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handle ei end image token appearing in inline image data

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This commit is contained in:
Eliot Jones
2019-12-19 16:29:44 +00:00
parent 528df5c396
commit 82c2ee7026
1 changed files with 49 additions and 2 deletions
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51
src/UglyToad.PdfPig/Tokenization/Scanner/CoreTokenScanner.cs
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@@ -217,14 +217,61 @@
var startsAt = inputBytes.CurrentOffset - 2;
const byte lastPlainText = 127;
const byte space = 32;
var imageData = new List<byte>();
byte prevByte = 0;
while (inputBytes.MoveNext())
{
if (inputBytes.CurrentByte == 'I' && prevByte == 'E')
{
imageData.RemoveAt(imageData.Count - 1);
return imageData;
// Check for EI appearing in binary data.
var buffer = new byte[6];
var currentOffset = inputBytes.CurrentOffset;
var read = inputBytes.Read(buffer);
var isEnd = true;
if (read == buffer.Length)
{
for (var i = 0; i < buffer.Length; i++)
{
var b = buffer[i];
if (ReadHelper.IsWhitespace(b))
{
continue;
}
if (b > lastPlainText)
{
isEnd = false;
break;
}
if (b < space && b != '\r' && b != '\n' && b != '\t')
{
isEnd = false;
break;
}
}
}
inputBytes.Seek(currentOffset);
if (isEnd)
{
imageData.RemoveAt(imageData.Count - 1);
return imageData;
}
else
{
}
}
imageData.Add(inputBytes.CurrentByte);