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73 lines
2.2 KiB
C++
73 lines
2.2 KiB
C++
/*
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* Copyright 2017 Leonid Yuriev <leo@yuriev.ru>
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* and other libmdbx authors: please see AUTHORS file.
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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
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* modification, are permitted only as authorized by the OpenLDAP
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* Public License.
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*
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* A copy of this license is available in the file LICENSE in the
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* top-level directory of the distribution or, alternatively, at
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* <http://www.OpenLDAP.org/license.html>.
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*/
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#include "test.h"
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namespace keygen {
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size_t ffs_fallback(serial_t serial) {
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size_t bit = sizeof(serial_t) * 8 - 1;
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auto mask = (serial_t)1u << bit;
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do {
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if (serial & mask)
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return bit;
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--bit;
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} while (mask >>= 1);
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return 0;
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}
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void __hot make(const serial_t serial, const params_t ¶ms, result_t &out) {
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assert(out.limit >= params.maxlen);
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assert(params.maxlen >= params.minlen);
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assert(params.maxlen >= length(serial));
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out.value.mv_data = out.bytes;
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out.value.mv_size = params.minlen;
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if (params.flags & (MDB_INTEGERKEY | MDB_INTEGERDUP)) {
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assert(params.maxlen == params.minlen);
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assert(params.minlen == 4 || params.minlen == 8);
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if (is_byteorder_le() || params.minlen == 8)
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out.u64 = serial;
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else
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out.u32 = (uint32_t)serial;
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} else if (params.flags & (MDB_REVERSEKEY | MDB_REVERSEDUP)) {
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if (out.value.mv_size > 8) {
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memset(out.bytes, '\0', out.value.mv_size - 8);
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unaligned::store(out.bytes + out.value.mv_size - 8, htobe64(serial));
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} else {
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out.u64 = htobe64(serial);
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if (out.value.mv_size < 8) {
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out.value.mv_size = std::max(length(serial), out.value.mv_size);
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out.value.mv_data = out.bytes + 8 - out.value.mv_size;
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}
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}
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} else {
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out.u64 = htole64(serial);
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if (out.value.mv_size > 8)
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memset(out.bytes + 8, '\0', out.value.mv_size - 8);
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else
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out.value.mv_size = std::max(length(serial), out.value.mv_size);
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}
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assert(out.value.mv_size >= params.minlen);
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assert(out.value.mv_size <= params.maxlen);
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assert(out.value.mv_size >= length(serial));
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assert(out.value.mv_data >= out.bytes);
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assert((uint8_t *)out.value.mv_data + out.value.mv_size <=
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out.bytes + out.limit);
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}
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} /* namespace keygen */
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