Counterparty Asset Name to Asset ID

xcp_assetname.js

function assetname(assetid) {

    if(assetid != 1){
    
        var b26_digits = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'; 
        var letter_array = b26_digits.split("");
        var asset_name = "";
        var div;
        var rem;
        
        while (assetid > 0) { 
            
            div = Math.floor(assetid/26);
            rem = assetid % 26;
            
            assetid = div;
            
            asset_name = asset_name + letter_array[rem];
            
        }    
        
        var final_name = asset_name.split("").reverse().join("");
    
    } else {
        
        var final_name = "XCP";
        
    }
    
    return final_name;
    
}

Python 3

def asset_name(assetid):
    if assetid == 1:
        return 'XCP'
    name = ''
    while assetid > 0:
        name += 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'[assetid % 26]
        assetid //= 26
    return name[::-1]