1 /*
2  * "streamable kanji code filter and converter"
3  * Copyright (c) 1998-2002 HappySize, Inc. All rights reserved.
4  *
5  * LICENSE NOTICES
6  *
7  * This file is part of "streamable kanji code filter and converter",
8  * which is distributed under the terms of GNU Lesser General Public
9  * License (version 2) as published by the Free Software Foundation.
10  *
11  * This software is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  * GNU Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with "streamable kanji code filter and converter";
18  * if not, write to the Free Software Foundation, Inc., 59 Temple Place,
19  * Suite 330, Boston, MA  02111-1307  USA
20  *
21  * The author of this file:
22  *
23  */
24 /*
25  * The source code included in this files was separated from mbfilter.c
26  * by moriyoshi koizumi <moriyoshi@php.net> on 4 dec 2002.
27  *
28  */
29 
30 #ifdef HAVE_CONFIG_H
31 #include "config.h"
32 #endif
33 
34 #include "mbfilter.h"
35 #include "mbfilter_ucs2.h"
36 
37 static const char *mbfl_encoding_ucs2_aliases[] = {"ISO-10646-UCS-2", "UCS2" , "UNICODE", NULL};
38 
39 const mbfl_encoding mbfl_encoding_ucs2 = {
40 	mbfl_no_encoding_ucs2,
41 	"UCS-2",
42 	"UCS-2",
43 	(const char *(*)[])&mbfl_encoding_ucs2_aliases,
44 	NULL,
45 	MBFL_ENCTYPE_WCS2BE,
46 	&vtbl_ucs2_wchar,
47 	&vtbl_wchar_ucs2
48 };
49 
50 const mbfl_encoding mbfl_encoding_ucs2be = {
51 	mbfl_no_encoding_ucs2be,
52 	"UCS-2BE",
53 	"UCS-2BE",
54 	NULL,
55 	NULL,
56 	MBFL_ENCTYPE_WCS2BE,
57 	&vtbl_ucs2be_wchar,
58 	&vtbl_wchar_ucs2be
59 };
60 
61 const mbfl_encoding mbfl_encoding_ucs2le = {
62 	mbfl_no_encoding_ucs2le,
63 	"UCS-2LE",
64 	"UCS-2LE",
65 	NULL,
66 	NULL,
67 	MBFL_ENCTYPE_WCS2LE,
68 	&vtbl_ucs2le_wchar,
69 	&vtbl_wchar_ucs2le
70 };
71 
72 const struct mbfl_convert_vtbl vtbl_ucs2_wchar = {
73 	mbfl_no_encoding_ucs2,
74 	mbfl_no_encoding_wchar,
75 	mbfl_filt_conv_common_ctor,
76 	mbfl_filt_conv_common_dtor,
77 	mbfl_filt_conv_ucs2_wchar,
78 	mbfl_filt_conv_common_flush
79 };
80 
81 const struct mbfl_convert_vtbl vtbl_wchar_ucs2 = {
82 	mbfl_no_encoding_wchar,
83 	mbfl_no_encoding_ucs2,
84 	mbfl_filt_conv_common_ctor,
85 	mbfl_filt_conv_common_dtor,
86 	mbfl_filt_conv_wchar_ucs2be,
87 	mbfl_filt_conv_common_flush
88 };
89 
90 const struct mbfl_convert_vtbl vtbl_ucs2be_wchar = {
91 	mbfl_no_encoding_ucs2be,
92 	mbfl_no_encoding_wchar,
93 	mbfl_filt_conv_common_ctor,
94 	mbfl_filt_conv_common_dtor,
95 	mbfl_filt_conv_ucs2be_wchar,
96 	mbfl_filt_conv_common_flush
97 };
98 
99 const struct mbfl_convert_vtbl vtbl_wchar_ucs2be = {
100 	mbfl_no_encoding_wchar,
101 	mbfl_no_encoding_ucs2be,
102 	mbfl_filt_conv_common_ctor,
103 	mbfl_filt_conv_common_dtor,
104 	mbfl_filt_conv_wchar_ucs2be,
105 	mbfl_filt_conv_common_flush
106 };
107 
108 const struct mbfl_convert_vtbl vtbl_ucs2le_wchar = {
109 	mbfl_no_encoding_ucs2le,
110 	mbfl_no_encoding_wchar,
111 	mbfl_filt_conv_common_ctor,
112 	mbfl_filt_conv_common_dtor,
113 	mbfl_filt_conv_ucs2le_wchar,
114 	mbfl_filt_conv_common_flush
115 };
116 
117 const struct mbfl_convert_vtbl vtbl_wchar_ucs2le = {
118 	mbfl_no_encoding_wchar,
119 	mbfl_no_encoding_ucs2le,
120 	mbfl_filt_conv_common_ctor,
