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Prepare release notes for 10.6 (so far)
This commit is contained in:
Jay Berkenbilt
parent
c95f02115c
commit
eb481eb698
10
ChangeLog
10
ChangeLog
@ -68,7 +68,7 @@
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object.
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* A light C API around basic QPDFJob functionality is in
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include/qpdf/qpdf-job-c.h.p
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include/qpdf/qpdfjob-c.h.p
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* Add new functions version of QUtil::call_main_from_wmain that
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takes a constant argv array.
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@ -79,10 +79,10 @@
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description to --help and the manual.
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* The --json flag now takes a version number as an optional
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parameter. The default will remain version 1 for compatibility.
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This enables future code to use --json=latest to always get the
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latest version or to use a specific version. At this time, there's
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only version 1, but a version 2 may appear in a future qpdf.
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parameter. The default will remain version 1 for compatibility
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until the release of qpdf 11, after which it will become "latest".
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At this time, there's only version 1, but a version 2 may appear
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in a future qpdf.
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2022-01-28 Jay Berkenbilt <ejb@ql.org>
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12
TODO
12
TODO
@ -9,15 +9,6 @@
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make qpdf more contributor-friendly. Look
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https://bestpractices.coreinfrastructure.org/en
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* Remember for release notes: starting in qpdf 11, the default value
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for the --json keyword will be "latest". If you are depending on
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version 1, change your code to specify --json=1, which works
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starting with 10.6.0.
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* Write up something about preparing for the PointerHolder to
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shared_ptr migration. Clearly document the deprecations and how to
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deal with them.
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Output JSON v2
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==============
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@ -332,6 +323,9 @@ Other notes:
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PointerHolder to std::shared_ptr
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================================
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Remember to update the smart-pointers section of the manual in
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design.rst.
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Once all deprecation warnings are cleared up (changing getPointer() to
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get() and getRefcount() to use_count()), the only real issues are that
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implicit assignment of a pointer to a shared_ptr doesn't work while it
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@ -74,6 +74,7 @@
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"cxxflags",
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"cygwin",
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"dctdecode",
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"decltype",
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"decrypter",
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"deduplicating",
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"deps",
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2
job.sums
2
job.sums
@ -14,4 +14,4 @@ libqpdf/qpdf/auto_job_json_decl.hh c5e3fd38a3b0c569eb0c6b4c60953a09cd6bc7d3361a3
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libqpdf/qpdf/auto_job_json_init.hh b070350d304d137ba594c1ba40b373137e8459735f04b8ca0f8a2ffd1908c69e
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libqpdf/qpdf/auto_job_schema.hh 18a3780671d95224cb9a27dcac627c421cae509d59f33a63e6bda0ab53cce923
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manual/_ext/qpdf.py e9ac9d6c70642a3d29281ee5ad92ae2422dee8be9306fb8a0bc9dba0ed5e28f3
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manual/cli.rst 3746df6c4f115387cca0d921f25619a6b8407fc10b0e4c9dcf40b0b1656c6f8a
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manual/cli.rst 2dd5e5a9c0440aea65ed0a2bf6239aa6662afdb463224aafdc116a8a676dbc20
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@ -3154,7 +3154,10 @@ Related Options
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supported value is ``1``, but it's possible that a new JSON output
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version will be added in a future version. You can also specify
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``latest`` to use the latest JSON version. For backward
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compatibility, the default value is ``1``. Use the
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compatibility, the default value will remain ``1`` until qpdf
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version 11, after which point it will become ``latest``. In all
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case, you can tell what version of the JSON output you have from
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the ``"version"`` key in the output. Use the
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:qpdf:ref:`--json-help` option to get a description of the JSON
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object.
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@ -745,3 +745,221 @@ C API object handle methods returned error codes like the other methods
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and set return values in passed-in pointers, but this would complicate
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both the implementation and the use of the library for a case that is
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actually quite rare and largely avoidable.
