mirror of
https://github.com/nzbget/nzbget.git
synced 2025-12-25 15:17:44 -05:00
103 lines
2.4 KiB
C++
103 lines
2.4 KiB
C++
/*
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* Based on node-yencode library by Anime Tosho:
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* https://github.com/animetosho/node-yencode
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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// inspired off https://github.com/jocover/crc32_armv8/blob/master/crc32_armv8.c
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#include "nzbget.h"
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#include "YEncode.h"
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#ifdef __ARM_FEATURE_CRC32
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#include <arm_acle.h>
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#endif
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namespace YEncode
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{
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#ifdef __ARM_FEATURE_CRC32
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void crc_arm_init(crc_state *const s)
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{
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s->crc0[0] = ~0;
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}
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void crc_arm(crc_state *const s, const unsigned char *src, long len) {
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uint32_t crc = s->crc0[0];
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// initial alignment
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if (len >= 16) { // 16 is an arbitrary number; it just needs to be >=8
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if ((uintptr_t)src & sizeof(uint8_t)) {
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crc = __crc32b(crc, *src);
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src++;
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len--;
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}
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if ((uintptr_t)src & sizeof(uint16_t)) {
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crc = __crc32h(crc, *((uint16_t *)src));
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src += sizeof(uint16_t);
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len -= sizeof(uint16_t);
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}
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#ifdef __aarch64__
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if ((uintptr_t)src & sizeof(uint32_t)) {
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crc = __crc32w(crc, *((uint32_t *)src));
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src += sizeof(uint32_t);
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len -= sizeof(uint32_t);
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}
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}
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while ((len -= sizeof(uint64_t)) >= 0) {
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crc = __crc32d(crc, *((uint64_t *)src));
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src += sizeof(uint64_t);
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}
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if (len & sizeof(uint32_t)) {
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crc = __crc32w(crc, *((uint32_t *)src));
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src += sizeof(uint32_t);
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}
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#else
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}
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while ((len -= sizeof(uint32_t)) >= 0) {
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crc = __crc32w(crc, *((uint32_t *)src));
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src += sizeof(uint32_t);
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}
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#endif
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if (len & sizeof(uint16_t)) {
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crc = __crc32h(crc, *((uint16_t *)src));
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src += sizeof(uint16_t);
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}
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if (len & sizeof(uint8_t))
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crc = __crc32b(crc, *src);
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s->crc0[0] = crc;
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}
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uint32_t crc_arm_finish(crc_state *const s)
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{
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return ~s->crc0[0];
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}
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#endif
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void init_crc_acle()
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{
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#ifdef __ARM_FEATURE_CRC32
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crc_init = &crc_arm_init;
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crc_incr = &crc_arm;
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crc_finish = &crc_arm_finish;
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crc_simd = true;
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#endif
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}
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}
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