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/*
*
* 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 "FrameDecoder.h"
#include "Buffer.h"
#include "qpid/log/Statement.h"
#include <algorithm>
#include "qpid/framing/reply_exceptions.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();
n = std::min(n, size_t(buffer.available()));
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;
}
}} // namespace qpid::framing
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