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(PngFormat.ReadMetaData): additional sanity checks.

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This commit is contained in:
morkt 2017-07-17 11:04:39 +04:00
parent 3ad1c60dde
commit ad16b754ae
1 changed files with 4 additions and 1 deletions
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5
GameRes/ImagePNG.cs
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@ -129,6 +129,8 @@ namespace GameRes
meta.Width = Binary.BigEndian (file.ReadUInt32()); meta.Width = Binary.BigEndian (file.ReadUInt32());
meta.Height = Binary.BigEndian (file.ReadUInt32()); meta.Height = Binary.BigEndian (file.ReadUInt32());
int bpp = file.ReadByte(); int bpp = file.ReadByte();
if (bpp != 1 && bpp != 2 && bpp != 4 && bpp != 8 && bpp != 16)
return null;
int color_type = file.ReadByte(); int color_type = file.ReadByte();
switch (color_type) switch (color_type)
{ {
@ -136,7 +138,8 @@ namespace GameRes
case 3: meta.BPP = 24; break; case 3: meta.BPP = 24; break;
case 4: meta.BPP = bpp*2; break; case 4: meta.BPP = bpp*2; break;
case 6: meta.BPP = bpp*4; break; case 6: meta.BPP = bpp*4; break;
default: meta.BPP = bpp; break; case 0: meta.BPP = bpp; break;
default: return null;
} }
SkipBytes (file, 7); SkipBytes (file, 7);