124 lines
3.3 KiB
Diff
124 lines
3.3 KiB
Diff
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From e72a9d017742366cba636d783ea121279bfb7d6c Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Stefan=20Br=C3=BCns?= <stefan.bruens@rwth-aachen.de>
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Date: Thu, 9 Mar 2023 19:19:51 +0100
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Subject: [PATCH] Make ModDate and CreationDate in PDF reproducible
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Ghostscript ignores the date in the preamble and uses the current
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time instead. This notably breaks the SOURCE_DATE_EPOCH support
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for reproducible builds.
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Passing the creation time as DOCINFO pdfmark forces gs to use the
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specified date/time. Although ghostscript still adds the unreproducible
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DocumentUUID and trailer ID, it is sufficient when including the PDF
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figure with pdflatex.
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Reuse the SOURCE_DATE_EPOCH code from creation_date for determining
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the wanted timestamp, and return the formatted time via the new
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`creation_date_pdfmark` function.
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---
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fig2dev/creationdate.c | 38 +++++++++++++++++++++++++++++++++-----
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fig2dev/creationdate.h | 1 +
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fig2dev/dev/genps.c | 8 ++++++++
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3 files changed, 42 insertions(+), 5 deletions(-)
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diff --git a/fig2dev/creationdate.c b/fig2dev/creationdate.c
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index a51bfd4..de914a5 100644
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--- a/fig2dev/creationdate.c
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+++ b/fig2dev/creationdate.c
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@@ -36,8 +36,8 @@
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#include "creationdate.h"
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-int
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-creation_date(char *buf)
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+static struct tm*
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+parse_time()
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{
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time_t now;
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@@ -70,15 +70,43 @@ creation_date(char *buf)
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} else {
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/* no errors, epoch is valid */
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now = epoch;
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- strftime(buf, CREATION_TIME_LEN, "%F %H:%M:%S", gmtime(&now));
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- return true;
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+ return gmtime(&now);
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}
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}
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#endif
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/* fall trough on errors or !source_date_epoch */
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time(&now);
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- if (strftime(buf, CREATION_TIME_LEN, "%F %H:%M:%S", localtime(&now)))
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+ return localtime(&now);
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+}
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+
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+static struct tm*
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+get_time()
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+{
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+ static struct tm time = { 0 };
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+ static int initialized = 0;
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+ if (!initialized) {
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+ time = *parse_time();
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+ initialized = 1;
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+ }
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+ return &time;
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+}
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+
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+int
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+creation_date(char *buf)
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+{
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+ if (strftime(buf, CREATION_TIME_LEN, "%F %H:%M:%S", get_time()))
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+ return true;
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+ else
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+ return false;
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+}
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+
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+int
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+creation_date_pdfmark(char *buf)
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+{
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+ // Pdfmark format should be D:YYYYMMDDHHmmSSOHH’mm’.
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+ // Timezone offset (O...) may be omitted
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+ if (strftime(buf, CREATION_TIME_LEN, "D:%Y%m%d%H%M%S", get_time()))
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return true;
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else
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return false;
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diff --git a/fig2dev/creationdate.h b/fig2dev/creationdate.h
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index 048508a..199d985 100644
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--- a/fig2dev/creationdate.h
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+++ b/fig2dev/creationdate.h
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@@ -21,3 +21,4 @@
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#define CREATION_TIME_LEN 36
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extern int creation_date(char *buf);
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+extern int creation_date_pdfmark(char *buf);
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diff --git a/fig2dev/dev/genps.c b/fig2dev/dev/genps.c
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index 5bea35c..48e05a6 100644
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--- a/fig2dev/dev/genps.c
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+++ b/fig2dev/dev/genps.c
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@@ -1181,6 +1181,7 @@ genps_end(void)
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const int h = pageheight, w = pagewidth;
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int epslen, tiflen;
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struct stat fstat;
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+ char date_buf[CREATION_TIME_LEN];
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/* for multipage, translate and output objects for each page */
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if (multi_page) {
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@@ -1368,6 +1369,13 @@ genps_end(void)
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/* final DSC comment for eps output (EOF = end of document) */
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fputs("%EOF\n", tfp);
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+ if (pdfflag) {
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+ if (creation_date_pdfmark(date_buf))
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+ fprintf(tfp,
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+ "[ /ModDate (%s)\n /CreationDate (%s)\n /DOCINFO pdfmark\n",
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+ date_buf, date_buf);
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+ }
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+
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/* all ok */
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return 0;
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}
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--
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2.39.2
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