OpenSystemsDevelopment / qpdf

Commit 28453a4908be35de9b8156c7375bd1346d4281d7

Authored by Jay Berkenbilt
1 parent 5e9e17e6

Add --keep-files-open flag (fixes #237)

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Showing 9 changed files with 806 additions and 7 deletions
ChangeLog
  View file @28453a4
  1 +2018-08-18 Jay Berkenbilt <ejb@ql.org>
  2 +
  3 + * Add new option --keep-files-open=[yn] to control whether qpdf
  4 + keeps files open when merging. Prior to version 8.1.0, qpdf always
  5 + kept all files open, but this meant that the number of files that
  6 + could be merged was limited by the operating system's open file
  7 + limit. Version 8.1.0 opened files as they were referenced, but
  8 + this caused a major performance impact. Version 8.2.0 optimized
  9 + the performance but did so in a way that, for local file systems,
  10 + there was a small but unavoidable performance hit, but for
  11 + networked file systems, the performance impact could be very high.
  12 + Starting with version 8.2.1, the default behavior is that files
  13 + are kept open if no more than 200 files are specified, but that
  14 + the behavior can be explicitly overridden with the
  15 + --keep-files-open flag. If you are merging more than 200 files but
  16 + less than the operating system's max open files limit, you may
  17 + want to use --keep-files-open=y. If you are using a local file
  18 + system where the overhead is low and you might sometimes merge
  19 + more than the OS limit's number of files, you may want to specify
  20 + --keep-files-open=n. Fixes #237.
  21 +
1 22 2018-08-16 Jay Berkenbilt <ejb@ql.org>
2 23  
3 24 * 8.2.0: release
... ...
qpdf/qpdf.cc
  View file @28453a4
... ... @@ -8,6 +8,7 @@
8 8 #include <qpdf/QUtil.hh>
9 9 #include <qpdf/QTC.hh>
10 10 #include <qpdf/ClosedFileInputSource.hh>
  11 +#include <qpdf/FileInputSource.hh>
11 12 #include <qpdf/Pl_StdioFile.hh>
12 13 #include <qpdf/Pl_Discard.hh>
13 14 #include <qpdf/PointerHolder.hh>
... ... @@ -95,6 +96,8 @@ struct Options
95 96 qdf_mode(false),
96 97 preserve_unreferenced_objects(false),
97 98 preserve_unreferenced_page_resources(false),
  99 + keep_files_open(true),
  100 + keep_files_open_set(false),
98 101 newline_before_endstream(false),
99 102 coalesce_contents(false),
100 103 show_npages(false),
... ... @@ -162,6 +165,8 @@ struct Options
162 165 bool qdf_mode;
163 166 bool preserve_unreferenced_objects;
164 167 bool preserve_unreferenced_page_resources;
  168 + bool keep_files_open;
  169 + bool keep_files_open_set;
165 170 bool newline_before_endstream;
166 171 std::string linearize_pass1;
167 172 bool coalesce_contents;
... ... @@ -384,6 +389,7 @@ These options allow pages to be selected from one or more PDF files.\n\
384 389 Whatever file is given as the primary input file is used as the\n\
385 390 starting point, but its pages are replaced with pages as specified.\n\
386 391 \n\
  392 +--keep-files-open=[yn]\n\
387 393 --pages file [ --password=password ] [ page-range ] ... --\n\
388 394 \n\
389 395 For each file that pages should be taken from, specify the file, a\n\
... ... @@ -396,6 +402,13 @@ non-page data (info, outlines, page numbers, etc. are taken from the\n\
396 402 primary input file. To discard this, use --empty as the primary\n\
397 403 input.\n\
398 404 \n\
  405 +By default, when more than 200 distinct files are specified, qpdf will\n\
  406 +close each file when not being referenced. With 200 files or fewer, all\n\
  407 +files will be kept open at the same time. This behavior can be overridden\n\
  408 +by specifying --keep-files-open=[yn]. Closing and opening files can have\n\
  409 +very high overhead on certain file systems, especially networked file\n\
  410 +systems.\n\
  411 +\n\
399 412 The page range is a set of numbers separated by commas, ranges of\n\
400 413 numbers separated dashes, or combinations of those. The character\n\
401 414 \"z\" represents the last page. A number preceded by an \"r\" indicates\n\
... ... @@ -1631,6 +1644,23 @@ static void parse_options(int argc, char* argv[], Options&amp; o)
1631 1644 {
1632 1645 o.preserve_unreferenced_page_resources = true;
1633 1646 }
  1647 + else if (strcmp(arg, "keep-files-open") == 0)
  1648 + {
  1649 + o.keep_files_open_set = true;
  1650 + if (parameter && (strcmp(parameter, "y") == 0))
  1651 + {
  1652 + o.keep_files_open = true;
  1653 + }
  1654 + else if (parameter && (strcmp(parameter, "n") == 0))
  1655 + {
  1656 + o.keep_files_open = false;
  1657 + }
  1658 + else
  1659 + {
  1660 + usage("--keep-files-open must be given as"
  1661 + " --keep-files-open=[yn]");
  1662 + }
  1663 + }
1634 1664 else if (strcmp(arg, "newline-before-endstream") == 0)
1635 1665 {
1636 1666 o.newline_before_endstream = true;
... ... @@ -2113,6 +2143,43 @@ static void handle_page_specs(QPDF&amp; pdf, Options&amp; o,
2113 2143 // Parse all page specifications and translate them into lists of
2114 2144 // actual pages.
