Re: [Podofo-users] Help installing podofo

[Dmitry Salychev]

Hi Reynaldo.

Podofo uses CMake to generate build files for different platforms. It means
that you'll need a minimum 2.6 version installed. I don't use a MacPorts
package manager on macOS, but Homebrew (https://brew.sh), so that's why I
cannot give you exact commands to install dependencies. However, these steps
should generally be enough to compile a basic version of Podofo:

$ tar xvf ./podofo-0.9.6.tar.gz
$ cd podofo-0.9.6
$ mkdir build-release
$ cd build-release/
$ cmake ..
$ make

I'm using FreeBSD 11.2, but output of the "cmake .." command should generally
be the same. You'll see something like this:


-- The C compiler identification is Clang 6.0.0
-- The CXX compiler identification is Clang 6.0.0
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
WANT_LIB64 unset; assuming normal library directory names
Will install libraries to /usr/local/lib
-- Looking for strings.h
-- Looking for strings.h - found
-- Looking for arpa/inet.h
-- Looking for arpa/inet.h - found
-- Looking for winsock2.h
-- Looking for winsock2.h - not found
-- Looking for mem.h
-- Looking for mem.h - not found
-- Looking for ctype.h
-- Looking for ctype.h - found
-- Looking for sys/types.h
-- Looking for sys/types.h - found
-- Looking for stdint.h
-- Looking for stdint.h - found
-- Looking for BaseTsd.h
-- Looking for BaseTsd.h - not found
-- Looking for sys/types.h
-- Looking for sys/types.h - found
-- Looking for stdint.h
-- Looking for stdint.h - found
-- Looking for stddef.h
-- Looking for stddef.h - found
-- Check size of long int
-- Check size of long int - done
-- Check size of int64_t
-- Check size of int64_t - done
-- Check if the system is big endian
-- Searching 16 bit integer
-- Check size of unsigned short
-- Check size of unsigned short - done
-- Using unsigned short
-- Check if the system is big endian - little endian
-- Found ZLIB: /usr/lib/libz.so
Found zlib headers in /usr/include, library at /usr/lib/libz.so
-- Found PkgConfig: /usr/local/bin/pkg-config (found version "1.4.2")
-- Checking for module 'libcrypto'
--   Package 'libcrypto', required by 'virtual:world', not found
-- Found LIBCRYPTO: /usr/lib/libcrypto.so
-- Performing Test PODOFO_HAVE_OPENSSL_1_1
-- Performing Test PODOFO_HAVE_OPENSSL_1_1 - Failed
-- Performing Test PODOFO_HAVE_OPENSSL_NO_RC4
-- Performing Test PODOFO_HAVE_OPENSSL_NO_RC4 - Failed
Found OpenSSL's libCrypto headers in /usr/include, library at
/usr/lib/libcrypto.so
-- Found LIBIDN: /usr/local/lib/libidn.so
Found libidn headers in /usr/local/include, library at /usr/local/lib/libidn.so
Libidn found. AES-256 Encryption support will be enabled
-- Found LIBJPEG: /usr/local/lib/libjpeg.so
Found libjpeg headers in /usr/local/include, library at
/usr/local/lib/libjpeg.so
-- Found TIFF: /usr/local/lib/libtiff.so
Found libtiff headers in /usr/local/include, library at
/usr/local/lib/libtiff.so
-- Found ZLIB: /usr/lib/libz.so (found version "1.2.11")
-- Found PNG: /usr/local/lib/libpng.so (found version "1.6.35+apng")
Found LibPng headers in /usr/local/include;/usr/include, library at
/usr/local/lib/libpng.so;/usr/lib/libz.so
-- Found UNISTRING: /usr/local/include
Found LibUnistring headers in /usr/local/include, library at
/usr/local/lib/libunistring.so
-- Found cppunit: -L/usr/local/lib -lcppunit
Found cppunit. Unit tests will be built.
-- Found OpenSSL: /usr/lib/libssl.so
Found freetype library at /usr/local/lib/libfreetype.so, headers
/usr/local/include/freetype2
-- Checking for module 'fontconfig'
--   Found fontconfig, version 2.12.6
-- Found Fontconfig: fontconfig;freetype
Found fontconfig headers in /usr/local/include, library at fontconfig;freetype
-- Could NOT find Lua50 (missing: LUA_LIBRARIES)
-- Could NOT find Lua (missing: LUA_LIBRARIES)
Lua not found - PoDoFoImpose and PoDoFoColor will be built without Lua support
Building multithreaded version of PoDoFo.
-- Looking for pthread.h
-- Looking for pthread.h - found
-- Looking for pthread_create
-- Looking for pthread_create - not found
-- Looking for pthread_create in pthreads
-- Looking for pthread_create in pthreads - not found
-- Looking for pthread_create in pthread
-- Looking for pthread_create in pthread - found
-- Found Threads: TRUE
Building static PoDoFo library
-- Configuring done
-- Generating done
-- Build files have been written to:
/home/dsl/Downloads/podofo-0.9.6/build-release


