When using Debian or Ubuntu based Linux distro, run "make package" to create the .deb installation file.

• [X] Checked coding style
• [X] Accept to license the code under the terms of the LGPL 2.1
• [X] Added attribution in AUTHORS.md

Hi everyone!

pdfmm looks a very interesting project! thanks for working on that!

as I mentioned in a previous issue, I am packaging pdfmm on conda-forge. Using that package I am not able to build the example at https://github.com/pdfmm/pdfmm/blob/v0.9.22/examples/helloworld/helloworld.cpp

This is the error that is rasing here::

bash ./scripts/optclean.sh
mkdir -p build
set -ex
meson setup \
	--prefix /home/xmn/mambaforge/envs/poc-pdfmm \
	--libdir /home/xmn/mambaforge/envs/poc-pdfmm/lib \
	--includedir /home/xmn/mambaforge/envs/poc-pdfmm/include \
	--includedir /home/xmn/mambaforge/envs/poc-pdfmm/include/pdfmm \
	--buildtype=release \
	--native-file meson.native  \
	build .
meson compile -C build
The Meson build system
Version: 0.63.2
Source dir: /mnt/sda1/storage/dev/inlyse-projects/poc-pdfmm
Build dir: /mnt/sda1/storage/dev/inlyse-projects/poc-pdfmm/build
Build type: native build
Project name: pocpdfmm
Project version: 1.0.0
C compiler for the host machine: /home/xmn/mambaforge/envs/poc-pdfmm/bin/x86_64-conda-linux-gnu-cc (gcc 10.4.0 "x86_64-conda-linux-gnu-cc (conda-forge gcc 10.4.0-16) 10.4.0")
C linker for the host machine: /home/xmn/mambaforge/envs/poc-pdfmm/bin/x86_64-conda-linux-gnu-cc ld.lld 14.0.4
C++ compiler for the host machine: /home/xmn/mambaforge/envs/poc-pdfmm/bin/x86_64-conda-linux-gnu-c++ (gcc 10.4.0 "x86_64-conda-linux-gnu-c++ (conda-forge gcc 10.4.0-16) 10.4.0")
C++ linker for the host machine: /home/xmn/mambaforge/envs/poc-pdfmm/bin/x86_64-conda-linux-gnu-c++ ld.lld 14.0.4
Host machine cpu family: x86_64
Host machine cpu: x86_64
Found pkg-config: /home/xmn/mambaforge/envs/poc-pdfmm/bin/pkg-config (0.29.2)
Run-time dependency cli11 found: YES 2.2.0
Found CMake: /home/xmn/mambaforge/envs/poc-pdfmm/bin/cmake (3.24.2)
Run-time dependency glog found: YES 0.6.0
WARNING: You should add the boolean check kwarg to the run_command call.
         It currently defaults to false,
         but it will default to true in future releases of meson.
         See also: https://github.com/mesonbuild/meson/issues/9300
Dependency gtest skipped: feature dev disabled
Dependency gmock skipped: feature dev disabled
Program clang-tidy skipped: feature dev disabled
Build targets in project: 3

pocpdfmm 1.0.0

  User defined options
    Native files: meson.native
    buildtype   : release
    includedir  : /home/xmn/mambaforge/envs/poc-pdfmm/include/pdfmm
    libdir      : /home/xmn/mambaforge/envs/poc-pdfmm/lib
    prefix      : /home/xmn/mambaforge/envs/poc-pdfmm

Found ninja-1.11.0 at /home/xmn/mambaforge/envs/poc-pdfmm/bin/ninja
ninja: Entering directory `/mnt/sda1/storage/dev/inlyse-projects/poc-pdfmm/build'
[0/1] Regenerating build files.
Cleaning... 0 files.
The Meson build system
Version: 0.63.2
Source dir: /mnt/sda1/storage/dev/inlyse-projects/poc-pdfmm
Build dir: /mnt/sda1/storage/dev/inlyse-projects/poc-pdfmm/build
Build type: native build
Project name: pocpdfmm
Project version: 1.0.0
C compiler for the host machine: /home/xmn/mambaforge/envs/poc-pdfmm/bin/x86_64-conda-linux-gnu-cc (gcc 10.4.0 "x86_64-conda-linux-gnu-cc (conda-forge gcc 10.4.0-16) 10.4.0")
C linker for the host machine: /home/xmn/mambaforge/envs/poc-pdfmm/bin/x86_64-conda-linux-gnu-cc ld.lld 14.0.4
C++ compiler for the host machine: /home/xmn/mambaforge/envs/poc-pdfmm/bin/x86_64-conda-linux-gnu-c++ (gcc 10.4.0 "x86_64-conda-linux-gnu-c++ (conda-forge gcc 10.4.0-16) 10.4.0")
C++ linker for the host machine: /home/xmn/mambaforge/envs/poc-pdfmm/bin/x86_64-conda-linux-gnu-c++ ld.lld 14.0.4
Host machine cpu family: x86_64
Host machine cpu: x86_64
Dependency CLI11 found: YES 2.2.0 (cached)
Dependency glog found: YES 0.6.0 (cached)
WARNING: You should add the boolean check kwarg to the run_command call.
         It currently defaults to false,
         but it will default to true in future releases of meson.
         See also: https://github.com/mesonbuild/meson/issues/9300
Dependency gtest skipped: feature dev disabled
Dependency gmock skipped: feature dev disabled
Program clang-tidy skipped: feature dev disabled
Build targets in project: 3

pocpdfmm 1.0.0

  User defined options
    Native files: /mnt/sda1/storage/dev/inlyse-projects/poc-pdfmm/meson.native
    backend     : ninja
    buildtype   : release
    includedir  : /home/xmn/mambaforge/envs/poc-pdfmm/include/pdfmm
    libdir      : /home/xmn/mambaforge/envs/poc-pdfmm/lib
    prefix      : /home/xmn/mambaforge/envs/poc-pdfmm

