From 9df51b51b8d0724159e64c28a294d217de036184 Mon Sep 17 00:00:00 2001
From: Kae <80987908+Novaenia@users.noreply.github.com>
Date: Thu, 12 Sep 2024 23:06:13 +1000
Subject: fix windows pread and pwrite bug

reading without a byte offset specified can affect absolute reads afterward, this is a workaround (thanks windows...)
---
 source/core/StarImage.cpp | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

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

diff --git a/source/core/StarImage.cpp b/source/core/StarImage.cpp
index 52c2370..c7d4962 100644
--- a/source/core/StarImage.cpp
+++ b/source/core/StarImage.cpp
@@ -18,13 +18,12 @@ void readPngData(png_structp pngPtr, png_bytep data, png_size_t 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));
+  png_byte header[8]{};
+  return !png_sig_cmp(header, 0, device->readAbsolute(0, (char*)header, sizeof(header)));
 }
 
 Image Image::readPng(IODevicePtr device) {
-  png_byte header[8];
+  png_byte header[8]{};
   device->readFull((char*)header, sizeof(header));
 
   if (png_sig_cmp(header, 0, sizeof(header)))
-- 
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