gpdl: Fix overrun while looking for UEL in various gpdl interpreters.

Spotted by valgrinding the file/command line from bug 704692. Sadly,
this doesn't fix the actual problem though.

7 files changed, 13 insertions, 13 deletions

diff --git a/gpdl/jbig2top.c b/gpdl/jbig2top.c
index 15f1eefea..9ac01ccb6 100644
--- a/gpdl/jbig2top.c
+++ b/gpdl/jbig2top.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 2019-2021 Artifex Software, Inc.
+/* Copyright (C) 2019-2022 Artifex Software, Inc.
    All Rights Reserved.
 
    This software is provided AS-IS with no warranty, either express or
@@ -270,7 +270,7 @@ bytes_until_uel(const stream_cursor_read *pr)
             p++;
         if (p == q)
             break;
-        avail = pr->limit - pr->ptr;
+        avail = q - p;
         if (memcmp(p, "\033%-12345X", min(avail, 9)) == 0) {
             /* At least a partial match to a UEL. Everything up to
              * the start of the match is up for grabs. */
diff --git a/gpdl/jp2ktop.c b/gpdl/jp2ktop.c
index 899e83745..3bc7009e4 100644
--- a/gpdl/jp2ktop.c
+++ b/gpdl/jp2ktop.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 2019-2021 Artifex Software, Inc.
+/* Copyright (C) 2019-2022 Artifex Software, Inc.
    All Rights Reserved.
 
    This software is provided AS-IS with no warranty, either express or
@@ -350,7 +350,7 @@ bytes_until_uel(const stream_cursor_read *pr)
             p++;
         if (p == q)
             break;
-        avail = pr->limit - pr->ptr;
+        avail = q - p;
         if (memcmp(p, "\033%-12345X", min(avail, 9)) == 0) {
             /* At least a partial match to a UEL. Everything up to
              * the start of the match is up for grabs. */
diff --git a/gpdl/jpgtop.c b/gpdl/jpgtop.c
index 517e293d7..7120b1304 100644
--- a/gpdl/jpgtop.c
+++ b/gpdl/jpgtop.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 2019-2021 Artifex Software, Inc.
+/* Copyright (C) 2019-2022 Artifex Software, Inc.
    All Rights Reserved.
 
    This software is provided AS-IS with no warranty, either express or
@@ -364,7 +364,7 @@ bytes_until_uel(const stream_cursor_read *pr)
             p++;
         if (p == q)
             break;
-        avail = pr->limit - pr->ptr;
+        avail = q - p;
         if (memcmp(p, "\033%-12345X", min(avail, 9)) == 0) {
             /* At least a partial match to a UEL. Everything up to
              * the start of the match is up for grabs. */
diff --git a/gpdl/pngtop.c b/gpdl/pngtop.c
index f50242664..8822ac2ba 100644
--- a/gpdl/pngtop.c
+++ b/gpdl/pngtop.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 2019-2021 Artifex Software, Inc.
+/* Copyright (C) 2019-2022 Artifex Software, Inc.
    All Rights Reserved.
 
    This software is provided AS-IS with no warranty, either express or
@@ -293,7 +293,7 @@ bytes_until_uel(const stream_cursor_read *pr)
             p++;
         if (p == q)
             break;
-        avail = pr->limit - pr->ptr;
+        avail = q - p;
         if (memcmp(p, "\033%-12345X", min(avail, 9)) == 0) {
             /* At least a partial match to a UEL. Everything up to
              * the start of the match is up for grabs. */
diff --git a/gpdl/psitop.c b/gpdl/psitop.c
index 367599abc..590f12627 100644
--- a/gpdl/psitop.c
+++ b/gpdl/psitop.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 2001-2021 Artifex Software, Inc.
+/* Copyright (C) 2001-2022 Artifex Software, Inc.
    All Rights Reserved.
 
    This software is provided AS-IS with no warranty, either express or
diff --git a/gpdl/pwgtop.c b/gpdl/pwgtop.c
index 3f4cd90ed..2f44bb7e8 100644
--- a/gpdl/pwgtop.c
+++ b/gpdl/pwgtop.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 2019-2021 Artifex Software, Inc.
+/* Copyright (C) 2019-2022 Artifex Software, Inc.
    All Rights Reserved.
 
    This software is provided AS-IS with no warranty, either express or
@@ -340,7 +340,7 @@ bytes_until_uel(const stream_cursor_read *pr)
             p++;
         if (p == q)
             break;
-        avail = pr->limit - pr->ptr;
+        avail = q - p;
         if (memcmp(p, "\033%-12345X", min(avail, 9)) == 0) {
             /* At least a partial match to a UEL. Everything up to
              * the start of the match is up for grabs. */
diff --git a/gpdl/tifftop.c b/gpdl/tifftop.c
index 5876eb87a..4398cb187 100644
--- a/gpdl/tifftop.c
+++ b/gpdl/tifftop.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 2019-2021 Artifex Software, Inc.
+/* Copyright (C) 2019-2022 Artifex Software, Inc.
    All Rights Reserved.
 
    This software is provided AS-IS with no warranty, either express or
@@ -351,7 +351,7 @@ bytes_until_uel(const stream_cursor_read *pr)
             p++;
         if (p == q)
             break;
-        avail = pr->limit - pr->ptr;
+        avail = q - p;
         if (memcmp(p, "\033%-12345X", min(avail, 9)) == 0) {
             /* At least a partial match to a UEL. Everything up to
              * the start of the match is up for grabs. */