uuid_v4.h兼容X86和AArch64架构

common/include/uuid_v4_arm.h

@@ -0,0 +1,201 @@
+/*
+MIT License
+
+Copyright (c) 2018 Xavier "Crashoz" Launey
+*/
+
+#pragma once
+
+#include <random>
+#include <string>
+#include <limits>
+#include <iostream>
+#include <sstream>
+#include <cstdint>
+#include <memory>
+#include <cstring>
+
+namespace UUIDv4 {
+
+/*
+  Converts a 128-bit unsigned int to a UUIDv4 string representation.
+ */
+void inline uint128_to_uuid_string(const uint64_t* data, char* res) {
+  static const char* hex = "0123456789abcdef";
+  for (int i = 0, j = 0; i < 16; ++i) {
+    uint8_t byte = ((uint8_t*)data)[i];
+    res[j++] = hex[byte >> 4];
+    res[j++] = hex[byte & 0x0F];
+    if (j == 8 || j == 13 || j == 18 || j == 23) {
+      res[j++] = '-';
+    }
+  }
+  res[36] = '\0';
+}
+
+/*
+  Converts a UUIDv4 string representation to a 128-bit unsigned int.
+ */
+void inline uuid_string_to_uint128(const char* str, uint64_t* data) {
+  uint8_t* bytes = (uint8_t*)data;
+  for (int i = 0, j = 0; i < 16; ++i, j += 2) {
+    if (str[j] == '-') ++j;
+    char c1 = str[j];
+    char c2 = str[j + 1];
+    bytes[i] = ((c1 >= '0' && c1 <= '9') ? (c1 - '0') : (c1 - 'a' + 10)) << 4;
+    bytes[i] |= (c2 >= '0' && c2 <= '9') ? (c2 - '0') : (c2 - 'a' + 10);
+  }
+}
+
+/*
+ * UUIDv4 (random 128-bit) RFC-4122
+ */
+class UUID {
+  public:
+    UUID() {}
+
+    UUID(const UUID &other) {
+      std::memcpy(data, other.data, sizeof(data));
+    }
+
+    /* Builds a 128-bit UUID */
+    UUID(uint64_t x, uint64_t y) {
+      data[0] = x;
+      data[1] = y;
+    }
+
+    UUID(const uint8_t* bytes) {
+      std::memcpy(data, bytes, sizeof(data));
+    }
+
+    /* Builds a UUID from a byte string (16 bytes long) */
+    explicit UUID(const std::string &bytes) {
+      std::memcpy(data, bytes.data(), sizeof(data));
+    }
+
+    /* Static factory to parse a UUID from its string representation */
+    static UUID fromStrFactory(const std::string &s) {
+      return fromStrFactory(s.c_str());
+    }
+
+    static UUID fromStrFactory(const char* raw) {
+      UUID uuid;
+      uuid_string_to_uint128(raw, uuid.data);
+      return uuid;
+    }
+
+    void fromStr(const char* raw) {
+      uuid_string_to_uint128(raw, data);
+    }
+
+    UUID& operator=(const UUID &other) {
+      if (&other == this) {
+        return *this;
+      }
+      std::memcpy(data, other.data, sizeof(data));
+      return *this;
+    }
+
+    friend bool operator==(const UUID &lhs, const UUID &rhs) {
+      return lhs.data[0] == rhs.data[0] && lhs.data[1] == rhs.data[1];
+    }
+
+    friend bool operator<(const UUID &lhs, const UUID &rhs) {
+      return std::memcmp(lhs.data, rhs.data, sizeof(lhs.data)) < 0;
+    }
+
+    friend bool operator!=(const UUID &lhs, const UUID &rhs) { return !(lhs == rhs); }
+    friend bool operator>(const UUID &lhs, const UUID &rhs) { return rhs < lhs; }
+    friend bool operator<=(const UUID &lhs, const UUID &rhs) { return !(lhs > rhs); }
+    friend bool operator>=(const UUID &lhs, const UUID &rhs) { return !(lhs < rhs); }
+
+    /* Serializes the uuid to a byte string (16 bytes) */
+    std::string bytes() const {
+      return std::string((char*)data, sizeof(data));
+    }
+
+    void bytes(std::string &out) const {
+      out.assign((char*)data, sizeof(data));
+    }
+
+    void bytes(char* bytes) const {
+      std::memcpy(bytes, data, sizeof(data));
+    }
+
+    /* Converts the uuid to its string representation */
+    std::string str() const {
+      char mem[37];
+      uint128_to_uuid_string(data, mem);
+      return std::string(mem, 36);
+    }
+
+    void str(std::string &s) const {
+      char mem[37];
+      uint128_to_uuid_string(data, mem);
+      s.assign(mem, 36);
+    }
+
+    void str(char *res) const {
+      uint128_to_uuid_string(data, res);
+    }
+
+    friend std::ostream& operator<<(std::ostream& stream, const UUID& uuid) {
+      return stream << uuid.str();
+    }
+
+    friend std::istream& operator>>(std::istream& stream, UUID& uuid) {
+      std::string s;
+      stream >> s;
+      uuid = fromStrFactory(s);
+      return stream;
+    }
+
+    size_t hash() const {
+      const uint64_t a = data[0];
+      const uint64_t b = data[1];
+      return a ^ (b + 0x9e3779b9 + (a << 6) + (a >> 2));
+    }
+
+  private:
+    alignas(16) uint64_t data[2];
+};
+
+/*
+  Generates UUIDv4 from a provided random generator (C++11 <random> module)
+  std::mt19937_64 is highly recommended as it has a SIMD implementation that
+  makes it very fast and it produces high quality randomness.
+ */
+template <typename RNG>
+class UUIDGenerator {
+  public:
+    UUIDGenerator() : generator(new RNG(std::random_device()())), distribution(std::numeric_limits<uint64_t>::min(), std::numeric_limits<uint64_t>::max()) {}
+
+    UUIDGenerator(uint64_t seed) : generator(new RNG(seed)), distribution(std::numeric_limits<uint64_t>::min(), std::numeric_limits<uint64_t>::max()) {}
+
+    UUIDGenerator(RNG &gen) : generator(gen), distribution(std::numeric_limits<uint64_t>::min(), std::numeric_limits<uint64_t>::max()) {}
+
+    /* Generates a new UUID */
+    UUID getUUID() {
+      uint64_t x = distribution(*generator);
+      uint64_t y = distribution(*generator);
+      // The two masks set the uuid version (4) and variant (1)
+      x = (x & 0xFFFFFFFFFFFF0FFFULL) | 0x0000000000004000ULL;
+      y = (y & 0x3FFFFFFFFFFFFFFFULL) | 0x8000000000000000ULL;
+      return UUID(x, y);
+    }
+
+  private:
+    std::shared_ptr<RNG> generator;
+    std::uniform_int_distribution<uint64_t> distribution;
+};
+
+}
+
+namespace std {
+  template <> struct hash<UUIDv4::UUID>
+  {
+    size_t operator()(const UUIDv4::UUID &uuid) const {
+      return uuid.hash();
+    }
+  };
+}