- fixed buffer resize

- added readAt()

git-svn-id: http://moon:8086/svn/software/trunk/libsrc/cpp@949 b431acfa-c32f-4a4a-93f1-934dc6c82436

radio/processor/src/Buffer.tcc

@@ -1,6 +1,3 @@
-#include <cstdio>
-#include <memory>
-#include <cstring>
 
 template<typename T>
 Buffer<T>::Buffer(size_t capacity)
@@ -17,20 +14,33 @@ Buffer<T>::Buffer(size_t capacity)
 template<typename T>
 Buffer<T>::~Buffer()
 {
-    delete [] m_data[0];
-    delete [] m_data[1];
+	resize(0);
 }
 
 template<typename T>
 void Buffer<T>::resize(size_t size)
 {
-    delete [] m_data[0];
-    delete [] m_data[1];
-    m_data[0] = new T[size];
-    m_data[1] = new T[size];
+	const size_t N = sizeof(m_data)/sizeof(m_data[0]);
+	for (int i=0; i < N; i++)
+	{
+		if (m_data[i] != nullptr)
+		{
+			delete m_data[i];
+			m_data[i] = nullptr;
+		}
+	}
 	m_capacity = size;
-
 	clear();
+	if (size == 0)
+	{
+		return;
+	}
+
+	for (int i=0; i < N; i++)
+	{
+		m_data[i] = new T[size];
+	}
+
 }
 
 template<typename T>
@@ -116,6 +126,23 @@ size_t Buffer<T>::read(T* pData, size_t len)
 
 }
 
+template<typename T>
+typename Buffer<T>::Result Buffer<T>::readAt(size_t offset, T &x)
+{
+	if (m_len == 0)
+	{
+		RETURN_OR_EXCEPT(Result::Err_InvalidSize);
+	}
+	size_t n = (m_ri+offset) % m_capacity;
+	x = data_r()[n];
+	if (offset)
+	{
+		consume(1);
+	}
+
+	return Result::Ok;
+}
+
 template<typename T>
 typename Buffer<T>::Result Buffer<T>::consume(size_t len)
 {