From 838ae016d78b4af48a1f9a837e8c2eb6564defb4 Mon Sep 17 00:00:00 2001
From: Nikita Popov <nikita.ppv@gmail.com>
Date: Tue, 9 Feb 2021 15:15:20 +0100
Subject: Make imagegd $file parameter nullable

It is explicitly documented to be nullable, and this matches other
functions like imagepng. It is also documented to accept a stream,
which it currently does not...
---
 ext/gd/gd.c         | 22 +++++++++-------------
 ext/gd/gd.stub.php  |  4 ++--
 ext/gd/gd_arginfo.h |  6 +++---
 3 files changed, 14 insertions(+), 18 deletions(-)

diff --git a/ext/gd/gd.c b/ext/gd/gd.c
index 7a50fb423e..c1329d13cf 100644
--- a/ext/gd/gd.c
+++ b/ext/gd/gd.c
@@ -1778,7 +1778,6 @@ static void _php_image_output(INTERNAL_FUNCTION_PARAMETERS, int image_type, char
 	char *file = NULL;
 	zend_long quality = 0, type = 0;
 	gdImagePtr im;
-	char *fn = NULL;
 	FILE *fp;
 	size_t file_len = 0;
 	int argc = ZEND_NUM_ARGS();
@@ -1786,28 +1785,25 @@ static void _php_image_output(INTERNAL_FUNCTION_PARAMETERS, int image_type, char
 
 	/* The quality parameter for gd2 stands for chunk size */
 
-	if (zend_parse_parameters(argc, "O|pll", &imgind, gd_image_ce, &file, &file_len, &quality, &type) == FAILURE) {
+	if (zend_parse_parameters(argc, "O|p!ll", &imgind, gd_image_ce, &file, &file_len, &quality, &type) == FAILURE) {
 		RETURN_THROWS();
 	}
 
 	im = php_gd_libgdimageptr_from_zval_p(imgind);
 
-	if (argc > 1) {
-		fn = file;
-		if (argc >= 3) {
-			q = quality;
-			if (argc == 4) {
-				t = type;
-			}
+	if (argc >= 3) {
+		q = quality;
+		if (argc == 4) {
+			t = type;
 		}
 	}
 
-	if (argc >= 2 && file_len) {
-		PHP_GD_CHECK_OPEN_BASEDIR(fn, "Invalid filename");
+	if (file_len) {
+		PHP_GD_CHECK_OPEN_BASEDIR(file, "Invalid filename");
 
-		fp = VCWD_FOPEN(fn, "wb");
+		fp = VCWD_FOPEN(file, "wb");
 		if (!fp) {
-			php_error_docref(NULL, E_WARNING, "Unable to open \"%s\" for writing", fn);
+			php_error_docref(NULL, E_WARNING, "Unable to open \"%s\" for writing", file);
 			RETURN_FALSE;
 		}
 
diff --git a/ext/gd/gd.stub.php b/ext/gd/gd.stub.php
index fe0d5658ee..27290ff4ab 100644
--- a/ext/gd/gd.stub.php
+++ b/ext/gd/gd.stub.php
@@ -124,9 +124,9 @@ function imagejpeg(GdImage $image, $file = null, int $quality = -1): bool {}
 /** @param resource|string|null $file */
 function imagewbmp(GdImage $image, $file = null, ?int $foreground_color = null): bool {}
 
-function imagegd(GdImage $image, string $file = UNKNOWN): bool {}
+function imagegd(GdImage $image, ?string $file = null): bool {}
 
-function imagegd2(GdImage $image, string $file = UNKNOWN, int $chunk_size = UNKNOWN, int $mode = UNKNOWN): bool {}
+function imagegd2(GdImage $image, ?string $file = null, int $chunk_size = UNKNOWN, int $mode = UNKNOWN): bool {}
 
 #ifdef HAVE_GD_BMP
 /** @param resource|string|null $file */
diff --git a/ext/gd/gd_arginfo.h b/ext/gd/gd_arginfo.h
index 4d59767b4e..4baeccace3 100644
--- a/ext/gd/gd_arginfo.h
+++ b/ext/gd/gd_arginfo.h
@@ -1,5 +1,5 @@
 /* This is a generated file, edit the .stub.php file instead.
- * Stub hash: 59256d0de105f1a2f5d5fc1e20f8090031b42a76 */
+ * Stub hash: 63898b501cc3ae38585fe0c6f70a9f7865fbee4d */
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_gd_info, 0, 0, IS_ARRAY, 0)
 ZEND_END_ARG_INFO()
@@ -238,12 +238,12 @@ ZEND_END_ARG_INFO()
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_imagegd, 0, 1, _IS_BOOL, 0)
 	ZEND_ARG_OBJ_INFO(0, image, GdImage, 0)
-	ZEND_ARG_TYPE_INFO(0, file, IS_STRING, 0)
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, file, IS_STRING, 1, "null")
 ZEND_END_ARG_INFO()
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_imagegd2, 0, 1, _IS_BOOL, 0)
 	ZEND_ARG_OBJ_INFO(0, image, GdImage, 0)
-	ZEND_ARG_TYPE_INFO(0, file, IS_STRING, 0)
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, file, IS_STRING, 1, "null")
 	ZEND_ARG_TYPE_INFO(0, chunk_size, IS_LONG, 0)
 	ZEND_ARG_TYPE_INFO(0, mode, IS_LONG, 0)
 ZEND_END_ARG_INFO()
-- 
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