release/src/router/libiconv/lib/java.h

   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 }