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(BMP): support ancient header format.

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This commit is contained in:
morkt 2017-03-29 08:51:53 +04:00
parent fd4563c812
commit 2c7b82535e
1 changed files with 17 additions and 6 deletions
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23
GameRes/ImageBMP.cs
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@ -114,19 +114,30 @@ namespace GameRes
if ('B' != c1 || 'M' != c2)
return null;
uint size = file.ReadUInt32();
if (size < 14+40)
SkipBytes (file, 8);
uint header_size = file.ReadUInt32();
if (size < 14+header_size)
{
// some otherwise valid bitmaps have size field set to zero
if (size != 0 || !file.AsStream.CanSeek)
return null;
size = (uint)file.Length;
}
SkipBytes (file, 8);
uint header_size = file.ReadUInt32();
if (header_size < 40 || size-14 < header_size)
uint width, height;
if (0xC == header_size)
{
width = file.ReadUInt16();
height = file.ReadUInt16();
}
else if (header_size < 40 || size-14 < header_size)
{
return null;
uint width = file.ReadUInt32();
uint height = file.ReadUInt32();
}
else
{
width = file.ReadUInt32();
height = file.ReadUInt32();
}
file.ReadInt16();
int bpp = file.ReadInt16();
return new BmpMetaData {