lib_crc.h

//------------------------------------------------------------------------
//  CRC : Cyclic Rendundancy Check
//------------------------------------------------------------------------
//
//  OBSIDIAN Level Maker
//
//  Copyright (C) 2021-2022 The OBSIDIAN Team
//  Copyright (C) 2006-2017 Andrew Apted
//
//  This program is free software; you can redistribute it and/or
//  modify it under the terms of the GNU General Public License
//  as published by the Free Software Foundation; either version 2
//  of the License, or (at your option) any later version.
//
//  This program is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.
//
//------------------------------------------------------------------------
//
//  This is the Adler-32 algorithm as described in RFC-1950.
//
//------------------------------------------------------------------------

#ifndef __LIB_CRC_H__
#define __LIB_CRC_H__

#include "sys_type.h"

class crc32_c {
   public:
    u32_t raw;

   private:
    static const u32_t INIT_VALUE = 1;

   public:
    crc32_c() : raw(INIT_VALUE) {}
    crc32_c(const crc32_c &rhs) { raw = rhs.raw; }
    ~crc32_c() {}

    crc32_c &operator=(const crc32_c &rhs);

    crc32_c &operator+=(u8_t value);
    crc32_c &operator+=(s8_t value);
    crc32_c &operator+=(u16_t value);
    crc32_c &operator+=(s16_t value);
    crc32_c &operator+=(u32_t value);
    crc32_c &operator+=(s32_t value);
    crc32_c &operator+=(float value);
    crc32_c &operator+=(bool value);

    crc32_c &AddBlock(const u8_t *data, int len);
    crc32_c &AddCStr(const char *str);

    void Reset(void) { raw = INIT_VALUE; }
};

//------------------------------------------------------------------------
// IMPLEMENTATION
//------------------------------------------------------------------------

inline crc32_c &crc32_c::operator=(const crc32_c &rhs) {
    raw = rhs.raw;
    return *this;
}

inline crc32_c &crc32_c::operator+=(s8_t value) {
    *this += (u8_t)value;
    return *this;
}
inline crc32_c &crc32_c::operator+=(s16_t value) {
    *this += (u16_t)value;
    return *this;
}
inline crc32_c &crc32_c::operator+=(s32_t value) {
    *this += (u32_t)value;
    return *this;
}
inline crc32_c &crc32_c::operator+=(bool value) {
    *this += (value ? (u8_t)1 : (u8_t)0);
    return *this;
}

#endif  // __LIB_CRC_H__

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