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authorwolfbeast <mcwerewolf@gmail.com>2018-05-03 05:55:15 +0200
committerwolfbeast <mcwerewolf@gmail.com>2018-05-03 05:55:15 +0200
commit43f7a588f96aaf88e7b69441c3b50bc9c7b20df7 (patch)
tree07d9b26b2f357ee9de04fea0e5e4b8b9a1ff93a4 /security/sandbox/chromium/base/values.h
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Nuke the sandbox
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-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// This file specifies a recursive data storage class called Value intended for
-// storing settings and other persistable data.
-//
-// A Value represents something that can be stored in JSON or passed to/from
-// JavaScript. As such, it is NOT a generalized variant type, since only the
-// types supported by JavaScript/JSON are supported.
-//
-// IN PARTICULAR this means that there is no support for int64_t or unsigned
-// numbers. Writing JSON with such types would violate the spec. If you need
-// something like this, either use a double or make a string value containing
-// the number you want.
-
-#ifndef BASE_VALUES_H_
-#define BASE_VALUES_H_
-
-#include <stddef.h>
-#include <stdint.h>
-
-#include <iosfwd>
-#include <map>
-#include <string>
-#include <utility>
-#include <vector>
-
-#include "base/base_export.h"
-#include "base/compiler_specific.h"
-#include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/strings/string16.h"
-#include "base/strings/string_piece.h"
-
-namespace base {
-
-class BinaryValue;
-class DictionaryValue;
-class FundamentalValue;
-class ListValue;
-class StringValue;
-class Value;
-
-typedef std::vector<Value*> ValueVector;
-typedef std::map<std::string, Value*> ValueMap;
-
-// The Value class is the base class for Values. A Value can be instantiated
-// via the Create*Value() factory methods, or by directly creating instances of
-// the subclasses.
-//
-// See the file-level comment above for more information.
-class BASE_EXPORT Value {
- public:
- enum Type {
- TYPE_NULL = 0,
- TYPE_BOOLEAN,
- TYPE_INTEGER,
- TYPE_DOUBLE,
- TYPE_STRING,
- TYPE_BINARY,
- TYPE_DICTIONARY,
- TYPE_LIST
- // Note: Do not add more types. See the file-level comment above for why.
- };
-
- virtual ~Value();
-
- static scoped_ptr<Value> CreateNullValue();
-
- // Returns the type of the value stored by the current Value object.
- // Each type will be implemented by only one subclass of Value, so it's
- // safe to use the Type to determine whether you can cast from
- // Value* to (Implementing Class)*. Also, a Value object never changes
- // its type after construction.
- Type GetType() const { return type_; }
-
- // Returns true if the current object represents a given type.
- bool IsType(Type type) const { return type == type_; }
-
- // These methods allow the convenient retrieval of the contents of the Value.
- // If the current object can be converted into the given type, the value is
- // returned through the |out_value| parameter and true is returned;
- // otherwise, false is returned and |out_value| is unchanged.
- virtual bool GetAsBoolean(bool* out_value) const;
- virtual bool GetAsInteger(int* out_value) const;
- virtual bool GetAsDouble(double* out_value) const;
- virtual bool GetAsString(std::string* out_value) const;
- virtual bool GetAsString(string16* out_value) const;
- virtual bool GetAsString(const StringValue** out_value) const;
- virtual bool GetAsBinary(const BinaryValue** out_value) const;
- virtual bool GetAsList(ListValue** out_value);
- virtual bool GetAsList(const ListValue** out_value) const;
- virtual bool GetAsDictionary(DictionaryValue** out_value);
- virtual bool GetAsDictionary(const DictionaryValue** out_value) const;
- // Note: Do not add more types. See the file-level comment above for why.
-
- // This creates a deep copy of the entire Value tree, and returns a pointer
- // to the copy. The caller gets ownership of the copy, of course.
- //
- // Subclasses return their own type directly in their overrides;
- // this works because C++ supports covariant return types.
- virtual Value* DeepCopy() const;
- // Preferred version of DeepCopy. TODO(estade): remove the above.
- scoped_ptr<Value> CreateDeepCopy() const;
-
- // Compares if two Value objects have equal contents.
- virtual bool Equals(const Value* other) const;
-
- // Compares if two Value objects have equal contents. Can handle NULLs.
- // NULLs are considered equal but different from Value::CreateNullValue().
- static bool Equals(const Value* a, const Value* b);
-
- protected:
- // These aren't safe for end-users, but they are useful for subclasses.
