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support named tounicode cmaps rather than streams type 0 fonts

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tounicode cmap may refer to a known cmap name rather than an embedded cmap stream.
This commit is contained in:
Eliot Jones
2020-01-14 14:58:20 +00:00
parent a36f5a3af3
commit f6e12f40d8
1 changed files with 15 additions and 6 deletions
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21
src/UglyToad.PdfPig/PdfFonts/Parser/Handlers/Type0FontHandler.cs
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@@ -64,13 +64,22 @@
{
var toUnicodeValue = dictionary.Data[NameToken.ToUnicode];
var toUnicode = DirectObjectFinder.Get<StreamToken>(toUnicodeValue, scanner);
var decodedUnicodeCMap = toUnicode?.Decode(filterProvider);
if (decodedUnicodeCMap != null)
if (DirectObjectFinder.TryGet<StreamToken>(toUnicodeValue, scanner, out var toUnicodeStream))
{
toUnicodeCMap = CMapCache.Parse(new ByteArrayInputBytes(decodedUnicodeCMap), isLenientParsing);
var decodedUnicodeCMap = toUnicodeStream?.Decode(filterProvider);
if (decodedUnicodeCMap != null)
{
toUnicodeCMap = CMapCache.Parse(new ByteArrayInputBytes(decodedUnicodeCMap), isLenientParsing);
}
}
else if (DirectObjectFinder.TryGet<NameToken>(toUnicodeValue, scanner, out var toUnicodeName))
{
toUnicodeCMap = CMapCache.Get(toUnicodeName.Data);
}
else
{
throw new PdfDocumentFormatException($"Invalid type of toUnicode CMap encountered. Got: {toUnicodeValue}.");
}
}