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#ifndef RBIMPL_INTERN_MARSHAL_H /*-*-C++-*-vi:se ft=cpp:*/
#define RBIMPL_INTERN_MARSHAL_H
/**
* @file
* @author Ruby developers <ruby-core@ruby-lang.org>
* @copyright This file is a part of the programming language Ruby.
* Permission is hereby granted, to either redistribute and/or
* modify this file, provided that the conditions mentioned in the
* file COPYING are met. Consult the file for details.
* @warning Symbols prefixed with either `RBIMPL` or `rbimpl` are
* implementation details. Don't take them as canon. They could
* rapidly appear then vanish. The name (path) of this header file
* is also an implementation detail. Do not expect it to persist
* at the place it is now. Developers are free to move it anywhere
* anytime at will.
* @note To ruby-core: remember that this header can be possibly
* recursively included from extension libraries written in C++.
* Do not expect for instance `__VA_ARGS__` is always available.
* We assume C99 for ruby itself but we don't assume languages of
* extension libraries. They could be written in C++98.
* @brief Public APIs related to rb_mMarshal.
*/
#include "ruby/internal/dllexport.h"
#include "ruby/internal/value.h"
RBIMPL_SYMBOL_EXPORT_BEGIN()
/* marshal.c */
/**
* Serialises the given object and all its referring objects, to write them
* down to the passed port.
*
* @param[in] obj Target object to dump.
* @param[out] port IO-like destination buffer.
* @exception rb_eTypeError `obj` cannot be dumped for some reason.
* @exception rb_eRuntimeError `obj` was tampered during dumping.
* @exception rb_eArgError Traversal too deep.
* @return The passed `port` as-is.
* @post Serialised representation of `obj` is written to `port`.
* @note `port` is basically an IO but StringIO is also possible.
*/
VALUE rb_marshal_dump(VALUE obj, VALUE port);
/**
* Deserialises a previous output of rb_marshal_dump() into a network of
* objects.
*
* @param[in,out] port Either IO or String.
* @exception rb_eTypeError `port` is in unexpected type.
* @exception rb_eArgError Contents of `port` is broken.
* @return Object(s) rebuilt using the info from `port`.
*
* SECURITY CONSIDERATIONS
* ========================
*
* @warning By design, rb_marshal_load() can deserialise almost any
* class loaded into the Ruby process. In many cases this can
* lead to remote code execution if the Marshal data is loaded
* from an untrusted source.
* @warning As a result, rb_marshal_load() is not suitable as a general
* purpose serialisation format and you should never unmarshal
* user supplied input or other untrusted data.
* @warning If you need to deserialise untrusted data, use JSON or
* another serialisation format that is only able to load
* simple, 'primitive' types such as String, Array, Hash, etc.
* Never allow user input to specify arbitrary types to
* deserialise into.
*/
VALUE rb_marshal_load(VALUE port);
/**
* Marshal format compatibility layer. Over time, classes evolve, so that
* their internal data structure change drastically. For instance an instance
* of ::rb_cRange was made of ::RUBY_T_OBJECT in 1.x., but in 3.x it is a
* ::RUBY_T_STRUCT now. In order to keep binary compatibility, we "fake" the
* marshalled representation to stick to old types. This is the API to enable
* that manoeuvre. Here is how:
*
* First, because you are going to keep backwards compatibility, you need to
* retain the old implementation of your class. Rename it, and keep the class
* somewhere (for instance rb_register_global_address() could help). Next
* create your new class. Do whatever you want.
*
* Then, this is the key point. Create two new "bridge" functions that convert
* the structs back and forth:
*
* - the "dumper" function that takes an instance of the new class, and
* returns an instance of the old one. This is called from
* rb_marshal_dump(), to keep it possible for old programs to read your new
* data.
*
* - the "loader" function that takes two arguments, new one and old one, in
* that order. rb_marshal_load() calls this function when it finds a
* representation of the retained old class. The old one passed to this
* function is the reconstructed instance of the old class.
* Reverse-engineer that to modify the new one, to have the identical
* contents.
*
* Finally, connect all of them using this function.
*
* @param[in] newclass The class that needs conversion.
* @param[in] oldclass Old implementation of `newclass`.
* @param[in] dumper Function that converts `newclass` to `oldclass`.
* @param[in] loader Function that converts `oldclass` to `newclass`.
* @exception rb_eTypeError `newclass` has no allocator.
*/
void rb_marshal_define_compat(VALUE newclass, VALUE oldclass, VALUE (*dumper)(VALUE), VALUE (*loader)(VALUE, VALUE));
RBIMPL_SYMBOL_EXPORT_END()
#endif /* RBIMPL_INTERN_MARSHAL_H */
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