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[WIP] Use PyUnicode_Export() and PyUnicode_Import() #451

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[WIP] Use PyUnicode_Export() and PyUnicode_Import() #451

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116 changes: 68 additions & 48 deletions src/markupsafe/_speedups.c
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Original file line number Diff line number Diff line change
Expand Up @@ -72,102 +72,122 @@
}

static PyObject*
escape_unicode_kind1(PyUnicodeObject *in)
escape_unicode_kind1(PyObject *in, const void *data, Py_ssize_t size)
{
Py_UCS1 *inp = PyUnicode_1BYTE_DATA(in);
Py_UCS1 *inp_end = inp + PyUnicode_GET_LENGTH(in);
Py_UCS1 *outp;
Py_UCS1 *inp = (Py_UCS1*)data;
Py_UCS1 *inp_end = inp + size;
Py_UCS1 *outbuf, *outp;
PyObject *out;
Py_ssize_t delta = 0;

GET_DELTA(inp, inp_end, delta);
if (!delta) {
Py_INCREF(in);
return (PyObject*)in;
return Py_NewRef(in);
}

out = PyUnicode_New(PyUnicode_GET_LENGTH(in) + delta,
PyUnicode_IS_ASCII(in) ? 127 : 255);
if (!out)
outbuf = PyMem_Malloc((size + delta) * sizeof(Py_UCS1));
if (outbuf == NULL) {
return NULL;

inp = PyUnicode_1BYTE_DATA(in);
outp = PyUnicode_1BYTE_DATA(out);
}
inp = (Py_UCS1*)data;
outp = outbuf;
DO_ESCAPE(inp, inp_end, outp);

out = PyUnicode_Import(outbuf, (size + delta) * sizeof(Py_UCS1),
PyUnicode_FORMAT_UCS1);
PyMem_Free(outbuf);
return out;
}

static PyObject*
escape_unicode_kind2(PyUnicodeObject *in)
escape_unicode_kind2(PyObject *in, const void *data, Py_ssize_t size)
{
Py_UCS2 *inp = PyUnicode_2BYTE_DATA(in);
Py_UCS2 *inp_end = inp + PyUnicode_GET_LENGTH(in);
Py_UCS2 *outp;
Py_UCS2 *inp = (Py_UCS2*)data;
Py_UCS2 *inp_end = inp + size;
Py_UCS2 *outbuf, *outp;
PyObject *out;
Py_ssize_t delta = 0;

GET_DELTA(inp, inp_end, delta);
if (!delta) {
Py_INCREF(in);
return (PyObject*)in;
return Py_NewRef(in);
}

out = PyUnicode_New(PyUnicode_GET_LENGTH(in) + delta, 65535);
if (!out)
outbuf = PyMem_Malloc((size + delta) * sizeof(Py_UCS2));
if (outbuf == NULL) {
return NULL;

inp = PyUnicode_2BYTE_DATA(in);
outp = PyUnicode_2BYTE_DATA(out);
}
inp = (Py_UCS2*)data;
outp = outbuf;
DO_ESCAPE(inp, inp_end, outp);

out = PyUnicode_Import(outbuf, (size + delta) * sizeof(Py_UCS2),
PyUnicode_FORMAT_UCS2);
PyMem_Free(outbuf);
return out;
}


static PyObject*
escape_unicode_kind4(PyUnicodeObject *in)
escape_unicode_kind4(PyObject *in, const void *data, Py_ssize_t size)
{
Py_UCS4 *inp = PyUnicode_4BYTE_DATA(in);
Py_UCS4 *inp_end = inp + PyUnicode_GET_LENGTH(in);
Py_UCS4 *outp;
Py_UCS4 *inp = (Py_UCS4*)data;
Py_UCS4 *inp_end = inp + size;
Py_UCS4 *outbuf, *outp;
PyObject *out;
Py_ssize_t delta = 0;

GET_DELTA(inp, inp_end, delta);
if (!delta) {
Py_INCREF(in);
return (PyObject*)in;
return Py_NewRef(in);
}

out = PyUnicode_New(PyUnicode_GET_LENGTH(in) + delta, 1114111);
if (!out)
outbuf = PyMem_Malloc((size + delta) * sizeof(Py_UCS4));
if (outbuf == NULL) {
return NULL;

inp = PyUnicode_4BYTE_DATA(in);
outp = PyUnicode_4BYTE_DATA(out);
}
inp = (Py_UCS4*)data;
outp = outbuf;
DO_ESCAPE(inp, inp_end, outp);

out = PyUnicode_Import(outbuf, (size + delta) * sizeof(Py_UCS4),
PyUnicode_FORMAT_UCS4);
PyMem_Free(outbuf);
return out;
}

static PyObject*
escape_unicode(PyObject *self, PyObject *s)
{
if (!PyUnicode_CheckExact(s))
return NULL;

// This check is no longer needed in Python 3.12.
if (PyUnicode_READY(s))
uint32_t formats = (PyUnicode_FORMAT_ASCII
| PyUnicode_FORMAT_UCS1
| PyUnicode_FORMAT_UCS2
| PyUnicode_FORMAT_UCS4);
uint32_t format;
Py_ssize_t size;
const void *data = PyUnicode_Export(s, formats, &size, &format);
if (data == NULL) {
return NULL;
}

switch (PyUnicode_KIND(s)) {
case PyUnicode_1BYTE_KIND:
return escape_unicode_kind1(s);
case PyUnicode_2BYTE_KIND:
return escape_unicode_kind2(s);
case PyUnicode_4BYTE_KIND:
return escape_unicode_kind4(s);
PyObject *res;
switch (format) {
case PyUnicode_FORMAT_ASCII:
case PyUnicode_FORMAT_UCS1:
res = escape_unicode_kind1(s, data, size);
break;
case PyUnicode_FORMAT_UCS2:
res = escape_unicode_kind2(s, data, size / 2);
break;
case PyUnicode_FORMAT_UCS4:
res = escape_unicode_kind4(s, data, size / 4);
break;
default:
assert(0); /* shouldn't happen */
res = NULL;
}
assert(0); /* shouldn't happen */
return NULL;
PyUnicode_ReleaseExport(s, data, format);
return res;
}

static PyMethodDef module_methods[] = {
Expand Down