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JBIG2 - basic reading of segments

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Jakub Melka
2019-10-26 18:02:37 +02:00
parent ee4e21320e
commit abbe7a920a
5 changed files with 385 additions and 6 deletions
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17
PdfForQtLib/sources/pdfutils.h
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@ -96,6 +96,12 @@ public:
explicit PDFBitReader(const QByteArray* stream, Value bitsPerComponent);
PDFBitReader(const PDFBitReader&) = default;
PDFBitReader(PDFBitReader&&) = default;
PDFBitReader& operator=(const PDFBitReader&) = default;
PDFBitReader& operator=(PDFBitReader&&) = default;
/// Returns maximal value of n-bit unsigned integer.
Value max() const { return m_maximalValue; }
@ -116,18 +122,25 @@ public:
/// then exception is thrown.
void seek(qint64 position);
/// Skips desired number of bytes
void skipBytes(Value bytes);
/// Seeks data to the byte boundary (number of processed bits is divisible by 8)
void alignToBytes();
/// Returns true, if we are at the end of the data stream (no more data can be read)
bool isAtEnd() const;
/// Returns position in the data stream (byte position, not bit position, so
/// result of this function is sometimes inaccurate)
int getPosition() const { return m_position; }
private:
const QByteArray* m_stream;
int m_position;
const Value m_bitsPerComponent;
const Value m_maximalValue;
Value m_bitsPerComponent;
Value m_maximalValue;
Value m_buffer;
Value m_bitsInBuffer;