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(PmpFormat.ReadMetaData): refined checking for valid zlib stream.

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This commit is contained in:
morkt 2015-05-01 09:24:57 +04:00
parent 6e0a1ceff5
commit 7b1d5dc2f9
1 changed files with 7 additions and 2 deletions
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9
ArcFormats/ImagePMP.cs
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@ -47,9 +47,14 @@ namespace GameRes.Formats.ScenePlayer
public override ImageMetaData ReadMetaData (Stream stream)
{
int first = stream.ReadByte();
if ((first ^ 0x21) != 0x78) // doesn't look like zlib stream
int first = stream.ReadByte() ^ 0x21;
if (first != 0x78) // doesn't look like zlib stream
return null;
int flg = stream.ReadByte() ^ 0x21;
int fcheck = first << 8 | flg;
if (fcheck / 0x1f * 0x1f != fcheck)
return null;
stream.Position = 0;
using (var input = new XoredStream (stream, 0x21, true))
using (var zstream = new ZLibStream (input, CompressionMode.Decompress))