zu_file.h File Reference

Unified Compressed File Access System. More...

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

Go to the source code of this file.

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 zu_file.h.

Macro Definition Documentation

ZU_BUFREADSIZE

#define ZU_BUFREADSIZE   256000

Definition at line 50 of file zu_file.h.

ZU_COMPRESS_AUTO

#define ZU_COMPRESS_AUTO   (-1)

Definition at line 45 of file zu_file.h.

ZU_COMPRESS_BZIP

#define ZU_COMPRESS_BZIP   2

Definition at line 48 of file zu_file.h.

ZU_COMPRESS_GZIP

#define ZU_COMPRESS_GZIP   1

Definition at line 47 of file zu_file.h.

ZU_COMPRESS_NONE

#define ZU_COMPRESS_NONE   0

Definition at line 46 of file zu_file.h.

Function Documentation

zu_bzSeekForward()

int zu_bzSeekForward	(	ZUFILE *	f,
		unsigned long	nbytes
	)

Definition at line 221 of file zu_file.cpp.

zu_can_read_file()

int zu_can_read_file

(

const char *

fname

)

Definition at line 28 of file zu_file.cpp.

zu_close()

int zu_close

(

ZUFILE *

f

)

Definition at line 131 of file zu_file.cpp.

zu_filesize()

long zu_filesize

(

ZUFILE *

f

)

Definition at line 162 of file zu_file.cpp.

zu_open()

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

Definition at line 40 of file zu_file.cpp.

zu_read()

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

Definition at line 112 of file zu_file.cpp.

zu_rewind()

void zu_rewind

(

ZUFILE *

f

)

Definition at line 244 of file zu_file.cpp.

zu_seek()

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

Definition at line 174 of file zu_file.cpp.

zu_tell()

long zu_tell

(

ZUFILE *

f

)

Definition at line 159 of file zu_file.cpp.