#include <vil_stream_section.h>
Inheritance diagram for vil_stream_section:
It is possible to have multiple vil_stream_sections using the same underlying stream simultaneously. This is accomplished by keeping a note of the current position and seeking a lot.
Note however that this is *not* threadsafe.
Definition at line 21 of file vil_stream_section.h.
Public Member Functions | |
| vil_stream_section (vil_stream *underlying, int begin) | |
| skip to position 'begin' in underlying stream and translate seeks, reads and writes relative to that position into seeks, reads and writes in the underlying stream. | |
| vil_stream_section (vil_stream *underlying, int begin, int end) | |
| as above, but will not allow seeks, reads or writes past 'end'. | |
| bool | ok () const |
| Return false if the stream is broken. | |
| vil_streampos | write (void const *buf, vil_streampos n) |
| Write n bytes from buf. Returns number of bytes written. | |
| vil_streampos | read (void *buf, vil_streampos n) |
| Read n bytes into buf. Returns number of bytes read. | |
| vil_streampos | tell () const |
| Return file pointer. | |
| void | seek (vil_streampos position) |
| Goto file pointer. | |
| vil_streampos | file_size () const |
| Amount of data in the stream. | |
| void | ref () |
| up/down the reference count. | |
| void | unref () |
Protected Member Functions | |
| ~vil_stream_section () | |
Private Attributes | |
| vil_stream * | underlying_ |
| vil_streampos | begin_ |
| vil_streampos | end_ |
| vil_streampos | current_ |
| vil_stream_section::vil_stream_section | ( | vil_stream * | underlying, | |
| int | begin | |||
| ) |
skip to position 'begin' in underlying stream and translate seeks, reads and writes relative to that position into seeks, reads and writes in the underlying stream.
Definition at line 18 of file vil_stream_section.cxx.
| vil_stream_section::vil_stream_section | ( | vil_stream * | underlying, | |
| int | begin, | |||
| int | end | |||
| ) |
as above, but will not allow seeks, reads or writes past 'end'.
Definition at line 29 of file vil_stream_section.cxx.
| vil_stream_section::~vil_stream_section | ( | ) | [protected] |
Definition at line 41 of file vil_stream_section.cxx.
| bool vil_stream_section::ok | ( | ) | const [inline, virtual] |
Return false if the stream is broken.
Implements vil_stream.
Definition at line 34 of file vil_stream_section.h.
| vil_streampos vil_stream_section::write | ( | void const * | buf, | |
| vil_streampos | n | |||
| ) | [virtual] |
Write n bytes from buf. Returns number of bytes written.
The return value is less than n only in case of device failure.
Implements vil_stream.
Definition at line 50 of file vil_stream_section.cxx.
| vil_streampos vil_stream_section::read | ( | void * | buf, | |
| vil_streampos | n | |||
| ) | [virtual] |
Read n bytes into buf. Returns number of bytes read.
The return value is less than n only at eof.
Implements vil_stream.
Definition at line 77 of file vil_stream_section.cxx.
| vil_streampos vil_stream_section::tell | ( | ) | const [inline, virtual] |
| void vil_stream_section::seek | ( | vil_streampos | position | ) | [virtual] |
| vil_streampos vil_stream_section::file_size | ( | ) | const [virtual] |
Amount of data in the stream.
Implements vil_stream.
Definition at line 116 of file vil_stream_section.cxx.
| void vil_stream::ref | ( | ) | [inline, inherited] |
| void vil_stream::unref | ( | ) | [inherited] |
Definition at line 31 of file vil_stream.cxx.
vil_stream* vil_stream_section::underlying_ [private] |
Definition at line 46 of file vil_stream_section.h.
vil_streampos vil_stream_section::begin_ [private] |
Definition at line 47 of file vil_stream_section.h.
vil_streampos vil_stream_section::end_ [private] |
Definition at line 48 of file vil_stream_section.h.
vil_streampos vil_stream_section::current_ [private] |
Definition at line 49 of file vil_stream_section.h.
1.5.1