DCMTK
Version 3.6.9
OFFIS DICOM Toolkit
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pure virtual abstract base class for producers, i.e. More...
Public Member Functions | |
virtual | ~DcmProducer () |
destructor | |
virtual OFBool | good () const =0 |
returns the status of the producer. More... | |
virtual OFCondition | status () const =0 |
returns the status of the producer as an OFCondition object. More... | |
virtual OFBool | eos ()=0 |
returns true if the producer is at the end of stream. More... | |
virtual offile_off_t | avail ()=0 |
returns the minimum number of bytes that can be read with the next call to read(). More... | |
virtual offile_off_t | read (void *buf, offile_off_t buflen)=0 |
reads as many bytes as possible into the given block. More... | |
virtual offile_off_t | skip (offile_off_t skiplen)=0 |
skips over the given number of bytes (or less) More... | |
virtual void | putback (offile_off_t num)=0 |
resets the stream to the position by the given number of bytes. More... | |
pure virtual abstract base class for producers, i.e.
the initial node of a filter chain in an input stream.
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pure virtual |
returns the minimum number of bytes that can be read with the next call to read().
The DcmObject read methods rely on avail to return a value > 0 if there is no I/O suspension since certain data such as tag and length are only read "en bloc", i.e. all or nothing.
Implemented in DcmZLibInputFilter, DcmFileProducer, and DcmBufferProducer.
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pure virtual |
returns true if the producer is at the end of stream.
Implemented in DcmZLibInputFilter, DcmFileProducer, and DcmBufferProducer.
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pure virtual |
returns the status of the producer.
Unless the status is good, the producer will not permit any operation.
Implemented in DcmZLibInputFilter, DcmFileProducer, and DcmBufferProducer.
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pure virtual |
resets the stream to the position by the given number of bytes.
num | number of bytes to putback. If the putback operation fails, the producer status becomes bad. |
Implemented in DcmZLibInputFilter, DcmFileProducer, and DcmBufferProducer.
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pure virtual |
reads as many bytes as possible into the given block.
buf | pointer to memory block, must not be NULL |
buflen | length of memory block |
Implemented in DcmZLibInputFilter, DcmFileProducer, and DcmBufferProducer.
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pure virtual |
skips over the given number of bytes (or less)
skiplen | number of bytes to skip |
Implemented in DcmZLibInputFilter, DcmFileProducer, and DcmBufferProducer.
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pure virtual |
returns the status of the producer as an OFCondition object.
Unless the status is good, the producer will not permit any operation.
Implemented in DcmZLibInputFilter, DcmFileProducer, and DcmBufferProducer.