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#include <Python.h>
#define GET_DELTA(inp, inp_end, delta) \
while (inp < inp_end) { \
switch (*inp++) { \
case '"': \
case '\'': \
case '&': \
delta += 4; \
break; \
case '<': \
case '>': \
delta += 3; \
break; \
} \
}
#define DO_ESCAPE(inp, inp_end, outp) \
{ \
Py_ssize_t ncopy = 0; \
while (inp < inp_end) { \
switch (*inp) { \
case '"': \
memcpy(outp, inp-ncopy, sizeof(*outp)*ncopy); \
outp += ncopy; ncopy = 0; \
*outp++ = '&'; \
*outp++ = '#'; \
*outp++ = '3'; \
*outp++ = '4'; \
*outp++ = ';'; \
break; \
case '\'': \
memcpy(outp, inp-ncopy, sizeof(*outp)*ncopy); \
outp += ncopy; ncopy = 0; \
*outp++ = '&'; \
*outp++ = '#'; \
*outp++ = '3'; \
*outp++ = '9'; \
*outp++ = ';'; \
break; \
case '&': \
memcpy(outp, inp-ncopy, sizeof(*outp)*ncopy); \
outp += ncopy; ncopy = 0; \
*outp++ = '&'; \
*outp++ = 'a'; \
*outp++ = 'm'; \
*outp++ = 'p'; \
*outp++ = ';'; \
break; \
case '<': \
memcpy(outp, inp-ncopy, sizeof(*outp)*ncopy); \
outp += ncopy; ncopy = 0; \
*outp++ = '&'; \
*outp++ = 'l'; \
*outp++ = 't'; \
*outp++ = ';'; \
break; \
case '>': \
memcpy(outp, inp-ncopy, sizeof(*outp)*ncopy); \
outp += ncopy; ncopy = 0; \
*outp++ = '&'; \
*outp++ = 'g'; \
*outp++ = 't'; \
*outp++ = ';'; \
break; \
default: \
ncopy++; \
} \
inp++; \
} \
memcpy(outp, inp-ncopy, sizeof(*outp)*ncopy); \
}
static PyObject*
escape_unicode_kind1(PyUnicodeObject *in)
{
Py_UCS1 *inp = PyUnicode_1BYTE_DATA(in);
Py_UCS1 *inp_end = inp + PyUnicode_GET_LENGTH(in);
Py_UCS1 *outp;
PyObject *out;
Py_ssize_t delta = 0;
GET_DELTA(inp, inp_end, delta);
if (!delta) {
Py_INCREF(in);
return (PyObject*)in;
}
out = PyUnicode_New(PyUnicode_GET_LENGTH(in) + delta,
PyUnicode_IS_ASCII(in) ? 127 : 255);
if (!out)
return NULL;
inp = PyUnicode_1BYTE_DATA(in);
outp = PyUnicode_1BYTE_DATA(out);
DO_ESCAPE(inp, inp_end, outp);
return out;
}
static PyObject*
escape_unicode_kind2(PyUnicodeObject *in)
{
Py_UCS2 *inp = PyUnicode_2BYTE_DATA(in);
Py_UCS2 *inp_end = inp + PyUnicode_GET_LENGTH(in);
Py_UCS2 *outp;
PyObject *out;
Py_ssize_t delta = 0;
GET_DELTA(inp, inp_end, delta);
if (!delta) {
Py_INCREF(in);
return (PyObject*)in;
}
out = PyUnicode_New(PyUnicode_GET_LENGTH(in) + delta, 65535);
if (!out)
return NULL;
inp = PyUnicode_2BYTE_DATA(in);
outp = PyUnicode_2BYTE_DATA(out);
DO_ESCAPE(inp, inp_end, outp);
return out;
}
static PyObject*
escape_unicode_kind4(PyUnicodeObject *in)
{
Py_UCS4 *inp = PyUnicode_4BYTE_DATA(in);
Py_UCS4 *inp_end = inp + PyUnicode_GET_LENGTH(in);
Py_UCS4 *outp;
PyObject *out;
Py_ssize_t delta = 0;
GET_DELTA(inp, inp_end, delta);
if (!delta) {
Py_INCREF(in);
return (PyObject*)in;
}
out = PyUnicode_New(PyUnicode_GET_LENGTH(in) + delta, 1114111);
if (!out)
return NULL;
inp = PyUnicode_4BYTE_DATA(in);
outp = PyUnicode_4BYTE_DATA(out);
DO_ESCAPE(inp, inp_end, outp);
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))
return NULL;
switch (PyUnicode_KIND(s)) {
case PyUnicode_1BYTE_KIND:
return escape_unicode_kind1((PyUnicodeObject*) s);
case PyUnicode_2BYTE_KIND:
return escape_unicode_kind2((PyUnicodeObject*) s);
case PyUnicode_4BYTE_KIND:
return escape_unicode_kind4((PyUnicodeObject*) s);
}
assert(0); /* shouldn't happen */
return NULL;
}
static PyMethodDef module_methods[] = {
{"_escape_inner", (PyCFunction)escape_unicode, METH_O, NULL},
{NULL, NULL, 0, NULL} /* Sentinel */
};
static struct PyModuleDef module_definition = {
PyModuleDef_HEAD_INIT,
"markupsafe._speedups",
NULL,
-1,
module_methods,
NULL,
NULL,
NULL,
NULL
};
PyMODINIT_FUNC
PyInit__speedups(void)
{
PyObject *m = PyModule_Create(&module_definition);
if (m == NULL) {
return NULL;
}
#ifdef Py_GIL_DISABLED
PyUnstable_Module_SetGIL(m, Py_MOD_GIL_NOT_USED);
#endif
return m;
}
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