1*16d86563SAlexander Pyhalov /*
2*16d86563SAlexander Pyhalov * CDDL HEADER START
3*16d86563SAlexander Pyhalov *
4*16d86563SAlexander Pyhalov * The contents of this file are subject to the terms of the
5*16d86563SAlexander Pyhalov * Common Development and Distribution License (the "License").
6*16d86563SAlexander Pyhalov * You may not use this file except in compliance with the License.
7*16d86563SAlexander Pyhalov *
8*16d86563SAlexander Pyhalov * You can obtain a copy of the license at src/OPENSOLARIS.LICENSE
9*16d86563SAlexander Pyhalov * or http://www.opensolaris.org/os/licensing.
10*16d86563SAlexander Pyhalov * See the License for the specific language governing permissions
11*16d86563SAlexander Pyhalov * and limitations under the License.
12*16d86563SAlexander Pyhalov *
13*16d86563SAlexander Pyhalov * When distributing Covered Code, include this CDDL HEADER in each
14*16d86563SAlexander Pyhalov * file and include the License file at src/OPENSOLARIS.LICENSE.
15*16d86563SAlexander Pyhalov * If applicable, add the following below this CDDL HEADER, with the
16*16d86563SAlexander Pyhalov * fields enclosed by brackets "[]" replaced with your own identifying
17*16d86563SAlexander Pyhalov * information: Portions Copyright [yyyy] [name of copyright owner]
18*16d86563SAlexander Pyhalov *
19*16d86563SAlexander Pyhalov * CDDL HEADER END
20*16d86563SAlexander Pyhalov */
21*16d86563SAlexander Pyhalov /*
22*16d86563SAlexander Pyhalov * Copyright (c) 2008, by Sun Microsystems, Inc.
23*16d86563SAlexander Pyhalov * All rights reserved.
24*16d86563SAlexander Pyhalov */
25*16d86563SAlexander Pyhalov
26*16d86563SAlexander Pyhalov #include <stdio.h>
27*16d86563SAlexander Pyhalov #include <errno.h>
28*16d86563SAlexander Pyhalov #include <stdlib.h>
29*16d86563SAlexander Pyhalov #include <sys/types.h>
30*16d86563SAlexander Pyhalov #define __NEED_TCVN_2_VISCII__
31*16d86563SAlexander Pyhalov #include <viscii_tcvn.h> /* VISCII <-> TCVN mapping table */
32*16d86563SAlexander Pyhalov #include <vi_combine.h>
33*16d86563SAlexander Pyhalov #include "common_defs.h"
34*16d86563SAlexander Pyhalov
35*16d86563SAlexander Pyhalov
36*16d86563SAlexander Pyhalov #define NON_ID_CHAR '?' /* non-identified character */
37*16d86563SAlexander Pyhalov
38*16d86563SAlexander Pyhalov typedef struct _icv_state {
39*16d86563SAlexander Pyhalov int _errno; /* internal errno */
40*16d86563SAlexander Pyhalov unsigned short last;
41*16d86563SAlexander Pyhalov } _iconv_st;
42*16d86563SAlexander Pyhalov
43*16d86563SAlexander Pyhalov
44*16d86563SAlexander Pyhalov static int binsearch(unsigned short x, Combine_map_tcvn v[], int n);
45*16d86563SAlexander Pyhalov
46*16d86563SAlexander Pyhalov /*
47*16d86563SAlexander Pyhalov * Open; called from iconv_open()
48*16d86563SAlexander Pyhalov */
49*16d86563SAlexander Pyhalov void *
_icv_open()50*16d86563SAlexander Pyhalov _icv_open()
51*16d86563SAlexander Pyhalov {
52*16d86563SAlexander Pyhalov _iconv_st *st;
53*16d86563SAlexander Pyhalov
54*16d86563SAlexander Pyhalov if ((st = (_iconv_st *)malloc(sizeof(_iconv_st))) == NULL) {
55*16d86563SAlexander Pyhalov errno = ENOMEM;
56*16d86563SAlexander Pyhalov return ((void *) -1);
57*16d86563SAlexander Pyhalov }
58*16d86563SAlexander Pyhalov
59*16d86563SAlexander Pyhalov st->_errno = 0;
60*16d86563SAlexander Pyhalov st->last = 0;
61*16d86563SAlexander Pyhalov return ((void *) st);
62*16d86563SAlexander Pyhalov }
63*16d86563SAlexander Pyhalov
64*16d86563SAlexander Pyhalov
65*16d86563SAlexander Pyhalov /*
66*16d86563SAlexander Pyhalov * Close; called from iconv_close()
67*16d86563SAlexander Pyhalov */
68*16d86563SAlexander Pyhalov void