- explicit Value(Type type);
- Value(const Value& that);
- Value& operator=(const Value& that);
-
- private:
- Type type_;
-};
-
-// FundamentalValue represents the simple fundamental types of values.
-class BASE_EXPORT FundamentalValue : public Value {
- public:
- explicit FundamentalValue(bool in_value);
- explicit FundamentalValue(int in_value);
- explicit FundamentalValue(double in_value);
- ~FundamentalValue() override;
-
- // Overridden from Value:
- bool GetAsBoolean(bool* out_value) const override;
- bool GetAsInteger(int* out_value) const override;
- // Values of both type TYPE_INTEGER and TYPE_DOUBLE can be obtained as
- // doubles.
- bool GetAsDouble(double* out_value) const override;
- FundamentalValue* DeepCopy() const override;
- bool Equals(const Value* other) const override;
-
- private:
- union {
- bool boolean_value_;
- int integer_value_;
- double double_value_;
- };
-};
-
-class BASE_EXPORT StringValue : public Value {
- public:
- // Initializes a StringValue with a UTF-8 narrow character string.
- explicit StringValue(const std::string& in_value);
-
- // Initializes a StringValue with a string16.
- explicit StringValue(const string16& in_value);
-
- ~StringValue() override;
-
- // Returns |value_| as a pointer or reference.
- std::string* GetString();
- const std::string& GetString() const;
-
- // Overridden from Value:
- bool GetAsString(std::string* out_value) const override;
- bool GetAsString(string16* out_value) const override;
- bool GetAsString(const StringValue** out_value) const override;
- StringValue* DeepCopy() const override;
- bool Equals(const Value* other) const override;
-
- private:
- std::string value_;
-};
-
-class BASE_EXPORT BinaryValue: public Value {
- public:
- // Creates a BinaryValue with a null buffer and size of 0.
- BinaryValue();
-
- // Creates a BinaryValue, taking ownership of the bytes pointed to by
- // |buffer|.
- BinaryValue(scoped_ptr<char[]> buffer, size_t size);
-
- ~BinaryValue() override;
-
- // For situations where you want to keep ownership of your buffer, this
- // factory method creates a new BinaryValue by copying the contents of the
- // buffer that's passed in.
- static BinaryValue* CreateWithCopiedBuffer(const char* buffer, size_t size);
-
- size_t GetSize() const { return size_; }
-
- // May return NULL.
- char* GetBuffer() { return buffer_.get(); }
- const char* GetBuffer() const { return buffer_.get(); }
-
- // Overridden from Value:
- bool GetAsBinary(const BinaryValue** out_value) const override;
- BinaryValue* DeepCopy() const override;
- bool Equals(const Value* other) const override;
-
- private:
- scoped_ptr<char[]> buffer_;
- size_t size_;
-
- DISALLOW_COPY_AND_ASSIGN(BinaryValue);
-};
-
-// DictionaryValue provides a key-value dictionary with (optional) "path"
-// parsing for recursive access; see the comment at the top of the file. Keys
-// are |std::string|s and should be UTF-8 encoded.
-class BASE_EXPORT DictionaryValue : public Value {
- public:
- // Returns |value| if it is a dictionary, nullptr otherwise.
- static scoped_ptr<DictionaryValue> From(scoped_ptr<Value> value);
-
- DictionaryValue();
- ~DictionaryValue() override;
-
- // Overridden from Value:
- bool GetAsDictionary(DictionaryValue** out_value) override;
- bool GetAsDictionary(const DictionaryValue** out_value) const override;
-
- // Returns true if the current dictionary has a value for the given key.
- bool HasKey(const std::string& key) const;
-
- // Returns the number of Values in this dictionary.
- size_t size() const { return dictionary_.size(); }
-
- // Returns whether the dictionary is empty.
- bool empty() const { return dictionary_.empty(); }
-
- // Clears any current contents of this dictionary.
- void Clear();
-
- // Sets the Value associated with the given path starting from this object.
- // A path has the form "<key>" or "<key>.<key>.[...]", where "." indexes
- // into the next DictionaryValue down. Obviously, "." can't be used
- // within a key, but there are no other restrictions on keys.
- // If the key at any step of the way doesn't exist, or exists but isn't
- // a DictionaryValue, a new DictionaryValue will be created and attached
- // to the path in that location. |in_value| must be non-null.
- void Set(const std::string& path, scoped_ptr<Value> in_value);
- // Deprecated version of the above. TODO(estade): remove.
- void Set(const std::string& path, Value* in_value);
-
- // Convenience forms of Set(). These methods will replace any existing
- // value at that path, even if it has a different type.
