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
28static int
29java_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;
92simply_backslash:
93  *pwc = '\\';
94  return 1;
95}
96
97static int
98java_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}
138