+i : 'a'-10+i);
  112:       return 6;
  113:     } else
  114:       return RET_TOOSMALL;
  115:   } else if (wc < 0x110000) {
  116:     if (n >= 12) {
  117:       ucs4_t wc1 = 0xd800 + ((wc - 0x10000) >> 10);
  118:       ucs4_t wc2 = 0xdc00 + ((wc - 0x10000) & 0x3ff);
  119:       unsigned int i;
  120:       r[0] = '\\';
  121:       r[1] = 'u';
  122:       i = (wc1 >> 12) & 0x0f; r[2] = (i < 10 ? '0'+i : 'a'-10+i);
  123:       i = (wc1 >> 8) & 0x0f;  r[3] = (i < 10 ? '0'+i : 'a'-10+i);
  124:       i = (wc1 >> 4) & 0x0f;  r[4] = (i < 10 ? '0'+i : 'a'-10+i);
  125:       i = wc1 & 0x0f;         r[5] = (i < 10 ? '0'+i : 'a'-10+i);
  126:       r[6] = '\\';
  127:       r[7] = 'u';
  128:       i = (wc2 >> 12) & 0x0f; r[8] = (i < 10 ? '0'+i : 'a'-10+i);
  129:       i = (wc2 >> 8) & 0x0f;  r[9] = (i < 10 ? '0'+i : 'a'-10+i);
  130:       i = (wc2 >> 4) & 0x0f; r[10] = (i < 10 ? '0'+i : 'a'-10+i);
  131:       i = wc2 & 0x0f;        r[11] = (i < 10 ? '0'+i : 'a'-10+i);
  132:       return 12;
  133:     } else
  134:       return RET_TOOSMALL;
  135:   }
  136:   return RET_ILUNI;
  137: }