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This fixes PHP bug #73155: https://bugs.php.net/bug.php?id=73155
Patch adapted from upstream source repository:
https://github.com/libgd/libgd/commit/8067a8ac336dfe0acbe96ec2eb24572209a7f279
(.gitignore change removed)
From 8067a8ac336dfe0acbe96ec2eb24572209a7f279 Mon Sep 17 00:00:00 2001
From: "Christoph M. Becker" <cmbecker69@gmx.de>
Date: Fri, 23 Sep 2016 18:29:52 +0200
Subject: [PATCH] Fix #309: gdImageGd2() writes wrong chunk sizes on boundaries
(cherry picked from commit bb1998a16e30d542ab22eba5501911a9aa066edb)
---
src/gd_gd2.c | 4 ++--
tests/gd2/CMakeLists.txt | 1 +
tests/gd2/Makemodule.am | 1 +
tests/gd2/bug00309.c | 37 +++++++++++++++++++++++++++++++++++++
4 files changed, 41 insertions(+), 2 deletions(-)
create mode 100644 tests/gd2/bug00309.c
diff --git a/src/gd_gd2.c b/src/gd_gd2.c
index 75e5e1f..b9b2f93 100644
--- a/src/gd_gd2.c
+++ b/src/gd_gd2.c
@@ -938,8 +938,8 @@ _gdImageGd2 (gdImagePtr im, gdIOCtx * out, int cs, int fmt)
};
/* Work out number of chunks. */
- ncx = im->sx / cs + 1;
- ncy = im->sy / cs + 1;
+ ncx = (im->sx + cs - 1) / cs;
+ ncy = (im->sy + cs - 1) / cs;
/* Write the standard header. */
_gd2PutHeader (im, out, cs, fmt, ncx, ncy);
diff --git a/tests/gd2/CMakeLists.txt b/tests/gd2/CMakeLists.txt
index 3b650ad..247b466 100644
--- a/tests/gd2/CMakeLists.txt
+++ b/tests/gd2/CMakeLists.txt
@@ -1,5 +1,6 @@
SET(TESTS_FILES
bug_289
+ bug00309
gd2_empty_file
gd2_im2im
gd2_null
diff --git a/tests/gd2/Makemodule.am b/tests/gd2/Makemodule.am
index b8ee946..d69aee0 100644
--- a/tests/gd2/Makemodule.am
+++ b/tests/gd2/Makemodule.am
@@ -1,5 +1,6 @@
libgd_test_programs += \
gd2/bug_289 \
+ gd2/bug00309 \
gd2/gd2_empty_file \
gd2/php_bug_72339 \
gd2/gd2_read_corrupt
diff --git a/tests/gd2/bug00309.c b/tests/gd2/bug00309.c
new file mode 100644
index 0000000..b649cdc
--- /dev/null
+++ b/tests/gd2/bug00309.c
@@ -0,0 +1,37 @@
+/**
+ * Regression test for <https://github.com/libgd/libgd/issues/309>.
+ *
+ * We test that an image with 64x64 pixels reports only a single chunk in the
+ * GD2 image header when the chunk size is 64.
+ */
+
+
+#include "gd.h"
+#include "gdtest.h"
+
+
+int main()
+{
+ gdImagePtr im;
+ unsigned char *buf;
+ int size, word;
+
+ im = gdImageCreate(64, 64);
+ gdImageColorAllocate(im, 0, 0, 0);
+
+ buf = gdImageGd2Ptr(im, 64, 1, &size);
+
+ gdImageDestroy(im);
+
+ word = buf[10] << 8 | buf[11];
+ gdTestAssertMsg(word == 64, "chunk size is %d, but expected 64\n", word);
+ word = buf[14] << 8 | buf[15];
+ gdTestAssertMsg(word == 1, "x chunk count is %d, but expected 1\n", word);
+ word = buf[16] << 8 | buf[17];
+ gdTestAssertMsg(word == 1, "y chunk count is %d, but expected 1\n", word);
+ gdTestAssertMsg(size == 5145, "file size is %d, but expected 5145\n", size);
+
+ gdFree(buf);
+
+ return gdNumFailures();
+}
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