mirror of
https://github.com/qpdf/qpdf.git
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Avoid merging adjacent tokens when concatenating contents (fixes #444)
This commit is contained in:
Jay Berkenbilt
parent
0dea276997
commit
b30deaeeab
@ -1,5 +1,11 @@
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2020-10-23 Jay Berkenbilt <ejb@ql.org>
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* Bug fix: when concatenating content streams, insert a newline if
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needed to prevent the last token from the old stream from being
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merged with the first token of the new stream. Qpdf was mistakenly
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concatenating the streams without regard to the specification that
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content streams are to be broken on token boundaries. Fixes #444.
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* Bug fix: fix-qdf: properly handle empty streams with ignore
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newline.
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1
TODO
1
TODO
@ -4,7 +4,6 @@ Candidates for upcoming release
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* Open "next" issues
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* bugs
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* #473: zsh completion with directories
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* #444: concatenated stream/whitespace bug
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* Non-bugs
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* #446: recognize edited QDF files
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* #436: parsing of document with form xobject
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@ -165,6 +165,47 @@ QPDFObjectHandle::ParserCallbacks::terminateParsing()
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throw TerminateParsing();
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}
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class LastChar: public Pipeline
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{
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public:
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LastChar(Pipeline* next);
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virtual ~LastChar() = default;
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virtual void write(unsigned char* data, size_t len);
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virtual void finish();
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unsigned char getLastChar();
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private:
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unsigned char last_char;
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};
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LastChar::LastChar(Pipeline* next) :
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Pipeline("lastchar", next),
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last_char(0)
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{
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}
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void
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LastChar::write(unsigned char* data, size_t len)
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{
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if (len > 0)
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{
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this->last_char = data[len - 1];
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}
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getNext()->write(data, len);
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}
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void
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LastChar::finish()
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{
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getNext()->finish();
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}
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unsigned char
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LastChar::getLastChar()
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{
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return this->last_char;
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}
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QPDFObjectHandle::QPDFObjectHandle() :
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initialized(false),
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qpdf(0),
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@ -1600,21 +1641,31 @@ QPDFObjectHandle::pipeContentStreams(
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std::vector<QPDFObjectHandle> streams =
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arrayOrStreamToStreamArray(
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description, all_description);
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bool need_newline = false;
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for (std::vector<QPDFObjectHandle>::iterator iter = streams.begin();
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iter != streams.end(); ++iter)
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{
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if (need_newline)
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{
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p->write(QUtil::unsigned_char_pointer("\n"), 1);
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}
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LastChar lc(p);
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QPDFObjectHandle stream = *iter;
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std::string og =
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QUtil::int_to_string(stream.getObjectID()) + " " +
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QUtil::int_to_string(stream.getGeneration());
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std::string w_description = "content stream object " + og;
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if (! stream.pipeStreamData(p, 0, qpdf_dl_specialized))
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if (! stream.pipeStreamData(&lc, 0, qpdf_dl_specialized))
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{
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QTC::TC("qpdf", "QPDFObjectHandle errors in parsecontent");
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throw QPDFExc(qpdf_e_damaged_pdf, "content stream",
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w_description, 0,
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"errors while decoding content stream");
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}
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lc.finish();
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need_newline = (lc.getLastChar() != static_cast<unsigned char>('\n'));
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QTC::TC("qpdf", "QPDFObjectHandle need_newline",
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need_newline ? 0 : 1);
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}
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}
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@ -2090,14 +2090,9 @@ outfile.pdf</option>
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option causes qpdf to combine them into a single stream. Use
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of this option is never necessary for ordinary usage, but it
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can help when working with some files in some cases. For
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example, some PDF writers split page contents into small
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streams at arbitrary points that may fall in the middle of
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lexical tokens within the content, and some PDF readers may
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get confused on such files. If you use qpdf to coalesce the
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content streams, such readers may be able to work with the
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file more easily. This can also be combined with QDF mode or
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content normalization to make it easier to look at all of a
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page's contents at once.
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example, this can also be combined with QDF mode or content
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normalization to make it easier to look at all of a page's
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contents at once.
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</para>
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</listitem>
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</varlistentry>
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@ -2398,25 +2393,15 @@ outfile.pdf</option>
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You should not use this for “production” PDF files.
