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Copy pathTypeTreeHelper.cpp
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716 lines (663 loc) · 20 KB
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#include <TypeTreeHelper.hpp>
#include <cstdint>
#include <type_traits>
#include <swap.hpp>
#include <map>
// TypeTreeReader - impl
typedef struct Reader
{
uint8_t *ptr;
uint8_t *end;
uint8_t *start;
} ReaderT;
typedef struct TypeTreeReaderConfig
{
bool as_dict;
PyObject *classes;
PyObject *assetfile;
PyObject *clean_name;
} TypeTreeReaderConfigT;
inline void align4(ReaderT *reader)
{
size_t offset = (size_t)reader->ptr - (size_t)reader->start;
size_t aligned_offset = (offset + 4 - 1) & ~(4 - 1);
reader->ptr = reader->start + aligned_offset;
}
inline PyObject *read_bool(ReaderT *reader)
{
if (reader->ptr + 1 > reader->end)
{
PyErr_SetString(PyExc_ValueError, "read_bool out of bounds");
return NULL;
}
return *reader->ptr++ ? Py_True : Py_False;
}
inline PyObject *read_u8(ReaderT *reader)
{
if (reader->ptr + 1 > reader->end)
{
PyErr_SetString(PyExc_ValueError, "read_u8 out of bounds");
return NULL;
}
return PyLong_FromUnsignedLong(*reader->ptr++);
}
inline PyObject *read_s8(ReaderT *reader)
{
if (reader->ptr + 1 > reader->end)
{
PyErr_SetString(PyExc_ValueError, "read_s8 out of bounds");
return NULL;
}
return PyLong_FromLong((int8_t)*reader->ptr++);
}
template <typename T, bool swap>
inline PyObject *read_int(ReaderT *reader)
{
static_assert(std::is_integral<T>::value, "Unsupported type for read_int");
if (reader->ptr + sizeof(T) > reader->end)
{
PyErr_SetString(PyExc_ValueError, "read_int out of bounds");
return NULL;
}
T value = *(T *)reader->ptr;
if constexpr (swap)
{
swap_any_inplace(&value);
}
reader->ptr += sizeof(T);
if constexpr (std::is_signed<T>::value)
{
if constexpr (std::is_same<T, int64_t>::value)
{
return PyLong_FromLongLong(value);
}
else
{
return PyLong_FromLong((int32_t)value);
}
}
else
{
if constexpr (std::is_same<T, uint64_t>::value)
{
return PyLong_FromUnsignedLongLong(value);
}
else
{
return PyLong_FromUnsignedLong((uint32_t)value);
}
}
}
template <typename T, bool swap>
inline PyObject *read_float(ReaderT *reader)
{
static_assert(std::is_floating_point<T>::value, "Unsupported type for read_float");
if (reader->ptr + sizeof(T) > reader->end)
{
PyErr_SetString(PyExc_ValueError, "read_float out of bounds");
return NULL;
}
T value = *(T *)reader->ptr;
if constexpr (swap)
{
swap_any_inplace(&value);
}
reader->ptr += sizeof(T);
return PyFloat_FromDouble(value);
}
template <bool swap>
inline bool _read_length(ReaderT *reader, int32_t *length)
{
if (reader->ptr + sizeof(int32_t) > reader->end)
{
PyErr_SetString(PyExc_ValueError, "read_length out of bounds");
return false;
}
*length = *(int32_t *)reader->ptr;
if constexpr (swap)
{
swap_any_inplace(length);
}
reader->ptr += sizeof(int32_t);
return true;
}
template <bool swap>
inline PyObject *read_str(ReaderT *reader)
{
int32_t length;
if (!_read_length<swap>(reader, &length))
{
return NULL;
}
if (reader->ptr + length > reader->end)
{
PyErr_SetString(PyExc_ValueError, "read_str out of bounds");
return NULL;
}
PyObject *str = PyUnicode_DecodeUTF8((char *)reader->ptr, length, "surrogateescape");
reader->ptr += length;
align4(reader);