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.. _smart-pointers:
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Smart Pointers
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--------------
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This section describes changes to the use of smart pointers in qpdf in
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versions 10.6.0 and 11.0.0.
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Starting in qpdf 11, ``PointerHolder`` will be replaced with
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``std::shared_ptr`` in qpdf's public API. A backward-compatible
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``PointerHolder`` will be provided that should make it possible for
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most code to remain unchanged. This new ``PointerHolder`` will be
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marked deprecated but will provide a way to suppress the deprecation
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warnings. Code that works with containers of ``PointerHolder`` may
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have to be modified, though no qpdf interfaces do this.
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The remainder of this section describes how to prepare if you want to
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eliminate ``PointerHolder`` from your code or what to do if you want
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to stick with the old interfaces.
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Changes in 10.6.0
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~~~~~~~~~~~~~~~~~
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In qpdf 10.6.0, two ``PointerHolder`` methods have been deprecated and
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replaced with methods that are compatible with ``std::shared_ptr``:
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- ``getPointer()`` -- use ``get()`` instead
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- ``getRefcount()`` -- use ``use_count()`` instead
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If you build your code with deprecation warnings enabled and you want
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to suppress these deprecation warnings for now, you can ``#define
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NO_POINTERHOLDER_DEPRECATION`` before including any qpdf header files.
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It may be possible to leave it this way long-term to facilitate
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supporting older versions of qpdf without conditional compilation.
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``PointerHolder`` has had a long-standing bug: a ``const
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PointerHolder<T>`` would only provide a ``T const*`` with its
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``getPointer`` method. This is incorrect and is now how standard C++
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smart pointers or regular pointers behave. The correct semantics
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would be that a ``const PointerHolder<T>`` would not accept a new
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pointer after being created but would still allow you to modify the
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item being pointed to. If you don't want to mutate the thing it points
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to, use ``PointerHolder<T const>`` instead. The new ``get()`` method
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behaves correctly. It is therefore not exactly the same as
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``getPointer()``, but it does behave the way ``get()`` behaves with
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``std::shared_ptr``. This shouldn't make any difference to any
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correctly written code.
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How to Prepare
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~~~~~~~~~~~~~~
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If you don't need to support versions of qpdf prior to 10.6, you can
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just replace all occurrences of ``getPointer()`` with ``get()`` and
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all occurrences of ``getRefcount()`` with ``use_count()``. That's
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about all you will be able to do prior to qpdf 11.
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If you need to support older versions, you have two choices:
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- ``#define NO_POINTERHOLDER_DEPRECATION`` and leave everything the
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way it was. You can just wait until qpdf 11.
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- Write code that uses ``get()`` but falls back to ``getPointer()`` if
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``QPDF_MAJOR_VERSION`` is not defined. The symbols
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``QPDF_MAJOR_VERSION``, ``QPDF_MINOR_VERSION``, and
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``QPDF_PATCH_VERSION`` were introduced with 10.6.0, so just checking
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for whether ``QPDF_MAJOR_VERSION`` is defined is sufficient for
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telling if you're running a version before 10.6.0. If you do this,
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once qpdf 11 comes out, you will already know all the places that
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have to be handled specially.
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If you are somehow relying on the fact that a ``const
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PointerHolder<T>`` always gave back a ``T const*`` and are
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dereferencing a ``const PointerHolder<T>`` to call methods that only
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have ``const`` versions in ``T``, you may have to change from
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``const PointerHolder<T>`` to ``PointerHolder<T const>``. This won't
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be an issue for anything in the qpdf API, and if you are using qpdf
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``PointerHolder`` objects for any other reason, you should just
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replace them with ``std::shared_ptr``.
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What to Expect
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~~~~~~~~~~~~~~
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Note: if you are reading this in the 10.6 manual and 11 is out, you
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should read it in the manual for qpdf 11 instead. Some early tests
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have been done to try to ensure the accuracy of this information, but
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it may change once the work is actually completed.
