bin2jpg

gistfile1.groovy

import groovy.io.FileType

targetDirectory = System.getProperty("user.dir")
println("Working directory: "+targetDirectory)
targetDirectory = "d:/test"

def param
if(args.size() != 0)
    param = args[0]
else
    param = ""
if(param == "criple"){
    println("Cripling only...")
}

def workDir = new File(targetDirectory)
workDir.traverse(
    type:FileType.FILES,
    nameFilter:~/.*\.jpg/
){ 
    print(it)
//    def file = new File(it)
    def fn = it.getBytes()
    if(fn[0]==(Byte)0xFF && fn[1]==(Byte)0xD8){
        println(" File has JPEG header")
        if(param=="criple"){
            fn[0]=(Byte)0x30
            fn[1]=(Byte)0x30
            it.setBytes(fn)
        }
    } else if(fn[0]==(Byte)0x30 && fn[1]==(Byte)0x30){
        println(" File has cripled header, restoring")
        fn[0]=(Byte)0xFF
        fn[1]=(Byte)0xD8
        it.setBytes(fn)
    } else {
        println(" Undefined")
    }
};