mirror of https://github.com/qpdf/qpdf.git
Add coalesce contents capability
This commit is contained in:
Jay Berkenbilt
parent
25988e8d10
commit
b8723e97f4
29
ChangeLog
29
ChangeLog
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@ -78,6 +78,35 @@
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production use. Even if it did, it would be very unusual for a PDF
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file to actually be adversely affected by this issue.
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* Add support for coalescing a page's contents into a single
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stream if they are represented as an array of streams. This can be
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performed from the command line using the --coalesce-contents
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option. Coalescing content streams can simplify things for
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software that wants to operate on a page's content streams without
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having to handle weird edge cases like content streams split in
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the middle of tokens. Note that
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QPDFObjectHandle::parsePageContents and
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QPDFObjectHandle::parseContentStream already handled split content
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streams. This is mainly to set the stage for new methods of
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operating on page contents. The new method
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QPDFObjectHandle::pipeContentStreams will pipe all of a page's
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content streams though a single pipeline. The new method
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QPDFObjectHandle.coalesceContentStreams, when called on a page
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object, will do nothing if the page's contents are a single
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stream, but if they are an array of streams, it will replace the
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page's contents with a single stream whose contents are the
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concatenation of the original streams.
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* A few library routines throw exceptions if called on non-page
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objects. These constraints have been relaxed somewhat to make qpdf
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more tolerant of files whose page dictionaries are not properly
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marked as such. Mostly exceptions about page operations being
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called on non page objects will only be thrown in cases where the
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operation had no chance of succeeding anyway. This change has no
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impact on any default mode operations, but it could allow
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applications that use page-level APIs in QPDFObjectHandle to be
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more tolerant of certain types of damaged files.
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2018-02-04 Jay Berkenbilt <ejb@ql.org>
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* Add QPDFWriter::setLinearizationPass1Filename method and
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@ -200,6 +200,20 @@ class QPDFObjectHandle
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QPDF_DLL
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void pipePageContents(Pipeline* p);
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// When called on a stream or stream array that is some page's
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// content streams, do the same as pipePageContents. This method
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// is a lower level way to do what pipePageContents does, but it
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// allows you to perform this operation on a contents object that
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// is disconnected from a page object. The description argument
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// should describe the containing page and is used in error
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// messages. The all_description argument is initialized to
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// something that could be used to describe the result of the
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// pipeline. It is the description amended with the identifiers of
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// the underlying objects.
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QPDF_DLL
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void pipeContentStreams(Pipeline* p, std::string const& description,
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std::string& all_description);
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// Older method: stream_or_array should be the value of /Contents
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// from a page object. It's more convenient to just call
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// parsePageContents on the page object, and error messages will
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@ -556,30 +570,30 @@ class QPDFObjectHandle
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// Convenience routines for commonly performed functions
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// Throws an exception if this is not a Page object. Returns an
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// empty map if there are no images or no resources. This
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// function does not presently support inherited resources. If
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// this is a significant concern, call
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// Returns an empty map if there are no images or no resources.
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// This function does not presently support inherited resources.
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// If this is a significant concern, call
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// pushInheritedAttributesToPage() on the QPDF object that owns
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// this page. See comment in the source for details. Return
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// value is a map from XObject name to the image object, which is
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// always a stream.
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// this page. See comment in the source for details. Return value
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// is a map from XObject name to the image object, which is always
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// a stream.
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QPDF_DLL
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std::map<std::string, QPDFObjectHandle> getPageImages();
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// Returns a vector of stream objects representing the content
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// streams for the given page. This routine allows the caller to
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// not care whether there are one or more than one content streams
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// for a page. Throws an exception if this is not a Page object.
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// for a page.
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QPDF_DLL
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std::vector<QPDFObjectHandle> getPageContents();
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// Add the given object as a new content stream for this page. If
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// parameter 'first' is true, add to the beginning. Otherwise,
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// add to the end. This routine automatically converts the page
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// Add the given object as a new content stream for this page. If
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// parameter 'first' is true, add to the beginning. Otherwise, add
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// to the end. This routine automatically converts the page
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// contents to an array if it is a scalar, allowing the caller not
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// to care what the initial structure is. Throws an exception if
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// this is not a Page object.