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When ``PointerHolder`` disappears from qpdf's API in qpdf 11, you will
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have a few options:
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- Use the new ``PointerHolder``, which is derived from
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``std::shared_ptr`` and which has methods to make it
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interchangeable. For things that use ``PointerHolder<T>`` directly,
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this should "just work," though you will have to ``#define
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NO_POINTERHOLDER_DEPRECATION`` if you don't want deprecation
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warnings.
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- Replace all uses of ``PointerHolder<T>`` with ``std::shared_ptr<T>``
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and deal with the required changes, outlined below. This is the
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recommended course of action. You will need conditional compilation
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if you want to simultaneously support order code. Stay tuned for the
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qpdf 11 documentation for specifics.
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While ``PointerHolder<T>`` and ``std::shared_ptr<T>`` will be mutually
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assignable and convertible, this does not apply to containers of those
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objects. The qpdf API doesn't have any containers of
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``PointerHolder``, so this would have to be in your own code. You can
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prepare yourself for the change by using ``auto`` and ``decltype``
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whenever possible so that a change to the underlying type of something
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won't require source changes.
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Required Changes in qpdf 11
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~~~~~~~~~~~~~~~~~~~~~~~~~~~
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This section describes unavoidable changes when replacing
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``PointerHolder`` with ``std::shared_ptr`` rather than continuing to
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use the backward compatible API. Nothing here is needed (or can be
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done) prior to qpdf 11, so consider this to be a preview.
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- Change ``getPointer`` to ``get`` and ``getRefcount`` to
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``use_count`` as above. If your starting point is no deprecation
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warnings with qpdf 10.6, this will already be true.
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- Array allocations will have to be rewritten.
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To allocate a ``PointerHolder`` to an array:
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.. code-block:: c++
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PointerHolder<X> p(true, new X[n]);
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To allocate a ``std::shared_ptr`` to an array:
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.. code-block:: c++
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auto p = std::shared_ptr<X>(new X[n], std::default_delete<X[]>());
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To allocate a ``std::unique_ptr`` to an array:
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.. code-block:: c++
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auto p = std::make_unique<X[]>(n);
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// or
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auto p = std::unique_ptr<X[]>(new X[n]);
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The second form may be needed if ``X`` has a private constructor
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from this context.
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C++-17 has a better way to allocate ``std::shared_ptr`` to an array,
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but qpdf is still allowing C++-14 to be used. You can use whatever
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method to handle shared arrays that is supported in your
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environment. There are no shared arrays in qpdf's public API except
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for some ``QUtil`` helper methods that are not essential for use of
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qpdf features.
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- ``PointerHolder<T>`` can have plain pointers directly assigned to
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it, while ``std::shared_ptr<T>`` cannot. This makes code like this
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possible:
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.. code-block:: c++
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PointerHolder<X> x_p;
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X* x = new X();
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x_p = x;
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It also makes it possible to pass a plain pointer to a function
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expecting a ``PointerHolder``, thereby transferring "ownership" of
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the pointer into the function.
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Code like that is a risky because you can leak memory if an
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exception is thrown between creation of the X and assignment of it
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into the ``PointerHolder``. In any case, ``std::shared_ptr`` does
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not allow that, so you need one of these instead:
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.. code-block:: c++
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auto x_p = std::make_shared<X>();
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X* x = x_p.get();
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// or, less safe, but closer:
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std::shared_ptr<X> x_p;
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X* x = new X();
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x_p = std::shared_ptr<X>(x);
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Also, code like this:
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.. code-block:: c++
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PointerHolder<Base> base_p;
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Derived* derived = new Derived();
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base_p = derived;
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needs to be replaced with something like this instead:
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.. code-block:: c++
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std::shared_ptr<Base> base_p;
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Derived* derived = new Derived();
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base_p = std::shared_ptr<Base>(derived);
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Historical Background
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~~~~~~~~~~~~~~~~~~~~~
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Since its inception, the qpdf library used its own smart pointer
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class, ``PointerHolder``. The ``PointerHolder`` class was originally
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created long before ``std::shared_ptr`` existed, and qpdf itself
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didn't start requiring a C++-11 compiler version 9.1.0 released in
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late 2019.
