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2135 lines (1852 loc) · 62.5 KB
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#ifndef Py_BUILD_CORE_BUILTIN
# define Py_BUILD_CORE_MODULE 1
#endif
#include "Python.h"
#include "pycore_import.h" // _PyImport_SetModule()
#include "pycore_pyhash.h" // _Py_HashSecret
#include "pycore_traceback.h" // _PyTraceback_Add()
#include <stddef.h> // offsetof()
#include "expat.h"
#include "pyexpat.h"
/* Do not emit Clinic output to a file as that wreaks havoc with conditionally
included methods. */
/*[clinic input]
module pyexpat
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=b168d503a4490c15]*/
#define XML_COMBINED_VERSION (10000*XML_MAJOR_VERSION+100*XML_MINOR_VERSION+XML_MICRO_VERSION)
static XML_Memory_Handling_Suite ExpatMemoryHandler = {
PyObject_Malloc, PyObject_Realloc, PyObject_Free};
enum HandlerTypes {
StartElement,
EndElement,
ProcessingInstruction,
CharacterData,
UnparsedEntityDecl,
NotationDecl,
StartNamespaceDecl,
EndNamespaceDecl,
Comment,
StartCdataSection,
EndCdataSection,
Default,
DefaultHandlerExpand,
NotStandalone,
ExternalEntityRef,
StartDoctypeDecl,
EndDoctypeDecl,
EntityDecl,
XmlDecl,
ElementDecl,
AttlistDecl,
#if XML_COMBINED_VERSION >= 19504
SkippedEntity,
#endif
_DummyDecl
};
typedef struct {
PyTypeObject *xml_parse_type;
PyObject *error;
PyObject *str_read;
} pyexpat_state;
static inline pyexpat_state*
pyexpat_get_state(PyObject *module)
{
void *state = PyModule_GetState(module);
assert(state != NULL);
return (pyexpat_state *)state;
}
/* ----------------------------------------------------- */
/* Declarations for objects of type xmlparser */
typedef struct {
PyObject_HEAD
XML_Parser itself;
int ordered_attributes; /* Return attributes as a list. */
int specified_attributes; /* Report only specified attributes. */
int in_callback; /* Is a callback active? */
int ns_prefixes; /* Namespace-triplets mode? */
XML_Char *buffer; /* Buffer used when accumulating characters */
/* NULL if not enabled */
int buffer_size; /* Size of buffer, in XML_Char units */
int buffer_used; /* Buffer units in use */
PyObject *intern; /* Dictionary to intern strings */
PyObject **handlers;
} xmlparseobject;
#include "clinic/pyexpat.c.h"
#define CHARACTER_DATA_BUFFER_SIZE 8192
typedef void (*xmlhandlersetter)(XML_Parser self, void *meth);
typedef void* xmlhandler;
struct HandlerInfo {
const char *name;
xmlhandlersetter setter;
xmlhandler handler;
PyGetSetDef getset;
};
static struct HandlerInfo handler_info[64];
/* Set an integer attribute on the error object; return true on success,
* false on an exception.
*/
static int
set_error_attr(PyObject *err, const char *name, int value)
{
PyObject *v = PyLong_FromLong(value);
if (v == NULL || PyObject_SetAttrString(err, name, v) == -1) {
Py_XDECREF(v);
return 0;
}
Py_DECREF(v);
return 1;
}
/* Build and set an Expat exception, including positioning
* information. Always returns NULL.
*/
static PyObject *
set_error(pyexpat_state *state, xmlparseobject *self, enum XML_Error code)
{
PyObject *err;
PyObject *buffer;
XML_Parser parser = self->itself;
int lineno = XML_GetErrorLineNumber(parser);
int column = XML_GetErrorColumnNumber(parser);
buffer = PyUnicode_FromFormat("%s: line %i, column %i",
XML_ErrorString(code), lineno, column);
if (buffer == NULL)
return NULL;
err = PyObject_CallOneArg(state->error, buffer);
Py_DECREF(buffer);
if ( err != NULL
&& set_error_attr(err, "code", code)
&& set_error_attr(err, "offset", column)
&& set_error_attr(err, "lineno", lineno)) {
PyErr_SetObject(state->error, err);
}
Py_XDECREF(err);
return NULL;
}
static int
have_handler(xmlparseobject *self, int type)
{
PyObject *handler = self->handlers[type];
return handler != NULL;
}
/* Convert a string of XML_Chars into a Unicode string.
