getFreeElement implemented

container/SimpleRingBuffer.cpp

@@ -1,20 +1,43 @@
 #include <framework/container/SimpleRingBuffer.h>
 #include <cstring>
 
-SimpleRingBuffer::SimpleRingBuffer(const size_t size, bool overwriteOld) :
+SimpleRingBuffer::SimpleRingBuffer(const size_t size, bool overwriteOld,
-		RingBufferBase<>(0, size, overwriteOld) {
+        size_t maxExcessBytes) :
-	buffer = new uint8_t[size];
+		RingBufferBase<>(0, size, overwriteOld),
+		maxExcessBytes(maxExcessBytes) {
+	buffer = new uint8_t[size + maxExcessBytes];
 }
 
 SimpleRingBuffer::SimpleRingBuffer(uint8_t *buffer, const size_t size,
-        bool overwriteOld):
+        bool overwriteOld, size_t maxExcessBytes):
-        RingBufferBase<>(0, size, overwriteOld), buffer(buffer) {}
+        RingBufferBase<>(0, size, overwriteOld), buffer(buffer),
+        maxExcessBytes(maxExcessBytes) {}
 
 
 SimpleRingBuffer::~SimpleRingBuffer() {
 	delete[] buffer;
 }
 
+
+ReturnValue_t SimpleRingBuffer::getFreeElement(uint8_t **writePointer,
+        size_t amount) {
+    if (availableWriteSpace() >= amount or overwriteOld) {
+        size_t amountTillWrap = writeTillWrap();
+        if (amountTillWrap < amount) {
+            if((amount - amountTillWrap + excessBytes) > maxExcessBytes) {
+                return HasReturnvaluesIF::RETURN_FAILED;
+            }
+            excessBytes += amount - amountTillWrap;
+        }
+        *writePointer = &buffer[write];
+        incrementWrite(amount);
+        return HasReturnvaluesIF::RETURN_OK;
+    }
+    else {
+        return HasReturnvaluesIF::RETURN_FAILED;
+    }
+}
+
 ReturnValue_t SimpleRingBuffer::writeData(const uint8_t* data,
 		size_t amount) {
 	if (availableWriteSpace() >= amount or overwriteOld) {
@@ -62,6 +85,17 @@ ReturnValue_t SimpleRingBuffer::readData(uint8_t* data, size_t amount,
 	return HasReturnvaluesIF::RETURN_OK;
 }
 
+size_t SimpleRingBuffer::getExcessBytes() const {
+    return excessBytes;
+}
+
+void SimpleRingBuffer::moveExcessBytesToStart() {
+    if(excessBytes > 0) {
+        std::memcpy(buffer, &buffer[size], excessBytes);
+        excessBytes = 0;
+    }
+}
+
 ReturnValue_t SimpleRingBuffer::deleteData(size_t amount,
 		bool deleteRemaining, size_t* trueAmount) {
 	size_t availableData = availableReadData(READ_PTR);

container/SimpleRingBuffer.h

@@ -64,6 +64,14 @@ public:
 	 */
 	ReturnValue_t getFreeElement(uint8_t** writePointer, size_t amount);
 
+	size_t getExcessBytes() const;
+	/**
+	 * Helper functions which moves any excess bytes to the start
+	 * of the ring buffer.
+	 * @return
+	 */
+	void moveExcessBytesToStart();
+
 	/**
 	 * Read from circular buffer at read pointer.
 	 * @param data