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1.1 misho 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_utf7imap.h"
36:
37: const mbfl_encoding mbfl_encoding_utf7imap = {
38: mbfl_no_encoding_utf7imap,
39: "UTF7-IMAP",
40: NULL,
41: NULL,
42: NULL,
43: MBFL_ENCTYPE_MBCS | MBFL_ENCTYPE_SHFTCODE
44: };
45:
46: const struct mbfl_convert_vtbl vtbl_utf7imap_wchar = {
47: mbfl_no_encoding_utf7imap,
48: mbfl_no_encoding_wchar,
49: mbfl_filt_conv_common_ctor,
50: mbfl_filt_conv_common_dtor,
51: mbfl_filt_conv_utf7imap_wchar,
52: mbfl_filt_conv_common_flush };
53:
54: const struct mbfl_convert_vtbl vtbl_wchar_utf7imap = {
55: mbfl_no_encoding_wchar,
56: mbfl_no_encoding_utf7imap,
57: mbfl_filt_conv_common_ctor,
58: mbfl_filt_conv_common_dtor,
59: mbfl_filt_conv_wchar_utf7imap,
60: mbfl_filt_conv_wchar_utf7imap_flush };
61:
62: #define CK(statement) do { if ((statement) < 0) return (-1); } while (0)
63:
64: /*
65: * UTF7-IMAP => wchar
66: */
67: int mbfl_filt_conv_utf7imap_wchar(int c, mbfl_convert_filter *filter)
68: {
69: int s, n;
70:
71: n = -1;
72: if (filter->status != 0) { /* Modified Base64 */
73: if (c >= 0x41 && c <= 0x5a) { /* A - Z */
74: n = c - 65;
75: } else if (c >= 0x61 && c <= 0x7a) { /* a - z */
76: n = c - 71;
77: } else if (c >= 0x30 && c <= 0x39) { /* 0 - 9 */
78: n = c + 4;
79: } else if (c == 0x2b) { /* '+' */
80: n = 62;
81: } else if (c == 0x2c) { /* ',' */
82: n = 63;
83: }
84: if (n < 0 || n > 63) {
85: if (c == 0x2d) {
86: if (filter->status == 1) { /* "&-" -> "&" */
87: CK((*filter->output_function)(0x26, filter->data));
88: }
89: } else if (c >= 0 && c < 0x80) { /* ASCII exclude '-' */
90: CK((*filter->output_function)(c, filter->data));
91: } else { /* illegal character */
92: s = c & MBFL_WCSGROUP_MASK;
93: s |= MBFL_WCSGROUP_THROUGH;
94: CK((*filter->output_function)(s, filter->data));
95: }
96: filter->cache = 0;
97: filter->status = 0;
98: return c;
99: }
100: }
101:
102: switch (filter->status) {
103: /* directly encoded characters */
104: case 0:
105: if (c == 0x26) { /* '&' shift character */
106: filter->status++;
107: } else if (c >= 0 && c < 0x80) { /* ASCII */
108: CK((*filter->output_function)(c, filter->data));
109: } else { /* illegal character */
110: s = c & MBFL_WCSGROUP_MASK;
111: s |= MBFL_WCSGROUP_THROUGH;
112: CK((*filter->output_function)(s, filter->data));
113: }
114: break;
115:
116: /* decode Modified Base64 */
117: case 1:
118: case 2:
119: filter->cache |= n << 10;
120: filter->status = 3;
121: break;
122: case 3:
123: filter->cache |= n << 4;
124: filter->status = 4;
125: break;
126: case 4:
127: s = ((n >> 2) & 0xf) | (filter->cache & 0xffff);
128: n = (n & 0x3) << 14;
129: filter->status = 5;
130: if (s >= 0xd800 && s < 0xdc00) {
131: s = (((s & 0x3ff) << 16) + 0x400000) | n;
132: filter->cache = s;
133: } else if (s >= 0xdc00 && s < 0xe000) {
134: s &= 0x3ff;
135: s |= (filter->cache & 0xfff0000) >> 6;
136: filter->cache = n;
137: if (s >= MBFL_WCSPLANE_SUPMIN && s < MBFL_WCSPLANE_SUPMAX) {
138: CK((*filter->output_function)(s, filter->data));
139: } else { /* illegal character */
140: s &= MBFL_WCSGROUP_MASK;
141: s |= MBFL_WCSGROUP_THROUGH;
142: CK((*filter->output_function)(s, filter->data));
143: }
144: } else {
145: filter->cache = n;
146: CK((*filter->output_function)(s, filter->data));
147: }
148: break;
149:
150: case 5:
151: filter->cache |= n << 8;
152: filter->status = 6;
153: break;
154: case 6:
155: filter->cache |= n << 2;
156: filter->status = 7;
157: break;
158: case 7:
159: s = ((n >> 4) & 0x3) | (filter->cache & 0xffff);
160: n = (n & 0xf) << 12;
161: filter->status = 8;
162: if (s >= 0xd800 && s < 0xdc00) {