2115 2145  
  2146 + if (! o.keep_files_open_set)
  2147 + {
  2148 + // Count the number of distinct files to determine whether we
  2149 + // should keep files open or not. Rather than trying to code
  2150 + // some portable heuristic based on OS limits, just hard-code
  2151 + // this at a given number and allow users to override.
  2152 + std::set<std::string> filenames;
  2153 + for (std::vector<PageSpec>::iterator iter = o.page_specs.begin();
  2154 + iter != o.page_specs.end(); ++iter)
  2155 + {
  2156 + PageSpec& page_spec = *iter;
  2157 + filenames.insert(page_spec.filename);
  2158 + }
  2159 + // NOTE: The number 200 for this threshold is in the help
  2160 + // message and manual and is baked into the test suite.
  2161 + if (filenames.size() > 200)
  2162 + {
  2163 + QTC::TC("qpdf", "qpdf disable keep files open");
  2164 + if (o.verbose)
  2165 + {
  2166 + std::cout << whoami << ": selecting --keep-open-files=n"
  2167 + << std::endl;
  2168 + }
  2169 + o.keep_files_open = false;
  2170 + }
  2171 + else
  2172 + {
  2173 + if (o.verbose)
  2174 + {
  2175 + std::cout << whoami << ": selecting --keep-open-files=y"
  2176 + << std::endl;
  2177 + }
  2178 + o.keep_files_open = true;
  2179 + QTC::TC("qpdf", "qpdf don't disable keep files open");
  2180 + }
  2181 + }
  2182 +
2116 2183 // Create a QPDF object for each file that we may take pages from.
2117 2184 std::map<std::string, QPDF*> page_spec_qpdfs;
2118 2185 std::map<std::string, ClosedFileInputSource*> page_spec_cfis;
... ... @@ -2149,14 +2216,29 @@ static void handle_page_specs(QPDF&amp; pdf, Options&amp; o,
2149 2216 std::cout << whoami << ": processing "
2150 2217 << page_spec.filename << std::endl;
2151 2218 }
2152   - ClosedFileInputSource* cis =
2153   - new ClosedFileInputSource(page_spec.filename.c_str());
2154   - PointerHolder<InputSource> is(cis);
2155   - cis->stayOpen(true);
  2219 + PointerHolder<InputSource> is;
  2220 + ClosedFileInputSource* cis = 0;
  2221 + if (! o.keep_files_open)
  2222 + {
  2223 + QTC::TC("qpdf", "qpdf keep files open n");
  2224 + cis = new ClosedFileInputSource(page_spec.filename.c_str());
  2225 + is = cis;
  2226 + cis->stayOpen(true);
  2227 + }
  2228 + else
  2229 + {
  2230 + QTC::TC("qpdf", "qpdf keep files open y");
  2231 + FileInputSource* fis = new FileInputSource();
  2232 + is = fis;
  2233 + fis->setFilename(page_spec.filename.c_str());
  2234 + }
2156 2235 qpdf->processInputSource(is, password);
2157   - cis->stayOpen(false);
2158 2236 page_spec_qpdfs[page_spec.filename] = qpdf;
2159   - page_spec_cfis[page_spec.filename] = cis;
  2237 + if (cis)
  2238 + {
  2239 + cis->stayOpen(false);
  2240 + page_spec_cfis[page_spec.filename] = cis;
  2241 + }
2160 2242 }
2161 2243  
2162 2244 // Read original pages from the PDF, and parse the page range
... ...
