mirror of
git://git.gnupg.org/gnupg.git
synced 2024-11-10 21:38:50 +01:00
122 lines
3.9 KiB
C
122 lines
3.9 KiB
C
/* 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*/
|