aboutsummaryrefslogtreecommitdiff
path: root/iconvdata/unicode.c
blob: 7f2aca51b49f2c70fb1bb063d6c1b6788c2fb37d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
/* Conversion module for Unicode
   Copyright (C) 1999, 2000 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1999.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include <byteswap.h>
#include <gconv.h>
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>

/* This is the Byte Order Mark character (BOM).  */
#define BOM	0xfeff
/* And in the other endian format.  */
#define BOM_OE	0xfffe


/* Definitions used in the body of the `gconv' function.  */
#define FROM_LOOP		from_unicode_loop
#define TO_LOOP			to_unicode_loop
#define DEFINE_INIT		0
#define DEFINE_FINI		0
#define MIN_NEEDED_FROM		2
#define MIN_NEEDED_TO		4
#define FROM_DIRECTION		(dir == from_unicode)
#define PREPARE_LOOP \
  enum direction dir = ((struct unicode_data *) step->__data)->dir;	      \
  int swap;								      \
  if (FROM_DIRECTION)							      \
    {									      \
      if (data->__invocation_counter == 0)				      \
	{								      \
	  /* We have to find out which byte order the file is encoded in.  */ \
	  if (inptr + 2 > inend)					      \
	    return __GCONV_EMPTY_INPUT;					      \
									      \
	  if (get16u (inptr) == BOM)					      \
	    /* Simply ignore the BOM character.  */			      \
	    inptr += 2;							      \
	  else if (get16u (inptr) == BOM_OE)				      \
	    {								      \
	      ((struct unicode_data *) step->__data)->swap = 1;		      \
	      inptr += 2;						      \
	    }								      \
	}								      \
    }									      \
  else if (!data->__internal_use && data->__invocation_counter == 0)	      \
    {									      \
      /* Emit the Byte Order Mark.  */					      \
      if (outbuf + 2 > outend)						      \
	return __GCONV_FULL_OUTPUT;					      \
									      \
      put16u (outbuf, BOM);						      \
      outbuf += 2;							      \
    }									      \
  swap = ((struct unicode_data *) step->__data)->swap;
#define EXTRA_LOOP_ARGS		, data, swap


/* Direction of the transformation.  */
enum direction
{
  illegal_dir,
  to_unicode,
  from_unicode
};

struct unicode_data
{
  enum direction dir;
  int swap;
};


int
gconv_init (struct __gconv_step *step)
{
  /* Determine which direction.  */
  struct unicode_data *new_data;
  enum direction dir = illegal_dir;
  int result;

  if (__strcasecmp (step->__from_name, "UNICODE") == 0)
    dir = from_unicode;
  else
    dir = to_unicode;

  new_data = (struct unicode_data *) malloc (sizeof (struct unicode_data));

  result = __GCONV_NOMEM;
  if (new_data != NULL)
    {
      new_data->dir = dir;
      new_data->swap = 0;
      step->__data = new_data;

      if (dir == from_unicode)
	{
	  step->__min_needed_from = MIN_NEEDED_FROM;
	  step->__max_needed_from = MIN_NEEDED_FROM;
	  step->__min_needed_to = MIN_NEEDED_TO;
	  step->__max_needed_to = MIN_NEEDED_TO;
	}
      else
	{
	  step->__min_needed_from = MIN_NEEDED_TO;
	  step->__max_needed_from = MIN_NEEDED_TO;
	  step->__min_needed_to = MIN_NEEDED_FROM;
	  step->__max_needed_to = MIN_NEEDED_FROM;
	}

      step->__stateful = 0;

      result = __GCONV_OK;
    }

  return result;
}


void
gconv_end (struct __gconv_step *data)
{
  free (data->__data);
}


/* Convert from the internal (UCS4-like) format to UCS2.  */
#define MIN_NEEDED_INPUT	MIN_NEEDED_TO
#define MIN_NEEDED_OUTPUT	MIN_NEEDED_FROM
#define LOOPFCT			TO_LOOP
#define BODY \
  {									      \
    uint32_t c = get32 (inptr);						      \
									      \
    if (c >= 0x10000)							      \
      {									      \
	if (! ignore_errors_p ())					      \
	  {								      \
	    /* This is an illegal character.  */			      \
	    result = __GCONV_ILLEGAL_INPUT;				      \
	    break;							      \
	  }								      \
									      \
	++*converted;							      \
      }									      \
    else								      \
      {									      \
	put16 (outptr, c);						      \
	outptr += 2;							      \
      }									      \
									      \
    inptr += 4;								      \
  }
#define EXTRA_LOOP_DECLS \
	, struct __gconv_step_data *step_data, int swap
#include <iconv/loop.c>


/* Convert from UCS2 to the internal (UCS4-like) format.  */
#define MIN_NEEDED_INPUT	MIN_NEEDED_FROM
#define MIN_NEEDED_OUTPUT	MIN_NEEDED_TO
#define LOOPFCT			FROM_LOOP
#define BODY \
  {									      \
    uint16_t u1 = get16 (inptr);					      \
									      \
    if (swap)								      \
      u1 = bswap_16 (u1);						      \
									      \
    put32 (outptr, u1);							      \
									      \
    inptr += 2;								      \
    outptr += 4;							      \
  }
#define EXTRA_LOOP_DECLS \
	, struct __gconv_step_data *step_data, int swap
#include <iconv/loop.c>


/* Now define the toplevel functions.  */
#include <iconv/skeleton.c>