- void SetBoolean(const std::string& path, bool in_value);
- void SetInteger(const std::string& path, int in_value);
- void SetDouble(const std::string& path, double in_value);
- void SetString(const std::string& path, const std::string& in_value);
- void SetString(const std::string& path, const string16& in_value);
-
- // Like Set(), but without special treatment of '.'. This allows e.g. URLs to
- // be used as paths.
- void SetWithoutPathExpansion(const std::string& key,
- scoped_ptr<Value> in_value);
- // Deprecated version of the above. TODO(estade): remove.
- void SetWithoutPathExpansion(const std::string& key, Value* in_value);
-
- // Convenience forms of SetWithoutPathExpansion().
- void SetBooleanWithoutPathExpansion(const std::string& path, bool in_value);
- void SetIntegerWithoutPathExpansion(const std::string& path, int in_value);
- void SetDoubleWithoutPathExpansion(const std::string& path, double in_value);
- void SetStringWithoutPathExpansion(const std::string& path,
- const std::string& in_value);
- void SetStringWithoutPathExpansion(const std::string& path,
- const string16& in_value);
-
- // Gets the Value associated with the given path starting from this object.
- // A path has the form "<key>" or "<key>.<key>.[...]", where "." indexes
- // into the next DictionaryValue down. If the path can be resolved
- // successfully, the value for the last key in the path will be returned
- // through the |out_value| parameter, and the function will return true.
- // Otherwise, it will return false and |out_value| will be untouched.
- // Note that the dictionary always owns the value that's returned.
- // |out_value| is optional and will only be set if non-NULL.
- bool Get(StringPiece path, const Value** out_value) const;
- bool Get(StringPiece path, Value** out_value);
-
- // These are convenience forms of Get(). The value will be retrieved
- // and the return value will be true if the path is valid and the value at
- // the end of the path can be returned in the form specified.
- // |out_value| is optional and will only be set if non-NULL.
- bool GetBoolean(const std::string& path, bool* out_value) const;
- bool GetInteger(const std::string& path, int* out_value) const;
- // Values of both type TYPE_INTEGER and TYPE_DOUBLE can be obtained as
- // doubles.
- bool GetDouble(const std::string& path, double* out_value) const;
- bool GetString(const std::string& path, std::string* out_value) const;
- bool GetString(const std::string& path, string16* out_value) const;
- bool GetStringASCII(const std::string& path, std::string* out_value) const;
- bool GetBinary(const std::string& path, const BinaryValue** out_value) const;
- bool GetBinary(const std::string& path, BinaryValue** out_value);
- bool GetDictionary(StringPiece path,
- const DictionaryValue** out_value) const;
- bool GetDictionary(StringPiece path, DictionaryValue** out_value);
- bool GetList(const std::string& path, const ListValue** out_value) const;
- bool GetList(const std::string& path, ListValue** out_value);
-
- // Like Get(), but without special treatment of '.'. This allows e.g. URLs to
- // be used as paths.
- bool GetWithoutPathExpansion(const std::string& key,
- const Value** out_value) const;
- bool GetWithoutPathExpansion(const std::string& key, Value** out_value);
- bool GetBooleanWithoutPathExpansion(const std::string& key,
- bool* out_value) const;
- bool GetIntegerWithoutPathExpansion(const std::string& key,
- int* out_value) const;
- bool GetDoubleWithoutPathExpansion(const std::string& key,
- double* out_value) const;
- bool GetStringWithoutPathExpansion(const std::string& key,
- std::string* out_value) const;
- bool GetStringWithoutPathExpansion(const std::string& key,
- string16* out_value) const;
- bool GetDictionaryWithoutPathExpansion(
- const std::string& key,
- const DictionaryValue** out_value) const;
- bool GetDictionaryWithoutPathExpansion(const std::string& key,
- DictionaryValue** out_value);
- bool GetListWithoutPathExpansion(const std::string& key,
- const ListValue** out_value) const;
- bool GetListWithoutPathExpansion(const std::string& key,
- ListValue** out_value);
-
- // Removes the Value with the specified path from this dictionary (or one
- // of its child dictionaries, if the path is more than just a local key).
- // If |out_value| is non-NULL, the removed Value will be passed out via
- // |out_value|. If |out_value| is NULL, the removed value will be deleted.
- // This method returns true if |path| is a valid path; otherwise it will
- // return false and the DictionaryValue object will be unchanged.
- virtual bool Remove(const std::string& path, scoped_ptr<Value>* out_value);
-
- // Like Remove(), but without special treatment of '.'. This allows e.g. URLs
- // to be used as paths.
