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#ifndef DataFormats_Provenance_CompactHash_h
#define DataFormats_Provenance_CompactHash_h
#include <string_view>
#include <array>
#include <functional>
namespace cms {
class Digest;
}
namespace edm {
namespace detail {
// This string is the 16-byte, non-printable version.
std::array<unsigned char, 16> const& InvalidCompactHash();
} // namespace detail
namespace compact_hash_detail {
using value_type = std::array<unsigned char, 16>;
void toString_(std::string& result, value_type const& hash);
void toDigest_(cms::Digest& digest, value_type const& hash);
std::ostream& print_(std::ostream& os, value_type const& hash);
bool isValid_(value_type const& hash);
size_t smallHash_(value_type const& hash);
value_type fromHex_(std::string_view);
void throwIfIllFormed(std::string_view v);
} // namespace compact_hash_detail
template <int I>
class CompactHash {
public:
typedef compact_hash_detail::value_type value_type;
CompactHash();
explicit CompactHash(value_type const& v);
explicit CompactHash(std::string_view v);
CompactHash(CompactHash<I> const&) = default;
CompactHash<I>& operator=(CompactHash<I> const& iRHS) = default;
CompactHash(CompactHash<I>&&) = default;
CompactHash<I>& operator=(CompactHash<I>&&) = default;
void reset();
// For now, just check the most basic: a default constructed
// ParameterSetID is not valid. This is very crude: we are
// assuming that nobody created a ParameterSetID from an empty
// string, nor from any string that is not a valid string
// representation of an MD5 checksum.
bool isValid() const;
bool operator<(CompactHash<I> const& other) const;
bool operator>(CompactHash<I> const& other) const;
bool operator==(CompactHash<I> const& other) const;
bool operator!=(CompactHash<I> const& other) const;
std::ostream& print(std::ostream& os) const;
void toString(std::string& result) const;
void toDigest(cms::Digest& digest) const;
// Return the 16-byte (non-printable) string form.
value_type const& compactForm() const;
///returns a short hash which can be used with hashing containers
size_t smallHash() const;
//Used by ROOT storage
// CMS_CLASS_VERSION(3) // This macro is not defined here, so expand it.
static short Class_Version() { return 3; }
private:
template <typename Op>
bool compareUsing(CompactHash<I> const& iOther, Op op) const {
return op(this->hash_, iOther.hash_);
}
value_type hash_;
};
//--------------------------------------------------------------------
//
// Implementation details follow...
//--------------------------------------------------------------------
template <int I>
inline CompactHash<I>::CompactHash() : hash_(detail::InvalidCompactHash()) {}
template <int I>
inline CompactHash<I>::CompactHash(value_type const& v) : hash_(v) {}
template <int I>
inline CompactHash<I>::CompactHash(std::string_view v) {
if (v.size() == 32) {
hash_ = compact_hash_detail::fromHex_(v);
} else {
compact_hash_detail::throwIfIllFormed(v);
std::copy(v.begin(), v.end(), hash_.begin());
}
}
template <int I>
inline void CompactHash<I>::reset() {
hash_ = detail::InvalidCompactHash();
}
template <int I>
inline bool CompactHash<I>::isValid() const {
return compact_hash_detail::isValid_(hash_);
}
template <int I>
inline bool CompactHash<I>::operator<(CompactHash<I> const& other) const {
return this->compareUsing(other, std::less<value_type>());
}
template <int I>
inline bool CompactHash<I>::operator>(CompactHash<I> const& other) const {
return this->compareUsing(other, std::greater<value_type>());
}
template <int I>
inline bool CompactHash<I>::operator==(CompactHash<I> const& other) const {
return this->compareUsing(other, std::equal_to<value_type>());
}
template <int I>
inline bool CompactHash<I>::operator!=(CompactHash<I> const& other) const {
return this->compareUsing(other, std::not_equal_to<value_type>());
}
template <int I>
inline std::ostream& CompactHash<I>::print(std::ostream& os) const {
return compact_hash_detail::print_(os, hash_);
}
template <int I>
inline void CompactHash<I>::toString(std::string& result) const {
compact_hash_detail::toString_(result, hash_);
}
template <int I>
inline void CompactHash<I>::toDigest(cms::Digest& digest) const {
compact_hash_detail::toDigest_(digest, hash_);
}
template <int I>
inline typename CompactHash<I>::value_type const& CompactHash<I>::compactForm() const {
return hash_;
}
template <int I>
inline size_t CompactHash<I>::smallHash() const {
return compact_hash_detail::smallHash_(hash_);
}
template <int I>
inline std::ostream& operator<<(std::ostream& os, CompactHash<I> const& h) {
return h.print(os);
}
} // namespace edm
#endif
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