mirror of https://github.com/monero-project/monero
76 lines
2.9 KiB
C++
76 lines
2.9 KiB
C++
// Copyright (c) 2018-2023, The Monero Project
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without modification, are
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// permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice, this list of
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// conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list
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// of conditions and the following disclaimer in the documentation and/or other
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// materials provided with the distribution.
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//
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// 3. Neither the name of the copyright holder nor the names of its contributors may be
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// used to endorse or promote products derived from this software without specific
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// prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include "value_stream.h"
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#include <stdexcept>
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#include "common/expect.h"
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#include "lmdb/error.h"
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#include "lmdb/util.h"
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namespace lmdb
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{
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namespace stream
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{
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mdb_size_t count(MDB_cursor* cur)
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{
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mdb_size_t out = 0;
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if (cur)
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{
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const int rc = mdb_cursor_count(cur, &out);
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if (rc)
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MONERO_THROW(lmdb::error(rc), "mdb_cursor_count");
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}
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return out;
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}
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std::pair<epee::span<const std::uint8_t>, epee::span<const std::uint8_t>>
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get(MDB_cursor& cur, MDB_cursor_op op, std::size_t key, std::size_t value)
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{
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MDB_val key_bytes{};
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MDB_val value_bytes{};
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const int rc = mdb_cursor_get(&cur, &key_bytes, &value_bytes, op);
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if (rc)
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{
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if (rc == MDB_NOTFOUND)
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return {};
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MONERO_THROW(lmdb::error(rc), "mdb_cursor_get");
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}
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if (key && key != key_bytes.mv_size)
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MONERO_THROW(lmdb::error(MDB_BAD_VALSIZE), "mdb_cursor_get key");
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if (value && (value_bytes.mv_size % value != 0 || value_bytes.mv_size == 0))
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MONERO_THROW(lmdb::error(MDB_BAD_VALSIZE), "mdb_cursor_get value");
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return {lmdb::to_byte_span(key_bytes), lmdb::to_byte_span(value_bytes)};
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}
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}
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}
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