sane-project-backends/include/sane/sanei_wire.h

109 wiersze
3.5 KiB
C

/* sane - Scanner Access Now Easy.
Copyright (C) 1997 David Mosberger-Tang
This file is part of the SANE package.
SANE 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.
SANE 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 sane; see the file COPYING. If not, write to the Free
Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
Support routines to translate internal datatypes into a wire-format
(used for RPCs and to save/restore options). */
#ifndef sanei_wire_h
#define sanei_wire_h
#include <sys/types.h>
typedef enum
{
WIRE_ENCODE = 0,
WIRE_DECODE,
WIRE_FREE
}
WireDirection;
struct Wire;
typedef void (*WireCodecFunc) (struct Wire *w, void *val_ptr);
typedef ssize_t (*WireReadFunc) (int fd, void * buf, size_t len);
typedef ssize_t (*WireWriteFunc) (int fd, const void * buf, size_t len);
typedef struct Wire
{
int version; /* protocol version in use */
WireDirection direction;
int status;
struct
{
WireCodecFunc w_byte;
WireCodecFunc w_char;
WireCodecFunc w_word;
WireCodecFunc w_string;
}
codec;
struct
{
size_t size;
char *curr;
char *start;
char *end;
}
buffer;
struct
{
int fd;
WireReadFunc read;
WireWriteFunc write;
}
io;
}
Wire;
extern void sanei_w_init (Wire *w, void (*codec_init)(Wire *));
extern void sanei_w_exit (Wire *w);
extern void sanei_w_space (Wire *w, size_t howmuch);
extern void sanei_w_void (Wire *w);
extern void sanei_w_byte (Wire *w, SANE_Byte *v);
extern void sanei_w_char (Wire *w, SANE_Char *v);
extern void sanei_w_word (Wire *w, SANE_Word *v);
extern void sanei_w_bool (Wire *w, SANE_Bool *v);
extern void sanei_w_ptr (Wire *w, void **v, WireCodecFunc w_value,
size_t value_size);
extern void sanei_w_string (Wire *w, SANE_String *v);
extern void sanei_w_status (Wire *w, SANE_Status *v);
extern void sanei_w_constraint_type (Wire *w, SANE_Constraint_Type *v);
extern void sanei_w_value_type (Wire *w, SANE_Value_Type *v);
extern void sanei_w_unit (Wire *w, SANE_Unit *v);
extern void sanei_w_action (Wire *w, SANE_Action *v);
extern void sanei_w_frame (Wire *w, SANE_Frame *v);
extern void sanei_w_range (Wire *w, SANE_Range *v);
extern void sanei_w_range_ptr (Wire *w, SANE_Range **v);
extern void sanei_w_device (Wire *w, SANE_Device *v);
extern void sanei_w_device_ptr (Wire *w, SANE_Device **v);
extern void sanei_w_option_descriptor (Wire *w, SANE_Option_Descriptor *v);
extern void sanei_w_option_descriptor_ptr (Wire *w,
SANE_Option_Descriptor **v);
extern void sanei_w_parameters (Wire *w, SANE_Parameters *v);
extern void sanei_w_array (Wire *w, SANE_Word *len, void **v,
WireCodecFunc w_element, size_t element_size);
extern void sanei_w_set_dir (Wire *w, WireDirection dir);
extern void sanei_w_call (Wire *w, SANE_Word proc_num,
WireCodecFunc w_arg, void *arg,
WireCodecFunc w_reply, void *reply);
extern void sanei_w_reply (Wire *w, WireCodecFunc w_reply, void *reply);
extern void sanei_w_free (Wire *w, WireCodecFunc w_reply, void *reply);
#endif /* sanei_wire_h */