return str;
}
template <bool swap>
inline PyObject *read_bytes(ReaderT *reader)
{
int32_t length;
if (!_read_length<swap>(reader, &length))
{
return NULL;
}
if (reader->ptr + length > reader->end)
{
PyErr_SetString(PyExc_ValueError, "read_bytes out of bounds");
return NULL;
}
PyObject *bytes = PyBytes_FromStringAndSize((char *)reader->ptr, length);
reader->ptr += length;
return bytes;
}
template <bool swap>
inline PyObject *read_pair(ReaderT *reader, TypeTreeNodeObject *node, TypeTreeReaderConfigT *config)
{
if (PyList_GET_SIZE(node->m_Children) != 2)
{
PyErr_SetString(PyExc_ValueError, "Pair node must have 2 children");
return NULL;
}
PyObject *first = read_typetree_value<swap>(reader, (TypeTreeNodeObject *)PyList_GET_ITEM(node->m_Children, 0), config);
if (!first)
{
return NULL;
}
PyObject *second = read_typetree_value<swap>(reader, (TypeTreeNodeObject *)PyList_GET_ITEM(node->m_Children, 1), config);
if (!second)
{
Py_DECREF(first);
return NULL;
}
PyObject *pair = PyTuple_Pack(2, first, second);
Py_DECREF(first);
Py_DECREF(second);
return pair;
}
template <bool swap>
inline PyObject *parse_class(ReaderT *reader, PyObject *dict, TypeTreeNodeObject *node, TypeTreeReaderConfigT *config)
{
PyObject *clz = NULL;
// Determine the class based on node's _data_type
if (node->_data_type == NodeDataType::pptr)
{
if (PyDict_SetItemString(dict, "assetsfile", config->assetfile) != 0)
{
PyErr_SetString(PyExc_RuntimeError, "Failed to set 'assetsfile'");
Py_DECREF(dict);
return NULL;
}
clz = PyObject_GetAttrString(config->classes, "PPtr");
}
else
{
clz = PyObject_GetAttr(config->classes, node->m_Type);
if (clz == NULL)
{
clz = PyObject_GetAttrString(config->classes, "Object");
}
}
// check if class is found
if (clz == NULL)
{
PyErr_SetString(PyExc_ValueError, "Failed to get class");
Py_DECREF(clz);
Py_DECREF(dict);
return NULL;
}
// try to create class instance
PyObject *args = PyTuple_New(0);
PyObject *instance = PyObject_Call(clz, args, dict);
if (instance != NULL)
{
// success
// cleanup
Py_DECREF(clz);
Py_DECREF(args);
Py_DECREF(dict);
// return instance
return instance;
}
// failed, clear error
PyErr_Clear();
// clean key names
PyObject *key = NULL;
PyObject *keys = PyDict_Keys(dict);
PyObject *clean_args = PyTuple_New(1);
for (Py_ssize_t i = 0; i < PyList_GET_SIZE(keys); i++)
{
key = PyList_GET_ITEM(keys, i);
PyTuple_SET_ITEM(clean_args, 0, key);
PyObject *clean_key = PyObject_Call(config->clean_name, clean_args, NULL);
if (PyUnicode_Compare(key, clean_key))
{
PyObject *value = PyDict_GetItem(dict, key);
PyDict_SetItem(dict, clean_key, value);
PyDict_DelItem(dict, key);
}
Py_DECREF(clean_key);
}
// increase ref count for key, as PyTuple_SET_ITEM steals reference, so decref there will decref key
Py_INCREF(key);
Py_DECREF(clean_args);
Py_DECREF(keys);
// try to create class instance again with cleaned keys
instance = PyObject_Call(clz, args, dict);
if (instance != NULL)
{
// success
// cleanup
Py_DECREF(clz);
Py_DECREF(args);
Py_DECREF(dict);
// return instance
return instance;
}
// failed, clear error
PyErr_Clear();
// some keys might be extra, check against __annotations__
PyObject *annonations = PyObject_GetAttrString(clz, "__annotations__");
PyObject *extras = PyDict_New();
keys = PyDict_Keys(dict);
