Unified Compressed File Access System. More...

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include <zlib.h>
#include <bzlib.h>

Classes
struct	ZUFILE

Macros
#define	ZU_COMPRESS_AUTO -1

#define	ZU_COMPRESS_NONE 0

#define	ZU_COMPRESS_GZIP 1

#define	ZU_COMPRESS_BZIP 2

#define	ZU_BUFREADSIZE 256000

Functions
ZUFILE *	zu_open (const char fname, const char mode, int type=ZU_COMPRESS_AUTO)

int	zu_close (ZUFILE *f)

int	zu_can_read_file (const char *fname)

int	zu_read (ZUFILE f, void buf, long len)

long	zu_tell (ZUFILE *f)

int	zu_seek (ZUFILE *f, long offset, int whence)

void	zu_rewind (ZUFILE *f)

long	zu_filesize (ZUFILE *f)

int	zu_bzSeekForward (ZUFILE *f, unsigned long nbytes)

Detailed Description

Unified Compressed File Access System.

Provides a consistent interface for reading both compressed and uncompressed GRIB files with support for:

Uncompressed files
GZIP compression (.gz)
BZIP2 compression (.bz2)

Features:

Transparent compression detection
Unified file operations (open, read, seek, tell)
Large file support
Buffered reading for performance
Error handling and validation

This system allows the GRIB plugin to work seamlessly with compressed weather data files while handling the complexities of different compression formats internally.

Definition in file zuFile.h.

Macro Definition Documentation

◆ ZU_BUFREADSIZE

#define ZU_BUFREADSIZE 256000

Definition at line 61 of file zuFile.h.

◆ ZU_COMPRESS_AUTO

#define ZU_COMPRESS_AUTO -1

Definition at line 56 of file zuFile.h.

◆ ZU_COMPRESS_BZIP

#define ZU_COMPRESS_BZIP 2

Definition at line 59 of file zuFile.h.

◆ ZU_COMPRESS_GZIP

#define ZU_COMPRESS_GZIP 1

Definition at line 58 of file zuFile.h.

◆ ZU_COMPRESS_NONE

#define ZU_COMPRESS_NONE 0

Definition at line 57 of file zuFile.h.

Function Documentation

◆ zu_bzSeekForward()

int zu_bzSeekForward	(	ZUFILE *	f,
		unsigned long	nbytes
	)

Definition at line 218 of file zuFile.cpp.

◆ zu_can_read_file()

int zu_can_read_file ( const char * fname )

Definition at line 25 of file zuFile.cpp.

◆ zu_close()

int zu_close ( ZUFILE * f )

Definition at line 128 of file zuFile.cpp.

◆ zu_filesize()

long zu_filesize ( ZUFILE * f )

Definition at line 159 of file zuFile.cpp.

◆ zu_open()

ZUFILE * zu_open	(	const char *	fname,
		const char *	mode,
		int	type = `ZU_COMPRESS_AUTO`
	)

Definition at line 37 of file zuFile.cpp.

◆ zu_read()

int zu_read	(	ZUFILE *	f,
		void *	buf,
		long	len
	)

Definition at line 109 of file zuFile.cpp.

◆ zu_rewind()

void zu_rewind ( ZUFILE * f )

Definition at line 241 of file zuFile.cpp.

◆ zu_seek()

int zu_seek	(	ZUFILE *	f,
		long	offset,
		int	whence
	)

Definition at line 171 of file zuFile.cpp.

◆ zu_tell()

long zu_tell ( ZUFILE * f )

Definition at line 156 of file zuFile.cpp.

Classes

Macros

Functions