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/*
* stream.h -- Stream definitions
*
* Copyright (c) 1997 by Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de>
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive
* for more details.
*/
#ifndef _stream_h
#define _stream_h
typedef struct _module {
/* data supplied by the module */
char *name; /* name of this module */
long maxbuf; /* max. bytes a fillbuf() call
* can return */
/* methods */
int (*open)( const char *name ); /* open the module */
long (*fillbuf)( char *buf ); /* fill a buffer, max. maxbuf bytes
* returned */
int (*skip)( long cnt ); /* skip data (for seek), optional,
* returns amount skipped */
int (*close)( void ); /* close the module */
/* data maintained by general streams layer */
char *buf; /* current buffer */
char *bufp; /* pointer into buffer */
long buf_cnt; /* #chars left in buffer */
long fpos; /* position in stream */
int eof; /* EOF indicator */
long last_shown; /* last call of show_progress */
/* links to neighbour modules */
struct _module *down, *up;
} MODULE;
/* initializer for fields in MODULE not supplied by module */
#define MOD_REST_INIT \
NULL, NULL, 0, 0, 0, 0, /* buffer data */ \
NULL, NULL /* down, up pointers */
/***************************** Prototypes *****************************/
void stream_init( void );
void stream_push( MODULE *mod );
int sopen( const char *name );
long sread( char *buf, long cnt );
int sseek( long offset, int whence );
int sclose( void );
/************************* End of Prototypes **************************/
/***************************** Modules ********************************/
/* file_mod.c */
extern MODULE file_mod;
/* gunzip_mod.c */
extern MODULE gunzip_mod;
/* bunzip2_mod.c */
extern MODULE bunzip2_mod;
/*********************** End of Modules *******************************/
#endif /* _stream_h */
/* Local Variables: */
/* tab-width: 4 */
/* End: */
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