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// to care what the initial structure is. You can call
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// coalesceContentStreams() afterwards if you want to force it to
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// be a single stream.
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QPDF_DLL
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void addPageContents(QPDFObjectHandle contents, bool first);
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@ -590,6 +604,16 @@ class QPDFObjectHandle
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QPDF_DLL
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void rotatePage(int angle, bool relative);
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// Coalesce a page's content streams. A page's content may be a
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// stream or an array of streams. If this page's content is an
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// array, concatenate the streams into a single stream. This can
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// be useful when working with files that split content streams in
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// arbitary spots, such as in the middle of a token, as that can
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// confuse some software. You could also call this after calling
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// addPageContents.
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QPDF_DLL
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void coalesceContentStreams();
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// Initializers for objects. This Factory class gives the QPDF
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// class specific permission to call factory methods without
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// making it a friend of the whole QPDFObjectHandle class.
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@ -724,8 +748,6 @@ class QPDFObjectHandle
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ParserCallbacks* callbacks);
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std::vector<QPDFObjectHandle> arrayOrStreamToStreamArray(
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std::string const& description, std::string& all_description);
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void pipeContentStreams(Pipeline* p, std::string const& description,
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std::string& all_description);
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static void warn(QPDF*, QPDFExc const&);
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bool initialized;
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@ -14,6 +14,7 @@
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#include <qpdf/QPDF_Stream.hh>
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#include <qpdf/QPDF_Reserved.hh>
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#include <qpdf/Pl_Buffer.hh>
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#include <qpdf/Pl_Concatenate.hh>
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#include <qpdf/BufferInputSource.hh>
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#include <qpdf/QPDFExc.hh>
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@ -28,6 +29,39 @@ class TerminateParsing
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{
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};
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class CoalesceProvider: public QPDFObjectHandle::StreamDataProvider
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{
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public:
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CoalesceProvider(QPDFObjectHandle containing_page,
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QPDFObjectHandle old_contents) :
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containing_page(containing_page),
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old_contents(old_contents)
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{
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}
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virtual ~CoalesceProvider()
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{
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}
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virtual void provideStreamData(int objid, int generation,
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Pipeline* pipeline);
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private:
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QPDFObjectHandle containing_page;
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QPDFObjectHandle old_contents;
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};
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void
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CoalesceProvider::provideStreamData(int, int, Pipeline* p)
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{
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QTC::TC("qpdf", "QPDFObjectHandle coalesce provide stream data");
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Pl_Concatenate concat("concatenate", p);
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std::string description = "page object " +
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QUtil::int_to_string(containing_page.getObjectID()) + " " +
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QUtil::int_to_string(containing_page.getGeneration());
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std::string all_description;
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old_contents.pipeContentStreams(&concat, description, all_description);
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concat.manualFinish();
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}
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void
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QPDFObjectHandle::ParserCallbacks::terminateParsing()
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{
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@ -691,7 +725,6 @@ QPDFObjectHandle::arrayOrStreamToStreamArray(
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std::vector<QPDFObjectHandle>
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QPDFObjectHandle::getPageContents()
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{
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assertPageObject();
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std::string description = "page object " +
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QUtil::int_to_string(this->objid) + " " +
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QUtil::int_to_string(this->generation);
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@ -703,7 +736,6 @@ QPDFObjectHandle::getPageContents()
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void
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QPDFObjectHandle::addPageContents(QPDFObjectHandle new_contents, bool first)
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{
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assertPageObject();
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new_contents.assertStream();
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std::vector<QPDFObjectHandle> orig_contents = getPageContents();
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@ -785,6 +817,33 @@ QPDFObjectHandle::rotatePage(int angle, bool relative)
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replaceKey("/Rotate", QPDFObjectHandle::newInteger(new_angle));
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}
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void
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QPDFObjectHandle::coalesceContentStreams()
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{
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assertPageObject();
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QPDFObjectHandle contents = this->getKey("/Contents");
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if (contents.isStream())
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{
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QTC::TC("qpdf", "QPDFObjectHandle coalesce called on stream");
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return;
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}
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QPDF* qpdf = getOwningQPDF();
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if (qpdf == 0)
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{
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// Should not be possible for a page object to not have an
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// owning PDF unless it was manually constructed in some
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// incorrect way.
