mirror of
https://github.com/msgpack/msgpack-python.git
synced 2025-11-04 03:20:56 +00:00
391 lines
11 KiB
C
391 lines
11 KiB
C
/*
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* MessagePack for Python unpacking routine
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*
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* Copyright (C) 2009 Naoki INADA
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define MSGPACK_EMBED_STACK_SIZE (1024)
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#include "unpack_define.h"
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typedef struct unpack_user {
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bool use_list;
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bool raw;
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bool has_pairs_hook;
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bool strict_map_key;
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int timestamp;
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PyObject *object_hook;
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PyObject *list_hook;
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PyObject *ext_hook;
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PyObject *timestamp_t;
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PyObject *giga;
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PyObject *utc;
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const char *unicode_errors;
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Py_ssize_t max_str_len, max_bin_len, max_array_len, max_map_len, max_ext_len;
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} unpack_user;
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typedef PyObject* msgpack_unpack_object;
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struct unpack_context;
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typedef struct unpack_context unpack_context;
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typedef int (*execute_fn)(unpack_context *ctx, const char* data, Py_ssize_t len, Py_ssize_t* off);
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static inline msgpack_unpack_object unpack_callback_root(unpack_user* u)
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{
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return NULL;
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}
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static inline int unpack_callback_uint16(unpack_user* u, uint16_t d, msgpack_unpack_object* o)
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{
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PyObject *p = PyLong_FromLong((long)d);
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if (!p)
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return -1;
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*o = p;
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return 0;
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}
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static inline int unpack_callback_uint8(unpack_user* u, uint8_t d, msgpack_unpack_object* o)
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{
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return unpack_callback_uint16(u, d, o);
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}
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static inline int unpack_callback_uint32(unpack_user* u, uint32_t d, msgpack_unpack_object* o)
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{
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PyObject *p = PyLong_FromSize_t((size_t)d);
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if (!p)
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return -1;
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*o = p;
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return 0;
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}
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static inline int unpack_callback_uint64(unpack_user* u, uint64_t d, msgpack_unpack_object* o)
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{
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PyObject *p;
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if (d > LONG_MAX) {
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p = PyLong_FromUnsignedLongLong((unsigned PY_LONG_LONG)d);
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} else {
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p = PyLong_FromLong((long)d);
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}
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if (!p)
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return -1;
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*o = p;
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return 0;
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}
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static inline int unpack_callback_int32(unpack_user* u, int32_t d, msgpack_unpack_object* o)
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{
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PyObject *p = PyLong_FromLong(d);
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if (!p)
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return -1;
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*o = p;
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return 0;
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}
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static inline int unpack_callback_int16(unpack_user* u, int16_t d, msgpack_unpack_object* o)
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{
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return unpack_callback_int32(u, d, o);
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}
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static inline int unpack_callback_int8(unpack_user* u, int8_t d, msgpack_unpack_object* o)
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{
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return unpack_callback_int32(u, d, o);
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}
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static inline int unpack_callback_int64(unpack_user* u, int64_t d, msgpack_unpack_object* o)
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{
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PyObject *p;
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if (d > LONG_MAX || d < LONG_MIN) {
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p = PyLong_FromLongLong((PY_LONG_LONG)d);
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} else {
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p = PyLong_FromLong((long)d);
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}
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*o = p;
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return 0;
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}
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static inline int unpack_callback_double(unpack_user* u, double d, msgpack_unpack_object* o)
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{
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PyObject *p = PyFloat_FromDouble(d);
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if (!p)
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return -1;
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*o = p;
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return 0;
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}
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static inline int unpack_callback_float(unpack_user* u, float d, msgpack_unpack_object* o)
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{
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return unpack_callback_double(u, d, o);
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}
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static inline int unpack_callback_nil(unpack_user* u, msgpack_unpack_object* o)
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{ Py_INCREF(Py_None); *o = Py_None; return 0; }
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static inline int unpack_callback_true(unpack_user* u, msgpack_unpack_object* o)
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{ Py_INCREF(Py_True); *o = Py_True; return 0; }
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static inline int unpack_callback_false(unpack_user* u, msgpack_unpack_object* o)
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{ Py_INCREF(Py_False); *o = Py_False; return 0; }
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static inline int unpack_callback_array(unpack_user* u, unsigned int n, msgpack_unpack_object* o)
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{
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if (n > u->max_array_len) {