Found ninja-1.11.0 at /home/xmn/mambaforge/envs/poc-pdfmm/bin/ninja
[1/6] Linking static target liblibpdfmm.so.a
[2/6] Compiling C++ object libpoc-pdfmm-lib.so.p/_mnt_sda1_storage_dev_inlyse-projects_poc-pdfmm_poc-pdfmm_src_example.cpp.o
[3/6] Linking target libpoc-pdfmm-lib.so
FAILED: libpoc-pdfmm-lib.so 
/home/xmn/mambaforge/envs/poc-pdfmm/bin/x86_64-conda-linux-gnu-c++  -o libpoc-pdfmm-lib.so libpoc-pdfmm-lib.so.p/_mnt_sda1_storage_dev_inlyse-projects_poc-pdfmm_poc-pdfmm_src_example.cpp.o -L/home/xmn/mambaforge/envs/poc-pdfmm/lib -Wl,--as-needed -Wl,--no-undefined -fuse-ld=lld -Wl,-O1 -shared -fPIC -Wl,--start-group -Wl,-soname,libpoc-pdfmm-lib.so -Wl,-O2 -Wl,--sort-common -Wl,--as-needed -Wl,-z,relro -Wl,-z,now -Wl,--disable-new-dtags -Wl,--gc-sections -Wl,--allow-shlib-undefined -Wl,-rpath,/home/xmn/mambaforge/envs/poc-pdfmm/lib -Wl,-rpath-link,/home/xmn/mambaforge/envs/poc-pdfmm/lib -fvisibility-inlines-hidden -std=c++17 -fmessage-length=0 -march=nocona -mtune=haswell -ftree-vectorize -fPIC -fstack-protector-strong -fno-plt -O2 -ffunction-sections -pipe -isystem /home/xmn/mambaforge/envs/poc-pdfmm/include -DNDEBUG -D_FORTIFY_SOURCE=2 -O2 -isystem /home/xmn/mambaforge/envs/poc-pdfmm/include liblibpdfmm.so.a -lpthread /home/xmn/mambaforge/envs/poc-pdfmm/lib/libgflags.so.2.2.2 /home/xmn/mambaforge/envs/poc-pdfmm/lib/libglog.so.0.6.0 -Wl,--end-group
ld.lld: error: undefined symbol: vtable for mm::PdfString
>>> referenced by example.cpp
>>>               libpoc-pdfmm-lib.so.p/_mnt_sda1_storage_dev_inlyse-projects_poc-pdfmm_poc-pdfmm_src_example.cpp.o:(mm::PdfString::~PdfString())
>>> referenced by example.cpp
>>>               libpoc-pdfmm-lib.so.p/_mnt_sda1_storage_dev_inlyse-projects_poc-pdfmm_poc-pdfmm_src_example.cpp.o:(mm::PdfString::~PdfString())
>>> referenced by example.cpp
>>>               libpoc-pdfmm-lib.so.p/_mnt_sda1_storage_dev_inlyse-projects_poc-pdfmm_poc-pdfmm_src_example.cpp.o:(HelloWorld(std::basic_string_view<char, std::char_traits<char> > const&))
>>> the vtable symbol may be undefined because the class is missing its key function (see https://lld.llvm.org/missingkeyfunction)

ld.lld: error: undefined symbol: mm::PdfDataProvider::~PdfDataProvider()
>>> referenced by example.cpp
>>>               libpoc-pdfmm-lib.so.p/_mnt_sda1_storage_dev_inlyse-projects_poc-pdfmm_poc-pdfmm_src_example.cpp.o:(mm::PdfString::~PdfString())
>>> referenced by example.cpp
>>>               libpoc-pdfmm-lib.so.p/_mnt_sda1_storage_dev_inlyse-projects_poc-pdfmm_poc-pdfmm_src_example.cpp.o:(mm::PdfString::~PdfString())
>>> referenced by example.cpp
>>>               libpoc-pdfmm-lib.so.p/_mnt_sda1_storage_dev_inlyse-projects_poc-pdfmm_poc-pdfmm_src_example.cpp.o:(HelloWorld(std::basic_string_view<char, std::char_traits<char> > const&))
>>> referenced 4 more times

ld.lld: error: undefined symbol: mm::PdfError::PdfError(mm::PdfErrorCode, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, unsigned int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)
>>> referenced by example.cpp
>>>               libpoc-pdfmm-lib.so.p/_mnt_sda1_storage_dev_inlyse-projects_poc-pdfmm_poc-pdfmm_src_example.cpp.o:(HelloWorld(std::basic_string_view<char, std::char_traits<char> > const&) (.cold))

ld.lld: error: undefined symbol: mm::PdfPainter::FinishDrawing()
>>> referenced by example.cpp
>>>               libpoc-pdfmm-lib.so.p/_mnt_sda1_storage_dev_inlyse-projects_poc-pdfmm_poc-pdfmm_src_example.cpp.o:(HelloWorld(std::basic_string_view<char, std::char_traits<char> > const&) (.cold))
>>> referenced by example.cpp
>>>               libpoc-pdfmm-lib.so.p/_mnt_sda1_storage_dev_inlyse-projects_poc-pdfmm_poc-pdfmm_src_example.cpp.o:(HelloWorld(std::basic_string_view<char, std::char_traits<char> > const&))

ld.lld: error: undefined symbol: mm::PdfEncoding::~PdfEncoding()
>>> referenced by example.cpp
>>>               libpoc-pdfmm-lib.so.p/_mnt_sda1_storage_dev_inlyse-projects_poc-pdfmm_poc-pdfmm_src_example.cpp.o:(HelloWorld(std::basic_string_view<char, std::char_traits<char> > const&) (.cold))
>>> referenced by example.cpp
>>>               libpoc-pdfmm-lib.so.p/_mnt_sda1_storage_dev_inlyse-projects_poc-pdfmm_poc-pdfmm_src_example.cpp.o:(HelloWorld(std::basic_string_view<char, std::char_traits<char> > const&))

ld.lld: error: undefined symbol: mm::PdfPainter::~PdfPainter()
>>> referenced by example.cpp
>>>               libpoc-pdfmm-lib.so.p/_mnt_sda1_storage_dev_inlyse-projects_poc-pdfmm_poc-pdfmm_src_example.cpp.o:(HelloWorld(std::basic_string_view<char, std::char_traits<char> > const&) (.cold))
>>> referenced by example.cpp
>>>               libpoc-pdfmm-lib.so.p/_mnt_sda1_storage_dev_inlyse-projects_poc-pdfmm_poc-pdfmm_src_example.cpp.o:(HelloWorld(std::basic_string_view<char, std::char_traits<char> > const&))

ld.lld: error: undefined symbol: mm::PdfMemDocument::~PdfMemDocument()
>>> referenced by example.cpp
>>>               libpoc-pdfmm-lib.so.p/_mnt_sda1_storage_dev_inlyse-projects_poc-pdfmm_poc-pdfmm_src_example.cpp.o:(HelloWorld(std::basic_string_view<char, std::char_traits<char> > const&) (.cold))
>>> referenced by example.cpp
>>>               libpoc-pdfmm-lib.so.p/_mnt_sda1_storage_dev_inlyse-projects_poc-pdfmm_poc-pdfmm_src_example.cpp.o:(HelloWorld(std::basic_string_view<char, std::char_traits<char> > const&))

ld.lld: error: undefined symbol: mm::PdfMemDocument::PdfMemDocument(bool)
>>> referenced by example.cpp
>>>               libpoc-pdfmm-lib.so.p/_mnt_sda1_storage_dev_inlyse-projects_poc-pdfmm_poc-pdfmm_src_example.cpp.o:(HelloWorld(std::basic_string_view<char, std::char_traits<char> > const&))

ld.lld: error: undefined symbol: mm::PdfPainter::PdfPainter(mm::PdfPainterFlags)
>>> referenced by example.cpp
>>>               libpoc-pdfmm-lib.so.p/_mnt_sda1_storage_dev_inlyse-projects_poc-pdfmm_poc-pdfmm_src_example.cpp.o:(HelloWorld(std::basic_string_view<char, std::char_traits<char> > const&))

ld.lld: error: undefined symbol: mm::PdfDocument::GetPages()
>>> referenced by example.cpp
>>>               libpoc-pdfmm-lib.so.p/_mnt_sda1_storage_dev_inlyse-projects_poc-pdfmm_poc-pdfmm_src_example.cpp.o:(HelloWorld(std::basic_string_view<char, std::char_traits<char> > const&))

