labcomm_private.h 5.99 KB
Newer Older
Anders Nilsson's avatar
Anders Nilsson committed
1
2
3
#ifndef _LABCOMM_PRIVATE_H_
#define _LABCOMM_PRIVATE_H_

4
5
#ifdef LABCOMM_COMPAT
  #include LABCOMM_COMPAT
Oscar Olsson's avatar
Oscar Olsson committed
6
7
8
9
10
#else
  #include <endian.h>
  #include <stdio.h>
#endif

11
#include <stdint.h>
Anders Nilsson's avatar
Anders Nilsson committed
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
#include <stdlib.h>
#include <string.h>
#include "labcomm.h"

/*
 * Predeclared aggregate type indices
 */
#define LABCOMM_TYPEDEF  0x01
#define LABCOMM_SAMPLE   0x02
#define LABCOMM_ARRAY    0x10
#define LABCOMM_STRUCT   0x11

/*
 * Predeclared primitive type indices
 */
#define LABCOMM_BOOLEAN  0x20 
#define LABCOMM_BYTE     0x21
#define LABCOMM_SHORT    0x22
#define LABCOMM_INT      0x23
#define LABCOMM_LONG     0x24
#define LABCOMM_FLOAT    0x25
#define LABCOMM_DOUBLE   0x26
#define LABCOMM_STRING   0x27

/*
 * Start index for user defined types
 */
39
#define LABCOMM_USER     0x40
Anders Nilsson's avatar
Anders Nilsson committed
40

41
42
43
44
/*
 *
 */
#define LABCOMM_DECLARE_SIGNATURE(name) \
45
  struct labcomm_signature name __attribute__((section("labcomm")))
46

Anders Nilsson's avatar
Anders Nilsson committed
47
48
49
/*
 * Semi private decoder declarations
 */
50
typedef void (*labcomm_handler_function)(void *value, void *context);
Anders Nilsson's avatar
Anders Nilsson committed
51

52
typedef void (*labcomm_decoder_function)(
53
  struct labcomm_reader *r,
54
55
  labcomm_handler_function handler,
  void *context);
Anders Nilsson's avatar
Anders Nilsson committed
56
57
58
59
60
61

/*
 * Non typesafe registration function to be called from
 * generated labcomm_decoder_register_* functions.
 */
void labcomm_internal_decoder_register(
62
63
64
65
  struct labcomm_decoder *d, 
  struct labcomm_signature *s, 
  labcomm_decoder_function decoder,
  labcomm_handler_function handler,
Anders Nilsson's avatar
Anders Nilsson committed
66
67
  void *context);

68
69
int labcomm_internal_decoder_ioctl(struct labcomm_decoder *decoder, 
				   int ioctl_action,
70
				   struct labcomm_signature *signature,
71
72
				   va_list args);

Anders Nilsson's avatar
Anders Nilsson committed
73
74
75
#if __BYTE_ORDER == __LITTLE_ENDIAN

#define LABCOMM_DECODE(name, type)					\
76
  static inline type labcomm_read_##name(struct labcomm_reader *r) {	\
Anders Nilsson's avatar
Anders Nilsson committed
77
78
79
    type result; int i;							\
    for (i = sizeof(type) - 1 ; i >= 0 ; i--) {				\
      if (r->pos >= r->count) {						\
80
	r->action.fill(r);						\
Anders Nilsson's avatar
Anders Nilsson committed
81
82
83
84
85
86
87
88
89
90
      }									\
      ((unsigned char*)(&result))[i] = r->data[r->pos];			\
      r->pos++;								\
    }									\
    return result;							\
  }

#else

#define LABCOMM_DECODE(name, type)					\
91
  static inline type labcomm_read_##name(struct labcomm_reader *r) {	\
Anders Nilsson's avatar
Anders Nilsson committed
92
93
94
    type result; int i;							\
    for (i = 0 ; i < sizeof(type) ; i++) {				\
      if (r->pos >= r->count) {						\
95
	r->action.fill(r);						\
Anders Nilsson's avatar
Anders Nilsson committed
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
      }									\
      ((unsigned char*)(&result))[i] = r->data[r->pos];			\
      r->pos++;								\
    }									\
    return result;							\
  }

#endif

LABCOMM_DECODE(boolean, unsigned char)
LABCOMM_DECODE(byte, unsigned char)
LABCOMM_DECODE(short, short)
LABCOMM_DECODE(int, int)
LABCOMM_DECODE(long, long long)
LABCOMM_DECODE(float, float)
LABCOMM_DECODE(double, double)
112

113
static inline unsigned int labcomm_read_packed32(struct labcomm_reader *r)
114
115
116
117
118
119
120
{
  unsigned int result = 0;
  
  while (1) {
    unsigned char tmp;

    if (r->pos >= r->count) {	
121
      r->action.fill(r);
122
123
124
125
126
127
128
129
130
131
132
    }
    tmp = r->data[r->pos];
    r->pos++;
    result = (result << 7) | (tmp & 0x7f);
    if ((tmp & 0x80) == 0) { 
      break; 
    }
  }
  return result;
}
 
133
static inline char *labcomm_read_string(struct labcomm_reader *r)
Anders Nilsson's avatar
Anders Nilsson committed
134
135
136
137
{
  char *result;
  int length, i; 
  
