1: /*
2: * Copyright (C) 1999-2001, 2008 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: * ISO-2022-KR
23: */
24:
25: /* Specification: RFC 1557 */
26:
27: /* Note: CJK.INF says the SO designator needs to appear only once at the
28: beginning of a text, but to decrease the risk of ambiguities, when
29: producing ISO-2022-KR, we repeat the designator in every line containing
30: SO characters. RFC 1557 does not mandate this. */
31:
32: #define ESC 0x1b
33: #define SO 0x0e
34: #define SI 0x0f
35:
36: /*
37: * The state is composed of one of the following values
38: */
39: #define STATE_ASCII 0
40: #define STATE_TWOBYTE 1
41: /*
42: * and one of the following values, << 8
43: */
44: #define STATE2_NONE 0
45: #define STATE2_DESIGNATED_KSC5601 1
46:
47: #define SPLIT_STATE \
48: unsigned int state1 = state & 0xff, state2 = state >> 8
49: #define COMBINE_STATE \
50: state = (state2 << 8) | state1
51:
52: static int
53: iso2022_kr_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
54: {
55: state_t state = conv->istate;
56: SPLIT_STATE;
57: int count = 0;
58: unsigned char c;
59: for (;;) {
60: c = *s;
61: if (c == ESC) {
62: if (n < count+4)
63: goto none;
64: if (s[1] == '$') {
65: if (s[2] == ')') {
66: if (s[3] == 'C') {
67: state2 = STATE2_DESIGNATED_KSC5601;
68: s += 4; count += 4;
69: if (n < count+1)
70: goto none;
71: continue;
72: }
73: }
74: }
75: goto ilseq;
76: }
77: if (c == SO) {
78: if (state2 != STATE2_DESIGNATED_KSC5601)
79: goto ilseq;
80: state1 = STATE_TWOBYTE;
81: s++; count++;
82: if (n < count+1)
83: goto none;
84: continue;
85: }
86: if (c == SI) {
87: state1 = STATE_ASCII;
88: s++; count++;
89: if (n < count+1)
90: goto none;
91: continue;
92: }
93: break;
94: }
95: switch (state1) {
96: case STATE_ASCII:
97: if (c < 0x80) {
98: int ret = ascii_mbtowc(conv,pwc,s,1);
99: if (ret == RET_ILSEQ)
100: goto ilseq;
101: if (ret != 1) abort();
102: #if 0 /* Accept ISO-2022-KR according to CJK.INF. */
103: if (*pwc == 0x000a || *pwc == 0x000d)
104: state2 = STATE2_NONE;
105: #endif
106: COMBINE_STATE;
107: conv->istate = state;
108: return count+1;
109: } else
110: goto ilseq;
111: case STATE_TWOBYTE:
112: if (n < count+2)
113: goto none;
114: if (state2 != STATE2_DESIGNATED_KSC5601) abort();
115: if (s[0] < 0x80 && s[1] < 0x80) {
116: int ret = ksc5601_mbtowc(conv,pwc,s,2);
117: if (ret == RET_ILSEQ)
118: goto ilseq;
119: if (ret != 2) abort();
120: COMBINE_STATE;
121: conv->istate = state;
122: return count+2;
123: } else
124: goto ilseq;
125: default: abort();
126: }
127:
128: none:
129: COMBINE_STATE;
130: conv->istate = state;
131: return RET_TOOFEW(count);
132:
133: ilseq:
134: COMBINE_STATE;
135: conv->istate = state;
136: return RET_SHIFT_ILSEQ(count);
137: }
138:
139: static int
140: iso2022_kr_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
141: {
142: state_t state = conv->ostate;
143: SPLIT_STATE;
144: unsigned char buf[2];
145: int ret;
146:
147: /* Try ASCII. */
148: ret = ascii_wctomb(conv,buf,wc,1);
149: if (ret != RET_ILUNI) {
150: if (ret != 1) abort();
151: if (buf[0] < 0x80) {
152: int count = (state1 == STATE_ASCII ? 1 : 2);
153: if (n < count)
154: return RET_TOOSMALL;
155: if (state1 != STATE_ASCII) {
156: r[0] = SI;
157: r += 1;
158: state1 = STATE_ASCII;
159: }
160: r[0] = buf[0];
161: if (wc == 0x000a || wc == 0x000d)
162: state2 = STATE2_NONE;
163: COMBINE_STATE;
164: conv->ostate = state;
165: return count;
166: }
167: }
168:
169: /* Try KS C 5601-1992. */
170: ret = ksc5601_wctomb(conv,buf,wc,2);
171: if (ret != RET_ILUNI) {
172: if (ret != 2) abort();
173: if (buf[0] < 0x80 && buf[1] < 0x80) {
174: int count = (state2 == STATE2_DESIGNATED_KSC5601 ? 0 : 4) + (state1 == STATE_TWOBYTE ? 0 : 1) + 2;
175: if (n < count)
176: return RET_TOOSMALL;
177: if (state2 != STATE2_DESIGNATED_KSC5601) {
178: r[0] = ESC;
179: r[1] = '$';
180: r[2] = ')';
181: r[3] = 'C';
182: r += 4;
183: state2 = STATE2_DESIGNATED_KSC5601;
184: }
185: if (state1 != STATE_TWOBYTE) {
186: r[0] = SO;
187: r += 1;
188: state1 = STATE_TWOBYTE;
189: }
190: r[0] = buf[0];
191: r[1] = buf[1];
192: COMBINE_STATE;
193: conv->ostate = state;
194: return count;
195: }
196: }
197:
198: return RET_ILUNI;
199: }
200:
201: static int
202: iso2022_kr_reset (conv_t conv, unsigned char *r, int n)
203: {
204: state_t state = conv->ostate;
205: SPLIT_STATE;
206: (void)state2;
207: if (state1 != STATE_ASCII) {
208: if (n < 1)
209: return RET_TOOSMALL;
210: r[0] = SI;
211: /* conv->ostate = 0; will be done by the caller */
212: return 1;
213: } else
214: return 0;
215: }
216:
217: #undef COMBINE_STATE
218: #undef SPLIT_STATE
219: #undef STATE2_DESIGNATED_KSC5601
220: #undef STATE2_NONE
221: #undef STATE_TWOBYTE
222: #undef STATE_ASCII
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