diff options
Diffstat (limited to 'qpid/cpp/src/qpid/framing/FrameDecoder.cpp')
-rw-r--r-- | qpid/cpp/src/qpid/framing/FrameDecoder.cpp | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/qpid/cpp/src/qpid/framing/FrameDecoder.cpp b/qpid/cpp/src/qpid/framing/FrameDecoder.cpp new file mode 100644 index 0000000000..90cbbd84a1 --- /dev/null +++ b/qpid/cpp/src/qpid/framing/FrameDecoder.cpp @@ -0,0 +1,81 @@ +/* + * + * 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/FrameDecoder.h" +#include "qpid/framing/Buffer.h" +#include "qpid/log/Statement.h" +#include "qpid/framing/reply_exceptions.h" +#include <algorithm> +#include <string.h> + +namespace qpid { +namespace framing { + +namespace { +/** Append up to n bytes from start of buf to end of bytes. */ +void append(std::vector<char>& bytes, Buffer& buffer, size_t n) { + size_t oldSize = bytes.size(); + if ((n = std::min(n, size_t(buffer.available()))) == 0) + return; + bytes.resize(oldSize+n); + char* p = &bytes[oldSize]; + buffer.getRawData(reinterpret_cast<uint8_t*>(p), n); +} +} + +bool FrameDecoder::decode(Buffer& buffer) { + if (buffer.available() == 0) return false; + if (fragment.empty()) { + if (frame.decode(buffer)) // Decode from buffer + return true; + else // Store fragment + append(fragment, buffer, buffer.available()); + } + else { // Already have a fragment + // Get enough data to decode the frame size. + if (fragment.size() < AMQFrame::DECODE_SIZE_MIN) { + append(fragment, buffer, AMQFrame::DECODE_SIZE_MIN - fragment.size()); + } + if (fragment.size() >= AMQFrame::DECODE_SIZE_MIN) { + uint16_t size = AMQFrame::decodeSize(&fragment[0]); + if (size <= fragment.size()) + throw FramingErrorException(QPID_MSG("Frame size " << size << " is too small.")); + append(fragment, buffer, size-fragment.size()); + Buffer b(&fragment[0], fragment.size()); + if (frame.decode(b)) { + assert(b.available() == 0); + fragment.clear(); + return true; + } + } + } + return false; +} + +void FrameDecoder::setFragment(const char* data, size_t size) { + fragment.resize(size); + ::memcpy(&fragment[0], data, size); +} + +std::pair<const char*, size_t> FrameDecoder::getFragment() const { + return std::pair<const char*, size_t>(&fragment[0], fragment.size()); +} + +}} // namespace qpid::framing |