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381 lines (312 loc) · 8.65 KB
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// Use pycore_bytes.h
#define PYTESTCAPI_NEED_INTERNAL_API
#include "parts.h"
#include "util.h"
#include "pycore_bytesobject.h" // _PyBytesWriter_CreateByteArray()
/* Test _PyBytes_Resize() */
static PyObject *
bytes_resize(PyObject *Py_UNUSED(module), PyObject *args)
{
PyObject *obj;
Py_ssize_t newsize;
int new;
if (!PyArg_ParseTuple(args, "Onp", &obj, &newsize, &new))
return NULL;
NULLABLE(obj);
if (new) {
assert(obj != NULL);
assert(PyBytes_CheckExact(obj));
PyObject *newobj = PyBytes_FromStringAndSize(NULL, PyBytes_Size(obj));
if (newobj == NULL) {
return NULL;
}
memcpy(PyBytes_AsString(newobj), PyBytes_AsString(obj), PyBytes_Size(obj));
obj = newobj;
}
else {
Py_XINCREF(obj);
}
if (_PyBytes_Resize(&obj, newsize) < 0) {
assert(obj == NULL);
}
else {
assert(obj != NULL);
}
return obj;
}
/* Test PyBytes_Join() */
static PyObject *
bytes_join(PyObject *Py_UNUSED(module), PyObject *args)
{
PyObject *sep, *iterable;
if (!PyArg_ParseTuple(args, "OO", &sep, &iterable)) {
return NULL;
}
NULLABLE(sep);
NULLABLE(iterable);
return PyBytes_Join(sep, iterable);
}
// --- PyBytesWriter type ---------------------------------------------------
typedef struct {
PyObject_HEAD
PyBytesWriter *writer;
} WriterObject;
static PyObject *
writer_new(PyTypeObject *type, PyObject *args, PyObject *kwargs)
{
WriterObject *self = (WriterObject *)type->tp_alloc(type, 0);
if (!self) {
return NULL;
}
self->writer = NULL;
return (PyObject*)self;
}
static int
writer_init(PyObject *self_raw, PyObject *args, PyObject *kwargs)
{
if (kwargs && PyDict_GET_SIZE(kwargs)) {
PyErr_Format(PyExc_TypeError,
"PyBytesWriter() takes exactly no keyword arguments");
return -1;
}
Py_ssize_t alloc;
char *str;
Py_ssize_t str_size;
int use_bytearray;
if (!PyArg_ParseTuple(args, "ny#i",
&alloc, &str, &str_size, &use_bytearray)) {
return -1;
}
WriterObject *self = (WriterObject *)self_raw;
if (self->writer) {
PyBytesWriter_Discard(self->writer);
}
if (use_bytearray) {
self->writer = _PyBytesWriter_CreateByteArray(alloc);
}
else {
self->writer = PyBytesWriter_Create(alloc);
}
if (self->writer == NULL) {
return -1;
}
if (str_size) {
char *buf = PyBytesWriter_GetData(self->writer);
memcpy(buf, str, str_size);
}
return 0;
}
static void
writer_dealloc(PyObject *self_raw)
{
WriterObject *self = (WriterObject *)self_raw;
PyTypeObject *tp = Py_TYPE(self);
if (self->writer) {
PyBytesWriter_Discard(self->writer);
}
tp->tp_free(self);
Py_DECREF(tp);
}
static inline int
writer_check(WriterObject *self)
{
if (self->writer == NULL) {
PyErr_SetString(PyExc_ValueError, "operation on finished writer");
return -1;
}
return 0;
}
static PyObject*
writer_write_bytes(PyObject *self_raw, PyObject *args)
{
WriterObject *self = (WriterObject *)self_raw;
if (writer_check(self) < 0) {
return NULL;
}
char *bytes;
Py_ssize_t size;
if (!PyArg_ParseTuple(args, "yn", &bytes, &size)) {
return NULL;
}
if (PyBytesWriter_WriteBytes(self->writer, bytes, size) < 0) {
return NULL;
}
Py_RETURN_NONE;
}
static PyObject*
writer_format_i(PyObject *self_raw, PyObject *args)
{
WriterObject *self = (WriterObject *)self_raw;
if (writer_check(self) < 0) {
return NULL;
}
char *format;
int value;
if (!PyArg_ParseTuple(args, "yi", &format, &value)) {
return NULL;
}
if (PyBytesWriter_Format(self->writer, format, value) < 0) {
return NULL;
}
Py_RETURN_NONE;
}
static PyObject*
writer_resize(PyObject *self_raw, PyObject *args)
{
WriterObject *self = (WriterObject *)self_raw;
if (writer_check(self) < 0) {
return NULL;
}
Py_ssize_t size;
char *str;
Py_ssize_t str_size;
if (!PyArg_ParseTuple(args,
"ny#",
&size, &str, &str_size)) {
return NULL;
}
assert(size >= str_size);
Py_ssize_t pos = PyBytesWriter_GetSize(self->writer);
if (PyBytesWriter_Resize(self->writer, size) < 0) {
