#include <DataFile.h>

Public Member Functions
	DataHeader (DataFile *datafile)
	Create header for given data file. More...

	~DataHeader ()
	Destructor releases the current DataFile.

void	clear ()
	Fill the data with zeroes, invalidate the data.

bool	isValid ()
	Is offset valid?

size_t	available ()
	Returns number of unused samples in buffer.

size_t	capacity ()
	Returns max. number of values in buffer.

void	read (FileOffset offset)
	Read (and convert) from offset in current DataFile, updating offset. More...

void	write () const
	Convert and write to current offset in current DataFile. More...

bool	read_next ()
	Read the next data header.

bool	read_prev ()
	Read the previous data header.

void	set_prev (const stdString &basename, FileOffset offset)
	Helper to set data.prev_file/offset.

void	set_next (const stdString &basename, FileOffset offset)
	Helper to set data.next_file/offset.

void	show (FILE *f, bool full_detail)
	Print data.

Public Attributes
struct DataHeader::DataHeaderData	data
	header data

DataFile *	datafile
	The currently used DataFile (DataHeader handles ref and release).

FileOffset	offset
	Offset in current file for this header. More...

Detailed Description

Used by DataFile.

Each data block in the binary data files starts with a DataHeader.

Constructor & Destructor Documentation

DataHeader::DataHeader ( DataFile * datafile )

Create header for given data file.

DataHeader references and releases the DataFile. Note that operations like readNext might switch to another DataFile!

void DataHeader::read ( FileOffset offset )

Read (and convert) from offset in current DataFile, updating offset.

Exceptions

GenericException on error.

void DataHeader::write ( ) const

Convert and write to current offset in current DataFile.

Exceptions

GenericException on error.

FileOffset DataHeader::offset

Offset in current file for this header.

Note that this is the pointer to the DataHeaderData on the disk. Data files with tags have 'INFO' + channel name before that!

The documentation for this class was generated from the following file:

/home/malitsky/projects/epics-archiver/sourceforge/trunk/ea4-cpp/include/classic/storage/DataFile.h