Code/Engine/Foundation/Algorithm/Implementation/HashingUtils.cpp - dev - redgpu/ezEngine

Code/Engine/Foundation/Algorithm/Implementation/HashingUtils.cpp
219 строк7 KB
C-Core
Fixes for non-unity android build
17 июн 2024, 13:29
17 июн 2024, 13:297600171
#include <Foundation/FoundationPCH.h>

#include <Foundation/Algorithm/HashingUtils.h>
#include <Foundation/Memory/MemoryUtils.h>

// static
ezUInt32 ezHashingUtils::MurmurHash32(const void* pKey, size_t uiSizeInByte, ezUInt32 uiSeed /*= 0*/)
{
  const ezUInt32 m = ezInternal::MURMUR_M;
  const ezUInt32 r = ezInternal::MURMUR_R;

  // Initialize the hash to a 'random' value
  ezUInt32 h = uiSeed ^ (ezUInt32)uiSizeInByte;

#if EZ_ENABLED(EZ_PLATFORM_ARCH_ARM)
  // ARM has strict alignment requirements for reading. Special version which takes care of unaligned inputs.
  if (reinterpret_cast<size_t>(pKey) % 4 != 0)
  {
    // If the input is unaligned use the "slow" version.

    // Mix 4 bytes at a time into the hash
    while (uiSizeInByte >= 4)
    {
      ezUInt32 k = 0;
      memcpy(&k, pKey, sizeof(k));
      pKey = ezMemoryUtils::AddByteOffset(pKey, sizeof(k));

      k *= m;
      k ^= k >> r;
      k *= m;

      h *= m;
      h ^= k;

      uiSizeInByte -= 4;
    }
  }
  else
#endif
  {
    const ezUInt32* pData = static_cast<const ezUInt32*>(pKey);

    // Mix 4 bytes at a time into the hash
    while (uiSizeInByte >= 4)
    {
      ezUInt32 k = *pData++;

      k *= m;
      k ^= k >> r;
      k *= m;

      h *= m;
      h ^= k;

      uiSizeInByte -= 4;
    }

    pKey = pData;
  }

  const ezUInt8* pData2 = reinterpret_cast<const ezUInt8*>(pKey);

  // Handle the last few bytes of the input array
  switch (uiSizeInByte)
  {
    case 3:
      h ^= pData2[2] << 16;
    case 2:
      h ^= pData2[1] << 8;
    case 1:
      h ^= pData2[0];
      h *= m;
  };

  // Do a few final mixes of the hash to ensure the last few
  // bytes are well-incorporated.
  h ^= h >> 13;
  h *= m;
  h ^= h >> 15;

  return h;
}

// static
ezUInt64 ezHashingUtils::MurmurHash64(const void* pKey, size_t uiSizeInByte, ezUInt64 uiSeed /*= 0*/)
{
  const ezUInt64 m = 0xc6a4a7935bd1e995ULL;
  const ezUInt64 r = 47;

  ezUInt64 h = uiSeed ^ (uiSizeInByte * m);

#if EZ_ENABLED(EZ_PLATFORM_ARCH_ARM)
  if (reinterpret_cast<size_t>(pKey) % 8 != 0)
  {
    const void* pData = static_cast<const ezUInt8*>(pKey);
    const void* pEnd = ezMemoryUtils::AddByteOffset(pKey, (uiSizeInByte / 8) * 8);

    while (pData != pEnd)
    {
      ezUInt64 k = 0;
      memcpy(&k, pData, sizeof(k));
      pData = ezMemoryUtils::AddByteOffset(pData, sizeof(k));

      k *= m;
      k ^= k >> r;
      k *= m;

      h ^= k;
      h *= m;
    }

    pKey = pEnd;
  }
  else
#endif
  {
    const ezUInt64* pData = static_cast<const ezUInt64*>(pKey);
    const ezUInt64* pEnd = pData + (uiSizeInByte / 8);

    while (pData != pEnd)
    {
      ezUInt64 k = *pData++;

      k *= m;
      k ^= k >> r;
      k *= m;

      h ^= k;
      h *= m;
    }

    pKey = pEnd;
  }

  const ezUInt8* pData2 = reinterpret_cast<const ezUInt8*>(pKey);