Returns None if str is a null pointer. */
static PyObject *
conv_string_to_unicode(const XML_Char *str)
{
/* XXX currently this code assumes that XML_Char is 8-bit,
and hence in UTF-8. */
/* UTF-8 from Expat, Unicode desired */
if (str == NULL) {
Py_RETURN_NONE;
}
return PyUnicode_DecodeUTF8(str, strlen(str), "strict");
}
static PyObject *
conv_string_len_to_unicode(const XML_Char *str, int len)
{
/* XXX currently this code assumes that XML_Char is 8-bit,
and hence in UTF-8. */
/* UTF-8 from Expat, Unicode desired */
if (str == NULL) {
Py_RETURN_NONE;
}
return PyUnicode_DecodeUTF8((const char *)str, len, "strict");
}
/* Callback routines */
static void clear_handlers(xmlparseobject *self, int initial);
/* This handler is used when an error has been detected, in the hope
that actual parsing can be terminated early. This will only help
if an external entity reference is encountered. */
static int
error_external_entity_ref_handler(XML_Parser parser,
const XML_Char *context,
const XML_Char *base,
const XML_Char *systemId,
const XML_Char *publicId)
{
return 0;
}
/* Dummy character data handler used when an error (exception) has
been detected, and the actual parsing can be terminated early.
This is needed since character data handler can't be safely removed
from within the character data handler, but can be replaced. It is
used only from the character data handler trampoline, and must be
used right after `flag_error()` is called. */
static void
noop_character_data_handler(void *userData, const XML_Char *data, int len)
{
/* Do nothing. */
}
static void
flag_error(xmlparseobject *self)
{
clear_handlers(self, 0);
XML_SetExternalEntityRefHandler(self->itself,
error_external_entity_ref_handler);
}
static PyObject*
call_with_frame(const char *funcname, int lineno, PyObject* func, PyObject* args,
xmlparseobject *self)
{
PyObject *res;
res = PyObject_Call(func, args, NULL);
if (res == NULL) {
_PyTraceback_Add(funcname, __FILE__, lineno);
XML_StopParser(self->itself, XML_FALSE);
}
return res;
}
static PyObject*
string_intern(xmlparseobject *self, const char* str)
{
PyObject *result = conv_string_to_unicode(str);
PyObject *value;
/* result can be NULL if the unicode conversion failed. */
if (!result)
return result;
if (!self->intern)
return result;
if (PyDict_GetItemRef(self->intern, result, &value) == 0 &&
PyDict_SetItem(self->intern, result, result) == 0)
{
return result;
}
assert((value != NULL) == !PyErr_Occurred());
Py_DECREF(result);
return value;
}
/* Return 0 on success, -1 on exception.
* flag_error() will be called before return if needed.