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``PointerHolder`` is a reference-counted smart pointer with semantics
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almost identical to ``std::shared_ptr`` except that it is not
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thread-safe. It has a few interface differences that prevent
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``std::shared_ptr`` from being a drop-in replacement. However, given
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the value of using standard library smart pointers, qpdf is taking the
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plunge for version 11 and switching over to standard library smart
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pointers.
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@ -14,7 +14,10 @@ executable is available from inside the C++ library using the
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- Use from the C++ API with ``QPDFJob::initializeFromArgv``
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- Use from the C API with ``qpdfjob_run_from_argv`` from :file:`qpdfjob-c.h`
|
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- Use from the C API with ``qpdfjob_run_from_argv`` from
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:file:`qpdfjob-c.h`. If you are calling from a Windows-style main
|
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and have an argv array of ``wchar_t``, you can use
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``qpdfjob_run_from_wide_argv``.
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- The job JSON file format
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@ -135,6 +138,13 @@ C++ code:
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return 0;
|
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}
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Note the ``QPDFUsage`` exception above. This is thrown whenever a
|
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configuration error occurs. These exactly correspond to usage messages
|
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issued by the :command:`qpdf` CLI for things like omitting an output
|
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file, specifying `--pages` multiple times, or other invalid
|
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combinations of options. ``QPDFUsage`` is thrown by the argv and JSON
|
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interfaces as well as the native ``QPDFJob`` interface.
|
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|
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It is also possible to mix and match command-line options and JSON
|
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from the CLI. For example, you could create a file called
|
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:file:`my-options.json` containing the following:
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@ -6,6 +6,187 @@ Release Notes
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For a detailed list of changes, please see the file
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:file:`ChangeLog` in the source distribution.
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10.6.0: XXX
|
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- Deprecations/future replacement of ``PointerHolder``
|
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|
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The next major release of qpdf will replace ``PointerHolder`` with
|
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``std::shared_ptr`` across all of qpdf's public API. In
|
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preparation for this change, the following ``PointerHolder``
|
||||
methods have been deprecated in favor of interfaces that more
|
||||
closely match ``std::shared_ptr``:
|
||||
|
||||
- ``getPointer()`` -- use ``get()`` instead; this also fixes
|
||||
``const`` semantics as discussed in
|
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:file:`include/qpdf/PointerHolder.hh`.
|
||||
|
||||
- ``getRefcount()`` -- use ``use_count()`` instead
|
||||
|
||||
If you build your code with deprecation warnings enabled and you
|
||||
want to suppress these deprecation warnings for now, you can
|
||||
``#define NO_POINTERHOLDER_DEPRECATION`` before including any qpdf
|
||||
header files. Code that does this will *require no changes* prior
|
||||
to qpdf 11 and may or may not require changes after qpdf 11.
|
||||
|
||||
For a detailed discussion of this change and how to prepare for
|
||||
it, see :ref:`smart-pointers`.
|
||||
|
||||
- Preparation for a new JSON output version
|
||||
|
||||
- The :qpdf:ref:`--json` option takes an optional parameter
|
||||
indicating the version of the JSON output. At present, there is
|
||||
only one JSON version (``1``), but there are plans for an
|
||||
updated version in a coming release. Until the release of qpdf
|
||||
11, the default value of ``--json`` is ``1`` for compatibility.
|
||||
Once qpdf 11 is out, the default version will be ``latest``. If
|
||||
you are depending on the exact format of ``--json`` for code,
|
||||
you should start using ``--json=1`` in preparation.
