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fcb8d040e8
Instead of lengthy blurbs, switch to single-line, machine-readable standardized (https://spdx.dev) license identifiers. The Linux kernel switched long ago, so there is strong precedent. Three cases are handled: AGPL-only, Apache-only, and dual licensed. For the latter case, I chose (AGPL-3.0-or-later and Apache-2.0), reasoning that our changes are extensive enough to apply our license. The changes we applied mechanically with a script, except to licenses/README.md. Closes #9937
43 lines
1.3 KiB
C++
43 lines
1.3 KiB
C++
/*
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* Copyright (C) 2018-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: AGPL-3.0-or-later
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*
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*/
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#pragma once
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#include <cstdint>
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/*
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* Let t_i be the following polynomial depending on i and u:
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*
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* t_i(x, u) = x^(u * 2^(i+3))
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*
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* where:
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*
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* u in { 0, 1 }
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*
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* Let g_k be a multiplication modulo G(x) of t_i(x) for 8 consecutive values of i and 8 values of u (u0 ... u7):
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*
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* g_k(x, u0, u1, ..., u7) = t_(k+0)(x, u_0) * t_(k+1)(x, u_1) * ... * t_(k+7)(x, u_7) mod G(x)
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*
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* The tables below contain representations of g_k(x) polynomials, where the bits of the index
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* correspond to coefficients of u:
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*
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* crc32_x_pow_radix_8_table_base_<k>[u] = g_k(x, (u >> 0) & 1,
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* (u >> 1) & 1,
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* (u >> 2) & 1,
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* (u >> 3) & 1,
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* (u >> 4) & 1,
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* (u >> 5) & 1,
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* (u >> 6) & 1,
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* (u >> 7) & 1)
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*/
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extern uint32_t crc32_x_pow_radix_8_table_base_0[256];
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extern uint32_t crc32_x_pow_radix_8_table_base_8[256];
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extern uint32_t crc32_x_pow_radix_8_table_base_16[256];
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extern uint32_t crc32_x_pow_radix_8_table_base_24[256];
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