module buffer.utils;

import std.conv;
import std.string;
import std.digest.md;
import std.array;

string MD5(scope const(void[])[] src...)
{
    auto md5 = new MD5Digest();
    ubyte[] hash = md5.digest(src);

    return toHexString(hash).toUpper();
}

ubyte[] strToByte_hex(const string input)
{
    Appender!(ubyte[]) app;

    for (int i; i < input.length; i += 2)
    {
        app.put(input[i .. i + 2].to!ubyte(16));
    }

    return app.data;
}

string byteToStr_hex(T = byte)(const T[] buffer)
{
    Appender!string app;

    foreach (b; buffer)
    {
        app.put(rightJustify(b.to!string(16).toUpper(), 2, '0'));
    }
    return app.data;
}

string getClassSimpleName(const string input)
{
    int pos = cast(int)lastIndexOf(input, '.');

    return input[pos < 0 ? 0 : pos + 1 .. $];
}

ubyte[] realToUBytes(scope const real value)
{
    ubyte[] buf = new ubyte[real.sizeof];
    ubyte* p = cast(ubyte*)&value;
    int i = real.sizeof;

    while (i-- > 0)
    {
        buf[real.sizeof - i - 1] = p[i];
    }

    return buf;
}

real ubytesToReal(scope const ubyte[] value)
{
    real r;
    ubyte* p = cast(ubyte*)&r;
    
    for (int i = 0; i < value.length; i++)
    {
        p[value.length - i - 1] = value[i];
    }
    
    return r;
}