|
||||
|
||||
- New QPDFJob API exposes CLI functionality
|
||||
|
||||
Prior to qpdf 10.6, a lot of the functionality implemented by the
|
||||
qpdf CLI executable was built into the executable itself and not
|
||||
available from the library. qpdf 10.6 introduces a new object,
|
||||
``QPDFJob``, that exposes all of the command-line functionality.
|
||||
This includes a native ``QPDFJob`` API with fluent interfaces that
|
||||
mirror the command-line syntax, a JSON syntax for specifying the
|
||||
equivalent of a command-line invocation, and the ability to run a
|
||||
qpdf "job" by passing a null-terminated array of qpdf command-line
|
||||
options. The command-line argument array and JSON methods of
|
||||
invoking ``QPDFJob`` are also exposed to the C API. For details,
|
||||
see :ref:`qpdf-job`.
|
||||
|
||||
- Other Library Enhancements
|
||||
|
||||
- New ``QPDFObjectHandle`` literal syntax using C++'s user-defined
|
||||
literal syntax. You can use
|
||||
|
||||
.. code-block:: c++
|
||||
|
||||
auto oh = "<</Some (valid) /PDF (object)>>"_qpdf;
|
||||
|
||||
to create a QPDFObjectHandle. It is a shorthand for
|
||||
``QPDFObjectHandle::parse``.
|
||||
|
||||
- Preprocessor symbols ``QPDF_MAJOR_VERSION``,
|
||||
``QPDF_MINOR_VERSION``, and ``QPDF_PATCH_VERSION`` are now
|
||||
available and can be used to make it easier to write code that
|
||||
supports multiple versions of qpdf. You don't have to include
|
||||
any new header files to get these, which makes it possible to
|
||||
write code like this:
|
||||
|
||||
.. code-block:: c++
|
||||
|
||||
#if !defined(QPDF_MAJOR_VERSION) || QPDF_MAJOR_VERSION < 11
|
||||
// do something using qpdf 10 or older API
|
||||
#else
|
||||
// do something using qpdf 11 or newer API
|
||||
#endif
|
||||
|
||||
Since this was introduced only in qpdf version 10.6.0, testing
|
||||
for an undefined value of ``QPDF_MAJOR_VERSION`` is equivalent
|
||||
to detecting a version prior to 10.6.0.
|
||||
|
||||
The symbol ``QPDF_VERSION`` is also defined as a string
|
||||
containing the same version number that is returned by
|
||||
``QPDF::QPDFVersion``. Note that ``QPDF_VERSION`` may differ
|
||||
from ``QPDF::QPDFVersion()`` if your header files and library
|
||||
are out of sync with each other.
|
||||
|
||||
- The method ``QPDF::QPDFVersion`` and corresponding C API call
|
||||
``qpdf_get_qpdf_version`` are now both guaranteed to return a
|
||||
reference (or pointer) to a static string, so you don't have to
|
||||
copy these if you are using them in your software. They have
|
||||
always returned static values. Now the fact that they return
|
||||
static values is part of the API contract and can be safely
|
||||
relied upon.
|
||||
|
||||
- New accessor methods for ``QPDFObjectHandle``. In addition to
|
||||
the traditional ones, such as ``getIntValue``, ``getName``,
|
||||
etc., there are a family of new accessors whose names are of the
|
||||
form ``getValueAsX``. The difference in behavior is as follows:
|
||||
|
||||
- The older accessor methods, which will continue to be
|
||||
supported, return the value of the object if it is the
|
||||
expected type. Otherwise, they return a fallback value and
|
||||
issue a warning.
|
||||
|
||||
- The newer accessor methods return a boolean indicating whether
|
||||
or not the object is of the expected type. If it is, a
|
||||
reference of the correct type is returned.