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PyErr_Format(PyExc_ValueError, "%u exceeds max_array_len(%zd)", n, u->max_array_len);
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return -1;
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}
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PyObject *p = u->use_list ? PyList_New(n) : PyTuple_New(n);
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if (!p)
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return -1;
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*o = p;
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return 0;
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}
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static inline int unpack_callback_array_item(unpack_user* u, unsigned int current, msgpack_unpack_object* c, msgpack_unpack_object o)
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{
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if (u->use_list)
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PyList_SET_ITEM(*c, current, o);
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else
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PyTuple_SET_ITEM(*c, current, o);
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return 0;
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}
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static inline int unpack_callback_array_end(unpack_user* u, msgpack_unpack_object* c)
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{
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if (u->list_hook) {
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PyObject *new_c = PyObject_CallFunctionObjArgs(u->list_hook, *c, NULL);
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if (!new_c)
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return -1;
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Py_DECREF(*c);
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*c = new_c;
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}
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return 0;
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}
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static inline int unpack_callback_map(unpack_user* u, unsigned int n, msgpack_unpack_object* o)
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{
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if (n > u->max_map_len) {
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PyErr_Format(PyExc_ValueError, "%u exceeds max_map_len(%zd)", n, u->max_map_len);
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return -1;
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}
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PyObject *p;
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if (u->has_pairs_hook) {
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p = PyList_New(n); // Or use tuple?
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}
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else {
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p = PyDict_New();
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}
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if (!p)
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return -1;
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*o = p;
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return 0;
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}
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static inline int unpack_callback_map_item(unpack_user* u, unsigned int current, msgpack_unpack_object* c, msgpack_unpack_object k, msgpack_unpack_object v)
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{
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if (u->strict_map_key && !PyUnicode_CheckExact(k) && !PyBytes_CheckExact(k)) {
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PyErr_Format(PyExc_ValueError, "%.100s is not allowed for map key when strict_map_key=True", Py_TYPE(k)->tp_name);
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return -1;
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}
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if (PyUnicode_CheckExact(k)) {
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PyUnicode_InternInPlace(&k);
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}
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if (u->has_pairs_hook) {
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msgpack_unpack_object item = PyTuple_Pack(2, k, v);
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if (!item)
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return -1;
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Py_DECREF(k);
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Py_DECREF(v);
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PyList_SET_ITEM(*c, current, item);
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return 0;
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}
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else if (PyDict_SetItem(*c, k, v) == 0) {
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Py_DECREF(k);
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Py_DECREF(v);
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return 0;
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}
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return -1;
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}
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static inline int unpack_callback_map_end(unpack_user* u, msgpack_unpack_object* c)
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{
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if (u->object_hook) {
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PyObject *new_c = PyObject_CallFunctionObjArgs(u->object_hook, *c, NULL);
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if (!new_c)
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return -1;
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Py_DECREF(*c);
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*c = new_c;
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}
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return 0;
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}
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static inline int unpack_callback_raw(unpack_user* u, const char* b, const char* p, unsigned int l, msgpack_unpack_object* o)
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{
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if (l > u->max_str_len) {
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PyErr_Format(PyExc_ValueError, "%u exceeds max_str_len(%zd)", l, u->max_str_len);
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return -1;
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}
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PyObject *py;
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if (u->raw) {
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py = PyBytes_FromStringAndSize(p, l);
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} else {
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py = PyUnicode_DecodeUTF8(p, l, u->unicode_errors);
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}
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if (!py)
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return -1;
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*o = py;
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return 0;
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}
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static inline int unpack_callback_bin(unpack_user* u, const char* b, const char* p, unsigned int l, msgpack_unpack_object* o)
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{
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if (l > u->max_bin_len) {
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PyErr_Format(PyExc_ValueError, "%u exceeds max_bin_len(%zd)", l, u->max_bin_len);
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return -1;
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}
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PyObject *py = PyBytes_FromStringAndSize(p, l);
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if (!py)
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return -1;
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*o = py;
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return 0;
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}
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typedef struct msgpack_timestamp {
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int64_t tv_sec;
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uint32_t tv_nsec;
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} msgpack_timestamp;
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/*
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* Unpack ext buffer to a timestamp. Pulled from msgpack-c timestamp.h.