Personally, I'd recommend installing libjpeg, libtiff and libpng libraries to
let Podofo decode as 

Re: [Podofo-users] Patch to process DecodeParms array

[Dmitry Salychev]

Hi guys.

I didn't get any response and decided to remind about this patch. Do I
need to change/fix it?

Regards,
Dmitry

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[Podofo-users] Patch to process DecodeParms array

[Dmitry Salychev]

Hi guys.

I've noticed that array form of "DecodeParms" entry in a stream
dictionary cannot be processed even in the latest revision of PoDoFo.
There is a patch attached to improve PdfFilterFactory::CreateDecodeStream
a bit and assign selected dictionary from the array to a given filter
according its order.

Regards,
Dmitry
Index: podofo/trunk/src/base/PdfFilter.cpp
===
--- podofo/trunk/src/base/PdfFilter.cpp (revision 1933)
+++ podofo/trunk/src/base/PdfFilter.cpp (working copy)
@@ -338,25 +338,53 @@
 }
 
 PdfOutputStream* PdfFilterFactory::CreateDecodeStream( const TVecFilters & 
filters, PdfOutputStream* pStream,
-   const PdfDictionary* 
pDictionary ) 
+   const PdfDictionary* 
pDictionary )
 {
+PdfFilteredDecodeStream* pFilter;
+const PdfDictionary *pdict;
 TVecFilters::const_reverse_iterator it = filters.rbegin();
+const PdfArray *parms_arr;
+PdfArray::const_reverse_iterator parms_it;
 
 PODOFO_RAISE_LOGIC_IF( !filters.size(), "Cannot create an DecodeStream 
from an empty list of filters" );
 
-// TODO: support arrays and indirect objects here and the short name /DP
-if( pDictionary && pDictionary->HasKey( "DecodeParms" ) && 
pDictionary->GetKey( "DecodeParms" )->IsDictionary() )
-pDictionary = &(pDictionary->GetKey( "DecodeParms" )->GetDictionary());
+pdict = pDictionary;
 
-PdfFilteredDecodeStream* pFilter = new PdfFilteredDecodeStream( pStream, 
*it, false, pDictionary );
-++it;
+// TODO: support indirect objects here and the short form /DP instead of 
/DecodeParms
+parms_arr = NULL;
+if ( pdict && pdict->HasKey("DecodeParms") && 
pdict->GetKey("DecodeParms")->IsDictionary() ) {
+pdict = &(pdict->GetKey("DecodeParms")->GetDictionary());
+} else if ( pdict && pdict->HasKey("DecodeParms") && 
pdict->GetKey("DecodeParms")->IsArray() ) {
+parms_arr = &(pdict->GetKey("DecodeParms")->GetArray());
+parms_it = parms_arr->rbegin();
+} else {
+/* Keep pdict as is */;
+}
 
-while( it != filters.rend() ) 
-{
-pFilter = new PdfFilteredDecodeStream( pFilter, *it, true, pDictionary 
);
+if ( parms_arr != NULL ) {
+if (parms_it->IsDictionary()) {
+pFilter = new PdfFilteredDecodeStream(
+pStream, *it, false, &(parms_it->GetDictionary()));
+} else {
+pFilter = new PdfFilteredDecodeStream(pStream, *it, false, pdict);
+}
 ++it;
+++parms_it;
+} else {
+pFilter = new PdfFilteredDecodeStream(pStream, *it, false, pdict);
+++it;
 }
 
+while ( it != filters.rend() ) {
+if ( (parms_arr != NULL) && (parms_it != parms_arr->rend()) && 
parms_it->IsDictionary() ) {
+pFilter = new PdfFilteredDecodeStream(
+pFilter, *it, true, &(parms_it->GetDictionary()));
+} else {
+pFilter = new PdfFilteredDecodeStream(pFilter, *it, true, pdict);
+}
+++it;
+++parms_it;
+}
 return pFilter;
 }
 
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Re: [Podofo-users] Windows build on Podofo 0.9.5

[Dmitry Salychev]

Hello, Patrice.