ld.lld: error: undefined symbol: mm::PdfPage::CreateStandardPageSize(mm::PdfPageSize, bool)
>>> referenced by example.cpp
>>>               libpoc-pdfmm-lib.so.p/_mnt_sda1_storage_dev_inlyse-projects_poc-pdfmm_poc-pdfmm_src_example.cpp.o:(HelloWorld(std::basic_string_view<char, std::char_traits<char> > const&))

ld.lld: error: undefined symbol: mm::PdfPageCollection::CreatePage(mm::PdfRect const&)
>>> referenced by example.cpp
>>>               libpoc-pdfmm-lib.so.p/_mnt_sda1_storage_dev_inlyse-projects_poc-pdfmm_poc-pdfmm_src_example.cpp.o:(HelloWorld(std::basic_string_view<char, std::char_traits<char> > const&))

ld.lld: error: undefined symbol: mm::PdfPainter::SetCanvas(mm::PdfCanvas*)
>>> referenced by example.cpp
>>>               libpoc-pdfmm-lib.so.p/_mnt_sda1_storage_dev_inlyse-projects_poc-pdfmm_poc-pdfmm_src_example.cpp.o:(HelloWorld(std::basic_string_view<char, std::char_traits<char> > const&))

ld.lld: error: undefined symbol: mm::PdfEncoding::PdfEncoding()
>>> referenced by example.cpp
>>>               libpoc-pdfmm-lib.so.p/_mnt_sda1_storage_dev_inlyse-projects_poc-pdfmm_poc-pdfmm_src_example.cpp.o:(HelloWorld(std::basic_string_view<char, std::char_traits<char> > const&))

ld.lld: error: undefined symbol: mm::PdfFontManager::GetFont(std::basic_string_view<char, std::char_traits<char> > const&, mm::PdfFontSearchParams const&, mm::PdfFontCreateParams const&)
>>> referenced by example.cpp
>>>               libpoc-pdfmm-lib.so.p/_mnt_sda1_storage_dev_inlyse-projects_poc-pdfmm_poc-pdfmm_src_example.cpp.o:(HelloWorld(std::basic_string_view<char, std::char_traits<char> > const&))

ld.lld: error: undefined symbol: mm::PdfTextStateWrapper::SetFont(mm::PdfFont const*, double)
>>> referenced by example.cpp
>>>               libpoc-pdfmm-lib.so.p/_mnt_sda1_storage_dev_inlyse-projects_poc-pdfmm_poc-pdfmm_src_example.cpp.o:(HelloWorld(std::basic_string_view<char, std::char_traits<char> > const&))

ld.lld: error: undefined symbol: mm::PdfPage::GetRect() const
>>> referenced by example.cpp
>>>               libpoc-pdfmm-lib.so.p/_mnt_sda1_storage_dev_inlyse-projects_poc-pdfmm_poc-pdfmm_src_example.cpp.o:(HelloWorld(std::basic_string_view<char, std::char_traits<char> > const&))

ld.lld: error: undefined symbol: mm::PdfPainter::DrawText(std::basic_string_view<char, std::char_traits<char> > const&, double, double)
>>> referenced by example.cpp
>>>               libpoc-pdfmm-lib.so.p/_mnt_sda1_storage_dev_inlyse-projects_poc-pdfmm_poc-pdfmm_src_example.cpp.o:(HelloWorld(std::basic_string_view<char, std::char_traits<char> > const&))

ld.lld: error: undefined symbol: mm::PdfDocument::GetInfo()
>>> referenced by example.cpp
>>>               libpoc-pdfmm-lib.so.p/_mnt_sda1_storage_dev_inlyse-projects_poc-pdfmm_poc-pdfmm_src_example.cpp.o:(HelloWorld(std::basic_string_view<char, std::char_traits<char> > const&))
>>> referenced by example.cpp
>>>               libpoc-pdfmm-lib.so.p/_mnt_sda1_storage_dev_inlyse-projects_poc-pdfmm_poc-pdfmm_src_example.cpp.o:(HelloWorld(std::basic_string_view<char, std::char_traits<char> > const&))
>>> referenced by example.cpp
>>>               libpoc-pdfmm-lib.so.p/_mnt_sda1_storage_dev_inlyse-projects_poc-pdfmm_poc-pdfmm_src_example.cpp.o:(HelloWorld(std::basic_string_view<char, std::char_traits<char> > const&))
>>> referenced 2 more times

ld.lld: error: undefined symbol: mm::PdfString::PdfString(char const*)
>>> referenced by example.cpp
>>>               libpoc-pdfmm-lib.so.p/_mnt_sda1_storage_dev_inlyse-projects_poc-pdfmm_poc-pdfmm_src_example.cpp.o:(HelloWorld(std::basic_string_view<char, std::char_traits<char> > const&))
>>> referenced by example.cpp
>>>               libpoc-pdfmm-lib.so.p/_mnt_sda1_storage_dev_inlyse-projects_poc-pdfmm_poc-pdfmm_src_example.cpp.o:(HelloWorld(std::basic_string_view<char, std::char_traits<char> > const&))
>>> referenced by example.cpp
>>>               libpoc-pdfmm-lib.so.p/_mnt_sda1_storage_dev_inlyse-projects_poc-pdfmm_poc-pdfmm_src_example.cpp.o:(HelloWorld(std::basic_string_view<char, std::char_traits<char> > const&))
>>> referenced 2 more times

ld.lld: error: too many errors emitted, stopping now (use -error-limit=0 to see all errors)
collect2: error: ld returned 1 exit status
[4/6] Compiling C++ object pocpdfmm.p/_mnt_sda1_storage_dev_inlyse-projects_poc-pdfmm_poc-pdfmm_src_main.cpp.o
/mnt/sda1/storage/dev/inlyse-projects/poc-pdfmm/poc-pdfmm/src/main.cpp: In function 'void show_version(int)':
/mnt/sda1/storage/dev/inlyse-projects/poc-pdfmm/poc-pdfmm/src/main.cpp:16:23: warning: unused parameter 'count' [-Wunused-parameter]
   16 | auto show_version(int count) -> void {
      |                   ~~~~^~~~~
ninja: build stopped: subcommand failed.

Another thing that I saw is that additionally to the include folder (that is really required), I need to specify "include/pdfmm" because in the headers files it is including "pdfmm_config.h". not sure if this is expected or if I am missing something. Normally I just need to point to my include folder from the (conda) environment and it is enough.

for instance, my code is here: https://github.com/xmnlab/poc-pdfmm basically it just has infrastructure code (scripts, build system, etc) and the example from this repository. when I have it properly working, I will replace that by some code from my own.

• [x] Checked coding style
• [x] Accept to license the code under the terms of the LGPL 2.1
• [x] Added attribution in AUTHORS.md

1. correction of C code and CMake files to easily install and then use headers and library in any other CMake based project; also fixed a bug in PdfImage.cpp file (cf3169c6a0d2cf1912ae1f860955f2c2f969af68)
2. added another sample to show table generation containing images (f21ca212318d721d2b6bef84d1c4b93930801bec)
3. above 3 checks implemented/followed (96eb5c461314c250b733e93af17cc4f54337b841)

• [x] Checked coding style
• [x] Accept to license the code under the terms of the LGPL 2.0 or later
• [x] Accept to license the code under the terms of the MPL 2.0

Hi everyone!

