square.cpp

超强国际象棋引擎

// square.cpp

// includes

#include "square.h"

// "constants"

const int square_from_64[64] =
    {
    (0x44), (0x45), (0x46), (0x47), (0x48), (0x49), (0x4A), (0x4B), (0x54), (0x55), (0x56), (0x57), (0x58), (0x59),
        (0x5A), (0x5B), (0x64), (0x65), (0x66), (0x67), (0x68), (0x69), (0x6A), (0x6B), (0x74), (0x75), (0x76), (0x77),
        (0x78), (0x79), (0x7A), (0x7B), (0x84), (0x85), (0x86), (0x87), (0x88), (0x89), (0x8A), (0x8B), (0x94), (0x95),
        (0x96), (0x97), (0x98), (0x99), (0x9A), (0x9B), (0xA4), (0xA5), (0xA6), (0xA7), (0xA8), (0xA9), (0xAA), (0xAB),
        (0xB4), (0xB5), (0xB6), (0xB7), (0xB8), (0xB9), (0xBA), (0xBB),
    };

const int rank_mask[2] =
    {
    0, 0xF
    };

const int promote_rank[2] =
    {
    0xB0, 0x40
    };

// variables

int square_to_64[256];
bool square_is_promote[256];

// functions

// square_init()

void square_init()
    {

    int sq;

    // square_to_64[]

    for ( sq = 0; sq < 256; sq++ )
        square_to_64[sq] = -1;

    for ( sq = 0; sq < 64; sq++ )
        {
        square_to_64[square_from_64[sq]] = sq;
        }

    // square_is_promote[]

    for ( sq = 0; sq < 256; sq++ )
        {
        square_is_promote[sq] = SQUARE_IS_OK(sq) && (SQUARE_RANK(sq) == (0x4) || SQUARE_RANK(sq) == (0xB));
        }
    }

// file_from_char()

int file_from_char(int c)
    {
    return (0x4) + (c - 'a');
    }

// rank_from_char()

int rank_from_char(int c)
    {
    return (0x4) + (c - '1');
    }

// file_to_char()

int file_to_char(int file)
    {
    return 'a' + (file - (0x4));
    }

// rank_to_char()

int rank_to_char(int rank)
    {
    return '1' + (rank - (0x4));
    }

// square_to_string()

bool square_to_string(int square, char string [], int size)
    {
    if(size < 3)
        return false;

    string[0] = file_to_char(SQUARE_FILE(square));
    string[1] = rank_to_char(SQUARE_RANK(square));
    string[2] = '\0';

    return true;
    }

// square_from_string()

int square_from_string(const char string [])
    {

    int file, rank;

    if(string[0] < 'a' || string[0] > 'h')
        return 0;

    if(string[1] < '1' || string[1] > '8')
        return 0;

    if(string[2] != '\0')
        return 0;

    file = file_from_char(string[0]);
    rank = rank_from_char(string[1]);

    return SQUARE_MAKE(file, rank);
    }

// end of square.cpp