*/
static int
call_character_handler(xmlparseobject *self, const XML_Char *buffer, int len)
{
PyObject *args;
PyObject *temp;
if (!have_handler(self, CharacterData))
return -1;
args = PyTuple_New(1);
if (args == NULL)
return -1;
temp = (conv_string_len_to_unicode(buffer, len));
if (temp == NULL) {
Py_DECREF(args);
flag_error(self);
XML_SetCharacterDataHandler(self->itself,
noop_character_data_handler);
return -1;
}
PyTuple_SET_ITEM(args, 0, temp);
/* temp is now a borrowed reference; consider it unused. */
self->in_callback = 1;
temp = call_with_frame("CharacterData", __LINE__,
self->handlers[CharacterData], args, self);
/* temp is an owned reference again, or NULL */
self->in_callback = 0;
Py_DECREF(args);
if (temp == NULL) {
flag_error(self);
XML_SetCharacterDataHandler(self->itself,
noop_character_data_handler);
return -1;
}
Py_DECREF(temp);
return 0;
}
static int
flush_character_buffer(xmlparseobject *self)
{
int rc;
if (self->buffer == NULL || self->buffer_used == 0)
return 0;
rc = call_character_handler(self, self->buffer, self->buffer_used);
self->buffer_used = 0;
return rc;
}
static void
my_CharacterDataHandler(void *userData, const XML_Char *data, int len)
{
xmlparseobject *self = (xmlparseobject *) userData;
if (PyErr_Occurred())
return;
if (self->buffer == NULL)
call_character_handler(self, data, len);
else {
if ((self->buffer_used + len) > self->buffer_size) {
if (flush_character_buffer(self) < 0)
return;
/* handler might have changed; drop the rest on the floor
* if there isn't a handler anymore
*/
if (!have_handler(self, CharacterData))
return;
}
if (len > self->buffer_size) {
call_character_handler(self, data, len);
self->buffer_used = 0;
}
else {
memcpy(self->buffer + self->buffer_used,
data, len * sizeof(XML_Char));
self->buffer_used += len;
}
}
}
static void
my_StartElementHandler(void *userData,
const XML_Char *name, const XML_Char *atts[])
{
xmlparseobject *self = (xmlparseobject *)userData;
if (have_handler(self, StartElement)) {
PyObject *container, *rv, *args;
int i, max;
if (PyErr_Occurred())
return;
if (flush_character_buffer(self) < 0)
return;
/* Set max to the number of slots filled in atts[]; max/2 is
* the number of attributes we need to process.
*/
if (self->specified_attributes) {
max = XML_GetSpecifiedAttributeCount(self->itself);
}
else {
max = 0;
while (atts[max] != NULL)
max += 2;
}
/* Build the container. */
if (self->ordered_attributes)
container = PyList_New(max);
else
container = PyDict_New();
if (container == NULL) {
flag_error(self);
return;
}
for (i = 0; i < max; i += 2) {
PyObject *n = string_intern(self, (XML_Char *) atts[i]);
PyObject *v;
if (n == NULL) {
flag_error(self);
Py_DECREF(container);
return;
}
v = conv_string_to_unicode((XML_Char *) atts[i+1]);
if (v == NULL) {
flag_error(self);
Py_DECREF(container);
Py_DECREF(n);
return;
}
if (self->ordered_attributes) {
PyList_SET_ITEM(container, i, n);
PyList_SET_ITEM(container, i+1, v);
}
else if (PyDict_SetItem(container, n, v)) {
flag_error(self);
Py_DECREF(n);
Py_DECREF(v);
Py_DECREF(container);
return;
}
else {
Py_DECREF(n);
Py_DECREF(v);
}
}
args = string_intern(self, name);
if (args == NULL) {
Py_DECREF(container);
return;
}
args = Py_BuildValue("(NN)", args, container);
if (args == NULL) {
return;
}
/* Container is now a borrowed reference; ignore it. */
self->in_callback = 1;
rv = call_with_frame("StartElement", __LINE__,
self->handlers[StartElement], args, self);
self->in_callback = 0;
Py_DECREF(args);
if (rv == NULL) {