qpdf/qpdf.testcov
  View file @28453a4
... ... @@ -356,3 +356,7 @@ QPDFAcroFormDocumentHelper non-dictionary field 0
356 356 QPDFAcroFormDocumentHelper loop 0
357 357 QPDFAcroFormDocumentHelper field found 1
358 358 QPDFAcroFormDocumentHelper annotation found 1
  359 +qpdf disable keep files open 0
  360 +qpdf keep files open n 0
  361 +qpdf keep files open y 0
  362 +qpdf don't disable keep files open 0
... ...
qpdf/qtest/qpdf.test
  View file @28453a4
... ... @@ -1178,6 +1178,49 @@ foreach my $d (@sp_cases)
1178 1178  
1179 1179 show_ntests();
1180 1180 # ----------
  1181 +$td->notify("--- Keep Files Open ---");
  1182 +$n_tests += 4;
  1183 +
  1184 +{ # local scope
  1185 + open(F, "<minimal.pdf") or die;
  1186 + local $/ = undef;
  1187 + binmode F;
  1188 + my $content = <F>;
  1189 + close(F);
  1190 + for (my $i = 1; $i <= 201; ++$i)
  1191 + {
  1192 + open(F, sprintf(">%03d-kfo.pdf", $i)) or die;
  1193 + print F $content;
  1194 + close(F);
  1195 + }
  1196 +}
  1197 +$td->runtest("disable keep files open",
  1198 + {$td->COMMAND =>
  1199 + "qpdf --verbose --static-id --empty" .
  1200 + " --pages *kfo.pdf -- a.pdf"},
  1201 + {$td->FILE => "disable-kfo.out", $td->EXIT_STATUS => 0},
  1202 + $td->NORMALIZE_NEWLINES);
  1203 +$td->runtest("don't disable keep files open",
  1204 + {$td->COMMAND =>
  1205 + "qpdf --verbose --static-id --empty" .
  1206 + " --pages 1*kfo.pdf -- a.pdf"},
  1207 + {$td->FILE => "enable-kfo.out", $td->EXIT_STATUS => 0},
  1208 + $td->NORMALIZE_NEWLINES);
  1209 +$td->runtest("explict keep files open",
  1210 + {$td->COMMAND =>
  1211 + "qpdf --verbose --static-id --keep-files-open=y --empty" .
  1212 + " --pages 00?-kfo.pdf -- a.pdf"},
  1213 + {$td->FILE => "kfo-y.out", $td->EXIT_STATUS => 0},
  1214 + $td->NORMALIZE_NEWLINES);
  1215 +$td->runtest("explicit keep files open = n",
  1216 + {$td->COMMAND =>
  1217 + "qpdf --verbose --static-id --keep-files-open=n --empty" .
  1218 + " --pages 00?-kfo.pdf -- a.pdf"},
  1219 + {$td->FILE => "kfo-n.out", $td->EXIT_STATUS => 0},
  1220 + $td->NORMALIZE_NEWLINES);
  1221 +
  1222 +show_ntests();
  1223 +# ----------
1181 1224 $td->notify("--- Rotate Pages ---");
1182 1225 $n_tests += 4;
1183 1226 # Do absolute, positive, and negative on ranges that include
... ... @@ -3143,5 +3186,5 @@ sub get_md5_checksum
3143 3186 sub cleanup
3144 3187 {
3145 3188 system("rm -rf *.ps *.pnm ?.pdf ?.qdf *.enc* tif1 tif2 tiff-cache");
3146   - system("rm -rf *split-out*");
  3189 + system("rm -rf *split-out* ???-kfo.pdf");
3147 3190 }
... ...
qpdf/qtest/qpdf/disable-kfo.out 0 → 100644
  View file @28453a4
  1 +qpdf: selecting --keep-open-files=n
  2 +qpdf: processing 001-kfo.pdf
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  203 +qpdf: removing unreferenced pages from primary input
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qpdf/qtest/qpdf/enable-kfo.out 0 → 100644
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  103 +qpdf: adding pages from 100-kfo.pdf
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  View file @28453a4
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  10 +qpdf: removing unreferenced pages from primary input
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  20 +qpdf: wrote file a.pdf
... ...
qpdf/qtest/qpdf/verbose-merge.out
  View file @28453a4
  1 +qpdf: selecting --keep-open-files=y
1 2 qpdf: processing 20-pages.pdf
2 3 qpdf: processing ./20-pages.pdf
3 4 qpdf: processing minimal.pdf
... ...