- virtual bool RemoveWithoutPathExpansion(const std::string& key,
- scoped_ptr<Value>* out_value);
-
- // Removes a path, clearing out all dictionaries on |path| that remain empty
- // after removing the value at |path|.
- virtual bool RemovePath(const std::string& path,
- scoped_ptr<Value>* out_value);
-
- // Makes a copy of |this| but doesn't include empty dictionaries and lists in
- // the copy. This never returns NULL, even if |this| itself is empty.
- scoped_ptr<DictionaryValue> DeepCopyWithoutEmptyChildren() const;
-
- // Merge |dictionary| into this dictionary. This is done recursively, i.e. any
- // sub-dictionaries will be merged as well. In case of key collisions, the
- // passed in dictionary takes precedence and data already present will be
- // replaced. Values within |dictionary| are deep-copied, so |dictionary| may
- // be freed any time after this call.
- void MergeDictionary(const DictionaryValue* dictionary);
-
- // Swaps contents with the |other| dictionary.
- virtual void Swap(DictionaryValue* other);
-
- // This class provides an iterator over both keys and values in the
- // dictionary. It can't be used to modify the dictionary.
- class BASE_EXPORT Iterator {
- public:
- explicit Iterator(const DictionaryValue& target);
- ~Iterator();
-
- bool IsAtEnd() const { return it_ == target_.dictionary_.end(); }
- void Advance() { ++it_; }
-
- const std::string& key() const { return it_->first; }
- const Value& value() const { return *it_->second; }
-
- private:
- const DictionaryValue& target_;
- ValueMap::const_iterator it_;
- };
-
- // Overridden from Value:
- DictionaryValue* DeepCopy() const override;
- // Preferred version of DeepCopy. TODO(estade): remove the above.
- scoped_ptr<DictionaryValue> CreateDeepCopy() const;
- bool Equals(const Value* other) const override;
-
- private:
- ValueMap dictionary_;
-
- DISALLOW_COPY_AND_ASSIGN(DictionaryValue);
-};
-
-// This type of Value represents a list of other Value values.
-class BASE_EXPORT ListValue : public Value {
- public:
- typedef ValueVector::iterator iterator;
- typedef ValueVector::const_iterator const_iterator;
-
- // Returns |value| if it is a list, nullptr otherwise.
- static scoped_ptr<ListValue> From(scoped_ptr<Value> value);
-
- ListValue();
- ~ListValue() override;
-
- // Clears the contents of this ListValue
- void Clear();
-
- // Returns the number of Values in this list.
- size_t GetSize() const { return list_.size(); }
-
- // Returns whether the list is empty.
- bool empty() const { return list_.empty(); }
-
- // Sets the list item at the given index to be the Value specified by
- // the value given. If the index beyond the current end of the list, null
- // Values will be used to pad out the list.
- // Returns true if successful, or false if the index was negative or
- // the value is a null pointer.
- bool Set(size_t index, Value* in_value);
- // Preferred version of the above. TODO(estade): remove the above.
- bool Set(size_t index, scoped_ptr<Value> in_value);
-
- // Gets the Value at the given index. Modifies |out_value| (and returns true)
- // only if the index falls within the current list range.
- // Note that the list always owns the Value passed out via |out_value|.
- // |out_value| is optional and will only be set if non-NULL.
- bool Get(size_t index, const Value** out_value) const;
- bool Get(size_t index, Value** out_value);
-
- // Convenience forms of Get(). Modifies |out_value| (and returns true)
- // only if the index is valid and the Value at that index can be returned
- // in the specified form.
- // |out_value| is optional and will only be set if non-NULL.
- bool GetBoolean(size_t index, bool* out_value) const;
- bool GetInteger(size_t index, int* out_value) const;
- // Values of both type TYPE_INTEGER and TYPE_DOUBLE can be obtained as
- // doubles.
- bool GetDouble(size_t index, double* out_value) const;
- bool GetString(size_t index, std::string* out_value) const;
- bool GetString(size_t index, string16* out_value) const;
- bool GetBinary(size_t index, const BinaryValue** out_value) const;
- bool GetBinary(size_t index, BinaryValue** out_value);
- bool GetDictionary(size_t index, const DictionaryValue** out_value) const;
- bool GetDictionary(size_t index, DictionaryValue** out_value);
- bool GetList(size_t index, const ListValue** out_value) const;
- bool GetList(size_t index, ListValue** out_value);
-
- // Removes the Value with the specified index from this list.
