mirror of
https://github.com/isar/libmdbx.git
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239 lines
8.0 KiB
C++
239 lines
8.0 KiB
C++
/*
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* Copyright 2017-2018 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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static inline __pure_function serial_t mask(unsigned bits) {
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assert(bits > 0 && bits <= serial_maxwith);
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return serial_allones >> (serial_maxwith - bits);
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}
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/* LY: https://en.wikipedia.org/wiki/Injective_function */
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serial_t injective(const serial_t serial,
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const unsigned bits /* at least serial_minwith (8) */,
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const serial_t salt) {
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assert(bits > serial_minwith && bits <= serial_maxwith);
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/* LY: All these "magic" prime numbers were found
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* and verified with a bit of brute force. */
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static const uint64_t m[64 - serial_minwith] = {
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/* 8 - 24 */
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113, 157, 397, 653, 1753, 5641, 9697, 23873, 25693, 80833, 105953, 316937,
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309277, 834497, 1499933, 4373441, 10184137,
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/* 25 - 64 */
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10184137, 17279209, 33990377, 67295161, 284404553, 1075238767, 6346721573,
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6924051577, 19204053433, 45840188887, 53625693977, 73447827913,
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141638870249, 745683604649, 1283334050489, 1100828289853, 2201656586197,
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5871903036137, 11238507001417, 45264020802263, 105008404482889,
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81921776907059, 199987980256399, 307207457507641, 946769023178273,
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2420886491930041, 3601632139991929, 11984491914483833, 21805846439714153,
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23171543400565993, 53353226456762893, 155627817337932409,
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227827205384840249, 816509268558278821, 576933057762605689,
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2623957345935638441, 5048241705479929949, 4634245581946485653};
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static const uint8_t s[64 - serial_minwith] = {
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/* 8 - 24 */
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2, 3, 4, 4, 2, 4, 3, 3, 7, 3, 3, 4, 8, 3, 10, 3, 11,
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/* 25 - 64 */
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11, 9, 9, 9, 11, 10, 5, 14, 11, 16, 14, 12, 13, 16, 19, 10, 10, 21, 7, 20,
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10, 14, 22, 19, 3, 21, 18, 19, 26, 24, 2, 21, 25, 29, 24, 10, 11, 14};
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serial_t result = serial * m[bits - 8];
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if (salt) {
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const unsigned left = bits / 2;
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const unsigned right = bits - left;
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result = (result << left) | ((result & mask(bits)) >> right);
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result = (result ^ salt) * m[bits - 8];
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}
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result ^= result << s[bits - 8];
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result &= mask(bits);
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log_trace("keygen-injective: serial %" PRIu64 " into %" PRIu64, serial,
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result);
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return result;
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}
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void __hot maker::pair(serial_t serial, const buffer &key, buffer &value,
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serial_t value_age) {
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assert(mapping.width >= serial_minwith && mapping.width <= serial_maxwith);
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assert(mapping.split <= mapping.width);
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assert(mapping.mesh <= mapping.width);
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assert(mapping.rotate <= mapping.width);
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assert(mapping.offset <= mask(mapping.width));
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assert(!(key_essentials.flags & (MDBX_INTEGERDUP | MDBX_REVERSEDUP)));
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assert(!(value_essentials.flags & (MDBX_INTEGERKEY | MDBX_REVERSEKEY)));
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log_trace("keygen-pair: serial %" PRIu64 ", data-age %" PRIu64, serial,
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value_age);
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if (mapping.mesh >= serial_minwith) {
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serial =
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(serial & ~mask(mapping.mesh)) | injective(serial, mapping.mesh, salt);
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log_trace("keygen-pair: mesh %" PRIu64, serial);
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}
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if (mapping.rotate) {
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const unsigned right = mapping.rotate;
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const unsigned left = mapping.width - right;
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serial = (serial << left) | ((serial & mask(mapping.width)) >> right);
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log_trace("keygen-pair: rotate %" PRIu64 ", 0x%" PRIx64, serial, serial);
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}
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serial = (serial + mapping.offset) & mask(mapping.width);
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log_trace("keygen-pair: offset %" PRIu64, serial);
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serial += base;
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serial_t key_serial = serial;
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serial_t value_serial = value_age;
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if (mapping.split) {
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key_serial = serial >> mapping.split;
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value_serial =
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(serial & mask(mapping.split)) | (value_age << mapping.split);
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}
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log_trace("keygen-pair: key %" PRIu64 ", value %" PRIu64, key_serial,
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value_serial);
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mk(key_serial, key_essentials, *key);
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mk(value_serial, value_essentials, *value);
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if (log_enabled(logging::trace)) {
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char dump_key[128], dump_value[128];
