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Fixed PNG compressed iTXt chunk #422

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Fixed PNG compressed iTXt chunk #422

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4 changes: 3 additions & 1 deletion MetadataExtractor/Formats/Png/PngMetadataReader.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -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}");
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