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// license:BSD-3-Clause
// copyright-holders:Aaron Giles, Vas Crabb
/***************************************************************************
hashing.h
Hashing helper classes.
***************************************************************************/
#ifndef MAME_UTIL_HASHING_H
#define MAME_UTIL_HASHING_H
#pragma once
#include "osdcore.h"
#include "corestr.h"
#include "md5.h"
#include <array>
#include <functional>
#include <string>
namespace util {
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// ======================> SHA-1
// final digest
struct sha1_t
{
bool operator==(const sha1_t &rhs) const { return memcmp(m_raw, rhs.m_raw, sizeof(m_raw)) == 0; }
bool operator!=(const sha1_t &rhs) const { return memcmp(m_raw, rhs.m_raw, sizeof(m_raw)) != 0; }
operator uint8_t *() { return m_raw; }
bool from_string(const char *string, int length = -1);
std::string as_string() const;
uint8_t m_raw[20];
static const sha1_t null;
};
// creation helper
class sha1_creator
{
public:
// construction/destruction
sha1_creator() { reset(); }
// reset
void reset();
// append data
void append(const void *data, uint32_t length);
// finalize and compute the final digest
sha1_t finish();
// static wrapper to just get the digest from a block
static sha1_t simple(const void *data, uint32_t length)
{
sha1_creator creator;
creator.append(data, length);
return creator.finish();
}
protected:
uint64_t m_cnt;
std::array<uint32_t, 5> m_st;
uint32_t m_buf[16];
};
// ======================> MD5
// final digest
struct md5_t
{
bool operator==(const md5_t &rhs) const { return memcmp(m_raw, rhs.m_raw, sizeof(m_raw)) == 0; }
bool operator!=(const md5_t &rhs) const { return memcmp(m_raw, rhs.m_raw, sizeof(m_raw)) != 0; }
operator uint8_t *() { return m_raw; }
bool from_string(const char *string, int length = -1);
std::string as_string() const;
uint8_t m_raw[16];
static const md5_t null;
};
// creation helper
class md5_creator
{
public:
// construction/destruction
md5_creator() { reset(); }
// reset
void reset() { MD5Init(&m_context); }
// append data
void append(const void *data, uint32_t length) { MD5Update(&m_context, reinterpret_cast<const unsigned char *>(data), length); }
// finalize and compute the final digest
md5_t finish()
{
md5_t result;
MD5Final(result.m_raw, &m_context);
return result;
}
// static wrapper to just get the digest from a block
static md5_t simple(const void *data, uint32_t length)
{
md5_creator creator;
creator.append(data, length);
return creator.finish();
}
protected:
// internal state
struct MD5Context m_context; // internal context
};
// ======================> CRC-32
// final digest
struct crc32_t
{
crc32_t() { }
constexpr crc32_t(const crc32_t &rhs) = default;
constexpr crc32_t(const uint32_t crc) : m_raw(crc) { }
constexpr bool operator==(const crc32_t &rhs) const { return m_raw == rhs.m_raw; }
constexpr bool operator!=(const crc32_t &rhs) const { return m_raw != rhs.m_raw; }
crc32_t &operator=(const crc32_t &rhs) = default;
crc32_t &operator=(const uint32_t crc) { m_raw = crc; return *this; }
constexpr operator uint32_t() const { return m_raw; }
bool from_string(const char *string, int length = -1);
std::string as_string() const;
uint32_t m_raw;
static const crc32_t null;
};
// creation helper
class crc32_creator
{
public:
// construction/destruction
crc32_creator() { reset(); }
// reset
void reset() { m_accum.m_raw = 0; }
// append data
void append(const void *data, uint32_t length);
// finalize and compute the final digest
crc32_t finish() { return m_accum; }
// static wrapper to just get the digest from a block
static crc32_t simple(const void *data, uint32_t length)
{
crc32_creator creator;
creator.append(data, length);
return creator.finish();
}
protected:
// internal state
crc32_t m_accum; // internal accumulator
};
// ======================> CRC-16
// final digest
struct crc16_t
{
crc16_t() { }
constexpr crc16_t(const crc16_t &rhs) = default;
constexpr crc16_t(const uint16_t crc) : m_raw(crc) { }
constexpr bool operator==(const crc16_t &rhs) const { return m_raw == rhs.m_raw; }
constexpr bool operator!=(const crc16_t &rhs) const { return m_raw != rhs.m_raw; }
crc16_t &operator=(const crc16_t &rhs) = default;
crc16_t &operator=(const uint16_t crc) { m_raw = crc; return *this; }
constexpr operator uint16_t() const { return m_raw; }
bool from_string(const char *string, int length = -1);
std::string as_string() const;
uint16_t m_raw;
static const crc16_t null;
};
// creation helper
class crc16_creator
{
public:
// construction/destruction
crc16_creator() { reset(); }
// reset
void reset() { m_accum.m_raw = 0xffff; }
// append data
void append(const void *data, uint32_t length);
// finalize and compute the final digest
crc16_t finish() { return m_accum; }
// static wrapper to just get the digest from a block
static crc16_t simple(const void *data, uint32_t length)
{
crc16_creator creator;
creator.append(data, length);
return creator.finish();
}
protected:
// internal state
crc16_t m_accum; // internal accumulator
};
} // namespace util
namespace std {
template <> struct hash<::util::crc32_t>
{
typedef ::util::crc32_t argument_type;
typedef std::size_t result_type;
result_type operator()(argument_type const & s) const { return std::hash<std::uint32_t>()(s); }
};
template <> struct hash<::util::crc16_t>
{
typedef ::util::crc16_t argument_type;
typedef std::size_t result_type;
result_type operator()(argument_type const & s) const { return std::hash<std::uint16_t>()(s); }
};
} // namespace std
#endif // MAME_UTIL_HASHING_H
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