mirror of
https://github.com/monero-project/monero.git
synced 2024-12-15 23:54:24 -05:00
75 lines
2.9 KiB
C++
75 lines
2.9 KiB
C++
// 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 "value_stream.h"
|
|
|
|
#include <stdexcept>
|
|
|
|
#include "common/expect.h"
|
|
#include "lmdb/error.h"
|
|
#include "lmdb/util.h"
|
|
|
|
namespace lmdb
|
|
{
|
|
namespace stream
|
|
{
|
|
mdb_size_t count(MDB_cursor* cur)
|
|
{
|
|
mdb_size_t out = 0;
|
|
if (cur)
|
|
{
|
|
const int rc = mdb_cursor_count(cur, &out);
|
|
if (rc)
|
|
MONERO_THROW(lmdb::error(rc), "mdb_cursor_count");
|
|
}
|
|
return out;
|
|
}
|
|
|
|
std::pair<epee::span<const std::uint8_t>, epee::span<const std::uint8_t>>
|
|
get(MDB_cursor& cur, MDB_cursor_op op, std::size_t key, std::size_t value)
|
|
{
|
|
MDB_val key_bytes{};
|
|
MDB_val value_bytes{};
|
|
const int rc = mdb_cursor_get(&cur, &key_bytes, &value_bytes, op);
|
|
if (rc)
|
|
{
|
|
if (rc == MDB_NOTFOUND)
|
|
return {};
|
|
MONERO_THROW(lmdb::error(rc), "mdb_cursor_get");
|
|
}
|
|
|
|
if (key && key != key_bytes.mv_size)
|
|
MONERO_THROW(lmdb::error(MDB_BAD_VALSIZE), "mdb_cursor_get key");
|
|
|
|
if (value && (value_bytes.mv_size % value != 0 || value_bytes.mv_size == 0))
|
|
MONERO_THROW(lmdb::error(MDB_BAD_VALSIZE), "mdb_cursor_get value");
|
|
|
|
return {lmdb::to_byte_span(key_bytes), lmdb::to_byte_span(value_bytes)};
|
|
}
|
|
}
|
|
}
|
|
|