Create large file with random content.

CreatePayload.groovy

def random = new Random()

def sizeInMB = 10
def size = 1024 * 1024 * sizeInMB

def chars = ['a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z',
             '1','2','3','4','5','6','7','8','9','0',
             'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z',
             '!','"','§','$','%','&','/','(',')','=','?','`',';',':','_','\'','*','"','~','\\','[',']','{','}','|'
             ,'<','>',';',':','-','\n']

def fileName = "C:\\temp\\payload-0.txt"

def file = new File(fileName)

if (file.exists()){
    file.delete()
    file.createNewFile()
}

new FileOutputStream(fileName).withWriter("UTF-8") { writer ->

    println("STARTING")

    while(file.length() < size) {

        line=""

        (0..1023).each{
            line+=chars.get(random.nextInt(chars.size()))
        }

        writer << line
        writer.flush()

        print "\r\r\rSize: " + Math.round(file.length()/1024) + "kB"
    }
}
println "\rFile size = " + Math.round(file.length()/1024) + "kB"