  switch (uiSizeInByte & 7)
  {
    case 7:
      h ^= ezUInt64(pData2[6]) << 48;
    case 6:
      h ^= ezUInt64(pData2[5]) << 40;
    case 5:
      h ^= ezUInt64(pData2[4]) << 32;
    case 4:
      h ^= ezUInt64(pData2[3]) << 24;
    case 3:
      h ^= ezUInt64(pData2[2]) << 16;
    case 2:
      h ^= ezUInt64(pData2[1]) << 8;
    case 1:
      h ^= ezUInt64(pData2[0]);
      h *= m;
  };

  h ^= h >> r;
  h *= m;
  h ^= h >> r;

  return h;
}

// CRC32 lookup table (precomputed)
static constexpr ezUInt32 uiCRC32Table[256] = {0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3, 0x0EDB8832,
  0x79DCB8A4, 0xE0D5E91E, 0x97D2D988, 0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91, 0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE, 0x1ADAD47D,
  0x6DDDE4EB, 0xF4D4B551, 0x83D385C7, 0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5, 0x3B6E20C8,
  0x4C69105E, 0xD56041E4, 0xA2677172, 0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B, 0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940, 0x32D86CE3,
  0x45DF5C75, 0xDCD60DCF, 0xABD13D59, 0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F, 0x2802B89E,
  0x5F058808, 0xC60CD9B2, 0xB10BE924, 0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D, 0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A, 0x71B18589,
  0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433, 0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01, 0x6B6B51F4,
  0x1C6C6162, 0x856530D8, 0xF262004E, 0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457, 0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF,
  0x15DA2D49, 0x8CD37CF3, 0xFBD44C65, 0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB, 0x4369E96A,
  0x346ED9FC, 0xAD678846, 0xDA60B8D0, 0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9, 0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086, 0x5768B525,
  0x206F85B3, 0xB966D409, 0xCE61E49F, 0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD, 0xEDB88320,
  0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A, 0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683, 0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B,
  0x9309FF9D, 0x0A00AE27, 0x7D079EB1, 0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7, 0xFED41B76,
  0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC, 0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5, 0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1,
  0xA6BC5767, 0x3FB506DD, 0x48B2364B, 0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79, 0xCB61B38C,
  0xBC66831A, 0x256FD2A0, 0x5268E236, 0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F, 0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7,
  0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D, 0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713, 0x95BF4A82,
  0xE2B87A14, 0x7BB12BAE, 0x0CB61B38, 0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21, 0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E, 0x81BE16CD,
  0xF6B9265B, 0x6FB077E1, 0x18B74777, 0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45, 0xA00AE278,
  0xD70DD2EE, 0x4E048354, 0x3903B3C2, 0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB, 0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0, 0xA9BCAE53,
  0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9, 0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF, 0xB3667A2E,
  0xC4614AB8, 0x5D681B02, 0x2A6F2B94, 0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D};

// static
ezUInt32 ezHashingUtils::CRC32Hash(const void* pKey, size_t uiSizeInBytes)
{
  if (pKey == 0 || uiSizeInBytes <= 0)
    return 0;

  ezUInt32 uiCRC32 = 0xFFFFFFFF;

  for (size_t i = 0; i < uiSizeInBytes; i++)
    uiCRC32 = (uiCRC32 >> 8) ^ uiCRC32Table[(uiCRC32 & 0xFF) ^ static_cast<const ezUInt8*>(pKey)[i]];

  return static_cast<ezUInt32>(uiCRC32 ^ 0xFFFFFFFF);
}

EZ_WARNING_PUSH()
EZ_WARNING_DISABLE_CLANG("-Wunused-function")

#define XXH_INLINE_ALL
#include <Foundation/ThirdParty/xxHash/xxhash.h>

EZ_WARNING_POP()

// static
ezUInt32 ezHashingUtils::xxHash32(const void* pKey, size_t uiSizeInByte, ezUInt32 uiSeed /*= 0*/)
{
  return XXH32(pKey, uiSizeInByte, uiSeed);
}

// static
ezUInt64 ezHashingUtils::xxHash64(const void* pKey, size_t uiSizeInByte, ezUInt64 uiSeed /*= 0*/)
{
  return XXH64(pKey, uiSizeInByte, uiSeed);
}