- // If |out_value| is non-NULL, the removed Value AND ITS OWNERSHIP will be
- // passed out via |out_value|. If |out_value| is NULL, the removed value will
- // be deleted. This method returns true if |index| is valid; otherwise
- // it will return false and the ListValue object will be unchanged.
- virtual bool Remove(size_t index, scoped_ptr<Value>* out_value);
-
- // Removes the first instance of |value| found in the list, if any, and
- // deletes it. |index| is the location where |value| was found. Returns false
- // if not found.
- bool Remove(const Value& value, size_t* index);
-
- // Removes the element at |iter|. If |out_value| is NULL, the value will be
- // deleted, otherwise ownership of the value is passed back to the caller.
- // Returns an iterator pointing to the location of the element that
- // followed the erased element.
- iterator Erase(iterator iter, scoped_ptr<Value>* out_value);
-
- // Appends a Value to the end of the list.
- void Append(scoped_ptr<Value> in_value);
- // Deprecated version of the above. TODO(estade): remove.
- void Append(Value* in_value);
-
- // Convenience forms of Append.
- void AppendBoolean(bool in_value);
- void AppendInteger(int in_value);
- void AppendDouble(double in_value);
- void AppendString(const std::string& in_value);
- void AppendString(const string16& in_value);
- void AppendStrings(const std::vector<std::string>& in_values);
- void AppendStrings(const std::vector<string16>& in_values);
-
- // Appends a Value if it's not already present. Takes ownership of the
- // |in_value|. Returns true if successful, or false if the value was already
- // present. If the value was already present the |in_value| is deleted.
- bool AppendIfNotPresent(Value* in_value);
-
- // Insert a Value at index.
- // Returns true if successful, or false if the index was out of range.
- bool Insert(size_t index, Value* in_value);
-
- // Searches for the first instance of |value| in the list using the Equals
- // method of the Value type.
- // Returns a const_iterator to the found item or to end() if none exists.
- const_iterator Find(const Value& value) const;
-
- // Swaps contents with the |other| list.
- virtual void Swap(ListValue* other);
-
- // Iteration.
- iterator begin() { return list_.begin(); }
- iterator end() { return list_.end(); }
-
- const_iterator begin() const { return list_.begin(); }
- const_iterator end() const { return list_.end(); }
-
- // Overridden from Value:
- bool GetAsList(ListValue** out_value) override;
- bool GetAsList(const ListValue** out_value) const override;
- ListValue* DeepCopy() const override;
- bool Equals(const Value* other) const override;
-
- // Preferred version of DeepCopy. TODO(estade): remove DeepCopy.
- scoped_ptr<ListValue> CreateDeepCopy() const;
-
- private:
- ValueVector list_;
-
- DISALLOW_COPY_AND_ASSIGN(ListValue);
-};
-
-// This interface is implemented by classes that know how to serialize
-// Value objects.
-class BASE_EXPORT ValueSerializer {
- public:
- virtual ~ValueSerializer();
-
- virtual bool Serialize(const Value& root) = 0;
-};
-
-// This interface is implemented by classes that know how to deserialize Value
-// objects.
-class BASE_EXPORT ValueDeserializer {
- public:
- virtual ~ValueDeserializer();
-
- // This method deserializes the subclass-specific format into a Value object.
- // If the return value is non-NULL, the caller takes ownership of returned
- // Value. If the return value is NULL, and if error_code is non-NULL,
- // error_code will be set with the underlying error.
- // If |error_message| is non-null, it will be filled in with a formatted
- // error message including the location of the error if appropriate.
- virtual scoped_ptr<Value> Deserialize(int* error_code,
- std::string* error_str) = 0;
-};
-
-// Stream operator so Values can be used in assertion statements. In order that
-// gtest uses this operator to print readable output on test failures, we must
-// override each specific type. Otherwise, the default template implementation
-// is preferred over an upcast.
-BASE_EXPORT std::ostream& operator<<(std::ostream& out, const Value& value);
-
-BASE_EXPORT inline std::ostream& operator<<(std::ostream& out,
- const FundamentalValue& value) {
- return out << static_cast<const Value&>(value);
-}
-
-BASE_EXPORT inline std::ostream& operator<<(std::ostream& out,
- const StringValue& value) {
- return out << static_cast<const Value&>(value);
-}
-
-BASE_EXPORT inline std::ostream& operator<<(std::ostream& out,
- const DictionaryValue& value) {
- return out << static_cast<const Value&>(value);
-}
-
-BASE_EXPORT inline std::ostream& operator<<(std::ostream& out,
- const ListValue& value) {
- return out << static_cast<const Value&>(value);
-}
-
-} // namespace base
-
-#endif // BASE_VALUES_H_