|
||||
|
||||
In many cases, the new interfaces will enable more compact code
|
||||
and will also never generate type warnings. Thanks to M. Holger
|
||||
for contributing these accessors. Search for ``getValueAs`` in
|
||||
:file:`include/qpdf/QPDFObjectHandle.hh` for a complete list.
|
||||
|
||||
These are also exposed in the C API in functions whose names
|
||||
start with ``qpdf_oh_get_value_as``.
|
||||
|
||||
- New convenience methods in ``QPDFObjectHandle``:
|
||||
``isDictionaryOfType``, ``isStreamOfType``, and
|
||||
``isNameAndEquals`` allow more compact querying of dictionaries.
|
||||
Also added to the C API: ``qpdf_oh_is_dictionary_of_type`` and
|
||||
``qpdf_oh_is_name_and_equals``. Thanks to M. Holger for the
|
||||
contribution.
|
||||
|
||||
- New functions added to ``QUtil``: ``make_shared_cstr`` and
|
||||
``make_unique_cstr`` copy ``std::string`` to
|
||||
``std::shared_ptr<char>`` and ``std::unique_ptr<char[]>``. These
|
||||
are alternatives to the existing ``QUtil::copy_string`` function
|
||||
which offer other ways to get a C string with safer memory
|
||||
management.
|
||||
|
||||
- New function ``QUtil::file_can_be_opened`` tests to see whether
|
||||
a file can actually be opened by attempting to open it and close
|
||||
it again.
|
||||
|
||||
- There is a new version of ``QUtil::call_main_from_wmain`` that
|
||||
takes a ``const`` argv array and calls a main that takes a
|
||||
``const`` argv array.
|
||||
|
||||
- ``QPDF::emptyPDF`` has been exposed to the C API as
|
||||
``qpdf_empty_pdf``. This makes it possible to create PDF from
|
||||
scratch with the C API.
|
||||
|
||||
- New C API functions ``qpdf_oh_get_binary_utf8_value`` and
|
||||
``qpdf_oh_new_binary_unicode_string`` take length parameters,
|
||||
which makes it possible to handle UTF-8-encoded C strings with
|
||||
embedded NUL characters. Thanks to M. Holger for the
|
||||
contribution.
|
||||
|
||||
- The ``JSON`` object in the qpdf library has been enhanced to
|
||||
include a parser and the ability to get values out of the
|
||||
``JSON`` object. Previously it was a write-only interface. Even
|
||||
so, qpdf's ``JSON`` object is not intended to be a
|
||||
general-purpose JSON implementation as discussed in
|
||||
:file:`include/qpdf/JSON.hh`.
|
||||
|
||||
- The ``JSON`` object's "schema" checking functionality now allows
|
||||
for optional keys. Note that this "schema" functionality doesn't
|
||||
conform to any type of standard. It's just there to help with
|
||||
error reporting with qpdf's own JSON support.
|
||||
|
||||
- Documentation Enhancements
|
||||
|
||||
- Documentation for the command-line tool has been completely
|
||||
rewritten. This includes a top-to-bottom rewrite of :ref:`using`
|
||||
in the manual. Command-line arguments are now indexed, and
|
||||
internal links can appear to them within the documentation.
|
||||
|
||||
- The output of ``qpdf --help`` is generated from the manual and
|
||||
is divided into help topics that parallel the sections of the
|
||||
manual. When you run ``qpdf --help``, instead of getting a Great
|
||||
Wall of Text, you are given basic usage information and a list
|
||||
of help topics. It is possible to request help for any
|
||||
individual topic or any specific command-line option, or you can
|
||||
get a dump of all available help text. The manual continues to
|
||||
contain a greater level of detail and more examples.
|
||||
|
||||
- Bug Fixes
|
||||
|
||||
- Some characters were not correctly translated from PDF doc
|
||||
encoding to Unicode.
|
||||
|
||||
10.5.0: December 21, 2021
|
||||
- Packaging changes
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user