Add --split-pages option (fixes #30)

Jay Berkenbilt
1 parent 8fe261d8
Showing 56 changed files with 1588 additions and 7 deletions
ChangeLog
examples/pdf-split-pages.cc
manual/qpdf-manual.xml
qpdf/qpdf.cc
qpdf/qpdf.testcov
qpdf/qtest/qpdf.test
qpdf/qtest/qpdf/01_single-exp.zdf
qpdf/qtest/qpdf/02_single-exp.zdf
qpdf/qtest/qpdf/03_single-exp.zdf
qpdf/qtest/qpdf/04_single-exp.zdf
qpdf/qtest/qpdf/05_single-exp.zdf
qpdf/qtest/qpdf/06_single-exp.zdf
qpdf/qtest/qpdf/07_single-exp.zdf
qpdf/qtest/qpdf/08_single-exp.zdf
qpdf/qtest/qpdf/09_single-exp.zdf
qpdf/qtest/qpdf/10_single-exp.zdf
qpdf/qtest/qpdf/11-pages.pdf
qpdf/qtest/qpdf/11_single-exp.zdf
qpdf/qtest/qpdf/a-01-single-exp.zdf
qpdf/qtest/qpdf/a-02-single-exp.zdf
 2017-08-05  Jay Berkenbilt  <ejb@ql.org>
+	* Add --single-pages option to cause output to be written to a
+	separate file for each page rather than one big file.
+
 	* Process --pages options earlier so that certain inspection
 	options, like --show-pages, can show the state after the merging
 	operations.
 //
 // This is a stand-alone example of splitting a PDF into individual
-// pages. It is much faster than using the qpdf command-line tool to
-// split into separate files per page.
+// pages. It does essentially the same thing that qpdf --split-pages
+// does.
 //
 #include <qpdf/QPDF.hh>
@@ -354,6 +354,75 @@ make
        </para>
       </listitem>
      </varlistentry>
+     <varlistentry>
+      <term><option>--single-pages</option></term>
+      <listitem>
+       <para>
+        Write each page to a separate output file. Output file names
+        are generated as follows:
+        <itemizedlist>
+         <listitem>
+          <para>
+           If the string <literal>%d</literal> appears in the output
+           file name, it is replaced with a zero-padded page number
+           starting from 1.
+          </para>
+         </listitem>
+         <listitem>
+          <para>
+           Otherwise, if the output file name ends in
+           <filename>.pdf</filename> (case insensitive), a zero-padded
+           page number, preceded by a dash, is inserted before the
+           file extension.
+          </para>
+         </listitem>
+         <listitem>
+          <para>
+           Otherwise, the file name is appended with a zero-padded
+           page number preceded by a dash.
+          </para>
+         </listitem>
+        </itemizedlist>
+       </para>
+       <para>
+        For example, if <filename>infile.pdf</filename> has 12 pages
+        <itemizedlist>
+         <listitem>
+          <para>
+           <command>qpdf infile.pdf %d-out</command> would generate
+           files <filename>01-out</filename> through
+           <filename>12-out</filename>
+          </para>
+         </listitem>
+         <listitem>
+          <para>
+           <command>qpdf infile.pdf outfile.pdf
+           --single-pages</command> would generate files
+           <filename>outfile-01.pdf</filename> through
+           <filename>outfile-12.pdf</filename>
+          </para>
+         </listitem>
+         <listitem>
+          <para>
+           <command>qpdf infile.pdf something.else</command> would generate
+           files <filename>something.else-01</filename> through
+           <filename>something.else-12</filename>
+          </para>
+         </listitem>
+        </itemizedlist>
+       </para>
+       <para>
+        Note that outlines, threads, and other global features of the
+        original PDF file are not preserved. For each page of output,
+        this option creates an empty PDF and copies a single page from
+        the output into it. If you require the global data, you will
+        have to run <command>qpdf</command> with the
+        <option>--pages</option> option once for each file. Using
+        <option>--single-pages</option> is much faster if you don't
+        require the global data.
