kopia lustrzana https://gitlab.com/sane-project/frontends
105 wiersze
3.3 KiB
C
105 wiersze
3.3 KiB
C
/* sane - Scanner Access Now Easy.
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Copyright (C) 1997 David Mosberger-Tang
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This file is part of the SANE package.
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SANE is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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SANE is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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License for more details.
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You should have received a copy of the GNU General Public License
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along with sane; see the file COPYING. If not, write to the Free
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Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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Support routines to translate internal datatypes into a wire-format
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(used for RPCs and to save/restore options). */
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#ifndef sanei_wire_h
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#define sanei_wire_h
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#include <sys/types.h>
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typedef enum
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{
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WIRE_ENCODE = 0,
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WIRE_DECODE,
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WIRE_FREE
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}
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WireDirection;
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struct Wire;
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typedef void (*WireCodecFunc) (struct Wire *w, void *val_ptr);
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typedef ssize_t (*WireReadFunc) (int fd, void * buf, size_t len);
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typedef ssize_t (*WireWriteFunc) (int fd, const void * buf, size_t len);
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typedef struct Wire
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{
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int version; /* protocol version in use */
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WireDirection direction;
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int status;
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struct
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{
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WireCodecFunc w_byte;
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WireCodecFunc w_char;
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WireCodecFunc w_word;
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WireCodecFunc w_string;
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}
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codec;
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struct
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{
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size_t size;
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char *curr;
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char *start;
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char *end;
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}
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buffer;
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struct
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{
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int fd;
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WireReadFunc read;
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WireWriteFunc write;
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}
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io;
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}
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Wire;
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extern void sanei_w_init (Wire *w, void (*codec_init)(Wire *));
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extern void sanei_w_space (Wire *w, size_t howmuch);
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extern void sanei_w_void (Wire *w);
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extern void sanei_w_byte (Wire *w, SANE_Byte *v);
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extern void sanei_w_char (Wire *w, SANE_Char *v);
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extern void sanei_w_word (Wire *w, SANE_Word *v);
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extern void sanei_w_string (Wire *w, SANE_String *v);
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extern void sanei_w_status (Wire *w, SANE_Status *v);
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extern void sanei_w_constraint_type (Wire *w, SANE_Constraint_Type *v);
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extern void sanei_w_value_type (Wire *w, SANE_Value_Type *v);
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extern void sanei_w_unit (Wire *w, SANE_Unit *v);
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extern void sanei_w_action (Wire *w, SANE_Action *v);
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extern void sanei_w_frame (Wire *w, SANE_Frame *v);
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extern void sanei_w_range (Wire *w, SANE_Range *v);
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extern void sanei_w_range_ptr (Wire *w, SANE_Range **v);
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extern void sanei_w_device (Wire *w, SANE_Device *v);
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extern void sanei_w_device_ptr (Wire *w, SANE_Device **v);
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extern void sanei_w_option_descriptor (Wire *w, SANE_Option_Descriptor *v);
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extern void sanei_w_option_descriptor_ptr (Wire *w,
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SANE_Option_Descriptor **v);
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extern void sanei_w_parameters (Wire *w, SANE_Parameters *v);
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extern void sanei_w_array (Wire *w, SANE_Word *len, void **v,
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WireCodecFunc w_element, size_t element_size);
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extern void sanei_w_set_dir (Wire *w, WireDirection dir);
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extern void sanei_w_call (Wire *w, SANE_Word proc_num,
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WireCodecFunc w_arg, void *arg,
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WireCodecFunc w_reply, void *reply);
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extern void sanei_w_reply (Wire *w, WireCodecFunc w_reply, void *reply);
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extern void sanei_w_free (Wire *w, WireCodecFunc w_reply, void *reply);
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#endif /* sanei_wire_h */
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