| DCMTK Version 3.6.9
    OFFIS DICOM Toolkit | 
zlib compression filter for output streams. More...
 Inheritance diagram for DcmZLibOutputFilter:
 Inheritance diagram for DcmZLibOutputFilter:| Public Member Functions | |
| DcmZLibOutputFilter () | |
| default constructor | |
| virtual | ~DcmZLibOutputFilter () | 
| destructor | |
| virtual OFBool | good () const | 
| returns the status of the consumer. | |
| virtual OFCondition | status () const | 
| returns the status of the consumer as an OFCondition object. | |
| virtual OFBool | isFlushed () const | 
| returns true if the consumer is flushed, i.e. | |
| virtual offile_off_t | avail () const | 
| returns the minimum number of bytes that can be written with the next call to write(). | |
| virtual offile_off_t | write (const void *buf, offile_off_t buflen) | 
| processes as many bytes as possible from the given input block. | |
| virtual void | flush () | 
| instructs the consumer to flush its internal content until either the consumer becomes "flushed" or I/O suspension occurs. | |
| virtual void | append (DcmConsumer &consumer) | 
| determines the consumer to which the filter is supposed to write it's output. | |
|  Public Member Functions inherited from DcmOutputFilter | |
| virtual | ~DcmOutputFilter () | 
| destructor | |
|  Public Member Functions inherited from DcmConsumer | |
| virtual | ~DcmConsumer () | 
| destructor | |
| Private Member Functions | |
| DcmZLibOutputFilter (const DcmZLibOutputFilter &) | |
| private unimplemented copy constructor | |
| DcmZLibOutputFilter & | operator= (const DcmZLibOutputFilter &) | 
| private unimplemented copy assignment operator | |
| void | flushOutputBuffer () | 
| writes the content of the output ring buffer to the next filter stage until the output ring buffer becomes empty or the next filter stage becomes full | |
| offile_off_t | compress (const void *buf, offile_off_t buflen, OFBool finalize) | 
| feed data from the given block of data to the compression codec until complete or the output ring buffer becomes full. | |
| offile_off_t | fillInputBuffer (const void *buf, offile_off_t buflen) | 
| copies as much of the given block of data as possible in the input ring buffer | |
| void | compressInputBuffer (OFBool finalize) | 
| feed data from the input ring buffer to the compression codec until complete or the output ring buffer becomes full. | |
| Private Attributes | |
| DcmConsumer * | current_ | 
| pointer to consumer to which compressed output is written | |
| z_streamp | zstream_ | 
| pointer to struct z_stream object containing the zlib status | |
| OFCondition | status_ | 
| status | |
| OFBool | flushed_ | 
| true if the zlib object has reported Z_STREAM_END | |
| unsigned char * | inputBuf_ | 
| input ring buffer | |
| offile_off_t | inputBufStart_ | 
| offset of first byte in input ring buffer | |
| offile_off_t | inputBufCount_ | 
| number of bytes in input ring buffer | |
| unsigned char * | outputBuf_ | 
| output ring buffer | |
| offile_off_t | outputBufStart_ | 
| offset of first byte in output ring buffer | |
| offile_off_t | outputBufCount_ | 
| number of bytes in output ring buffer | |
zlib compression filter for output streams.
| 
 | virtual | 
determines the consumer to which the filter is supposed to write it's output.
Once a consumer for the output filter has been defined, it cannot be changed anymore during the lifetime of the object.
| consumer | reference to consumer, must not be circular chain | 
Implements DcmOutputFilter.
| 
 | virtual | 
returns the minimum number of bytes that can be written with the next call to write().
The DcmObject write 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 written "en bloc", i.e. all or nothing.
Implements DcmConsumer.
| 
 | private | 
feed data from the given block of data to the compression codec until complete or the output ring buffer becomes full.
Does not flush the output ring buffer.
| buf | pointer to input data | 
| buflen | number of bytes in buf | 
| finalize | true if the current block of data constitutes the end of the input stream, i.e. the compression codec should be forced to flush its internal state. | 
| 
 | private | 
feed data from the input ring buffer to the compression codec until complete or the output ring buffer becomes full.
Does not flush the output ring buffer.
| finalize | true if the content of the input ring buffer constitutes the end of the input stream, i.e. the compression codec should be forced to flush its internal state. | 
| 
 | private | 
copies as much of the given block of data as possible in the input ring buffer
| buf | pointer to input data | 
| buflen | number of bytes in buf | 
| 
 | virtual | 
instructs the consumer to flush its internal content until either the consumer becomes "flushed" or I/O suspension occurs.
After a call to flush(), a call to write() will produce undefined behaviour.
Implements DcmConsumer.
| 
 | virtual | 
returns the status of the consumer.
Unless the status is good, the consumer will not permit any operation.
Implements DcmConsumer.
| 
 | virtual | 
returns true if the consumer is flushed, i.e.
has no more data pending in it's internal state that needs to be flushed before the stream is closed.
Implements DcmConsumer.
| 
 | virtual | 
returns the status of the consumer as an OFCondition object.
Unless the status is good, the consumer will not permit any operation.
Implements DcmConsumer.
| 
 | virtual | 
processes as many bytes as possible from the given input block.
| buf | pointer to memory block, must not be NULL | 
| buflen | length of memory block | 
Implements DcmConsumer.