163: s = (((s & 0x3ff) << 16) + 0x400000) | n;
164: filter->cache = s;
165: } else if (s >= 0xdc00 && s < 0xe000) {
166: s &= 0x3ff;
167: s |= (filter->cache & 0xfff0000) >> 6;
168: filter->cache = n;
169: if (s >= MBFL_WCSPLANE_SUPMIN && s < MBFL_WCSPLANE_SUPMAX) {
170: CK((*filter->output_function)(s, filter->data));
171: } else { /* illegal character */
172: s &= MBFL_WCSGROUP_MASK;
173: s |= MBFL_WCSGROUP_THROUGH;
174: CK((*filter->output_function)(s, filter->data));
175: }
176: } else {
177: filter->cache = n;
178: CK((*filter->output_function)(s, filter->data));
179: }
180: break;
181:
182: case 8:
183: filter->cache |= n << 6;
184: filter->status = 9;
185: break;
186: case 9:
187: s = n | (filter->cache & 0xffff);
188: filter->status = 2;
189: if (s >= 0xd800 && s < 0xdc00) {
190: s = (((s & 0x3ff) << 16) + 0x400000);
191: filter->cache = s;
192: } else if (s >= 0xdc00 && s < 0xe000) {
193: s &= 0x3ff;
194: s |= (filter->cache & 0xfff0000) >> 6;
195: filter->cache = 0;
196: if (s >= MBFL_WCSPLANE_SUPMIN && s < MBFL_WCSPLANE_SUPMAX) {
197: CK((*filter->output_function)(s, filter->data));
198: } else { /* illegal character */
199: s &= MBFL_WCSGROUP_MASK;
200: s |= MBFL_WCSGROUP_THROUGH;
201: CK((*filter->output_function)(s, filter->data));
202: }
203: } else {
204: filter->cache = 0;
205: CK((*filter->output_function)(s, filter->data));
206: }
207: break;
208:
209: default:
210: filter->status = 0;
211: break;
212: }
213:
214: return c;
215: }
216:
217: static const unsigned char mbfl_utf7imap_base64_table[] =
218: {
219: /* 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', */
220: 0x41,0x42,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4a,0x4b,0x4c,0x4d,
221: /* 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', */
222: 0x4e,0x4f,0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57,0x58,0x59,0x5a,
223: /* 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', */
224: 0x61,0x62,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6a,0x6b,0x6c,0x6d,
225: /* 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', */
226: 0x6e,0x6f,0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7a,
227: /* '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', ',', '\0' */
228: 0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x2b,0x2c,0x00
229: };
230:
231: /*
232: * wchar => UTF7-IMAP
233: */
234: int mbfl_filt_conv_wchar_utf7imap(int c, mbfl_convert_filter *filter)
235: {
236: int n, s;
237:
238: n = 0;
239: if (c == 0x26) {
240: n = 1;
241: } else if ((c >= 0x20 && c <= 0x7e) || c == 0) {
242: n = 2;
243: } else if (c >= 0 && c < MBFL_WCSPLANE_UCS2MAX) {
244: ;
245: } else if (c >= MBFL_WCSPLANE_SUPMIN && c < MBFL_WCSPLANE_SUPMAX) {
246: s = ((c >> 10) - 0x40) | 0xd800;
247: CK((*filter->filter_function)(s, filter));
248: s = (c & 0x3ff) | 0xdc00;
249: CK((*filter->filter_function)(s, filter));
250: return c;
251: } else {
252: if (filter->illegal_mode != MBFL_OUTPUTFILTER_ILLEGAL_MODE_NONE) {
253: CK(mbfl_filt_conv_illegal_output(c, filter));
254: }
255: return c;
256: }
257:
258: switch (filter->status) {
259: case 0:
260: if (n != 0) { /* directly encode characters */
261: CK((*filter->output_function)(c, filter->data));
262: if (n == 1) {
263: CK((*filter->output_function)(0x2d, filter->data)); /* '-' */
264: }
265: } else { /* Modified Base64 */
266: CK((*filter->output_function)(0x26, filter->data)); /* '&' */
267: filter->status = 1;
268: filter->cache = c;
269: }
270: break;
271:
272: /* encode Modified Base64 */
273: case 1:
274: s = filter->cache;
275: CK((*filter->output_function)(mbfl_utf7imap_base64_table[(s >> 10) & 0x3f], filter->data));
