$ cat file
*start*of*junk*data*this is all junk data 01*end*of*junk*data*binary data binary data binary data
*start*of*junk*data*this is all junk data 02*end*of*junk*data*binary data binary data binary data
*start*of*junk*data*this is all junk data 03*end*of*junk*data*binary data binary data binary data
*start*of*junk*data*this is all junk data 04*end*of*junk*data*binary data binary data binary data