LibreDWG / libredwg

Official mirror of libredwg. With CI hooks and nightly releases. PR's ok
https://savannah.gnu.org/projects/libredwg/
GNU General Public License v3.0
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LibreDWG - free implementation of the DWG file format

LibreDWG is a free C library to read and write DWG files. This program is part of the GNU project, released under the aegis of GNU. It is licensed under the terms of the GNU General Public License version 3 (or at you option any later version).

DWG is a file format created in the 70's for the emerging CAD applications. Currently it is the native file format of AutoCAD, a proprietary CAD program developed by AutoDesk.

LibreDWG is a fork from LibDWG due to its usage of Esperanto, which we think is not the best strategy for a free software project which aims to get lots of contributors. LibreDWG is written in English. At the moment our decoder (i.e. reader) is done, it can read all DWG versions, just some very advanced R2010+ objects fail to read and are skipped over. The writer is good enough for R1.4 - R2000. Among the example applications we wrote using LibreDWG is a reader, a writer, a rewriter (i.e. saveas), an initial SVG and Postscript conversion, dxf and json converters, dwggrep to search for text, and dwglayer to print the list of layers. More are in the pipeline. Please contact us if you want to help.

The strings API is UTF-8 (WTF8 really, Windows UCS-2 has no surrogate pairs), and encodes to the internal 8-bit or UCS-2 strings, depending on the DWG version. Older DWG's are encoded in ~30 codepages, which we convert to unicode/UTF-8.

We also maintain a diff document for our internal fixed ODA-5.4.1 spec at doc/ODA-5.4.2-libredwg-diff.pdf

For contact file a ticket or email the package maintainers:

Reini Urban

The now inactive founders and previous maintainers were:

Felipe Corrêa da Silva Sanches Rodrigo Rodrigues da Silva Hardeep Singh Rai

If you are looking for general information about the project, check our website: http://www.gnu.org/software/libredwg/

== Building and installing the library ==

You need the following dependencies:

Optionally:

See INSTALL for generic instructions. Basically, you do:

$ sh ./autogen.sh (if you checked out the source code from git) $ ./configure [--enable-trace] [--disable-write] [--disable-shared] $ make $ make check $ sudo make install

This builds and installs various files in the "installation dirs": $libdir ($exec_prefix/lib) -- library files (libredwg.*) $includedir ($prefix/include) -- dwg.h dwg_api.h $libdir/pkgconfig -- libredwg.pc $infodir ($datarootdir/info) -- LibreDWG.info

Use "./configure --help" to see a full list of options you can use to customize the installation dirs. Other options recognized by configure are:

--enable-release

Recommended for packagers and fuzzers. Disables all features
which will not be enabled in official tarball releases. Like skipping
unstable DWG features or objects, unknown DWG versions and objects.

--enable-trace

Enable runtime tracing (default: no).  When enabled, the environment
variable LIBREDWG_TRACE is consulted on the first decode/encode attempt.
Its value is an integer: 0 (no output) through 9 (full verbosity).
Most tools do support a --verbosity|-v flag instead.

--with-dxf-precision=rfc

How many after-comma places in DXF doubles. 6 is the recommended value (e.g. use rfc), max and the default is 16.

--with-geojson-precision=rfc

How many after-comma places in GeoJSON doubles. 6 is the recommended value by RFC 7946, max and the default is 16.

--disable-write

Disable DWG write support (default: no).
Write support only works for earlier versions until r2004. Rewriting most DWG's
<= r2004 usually works fine.

--disable-bindings

Disable SWIG bindings for python and perl5.

--disable-dxf

Disables all in and out modules: DXF, DXFB, JSON, GeoJSON.

--disable-json

Disables the json in and out modules: JSON, GeoJSON.

--disable-python

Disable python bindings and tests.
Related: --enable-python=python3.6
Enforce a specific version.

--enable-debug

Activates support for unstable classes. For testing only.

--enable-gcov

Activates support for GNU gcov, test coverage reporting.

--with-perl-install=vendor

Where to install the perl bindings: vendor,arch,yes,no,site. Default is perl-install=site

== Windows ==

See the following scripts how we build on Windows:

We do support mingw, clang-cl and now also Visual Studio 2019 via cmake. stdint.h and inttypes.h must be available. Pre-compiled Windows binaries are here: https://github.com/LibreDWG/libredwg/releases

== Example usage of the library ==

The programs and examples directories contains some application code that uses our lib:

Copyright (C) 2009, 2010, 2015, 2018-2024 Free Software Foundation, Inc.

This library is free software, licensed under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.