/**
* Read into the given PyObject that implements the Jython buffer API (with write access) or is a
* PyArray.
*
* @param buf a PyObject compatible with the buffer API
* @return the amount of data read as an int
*/
public int readinto(PyObject buf) {
// This is an inefficient version of readinto: but readinto is
// not recommended for use in Python 2.x anyway
if (buf instanceof PyArray) {
// PyArray has the buffer interface but it only works for bytes at present
PyArray array = (PyArray) buf;
String read = read(array.__len__());
for (int i = 0; i < read.length(); i++) {
array.set(i, new PyString(read.charAt(i)));
}
return read.length();
} else if (buf instanceof BufferProtocol) {
try (PyBuffer view = ((BufferProtocol) buf).getBuffer(PyBUF.FULL_RO)) {
if (view.isReadonly()) {
// More helpful than falling through to CPython message
throw Py.TypeError("cannot read into read-only " + buf.getType().fastGetName());
} else {
// Inefficiently, we have to go via a String
String read = read(view.getLen());
int n = read.length();
for (int i = 0; i < n; i++) {
view.storeAt((byte) read.charAt(i), i);
}
return read.length();
}
}
}
// No valid alternative worked
throw Py.TypeError("argument 1 must be read-write buffer, not " + buf.getType().fastGetName());
}
public static PyTuple unpack(String format, PyArray buffer) {
String string = buffer.tostring();
FormatDef[] f = whichtable(format);
int size = calcsize(format, f);
int len = string.length();
if (size != len) throw StructError("unpack str size does not match format");
return unpack(f, size, format, new ByteStream(string));
}
static void pack_into(String format, FormatDef[] f, int size, int argstart, PyObject[] args) {
if (args.length - argstart < 2) Py.TypeError("illegal argument type for built-in operation");
if (!(args[argstart] instanceof PyArray)) {
throw Py.TypeError("pack_into takes an array arg"); // as well as a buffer, what else?
}
PyArray buffer = (PyArray) args[argstart];
int offset = args[argstart + 1].asInt();
ByteStream res = pack(format, f, size, argstart + 2, args);
if (res.pos > buffer.__len__()) {
throw StructError(
"pack_into requires a buffer of at least " + res.pos + " bytes, got " + buffer.__len__());
}
for (int i = 0; i < res.pos; i++, offset++) {
char val = res.data[i];
buffer.set(offset, val);
}
}