Function DecodeFixed32

src/leveldb/util/coding.h:105–122

// without any bounds checking.

inline uint32_t DecodeFixed32(const char* ptr) {
  const uint8_t* const buffer = reinterpret_cast<const uint8_t*>(ptr);

  if (port::kLittleEndian) {
    // Fast path for little-endian CPUs. All major compilers optimize this to a
    // single mov (x86_64) / ldr (ARM) instruction.
    uint32_t result;
    std::memcpy(&result, buffer, sizeof(uint32_t));
    return result;
  }

  // Platform-independent code.
  // Clang and gcc optimize this to a single mov / ldr instruction.
  return (static_cast<uint32_t>(buffer[0])) |
         (static_cast<uint32_t>(buffer[1]) << 8) |
         (static_cast<uint32_t>(buffer[2]) << 16) |
         (static_cast<uint32_t>(buffer[3]) << 24);
}

inline uint64_t DecodeFixed64(const char* ptr) {
  const uint8_t* const buffer = reinterpret_cast<const uint8_t*>(ptr);