for (Py_ssize_t i = 0; i < PyList_Size(keys); i++)
{
PyObject *key = PyList_GET_ITEM(keys, i);
if (PyDict_Contains(annonations, key) == 0)
{
PyObject *value = PyDict_GetItem(dict, key);
PyDict_SetItem(extras, key, value);
PyDict_DelItem(dict, key);
}
}
Py_DECREF(keys);
Py_DECREF(annonations);
// try to create class instance again with cleaned keys
instance = PyObject_Call(clz, args, dict);
if (instance != NULL)
{
// success, manually set extra keys
PyObject *items = PyDict_Items(extras);
for (Py_ssize_t i = 0; i < PyList_Size(items); i++)
{
PyObject *item = PyList_GET_ITEM(items, i);
PyObject *key = PyTuple_GetItem(item, 0);
PyObject *value = PyTuple_GetItem(item, 1);
PyObject_SetAttr(instance, key, value);
}
Py_DECREF(items);
}
// cleanup
Py_DECREF(clz);
Py_DECREF(args);
Py_DECREF(dict);
Py_DECREF(extras);
// return instance or NULL if failed
return instance;
}
template <bool swap>
PyObject *read_typetree_value(ReaderT *reader, TypeTreeNodeObject *node, TypeTreeReaderConfigT *config)
{
bool align = node->_align;
PyObject *value = nullptr;
switch (node->_data_type)
{
case NodeDataType::u8:
value = read_u8(reader);
break;
case NodeDataType::u16:
value = read_int<uint16_t, swap>(reader);
break;
case NodeDataType::u32:
value = read_int<uint32_t, swap>(reader);
break;
case NodeDataType::u64:
value = read_int<uint64_t, swap>(reader);
break;
case NodeDataType::s8:
value = read_s8(reader);
break;
case NodeDataType::s16:
value = read_int<int16_t, swap>(reader);
break;
case NodeDataType::s32:
value = read_int<int32_t, swap>(reader);
break;
case NodeDataType::s64:
value = read_int<int64_t, swap>(reader);
break;
case NodeDataType::f32:
value = read_float<float, swap>(reader);
break;
case NodeDataType::f64:
value = read_float<double, swap>(reader);
break;
case NodeDataType::boolean:
value = read_bool(reader);
break;
case NodeDataType::str:
value = read_str<swap>(reader);
break;
case NodeDataType::bytes:
value = read_bytes<swap>(reader);
break;
case NodeDataType::pair:
value = read_pair<swap>(reader, node, config);
break;
default:
TypeTreeNodeObject *child = nullptr;
if (PyList_GET_SIZE(node->m_Children) > 0)
{
child = (TypeTreeNodeObject *)PyList_GET_ITEM(node->m_Children, 0);
}
if (child && child->_data_type == NodeDataType::array)
{
// array
if (child->_align)
{
align = true;
}
int32_t length;
if (!_read_length<swap>(reader, &length))
{
return NULL;
}
value = PyList_New(length);
child = (TypeTreeNodeObject *)PyList_GET_ITEM(child->m_Children, 1);
for (int i = 0; i < length; i++)
{
PyObject *item = read_typetree_value<swap>(reader, child, config);
if (!item)
{
Py_DECREF(value);
return NULL;
}
PyList_SET_ITEM(value, i, item);
}
}
else
{
// class
value = PyDict_New();
for (int i = 0; i < PyList_GET_SIZE(node->m_Children); i++)
{
child = (TypeTreeNodeObject *)PyList_GET_ITEM(node->m_Children, i);
PyObject *child_value = read_typetree_value<swap>(reader, child, config);
if (!child_value)
{
Py_DECREF(value);
return NULL;
}
if (PyDict_SetItem(value, child->m_Name, child_value))
{
Py_DECREF(value);
Py_DECREF(child_value);
return NULL;
}
// dict increases ref count, so we need to decref here
Py_DECREF(child_value);
}
if (!config->as_dict)
{
value = parse_class<swap>(reader, value, node, config);
}
}
}
if (align)
{
align4(reader);
}
return value;