Currently I am packing that to conda-forge. If anyone wants to take a look into that before it is merged: https://github.com/conda-forge/staged-recipes/pull/20334/files

let me know if it needs any specific pinning there. I didn't find here any list of the dependencies with the versions that should work with pdfmm.

hope to have that merged really soon :)

Hi. I am trying to compile it on Linux x64. The compiler throws the following error:

[  1%] Building CXX object src/pdfmm/private/CMakeFiles/pdfmm_private.dir/FreetypePrivate.cpp.o
[  2%] Building CXX object src/pdfmm/private/CMakeFiles/pdfmm_private.dir/JpegCommon.cpp.o
[  2%] Building CXX object src/pdfmm/private/CMakeFiles/pdfmm_private.dir/PdfDeclarationsPrivate.cpp.o
In file included from /home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp:12:
/home/gcode/pdfmm/src/pdfmm/private/charconv_compat.h:22:11: error: conflicting declaration ‘using chars_format = enum fast_float::chars_format’
   22 |     using chars_format = fast_float::chars_format;
      |           ^~~~~~~~~~~~
In file included from /home/gcode/pdfmm/src/pdfmm/private/charconv_compat.h:4,
                 from /home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp:12:
/usr/include/c++/10/charconv:658:14: note: previous declaration as ‘enum class std::chars_format’
  658 |   enum class chars_format
      |              ^~~~~~~~~~~~
In file included from /home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp:13:
/home/gcode/pdfmm/src/pdfmm/private/utfcpp_extensions.h:165:31: error: ‘u16beoctetiterable’ does not name a type
  165 |     using u16bechariterable = u16beoctetiterable<char>;
      |                               ^~~~~~~~~~~~~~~~~~
/home/gcode/pdfmm/src/pdfmm/private/utfcpp_extensions.h:166:31: error: ‘u16leoctetiterable’ does not name a type
  166 |     using u16lechariterable = u16leoctetiterable<char>;
      |                               ^~~~~~~~~~~~~~~~~~
/home/gcode/pdfmm/src/pdfmm/private/utfcpp_extensions.h: In function ‘word_iterator std::append16(uint32_t, word_iterator)’:
/home/gcode/pdfmm/src/pdfmm/private/utfcpp_extensions.h:172:19: error: there are no arguments to ‘invalid_code_point’ that depend on a template parameter, so a declaration of ‘invalid_code_point’ must be available [-fpermissive]
  172 |             throw invalid_code_point(cp);
      |                   ^~~~~~~~~~~~~~~~~~
/home/gcode/pdfmm/src/pdfmm/private/utfcpp_extensions.h:172:19: note: (if you use ‘-fpermissive’, G++ will accept your code, but allowing the use of an undeclared name is deprecated)
/home/gcode/pdfmm/src/pdfmm/private/utfcpp_extensions.h: In function ‘void std::append(char32_t, std::u16string&)’:
/home/gcode/pdfmm/src/pdfmm/private/utfcpp_extensions.h:206:9: error: ‘append16’ was not declared in this scope
  206 |         append16(uint32_t(cp), std::back_inserter(s));
      |         ^~~~~~~~
/home/gcode/pdfmm/src/pdfmm/private/utfcpp_extensions.h:206:9: note: suggested alternatives:
/home/gcode/pdfmm/src/pdfmm/private/utfcpp_extensions.h:169:19: note:   ‘std::append16’
  169 |     word_iterator append16(uint32_t cp, word_iterator result)
      |                   ^~~~~~~~
/home/gcode/pdfmm/src/pdfmm/private/utfcpp_extensions.h:189:23: note:   ‘std::append16’
  189 |         word_iterator append16(uint32_t cp, word_iterator result)
      |                       ^~~~~~~~
In file included from /home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp:15:
/home/gcode/pdfmm/src/pdfmm/base/PdfInputStream.h: At global scope:
/home/gcode/pdfmm/src/pdfmm/base/PdfInputStream.h:57:17: error: ‘OutputStream’ has not been declared
   57 |     void CopyTo(OutputStream& stream);
      |                 ^~~~~~~~~~~~
/home/gcode/pdfmm/src/pdfmm/base/PdfInputStream.h:59:17: error: ‘OutputStream’ has not been declared
   59 |     void CopyTo(OutputStream& stream, size_t size);
      |                 ^~~~~~~~~~~~
In file included from /home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp:18:
/home/gcode/pdfmm/src/pdfmm/private/istringviewstream.h:212:9: error: ‘stringviewbuffer’ does not name a type
  212 |         stringviewbuffer<CharT> m_buf;
      |         ^~~~~~~~~~~~~~~~
/home/gcode/pdfmm/src/pdfmm/private/istringviewstream.h: In constructor ‘cmn::basic_istringviewstream<CharT>::basic_istringviewstream()’:
/home/gcode/pdfmm/src/pdfmm/private/istringviewstream.h:173:26: error: ‘m_buf’ was not declared in this scope
  173 |             this->rdbuf(&m_buf);
      |                          ^~~~~
/home/gcode/pdfmm/src/pdfmm/private/istringviewstream.h: In constructor ‘cmn::basic_istringviewstream<CharT>::basic_istringviewstream(const CharT*, std::size_t)’:
/home/gcode/pdfmm/src/pdfmm/private/istringviewstream.h:176:51: error: class ‘cmn::basic_istringviewstream<CharT>’ does not have any field named ‘m_buf’
  176 |             : std::basic_istream<CharT>(nullptr), m_buf(buffer, size)
      |                                                   ^~~~~
/home/gcode/pdfmm/src/pdfmm/private/istringviewstream.h:178:26: error: ‘m_buf’ was not declared in this scope
  178 |             this->rdbuf(&m_buf);
      |                          ^~~~~
/home/gcode/pdfmm/src/pdfmm/private/istringviewstream.h: In constructor ‘cmn::basic_istringviewstream<CharT>::basic_istringviewstream(const std::basic_string_view<Char>&)’:
/home/gcode/pdfmm/src/pdfmm/private/istringviewstream.h:182:51: error: class ‘cmn::basic_istringviewstream<CharT>’ does not have any field named ‘m_buf’
  182 |             : std::basic_istream<CharT>(nullptr), m_buf(view)
      |                                                   ^~~~~
/home/gcode/pdfmm/src/pdfmm/private/istringviewstream.h:184:26: error: ‘m_buf’ was not declared in this scope
  184 |             this->rdbuf(&m_buf);
      |                          ^~~~~
/home/gcode/pdfmm/src/pdfmm/private/istringviewstream.h: In member function ‘void cmn::basic_istringviewstream<CharT>::str(const CharT*, std::size_t)’:
/home/gcode/pdfmm/src/pdfmm/private/istringviewstream.h:197:13: error: ‘m_buf’ was not declared in this scope
  197 |             m_buf.str(buffer, size);
      |             ^~~~~
/home/gcode/pdfmm/src/pdfmm/private/istringviewstream.h: In member function ‘void cmn::basic_istringviewstream<CharT>::str(const std::basic_string_view<Char>&)’:
/home/gcode/pdfmm/src/pdfmm/private/istringviewstream.h:202:13: error: ‘m_buf’ was not declared in this scope
  202 |             m_buf.str(view);
      |             ^~~~~
/home/gcode/pdfmm/src/pdfmm/private/istringviewstream.h: At global scope:
/home/gcode/pdfmm/src/pdfmm/private/istringviewstream.h:215:31: error: ‘basic_istringviewstream’ does not name a type
  215 |     using istringviewstream = basic_istringviewstream<char>;
      |                               ^~~~~~~~~~~~~~~~~~~~~~~
/home/gcode/pdfmm/src/pdfmm/private/istringviewstream.h:216:32: error: ‘basic_istringviewstream’ does not name a type
  216 |     using wistringviewstream = basic_istringviewstream<wchar_t>;
      |                                ^~~~~~~~~~~~~~~~~~~~~~~
/home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp: In function ‘void utls::ReadTo(mm::charbuff&, const string_view&)’:
/home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp:302:5: error: ‘ReadTo’ was not declared in this scope; did you mean ‘utls::ReadTo’?
  302 |     ReadTo(str, istream);
      |     ^~~~~~
      |     utls::ReadTo
In file included from /home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp:9:
/home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.h:332:10: note: ‘utls::ReadTo’ declared here
  332 |     void ReadTo(mm::charbuff& str, std::istream& stream);
      |          ^~~~~~
/home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp: In function ‘void utls::WriteTo(const string_view&, const bufferview&)’:
/home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp:321:5: error: ‘WriteTo’ was not declared in this scope; did you mean ‘utls::WriteTo’?
  321 |     WriteTo(ostream, view);
      |     ^~~~~~~
      |     utls::WriteTo
In file included from /home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp:9:
/home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.h:334:10: note: ‘utls::WriteTo’ declared here
  334 |     void WriteTo(std::ostream& stream, const mm::bufferview& view);
      |          ^~~~~~~
/home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp: In function ‘void utls::WriteTo(std::ostream&, const bufferview&)’:
/home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp:326:10: error: ‘istringviewstream’ is not a member of ‘cmn’; did you mean ‘basic_istringviewstream’?
  326 |     cmn::istringviewstream istream(view.data(), view.size());
      |          ^~~~~~~~~~~~~~~~~
      |          basic_istringviewstream
/home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp:327:27: error: expected primary-expression before ‘)’ token
  327 |     CopyTo(stream, istream);
      |                           ^
/home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp:327:5: error: ‘CopyTo’ was not declared in this scope; did you mean ‘utls::CopyTo’?
  327 |     CopyTo(stream, istream);
      |     ^~~~~~
      |     utls::CopyTo
/home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp:285:6: note: ‘utls::CopyTo’ declared here
  285 | void utls::CopyTo(ostream& dst, istream& src)
      |      ^~~~
/home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp:324:55: warning: unused parameter ‘view’ [-Wunused-parameter]
  324 | void utls::WriteTo(ostream& stream, const bufferview& view)
      |                                     ~~~~~~~~~~~~~~~~~~^~~~
/home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp: In function ‘void utls::WriteUtf16BETo(std::u16string&, char32_t)’:
/home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp:445:5: error: ‘ByteSwap’ was not declared in this scope; did you mean ‘utls::ByteSwap’?
  445 |     ByteSwap(str);
      |     ^~~~~~~~
      |     utls::ByteSwap
In file included from /home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp:9:
