1 files changed, 52 insertions, 0 deletions
diff --git a/streamingvisitors/src/vespa/vsm/common/charbuffer.h b/streamingvisitors/src/vespa/vsm/common/charbuffer.h
new file mode 100644
index 00000000000..08618a9b973
--- /dev/null
+++ b/streamingvisitors/src/vespa/vsm/common/charbuffer.h
@@ -0,0 +1,52 @@
+// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+#pragma once
+
+#include <vector>
+#include <memory>
+
+namespace vsm {
+
+/**
+ * Simple growable char buffer.
+ **/
+class CharBuffer
+{
+private:
+    std::vector<char> _buffer;
+    size_t            _pos;
+
+public:
+    typedef std::shared_ptr<CharBuffer> SP;
+
+    /**
+     * Creates a char buffer with len bytes.
+     **/
+    CharBuffer(size_t len = 0);
+
+    /**
+     * Copies n bytes from the src array into the underlying buffer at the
+     * current position, and updates the position accordingly.
+     * Resizing will occur if needed.
+     **/
+    void put(const char * src, size_t n);
+
+    /**
+     * Resizes the buffer so that the new length becomes len.
+     * Resizing will not occur if len < current length.
+     **/
+    void resize(size_t len);
+
+    /**
+     * Resets the position to the beginning of the buffer.
+     **/
+    void reset() { _pos = 0; }
+
+    const char * getBuffer() const { return &_buffer[0]; }
+    size_t getLength() const { return _buffer.size(); }
+    size_t getPos() const { return _pos; }
+    size_t getRemaining() const { return getLength() - getPos(); }
+    void put(char c) { put(&c, 1); }
+};
+
+}
+