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LibPDF: Scan for PDF file start in first 1024 bytes
Other readers do this too, and files depend on this. Fixes opening these four files from the PDFA 0000.zip dataset: * 0000015.pdf Starts with `C:\web\webeuncet\_cat\_docs\_publics\` before header * 0000408.pdf Starts with UTF-8 BOM * 0000524.pdf Starts with 867 bytes of HTML containing a PHP backtrace * 0000680.pdf Starts with `C:\web\webeuncet\_cat\_docs\_publics\` too
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@ -97,6 +97,12 @@ ByteString Document::text_string_to_utf8(ByteString const& text_string)
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PDFErrorOr<NonnullRefPtr<Document>> Document::create(ReadonlyBytes bytes)
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{
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size_t offset_to_start = TRY(DocumentParser::scan_for_header_start(bytes));
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if (offset_to_start != 0) {
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dbgln("warning: PDF header not at start of file, skipping {} bytes", offset_to_start);
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bytes = bytes.slice(offset_to_start);
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}
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auto parser = adopt_ref(*new DocumentParser({}, bytes));
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auto document = adopt_ref(*new Document(parser));
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