FEAT: Text stream validation for literals #988
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- added `PdfTextStream` class to handle: - detection of a text stream between `BT` and `ET` operators; - distinguish between hex streams (not validated yet) and string literals; - balance parenthesis in string literals while accounting for escaped characters; - added two new PDF error messages: - `PDF-HUL-163` IO Exception reading text stream; - `PDF-HUL-164` Unbalanced parentheses in text stream; - added a first cut function for walking pagesfor validation: `PdfModule:checkPageTextStreams`; - added method to check text streams: `PageObject:checkTextStreams`; - tidied up page content stream handling, empty lists are safer than nulls; - check page text streams after font finding; - removed unnecessary param from filter extraction; - fixed minor issue in header handling that terminated processing early for invalid files; and - added test files for the above.
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PdfTextStreamclass to handle:BTandEToperators;PDF-HUL-163IO Exception reading text stream;PDF-HUL-164Unbalanced parentheses in text stream;PdfModule:checkPageTextStreams;PageObject:checkTextStreams;