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// SPDX-License-Identifier: 0BSD
///////////////////////////////////////////////////////////////////////////////
//
/// \file crc64.c
/// \brief CRC64 calculation
//
// Authors: Lasse Collin
// Ilya Kurdyukov
//
///////////////////////////////////////////////////////////////////////////////
#include "check.h"
#include "crc_common.h"
#if defined(CRC_X86_CLMUL)
# define BUILDING_CRC64_CLMUL
# include "crc_x86_clmul.h"
#endif
#ifdef CRC64_GENERIC
/////////////////////////////////
// Generic slice-by-four CRC64 //
/////////////////////////////////
#ifdef WORDS_BIGENDIAN
# define A1(x) ((x) >> 56)
#else
# define A1 A
#endif
// See the comments in crc32_fast.c. They aren't duplicated here.
static uint64_t
crc64_generic(const uint8_t *buf, size_t size, uint64_t crc)
{
crc = ~crc;
#ifdef WORDS_BIGENDIAN
crc = byteswap64(crc);
#endif
if (size > 4) {
while ((uintptr_t)(buf) & 3) {
crc = lzma_crc64_table[0][*buf++ ^ A1(crc)] ^ S8(crc);
--size;
}
const uint8_t *const limit = buf + (size & ~(size_t)(3));
size &= (size_t)(3);
while (buf < limit) {
#ifdef WORDS_BIGENDIAN
const uint32_t tmp = (uint32_t)(crc >> 32)
^ aligned_read32ne(buf);
#else
const uint32_t tmp = (uint32_t)crc
^ aligned_read32ne(buf);
#endif
buf += 4;
crc = lzma_crc64_table[3][A(tmp)]
^ lzma_crc64_table[2][B(tmp)]
^ S32(crc)
^ lzma_crc64_table[1][C(tmp)]
^ lzma_crc64_table[0][D(tmp)];
}
}
while (size-- != 0)
crc = lzma_crc64_table[0][*buf++ ^ A1(crc)] ^ S8(crc);
#ifdef WORDS_BIGENDIAN
crc = byteswap64(crc);
#endif
return ~crc;
}
#endif
#if defined(CRC64_GENERIC) && defined(CRC64_ARCH_OPTIMIZED)
//////////////////////////
// Function dispatching //
//////////////////////////
// If both the generic and arch-optimized implementations are usable, then
// the function that is used is selected at runtime. See crc32_fast.c.
typedef uint64_t (*crc64_func_type)(
const uint8_t *buf, size_t size, uint64_t crc);
static crc64_func_type
crc64_resolve(void)
{
return is_arch_extension_supported()
? &crc64_arch_optimized : &crc64_generic;
}
#ifdef HAVE_FUNC_ATTRIBUTE_CONSTRUCTOR
# define CRC64_SET_FUNC_ATTR __attribute__((__constructor__))
static crc64_func_type crc64_func;
#else
# define CRC64_SET_FUNC_ATTR
static uint64_t crc64_dispatch(const uint8_t *buf, size_t size, uint64_t crc);
static crc64_func_type crc64_func = &crc64_dispatch;
#endif
CRC64_SET_FUNC_ATTR
static void
crc64_set_func(void)
{
crc64_func = crc64_resolve();
return;
}
#ifndef HAVE_FUNC_ATTRIBUTE_CONSTRUCTOR
static uint64_t
crc64_dispatch(const uint8_t *buf, size_t size, uint64_t crc)
{
crc64_set_func();
return crc64_func(buf, size, crc);
}
#endif
#endif
extern LZMA_API(uint64_t)
lzma_crc64(const uint8_t *buf, size_t size, uint64_t crc)
{
#if defined(CRC64_GENERIC) && defined(CRC64_ARCH_OPTIMIZED)
#ifdef CRC_USE_GENERIC_FOR_SMALL_INPUTS
if (size <= 16)
return crc64_generic(buf, size, crc);
#endif
return crc64_func(buf, size, crc);
#elif defined(CRC64_ARCH_OPTIMIZED)
// If arch-optimized version is used unconditionally without runtime
// CPU detection then omitting the generic version and its 8 KiB
// lookup table makes the library smaller.
//
// FIXME: Lookup table isn't currently omitted on 32-bit x86,
// see crc64_table.c.
return crc64_arch_optimized(buf, size, crc);
#else
return crc64_generic(buf, size, crc);
#endif
}
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