/home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.h:434:20: note: ‘utls::ByteSwap’ declared here
  434 |     inline int64_t ByteSwap(int64_t n)
      |                    ^~~~~~~~
/home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp: In function ‘void utls::ReadUtf16BEString(const bufferview&, std::string&)’:
/home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp:451:11: error: ‘u16bechariterable’ is not a member of ‘utf8’; did you mean ‘u16beoctetiterable’?
  451 |     utf8::u16bechariterable iterable(buffer.data(), buffer.size());
      |           ^~~~~~~~~~~~~~~~~
      |           u16beoctetiterable
/home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp:452:20: error: ‘iterable’ was not declared in this scope
  452 |     utf8::utf16to8(iterable.begin(), iterable.end(), std::back_inserter(utf8str));
      |                    ^~~~~~~~
/home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp:449:48: warning: unused parameter ‘buffer’ [-Wunused-parameter]
  449 | void utls::ReadUtf16BEString(const bufferview& buffer, string& utf8str)
      |                              ~~~~~~~~~~~~~~~~~~^~~~~~
/home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp: In function ‘void utls::ReadUtf16LEString(const bufferview&, std::string&)’:
/home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp:457:11: error: ‘u16lechariterable’ is not a member of ‘utf8’; did you mean ‘u16leoctetiterable’?
  457 |     utf8::u16lechariterable iterable(buffer.data(), buffer.size());
      |           ^~~~~~~~~~~~~~~~~
      |           u16leoctetiterable
/home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp:458:20: error: ‘iterable’ was not declared in this scope
  458 |     utf8::utf16to8(iterable.begin(), iterable.end(), std::back_inserter(utf8str));
      |                    ^~~~~~~~
/home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp:455:48: warning: unused parameter ‘buffer’ [-Wunused-parameter]
  455 | void utls::ReadUtf16LEString(const bufferview& buffer, string& utf8str)
      |                              ~~~~~~~~~~~~~~~~~~^~~~~~
/home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp: In function ‘void utls::WriteUInt32BE(mm::OutputStream&, uint32_t)’:
/home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp:584:5: error: ‘WriteUInt32BE’ was not declared in this scope; did you mean ‘utls::WriteUInt32BE’?
  584 |     WriteUInt32BE(buf, value);
      |     ^~~~~~~~~~~~~
      |     utls::WriteUInt32BE
In file included from /home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp:9:
/home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.h:359:10: note: ‘utls::WriteUInt32BE’ declared here
  359 |     void WriteUInt32BE(char* buf, uint32_t value);
      |          ^~~~~~~~~~~~~
/home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp: In function ‘void utls::WriteInt32BE(mm::OutputStream&, int32_t)’:
/home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp:591:5: error: ‘WriteInt32BE’ was not declared in this scope; did you mean ‘utls::WriteInt32BE’?
  591 |     WriteInt32BE(buf, value);
      |     ^~~~~~~~~~~~
      |     utls::WriteInt32BE
In file included from /home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp:9:
/home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.h:360:10: note: ‘utls::WriteInt32BE’ declared here
  360 |     void WriteInt32BE(char* buf, int32_t value);
      |          ^~~~~~~~~~~~
/home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp: In function ‘void utls::WriteUInt16BE(mm::OutputStream&, uint16_t)’:
/home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp:598:5: error: ‘WriteUInt16BE’ was not declared in this scope; did you mean ‘utls::WriteUInt16BE’?
  598 |     WriteUInt16BE(buf, value);
      |     ^~~~~~~~~~~~~
      |     utls::WriteUInt16BE
In file included from /home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp:9:
/home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.h:361:10: note: ‘utls::WriteUInt16BE’ declared here
  361 |     void WriteUInt16BE(char* buf, uint16_t value);
      |          ^~~~~~~~~~~~~
/home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp: In function ‘void utls::WriteInt16BE(mm::OutputStream&, int16_t)’:
/home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp:605:5: error: ‘WriteInt16BE’ was not declared in this scope; did you mean ‘utls::WriteInt16BE’?
  605 |     WriteInt16BE(buf, value);
      |     ^~~~~~~~~~~~
      |     utls::WriteInt16BE
In file included from /home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp:9:
/home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.h:362:10: note: ‘utls::WriteInt16BE’ declared here
  362 |     void WriteInt16BE(char* buf, int16_t value);
      |          ^~~~~~~~~~~~
/home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp: In function ‘void utls::ReadUInt32BE(mm::InputStream&, uint32_t&)’:
/home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp:645:5: error: ‘ReadUInt32BE’ was not declared in this scope; did you mean ‘utls::ReadUInt32BE’?
  645 |     ReadUInt32BE(buf, value);
      |     ^~~~~~~~~~~~
      |     utls::ReadUInt32BE
In file included from /home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp:9:
/home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.h:367:10: note: ‘utls::ReadUInt32BE’ declared here
  367 |     void ReadUInt32BE(const char* buf, uint32_t& value);
      |          ^~~~~~~~~~~~
/home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp: In function ‘void utls::ReadInt32BE(mm::InputStream&, int32_t&)’:
/home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp:652:5: error: ‘ReadInt32BE’ was not declared in this scope; did you mean ‘utls::ReadInt32BE’?
  652 |     ReadInt32BE(buf, value);
      |     ^~~~~~~~~~~
      |     utls::ReadInt32BE
In file included from /home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp:9:
/home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.h:368:10: note: ‘utls::ReadInt32BE’ declared here
  368 |     void ReadInt32BE(const char* buf, int32_t& value);
      |          ^~~~~~~~~~~
/home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp: In function ‘void utls::ReadUInt16BE(mm::InputStream&, uint16_t&)’:
/home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp:659:5: error: ‘ReadUInt16BE’ was not declared in this scope; did you mean ‘utls::ReadUInt16BE’?
  659 |     ReadUInt16BE(buf, value);
      |     ^~~~~~~~~~~~
      |     utls::ReadUInt16BE
In file included from /home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp:9:
/home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.h:369:10: note: ‘utls::ReadUInt16BE’ declared here
  369 |     void ReadUInt16BE(const char* buf, uint16_t& value);
      |          ^~~~~~~~~~~~
/home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp: In function ‘void utls::ReadInt16BE(mm::InputStream&, int16_t&)’:
/home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp:666:5: error: ‘ReadInt16BE’ was not declared in this scope; did you mean ‘utls::ReadInt16BE’?
  666 |     ReadInt16BE(buf, value);
      |     ^~~~~~~~~~~
      |     utls::ReadInt16BE
In file included from /home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp:9:
/home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.h:370:10: note: ‘utls::ReadInt16BE’ declared here
  370 |     void ReadInt16BE(const char* buf, int16_t& value);
      |          ^~~~~~~~~~~
In file included from /usr/include/c++/10/algorithm:62,
                 from /home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.h:24,
                 from /home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp:9:
/usr/include/c++/10/bits/stl_algo.h: At global scope:
/usr/include/c++/10/bits/stl_algo.h:4304:5: warning: ‘_OIter std::transform(_IIter, _IIter, _OIter, _UnaryOperation) [with _IIter = __gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> >; _OIter = __gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> >; _UnaryOperation = utls::ToLower(const string_view&)::<lambda(unsigned char)>]’ used but never defined
 4304 |     transform(_InputIterator __first, _InputIterator __last,
      |     ^~~~~~~~~
In file included from /home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.h:27,
                 from /home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp:9:
/home/gcode/pdfmm/src/pdfmm/private/Format.h:21:24: warning: ‘void utls::FormatTo(std::string&, const string_view&, const Args& ...) [with Args = {double, short unsigned int}; std::string = std::__cxx11::basic_string<char>; std::string_view = std::basic_string_view<char>]’ used but never defined
   21 |     inline static void FormatTo(std::string& dst, const std::string_view& fmt, const Args&... args)
      |                        ^~~~~~~~
/home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp:34:13: warning: ‘void std::removeTrailingZeroes(std::string&)’ used but never defined
   34 | static void removeTrailingZeroes(string& str);
      |             ^~~~~~~~~~~~~~~~~~~~
In file included from /home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.h:27,
                 from /home/gcode/pdfmm/src/pdfmm/private/PdfDeclarationsPrivate.cpp:9:
/home/gcode/pdfmm/src/pdfmm/private/Format.h:21:24: warning: ‘void utls::FormatTo(std::string&, const string_view&, const Args& ...) [with Args = {float, short unsigned int}; std::string = std::__cxx11::basic_string<char>; std::string_view = std::basic_string_view<char>]’ used but never defined
   21 |     inline static void FormatTo(std::string& dst, const std::string_view& fmt, const Args&... args)
      |                        ^~~~~~~~
cc1plus: note: unrecognized command-line option ‘-Wno-unknown-warning-option’ may have been intended to silence earlier diagnostics
make[2]: *** [src/pdfmm/private/CMakeFiles/pdfmm_private.dir/build.make:108: src/pdfmm/private/CMakeFiles/pdfmm_private.dir/PdfDeclarationsPrivate.cpp.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:308: src/pdfmm/private/CMakeFiles/pdfmm_private.dir/all] Error 2
make: *** [Makefile:160: all] Error 2