121 	mbfl_filt_conv_common_dtor,
122 	mbfl_filt_conv_wchar_ucs2le,
123 	mbfl_filt_conv_common_flush
124 };
125 
126 #define CK(statement)	do { if ((statement) < 0) return (-1); } while (0)
127 
128 /*
129  * UCS-2 => wchar
130  */
mbfl_filt_conv_ucs2_wchar(int c,mbfl_convert_filter * filter)131 int mbfl_filt_conv_ucs2_wchar(int c, mbfl_convert_filter *filter)
132 {
133 	int n, endian;
134 
135 	endian = filter->status & 0xff00;
136 	switch (filter->status & 0xff) {
137 	case 0:
138 		if (endian) {
139 			n = c & 0xff;
140 		} else {
141 			n = (c & 0xff) << 8;
142 		}
143 		filter->cache = n;
144 		filter->status++;
145 		break;
146 	default:
147 		if (endian) {
148 			n = (c & 0xff) << 8;
149 		} else {
150 			n = c & 0xff;
151 		}
152 		n |= filter->cache;
153 		if (n == 0xfffe) {
154 			if (endian) {
155 				filter->status = 0;		/* big-endian */
156 			} else {
157 				filter->status = 0x100;		/* little-endian */
158 			}
159 			CK((*filter->output_function)(0xfeff, filter->data));
160 		} else {
161 			filter->status &= ~0xff;
162 			CK((*filter->output_function)(n, filter->data));
163 		}
164 		break;
165 	}
166 
167 	return c;
168 }
169 
170 /*
171  * UCS-2BE => wchar
172  */
mbfl_filt_conv_ucs2be_wchar(int c,mbfl_convert_filter * filter)173 int mbfl_filt_conv_ucs2be_wchar(int c, mbfl_convert_filter *filter)
174 {
175 	int n;
176 
177 	if (filter->status == 0) {
178 		filter->status = 1;
179 		n = (c & 0xff) << 8;
180 		filter->cache = n;
181 	} else {
182 		filter->status = 0;
183 		n = (c & 0xff) | filter->cache;
184 		CK((*filter->output_function)(n, filter->data));
185 	}
186 	return c;
187 }
188 
189 /*
190  * wchar => UCS-2BE
191  */
mbfl_filt_conv_wchar_ucs2be(int c,mbfl_convert_filter * filter)192 int mbfl_filt_conv_wchar_ucs2be(int c, mbfl_convert_filter *filter)
193 {
194 	if (c >= 0 && c < MBFL_WCSPLANE_UCS2MAX) {
195 		CK((*filter->output_function)((c >> 8) & 0xff, filter->data));
196 		CK((*filter->output_function)(c & 0xff, filter->data));
197 	} else {
198 		if (filter->illegal_mode != MBFL_OUTPUTFILTER_ILLEGAL_MODE_NONE) {
199 			CK(mbfl_filt_conv_illegal_output(c, filter));
200 		}
201 	}
202 
203 	return c;
204 }
205 
206 /*
207  * UCS-2LE => wchar
208  */
mbfl_filt_conv_ucs2le_wchar(int c,mbfl_convert_filter * filter)209 int mbfl_filt_conv_ucs2le_wchar(int c, mbfl_convert_filter *filter)
210 {
211 	int n;
212 
213 	if (filter->status == 0) {
214 		filter->status = 1;
215 		n = c & 0xff;
216 		filter->cache = n;
217 	} else {
218 		filter->status = 0;
219 		n = ((c & 0xff) << 8) | filter->cache;
220 		CK((*filter->output_function)(n, filter->data));
221 	}
222 	return c;
223 }
224 
225 
226 /*
227  * wchar => UCS-2LE
228  */
mbfl_filt_conv_wchar_ucs2le(int c,mbfl_convert_filter * filter)229 int mbfl_filt_conv_wchar_ucs2le(int c, mbfl_convert_filter *filter)
230 {
231 	if (c >= 0 && c < MBFL_WCSPLANE_UCS2MAX) {
232 		CK((*filter->output_function)(c & 0xff, filter->data));
233 		CK((*filter->output_function)((c >> 8) & 0xff, filter->data));
234 	} else {
235 		if (filter->illegal_mode != MBFL_OUTPUTFILTER_ILLEGAL_MODE_NONE) {
236 			CK(mbfl_filt_conv_illegal_output(c, filter));
237 		}
238 	}
239 
240 	return c;
241 }
242