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znzlib.c File Reference

Low level i/o interface to compressed and noncompressed files. Written by Mark Jenkinson, FMRIB. More...

#include "znzlib.h"

Functions
znzFile	znzopen (const char *path,const char *mode,int use_compression)
znzFile	znzdopen (int fd,const char *mode,int use_compression)
int	Xznzclose (znzFile *file)
size_t	znzread (void *buf,size_t size,size_t nmemb,znzFile file)
size_t	znzwrite (const void *buf,size_t size,size_t nmemb,znzFile file)
long	znzseek (znzFile file,long offset,int whence)
int	znzrewind (znzFile stream)
long	znztell (znzFile file)
int	znzputs (const char *str,znzFile file)
char*	znzgets (char *str,int size,znzFile file)
int	znzflush (znzFile file)
int	znzeof (znzFile file)
int	znzputc (int c,znzFile file)
int	znzgetc (znzFile file)
int	znzprintf (znzFile stream,const char *format,...)

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Detailed Description

Low level i/o interface to compressed and noncompressed files. Written by Mark Jenkinson, FMRIB.

This library provides an interface to both compressed (gzip/zlib) and uncompressed (normal) file IO. The functions are written to have the same interface as the standard file IO functions.

To use this library instead of normal file IO, the following changes are required:

• replace all instances of FILE* with znzFile
• change the name of all function calls, replacing the initial character f with the znz (e.g. fseek becomes znzseek) one exception is rewind() -> znzrewind()
• add a third parameter to all calls to znzopen (previously fopen) that specifies whether to use compression (1) or not (0)
• use znz_isnull rather than any (pointer == NULL) comparisons in the code for znzfile types (normally done after a return from znzopen)

NB: seeks for writable files with compression are quite restricted

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