Basically I am trying to rewrite the podofosign tool

Currently I don't know how to write these portions of code

CASE 1 (PdfAnnotation already exists which needs an update)

            pTemporaryAnnot = new PdfAnnotation( pExistingSigField, pPage );
            if( !pTemporaryAnnot )
                PODOFO_RAISE_ERROR_INFO( ePdfError_OutOfMemory, "Cannot allocate annotation object for existing signature field" );

            pSignField = new PdfSignatureField( pTemporaryAnnot );
            if( !pSignField )
                PODOFO_RAISE_ERROR_INFO( ePdfError_OutOfMemory, "Cannot allocate existing signature field object" );

CASE 2 (PdfAnnotation which must be created from scratch)

            PdfAnnotation* pAnnot = pPage->CreateAnnotation( ePdfAnnotation_Widget, annot_rect );
            if( !pAnnot )
                PODOFO_RAISE_ERROR_INFO( ePdfError_OutOfMemory, "Cannot allocate annotation object" );

            if( annot_position && annot_print )
                pAnnot->SetFlags( ePdfAnnotationFlags_Print );
            else if( !annot_position && ( !field_name || !field_use_existing ) )
                pAnnot->SetFlags( ePdfAnnotationFlags_Invisible | ePdfAnnotationFlags_Hidden );

            pSignField = new PdfSignatureField( pAnnot, pAcroForm, &document );

CASE 3

                PdfRect annotSize( 0.0, 0.0, annot_rect.GetWidth(), annot_rect.GetHeight() );
                PdfXObject sigXObject( annotSize, &document );