}
PyObject *read_typetree(PyObject *self, PyObject *args, PyObject *kwargs)
{
const char *kwlist[] = {"data", "node", "endian", "as_dict", "assetsfile", "classes", "clean_name", NULL};
PyObject *data;
PyObject *node;
PyObject *as_dict = Py_True;
TypeTreeReaderConfigT config = {
false,
Py_None,
Py_None,
Py_None};
char endian;
bool swap;
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "OOC|OOOO", (char **)kwlist, &data, &node, &endian, &as_dict, &config.assetfile, &config.classes, &config.clean_name))
{
return NULL;
}
config.as_dict = as_dict == Py_True;
if (!config.as_dict)
{
if (PyCallable_Check(config.clean_name) == 0)
{
PyErr_SetString(PyExc_ValueError, "clean_name must be callable if not as dict");
return NULL;
}
if (config.assetfile == Py_None)
{
PyErr_SetString(PyExc_ValueError, "assetsfile must be set if not as dict");
return NULL;
}
if (config.classes == Py_None)
{
PyErr_SetString(PyExc_ValueError, "classes must be set if not as dict");
return NULL;
}
}
Py_INCREF(config.assetfile);
Py_INCREF(config.classes);
Py_INCREF(config.clean_name);
volatile uint16_t bint = 0x0100;
volatile bool is_big_endian = ((uint8_t *)&bint)[0] == 1;
switch (endian)
{
case '<':
if (is_big_endian)
{
swap = true;
}
else
{
swap = false;
}
break;
case '>':
if (is_big_endian)
{
swap = false;
}
else
{
swap = true;
}
break;
default:
PyErr_SetString(PyExc_ValueError, "Invalid endian");
break;
}
Py_buffer view;
if (PyObject_GetBuffer(data, &view, PyBUF_SIMPLE) == -1)
{
PyErr_SetString(PyExc_ValueError, "Failed to get buffer");
return NULL;
}
ReaderT reader = {static_cast<uint8_t *>(view.buf), static_cast<uint8_t *>(view.buf) + view.len, static_cast<uint8_t *>(view.buf)};
PyObject *value;
if (swap)
{
value = read_typetree_value<true>(&reader, (TypeTreeNodeObject *)node, &config);
}
else
{
value = read_typetree_value<false>(&reader, (TypeTreeNodeObject *)node, &config);
}
PyBuffer_Release(&view);
return value;
}
// TypeTreeNode impl
static void TypeTreeNode_dealloc(TypeTreeNodeObject *self)
{
Py_XDECREF(self->m_Level);
Py_XDECREF(self->m_Type);
Py_XDECREF(self->m_Name);
Py_XDECREF(self->m_ByteSize);
Py_XDECREF(self->m_TypeFlags);
Py_XDECREF(self->m_Version);
Py_XDECREF(self->m_VariableCount);
Py_XDECREF(self->m_Index);
Py_XDECREF(self->m_MetaFlag);
Py_XDECREF(self->m_RefTypeHash);
Py_XDECREF(self->m_Children);
Py_TYPE(self)->tp_free((PyObject *)self);
}
static const std::map<const char *, NodeDataType> typeToNodeDataType = {
{"SInt8", NodeDataType::s8},
{"UInt8", NodeDataType::u8},
{"char", NodeDataType::u8},
{"short", NodeDataType::s16},
{"SInt16", NodeDataType::s16},
{"unsigned short", NodeDataType::u16},
{"UInt16", NodeDataType::u16},
{"int", NodeDataType::s32},
{"SInt32", NodeDataType::s32},
{"unsigned int", NodeDataType::u32},
{"UInt32", NodeDataType::u32},
{"Type*", NodeDataType::u32},
{"long long", NodeDataType::s64},
{"SInt64", NodeDataType::s64},
{"unsigned long long", NodeDataType::u64},
{"UInt64", NodeDataType::u64},
{"FileSignature", NodeDataType::u64},
{"float", NodeDataType::f32},
{"double", NodeDataType::f64},
{"bool", NodeDataType::boolean},
{"string", NodeDataType::str},
{"TypelessData", NodeDataType::bytes},
{"pair", NodeDataType::pair},
{"Array", NodeDataType::array},
};
