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#pragma once
#include "utils.hpp"
#include <stdexcept>
#include <unordered_map>
#include <unordered_set>
namespace odhtdb
{
const int HASH_BYTE_SIZE = 32;
// Source: https://stackoverflow.com/a/11414104 (public license)
static size_t fnvHash(const unsigned char *key, int len)
{
size_t h = 2166136261;
for (int i = 0; i < len; i++)
h = (h * 16777619) ^ key[i];
return h;
}
class HashException : public std::runtime_error
{
public:
HashException(const std::string &errMsg) : std::runtime_error(errMsg) {}
};
class Hash
{
public:
Hash();
// Throws HashException on failure
Hash(const void *input, const size_t inputSize);
Hash(const Hash &other);
void* getData() const { return (void*)data; }
size_t getSize() const { return HASH_BYTE_SIZE; }
size_t operator()() const;
bool operator==(const Hash &other) const;
std::string toString() const;
private:
char data[HASH_BYTE_SIZE];
};
struct HashHasher
{
size_t operator()(const Hash &hash) const
{
return hash();
}
};
template <typename ValueType>
using MapHash = std::unordered_map<Hash, ValueType, HashHasher>;
using SetHash = std::unordered_set<Hash, HashHasher>;
}
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