+       </para>
+      </listitem>
+     </varlistentry>
     </variablelist>
    </para>
    <para>
@@ -43,6 +43,7 @@ struct Options
         password(0),
         linearize(false),
         decrypt(false),
+        single_pages(false),
         copy_encryption(false),
         encryption_file(0),
         encryption_file_password(0),
@@ -97,6 +98,7 @@ struct Options
     char const* password;
     bool linearize;
     bool decrypt;
+    bool single_pages;
     bool copy_encryption;
     char const* encryption_file;
     char const* encryption_file_password;
@@ -204,6 +206,7 @@ Basic Options\n\
 --encrypt options --    generate an encrypted file\n\
 --decrypt               remove any encryption on the file\n\
 --pages options --      select specific pages from one or more files\n\
+--single-pages          write each output page to a separate file\n\
 \n\
 If none of --copy-encryption, --encrypt or --decrypt are given, qpdf will\n\
 preserve any encryption data associated with a file.\n\
@@ -213,6 +216,16 @@ parameters will be copied, including both user and owner passwords, even\n\
 if the user password is used to open the other file.  This works even if\n\
 the owner password is not known.\n\
 \n\
+If --single-pages is specified, each page is written to a separate output\n\
+file. File names are generated as follows:\n\
+* If the string %d appears in the output file name, it is replaced with a\n\
+  zero-padded page number starting from 1\n\
+* Otherwise, if the output file name ends in .pdf (case insensitive), a\n\
+  zero-padded page number, preceded by a dash, is inserted before the file\n\
+  extension\n\
+* Otherwise, the file name is appended with a zero-padded page number\n\
+  preceded by a dash.\n\
+\n\
 \n\
 Encryption Options\n\
 ------------------\n\
@@ -1321,6 +1334,10 @@ static void parse_options(int argc, char* argv[], Options&amp; o)
                 }
                 o.force_version = parameter;
             }
+            else if (strcmp(arg, "single-pages") == 0)
+            {
+                o.single_pages = true;
+            }
             else if (strcmp(arg, "deterministic-id") == 0)
             {
                 o.deterministic_id = true;
@@ -1433,6 +1450,12 @@ static void parse_options(int argc, char* argv[], Options&amp; o)
         usage("no output file may be given for this option");
     }
+    if (o.require_outfile && (strcmp(o.outfilename, "-") == 0) &&
+        o.single_pages)
+    {
+        usage("--single-pages may not be used when writing to standard output");
+    }
+
     if (QUtil::same_file(o.infilename, o.outfilename))
     {
         QTC::TC("qpdf", "qpdf same file error");
@@ -1954,13 +1977,59 @@ static void set_writer_options(QPDF&amp; pdf, Options&amp; o, QPDFWriter&amp; w)
 static void write_outfile(QPDF& pdf, Options& o)
 {
-    if (strcmp(o.outfilename, "-") == 0)
+    if (o.single_pages)
+    {
+        // Generate output file pattern
+        std::string before;
+        std::string after;
+        size_t len = strlen(o.outfilename);
+        char* num_spot = strstr(const_cast<char*>(o.outfilename), "%d");
+        if (num_spot != 0)
+        {
+            QTC::TC("qpdf", "qpdf single-pages %d");
+            before = std::string(o.outfilename, (num_spot - o.outfilename));
+            after = num_spot + 2;
+        }
+        else if ((len >= 4) &&
+                 (QUtil::strcasecmp(o.outfilename + len - 4, ".pdf") == 0))
+        {
+            QTC::TC("qpdf", "qpdf single-pages .pdf");
+            before = std::string(o.outfilename, len - 4) + "-";
+            after = o.outfilename + len - 4;
+        }
+        else
+        {
+            QTC::TC("qpdf", "qpdf single-pages other");
