Move FIFOBuffer to src dir

src/misc/FIFOBuffer.c

@@ -0,0 +1,95 @@
+#include <stdint.h>
+#include <stdbool.h>
+#include <stddef.h>
+#include "FIFOBuffer.h"
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+ bool fifo_isempty(const FIFOBuffer *f) {
+  return f->head == f->tail;
+}
+
+ bool fifo_isfull(const FIFOBuffer *f) {
+  return ((f->head == f->begin) && (f->tail == f->end)) || (f->tail == f->head - 1);
+}
+
+ void fifo_push(FIFOBuffer *f, unsigned char c) {
+  *(f->tail) = c;
+  
+  if (f->tail == f->end) {
+    f->tail = f->begin;
+  } else {
+    f->tail++;
+  }
+}
+
+ unsigned char fifo_pop(FIFOBuffer *f) {
+  if(f->head == f->end) {
+    f->head = f->begin;
+    return *(f->end);
+  } else {
+    return *(f->head++);
+  }
+}
+
+ void fifo_flush(FIFOBuffer *f) {
+  f->head = f->tail;
+}
+
+
+ void fifo_init(FIFOBuffer *f, unsigned char *buffer, size_t size) {
+  f->head = f->tail = f->begin = buffer;
+  f->end = buffer + size;
+}
+
+// todo, fix this so it actually displays the amount of data in the fifo
+// buffer, not just the size allocated for the buffer
+ size_t fifo_len(FIFOBuffer *f) {
+  return f->end - f->begin;
+}
+
+ bool fifo16_isempty(const FIFOBuffer16 *f) {
+  return f->head == f->tail;
+}
+
+ bool fifo16_isfull(const FIFOBuffer16 *f) {
+  return ((f->head == f->begin) && (f->tail == f->end)) || (f->tail == f->head - 1);
+}
+
+ void fifo16_push(FIFOBuffer16 *f, uint16_t c) {
+  *(f->tail) = c;
+
+  if (f->tail == f->end) {
+    f->tail = f->begin;
+  } else {
+    f->tail++;
+  }
+}
+
+ uint16_t fifo16_pop(FIFOBuffer16 *f) {
+  if(f->head == f->end) {
+    f->head = f->begin;
+    return *(f->end);
+  } else {
+    return *(f->head++);
+  }
+}
+
+ void fifo16_flush(FIFOBuffer16 *f) {
+  f->head = f->tail;
+}
+
+ void fifo16_init(FIFOBuffer16 *f, uint16_t *buffer, uint16_t size) {
+  f->head = f->tail = f->begin = buffer;
+  f->end = buffer + size;
+}
+
+ uint16_t fifo16_len(FIFOBuffer16 *f) {
+  return (f->end - f->begin);
+}
+
+#ifdef __cplusplus
+}
+#endif

src/misc/FIFOBuffer.h

@@ -0,0 +1,59 @@
+#ifndef FIFOBUFFER_H
+
+#define FIFOBUFFER_H
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+/* An 8 bit FIFO buffer implementation */
+typedef struct FIFOBuffer
+{
+  unsigned char *begin;
+  unsigned char *end;
+  unsigned char * volatile head;
+  unsigned char * volatile tail;
+} FIFOBuffer;
+
+bool fifo_isempty(const FIFOBuffer *f);
+
+bool fifo_isfull(const FIFOBuffer *f);
+
+void fifo_push(FIFOBuffer *f, unsigned char c);
+
+unsigned char fifo_pop(FIFOBuffer *f);
+
+void fifo_flush(FIFOBuffer *f);
+
+void fifo_init(FIFOBuffer *f, unsigned char *buffer, size_t size);
+
+size_t fifo_len(FIFOBuffer *f);
+
+/* A 16-bit implementation of the same FIFO buffer. */
+typedef struct FIFOBuffer16
+{
+  uint16_t *begin;
+  uint16_t *end;
+  uint16_t * volatile head;
+  uint16_t * volatile tail;
+} FIFOBuffer16;
+
+bool fifo16_isempty(const FIFOBuffer16 *f);
+
+bool fifo16_isfull(const FIFOBuffer16 *f);
+
+void fifo16_push(FIFOBuffer16 *f, uint16_t c);
+
+uint16_t fifo16_pop(FIFOBuffer16 *f);
+
+void fifo16_flush(FIFOBuffer16 *f);
+
+void fifo16_init(FIFOBuffer16 *f, uint16_t *buffer, uint16_t size);
+
+uint16_t fifo16_len(FIFOBuffer16 *f);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif