-
Notifications
You must be signed in to change notification settings - Fork 72
/
fmq_chunk.c
197 lines (152 loc) · 5.16 KB
/
fmq_chunk.c
1
2
3
4
5
6
7
8
9
10
11
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
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
/* =========================================================================
fmq_chunk - work with memory chunks
-------------------------------------------------------------------------
Copyright (c) 1991-2012 iMatix Corporation -- http://www.imatix.com
Copyright other contributors as noted in the AUTHORS file.
This file is part of FILEMQ, see http://filemq.org.
This is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the
Free Software Foundation; either version 3 of the License, or (at your
option) any later version.
This software is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTA-
BILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see http://www.gnu.org/licenses/.
=========================================================================*/
#include <czmq.h>
#include "../include/fmq.h"
// Structure of our class
struct _fmq_chunk_t {
size_t size; // Current size of data part
size_t max_size; // Maximum allocated size
byte *data; // Data part follows here
};
// --------------------------------------------------------------------------
// Constructor
fmq_chunk_t *
fmq_chunk_new (const void *data, size_t size)
{
fmq_chunk_t *self = (fmq_chunk_t *) zmalloc (sizeof (fmq_chunk_t) + size);
if (self) {
self->max_size = size;
self->data = (byte *) self + sizeof (fmq_chunk_t);
if (data) {
self->size = size;
memcpy (self->data, data, size);
}
else
self->size = 0;
}
return self;
}
// --------------------------------------------------------------------------
// Destroy a chunk
void
fmq_chunk_destroy (fmq_chunk_t **self_p)
{
assert (self_p);
if (*self_p) {
fmq_chunk_t *self = *self_p;
// If data was reallocated independently, free it independently
if (self->data != (byte *) self + sizeof (fmq_chunk_t))
free (self->data);
free (self);
*self_p = NULL;
}
}
// --------------------------------------------------------------------------
// Resizes chunk max_size as requested; chunk_cur size is set to zero
void
fmq_chunk_resize (fmq_chunk_t *self, size_t size)
{
// If data was reallocated independently, free it independently
if (self->data != (byte *) self + sizeof (fmq_chunk_t))
free (self->data);
self->data = zmalloc (size);
self->max_size = size;
self->size = 0;
}
// --------------------------------------------------------------------------
// Set chunk data from user-supplied data; truncate if too large
// Returns actual size of chunk
size_t
fmq_chunk_set (fmq_chunk_t *self, const void *data, size_t size)
{
assert (self);
if (size > self->max_size)
size = self->max_size;
memcpy (self->data, data, size);
self->size = size;
return size;
}
// --------------------------------------------------------------------------
// Fill chunk data from user-supplied octet
// Returns actual size of chunk
size_t
fmq_chunk_fill (fmq_chunk_t *self, byte filler, size_t size)
{
assert (self);
if (size > self->max_size)
size = self->max_size;
memset (self->data, filler, size);
self->size = size;
return size;
}
// --------------------------------------------------------------------------
// Return chunk cur size
size_t
fmq_chunk_size (fmq_chunk_t *self)
{
assert (self);
return self->size;
}
// --------------------------------------------------------------------------
// Return chunk max size
size_t
fmq_chunk_max_size (fmq_chunk_t *self)
{
assert (self);
return self->max_size;
}
// --------------------------------------------------------------------------
// Return chunk data
byte *
fmq_chunk_data (fmq_chunk_t *self)
{
assert (self);
return self->data;
}
// --------------------------------------------------------------------------
// Read chunk from an open file descriptor
fmq_chunk_t *
fmq_chunk_read (FILE *handle, size_t bytes)
{
fmq_chunk_t *self = fmq_chunk_new (NULL, bytes);
self->size = fread (self->data, 1, bytes, handle);
return self;
}
// --------------------------------------------------------------------------
// Write chunk to an open file descriptor
int
fmq_chunk_write (fmq_chunk_t *self, FILE *handle)
{
size_t items = fwrite (self->data, 1, self->size, handle);
int rc = (items < self->size)? -1: 0;
return rc;
}
// --------------------------------------------------------------------------
// Self test of this class
int
fmq_chunk_test (bool verbose)
{
printf (" * fmq_chunk: ");
fmq_chunk_t *chunk = fmq_chunk_new ("1234567890", 10);
assert (chunk);
assert (fmq_chunk_size (chunk) == 10);
assert (memcmp (fmq_chunk_data (chunk), "1234567890", 10) == 0);
fmq_chunk_destroy (&chunk);
printf ("OK\n");
return 0;
}