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#include "ringbuf.h"
#include <pthread.h>
#include <string.h>
void RingBuffer_init(RingBuffer *self, size_t size) {
self->buffer = (uint8_t *)malloc(size);
if (!self->buffer) {
return;
}
self->max = size;
self->head = 0;
self->tail = 0;
self->full_flag = false;
self->finished_flag = false;
pthread_mutex_init(&self->mutex, NULL);
pthread_cond_init(&self->not_empty_cond, NULL);
pthread_cond_init(&self->not_full_cond, NULL);
}
void RingBuffer_destroy(RingBuffer *self) {
free(self->buffer);
pthread_mutex_destroy(&self->mutex);
pthread_cond_destroy(&self->not_empty_cond);
pthread_cond_destroy(&self->not_full_cond);
}
size_t RingBuffer_size(RingBuffer *self) {
size_t size;
if (self->full_flag) {
size = self->max;
} else if (self->head >= self->tail) {
size = self->head - self->tail;
} else {
size = self->max + self->head - self->tail;
}
return size;
}
size_t RingBuffer_space(RingBuffer *self) {
return self->max - RingBuffer_size(self);
}
void RingBuffer_end(RingBuffer *self) {
pthread_mutex_lock(&self->mutex);
self->finished_flag = true;
pthread_mutex_unlock(&self->mutex);
pthread_cond_signal(&self->not_empty_cond);
}
size_t RingBuffer_write(RingBuffer *self, const uint8_t *data, size_t len) {
size_t written = 0;
pthread_mutex_lock(&self->mutex);
while (written < len) {
while (self->full_flag) {
pthread_cond_wait(&self->not_full_cond, &self->mutex);
}
size_t free_space = RingBuffer_space(self);
size_t to_write = (len - written > free_space) ? free_space : len - written;
size_t first = (to_write > self->max - self->head) ? self->max - self->head : to_write;
memcpy(self->buffer + self->head, data + written, first);
size_t second = to_write - first;
if (second > 0) memcpy(self->buffer, data + written + first, second);
self->head = (self->head + to_write) % self->max;
if (to_write == free_space) self->full_flag = true;
written += to_write;
pthread_cond_signal(&self->not_empty_cond);
}
pthread_mutex_unlock(&self->mutex);
return written;
}
size_t RingBuffer_read(RingBuffer *self, uint8_t *data, size_t len) {
size_t read = 0;
pthread_mutex_lock(&self->mutex);
while (read < len) {
while (RingBuffer_size(self) == 0) {
if (self->finished_flag) {
goto end;
}
pthread_cond_wait(&self->not_empty_cond, &self->mutex);
}
size_t available = RingBuffer_size(self);
size_t to_read = (len - read > available) ? available : len - read;
size_t first = (to_read > self->max - self->tail) ? self->max - self->tail : to_read;
memcpy(data + read, self->buffer + self->tail, first);
size_t second = to_read - first;
if (second > 0) memcpy(data + read + first, self->buffer, second);
self->tail = (self->tail + to_read) % self->max;
self->full_flag = false;
read += to_read;
pthread_cond_signal(&self->not_full_cond);
}
end:
pthread_mutex_unlock(&self->mutex);
return read;
}
bool RingBuffer_write_word16le(RingBuffer* self, uint16_t x) {
uint8_t buf[2];
buf[0] = x & 0xff;
buf[1] = (x >> 8) & 0xff;
int r = RingBuffer_write(self, buf, 2);
if (r != 2) return false;
return true;
}
bool RingBuffer_write_word32le(RingBuffer* self, uint32_t x) {
uint8_t buf[4];
buf[0] = x & 0xff;
buf[1] = (x >> 8) & 0xff;
buf[2] = (x >> 16) & 0xff;
buf[3] = (x >> 24) & 0xff;
int r = RingBuffer_write(self, buf, 4);
if (r != 4) return false;
return true;
}
bool RingBuffer_write_word16be(RingBuffer* self, uint16_t x) {
uint8_t buf[2];
buf[1] = x & 0xff;
buf[0] = (x >> 8) & 0xff;
int r = RingBuffer_write(self, buf, 2);
if (r != 2) return false;
return true;
}
bool RingBuffer_write_word32be(RingBuffer* self, uint32_t x) {
uint8_t buf[4];
buf[3] = x & 0xff;
buf[2] = (x >> 8) & 0xff;
buf[1] = (x >> 16) & 0xff;
buf[0] = (x >> 24) & 0xff;
int r = RingBuffer_write(self, buf, 4);
if (r != 4) return false;
return true;
}
bool RingBuffer_write_word24le(RingBuffer* self, uint32_t x) {
uint8_t buf[3];
buf[0] = x & 0xff;
buf[1] = (x >> 8) & 0xff;
buf[2] = (x >> 16) & 0xff;
int r = RingBuffer_write(self, buf, 3);
if (r != 3) return false;
return true;
}
bool RingBuffer_write_word24be(RingBuffer* self, uint32_t x) {
uint8_t buf[3];
buf[2] = x & 0xff;
buf[1] = (x >> 8) & 0xff;
buf[0] = (x >> 16) & 0xff;
int r = RingBuffer_write(self, buf, 3);
if (r != 3) return false;
return true;
}
bool RingBuffer_write_char(RingBuffer* self, uint8_t x) {
uint8_t buf[1];
buf[0] = x;
int r = RingBuffer_write(self, buf, 1);
return r == 1;
}
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