1 /* This file is part of the YAZ toolkit.
2 * Copyright (C) Index Data
3 * See the file LICENSE for details.
4 */
5
6 /**
7 * \file odr_choice.c
8 * \brief Implements ODR CHOICE codec
9 */
10
11 #if HAVE_CONFIG_H
12 #include <config.h>
13 #endif
14
15 #include "odr-priv.h"
16
odr_choice(ODR o,Odr_arm arm[],void * p,void * whichp,const char * name)17 int odr_choice(ODR o, Odr_arm arm[], void *p, void *whichp,
18 const char *name)
19 {
20 int i, cl = -1, tg, cn, *which = (int *)whichp, bias = o->op->choice_bias;
21
22 if (o->error)
23 return 0;
24 if (o->direction != ODR_DECODE && !*(char**)p)
25 return 0;
26
27 if (o->direction == ODR_DECODE)
28 {
29 *which = -1;
30 *(char**)p = 0;
31 }
32 o->op->choice_bias = -1;
33
34 if (o->direction == ODR_PRINT)
35 {
36 if (name)
37 {
38 odr_prname(o, name);
39 odr_printf(o, "choice\n");
40 }
41 }
42 for (i = 0; arm[i].fun; i++)
43 {
44 if (o->direction == ODR_DECODE)
45 {
46 if (bias >= 0 && bias != arm[i].which)
47 continue;
48 *which = arm[i].which;
49 }
50 else if (*which != arm[i].which)
51 continue;
52
53 if (arm[i].tagmode != ODR_NONE)
54 {
55 if (o->direction == ODR_DECODE && cl < 0)
56 {
57 if (o->op->stack_top && !odr_constructed_more(o))
58 return 0;
59 if (ber_dectag(o->op->bp, &cl, &tg, &cn, odr_max(o)) <= 0)
60 return 0;
61 }
62 else if (o->direction != ODR_DECODE)
63 {
64 cl = arm[i].zclass;
65 tg = arm[i].tag;
66 }
67 if (tg == arm[i].tag && cl == arm[i].zclass)
68 {
69 if (arm[i].tagmode == ODR_IMPLICIT)
70 {
71 odr_implicit_settag(o, cl, tg);
72 return (*arm[i].fun)(o, (char **)p, 0, arm[i].name);
73 }
74 /* explicit */
75 if (!odr_constructed_begin(o, p, cl, tg, 0))
76 return 0;
77 return (*arm[i].fun)(o, (char **)p, 0, arm[i].name) &&
78 odr_constructed_end(o);
79 }
80 }
81 else /* no tagging. Have to poll type */
82 {
83 if ((*arm[i].fun)(o, (char **)p, 1, arm[i].name) && *(char**)p)
84 return 1;
85 }
86 }
87 return 0;
88 }
89
odr_choice_bias(ODR o,int what)90 void odr_choice_bias(ODR o, int what)
91 {
92 if (o->op->enable_bias)
93 o->op->choice_bias = what;
94 }
95
odr_choice_enable_bias(ODR o,int mode)96 void odr_choice_enable_bias (ODR o, int mode)
97 {
98 o->op->enable_bias = mode;
99 }
100 /*
101 * Local variables:
102 * c-basic-offset: 4
103 * c-file-style: "Stroustrup"
104 * indent-tabs-mode: nil
105 * End:
106 * vim: shiftwidth=4 tabstop=8 expandtab
107 */
108
109