_icv_close(_iconv_st * st)69*16d86563SAlexander Pyhalov _icv_close(_iconv_st *st)
70*16d86563SAlexander Pyhalov {
71*16d86563SAlexander Pyhalov if (!st)
72*16d86563SAlexander Pyhalov errno = EBADF;
73*16d86563SAlexander Pyhalov else
74*16d86563SAlexander Pyhalov free(st);
75*16d86563SAlexander Pyhalov }
76*16d86563SAlexander Pyhalov
77*16d86563SAlexander Pyhalov
78*16d86563SAlexander Pyhalov /*
79*16d86563SAlexander Pyhalov * Actual conversion; called from iconv()
80*16d86563SAlexander Pyhalov */
81*16d86563SAlexander Pyhalov size_t
_icv_iconv(_iconv_st * st,char ** inbuf,size_t * inbytesleft,char ** outbuf,size_t * outbytesleft)82*16d86563SAlexander Pyhalov _icv_iconv(_iconv_st *st, char **inbuf, size_t *inbytesleft,
83*16d86563SAlexander Pyhalov char **outbuf, size_t *outbytesleft)
84*16d86563SAlexander Pyhalov {
85*16d86563SAlexander Pyhalov int unconv = 0;
86*16d86563SAlexander Pyhalov int idx = -1;
87*16d86563SAlexander Pyhalov unsigned char chout = 0;
88*16d86563SAlexander Pyhalov #ifdef DEBUG
89*16d86563SAlexander Pyhalov fprintf(stderr, "========== iconv(): TCVN5712 -->UCS-2 ==========\n");
90*16d86563SAlexander Pyhalov #endif
91*16d86563SAlexander Pyhalov if (st == NULL) {
92*16d86563SAlexander Pyhalov errno = EBADF;
93*16d86563SAlexander Pyhalov return ((size_t) -1);
94*16d86563SAlexander Pyhalov }
95*16d86563SAlexander Pyhalov
96*16d86563SAlexander Pyhalov if (inbuf == NULL || *inbuf == NULL) { /* Reset request. */
97*16d86563SAlexander Pyhalov st->_errno = 0;
98*16d86563SAlexander Pyhalov return ((size_t) 0);
99*16d86563SAlexander Pyhalov }
100*16d86563SAlexander Pyhalov
101*16d86563SAlexander Pyhalov st->_errno = 0; /* Reset internal errno */
102*16d86563SAlexander Pyhalov errno = 0; /* Reset external errno */
103*16d86563SAlexander Pyhalov
104*16d86563SAlexander Pyhalov /* Convert tcvn encoding to UCS-2 */
105*16d86563SAlexander Pyhalov while (*inbytesleft > 0 && *outbytesleft > 0) {
106*16d86563SAlexander Pyhalov unsigned char ch = 0;
107*16d86563SAlexander Pyhalov
108*16d86563SAlexander Pyhalov if (st->last != 0) {
109*16d86563SAlexander Pyhalov if (ISCOMB_TCVN((unsigned char)**inbuf)) {
110*16d86563SAlexander Pyhalov /*
111*16d86563SAlexander Pyhalov * Composed characters with combine character
112*16d86563SAlexander Pyhalov */
113*16d86563SAlexander Pyhalov idx = binsearch(st->last, tcvn_comb_data, VOWEL_NUM);
114*16d86563SAlexander Pyhalov if (idx >= 0) {
115*16d86563SAlexander Pyhalov ch = tcvn_comb_data[idx].composed[(unsigned char)**inbuf - 0xb0];
116*16d86563SAlexander Pyhalov } else {
117*16d86563SAlexander Pyhalov errno = EBADF;
118*16d86563SAlexander Pyhalov return ((size_t)-1);
119*16d86563SAlexander Pyhalov }
120*16d86563SAlexander Pyhalov st->last = 0;
121*16d86563SAlexander Pyhalov } else {
122*16d86563SAlexander Pyhalov tcvn_2_viscii(st->last, &chout);
123*16d86563SAlexander Pyhalov if (st->last != 0x0 && chout == 0x0) {
124*16d86563SAlexander Pyhalov unconv++;
125*16d86563SAlexander Pyhalov chout = NON_ID_CHAR;
126*16d86563SAlexander Pyhalov }
127*16d86563SAlexander Pyhalov
128*16d86563SAlexander Pyhalov *(*outbuf)++ = chout;
129*16d86563SAlexander Pyhalov (*outbytesleft) -= 1;
130*16d86563SAlexander Pyhalov ch = (unsigned char)**inbuf;
131*16d86563SAlexander Pyhalov }
132*16d86563SAlexander Pyhalov st->last = 0;
133*16d86563SAlexander Pyhalov } else {
134*16d86563SAlexander Pyhalov ch = (unsigned char)**inbuf;
135*16d86563SAlexander Pyhalov if (ch >= 0x41 && ch <= 0xad
136*16d86563SAlexander Pyhalov && ((tcvn_comp_bases_mask0[(ch-0x40) >> 5] >> (ch & 0x1f)) & 1)) {
137*16d86563SAlexander Pyhalov /*
138*16d86563SAlexander Pyhalov * uni is vowel, it's a possible match with combine character.
