Trung Nguyen / WiflyInterface

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Fork of WiflyInterface by mbed official

Wifly/CBuffer.h@1:fb4494783863, 2012-08-24 (annotated)

Committer:
samux
Date:
Fri Aug 24 13:48:36 2012 +0000
Revision:
1:fb4494783863
first commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
samux 1:fb4494783863 1 /* Copyright (C) 2012 mbed.org, MIT License
samux 1:fb4494783863 2 *
samux 1:fb4494783863 3 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
samux 1:fb4494783863 4 * and associated documentation files (the "Software"), to deal in the Software without restriction,
samux 1:fb4494783863 5 * including without limitation the rights to use, copy, modify, merge, publish, distribute,
samux 1:fb4494783863 6 * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
samux 1:fb4494783863 7 * furnished to do so, subject to the following conditions:
samux 1:fb4494783863 8 *
samux 1:fb4494783863 9 * The above copyright notice and this permission notice shall be included in all copies or
samux 1:fb4494783863 10 * substantial portions of the Software.
samux 1:fb4494783863 11 *
samux 1:fb4494783863 12 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
samux 1:fb4494783863 13 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
samux 1:fb4494783863 14 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
samux 1:fb4494783863 15 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
samux 1:fb4494783863 16 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
samux 1:fb4494783863 17 */
samux 1:fb4494783863 18
samux 1:fb4494783863 19 #ifndef CIRCBUFFER_H_
samux 1:fb4494783863 20 #define CIRCBUFFER_H_
samux 1:fb4494783863 21
samux 1:fb4494783863 22 template <class T>
samux 1:fb4494783863 23 class CircBuffer {
samux 1:fb4494783863 24 public:
samux 1:fb4494783863 25 CircBuffer(int length) {
samux 1:fb4494783863 26 write = 0;
samux 1:fb4494783863 27 read = 0;
samux 1:fb4494783863 28 size = length + 1;
samux 1:fb4494783863 29 buf = (T *)malloc(size * sizeof(T));
samux 1:fb4494783863 30 };
samux 1:fb4494783863 31
samux 1:fb4494783863 32 bool isFull() {
samux 1:fb4494783863 33 return (((write + 1) % size) == read);
samux 1:fb4494783863 34 };
samux 1:fb4494783863 35
samux 1:fb4494783863 36 bool isEmpty() {
samux 1:fb4494783863 37 return (read == write);
samux 1:fb4494783863 38 };
samux 1:fb4494783863 39
samux 1:fb4494783863 40 void queue(T k) {
samux 1:fb4494783863 41 if (isFull()) {
samux 1:fb4494783863 42 read++;
samux 1:fb4494783863 43 read %= size;
samux 1:fb4494783863 44 }
samux 1:fb4494783863 45 buf[write++] = k;
samux 1:fb4494783863 46 write %= size;
samux 1:fb4494783863 47 }
samux 1:fb4494783863 48
samux 1:fb4494783863 49 void flush() {
samux 1:fb4494783863 50 read = 0;
samux 1:fb4494783863 51 write = 0;
samux 1:fb4494783863 52 }
samux 1:fb4494783863 53
samux 1:fb4494783863 54
samux 1:fb4494783863 55 uint32_t available() {
samux 1:fb4494783863 56 return (write >= read) ? write - read : size - read + write;
samux 1:fb4494783863 57 };
samux 1:fb4494783863 58
samux 1:fb4494783863 59 bool dequeue(T * c) {
samux 1:fb4494783863 60 bool empty = isEmpty();
samux 1:fb4494783863 61 if (!empty) {
samux 1:fb4494783863 62 *c = buf[read++];
samux 1:fb4494783863 63 read %= size;
samux 1:fb4494783863 64 }
samux 1:fb4494783863 65 return(!empty);
samux 1:fb4494783863 66 };
samux 1:fb4494783863 67
samux 1:fb4494783863 68 private:
samux 1:fb4494783863 69 volatile uint32_t write;
samux 1:fb4494783863 70 volatile uint32_t read;
samux 1:fb4494783863 71 uint32_t size;
samux 1:fb4494783863 72 T * buf;
samux 1:fb4494783863 73 };
samux 1:fb4494783863 74
samux 1:fb4494783863 75 #endif