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/* iobuf.h - I/O buffer
* Copyright (c) 1997 by Werner Koch (dd9jn)
*
* This file is part of G10.
*
* G10 is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* G10 is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#ifndef G10_IOBUF_H
#define G10_IOBUF_H
#include "types.h"
#define DBG_IOBUF iobuf_debug_mode
#define IOBUFCTRL_INIT 1
#define IOBUFCTRL_FREE 2
#define IOBUFCTRL_UNDERFLOW 3
#define IOBUFCTRL_FLUSH 4
#define IOBUFCTRL_DESC 5
#define IOBUFCTRL_USER 16
typedef struct iobuf_struct *IOBUF;
struct iobuf_struct {
int usage; /* 1 input , 2 output, 3 temp */
unsigned long nlimit;
unsigned long nbytes; /* used together with nlimit */
unsigned long ntotal; /* total bytes read (position of stream) */
struct {
size_t size; /* allocated size */
size_t start; /* number of invalid bytes at the begin of the buffer */
size_t len; /* currently filled to this size */
byte *buf;
} d;
int filter_eof;
int (*filter)( void *opaque, int control,
IOBUF chain, byte *buf, size_t *len);
void *filter_ov; /* value for opaque */
IOBUF chain; /* next iobuf used for i/o if any (passed to filter) */
int no, subno;
const char *desc;
void *opaque; /* can be used to hold any information */
/* this value is copied to all instances */
};
int iobuf_debug_mode;
IOBUF iobuf_alloc(int usage, size_t bufsize);
IOBUF iobuf_temp(void);
IOBUF iobuf_open( const char *fname );
IOBUF iobuf_create( const char *fname );
IOBUF iobuf_append( const char *fname );
IOBUF iobuf_openrw( const char *fname );
int iobuf_close( IOBUF iobuf );
int iobuf_cancel( IOBUF iobuf );
int iobuf_push_filter( IOBUF a, int (*f)(void *opaque, int control,
IOBUF chain, byte *buf, size_t *len), void *ov );
int iobuf_pop_filter( IOBUF a, int (*f)(void *opaque, int control,
IOBUF chain, byte *buf, size_t *len), void *ov );
int iobuf_flush(IOBUF a);
void iobuf_clear_eof(IOBUF a);
void iobuf_set_limit( IOBUF a, unsigned long nlimit );
ulong iobuf_tell( IOBUF a );
int iobuf_seek( IOBUF a, ulong newpos );
int iobuf_readbyte(IOBUF a);
int iobuf_writebyte(IOBUF a, unsigned c);
int iobuf_write(IOBUF a, byte *buf, unsigned buflen );
int iobuf_writestr(IOBUF a, const char *buf );
int iobuf_write_temp( IOBUF a, IOBUF temp );
size_t iobuf_temp_to_buffer( IOBUF a, byte *buffer, size_t buflen );
u32 iobuf_get_filelength( IOBUF a );
const char *iobuf_get_fname( IOBUF a );
void iobuf_set_block_mode( IOBUF a, size_t n );
void iobuf_set_partial_block_mode( IOBUF a, size_t len );
int iobuf_in_block_mode( IOBUF a );
/* get a byte form the iobuf; must check for eof prior to this function
* this function returns values in the range 0 .. 255 or -1 to indicate EOF
* iobuf_get_noeof() does not return -1 to indicate EOF, but masks the
* returned value to be in the range 0 ..255.
*/
#define iobuf_get(a) \
( ((a)->nlimit || (a)->d.start >= (a)->d.len )? \
iobuf_readbyte((a)) : ( (a)->nbytes++, (a)->d.buf[(a)->d.start++] ) )
#define iobuf_get_noeof(a) (iobuf_get((a))&0xff)
/* write a byte to the iobuf and return true on write error
* This macro does only write the low order byte
*/
#define iobuf_put(a,c) iobuf_writebyte(a,c)
#define iobuf_where(a) "[don't know]"
#define iobuf_id(a) ((a)->no)
#define iobuf_get_temp_length(a) ( (a)->d.len )
#define iobuf_is_temp(a) ( (a)->usage == 3 )
#endif /*G10_IOBUF_H*/
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