139*16d86563SAlexander Pyhalov * Buffer it.
140*16d86563SAlexander Pyhalov * */
141*16d86563SAlexander Pyhalov st->last = ch;
142*16d86563SAlexander Pyhalov (*inbuf)++;
143*16d86563SAlexander Pyhalov (*inbytesleft)--;
144*16d86563SAlexander Pyhalov continue;
145*16d86563SAlexander Pyhalov }
146*16d86563SAlexander Pyhalov }
147*16d86563SAlexander Pyhalov
148*16d86563SAlexander Pyhalov
149*16d86563SAlexander Pyhalov tcvn_2_viscii(ch, &chout);
150*16d86563SAlexander Pyhalov if (ch != 0x0 && chout == 0x0) {
151*16d86563SAlexander Pyhalov unconv++;
152*16d86563SAlexander Pyhalov chout = NON_ID_CHAR;
153*16d86563SAlexander Pyhalov }
154*16d86563SAlexander Pyhalov
155*16d86563SAlexander Pyhalov *(*outbuf)++ = chout;
156*16d86563SAlexander Pyhalov (*outbytesleft) -= 1;
157*16d86563SAlexander Pyhalov (*inbuf)++;
158*16d86563SAlexander Pyhalov (*inbytesleft)--;
159*16d86563SAlexander Pyhalov
160*16d86563SAlexander Pyhalov }
161*16d86563SAlexander Pyhalov
162*16d86563SAlexander Pyhalov if ( *inbytesleft > 0 && *outbytesleft <= 0 ) {
163*16d86563SAlexander Pyhalov errno = E2BIG;
164*16d86563SAlexander Pyhalov st->last = 0;
165*16d86563SAlexander Pyhalov return ((size_t)-1);
166*16d86563SAlexander Pyhalov }
167*16d86563SAlexander Pyhalov
168*16d86563SAlexander Pyhalov if (st->last != 0) {
169*16d86563SAlexander Pyhalov tcvn_2_viscii(st->last, &chout);
170*16d86563SAlexander Pyhalov if (**inbuf != 0x0 && chout == 0x0) {
171*16d86563SAlexander Pyhalov unconv++;
172*16d86563SAlexander Pyhalov chout = NON_ID_CHAR;
173*16d86563SAlexander Pyhalov }
174*16d86563SAlexander Pyhalov st->last = 0;
175*16d86563SAlexander Pyhalov *(*outbuf)++ = chout;
176*16d86563SAlexander Pyhalov (*outbytesleft) -= 1;
177*16d86563SAlexander Pyhalov }
178*16d86563SAlexander Pyhalov return ((size_t)unconv);
179*16d86563SAlexander Pyhalov
180*16d86563SAlexander Pyhalov }
181*16d86563SAlexander Pyhalov
182*16d86563SAlexander Pyhalov /* binsearch: find x in v[0] <= v[1] <= ... <= v[n-1] */
binsearch(unsigned short x,Combine_map_tcvn v[],int n)183*16d86563SAlexander Pyhalov static int binsearch(unsigned short x, Combine_map_tcvn v[], int n)
184*16d86563SAlexander Pyhalov {
185*16d86563SAlexander Pyhalov int low = 0;
186*16d86563SAlexander Pyhalov int mid = 0;
187*16d86563SAlexander Pyhalov int high = n - 1;
188*16d86563SAlexander Pyhalov
189*16d86563SAlexander Pyhalov low = 0;
190*16d86563SAlexander Pyhalov while (low <= high) {
191*16d86563SAlexander Pyhalov mid = (low + high) / 2;
192*16d86563SAlexander Pyhalov if (x < (unsigned short)v[mid].base)
193*16d86563SAlexander Pyhalov high = mid - 1;
194*16d86563SAlexander Pyhalov else if (x > (unsigned short)v[mid].base)
195*16d86563SAlexander Pyhalov low = mid + 1;
196*16d86563SAlexander Pyhalov else
197*16d86563SAlexander Pyhalov /* found match */
198*16d86563SAlexander Pyhalov return mid;
199*16d86563SAlexander Pyhalov }
200*16d86563SAlexander Pyhalov
201*16d86563SAlexander Pyhalov /* no match */
202*16d86563SAlexander Pyhalov return (-1);
203*16d86563SAlexander Pyhalov }
204