cos/index.js

/**
 *  Get one bit on a byte
 * 
 *  This is a byte of bits ===> ABCDEFGH
 * 
 *  getBIT(ABCDEFGH, 3) ==> E
 */
function getBIT(byte, order)
{
    return (byte >> order) & 1
}
/**
 *  Update one bit on a byte
 * 
 *  This is a byte of bits ===> ABCDEFGH
 * 
 *  setBIT(ABCDEFGH, 3, 0) ==> ABCD0FGH
 *  setBIT(ABCDEFGH, 3, 1) ==> ABCD1FGH
 */
function setBIT(byte, order, value)
{
    return (
        value == 0
    ) ? (
        byte & (( 1 << order ) ^ 255)
    ) : (
        byte | ( 1 << order )
    );
};
/**
 *  Explode byte of per bits and given Function
 *  and anonymous returning value is result
 * 
 *  This is a byte of bits ===> ABCDEFGH
 * 
 *  explodeBits(ABCDEFGH, (A, B, C, D, E, F, G, H) => {
 *      return A
 *  }) ===> A
 * 
 */
function explodeBits(bytes, map)
{
    return map(
        (bytes >> 7 & 1),
        (bytes >> 6 & 1),
        (bytes >> 5 & 1),
        (bytes >> 4 & 1),
        (bytes >> 3 & 1),
        (bytes >> 2 & 1),
        (bytes >> 1 & 1),
        bytes & 1
    )
}
/**
 *  Explode byte of per bits and given Function
 *  and anonymous returning value is result
 * 
 *  This is a byte of bits ===> ABCDEFGH
 * 
 *  implodeByte(A,B,C,D,E,F,G,H) ===> ABCDEFGH
 */
function implodeByte(a,b,c,d,e,f,g,h)
{
    return (a << 7) | (b << 6) | (c << 5) | (d << 4) | (e << 3) | (f << 2) | (g << 1) | h
}
/**
 *  Explode byte of per bits and given Function
 *  and anonymous returning value is result
 * 
 *  This is a byte of bits ===> ABCDEFGH
 * 
 *  explodeBits(ABCDEFGH, (A0000000, 0B000000, 00C00000, 000D0000, 0000E000, 00000F00, 000000G0, 0000000H) => {
 *      return A
 *  }) ===> A
 * 
 */
function explodeBitValue(bytes, map)
{
    return map(
        (bytes >> 7 & 1) << 7,
        (bytes >> 6 & 1) << 6,
        (bytes >> 5 & 1) << 5,
        (bytes >> 4 & 1) << 4,
        (bytes >> 3 & 1) << 3,
        (bytes >> 2 & 1) << 2,
        (bytes >> 1 & 1) << 1,
        bytes & 1
    )
}
/**
 *  Explode byte of per bits and given Function
 *  and anonymous returning value is result
 * 
 *  This is a byte of bits ===> ABCDEFGH
 * 
 *  implodeByte(A0000000, 0B000000, 00C00000, 000D0000, 0000E000, 00000F00, 000000G0, 0000000H) ===> ABCDEFGH
 */
function implodeBitValues(a,b,c,d,e,f,g,h)
{
    return a | b | c | d | e | f | g | h
}
/**
 *  This is a byte of bits ===> ABCDEFGH
 * 
 *  rightShift(ABCDEFGH) ==> HABCDEFG
 */
function rightShift(byte)
{
    return explodeBits(byte, (a,b,c,d,e,f,g,h) => {
        return implodeByte(h,a,b,c,d,e,f,g)
    })
}
/**
 *  This is a byte of bits ===> ABCDEFGH
 * 
 *  leftShift(ABCDEFGH) ==> BCDEFGHA
 */
function leftShift(byte)
{
    return explodeBits(byte, (a,b,c,d,e,f,g,h) => {
        return implodeByte(b,c,d,e,f,g,h,a)
    })
}
/**
 * eachBlock([A,B,C,D,E,F,G,H], 3) ==> [A,B,C],[D,E,F],[G,H]
 */
function * eachBlock(bytesArray, size)
{
    let current = 0;
    while(1)
    {
        let currentOffset = current * size;
        let currentOffsetEnd = current * size + size;
        let result = bytesArray.slice(
            currentOffset,
            currentOffsetEnd
        );
        if(result.length + size <= size)
        {
            return result
        }else{
            current++;
            yield result
        }
    }
}