flag_error(self);
return;
}
Py_DECREF(rv);
}
}
#define RC_HANDLER(RC, NAME, PARAMS, INIT, PARAM_FORMAT, CONVERSION, \
RETURN, GETUSERDATA) \
static RC \
my_##NAME##Handler PARAMS {\
xmlparseobject *self = GETUSERDATA ; \
PyObject *args = NULL; \
PyObject *rv = NULL; \
INIT \
\
if (have_handler(self, NAME)) { \
if (PyErr_Occurred()) \
return RETURN; \
if (flush_character_buffer(self) < 0) \
return RETURN; \
args = Py_BuildValue PARAM_FORMAT ;\
if (!args) { flag_error(self); return RETURN;} \
self->in_callback = 1; \
rv = call_with_frame(#NAME,__LINE__, \
self->handlers[NAME], args, self); \
self->in_callback = 0; \
Py_DECREF(args); \
if (rv == NULL) { \
flag_error(self); \
return RETURN; \
} \
CONVERSION \
Py_DECREF(rv); \
} \
return RETURN; \
}
#define VOID_HANDLER(NAME, PARAMS, PARAM_FORMAT) \
RC_HANDLER(void, NAME, PARAMS, ;, PARAM_FORMAT, ;, ;,\
(xmlparseobject *)userData)
#define INT_HANDLER(NAME, PARAMS, PARAM_FORMAT)\
RC_HANDLER(int, NAME, PARAMS, int rc=0;, PARAM_FORMAT, \
rc = PyLong_AsLong(rv);, rc, \
(xmlparseobject *)userData)
VOID_HANDLER(EndElement,
(void *userData, const XML_Char *name),
("(N)", string_intern(self, name)))
VOID_HANDLER(ProcessingInstruction,
(void *userData,
const XML_Char *target,
const XML_Char *data),
("(NO&)", string_intern(self, target), conv_string_to_unicode ,data))
VOID_HANDLER(UnparsedEntityDecl,
(void *userData,
const XML_Char *entityName,
const XML_Char *base,
const XML_Char *systemId,
const XML_Char *publicId,
const XML_Char *notationName),
("(NNNNN)",
string_intern(self, entityName), string_intern(self, base),
string_intern(self, systemId), string_intern(self, publicId),
string_intern(self, notationName)))
VOID_HANDLER(EntityDecl,
(void *userData,
const XML_Char *entityName,
int is_parameter_entity,
const XML_Char *value,
int value_length,
const XML_Char *base,
const XML_Char *systemId,
const XML_Char *publicId,
const XML_Char *notationName),
("NiNNNNN",
string_intern(self, entityName), is_parameter_entity,
(conv_string_len_to_unicode(value, value_length)),
string_intern(self, base), string_intern(self, systemId),
string_intern(self, publicId),
string_intern(self, notationName)))
VOID_HANDLER(XmlDecl,
(void *userData,
const XML_Char *version,
const XML_Char *encoding,
int standalone),
("(O&O&i)",
conv_string_to_unicode ,version, conv_string_to_unicode ,encoding,
standalone))
static PyObject *
conv_content_model(XML_Content * const model,
PyObject *(*conv_string)(const XML_Char *))
{
PyObject *result = NULL;
PyObject *children = PyTuple_New(model->numchildren);
int i;
if (children != NULL) {
assert(model->numchildren < INT_MAX);
for (i = 0; i < (int)model->numchildren; ++i) {
PyObject *child = conv_content_model(&model->children[i],
conv_string);
if (child == NULL) {
Py_XDECREF(children);
return NULL;
}
PyTuple_SET_ITEM(children, i, child);
}
result = Py_BuildValue("(iiO&N)",
model->type, model->quant,
conv_string,model->name, children);
}
return result;
}
static void
my_ElementDeclHandler(void *userData,
const XML_Char *name,
XML_Content *model)
{
xmlparseobject *self = (xmlparseobject *)userData;
PyObject *args = NULL;
if (have_handler(self, ElementDecl)) {
PyObject *rv = NULL;
PyObject *modelobj, *nameobj;
if (PyErr_Occurred())
return;
if (flush_character_buffer(self) < 0)
goto finally;
modelobj = conv_content_model(model, (conv_string_to_unicode));
if (modelobj == NULL) {
flag_error(self);
goto finally;
}
nameobj = string_intern(self, name);
if (nameobj == NULL) {
Py_DECREF(modelobj);
