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1 /* Copyright (c) 2008, 2009, 2013 Nicira, Inc.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
23 /* General-purpose circular queue of bytes. */
25 uint8_t *buffer
; /* Circular queue. */
26 unsigned int size
; /* Number of bytes allocated for 'buffer'. */
27 unsigned int head
; /* Head of queue. */
28 unsigned int tail
; /* Chases the head. */
31 void byteq_init(struct byteq
*, uint8_t *buffer
, size_t size
);
32 int byteq_used(const struct byteq
*);
33 int byteq_avail(const struct byteq
*);
34 bool byteq_is_empty(const struct byteq
*);
35 bool byteq_is_full(const struct byteq
*);
36 void byteq_put(struct byteq
*, uint8_t c
);
37 void byteq_putn(struct byteq
*, const void *, size_t n
);
38 void byteq_put_string(struct byteq
*, const char *);
39 uint8_t byteq_get(struct byteq
*);
40 int byteq_write(struct byteq
*, int fd
);
41 int byteq_read(struct byteq
*, int fd
);
43 uint8_t *byteq_head(struct byteq
*);
44 int byteq_headroom(const struct byteq
*);
45 void byteq_advance_head(struct byteq
*, unsigned int n
);
46 int byteq_tailroom(const struct byteq
*);
47 const uint8_t *byteq_tail(const struct byteq
*);
48 void byteq_advance_tail(struct byteq
*, unsigned int n
);