Your configuration seems a bit complicated to me. Why not to specify all
of the required paths using CMake GUI and generate a VS project?

Regards,
Dmitry

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Re: [Podofo-users] extract tiff from scanned pdf

[Dmitry Salychev]

Hi Martin,

podofo mailing list doesn't look like an active place from my pov.

If you're going to decode buffer using CCITT decoder, I've bad news for you.
There is only a draft implementation of PdfCCITTFilter in
PdfFiltersPrivate.cpp. You may notice that method to decode block isn't
implemented at all:

void PdfCCITTFilter::DecodeBlockImpl( const char*, pdf_long )
{

}

I've a decoder implemented (using libtiff), but it's a part of proprietary
product and I'm just trying to persuade my team to prepare a patch and
donate
code to the library. Everyone would benefit in this case. I think I'll be
able
to share it in several weeks only.

P.S. I've podofo 0.9.5 sources, so my information can be outdated.

Regards,

- Dmitry
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Re: [Podofo-users] Fwd: Testing email flow through sourceforge...

[Dmitry Salychev]

I've got these two. It probably works at the moment.

Regards,

- Dmitry
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Re: [Podofo-users] Accessing the images of one page?

[Dmitry Salychev]

Hi Matthew, Olivier,

I agree about XObjects, but it's not so hard to deal with inline ones
using tokenizer class. I already have it implemented for both types
of images, but don't have enough time to prepare a good snippet.
Give me several days and it'll be here :)

Regards,

- Dmitry
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Re: [Podofo-users] Accessing the images of one page?

[Dmitry Salychev]

Olivier,

ah, I see.
Anyway, your idea is to get any PDF file, scan it page by page and perform
an
action if there is a specific image (QR code) placed on any page.
Am I correct?

Regards,

- Dmitry
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Re: [Podofo-users] Accessing the images of one page?

[Dmitry Salychev]

Hi, Olivier.

(this is a copy of my previous reply which, for some reason, wasn't posted
on the mailing list yesterday O_o)

First of all, you've to know what kind of image you're going to access. They
usually can be stored in a PDF file two ways: XObject image or inline one.
Does it make any sense?

Regards,

- Dmitry


Regards,

- Dmitry

On Tue, Feb 20, 2018 at 5:26 PM, Olivier Mascia  wrote:

> Dear all,
>
> The podofoimgextract tool is a good documentation on how to access all
> images in a PDF file.
> What I would like to do is access all the images used on one page.
> I'm a bit short on documentation or sample code to get inspiration, short
> of reading the Adobe PDF standard, I suppose. :)
>
> To understand the context, the purpose is to scan for QR barcodes on each
> page and act on that page when found. The QR side is not an issue. I'm just
> hardly finding my way on how to properly enumerate the images used on a
> page instead of browsing all the images as a whole without consideration on
> which page it is used. It probably is incredibly simple to do using the
> primitives of PoDoFo, but I'm still struggling learning it deeper than at
> its surface.
>
> If you know of a bit of code or merely a bit of documentation which might
> be useful for me to read, I'm all ears.
>
> Thanks a lot,
> --
> Best Regards, Meilleures salutations, Met vriendelijke groeten,
> Olivier Mascia
>
>
>
> 
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Re: [Podofo-users] Difference between PdfObject::GetReference() and PdfObject::Reference()

[Dmitry Salychev]

Georg,

no problem (: It's nice that this code helped.

Regards,

- Dmitry
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Re: [Podofo-users] Difference between PdfObject::GetReference() and PdfObject::Reference()

[Dmitry Salychev]

Hi, Georg.