+            before = std::string(o.outfilename) + "-";
+        }
+
+        std::vector<QPDFObjectHandle> const& pages = pdf.getAllPages();
+        int pageno_len = QUtil::int_to_string(pages.size()).length();
+        int pageno = 0;
+        for (std::vector<QPDFObjectHandle>::const_iterator iter = pages.begin();
+             iter != pages.end(); ++iter)
+        {
+            QPDFObjectHandle page = *iter;
+            std::string outfile =
+                before + QUtil::int_to_string(++pageno, pageno_len) + after;
+            QPDF outpdf;
+            outpdf.emptyPDF();
+            outpdf.addPage(page, false);
+            QPDFWriter w(outpdf, outfile.c_str());
+            set_writer_options(outpdf, o, w);
+            w.write();
+        }
+    }
+    else
     {
-        o.outfilename = 0;
+        if (strcmp(o.outfilename, "-") == 0)
+        {
+            o.outfilename = 0;
+        }
+        QPDFWriter w(pdf, o.outfilename);
+        set_writer_options(pdf, o, w);
+        w.write();
     }
-    QPDFWriter w(pdf, o.outfilename);
-    set_writer_options(pdf, o, w);
-    w.write();
 }
 int main(int argc, char* argv[])
@@ -287,3 +287,6 @@ QPDF stream with non-space 0
 qpdf same file error 0
 qpdf read args from stdin 0
 qpdf read args from file 0
+qpdf single-pages %d 0
+qpdf single-pages .pdf 0
+qpdf single-pages other 0
@@ -664,6 +664,61 @@ $td-&gt;runtest(&quot;combine show and --pages&quot;,
 show_ntests();
 # ----------
+$td->notify("--- Single Page ---");
+# sp = single-pages
+my @sp_cases = (
+    [11, '%d at beginning', '', '%d_single-out.zdf'],
+    [11, '%d at end', '--qdf', 'single-out.zdf_%d'],
+    [11, '%d in middle', '--encrypt u o 128 --', 'a-%d-single-out.zdf'],
+    [11, 'pdf extension', '', 'single-out.Pdf'],
+    [4, 'fallback', '--pages 11-pages.pdf 1-3 minimal.pdf --', 'single-out'],
+    );
+$n_tests += 1;
+for (@sp_cases)
+{
+    $n_tests += 1 + $_->[0];
+}
+
+$td->runtest("no single-pages to stdout",
+             {$td->COMMAND => "qpdf --single-pages 11-pages.pdf -"},
+             {$td->FILE => "single-pages-stdout.out", $td->EXIT_STATUS => 2},
+             $td->NORMALIZE_NEWLINES);
+
+foreach my $d (@sp_cases)
+{
+    my ($n, $description, $xargs, $out) = @$d;
+    $td->runtest("single pages " . $description,
+                 {$td->COMMAND =>
+                      "qpdf --static-id --single-pages 11-pages.pdf" .
+                      " $xargs $out"},
+                 {$td->STRING => "", $td->EXIT_STATUS => 0});
+    my $pattern = $out;
+    my $nlen = length($n);
+    if ($pattern =~ m/\%d/)
+    {
+        $pattern =~ s/\%d/\%0${nlen}d/;
+    }
+    elsif ($pattern =~ m/\.pdf$/i)
+    {
+        $pattern =~ s/(\.pdf$)/-%0${nlen}d$1/i;
+    }
+    else
+    {
+        $pattern .= "-%0${nlen}d";
+    }
+    for (my $i = 1; $i <= $n; ++$i)
+    {
+        my $actual = sprintf($pattern, $i);
+        my $expected = $actual;
+        $expected =~ s/single-out/single-exp/;
+        $td->runtest("checkout output page $i",
+                     {$td->FILE => $actual},
+                     {$td->FILE => $expected});
+    }
+}
+
+show_ntests();
+# ----------
 $td->notify("--- Numeric range parsing tests ---");
 my @nrange_tests = (
     [",5",
@@ -2426,4 +2481,5 @@ sub get_md5_checksum
 sub cleanup
 {
     system("rm -rf *.ps *.pnm ?.pdf ?.qdf *.enc* tif1 tif2 tiff-cache");
+    system("rm -rf *single-out*");
 }
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+qpdf: --single-pages may not be used when writing to standard output
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+Usage: qpdf [options] infile outfile
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+