From 65d71b1c65b2841a94d0fa1cb95b849afa2cff47 Mon Sep 17 00:00:00 2001
From: "Robin.Mueller" <robin.mueller.m@gmail.com>
Date: Tue, 7 Jul 2020 18:11:36 +0200
Subject: [PATCH] added new ctor, non-allocating

---
 container/SimpleRingBuffer.cpp | 18 +++++++----
 container/SimpleRingBuffer.h   | 57 +++++++++++++++++++++++++++++++---
 2 files changed, 64 insertions(+), 11 deletions(-)

diff --git a/container/SimpleRingBuffer.cpp b/container/SimpleRingBuffer.cpp
index 63dc3514b..731c9dc92 100644
--- a/container/SimpleRingBuffer.cpp
+++ b/container/SimpleRingBuffer.cpp
@@ -1,18 +1,23 @@
 #include <framework/container/SimpleRingBuffer.h>
-#include <string.h>
+#include <cstring>
 
-SimpleRingBuffer::SimpleRingBuffer(uint32_t size, bool overwriteOld) :
-		RingBufferBase<>(0, size, overwriteOld), buffer(NULL) {
+SimpleRingBuffer::SimpleRingBuffer(const size_t size, bool overwriteOld) :
+		RingBufferBase<>(0, size, overwriteOld) {
 	buffer = new uint8_t[size];
 }
 
+SimpleRingBuffer::SimpleRingBuffer(uint8_t *buffer, const size_t size,
+        bool overwriteOld):
+        RingBufferBase<>(0, size, overwriteOld), buffer(buffer) {}
+
+
 SimpleRingBuffer::~SimpleRingBuffer() {
 	delete[] buffer;
 }
 
 ReturnValue_t SimpleRingBuffer::writeData(const uint8_t* data,
 		uint32_t amount) {
-	if (availableWriteSpace() >= amount || overwriteOld) {
+	if (availableWriteSpace() >= amount or overwriteOld) {
 		uint32_t amountTillWrap = writeTillWrap();
 		if (amountTillWrap >= amount) {
 			memcpy(&buffer[write], data, amount);
@@ -38,7 +43,7 @@ ReturnValue_t SimpleRingBuffer::readData(uint8_t* data, uint32_t amount,
 			return HasReturnvaluesIF::RETURN_FAILED;
 		}
 	}
-	if (trueAmount != NULL) {
+	if (trueAmount != nullptr) {
 		*trueAmount = amount;
 	}
 	if (amountTillWrap >= amount) {
@@ -60,9 +65,10 @@ ReturnValue_t SimpleRingBuffer::deleteData(uint32_t amount,
 			return HasReturnvaluesIF::RETURN_FAILED;
 		}
 	}
-	if (trueAmount != NULL) {
+	if (trueAmount != nullptr) {
 		*trueAmount = amount;
 	}
 	incrementRead(amount, READ_PTR);
 	return HasReturnvaluesIF::RETURN_OK;
 }
+
diff --git a/container/SimpleRingBuffer.h b/container/SimpleRingBuffer.h
index 6d7d67e1d..30dd184cd 100644
--- a/container/SimpleRingBuffer.h
+++ b/container/SimpleRingBuffer.h
@@ -2,19 +2,66 @@
 #define FRAMEWORK_CONTAINER_SIMPLERINGBUFFER_H_
 
 #include <framework/container/RingBufferBase.h>
-#include <stddef.h>
+#include <cstddef>
 
+/**
+ * @brief 	Circular buffer implementation, useful for buffering
+ *          into data streams.
+ * @details
+ * Note that the deleteData() has to be called to increment the read pointer.
+ * This class allocated dynamically, so
+ * @ingroup containers
+ */
 class SimpleRingBuffer: public RingBufferBase<> {
 public:
-	SimpleRingBuffer(uint32_t size, bool overwriteOld);
+    /**
+     * This constructor allocates a new internal buffer with the supplied size.
+     * @param size
+     * @param overwriteOld
+     */
+	SimpleRingBuffer(const size_t size, bool overwriteOld);
+	/**
+	 * This constructor takes an external buffer with the specified size.
+	 * @param buffer
+	 * @param size
+	 * @param overwriteOld
+	 */
+	SimpleRingBuffer(uint8_t* buffer, const size_t size, bool overwriteOld);
+
 	virtual ~SimpleRingBuffer();
+
+	/**
+	 * Write to circular buffer and increment write pointer by amount
+	 * @param data
+	 * @param amount
+	 * @return
+	 */
 	ReturnValue_t writeData(const uint8_t* data, uint32_t amount);
-	ReturnValue_t readData(uint8_t* data, uint32_t amount, bool readRemaining = false, uint32_t* trueAmount = NULL);
-	ReturnValue_t deleteData(uint32_t amount, bool deleteRemaining = false, uint32_t* trueAmount = NULL);
+
+	/**
+	 * Read from circular buffer at read pointer
+	 * @param data
+	 * @param amount
+	 * @param readRemaining
+	 * @param trueAmount
+	 * @return
+	 */
+	ReturnValue_t readData(uint8_t* data, uint32_t amount,
+	        bool readRemaining = false, uint32_t* trueAmount = nullptr);
+
+	/**
+	 * Delete data starting by incrementing read pointer
+	 * @param amount
+	 * @param deleteRemaining
+	 * @param trueAmount
+	 * @return
+	 */
+	ReturnValue_t deleteData(uint32_t amount, bool deleteRemaining = false,
+	        uint32_t* trueAmount = nullptr);
 private:
 //	static const uint8_t TEMP_READ_PTR = 1;
 	static const uint8_t READ_PTR = 0;
-	uint8_t* buffer;
+	uint8_t* buffer = nullptr;
 };
 
 #endif /* FRAMEWORK_CONTAINER_SIMPLERINGBUFFER_H_ */
-- 
2.34.1