What i am trying to write

ATTEMPT 1

        std::unique_ptr<PdfAnnotation> tempAnnot = std::make_unique<PdfAnnotation>(pTemporaryAnnot);
        
        if ( !PdfAnnotation::TryCreateFromObject<PdfAnnotation>(*pExistingSigField, tempAnnot) )
        {
            MM_RAISE_ERROR_INFO( PdfErrorCode::OutOfMemory, "Cannot allocate annotation object for existing signature field" );
        }
        
        if( !pExistingSigField->GetDictionary().HasKey( "V" ) )
        {
            MM_RAISE_ERROR_INFO( PdfErrorCode::InvalidKey, "Cannot find 'V' key" );
        }
        
        std::unique_ptr<PdfField> signField = std::make_unique<PdfField>(pSignField);
        
        PdfObject *obj = pExistingSigField->GetDictionary().FindKey( "V" );
        
        if ( !PdfSignature::TryCreateFromObject(*obj, signField) )
        {
            // TODO: raise error
        }

        if( !pSignField )
        {
            MM_RAISE_ERROR_INFO( PdfErrorCode::OutOfMemory, "Cannot allocate existing signature field object" );
        }

ATTEMPT 2 it seems paradoxical but I didn't understand how to create a PdfSignature from scratch (starting from a PdfRect annot_rect)

ATTEMPT 3

        PdfObject *rect_obj = pExistingSigField->GetDictionary().GetKey("Rect");
        
        PdfXObjectForm *sigXObject;
        std::unique_ptr<PdfXObjectForm> sigObject = std::make_unique<PdfXObjectForm>(sigXObject);

        if ( !PdfXObjectForm::TryCreateFromObject(*rect_obj, sigObject) )
        {
            // TODO: raise error
        }

I noticed that the utility constructors are all private, I guess for a precise choice, it seems that the idea is to use TryCreateFromObject.

Also I realized that a concrete class of the PdfSigner is missing.

Thanks for your help!

I built pdfmm for iOS as static library by using Xcode.

Then I imported the generated .a in an app project in Xcode and I integrated pdfmm in my code, but when I build the app I got several unsatisfied link error:

fmt::v8::detail::write fmt::v8::detail::snprintf fmt::v8::detail::format_float fmt::v8::detail::snprintf_float fmt::v8::detail::decimal_point_impl fmt::v8::detail::thousands_sep_impl fmt::v8::detail::thousands_sep_result

this errors log in Xcode:

 "int fmt::v8::detail::snprintf_ "int fmt::v8::detail::snprintf_float<long double>(long double, int, fmt::v8::detail::float_specs, fmt::v8::detail::buffer<char>&)", referenced from:
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, long double, 0>(fmt::v8::appender, long double, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfElement.o)
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, long double, 0>(fmt::v8::appender, long double, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfPainter.o)
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, long double, 0>(fmt::v8::appender, long double, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfInputStream.o)
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, long double, 0>(fmt::v8::appender, long double, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfAcroForm.o)
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, long double, 0>(fmt::v8::appender, long double, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfEncoding.o)
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, long double, 0>(fmt::v8::appender, long double, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfOutputStream.o)
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, long double, 0>(fmt::v8::appender, long double, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfSignature.o)
      ...
  "int fmt::v8::detail::format_float<long double>(long double, int, fmt::v8::detail::float_specs, fmt::v8::detail::buffer<char>&)", referenced from:
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, long double, 0>(fmt::v8::appender, long double, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfElement.o)
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, long double, 0>(fmt::v8::appender, long double, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfPainter.o)
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, long double, 0>(fmt::v8::appender, long double, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfInputStream.o)
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, long double, 0>(fmt::v8::appender, long double, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfAcroForm.o)
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, long double, 0>(fmt::v8::appender, long double, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfEncoding.o)
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, long double, 0>(fmt::v8::appender, long double, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfOutputStream.o)
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, long double, 0>(fmt::v8::appender, long double, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfSignature.o)
      ...
  "char fmt::v8::detail::decimal_point_impl<char>(fmt::v8::detail::locale_ref)", referenced from:
      char fmt::v8::detail::decimal_point<char>(fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfElement.o)
      char fmt::v8::detail::decimal_point<char>(fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfPainter.o)
      char fmt::v8::detail::decimal_point<char>(fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfInputStream.o)
      char fmt::v8::detail::decimal_point<char>(fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfAcroForm.o)
      char fmt::v8::detail::decimal_point<char>(fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfEncoding.o)
      char fmt::v8::detail::decimal_point<char>(fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfOutputStream.o)
      char fmt::v8::detail::decimal_point<char>(fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfSignature.o)
      ...
  "int fmt::v8::detail::snprintf_float<double>(double, int, fmt::v8::detail::float_specs, fmt::v8::detail::buffer<char>&)", referenced from:
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, float, 0>(fmt::v8::appender, float, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfElement.o)
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, double, 0>(fmt::v8::appender, double, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfElement.o)
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, float, 0>(fmt::v8::appender, float, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfPainter.o)
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, double, 0>(fmt::v8::appender, double, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfPainter.o)
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, float, 0>(fmt::v8::appender, float, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfInputStream.o)
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, double, 0>(fmt::v8::appender, double, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfInputStream.o)
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, float, 0>(fmt::v8::appender, float, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfAcroForm.o)
      ...
  "int fmt::v8::detail::format_float<double>(double, int, fmt::v8::detail::float_specs, fmt::v8::detail::buffer<char>&)", referenced from:
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, float, 0>(fmt::v8::appender, float, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfElement.o)
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, double, 0>(fmt::v8::appender, double, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfElement.o)
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, float, 0>(fmt::v8::appender, float, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfPainter.o)
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, double, 0>(fmt::v8::appender, double, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfPainter.o)
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, float, 0>(fmt::v8::appender, float, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfInputStream.o)
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, double, 0>(fmt::v8::appender, double, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfInputStream.o)
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, float, 0>(fmt::v8::appender, float, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfAcroForm.o)
      ...
  "fmt::v8::detail::thousands_sep_result<char> fmt::v8::detail::thousands_sep_impl<char>(fmt::v8::detail::locale_ref)", referenced from:
      fmt::v8::detail::thousands_sep_result<char> fmt::v8::detail::thousands_sep<char>(fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfElement.o)
      fmt::v8::detail::thousands_sep_result<char> fmt::v8::detail::thousands_sep<char>(fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfPainter.o)
      fmt::v8::detail::thousands_sep_result<char> fmt::v8::detail::thousands_sep<char>(fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfInputStream.o)
      fmt::v8::detail::thousands_sep_result<char> fmt::v8::detail::thousands_sep<char>(fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfAcroForm.o)
      fmt::v8::detail::thousands_sep_result<char> fmt::v8::detail::thousands_sep<char>(fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfEncoding.o)
      fmt::v8::detail::thousands_sep_result<char> fmt::v8::detail::thousands_sep<char>(fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfOutputStream.o)
      fmt::v8::detail::thousands_sep_result<char> fmt::v8::detail::thousands_sep<char>(fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfSignature.o)float<long double>(long double, int, fmt::v8::detail::float_specs, fmt::v8::detail::buffer<char>&)", referenced from:
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, long double, 0>(fmt::v8::appender, long double, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfElement.o)
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, long double, 0>(fmt::v8::appender, long double, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfPainter.o)
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, long double, 0>(fmt::v8::appender, long double, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfInputStream.o)
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, long double, 0>(fmt::v8::appender, long double, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfAcroForm.o)
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, long double, 0>(fmt::v8::appender, long double, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfEncoding.o)
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, long double, 0>(fmt::v8::appender, long double, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfOutputStream.o)
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, long double, 0>(fmt::v8::appender, long double, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfSignature.o)
      ...
  "int fmt::v8::detail::format_float<long double>(long double, int, fmt::v8::detail::float_specs, fmt::v8::detail::buffer<char>&)", referenced from:
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, long double, 0>(fmt::v8::appender, long double, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfElement.o)
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, long double, 0>(fmt::v8::appender, long double, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfPainter.o)
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, long double, 0>(fmt::v8::appender, long double, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfInputStream.o)
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, long double, 0>(fmt::v8::appender, long double, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfAcroForm.o)
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, long double, 0>(fmt::v8::appender, long double, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfEncoding.o)
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, long double, 0>(fmt::v8::appender, long double, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfOutputStream.o)
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, long double, 0>(fmt::v8::appender, long double, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfSignature.o)
      ...
  "char fmt::v8::detail::decimal_point_impl<char>(fmt::v8::detail::locale_ref)", referenced from:
      char fmt::v8::detail::decimal_point<char>(fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfElement.o)
      char fmt::v8::detail::decimal_point<char>(fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfPainter.o)
      char fmt::v8::detail::decimal_point<char>(fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfInputStream.o)
      char fmt::v8::detail::decimal_point<char>(fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfAcroForm.o)
      char fmt::v8::detail::decimal_point<char>(fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfEncoding.o)
      char fmt::v8::detail::decimal_point<char>(fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfOutputStream.o)
      char fmt::v8::detail::decimal_point<char>(fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfSignature.o)
      ...
  "int fmt::v8::detail::snprintf_float<double>(double, int, fmt::v8::detail::float_specs, fmt::v8::detail::buffer<char>&)", referenced from:
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, float, 0>(fmt::v8::appender, float, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfElement.o)
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, double, 0>(fmt::v8::appender, double, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfElement.o)
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, float, 0>(fmt::v8::appender, float, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfPainter.o)
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, double, 0>(fmt::v8::appender, double, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfPainter.o)
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, float, 0>(fmt::v8::appender, float, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfInputStream.o)
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, double, 0>(fmt::v8::appender, double, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfInputStream.o)
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, float, 0>(fmt::v8::appender, float, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfAcroForm.o)
      ...
  "int fmt::v8::detail::format_float<double>(double, int, fmt::v8::detail::float_specs, fmt::v8::detail::buffer<char>&)", referenced from:
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, float, 0>(fmt::v8::appender, float, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfElement.o)
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, double, 0>(fmt::v8::appender, double, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfElement.o)
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, float, 0>(fmt::v8::appender, float, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfPainter.o)
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, double, 0>(fmt::v8::appender, double, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfPainter.o)
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, float, 0>(fmt::v8::appender, float, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfInputStream.o)
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, double, 0>(fmt::v8::appender, double, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfInputStream.o)
      fmt::v8::appender fmt::v8::detail::write<char, fmt::v8::appender, float, 0>(fmt::v8::appender, float, fmt::v8::basic_format_specs<char>, fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfAcroForm.o)
      ...
  "fmt::v8::detail::thousands_sep_result<char> fmt::v8::detail::thousands_sep_impl<char>(fmt::v8::detail::locale_ref)", referenced from:
      fmt::v8::detail::thousands_sep_result<char> fmt::v8::detail::thousands_sep<char>(fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfElement.o)
      fmt::v8::detail::thousands_sep_result<char> fmt::v8::detail::thousands_sep<char>(fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfPainter.o)
      fmt::v8::detail::thousands_sep_result<char> fmt::v8::detail::thousands_sep<char>(fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfInputStream.o)
      fmt::v8::detail::thousands_sep_result<char> fmt::v8::detail::thousands_sep<char>(fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfAcroForm.o)
      fmt::v8::detail::thousands_sep_result<char> fmt::v8::detail::thousands_sep<char>(fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfEncoding.o)
      fmt::v8::detail::thousands_sep_result<char> fmt::v8::detail::thousands_sep<char>(fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfOutputStream.o)
      fmt::v8::detail::thousands_sep_result<char> fmt::v8::detail::thousands_sep<char>(fmt::v8::detail::locale_ref) in libpdfmm-static.a(PdfSignature.o)