flag_error(self);
goto finally;
}
args = Py_BuildValue("NN", nameobj, modelobj);
if (args == NULL) {
flag_error(self);
goto finally;
}
self->in_callback = 1;
rv = call_with_frame("ElementDecl", __LINE__,
self->handlers[ElementDecl], args, self);
self->in_callback = 0;
if (rv == NULL) {
flag_error(self);
goto finally;
}
Py_DECREF(rv);
}
finally:
Py_XDECREF(args);
XML_FreeContentModel(self->itself, model);
return;
}
VOID_HANDLER(AttlistDecl,
(void *userData,
const XML_Char *elname,
const XML_Char *attname,
const XML_Char *att_type,
const XML_Char *dflt,
int isrequired),
("(NNO&O&i)",
string_intern(self, elname), string_intern(self, attname),
conv_string_to_unicode ,att_type, conv_string_to_unicode ,dflt,
isrequired))
#if XML_COMBINED_VERSION >= 19504
VOID_HANDLER(SkippedEntity,
(void *userData,
const XML_Char *entityName,
int is_parameter_entity),
("Ni",
string_intern(self, entityName), is_parameter_entity))
#endif
VOID_HANDLER(NotationDecl,
(void *userData,
const XML_Char *notationName,
const XML_Char *base,
const XML_Char *systemId,
const XML_Char *publicId),
("(NNNN)",
string_intern(self, notationName), string_intern(self, base),
string_intern(self, systemId), string_intern(self, publicId)))
VOID_HANDLER(StartNamespaceDecl,
(void *userData,
const XML_Char *prefix,
const XML_Char *uri),
("(NN)",
string_intern(self, prefix), string_intern(self, uri)))
VOID_HANDLER(EndNamespaceDecl,
(void *userData,
const XML_Char *prefix),
("(N)", string_intern(self, prefix)))
VOID_HANDLER(Comment,
(void *userData, const XML_Char *data),
("(O&)", conv_string_to_unicode ,data))
VOID_HANDLER(StartCdataSection,
(void *userData),
("()"))
VOID_HANDLER(EndCdataSection,
(void *userData),
("()"))
VOID_HANDLER(Default,
(void *userData, const XML_Char *s, int len),
("(N)", (conv_string_len_to_unicode(s,len))))
VOID_HANDLER(DefaultHandlerExpand,
(void *userData, const XML_Char *s, int len),
("(N)", (conv_string_len_to_unicode(s,len))))
#define my_DefaultHandlerExpand my_DefaultHandlerExpandHandler
INT_HANDLER(NotStandalone,
(void *userData),
("()"))
RC_HANDLER(int, ExternalEntityRef,
(XML_Parser parser,
const XML_Char *context,
const XML_Char *base,
const XML_Char *systemId,
const XML_Char *publicId),
int rc=0;,
("(O&NNN)",
conv_string_to_unicode ,context, string_intern(self, base),
string_intern(self, systemId), string_intern(self, publicId)),
rc = PyLong_AsLong(rv);, rc,
XML_GetUserData(parser))
/* XXX UnknownEncodingHandler */
VOID_HANDLER(StartDoctypeDecl,
(void *userData, const XML_Char *doctypeName,
const XML_Char *sysid, const XML_Char *pubid,
int has_internal_subset),
("(NNNi)", string_intern(self, doctypeName),
string_intern(self, sysid), string_intern(self, pubid),
has_internal_subset))
VOID_HANDLER(EndDoctypeDecl, (void *userData), ("()"))
/* ---------------------------------------------------------------- */
/*[clinic input]
class pyexpat.xmlparser "xmlparseobject *" "&Xmlparsetype"
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=2393162385232e1c]*/
static PyObject *
get_parse_result(pyexpat_state *state, xmlparseobject *self, int rv)
{
if (PyErr_Occurred()) {
return NULL;
}
if (rv == 0) {
return set_error(state, self, XML_GetErrorCode(self->itself));
}
if (flush_character_buffer(self) < 0) {
return NULL;
}
return PyLong_FromLong(rv);
}
#define MAX_CHUNK_SIZE (1 << 20)
/*[clinic input]
pyexpat.xmlparser.Parse
cls: defining_class
data: object
isfinal: bool = False
/
Parse XML data.
`isfinal' should be true at end of input.
