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/*
* Based on node-yencode library by Anime Tosho:
* https://github.com/animetosho/node-yencode
*
* Copyright (C) 2017 Anime Tosho (animetosho)
* Copyright (C) 2017 Andrey Prygunkov <hugbug@users.sourceforge.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "nzbget.h"
#if (defined(__i686__) || defined(__amd64__)) && !defined(WIN32)
#include <cpuid.h>
#endif
#include "YEncode.h"
namespace YEncode
{
int (*decode)(const unsigned char**, unsigned char**, size_t, YencDecoderState*) = nullptr;
extern void init_decode_scalar();
bool decode_simd = false;
void (*crc_init)(crc_state *const s) = nullptr;
void (*crc_incr)(crc_state *const s, const unsigned char *src, long len) = nullptr;
uint32_t (*crc_finish)(crc_state *const s) = nullptr;
extern void init_crc_slice();
bool crc_simd = false;
#if defined(__i686__) || defined(__amd64__)
extern void init_decode_sse2();
extern void init_decode_ssse3();
extern void init_crc_pclmul();
class CpuId
{
uint32_t regs[4];
public:
CpuId(unsigned level)
{
#ifdef WIN32
__cpuid((int *)regs, (int)level);
#else
__cpuid(level, regs[0], regs[1], regs[2], regs[3]);
#endif
}
const uint32_t &EAX() const {return regs[0];}
const uint32_t &EBX() const {return regs[1];}
const uint32_t &ECX() const {return regs[2];}
const uint32_t &EDX() const {return regs[3];}
};
#endif
#if defined(__arm__) || defined(__aarch64__)
extern void init_decode_neon();
extern void init_crc_acle();
#endif
void init()
{
init_decode_scalar();
init_crc_slice();
#if defined(__i686__) || defined(__amd64__)
CpuId cpuid(1);
bool cpu_supports_sse2 = cpuid.EDX() & 0x04000000;
bool cpu_supports_ssse3 = cpuid.ECX() & 0x00000200;
bool cpu_supports_sse41 = cpuid.ECX() & 0x00080000;
bool cpu_supports_pclmul = cpuid.ECX() & 0x00000002;
if (cpu_supports_sse2)
{
init_decode_sse2();
}
if (cpu_supports_ssse3)
{
init_decode_ssse3();
}
if (cpu_supports_sse41 && cpu_supports_pclmul)
{
init_crc_pclmul();
}
#endif
#if defined(__arm__) || defined(__aarch64__)
bool cpu_supports_neon = false;
bool cpu_supports_crc = false;
#ifdef __linux__
if (FILE* file = fopen("/proc/cpuinfo", "r"))
{
char buf[200];
while (fgets(buf, sizeof(buf), file))
{
cpu_supports_neon |= !strncasecmp(buf, "Features", 8) &&
(strstr(buf, " neon ") || strstr(buf, " asimd "));
cpu_supports_crc |= !strncasecmp(buf, "Features", 8) && strstr(buf, " crc32 ");
}
fclose(file);
}
#endif
if (cpu_supports_neon)
{
init_decode_neon();
}
if (cpu_supports_crc)
{
init_crc_acle();
}
#endif
}
}
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