• [ ] Checked coding style
• [ ] Accept to license the code under the terms of the LGPL 2.1
• [ ] Added attribution in AUTHORS.md

1. above 3 checks implemented/followed
2. fixed a single build bug when building helloworld or helloworld-base14 sample

Tests are currently disabled and unmaintained. pdfmm is currently running on a closed source test suite. The idea would be to re-enable tests, also following ideas by Christopher Creutzig. The tests should be ported to googletest. Also a common fixture area with real world pdfs to test should be added.

pdfmm does not currently support rendering PDF content to a drawing/canvas surface. With the recent PdfEncoding work it should be much more easy to select the GID of the glyph to render, after having loaded the font with freetype. The rendering support should, as a minimum:

1. Be based on cairo (the C library, not the C++ wrapper cairomm);
2. Use the facilities in PdfEncoding/PdfFont to select the glyphs' GID;
3. Use some common linear algebra primitives to perform mathematic transformations.

The primitives in (3) are not yet available but they will be after the API for text extraction is delivered, as said in this issue. Before that the task is not yet available for graps.

The task is to recreate the following old PoDoFo tool:

podofosign - Digitally signs existing PDF file with the given certificate and private key https://github.com/pdfmm/pdfmm/tree/svntrunk/tools/podofosign

The task is not up for grabs currently. It may be rewritten by the project maintainer at a later stage.

The task is to recreate the following old PoDoFo tool:

podofoxmp - Modify or extract XMP information from a PDF file https://github.com/pdfmm/pdfmm/blob/svntrunk/man/podofoxmp.1 https://github.com/pdfmm/pdfmm/tree/svntrunk/tools/podofoxmp

The tool should be licensed using a new non GPL license, probably Apache License 2.0 or MIT, as decided in this discussion. Because of this, the tool must be created from scratch to respect the GPL license. No copy and paste plus porting of the old code accepted. A peek on the old code should be fine, but you should write the code yourself as part of a creative process and be able to demonstrate it was your authentic rewriting of the functionalities of the old tool, possibly featuring some new original ones.

The task is to recreate the following old PoDoFo tool:

podofouncompress - Uncompress PDF files https://github.com/pdfmm/pdfmm/blob/svntrunk/man/podofouncompress.1 https://github.com/pdfmm/pdfmm/tree/svntrunk/tools/podofouncompress

The tool should be licensed using a new non GPL license, probably Apache License 2.0 or MIT, as decided in this discussion. Because of this, the tool must be created from scratch to respect the GPL license. No copy and paste plus porting of the old code accepted. A peek on the old code should be fine, but you should write the code yourself as part of a creative process and be able to demonstrate it was your authentic rewriting of the functionalities of the old tool, possibly featuring some new original ones.

The task is to recreate the following old PoDoFo tool:

podofotxtextract - Extract all text from a PDF file https://github.com/pdfmm/pdfmm/blob/svntrunk/man/podofotxtextract.1

The task is not up for grabs as it will be rewritten by creating a new API for text extraction in pdfmm first by the maintainer.