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throw std::logic_error("coalesceContentStreams called on object"
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" with no associated PDF file");
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}
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QPDFObjectHandle new_contents = newStream(qpdf);
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this->replaceKey("/Contents", new_contents);
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PointerHolder<StreamDataProvider> provider =
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new CoalesceProvider(*this, contents);
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new_contents.replaceStreamData(provider, newNull(), newNull());
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}
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std::string
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QPDFObjectHandle::unparse()
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{
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@ -842,6 +901,7 @@ QPDFObjectHandle::parse(std::string const& object_str,
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void
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QPDFObjectHandle::pipePageContents(Pipeline* p)
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{
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assertPageObject();
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std::string description = "page object " +
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QUtil::int_to_string(this->objid) + " " +
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QUtil::int_to_string(this->generation);
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@ -879,6 +939,7 @@ QPDFObjectHandle::pipeContentStreams(
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void
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QPDFObjectHandle::parsePageContents(ParserCallbacks* callbacks)
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{
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assertPageObject();
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std::string description = "page object " +
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QUtil::int_to_string(this->objid) + " " +
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QUtil::int_to_string(this->generation);
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@ -1728,15 +1789,15 @@ QPDFObjectHandle::assertNumber()
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bool
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QPDFObjectHandle::isPageObject()
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{
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return (this->isDictionary() && this->hasKey("/Type") &&
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(this->getKey("/Type").getName() == "/Page"));
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// Some PDF files have /Type broken on pages.
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return (this->isDictionary() && this->hasKey("/Contents"));
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}
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bool
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QPDFObjectHandle::isPagesObject()
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{
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return (this->isDictionary() && this->hasKey("/Type") &&
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(this->getKey("/Type").getName() == "/Pages"));
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// Some PDF files have /Type broken on pages.
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return (this->isDictionary() && this->hasKey("/Kids"));
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}
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void
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21
qpdf/qpdf.cc
21
qpdf/qpdf.cc
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@ -90,6 +90,7 @@ struct Options
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qdf_mode(false),
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preserve_unreferenced_objects(false),
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newline_before_endstream(false),
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coalesce_contents(false),
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show_npages(false),
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deterministic_id(false),
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static_id(false),
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@ -154,6 +155,7 @@ struct Options
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bool preserve_unreferenced_objects;
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bool newline_before_endstream;
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std::string linearize_pass1;
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bool coalesce_contents;
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std::string min_version;
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std::string force_version;
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bool show_npages;
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@ -391,6 +393,7 @@ familiar with the PDF file format or who are PDF developers.\n\
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--object-streams=mode controls handing of object streams\n\
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--preserve-unreferenced preserve unreferenced objects\n\
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--newline-before-endstream always put a newline before endstream\n\
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--coalesce-contents force all pages' content to be a single stream\n\
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--qdf turns on \"QDF mode\" (below)\n\
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--linearize-pass1=file write intermediate pass of linearized file\n\
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for debugging\n\
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@ -1543,6 +1546,10 @@ static void parse_options(int argc, char* argv[], Options& o)
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}
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o.linearize_pass1 = parameter;
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}
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else if (strcmp(arg, "coalesce-contents") == 0)
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{
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o.coalesce_contents = true;
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}
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else if (strcmp(arg, "min-version") == 0)
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{
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if (parameter == 0)
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@ -1960,6 +1967,19 @@ static void do_inspection(QPDF& pdf, Options& o)
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}
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}
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static void handle_transformations(QPDF& pdf, Options& o)
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{
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if (o.coalesce_contents)
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{
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std::vector<QPDFObjectHandle> pages = pdf.getAllPages();
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for (std::vector<QPDFObjectHandle>::iterator iter = pages.begin();
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iter != pages.end(); ++iter)
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{
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(*iter).coalesceContentStreams();
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}
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}
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}
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static void handle_page_specs(QPDF& pdf, Options& o,
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std::vector<PointerHolder<QPDF> >& page_heap)
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{
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@ -2382,6 +2402,7 @@ int main(int argc, char* argv[])
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pdf.processFile(o.infilename, o.password);
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}
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handle_transformations(pdf, o);
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std::vector<PointerHolder<QPDF> > page_heap;
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if (! o.page_specs.empty())
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{
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@ -304,3 +304,5 @@ QPDFTokenizer EOF when not allowed 0
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QPDFTokenizer inline image at EOF 0
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Pl_QPDFTokenizer found ID 0
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QPDFObjectHandle non-stream in stream array 0
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QPDFObjectHandle coalesce called on stream 0
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QPDFObjectHandle coalesce provide stream data 0
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@ -734,6 +734,28 @@ $td->runtest("stream with tiff predictor",
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$td->EXIT_STATUS => 0},
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$td->NORMALIZE_NEWLINES);
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show_ntests();
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# ----------
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$td->notify("--- Coalesce contents ---");
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$n_tests += 4;
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$td->runtest("coalesce contents with qdf",
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{$td->COMMAND =>
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"qpdf --qdf --static-id" .
