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(PmpFormat.ReadMetaData): refined checking for valid zlib stream.
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@ -47,9 +47,14 @@ namespace GameRes.Formats.ScenePlayer
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public override ImageMetaData ReadMetaData (Stream stream)
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{
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int first = stream.ReadByte();
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if ((first ^ 0x21) != 0x78) // doesn't look like zlib stream
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int first = stream.ReadByte() ^ 0x21;
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if (first != 0x78) // doesn't look like zlib stream
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return null;
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int flg = stream.ReadByte() ^ 0x21;
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int fcheck = first << 8 | flg;
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if (fcheck / 0x1f * 0x1f != fcheck)
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return null;
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stream.Position = 0;
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using (var input = new XoredStream (stream, 0x21, true))
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using (var zstream = new ZLibStream (input, CompressionMode.Decompress))
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