return NULL;
}
char *buf = PyBytesWriter_GetData(self->writer);
memcpy(buf + pos, str, str_size);
Py_RETURN_NONE;
}
static PyObject*
writer_get_size(PyObject *self_raw, PyObject *Py_UNUSED(args))
{
WriterObject *self = (WriterObject *)self_raw;
if (writer_check(self) < 0) {
return NULL;
}
Py_ssize_t alloc = PyBytesWriter_GetSize(self->writer);
return PyLong_FromSsize_t(alloc);
}
static PyObject*
writer_finish(PyObject *self_raw, PyObject *Py_UNUSED(args))
{
WriterObject *self = (WriterObject *)self_raw;
if (writer_check(self) < 0) {
return NULL;
}
PyObject *str = PyBytesWriter_Finish(self->writer);
self->writer = NULL;
return str;
}
static PyObject*
writer_finish_with_size(PyObject *self_raw, PyObject *args)
{
WriterObject *self = (WriterObject *)self_raw;
if (writer_check(self) < 0) {
return NULL;
}
Py_ssize_t size;
if (!PyArg_ParseTuple(args, "n", &size)) {
return NULL;
}
PyObject *str = PyBytesWriter_FinishWithSize(self->writer, size);
self->writer = NULL;
return str;
}
static PyMethodDef writer_methods[] = {
{"write_bytes", _PyCFunction_CAST(writer_write_bytes), METH_VARARGS},
{"format_i", _PyCFunction_CAST(writer_format_i), METH_VARARGS},
{"resize", _PyCFunction_CAST(writer_resize), METH_VARARGS},
{"get_size", _PyCFunction_CAST(writer_get_size), METH_NOARGS},
{"finish", _PyCFunction_CAST(writer_finish), METH_NOARGS},
{"finish_with_size", _PyCFunction_CAST(writer_finish_with_size), METH_VARARGS},
{NULL, NULL} /* sentinel */
};
static PyType_Slot Writer_Type_slots[] = {
{Py_tp_new, writer_new},
{Py_tp_init, writer_init},
{Py_tp_dealloc, writer_dealloc},
{Py_tp_methods, writer_methods},
{0, 0}, /* sentinel */
};
static PyType_Spec Writer_spec = {
.name = "_testcapi.PyBytesWriter",
.basicsize = sizeof(WriterObject),
.flags = Py_TPFLAGS_DEFAULT,
.slots = Writer_Type_slots,
};
static PyObject *
byteswriter_abc(PyObject *Py_UNUSED(module), PyObject *Py_UNUSED(args))
{
PyBytesWriter *writer = PyBytesWriter_Create(3);
if (writer == NULL) {
return NULL;
}
char *str = PyBytesWriter_GetData(writer);
memcpy(str, "abc", 3);
return PyBytesWriter_Finish(writer);
}
static PyObject *
byteswriter_resize(PyObject *Py_UNUSED(module), PyObject *Py_UNUSED(args))
{
// Allocate 10 bytes
PyBytesWriter *writer = PyBytesWriter_Create(10);
if (writer == NULL) {
return NULL;
}
char *buf = PyBytesWriter_GetData(writer);
// Write some bytes
memcpy(buf, "Hello ", strlen("Hello "));
buf += strlen("Hello ");
// Allocate 10 more bytes
buf = PyBytesWriter_GrowAndUpdatePointer(writer, 10, buf);
if (buf == NULL) {
PyBytesWriter_Discard(writer);
return NULL;
}
// Write more bytes
memcpy(buf, "World", strlen("World"));
buf += strlen("World");
// Truncate to the exact size and create a bytes object
return PyBytesWriter_FinishWithPointer(writer, buf);
}
static PyObject *
byteswriter_highlevel(PyObject *Py_UNUSED(module), PyObject *Py_UNUSED(args))
{
PyBytesWriter *writer = PyBytesWriter_Create(0);
if (writer == NULL) {
goto error;
}
if (PyBytesWriter_WriteBytes(writer, "Hello", -1) < 0) {
goto error;
}
if (PyBytesWriter_Format(writer, " %s!", "World") < 0) {
goto error;
}
return PyBytesWriter_Finish(writer);
error:
PyBytesWriter_Discard(writer);
return NULL;
}
static PyMethodDef test_methods[] = {
{"bytes_resize", bytes_resize, METH_VARARGS},
{"bytes_join", bytes_join, METH_VARARGS},
{"byteswriter_abc", byteswriter_abc, METH_NOARGS},
{"byteswriter_resize", byteswriter_resize, METH_NOARGS},
{"byteswriter_highlevel", byteswriter_highlevel, METH_NOARGS},
{NULL},
};
int
_PyTestCapi_Init_Bytes(PyObject *m)
{
if (PyModule_AddFunctions(m, test_methods) < 0) {
return -1;
}
PyTypeObject *writer_type = (PyTypeObject *)PyType_FromSpec(&Writer_spec);
if (writer_type == NULL) {
return -1;
}
if (PyModule_AddType(m, writer_type) < 0) {
Py_DECREF(writer_type);
return -1;
}
Py_DECREF(writer_type);
return 0;
}