I'm not a developer of PoDoFo and don't know any details lying deep there.
You may just take a look at the src/base/PdfObject.h and
src/base/PdfVariant.h to understand the difference between these two
functions:

inline const PdfReference & Reference() const;
inline const PdfReference & GetReference() const;

and their implementations:

const PdfReference & PdfObject::Reference() const
{
return m_reference;
}

const PdfReference & PdfVariant::GetReference() const
{
DelayedLoad();

if( !IsReference() )
{
PODOFO_RAISE_ERROR( ePdfError_InvalidDataType );
}

// Do not change this to an reinterpret_cast
// We need a c-style casts here to avoid crashes
// because a reinterpret_cast might point to a different position.
return *((PdfReference*)m_Data.pData);
}

Personally, I didn't have a need to find object by its object and generation
numbers, but I had to obtain 'em from an existing one. There is a chance
that
this piece of code to get a specific XObject by its name will be useful:

PdfObject *xobj;
int nobj, ngen;

xobj = get_xobject(_name, (PdfCanvas *)page);
/* Is object a reference? */
if (xobj->IsReference())
xobj = doc->GetObjects().GetObject(xobj->GetReference());
ngen = xobj->Reference().GenerationNumber();
nobj = xobj->Reference().ObjectNumber();
/* ... */

static PdfObject *get_xobject(PdfName *xobjname, PdfCanvas *pPage)
{
PdfObject *pResources = pPage->GetResources();
PdfObject *xobj_dict;

if (pResources != NULL &&
pResources->GetDictionary().HasKey(PdfName("XObject"))) {
xobj_dict = pResources->GetIndirectKey(PdfName("XObject"));
if (xobj_dict != NULL && xobj_dict->IsDictionary()) {
return xobj_dict->GetIndirectKey(*xobjname);
}
}
return NULL;
}


Regards,

- Dmitry

On Fri, Jan 12, 2018 at 10:35 PM, Georg Funk  wrote:

> Dear podofo-developers,
>
> could you please describe the difference between PdfObject::GetReference()
> and PdfObject::Reference()?
> I need a way to access PdfObjects from within a PfVecObjects vector by
> their object and generation number. Further I need a function to follow
> indirect references of an object.
> Can I use the above mentioned methods for these purposes?
>
> Thank you in advance!
>
> Regards,
> Georg
> 
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Re: [Podofo-users] Github instead of SourceForge

[Dmitry Salychev]

Hi,

Lack of time, probably. I'd prefer to see a roadmap of PoDoFo instead of
tinkering with version control systems.

Regards,

- Dmitry
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Re: [Podofo-users] Viewing encrypted PDFs produces error

[Dmitry Salychev]

Hi, Alex.

You're probably getting this error because of incorrect PDF files. You may
check it there: https://www.pdf-online.com/osa/validate.aspx (I wasn't able
to download your PDF files from that hosting for some reason).

It's also probably a good idea to retrieve the latest 0.9.5 version of
PoDoFo,
compile "podofopdfinfo" with debug symbols and run it under lldb or gdb.
Do not forget to place a breakpoint on a line where you're getting this
error from before running the program. When it stops, you'll be able to
get a callstack and guess what went wrong (or just post it here for further
investigation).

About the first question, it seems that "podofopdfinfo" tried to convert
a variable of common (variant) type into something specific and had no luck.
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[Podofo-users] Incorrect character displacement

[Dmitry Salychev]

Hi,

I'm using PoDoFo to extract character displacement to update a text matrix
correctly. This is a code fragment of mine:

PdfString str, ucode_str;
std::stack *stack;const PdfFontMetrics *f_metrics;...
/* Convert string to UTF8 */
str = stack->top().GetString();
ucode_str = ts->font->GetEncoding()->ConvertToUnicode(str,
ts->font);stack->pop();
c_str = (char *) ucode_str.GetStringUtf8().c_str();
/* Font metrics to obtain a character displacement */
f_metrics = ts->font->GetFontMetrics();
for (j = 0; j < strlen(c_str); j++) {
str_w = f_metrics->CharWidth(c_str[j]);

/* Adjust text matrix using str_w */
...}

It works well for some PDF files (str_w contains a useful width), but
doesn't work for others. In these cases str_w contains 0.0. I took a look
at the PoDoFo 0.9.5 sources and found CharWidth() implemented for all
sub-classes of PdfFontMetrics.

Am I missing something important during this string conversion?

-- 
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Dmitry Salychev
darkness@gmail.com
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