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" --coalesce-contents coalesce.pdf a.pdf"},
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{$td->STRING => "", $td->EXIT_STATUS => 0});
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$td->runtest("check output",
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{$td->FILE => "a.pdf"},
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{$td->FILE => "coalesce-out.qdf"});
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$td->runtest("coalesce contents without qdf",
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{$td->COMMAND =>
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"qpdf --static-id" .
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" --coalesce-contents coalesce.pdf a.pdf"},
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{$td->STRING => "", $td->EXIT_STATUS => 0});
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$td->runtest("check output",
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{$td->FILE => "a.pdf"},
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{$td->FILE => "coalesce-out.pdf"});
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show_ntests();
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# ----------
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$td->notify("--- Newline before endstream ---");
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Binary file not shown.
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@ -0,0 +1,171 @@
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%PDF-1.3
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%¿÷¢þ
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%QDF-1.0
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%% Original object ID: 1 0
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1 0 obj
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<<
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/Pages 2 0 R
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/Type /Catalog
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>>
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endobj
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%% Original object ID: 2 0
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2 0 obj
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<<
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/Count 2
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/Kids [
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3 0 R
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4 0 R
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]
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/Type /Pages
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>>
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endobj
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%% Page 1
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%% Original object ID: 3 0
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3 0 obj
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<<
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/Contents 5 0 R
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/MediaBox [
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0
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0
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612
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792
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]
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/Parent 2 0 R
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/Resources <<
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/Font <<
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/F1 7 0 R
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>>
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/ProcSet 8 0 R
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>>
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/Type /Page
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>>
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endobj
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%% Page 2
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%% Original object ID: 4 0
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4 0 obj
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<<
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/Contents 9 0 R
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/MediaBox [
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0
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0
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612
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792
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]
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/Parent 2 0 R
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/Resources <<
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/Font <<
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/F1 11 0 R
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>>
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/ProcSet 12 0 R
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>>
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/Type /Page
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>>
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endobj
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%% Contents for page 1
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%% Original object ID: 19 0
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5 0 obj
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<<
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/Length 6 0 R
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>>
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stream
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BT
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/F1 24 Tf
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72 720 Td
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(Potato) Tj
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ET [ /array/split ] BI
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/CS /G/W 66/H 47/BPC 8/F/Fl/DP<</Predictor 15/Columns 66>>
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ID xœÅÖIà P|ÿC;UÈ`ÀÓ7‘Z© ¦Ä˜Úæ<C39A>}Dðï_´ø ÉW©„œÄ-”ˆ>ÿ‡À<E280A1>>”^&®¡uâ]€"!‡•–*¬&<26>E|Sy® ðd-€<<3C>B0Bú@Nê+< hlèKÐî/56L ‰<C2A0>ã £–¹¦>0>Y<>ù!cì\Y Ø%Yð¥Ö8?& Öëˆ}j’ûè ;«<>3<EFBFBD>ÂÖlpÛsHöûtúQØTt*hÌUúãwÍÕÐ%¨)p–³"•DiRj¹–DYNUÓÙAv’Fà&
<0A>ÍÔu#c•ÆW ô߉W“O
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EI
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endstream
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endobj
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%QDF: ignore_newline
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6 0 obj
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371
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Loading…
Reference in New Issue