GzipIfstream Class Reference

Decompresses files which are compressed in the gzip format (*.gzip) More...

#include <OpenMS/FORMAT/GzipIfstream.h>

Collaboration diagram for GzipIfstream:

Public Member Functions
	GzipIfstream ()
	Default Constructor. More...
	GzipIfstream (const char *filename)
	Detailed constructor with filename. More...
virtual	~GzipIfstream ()
	Destructor. More...
size_t	read (char *s, size_t n)
	Reads n bytes from the bzip2 compressed file into buffer s. More...
bool	streamEnd () const
	indicates whether the read function can be used safely More...
bool	isOpen () const
	returns whether a file is open. More...
void	open (const char *filename)
	opens a file for reading (decompression) More...
void	close ()
	closes current file. More...

Protected Member Functions
	GzipIfstream (const GzipIfstream &bzip2)
	not implemented More...
GzipIfstream &	operator= (const GzipIfstream &bzip2)

Protected Attributes
gzFile	gzfile_
	a gzFile object(void*) . Necessary for decompression More...
int	n_buffer_
	counts the last read duffer More...
int	gzerror_
	saves the last returned error by the read function More...
bool	stream_at_end_
	true if end of file is reached More...

Detailed Description

Decompresses files which are compressed in the gzip format (*.gzip)

Constructor & Destructor Documentation

GzipIfstream() [1/3]

GzipIfstream

(

)

Default Constructor.

GzipIfstream() [2/3]

GzipIfstream ( const char *  filename )

explicit

Detailed constructor with filename.

~GzipIfstream()

virtual ~GzipIfstream ( )

virtual

Destructor.

GzipIfstream() [3/3]

GzipIfstream ( const GzipIfstream &  bzip2 )

protected

not implemented

Member Function Documentation

close()

void close

(

)

closes current file.

isOpen()

bool isOpen ( ) const

inline

returns whether a file is open.

References GzipIfstream::gzfile_.

Referenced by GzipInputStream::getIsOpen().

open()

void open

(

const char *

filename

)

opens a file for reading (decompression)

Note

any previous open files will be closed first!

operator=()

GzipIfstream& operator= ( const GzipIfstream &  bzip2 )

protected

read()

size_t read	(	char *	s,
		size_t	n
	)

Reads n bytes from the bzip2 compressed file into buffer s.

Parameters

s	Buffer to be filled with the output
n	The size of the buffer s

Returns

The number of actually read bytes. If it is less than n, the end of the file was reached and the stream is closed

Note

This returns a raw byte stream that is not null-terminated. Be careful here.

The length of the buffer needs to at least n

Closes the stream if the end of file is reached. Check isOpen before reading from the file again

Exceptions

Exception::ConversionError	is thrown if decompression fails
Exception::IllegalArgument	is thrown if no file for decompression is given. This can happen even happen if a file was already open but read until the end.

streamEnd()

bool streamEnd ( ) const

inline

indicates whether the read function can be used safely

Returns

true if end of file was reached. Otherwise false.

References GzipIfstream::stream_at_end_.

Member Data Documentation

gzerror_

int gzerror_

protected

saves the last returned error by the read function

gzfile_

gzFile gzfile_

protected

a gzFile object(void*) . Necessary for decompression

Referenced by GzipIfstream::isOpen().

n_buffer_

int n_buffer_

protected

counts the last read duffer

stream_at_end_

bool stream_at_end_

protected

true if end of file is reached

Referenced by GzipIfstream::streamEnd().