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Fix #417: search acTL chunk by block, instead of byte-by-byte

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This commit is contained in:
Paddy Xu
2018-11-01 23:58:51 +02:00
parent 6768f44c8b
commit 69c46620ad
1 changed files with 19 additions and 3 deletions
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22
QuickLook.Plugin/QuickLook.Plugin.ImageViewer/AnimatedImage/APNGAnimationProvider.cs
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@@ -179,9 +179,18 @@ namespace QuickLook.Plugin.ImageViewer.AnimatedImage
{
using (var br = new BinaryReader(new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite)))
{
while (br.BaseStream.Length - br.BaseStream.Position >= 4)
if (br.BaseStream.Length < 8 + 4)
return false;
uint nextChunk = 8; // skip header
while (nextChunk > 0 && nextChunk < br.BaseStream.Length)
{
var window = br.ReadBytes(4);
br.BaseStream.Position = nextChunk;
var data_size = ToUInt32BE(br.ReadBytes(4)); // data size in BE
var window = br.ReadBytes(4); // label
if (window[0] == 'I' && window[1] == 'D' && window[2] == 'A' && window[3] == 'T')
return false;
@@ -189,11 +198,18 @@ namespace QuickLook.Plugin.ImageViewer.AnimatedImage
if (window[0] == 'a' && window[1] == 'c' && window[2] == 'T' && window[3] == 'L')
return true;
br.BaseStream.Position -= 3;
// *[Data Size] + Data Size + Label + CRC
nextChunk += data_size + 4 + 4 + 4;
}
return false;
}
uint ToUInt32BE(byte[] data)
{
Array.Reverse(data);
return BitConverter.ToUInt32(data, 0);
}
}
private class FrameInfo