Implemented basic connection logic

ring_buffer.c

@@ -0,0 +1,99 @@
+#include "ring_buffer.h"
+
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+
+/*
+ * Type definitions
+ */
+typedef struct {
+    char *buffer;
+    uint32_t head;
+    uint32_t tail;
+    uint32_t size;
+} ring_buffer_t;
+
+/*
+ * Public API
+ */
+rb_handle_t rb_allocate(uint32_t size) {
+    ring_buffer_t *rb = calloc(1, sizeof(ring_buffer_t));
+    if (!rb) {
+        return NULL;
+    }
+    rb->buffer = malloc(size);
+    if (!rb->buffer) {
+        free(rb);
+        rb = NULL;
+    }
+    rb->size = size;
+    return rb;
+}
+
+void rb_free(rb_handle_t _rb) {
+    if (!_rb) {
+        return;
+    }
+    ring_buffer_t *rb = _rb;
+    free(rb->buffer);
+    free(rb);
+}
+
+uint32_t rb_get_free_bytes(rb_handle_t _rb) {
+    ring_buffer_t *rb = _rb;
+    if (rb->head == rb->tail) {
+        return rb->size - 1;
+    }
+    if (rb->head < rb->tail) {
+        return rb->tail - rb->head - 1;
+    }
+    return rb->size - (rb->head - rb->tail) - 1;
+}
+
+uint32_t rb_raw_read_size(rb_handle_t _rb) {
+    ring_buffer_t *rb = _rb;
+    if (rb->head == rb->tail) {
+        return 0;
+    }
+    if (rb->head < rb->tail) {
+        return rb->size - rb->tail;
+    }
+    return rb->head - rb->tail;
+}
+
+const void *rb_raw_read_ptr(rb_handle_t _rb) {
+    ring_buffer_t *rb = _rb;
+    return rb->buffer + rb->tail;
+}
+
+uint32_t rb_raw_read_advance(rb_handle_t _rb, uint32_t size) {
+    if (size) {
+        ring_buffer_t *rb = _rb;
+        rb->tail += size;
+        rb->tail %= rb->size;
+    }
+    return rb_raw_read_size(_rb);
+}
+
+uint32_t rb_raw_write_size(rb_handle_t _rb) {
+    ring_buffer_t *rb = _rb;
+    if (rb->head < rb->tail) {
+        return rb->tail - rb->head -1;
+    }
+    return rb->size - rb->head;
+}
+
+void *rb_raw_write_ptr(rb_handle_t _rb) {
+    ring_buffer_t *rb = _rb;
+    return rb->buffer + rb->head;
+}
+
+uint32_t rb_raw_write_advance(rb_handle_t _rb, uint32_t size) {
+    if (size) {
+        ring_buffer_t *rb = _rb;
+        rb->head += size;
+        rb->head %= rb->size;
+    }
+    return rb_raw_write_size(_rb);
+}