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Parsing X Reference table

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Jakub Melka
2018-11-21 19:30:15 +01:00
parent 58ad59e407
commit 8c93c82228
19 changed files with 625 additions and 58 deletions
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15
PdfForQtLib/sources/pdfdocumentreader.cpp
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@ -19,6 +19,7 @@
#include "pdfdocumentreader.h"
#include "pdfparser.h"
#include "pdfconstants.h"
#include "pdfxreftable.h"
#include <QFile>
@ -114,6 +115,15 @@ PDFDocument PDFDocumentReader::readFromBuffer(const QByteArray& buffer)
throw PDFParserException(tr("Start of object reference table not found."));
}
Q_ASSERT(startXRefPosition + std::strlen(PDF_START_OF_XREF_MARK) < buffer.size());
PDFLexicalAnalyzer analyzer(buffer.constData() + startXRefPosition + std::strlen(PDF_START_OF_XREF_MARK), buffer.constData() + buffer.size());
const PDFLexicalAnalyzer::Token token = analyzer.fetch();
if (token.type != PDFLexicalAnalyzer::TokenType::Integer)
{
throw PDFParserException(tr("Start of object reference table not found."));
}
const PDFInteger firstXrefTableOffset = token.data.toLongLong();
// HEADER CHECKING
// 1) Check if header is present
// 2) Scan header version
@ -123,7 +133,7 @@ PDFDocument PDFDocumentReader::readFromBuffer(const QByteArray& buffer)
// - %!PS-Adobe-y.y PDF-x.x
// We will search for both of these formats.
std::regex headerRegExp("(%PDF-[[:digit:]]\\.[[:digit:]])|(%!PS-Adobe-[[:digit:]]\\.[[:digit:]] PDF-[[:digit:]]\\.[[:digit:]])");
std::regex headerRegExp(PDF_FILE_HEADER_REGEXP);
std::cmatch headerMatch;
auto itBegin = buffer.cbegin();
@ -156,6 +166,9 @@ PDFDocument PDFDocumentReader::readFromBuffer(const QByteArray& buffer)
throw PDFParserException(tr("Version of the PDF file is not valid."));
}
// Now, we are ready to scan xref table
PDFXRefTable xrefTable;
xrefTable.readXRefTable(nullptr, buffer, firstXrefTableOffset);
}
catch (PDFParserException parserException)