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log_trace("keygen-pair: key %s, value %s",
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mdbx_dkey(&key->value, dump_key, sizeof(dump_key)),
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mdbx_dkey(&value->value, dump_value, sizeof(dump_value)));
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}
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}
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void maker::setup(const config::actor_params_pod &actor,
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unsigned thread_number) {
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key_essentials.flags =
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actor.table_flags & (MDBX_INTEGERKEY | MDBX_REVERSEKEY);
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assert(actor.keylen_min < UINT8_MAX);
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key_essentials.minlen = (uint8_t)actor.keylen_min;
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assert(actor.keylen_max < UINT16_MAX);
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key_essentials.maxlen = (uint16_t)actor.keylen_max;
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value_essentials.flags =
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actor.table_flags & (MDBX_INTEGERDUP | MDBX_REVERSEDUP);
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assert(actor.datalen_min < UINT8_MAX);
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value_essentials.minlen = (uint8_t)actor.datalen_min;
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assert(actor.datalen_max < UINT16_MAX);
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value_essentials.maxlen = (uint16_t)actor.datalen_max;
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assert(thread_number < 2);
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(void)thread_number;
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mapping = actor.keygen;
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salt = actor.keygen.seed * UINT64_C(14653293970879851569);
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// FIXME: TODO
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base = 0;
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}
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bool maker::increment(serial_t &serial, int delta) {
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if (serial > mask(mapping.width)) {
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log_extra("keygen-increment: %" PRIu64 " > %" PRIu64 ", overflow", serial,
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mask(mapping.width));
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return false;
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}
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serial_t target = serial + (int64_t)delta;
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if (target > mask(mapping.width)) {
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log_extra("keygen-increment: %" PRIu64 "%-d => %" PRIu64 ", overflow",
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serial, delta, target);
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return false;
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}
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log_extra("keygen-increment: %" PRIu64 "%-d => %" PRIu64 ", continue", serial,
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delta, target);
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serial = target;
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return true;
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}
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//-----------------------------------------------------------------------------
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size_t length(serial_t serial) {
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size_t n = 0;
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if (serial > UINT32_MAX) {
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n = 4;
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serial >>= 32;
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}
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if (serial > UINT16_MAX) {
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n += 2;
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serial >>= 16;
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}
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if (serial > UINT8_MAX) {
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n += 1;
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serial >>= 8;
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}
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return (serial > 0) ? n + 1 : n;
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}
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buffer alloc(size_t limit) {
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result *ptr = (result *)malloc(sizeof(result) + limit);
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if (unlikely(ptr == nullptr))
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failure_perror("malloc(keyvalue_buffer)", errno);
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ptr->value.iov_base = ptr->bytes;
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ptr->value.iov_len = 0;
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ptr->limit = limit;
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return buffer(ptr);
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}
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void __hot maker::mk(const serial_t serial, const essentials ¶ms,
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result &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.iov_base = out.bytes;
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out.value.iov_len = params.minlen;
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if (params.flags & (MDBX_INTEGERKEY | MDBX_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 & (MDBX_REVERSEKEY | MDBX_REVERSEDUP)) {
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if (out.value.iov_len > 8) {
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memset(out.bytes, '\0', out.value.iov_len - 8);
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unaligned::store(out.bytes + out.value.iov_len - 8, htobe64(serial));
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} else {
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out.u64 = htobe64(serial);
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if (out.value.iov_len < 8) {
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out.value.iov_len = std::max(length(serial), out.value.iov_len);
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out.value.iov_base = out.bytes + 8 - out.value.iov_len;
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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.iov_len > 8)
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memset(out.bytes + 8, '\0', out.value.iov_len - 8);
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else
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out.value.iov_len = std::max(length(serial), out.value.iov_len);
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}
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assert(out.value.iov_len >= params.minlen);
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assert(out.value.iov_len <= params.maxlen);
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assert(out.value.iov_len >= length(serial));
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assert(out.value.iov_base >= out.bytes);
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assert((uint8_t *)out.value.iov_base + out.value.iov_len <=
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out.bytes + out.limit);
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}
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} /* namespace keygen */
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