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</para>
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<para>
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This paragraph discusses edge cases of content normalization that
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are not of concern to most users and are not relevant when content
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normalization is not enabled. When normalizing content, if qpdf
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runs into any lexical errors, it will print a warning indicating
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that content may be damaged. The only situation in which qpdf is
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known to cause damage during content normalization is when a
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page's contents are split across multiple streams and streams are
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split in the middle of a lexical token such as a string, name, or
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inline image. There may be some pathological cases in which qpdf
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could damage content without noticing this, such as if the partial
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tokens at the end of one stream and the beginning of the next
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stream are both valid, but usually qpdf will be able to detect
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this case. For slightly increased safety, you can specify
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<option>--coalesce-contents</option> in addition to
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<option>--normalize-content</option> or <option>--qdf</option>.
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This will cause qpdf to combine all the content streams into one,
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thus recombining any split tokens. However doing this will prevent
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you from being able to see the original layout of the content
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streams. If you must inspect the original content streams in an
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When normalizing content, if qpdf runs into any lexical errors, it
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will print a warning indicating that content may be damaged. The
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only situation in which qpdf is known to cause damage during
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content normalization is when a page's contents are split across
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multiple streams and streams are split in the middle of a lexical
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token such as a string, name, or inline image. Note that files
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that do this are invalid since the PDF specification states that
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content streams are not to be split in the middle of a token. If
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you want to inspect the original content streams in an
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uncompressed format, you can always run with <option>--qdf
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--normalize-content=n</option> for a QDF file without content
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normalization, or alternatively
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@ -455,3 +455,4 @@ qpdf found shared resources in leaf 0
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qpdf found shared xobject in leaf 0
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QPDF copy foreign with data 1
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QPDF copy foreign with foreign_stream 1
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QPDFObjectHandle need_newline 1
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@ -1591,13 +1591,21 @@ $td->runtest("type checks with object streams",
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# ----------
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$td->notify("--- Coalesce contents ---");
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$n_tests += 6;
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$n_tests += 8;
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$td->runtest("qdf with normalize warnings",
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{$td->COMMAND =>
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"qpdf --qdf --static-id coalesce.pdf a.pdf"},
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"qpdf --qdf --static-id split-tokens.pdf a.pdf"},
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{$td->FILE => "normalize-warnings.out", $td->EXIT_STATUS => 3},
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$td->NORMALIZE_NEWLINES);
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$td->runtest("check output",
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{$td->FILE => "a.pdf"},
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{$td->FILE => "split-tokens.qdf"});
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$td->runtest("coalesce to qdf",
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{$td->COMMAND =>
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"qpdf --qdf --static-id coalesce.pdf a.pdf"},
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{$td->STRING => "", $td->EXIT_STATUS => 0},
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$td->NORMALIZE_NEWLINES);
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$td->runtest("check output",
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{$td->FILE => "a.pdf"},
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{$td->FILE => "coalesce.qdf"});
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@ -1831,12 +1839,12 @@ $td->runtest("unreferenced resources with bad token",
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{$td->COMMAND =>
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"qpdf --qdf --static-id --split-pages=2" .
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" --remove-unreferenced-resources=yes" .
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" coalesce.pdf split-out-bad-token.pdf"},
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{$td->FILE => "coalesce-split.out", $td->EXIT_STATUS => 3},
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" split-tokens.pdf split-out-bad-token.pdf"},
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{$td->FILE => "split-tokens-split.out", $td->EXIT_STATUS => 3},
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$td->NORMALIZE_NEWLINES);
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$td->runtest("check output",
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{$td->FILE => "split-out-bad-token-1-2.pdf"},
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{$td->FILE => "coalesce-split-1-2.pdf"});
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{$td->FILE => "split-tokens-split-1-2.pdf"});
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$td->runtest("shared images in form xobject",
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{$td->COMMAND => "qpdf --qdf --static-id --split-pages".
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Binary file not shown.
Binary file not shown.
Binary file not shown.
Binary file not shown.
@ -1,9 +1,9 @@
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WARNING: coalesce.pdf (offset 671): content normalization encountered bad tokens
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WARNING: coalesce.pdf (offset 671): normalized content ended with a bad token; you may be able to resolve this by coalescing content streams in combination with normalizing content. From the command line, specify --coalesce-contents
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WARNING: coalesce.pdf (offset 671): Resulting stream data may be corrupted but is may still useful for manual inspection. For more information on this warning, search for content normalization in the manual.
