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(TifFormat): precaution against ill-formed files.

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This commit is contained in:
morkt 2016-12-17 06:08:02 +04:00
parent 82bfbd7398
commit 428214182d
1 changed files with 8 additions and 8 deletions
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16
GameRes/ImageTIFF.cs
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@ -2,7 +2,7 @@
//! \date Mon Jul 07 06:39:45 2014
//! \brief TIFF image implementation.
//
// Copyright (C) 2014 by morkt
// Copyright (C) 2014-2016 by morkt
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
@ -29,6 +29,7 @@ using System.Text;
using System.ComponentModel.Composition;
using System.Windows.Media.Imaging;
using GameRes.Utility;
using System.Collections.Generic;
namespace GameRes
{
@ -165,10 +166,12 @@ namespace GameRes
{
MetaParsed parsed = MetaParsed.None;
int width = 0, height = 0, bpp = 0, pos_x = 0, pos_y = 0;
var seen_ifd = new HashSet<uint>();
uint ifd = m_first_ifd;
while (ifd != 0 && parsed != MetaParsed.Complete)
while (ifd != 0 && parsed != MetaParsed.Complete && !seen_ifd.Contains (ifd))
{
m_file.Position = ifd;
seen_ifd.Add (ifd);
uint tag_count = ReadUInt16();
ifd += 2;
for (uint i = 0; i < tag_count && parsed != MetaParsed.Complete; ++i)
@ -222,10 +225,7 @@ namespace GameRes
ifd += 12;
m_file.Position = ifd;
}
uint ifd_next = ReadUInt32();
if (ifd_next == ifd)
break;
ifd = ifd_next;
ifd = ReadUInt32();
}
if (MetaParsed.Sufficient == (parsed & MetaParsed.Sufficient))
return new ImageMetaData() {
@ -327,7 +327,7 @@ namespace GameRes
value = 0;
return false;
}
if (m_is_bigendian)
if (m_is_bigendian ^ !BitConverter.IsLittleEndian)
Array.Reverse (convert_buffer);
value = (int)BitConverter.ToSingle (convert_buffer, 0);
return true;
@ -341,7 +341,7 @@ namespace GameRes
value = 0;
return false;
}
if (m_is_bigendian)
if (m_is_bigendian ^ !BitConverter.IsLittleEndian)
Array.Reverse (convert_buffer);
long bits = BitConverter.ToInt64 (convert_buffer, 0);
value = (int)BitConverter.Int64BitsToDouble (bits);