Add --keep-files-open-threshold (fixes #288)

Jay Berkenbilt
1 parent 011695df
Showing 6 changed files with 57 additions and 327 deletions
ChangeLog
manual/qpdf-manual.xml
qpdf/qpdf.cc
qpdf/qtest/qpdf.test
qpdf/qtest/qpdf/disable-kfo.out
qpdf/qtest/qpdf/enable-kfo.out
 2019-04-20  Jay Berkenbilt  <ejb@ql.org>
+	* Add parameter --keep-files-open-threshold to override the
+	maximum number of files that qpdf will allow to be kept open at
+	once. Fixes #288.
+
 	* Handle Unicode characters in filenames. The changes to support
 	Unicode on the CLI in Windows broke Unicode filenames. Fixes #298.
@@ -652,6 +652,19 @@ make
         more than the OS limit's number of files from a script and are
         not worried about a few seconds additional processing time,
         you may want to specify <option>--keep-files-open=n</option>.
+        The threshold for switching may be changed from the default
+        200 with the <option>--keep-files-open-threshold</option>
+        option.
+       </para>
+      </listitem>
+     </varlistentry>
+     <varlistentry>
+      <term><option>--keep-files-open-threshold=<replaceable>count</replaceable></option></term>
+      <listitem>
+       <para>
+        If specified, overrides the default value of 200 used as the
+        threshold for qpdf deciding whether or not to keep files open.
+        See <option>--keep-files-open</option> for details.
        </para>
       </listitem>
      </varlistentry>
@@ -134,6 +134,7 @@ struct Options
         preserve_unreferenced_page_resources(false),
         keep_files_open(true),
         keep_files_open_set(false),
+        keep_files_open_threshold(200), // default known in help and docs
         newline_before_endstream(false),
         coalesce_contents(false),
         flatten_annotations(false),
@@ -225,6 +226,7 @@ struct Options
     bool preserve_unreferenced_page_resources;
     bool keep_files_open;
     bool keep_files_open_set;
+    size_t keep_files_open_threshold;
     bool newline_before_endstream;
     std::string linearize_pass1;
     bool coalesce_contents;
@@ -634,6 +636,7 @@ class ArgParser
     void argPreserveUnreferenced();
     void argPreserveUnreferencedResources();
     void argKeepFilesOpen(char* parameter);
+    void argKeepFilesOpenThreshold(char* parameter);
     void argNewlineBeforeEndstream();
     void argLinearizePass1(char* parameter);
     void argCoalesceContents();
@@ -857,6 +860,8 @@ ArgParser::initOptionTable()
         &ArgParser::argPreserveUnreferencedResources);
     (*t)["keep-files-open"] = oe_requiredChoices(
         &ArgParser::argKeepFilesOpen, yn);
+    (*t)["keep-files-open-threshold"] = oe_requiredParameter(
+        &ArgParser::argKeepFilesOpenThreshold, "count");
     (*t)["newline-before-endstream"] = oe_bare(
         &ArgParser::argNewlineBeforeEndstream);
     (*t)["linearize-pass1"] = oe_requiredParameter(
@@ -1209,6 +1214,7 @@ ArgParser::argHelp()
         << "starting point, but its pages are replaced with pages as specified.\n"
         << "\n"
         << "--keep-files-open=[yn]\n"
+        << "--keep-files-threshold=count\n"
         << "--pages file [ --password=password ] [ page-range ] ... --\n"
         << "\n"
         << "For each file that pages should be taken from, specify the file, a\n"
@@ -1227,7 +1233,8 @@ ArgParser::argHelp()
         << "files will be kept open at the same time. This behavior can be overridden\n"
         << "by specifying --keep-files-open=[yn]. Closing and opening files can have\n"
         << "very high overhead on certain file systems, especially networked file\n"
-        << "systems.\n"
+        << "systems. The threshold of 200 can be modified with\n"
+        << "--keep-files-open-threshold\n"
         << "\n"
         << "The page range is a set of numbers separated by commas, ranges of\n"
         << "numbers separated dashes, or combinations of those.  The character\n"
@@ -1782,6 +1789,13 @@ ArgParser::argKeepFilesOpen(char* parameter)
 }
 void
+ArgParser::argKeepFilesOpenThreshold(char* parameter)
+{
+    o.keep_files_open_threshold =
+        static_cast<size_t>(QUtil::string_to_int(parameter));
+}
+
+void
 ArgParser::argNewlineBeforeEndstream()
 {
     o.newline_before_endstream = true;
@@ -4352,9 +4366,7 @@ static void handle_page_specs(QPDF&amp; pdf, Options&amp; o)
             PageSpec& page_spec = *iter;
             filenames.insert(page_spec.filename);
         }
-        // NOTE: The number 200 for this threshold is in the help
-        // message and manual and is baked into the test suite.
-        if (filenames.size() > 200)
+        if (filenames.size() > o.keep_files_open_threshold)
         {
             QTC::TC("qpdf", "qpdf disable keep files open");
             if (o.verbose)
@@ -1685,7 +1685,7 @@ $n_tests += 4;
     binmode F;
     my $content = <F>;
     close(F);
-    for (my $i = 1; $i <= 201; ++$i)
+    for (my $i = 1; $i <= 51; ++$i)
     {
         open(F, sprintf(">%03d-kfo.pdf", $i)) or die;
         binmode F;
@@ -1693,16 +1693,17 @@ $n_tests += 4;
         close(F);
     }
 }
-$td->runtest("disable keep files open",
+$td->runtest("automatic disable keep files open",
              {$td->COMMAND =>
                   "qpdf --verbose --static-id --empty" .
+                  " --keep-files-open-threshold=50" .
                   " --pages *kfo.pdf -- a.pdf"},
              {$td->FILE => "disable-kfo.out", $td->EXIT_STATUS => 0},
              $td->NORMALIZE_NEWLINES);
 $td->runtest("don't disable keep files open",
              {$td->COMMAND =>
                   "qpdf --verbose --static-id --empty" .
-                  " --pages 11*kfo.pdf -- a.pdf"},
+                  " --pages 01*kfo.pdf -- a.pdf"},
              {$td->FILE => "enable-kfo.out", $td->EXIT_STATUS => 0},
              $td->NORMALIZE_NEWLINES);
 $td->runtest("explict keep files open",
@@ -50,156 +50,6 @@ qpdf: processing 048-kfo.pdf
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 qpdf: removing unreferenced pages from primary input
 qpdf: adding pages from 001-kfo.pdf
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@@ -252,154 +102,4 @@ qpdf: adding pages from 048-kfo.pdf
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