[clinic start generated code]*/
static PyObject *
pyexpat_xmlparser_Parse_impl(xmlparseobject *self, PyTypeObject *cls,
PyObject *data, int isfinal)
/*[clinic end generated code: output=8faffe07fe1f862a input=d0eb2a69fab3b9f1]*/
{
const char *s;
Py_ssize_t slen;
Py_buffer view;
int rc;
pyexpat_state *state = PyType_GetModuleState(cls);
if (PyUnicode_Check(data)) {
view.buf = NULL;
s = PyUnicode_AsUTF8AndSize(data, &slen);
if (s == NULL)
return NULL;
/* Explicitly set UTF-8 encoding. Return code ignored. */
(void)XML_SetEncoding(self->itself, "utf-8");
}
else {
if (PyObject_GetBuffer(data, &view, PyBUF_SIMPLE) < 0)
return NULL;
s = view.buf;
slen = view.len;
}
static_assert(MAX_CHUNK_SIZE <= INT_MAX,
"MAX_CHUNK_SIZE is larger than INT_MAX");
while (slen > MAX_CHUNK_SIZE) {
rc = XML_Parse(self->itself, s, MAX_CHUNK_SIZE, 0);
if (!rc)
goto done;
s += MAX_CHUNK_SIZE;
slen -= MAX_CHUNK_SIZE;
}
assert(slen <= INT_MAX);
rc = XML_Parse(self->itself, s, (int)slen, isfinal);
done:
if (view.buf != NULL) {
PyBuffer_Release(&view);
}
return get_parse_result(state, self, rc);
}
/* File reading copied from cPickle */
#define BUF_SIZE 2048
static int
readinst(char *buf, int buf_size, PyObject *meth)
{
PyObject *str;
Py_ssize_t len;
const char *ptr;
str = PyObject_CallFunction(meth, "i", buf_size);
if (str == NULL)
goto error;
if (PyBytes_Check(str))
ptr = PyBytes_AS_STRING(str);
else if (PyByteArray_Check(str))
ptr = PyByteArray_AS_STRING(str);
else {
PyErr_Format(PyExc_TypeError,
"read() did not return a bytes object (type=%.400s)",
Py_TYPE(str)->tp_name);
goto error;
}
len = Py_SIZE(str);
if (len > buf_size) {
PyErr_Format(PyExc_ValueError,
"read() returned too much data: "
"%i bytes requested, %zd returned",
buf_size, len);
goto error;
}
memcpy(buf, ptr, len);
Py_DECREF(str);
/* len <= buf_size <= INT_MAX */
return (int)len;
error:
Py_XDECREF(str);
return -1;
}
/*[clinic input]
pyexpat.xmlparser.ParseFile
cls: defining_class
file: object
/
Parse XML data from file-like object.
[clinic start generated code]*/
static PyObject *
pyexpat_xmlparser_ParseFile_impl(xmlparseobject *self, PyTypeObject *cls,
PyObject *file)
/*[clinic end generated code: output=34780a094c8ca3ae input=ba4bc9c541684793]*/
{
int rv = 1;
PyObject *readmethod = NULL;
pyexpat_state *state = PyType_GetModuleState(cls);
if (PyObject_GetOptionalAttr(file, state->str_read, &readmethod) < 0) {
return NULL;
}
if (readmethod == NULL) {
PyErr_SetString(PyExc_TypeError,
"argument must have 'read' attribute");
return NULL;
}
for (;;) {
int bytes_read;
void *buf = XML_GetBuffer(self->itself, BUF_SIZE);
if (buf == NULL) {
Py_XDECREF(readmethod);
return get_parse_result(state, self, 0);
}
bytes_read = readinst(buf, BUF_SIZE, readmethod);
if (bytes_read < 0) {
Py_DECREF(readmethod);
return NULL;
}
rv = XML_ParseBuffer(self->itself, bytes_read, bytes_read == 0);
if (PyErr_Occurred()) {
Py_XDECREF(readmethod);
return NULL;
}
if (!rv || bytes_read == 0)
break;
}
Py_XDECREF(readmethod);
return get_parse_result(state, self, rv);
}
/*[clinic input]
pyexpat.xmlparser.SetBase
base: str
/
Set the base URL for the parser.
