From 1f5e8a462908a7c6e7eac5b53c70749837d29c64 Mon Sep 17 00:00:00 2001
From: floydinator-git <78954063+floydinator-git@users.noreply.github.com>
Date: Tue, 10 Sep 2024 23:04:09 -0400
Subject: Fix ImageMetadataDatabase::calculateImageSize calling
 Image::readPngMetadata on non-PNG images.

---
 source/core/StarImage.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'source/core/StarImage.cpp')

diff --git a/source/core/StarImage.cpp b/source/core/StarImage.cpp
index 82e3b05..52c2370 100644
--- a/source/core/StarImage.cpp
+++ b/source/core/StarImage.cpp
@@ -17,6 +17,12 @@ void readPngData(png_structp pngPtr, png_bytep data, png_size_t length) {
   ((IODevice*)png_get_io_ptr(pngPtr))->readFull((char*)data, length);
 };
 
+bool Image::isPng(IODevicePtr device) {
+  png_byte header[8];
+  device->readAbsolute(0, (char*)header, sizeof(header));
+  return !png_sig_cmp(header, 0, sizeof(header));
+}
+
 Image Image::readPng(IODevicePtr device) {
   png_byte header[8];
   device->readFull((char*)header, sizeof(header));
-- 
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