Fixed PNG compressed iTXt chunk

drewnoakes · May 5, 2024 · f0e3ae6 · f0e3ae6
1 parent ed79cc0
commit f0e3ae6
Showing 1 changed file with 3 additions and 1 deletion.
diff --git 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}");