138
  length = labcomm_read_packed32(r);
Anders Nilsson's avatar
Anders Nilsson committed
139
140
141
  result = malloc(length + 1);
  for (i = 0 ; i < length ; i++) {
    if (r->pos >= r->count) {	
142
      r->action.fill(r);
Anders Nilsson's avatar
Anders Nilsson committed
143
144
145
146
147
148
149
150
151
152
153
    }
    result[i] = r->data[r->pos];
    r->pos++;
  }
  result[length] = 0;
  return result;
}

/*
 * Semi private encoder declarations
 */
154
typedef int (*labcomm_encoder_function)(
155
  struct labcomm_writer *,
Anders Nilsson's avatar
Anders Nilsson committed
156
157
158
  void *value);

void labcomm_internal_encoder_register(
159
160
  struct labcomm_encoder *encoder, 
  struct labcomm_signature *signature, 
161
  labcomm_encoder_function encode);
Anders Nilsson's avatar
Anders Nilsson committed
162

163
int labcomm_internal_encode(
164
165
  struct labcomm_encoder *encoder, 
  struct labcomm_signature *signature, 
166
  labcomm_encoder_function encode,
Anders Nilsson's avatar
Anders Nilsson committed
167
168
  void *value);

169
170
int labcomm_internal_encoder_ioctl(struct labcomm_encoder *encoder, 
				   int ioctl_action,
171
				   struct labcomm_signature *signature,
172
173
				   va_list args);

Anders Nilsson's avatar
Anders Nilsson committed
174
175
176
#if __BYTE_ORDER == __LITTLE_ENDIAN

#define LABCOMM_ENCODE(name, type)					\
177
  static inline int labcomm_write_##name(struct labcomm_writer *w, type data) { \
Anders Nilsson's avatar
Anders Nilsson committed
178
179
    int i;								\
    for (i = sizeof(type) - 1 ; i >= 0 ; i--) {				\
Oscar Olsson's avatar
Oscar Olsson committed
180
      if (w->pos >= w->count) { /*buffer is full*/			\
181
        int err;							\
182
	err = w->action.flush(w);					\
183
	if (err != 0) { return err; }					\
Anders Nilsson's avatar
Anders Nilsson committed
184
185
186
187
      }									\
      w->data[w->pos] = ((unsigned char*)(&data))[i];			\
      w->pos++;								\
    }									\
188
    return 0;								\
Anders Nilsson's avatar
Anders Nilsson committed
189
190
191
192
193
  }

#else

#define LABCOMM_ENCODE(name, type)					\
194
  static inline int labcomm_write_##name(struct labcomm_writer *w, type data) { \
Anders Nilsson's avatar
Anders Nilsson committed
195
196
197
    int i;								\
    for (i = 0 ; i < sizeof(type) ; i++) {				\
      if (w->pos >= w->count) {						\
198
        int err;							\
199
	err = w->action.flush(w);					\
200
	if (err != 0) { return err; }					\
Anders Nilsson's avatar
Anders Nilsson committed
201
202
203
204
      }									\
      w->data[w->pos] = ((unsigned char*)(&data))[i];			\
      w->pos++;								\
    }									\
205
    return 0;								\
Anders Nilsson's avatar
Anders Nilsson committed
206
207
208
209
210
211
212
213
214
215
216
  }

#endif

LABCOMM_ENCODE(boolean, unsigned char)
LABCOMM_ENCODE(byte, unsigned char)
LABCOMM_ENCODE(short, short)
LABCOMM_ENCODE(int, int)
LABCOMM_ENCODE(long, long long)
LABCOMM_ENCODE(float, float)
LABCOMM_ENCODE(double, double)
217

218
static inline int labcomm_write_packed32(struct labcomm_writer *w, 
219
220
221
222
223
224
225
226
227
228
229
					 unsigned int data)
{
  unsigned char tmp[5];
  int i;
  
  for (i = 0 ; i == 0 || data ; i++, data = (data >> 7)) {
    tmp[i] = data & 0x7f;
  }
  for (i = i - 1 ; i >= 0 ; i--) {
    if (w->pos >= w->count) {					
      int err;
230
      err = w->action.flush(w);
231
232
233
234
235
236
237
      if (err != 0) { return err; }
    }
    w->data[w->pos++] = tmp[i] | (i?0x80:0x00);
  }
  return 0;
}

238
static inline int labcomm_write_string(struct labcomm_writer *w, char *s)
Anders Nilsson's avatar
Anders Nilsson committed
239
{
240
  int length, i, err; 
Anders Nilsson's avatar
Anders Nilsson committed
241
242

  length = strlen((char*)s);
243
244
  err = labcomm_write_packed32(w, length);
  if (err != 0) { return err; }
Anders Nilsson's avatar
Anders Nilsson committed
245
246
  for (i = 0 ; i < length ; i++) {
    if (w->pos >= w->count) {	
247
      int err;
248
      err = w->action.flush(w);
249
      if (err != 0) { return err; }
Anders Nilsson's avatar
Anders Nilsson committed
250
251
252
253
    }
    w->data[w->pos] = s[i];
    w->pos++;
  }
254
  return 0;
Anders Nilsson's avatar
Anders Nilsson committed
255
256
257
}

#endif