From f0e3ae646552eb481269954c25c811ef3076c901 Mon Sep 17 00:00:00 2001
From: Daniel Helsing <reinfallt@gmail.com>
Date: Sun, 5 May 2024 14:43:06 +0200
Subject: [PATCH] Fixed PNG compressed iTXt chunk

---
 MetadataExtractor/Formats/Png/PngMetadataReader.cs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/MetadataExtractor/Formats/Png/PngMetadataReader.cs b/MetadataExtractor/Formats/Png/PngMetadataReader.cs
index ad4ecb46c..4601fbc9f 100644
--- a/MetadataExtractor/Formats/Png/PngMetadataReader.cs
+++ b/MetadataExtractor/Formats/Png/PngMetadataReader.cs
@@ -264,7 +264,9 @@ private static IEnumerable<Directory> ProcessChunk(PngChunk chunk)
                 {
                     if (compressionMethod == 0)
                     {
-                        if (!TryDeflate(bytes, bytesLeft, out textBytes, out string? errorMessage))
+                        reader.Skip(2); // Skip over the zlib header bytes (78 9C)
+                        bytesLeft -= 2;
+                        if (!TryDeflate(reader.GetBytes(bytesLeft), bytesLeft, out textBytes, out string? errorMessage))
                         {
                             var directory = new PngDirectory(PngChunkType.iTXt);
                             directory.AddError($"Exception decompressing PNG {nameof(PngChunkType.iTXt)} chunk with keyword \"{keyword}\": {errorMessage}");