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Diffstat (limited to 'qpid/cpp/src/qpid/framing/ResizableBuffer.h')
-rw-r--r-- | qpid/cpp/src/qpid/framing/ResizableBuffer.h | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/qpid/cpp/src/qpid/framing/ResizableBuffer.h b/qpid/cpp/src/qpid/framing/ResizableBuffer.h new file mode 100644 index 0000000000..0abc5ba7f4 --- /dev/null +++ b/qpid/cpp/src/qpid/framing/ResizableBuffer.h @@ -0,0 +1,60 @@ +#ifndef QPID_FRAMING_RESIZABLEBUFFER_H +#define QPID_FRAMING_RESIZABLEBUFFER_H + +/* + * + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, + * software distributed under the License is distributed on an + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY + * KIND, either express or implied. See the License for the + * specific language governing permissions and limitations + * under the License. + * + */ + +#include "qpid/framing/Buffer.h" +#include <vector> + +namespace qpid { +namespace framing { + +/** + * A buffer that maintains its own storage and can be resized, + * keeping any data already written to the buffer. + */ +class ResizableBuffer : public Buffer +{ + public: + ResizableBuffer(size_t initialSize) : store(initialSize) { + static_cast<Buffer&>(*this) = Buffer(&store[0], store.size()); + } + + void resize(size_t newSize) { + size_t oldPos = getPosition(); + store.resize(newSize); + static_cast<Buffer&>(*this) = Buffer(&store[0], store.size()); + setPosition(oldPos); + } + + /** Make sure at least n bytes are available */ + void makeAvailable(size_t n) { + if (n > available()) + resize(getSize() + n - available()); + } + + private: + std::vector<char> store; +}; +}} // namespace qpid::framing + +#endif /*!QPID_FRAMING_RESIZABLEBUFFER_H*/ |