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#ifndef LEOUTPUTSTREAM_H |
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#define LEOUTPUTSTREAM_H |
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|
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#include "leinputstream.h" |
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|
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class LEOutputStream { |
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private: |
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QIODevice* output; |
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QDataStream data; |
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|
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qint8 bitfieldpos; |
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quint8 bitfield; |
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|
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void writeBits(quint8 n, quint8 v) { |
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bitfield = v << bitfieldpos | bitfield; |
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bitfieldpos += n; |
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if (bitfieldpos == 8) { |
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data << bitfield; |
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bitfield = 0; |
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bitfieldpos = 0; |
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} else if (bitfieldpos > 8) { |
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throw IOException("Bitfield does not have enough bits left."); |
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} |
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} |
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|
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void checkForLeftOverBits() const { |
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if (bitfieldpos != 0) { |
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throw IOException( |
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"Cannot read this type halfway through a bit operation."); |
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} |
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} |
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|
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public: |
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|
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LEOutputStream(QIODevice* out) :output(out), data(out) { |
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bitfield = 0; |
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bitfieldpos = 0; |
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data.setByteOrder(QDataStream::LittleEndian); |
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} |
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|
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void writebit(bool v) { |
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writeBits(1, (v) ?1 :0); |
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} |
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|
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void writeuint2(quint8 v) { |
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writeBits(2, v); |
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} |
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|
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void writeuint3(quint8 v) { |
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writeBits(3, v); |
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} |
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|
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void writeuint4(quint8 v) { |
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writeBits(4, v); |
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} |
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|
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void writeuint5(quint8 v) { |
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writeBits(5, v); |
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} |
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|
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void writeuint6(quint8 v) { |
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writeBits(6, v); |
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} |
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|
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void writeuint7(quint8 v) { |
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writeBits(7, v); |
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} |
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|
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void writeuint9(quint16 v) { |
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data << (quint8) v; |
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writeBits(1, v >> 8); |
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} |
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|
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void writeuint12(quint16 v) { |
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writeBits(4, v); |
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data << (quint8)(v >> 4); |
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} |
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|
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void writeuint13(quint16 v) { |
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writeBits(5, v); |
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data << (quint8)(v >> 5); |
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} |
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|
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void writeuint14(quint16 v) { |
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if (bitfieldpos == 0) { |
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data << (quint8) v; |
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writeBits(6, v >> 8); |
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} else if (bitfieldpos == 2) { |
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writeBits(6, v); |
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data << (quint8)(v >> 6); |
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} else { |
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throw IOException( |
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"Cannot write this type halfway through a bit operation."); |
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} |
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} |
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|
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void writeuint15(quint16 v) { |
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// we assume there are 7 bits left |
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writeBits(7, v); |
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data << (quint8)(v >> 7); |
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} |
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|
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void writeuint20(quint32 v) { |
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if (bitfieldpos == 0) { |
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data << (quint8) v; |
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data << (quint8)(v >> 8); |
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writeBits(4, v >> 16); |
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} else if (bitfieldpos == 4) { |
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writeBits(4, v); |
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data << (quint8)(v >> 4); |
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data << (quint8)(v >> 12); |
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} else { |
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throw IOException( |
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"Cannot write this type halfway through a bit operation."); |
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} |
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} |
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|
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void writeuint30(quint32 v) { |
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checkForLeftOverBits(); |
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data << (quint8) v; |
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data << (quint8)(v >> 8); |
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data << (quint8)(v >> 16); |
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writeBits(6, v >> 24); |
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} |
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|
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void writeuint8(quint8 v) { |
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checkForLeftOverBits(); |
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data << v; |
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} |
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|
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void writeint16(qint16 v) { |
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checkForLeftOverBits(); |
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data << v; |
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} |
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|
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void writeuint16(quint16 v) { |
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checkForLeftOverBits(); |
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data << v; |
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} |
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|
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void writeuint32(quint32 v) { |
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checkForLeftOverBits(); |
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data << v; |
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} |
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|
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void writeint32(qint32 v) { |
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checkForLeftOverBits(); |
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data << v; |
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} |
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|
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void writeBytes(const QByteArray& b) { |
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int offset = 0; |
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int todo = b.size(); |
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do { |
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int nwritten = data.writeRawData(b.data() + offset, todo); |
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if (nwritten == -1) return; //TODO report error |
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todo -= nwritten; |
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offset += nwritten; |
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} while (todo > 0); |
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} |
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|
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quint64 getPosition() const { return output->pos(); } |
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}; |
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|
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#endif |
