/*
 * call-seq:
 *     load( source [, proc] ) => obj
 *     restore( source [, proc] ) => obj
 * 
 * Returns the result of converting the serialized data in source into a
 * Ruby object (possibly with associated subordinate objects). source
 * may be either an instance of IO or an object that responds to
 * to_str. If proc is specified, it will be passed each object as it
 * is deserialized.
 */
static VALUE
marshal_load(argc, argv)
    int argc;
    VALUE *argv;
{
    VALUE port, proc;
    int major, minor;
    VALUE v;
    struct load_arg arg;

    rb_scan_args(argc, argv, "11", &port, &proc);
    if (rb_respond_to(port, rb_intern("to_str"))) {
        arg.taint = OBJ_TAINTED(port); /* original taintedness */
        StringValue(port);            /* possible conversion */
    }
    else if (rb_respond_to(port, s_getc) && rb_respond_to(port, s_read)) {
        if (rb_respond_to(port, s_binmode)) {
            rb_funcall2(port, s_binmode, 0, 0);
        }
        arg.taint = Qtrue;
    }
    else {
        rb_raise(rb_eTypeError, "instance of IO needed");
    }
    arg.src = port;
    arg.offset = 0;

    major = r_byte(&arg);
    minor = r_byte(&arg);
    if (major != MARSHAL_MAJOR || minor > MARSHAL_MINOR) {
        rb_raise(rb_eTypeError, "incompatible marshal file format (can't be read)\n\
\tformat version %d.%d required; %d.%d given",
                 MARSHAL_MAJOR, MARSHAL_MINOR, major, minor);
    }
    if (RTEST(ruby_verbose) && minor != MARSHAL_MINOR) {
        rb_warn("incompatible marshal file format (can be read)\n\
\tformat version %d.%d required; %d.%d given",
                MARSHAL_MAJOR, MARSHAL_MINOR, major, minor);
    }

    arg.symbols = st_init_numtable();
    arg.data   = rb_hash_new();
    if (NIL_P(proc)) arg.proc = 0;
    else             arg.proc = proc;
    v = rb_ensure(load, (VALUE)&arg, load_ensure, (VALUE)&arg);

    return v;
}