static int TypeTreeNode_init(TypeTreeNodeObject *self, PyObject *args, PyObject *kwargs)
{
const char *kwlist[] = {
"m_Level",
"m_Type",
"m_Name",
"m_ByteSize",
"m_Version",
"m_Children",
"m_TypeFlags",
"m_VariableCount",
"m_Index",
"m_MetaFlag",
"m_RefTypeHash",
NULL};
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "OOOOO|OOOOOO", (char **)kwlist,
&self->m_Level,
&self->m_Type,
&self->m_Name,
&self->m_ByteSize,
&self->m_Version,
&self->m_Children,
&self->m_TypeFlags,
&self->m_VariableCount,
&self->m_Index,
&self->m_MetaFlag,
&self->m_RefTypeHash))
{
return -1;
}
Py_INCREF(self->m_Level);
Py_INCREF(self->m_Type);
Py_INCREF(self->m_Name);
Py_INCREF(self->m_ByteSize);
Py_INCREF(self->m_Version);
// optional fields
if (self->m_Children == nullptr)
{
self->m_Children = PyList_New(0);
}
else
{
Py_XINCREF(self->m_Children);
}
#define SET_NONE_IF_NULL(field) \
{ \
if (self->field == nullptr) \
{ \
self->field = Py_None; \
} \
Py_INCREF(self->field); \
}
SET_NONE_IF_NULL(m_TypeFlags);
SET_NONE_IF_NULL(m_VariableCount);
SET_NONE_IF_NULL(m_Index);
SET_NONE_IF_NULL(m_MetaFlag);
SET_NONE_IF_NULL(m_RefTypeHash);
if (self->m_MetaFlag != Py_None && PyLong_AsLong(self->m_MetaFlag) & 0x4000)
{
self->_align = true;
}
if (self->m_Type != Py_None)
{
const char *type = PyUnicode_AsUTF8(self->m_Type);
self->_data_type = NodeDataType::unk;
if (type[0] == 'P' && type[1] == 'P' && type[2] == 't' && type[3] == 'r' && type[4] == '<')
{
self->_data_type = NodeDataType::pptr;
}
else
{
for (auto it = typeToNodeDataType.begin(); it != typeToNodeDataType.end(); ++it)
{
if (strcmp(it->first, type) == 0)
{
self->_data_type = it->second;
break;
}
}
}
}
return 0;
}
static PyMemberDef TypeTreeNode_members[] = {
{"m_Level", T_OBJECT_EX, offsetof(TypeTreeNodeObject, m_Level), 0, ""},
{"m_Type", T_OBJECT_EX, offsetof(TypeTreeNodeObject, m_Type), 0, ""},
{"m_Name", T_OBJECT_EX, offsetof(TypeTreeNodeObject, m_Name), 0, ""},
{"m_ByteSize", T_OBJECT_EX, offsetof(TypeTreeNodeObject, m_ByteSize), 0, ""},
{"m_TypeFlags", T_OBJECT_EX, offsetof(TypeTreeNodeObject, m_TypeFlags), 0, ""},
{"m_Version", T_OBJECT_EX, offsetof(TypeTreeNodeObject, m_Version), 0, ""},
{"m_Children", T_OBJECT_EX, offsetof(TypeTreeNodeObject, m_Children), 0, ""},
{"m_VariableCount", T_OBJECT_EX, offsetof(TypeTreeNodeObject, m_VariableCount), 0, ""},
{"m_Index", T_OBJECT_EX, offsetof(TypeTreeNodeObject, m_Index), 0, ""},
{"m_MetaFlag", T_OBJECT_EX, offsetof(TypeTreeNodeObject, m_MetaFlag), 0, ""},
{"m_RefTypeHash", T_OBJECT_EX, offsetof(TypeTreeNodeObject, m_RefTypeHash), 0, ""},
{NULL} /* Sentinel */
};
static PyTypeObject TypeTreeNodeType = []() -> PyTypeObject
{
PyTypeObject type = {PyObject_HEAD_INIT(NULL) 0};
type.tp_name = "TypeTreeHelper.TypeTreeNode";
type.tp_doc = "TypeTreeNode objects";
type.tp_basicsize = sizeof(TypeTreeNodeObject);
type.tp_itemsize = 0;
type.tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE;
type.tp_new = PyType_GenericNew;
type.tp_init = (initproc)TypeTreeNode_init;
type.tp_dealloc = (destructor)TypeTreeNode_dealloc;
type.tp_members = TypeTreeNode_members;
return type;
}();
int add_typetreenode_to_module(PyObject *m)
{
if (PyType_Ready(&TypeTreeNodeType) < 0)
return -1;
Py_INCREF(&TypeTreeNodeType);
PyModule_AddObject(m, "TypeTreeNode", (PyObject *)&TypeTreeNodeType);
return 0;
}