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*/
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static int unpack_timestamp(const char* buf, unsigned int buflen, msgpack_timestamp* ts) {
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switch (buflen) {
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case 4:
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ts->tv_nsec = 0;
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{
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uint32_t v = _msgpack_load32(uint32_t, buf);
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ts->tv_sec = (int64_t)v;
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}
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return 0;
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case 8: {
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uint64_t value =_msgpack_load64(uint64_t, buf);
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ts->tv_nsec = (uint32_t)(value >> 34);
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ts->tv_sec = value & 0x00000003ffffffffLL;
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return 0;
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}
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case 12:
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ts->tv_nsec = _msgpack_load32(uint32_t, buf);
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ts->tv_sec = _msgpack_load64(int64_t, buf + 4);
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return 0;
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default:
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return -1;
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}
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}
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#include "datetime.h"
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static int unpack_callback_ext(unpack_user* u, const char* base, const char* pos,
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unsigned int length, msgpack_unpack_object* o)
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{
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int8_t typecode = (int8_t)*pos++;
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if (!u->ext_hook) {
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PyErr_SetString(PyExc_AssertionError, "u->ext_hook cannot be NULL");
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return -1;
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}
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if (length-1 > u->max_ext_len) {
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PyErr_Format(PyExc_ValueError, "%u exceeds max_ext_len(%zd)", length, u->max_ext_len);
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return -1;
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}
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PyObject *py = NULL;
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// length also includes the typecode, so the actual data is length-1
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if (typecode == -1) {
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msgpack_timestamp ts;
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if (unpack_timestamp(pos, length-1, &ts) < 0) {
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return -1;
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}
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if (u->timestamp == 2) { // int
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PyObject *a = PyLong_FromLongLong(ts.tv_sec);
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if (a == NULL) return -1;
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PyObject *c = PyNumber_Multiply(a, u->giga);
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Py_DECREF(a);
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if (c == NULL) {
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return -1;
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}
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PyObject *b = PyLong_FromUnsignedLong(ts.tv_nsec);
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if (b == NULL) {
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Py_DECREF(c);
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return -1;
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}
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py = PyNumber_Add(c, b);
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Py_DECREF(c);
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Py_DECREF(b);
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}
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else if (u->timestamp == 0) { // Timestamp
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py = PyObject_CallFunction(u->timestamp_t, "(Lk)", ts.tv_sec, ts.tv_nsec);
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}
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else if (u->timestamp == 3) { // datetime
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// Calculate datetime using epoch + delta
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// due to limitations PyDateTime_FromTimestamp on Windows with negative timestamps
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PyObject *epoch = PyDateTimeAPI->DateTime_FromDateAndTime(1970, 1, 1, 0, 0, 0, 0, u->utc, PyDateTimeAPI->DateTimeType);
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if (epoch == NULL) {
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return -1;
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}
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PyObject* d = PyDelta_FromDSU(ts.tv_sec/(24*3600), ts.tv_sec%(24*3600), ts.tv_nsec / 1000);
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if (d == NULL) {
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Py_DECREF(epoch);
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return -1;
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}
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py = PyNumber_Add(epoch, d);
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Py_DECREF(epoch);
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Py_DECREF(d);
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}
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else { // float
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PyObject *a = PyFloat_FromDouble((double)ts.tv_nsec);
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if (a == NULL) return -1;
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PyObject *b = PyNumber_TrueDivide(a, u->giga);
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Py_DECREF(a);
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if (b == NULL) return -1;
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PyObject *c = PyLong_FromLongLong(ts.tv_sec);
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if (c == NULL) {
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Py_DECREF(b);
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return -1;
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}
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a = PyNumber_Add(b, c);
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Py_DECREF(b);
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Py_DECREF(c);
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py = a;
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}
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} else {
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py = PyObject_CallFunction(u->ext_hook, "(iy#)", (int)typecode, pos, (Py_ssize_t)length-1);
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}
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if (!py)
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return -1;
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*o = py;
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return 0;
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}
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#include "unpack_template.h"
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