276: CK((*filter->output_function)(mbfl_utf7imap_base64_table[(s >> 4) & 0x3f], filter->data));
277: if (n != 0) {
278: CK((*filter->output_function)(mbfl_utf7imap_base64_table[(s << 2) & 0x3c], filter->data));
279: CK((*filter->output_function)(0x2d, filter->data)); /* '-' */
280: CK((*filter->output_function)(c, filter->data));
281: if (n == 1) {
282: CK((*filter->output_function)(0x2d, filter->data)); /* '-' */
283: }
284: filter->status = 0;
285: } else {
286: filter->status = 2;
287: filter->cache = ((s & 0xf) << 16) | c;
288: }
289: break;
290:
291: case 2:
292: s = filter->cache;
293: CK((*filter->output_function)(mbfl_utf7imap_base64_table[(s >> 14) & 0x3f], filter->data));
294: CK((*filter->output_function)(mbfl_utf7imap_base64_table[(s >> 8) & 0x3f], filter->data));
295: CK((*filter->output_function)(mbfl_utf7imap_base64_table[(s >> 2) & 0x3f], filter->data));
296: if (n != 0) {
297: CK((*filter->output_function)(mbfl_utf7imap_base64_table[(s << 4) & 0x30], filter->data));
298: CK((*filter->output_function)(0x2d, filter->data)); /* '-' */
299: CK((*filter->output_function)(c, filter->data));
300: if (n == 1) {
301: CK((*filter->output_function)(0x2d, filter->data)); /* '-' */
302: }
303: filter->status = 0;
304: } else {
305: filter->status = 3;
306: filter->cache = ((s & 0x3) << 16) | c;
307: }
308: break;
309:
310: case 3:
311: s = filter->cache;
312: CK((*filter->output_function)(mbfl_utf7imap_base64_table[(s >> 12) & 0x3f], filter->data));
313: CK((*filter->output_function)(mbfl_utf7imap_base64_table[(s >> 6) & 0x3f], filter->data));
314: CK((*filter->output_function)(mbfl_utf7imap_base64_table[s & 0x3f], filter->data));
315: if (n != 0) {
316: CK((*filter->output_function)(0x2d, filter->data)); /* '-' */
317: CK((*filter->output_function)(c, filter->data));
318: if (n == 1) {
319: CK((*filter->output_function)(0x2d, filter->data)); /* '-' */
320: }
321: filter->status = 0;
322: } else {
323: filter->status = 1;
324: filter->cache = c;
325: }
326: break;
327:
328: default:
329: filter->status = 0;
330: break;
331: }
332:
333: return c;
334:
335: }
336:
337: int mbfl_filt_conv_wchar_utf7imap_flush(mbfl_convert_filter *filter)
338: {
339: int status, cache;
340:
341: status = filter->status;
342: cache = filter->cache;
343: filter->status = 0;
344: filter->cache = 0;
345: /* flush fragments */
346: switch (status) {
347: case 1:
348: CK((*filter->output_function)(mbfl_utf7imap_base64_table[(cache >> 10) & 0x3f], filter->data));
349: CK((*filter->output_function)(mbfl_utf7imap_base64_table[(cache >> 4) & 0x3f], filter->data));
350: CK((*filter->output_function)(mbfl_utf7imap_base64_table[(cache << 2) & 0x3c], filter->data));
351: CK((*filter->output_function)(0x2d, filter->data)); /* '-' */
352: break;
353:
354: case 2:
355: CK((*filter->output_function)(mbfl_utf7imap_base64_table[(cache >> 14) & 0x3f], filter->data));
356: CK((*filter->output_function)(mbfl_utf7imap_base64_table[(cache >> 8) & 0x3f], filter->data));
357: CK((*filter->output_function)(mbfl_utf7imap_base64_table[(cache >> 2) & 0x3f], filter->data));
358: CK((*filter->output_function)(mbfl_utf7imap_base64_table[(cache << 4) & 0x30], filter->data));
359: CK((*filter->output_function)(0x2d, filter->data)); /* '-' */
360: break;
361:
362: case 3:
363: CK((*filter->output_function)(mbfl_utf7imap_base64_table[(cache >> 12) & 0x3f], filter->data));
364: CK((*filter->output_function)(mbfl_utf7imap_base64_table[(cache >> 6) & 0x3f], filter->data));
365: CK((*filter->output_function)(mbfl_utf7imap_base64_table[cache & 0x3f], filter->data));
366: CK((*filter->output_function)(0x2d, filter->data)); /* '-' */
367: break;
368: }
369: return 0;
370: }
371:
372: