about summary refs log tree commit diff
path: root/iconvdata/ibm937.c
blob: 98e9683253c69e64ee1444098863fd5effcb9651 (plain) (blame)
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
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
/* Conversion to and from IBM937.
   Copyright (C) 2000 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Masahide Washizawa <washi@yamato.ibm.co.jp>, 2000.

   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 <dlfcn.h>
#include <stdint.h>
#include <wchar.h>
#include <byteswap.h>
#include "ibm937.h"

/* The shift sequences for this charset (it does not use ESC).  */
#define SI 		0x0F  /* Shift In, host code to turn DBCS off.  */
#define SO 		0x0E  /* Shift Out, host code to turn DBCS on.  */

/* Definitions used in the body of the `gconv' function.  */
#define CHARSET_NAME	"IBM937//"
#define FROM_LOOP	from_ibm937
#define TO_LOOP		to_ibm937

/* Definitions of initialization and destructor function.  */
#define DEFINE_INIT	1
#define DEFINE_FINI	1

#define MIN_NEEDED_FROM	1
#define MIN_NEEDED_TO	4

/* Current codeset type.  */
enum
{
  init = 0,
  sb,
  db
};

/* First, define the conversion function from IBM-937 to UCS4.  */
#define MIN_NEEDED_INPUT  	MIN_NEEDED_FROM
#define MIN_NEEDED_OUTPUT 	MIN_NEEDED_TO
#define INIT_PARAMS 		int curcs = init;
#define LOOPFCT 		FROM_LOOP
#define BODY \
  {									      \
    uint32_t ch = *inptr;						      \
									      \
    if (__builtin_expect (ch, 0) == SO)					      \
      {									      \
	if (__builtin_expect (inptr + 1 >= inend, 0))			      \
	  {								      \
	    result = __GCONV_INCOMPLETE_INPUT;				      \
	    break;							      \
	  }								      \
									      \
	/* Shift OUT, change to DBCS converter.  */			      \
	if (curcs == db)						      \
	  {								      \
	    result = __GCONV_ILLEGAL_INPUT;				      \
	    break;							      \
	  }								      \
	curcs = db;							      \
	++inptr;							      \
	ch = *inptr;							      \
      }									      \
    else if (__builtin_expect (ch, 0) == SI)				      \
      {									      \
	if (__builtin_expect (inptr + 1 >= inend, 0))			      \
	  {								      \
	    result = __GCONV_INCOMPLETE_INPUT;				      \
	    break;							      \
	  }								      \
									      \
	/* Shift IN, change to SBCS converter.  */			      \
	if (curcs == sb)						      \
	  {								      \
	    result = __GCONV_ILLEGAL_INPUT;				      \
	    break;							      \
	  }								      \
	curcs = sb;							      \
	++inptr;							      \
	ch = *inptr;							      \
      }									      \
									      \
    if (curcs == sb || curcs == init)					      \
      {									      \
	/* Use the UCS4 table for single byte.  */			      \
	ch = __ibm937sb_to_ucs4[ch];					      \
	if (__builtin_expect (ch, L'\1') == L'\0' && *inptr != '\0')	      \
	  {								      \
	    /* This is an illegal character.  */			      \
	    if (! ignore_errors_p ())					      \
	      {								      \
		result = __GCONV_ILLEGAL_INPUT;				      \
		break;							      \
	      }								      \
	    ++*irreversible;						      \
	    ++inptr;							      \
	    continue;							      \
	  }								      \
	else								      \
	  {								      \
	    put32 (outptr, ch);						      \
	    outptr += 4;						      \
	    inptr++;							      \
	  }								      \
      }									      \
    else if (curcs == db)						      \
      {									      \
	/* Use the IBM937 table for double byte.  */			      \
	ch = ibm937db_to_ucs4(inptr[0], inptr[1]);			      \
	if (__builtin_expect (ch, L'\1') == L'\0' && *inptr != '\0')	      \
	  {								      \
	    /* This is an illegal character.  */			      \
	    if (! ignore_errors_p ())					      \
	      {								      \
		result = __GCONV_ILLEGAL_INPUT;				      \
		break;							      \
	      }								      \
	    ++*irreversible;						      \
	    inptr += 2;							      \
	    continue;							      \
	  }								      \
	else								      \
	  {								      \
	    put32 (outptr, ch);						      \
	    outptr += 4;						      \
	    inptr += 2;							      \
	  }								      \
      }									      \
  }
#define LOOP_NEED_FLAGS
#include <iconv/loop.c>

/* Next, define the other direction.  */
#define MIN_NEEDED_INPUT	MIN_NEEDED_TO
#define MIN_NEEDED_OUTPUT	MIN_NEEDED_FROM
#define INIT_PARAMS 		int curcs = init;
#define LOOPFCT			TO_LOOP
#define BODY \
  {									      \
    uint32_t ch = get32 (inptr);					      \
    const char *cp;							      \
									      \
    /* Use the UCS4 table for single byte.  */				      \
    cp = __ucs4_to_ibm937sb[ch];					      \
    if (__builtin_expect (ch >= sizeof (__ucs4_to_ibm937sb)		      \
			  / sizeof (__ucs4_to_ibm937sb[0]), 0)		      \
	|| (__builtin_expect (cp[0], '\1') == '\0' && ch != 0))		      \
      {									      \
	/* Use the UCS4 table for double byte.  */			      \
	cp = __ucs4_to_ibm937db[ch];					      \
	if (__builtin_expect (cp[0], '\1') == '\0' && ch != 0)		      \
	  {								      \
	    /* This is an illegal character.  */			      \
	    if (! ignore_errors_p ())					      \
	      {								      \
		result = __GCONV_ILLEGAL_INPUT;				      \
		break;							      \
	      }								      \
	    ++*irreversible;						      \
	  }								      \
	else								      \
	  {								      \
	    if (curcs == init || curcs == sb)				      \
	      {								      \
		*outptr++ = SO;						      \
		if (__builtin_expect (outptr == outend, 0))		      \
		  {							      \
		    result = __GCONV_FULL_OUTPUT;			      \
		    break;						      \
		  }							      \
		curcs = db;						      \
	      }								      \
	    *outptr++ = cp[0];						      \
	    *outptr++ = cp[1];						      \
	  }								      \
      }									      \
    else								      \
      {									      \
	if (curcs == db)						      \
	  {								      \
	    *outptr++ = SI;						      \
	    if (__builtin_expect (outptr == outend, 0))			      \
	      {								      \
		result = __GCONV_FULL_OUTPUT;				      \
		break;							      \
	      }								      \
	  }								      \
	curcs = sb;							      \
	*outptr++ = cp[0];						      \
      }									      \
									      \
    /* Now that we wrote the output increment the input pointer.  */	      \
    inptr += 4;								      \
  }
#define LOOP_NEED_FLAGS
#include <iconv/loop.c>

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