[clinic start generated code]*/
static PyObject *
pyexpat_xmlparser_SetBase_impl(xmlparseobject *self, const char *base)
/*[clinic end generated code: output=c212ddceb607b539 input=c684e5de895ee1a8]*/
{
if (!XML_SetBase(self->itself, base)) {
return PyErr_NoMemory();
}
Py_RETURN_NONE;
}
/*[clinic input]
pyexpat.xmlparser.GetBase
Return base URL string for the parser.
[clinic start generated code]*/
static PyObject *
pyexpat_xmlparser_GetBase_impl(xmlparseobject *self)
/*[clinic end generated code: output=2886cb21f9a8739a input=918d71c38009620e]*/
{
return conv_string_to_unicode(XML_GetBase(self->itself));
}
/*[clinic input]
pyexpat.xmlparser.GetInputContext
Return the untranslated text of the input that caused the current event.
If the event was generated by a large amount of text (such as a start tag
for an element with many attributes), not all of the text may be available.
[clinic start generated code]*/
static PyObject *
pyexpat_xmlparser_GetInputContext_impl(xmlparseobject *self)
/*[clinic end generated code: output=a88026d683fc22cc input=034df8712db68379]*/
{
if (self->in_callback) {
int offset, size;
const char *buffer
= XML_GetInputContext(self->itself, &offset, &size);
if (buffer != NULL)
return PyBytes_FromStringAndSize(buffer + offset,
size - offset);
else
Py_RETURN_NONE;
}
else
Py_RETURN_NONE;
}
/*[clinic input]
pyexpat.xmlparser.ExternalEntityParserCreate
cls: defining_class
context: str(accept={str, NoneType})
encoding: str = NULL
/
Create a parser for parsing an external entity based on the information passed to the ExternalEntityRefHandler.
[clinic start generated code]*/
static PyObject *
pyexpat_xmlparser_ExternalEntityParserCreate_impl(xmlparseobject *self,
PyTypeObject *cls,
const char *context,
const char *encoding)
/*[clinic end generated code: output=01d4472b49cb3f92 input=ec70c6b9e6e9619a]*/
{
xmlparseobject *new_parser;
int i;
pyexpat_state *state = PyType_GetModuleState(cls);
new_parser = PyObject_GC_New(xmlparseobject, state->xml_parse_type);
if (new_parser == NULL) {
return NULL;
}
new_parser->buffer_size = self->buffer_size;
new_parser->buffer_used = 0;
new_parser->buffer = NULL;
new_parser->ordered_attributes = self->ordered_attributes;
new_parser->specified_attributes = self->specified_attributes;
new_parser->in_callback = 0;
new_parser->ns_prefixes = self->ns_prefixes;
new_parser->itself = XML_ExternalEntityParserCreate(self->itself, context,
encoding);
new_parser->handlers = 0;
new_parser->intern = Py_XNewRef(self->intern);
if (self->buffer != NULL) {
new_parser->buffer = PyMem_Malloc(new_parser->buffer_size);
if (new_parser->buffer == NULL) {
Py_DECREF(new_parser);
return PyErr_NoMemory();
}
}
if (!new_parser->itself) {
Py_DECREF(new_parser);
return PyErr_NoMemory();
}
XML_SetUserData(new_parser->itself, (void *)new_parser);
/* allocate and clear handlers first */
for (i = 0; handler_info[i].name != NULL; i++)
/* do nothing */;
new_parser->handlers = PyMem_New(PyObject *, i);
if (!new_parser->handlers) {
Py_DECREF(new_parser);
return PyErr_NoMemory();
}
clear_handlers(new_parser, 1);
/* then copy handlers from self */
for (i = 0; handler_info[i].name != NULL; i++) {
PyObject *handler = self->handlers[i];
if (handler != NULL) {
new_parser->handlers[i] = Py_NewRef(handler);
handler_info[i].setter(new_parser->itself,
handler_info[i].handler);
}
}
PyObject_GC_Track(new_parser);
return (PyObject *)new_parser;
}