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WARNING: coalesce.pdf (offset 823): content normalization encountered bad tokens
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WARNING: coalesce.pdf (offset 823): Resulting stream data may be corrupted but is may still useful for manual inspection. For more information on this warning, search for content normalization in the manual.
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WARNING: coalesce.pdf (offset 962): content normalization encountered bad tokens
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WARNING: coalesce.pdf (offset 962): normalized content ended with a bad token; you may be able to resolve this by coalescing content streams in combination with normalizing content. From the command line, specify --coalesce-contents
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WARNING: coalesce.pdf (offset 962): Resulting stream data may be corrupted but is may still useful for manual inspection. For more information on this warning, search for content normalization in the manual.
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WARNING: split-tokens.pdf (offset 671): content normalization encountered bad tokens
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WARNING: split-tokens.pdf (offset 671): normalized content ended with a bad token; you may be able to resolve this by coalescing content streams in combination with normalizing content. From the command line, specify --coalesce-contents
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WARNING: split-tokens.pdf (offset 671): Resulting stream data may be corrupted but is may still useful for manual inspection. For more information on this warning, search for content normalization in the manual.
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WARNING: split-tokens.pdf (offset 823): content normalization encountered bad tokens
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WARNING: split-tokens.pdf (offset 823): Resulting stream data may be corrupted but is may still useful for manual inspection. For more information on this warning, search for content normalization in the manual.
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WARNING: split-tokens.pdf (offset 962): content normalization encountered bad tokens
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WARNING: split-tokens.pdf (offset 962): normalized content ended with a bad token; you may be able to resolve this by coalescing content streams in combination with normalizing content. From the command line, specify --coalesce-contents
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WARNING: split-tokens.pdf (offset 962): Resulting stream data may be corrupted but is may still useful for manual inspection. For more information on this warning, search for content normalization in the manual.
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qpdf: operation succeeded with warnings; resulting file may have some problems
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@ -1,4 +1,4 @@
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WARNING: coalesce.pdf, object 3 0 at offset 181: Bad token found while scanning content stream; not attempting to remove unreferenced objects from this page
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WARNING: split-tokens.pdf, object 3 0 at offset 181: Bad token found while scanning content stream; not attempting to remove unreferenced objects from this page
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WARNING: empty PDF: content normalization encountered bad tokens
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WARNING: empty PDF: normalized content ended with a bad token; you may be able to resolve this by coalescing content streams in combination with normalizing content. From the command line, specify --coalesce-contents
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WARNING: empty PDF: Resulting stream data may be corrupted but is may still useful for manual inspection. For more information on this warning, search for content normalization in the manual.
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217
qpdf/qtest/qpdf/split-tokens.pdf
Normal file
217
qpdf/qtest/qpdf/split-tokens.pdf
Normal file
@ -0,0 +1,217 @@
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%PDF-1.3
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%¿÷¢þ
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%QDF-1.0
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1 0 obj
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2 0 obj
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/Count 2
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/F1 13 0 R
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/Type /Page
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%% Page 2
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4 0 obj
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612
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792
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/Type /Page
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endobj
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%% Contents for page 1
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5 0 obj
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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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(Pot
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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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33
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endobj
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%% Contents for page 1
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7 0 obj
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/Length 8 0 R
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>>
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stream
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ato) Tj
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ET [ /array
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endstream
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endobj
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%QDF: ignore_newline
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8 0 obj
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19
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endobj
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%% Contents for page 1
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9 0 obj
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endstream
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endobj
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%QDF: ignore_newline
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10 0 obj
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253
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endobj
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%% Contents for page 1
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11 0 obj
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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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12 0 obj
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66
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13 0 obj
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>>
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endobj
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14 0 obj
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[
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/PDF
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]
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endobj
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%% Contents for page 2
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15 0 obj
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<<
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/Length 16 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
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endstream
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endobj
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16 0 obj
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44
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endobj
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17 0 obj
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<<
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/BaseFont /Helvetica
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/Encoding /WinAnsiEncoding
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/Name /F1
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/Subtype /Type1
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/Type /Font
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>>
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endobj
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18 0 obj
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[
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startxref
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1918
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%%EOF
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231
qpdf/qtest/qpdf/split-tokens.qdf
Normal file
231
qpdf/qtest/qpdf/split-tokens.qdf
Normal file
@ -0,0 +1,231 @@
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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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>>
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%% Original object ID: 2 0
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2 0 obj
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<<
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3 0 R
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4 0 R
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]
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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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2274
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Loading…
Reference in New Issue
Block a user