You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
99 lines
3.7 KiB
99 lines
3.7 KiB
// Copyright (c) 2018, The Monero Project
|
|
//
|
|
// All rights reserved.
|
|
//
|
|
// Redistribution and use in source and binary forms, with or without modification, are
|
|
// permitted provided that the following conditions are met:
|
|
//
|
|
// 1. Redistributions of source code must retain the above copyright notice, this list of
|
|
// conditions and the following disclaimer.
|
|
//
|
|
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
|
|
// of conditions and the following disclaimer in the documentation and/or other
|
|
// materials provided with the distribution.
|
|
//
|
|
// 3. Neither the name of the copyright holder nor the names of its contributors may be
|
|
// used to endorse or promote products derived from this software without specific
|
|
// prior written permission.
|
|
//
|
|
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
|
|
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
|
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
|
|
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
|
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
|
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
|
|
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
#include <string.h>
|
|
#include "net/buffer.h"
|
|
|
|
#undef MONERO_DEFAULT_LOG_CATEGORY
|
|
#define MONERO_DEFAULT_LOG_CATEGORY "net.buffer"
|
|
|
|
namespace epee
|
|
{
|
|
namespace net_utils
|
|
{
|
|
|
|
void buffer::append(const void *data, size_t sz)
|
|
{
|
|
const size_t capacity = storage.capacity();
|
|
const size_t avail = capacity - storage.size();
|
|
|
|
CHECK_AND_ASSERT_THROW_MES(storage.size() < std::numeric_limits<size_t>::max() - sz, "Too much data to append");
|
|
|
|
// decide when to move
|
|
if (sz > avail)
|
|
{
|
|
// we have to reallocate or move
|
|
const bool move = size() + sz <= capacity;
|
|
if (move)
|
|
{
|
|
const size_t bytes = storage.size() - offset;
|
|
NET_BUFFER_LOG("appending " << sz << " from " << size() << " by moving " << bytes << " from offset " << offset << " first (forced)");
|
|
memmove(storage.data(), storage.data() + offset, bytes);
|
|
storage.resize(bytes);
|
|
offset = 0;
|
|
}
|
|
else
|
|
{
|
|
NET_BUFFER_LOG("appending " << sz << " from " << size() << " by reallocating");
|
|
std::vector<uint8_t> new_storage;
|
|
size_t reserve = (((size() + sz) * 3 / 2) + 4095) & ~4095;
|
|
new_storage.reserve(reserve);
|
|
new_storage.resize(size());
|
|
if (size() > 0)
|
|
memcpy(new_storage.data(), storage.data() + offset, storage.size() - offset);
|
|
offset = 0;
|
|
std::swap(storage, new_storage);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// we have space already
|
|
if (size() <= 4096 && offset > 4096 * 16 && offset >= capacity / 2)
|
|
{
|
|
// we have little to move, and we're far enough into the buffer that it's probably a win to move anyway
|
|
const size_t pos = storage.size() - offset;
|
|
NET_BUFFER_LOG("appending " << sz << " from " << size() << " by moving " << pos << " from offset " << offset << " first (unforced)");
|
|
memmove(storage.data(), storage.data() + offset, storage.size() - offset);
|
|
storage.resize(pos);
|
|
offset = 0;
|
|
}
|
|
else
|
|
{
|
|
NET_BUFFER_LOG("appending " << sz << " from " << size() << " by writing to existing capacity");
|
|
}
|
|
}
|
|
|
|
// add the new data
|
|
storage.insert(storage.end(), (const uint8_t*)data, (const uint8_t*)data + sz);
|
|
|
|
NET_BUFFER_LOG("storage now " << offset << "/" << storage.size() << "/" << storage.capacity());
|
|
}
|
|
|
|
}
|
|
}
|