src/liblzma/check/crc32_table.c

   1 // SPDX-License-Identifier: 0BSD
   2
   3 ///////////////////////////////////////////////////////////////////////////////
   4 //
   5 /// \file       crc32_table.c
   6 /// \brief      Precalculated CRC32 table with correct endianness
   7 //
   8 //  Author:     Lasse Collin
   9 //
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 #include "common.h"
  13
  14
  15 // FIXME: Compared to crc_common.h this has to check for __x86_64__ too
  16 // so that in 32-bit builds crc32_x86.S won't break due to a missing table.
  17 #if defined(HAVE_USABLE_CLMUL) && ((defined(__x86_64__) && defined(__SSSE3__) \
  18                         && defined(__SSE4_1__) && defined(__PCLMUL__)) \
  19                 || (defined(__e2k__) && __iset__ >= 6))
  20 #       define NO_CRC32_TABLE
  21
  22 #elif defined(HAVE_ARM64_CRC32) \
  23                 && !defined(WORDS_BIGENDIAN) \
  24                 && defined(__ARM_FEATURE_CRC32)
  25 #       define NO_CRC32_TABLE
  26 #endif
  27
  28
  29 #if !defined(HAVE_ENCODERS) && defined(NO_CRC32_TABLE)
  30 // No table needed. Use a typedef to avoid an empty translation unit.
  31 typedef void lzma_crc32_dummy;
  32
  33 #else
  34 // Having the declaration here silences clang -Wmissing-variable-declarations.
  35 extern const uint32_t lzma_crc32_table[8][256];
  36
  37 #       ifdef WORDS_BIGENDIAN
  38 #               include "crc32_table_be.h"
  39 #       else
  40 #               include "crc32_table_le.h"
  41 #       endif
  42 #endif