/* ----------------------------- MNI Header -----------------------------------
@NAME       : file_io.h
@DESCRIPTION: Header file for doing io from acr_nema code.
@METHOD     : 
@GLOBALS    : 
@CREATED    : November 9, 1993 (Peter Neelin)
@MODIFIED   : 
 * $Log: file_io.h,v $
 * Revision 6.3  2005/03/04 00:08:08  bert
 * Cleanup headers, mostly by getting rid of the infernal 'public' and using extern instead
 *
 * Revision 6.2  2000/05/17 20:17:48  neelin
 * Added mechanism to allow testing of input streams for more data through
 * function acr_file_ismore.
 * This is used in dicom_client_routines to allow asynchronous transfer
 * of data, with testing for more input done before sending new messages.
 * Previous use of select for this was misguided, since select may report that
 * no data is waiting on the file descriptor while data is store in the file
 * pointer buffer (or Acr file pointer buffer).
 *
 * Revision 6.1  1999/10/29 17:51:53  neelin
 * Fixed Log keyword
 *
 * Revision 6.0  1997/09/12 13:23:59  neelin
 * Release of minc version 0.6
 *
 * Revision 5.0  1997/08/21  13:25:00  neelin
 * Release of minc version 0.5
 *
 * Revision 4.0  1997/05/07  20:01:23  neelin
 * Release of minc version 0.4
 *
 * Revision 3.1  1997/04/21  20:21:09  neelin
 * Updated the library to handle dicom messages.
 *
 * Revision 3.0  1995/05/15  19:32:12  neelin
 * Release of minc version 0.3
 *
 * Revision 2.0  1994/09/28  10:36:14  neelin
 * Release of minc version 0.2
 *
 * Revision 1.4  94/09/28  10:35:43  neelin
 * Pre-release
 * 
 * Revision 1.3  94/04/08  10:32:10  neelin
 * Fixed io tracing.
 * 
 * Revision 1.2  93/11/25  10:37:43  neelin
 * Added file free and ungetc and trace.
 * 
 * Revision 1.1  93/11/10  10:33:33  neelin
 * Initial revision
 * 
@COPYRIGHT  :
              Copyright 1993 Peter Neelin, McConnell Brain Imaging Centre, 
              Montreal Neurological Institute, McGill University.
              Permission to use, copy, modify, and distribute this
              software and its documentation for any purpose and without
              fee is hereby granted, provided that the above copyright
              notice appear in all copies.  The author and McGill University
              make no representations about the suitability of this
              software for any purpose.  It is provided "as is" without
              express or implied warranty.
---------------------------------------------------------------------------- */

/* Define constants */

#define ACR_NO_WATCHPOINT LONG_MAX

/* Define io routine prototype */

typedef int (*Acr_Io_Routine)
     (void *io_data, void *buffer, int nbytes);

/* Define prototype for io routine that tests for more input */

typedef int (*Acr_Ismore_Function)
     (void *io_data);

/* Structure used for reading and writing in acr_nema routines */

typedef struct {
   void *io_data;
   Acr_Io_Routine io_routine;
   Acr_Ismore_Function ismore_function;
   int maxlength;               /* Maximum length of read request */
   unsigned char *start;
   unsigned char *end;
   unsigned char *ptr;
   int length;                  /* Length of actual data in buffer */
   int buffer_length;           /* Length of allocated buffer */
   int stream_type;
   int reached_eof;             /* TRUE if we have reached end of file */
   int do_trace;                /* TRUE if file should be traced */
   FILE *tracefp;
   int watchpoint_set;          /* TRUE if a watchpoint is set */
   long bytes_to_watchpoint;    /* number of bytes from start of buffer
                                   to watchpoint */
   void *client_data;           /* Data that can be set by calling routines */
} Acr_File;

/* Macros for getting and putting a character */

#define acr_getc(afp)   ( ((afp)->ptr < (afp)->end) ? \
                         *((afp)->ptr++) : \
                         acr_file_read_more(afp) )

#define acr_putc(c,afp) ( ((afp)->ptr < (afp)->end) ? \
                         (int) (*((afp)->ptr++) = (unsigned char) (c)) : \
                         acr_file_write_more(afp, c) )

/* Function definitions */
extern void acr_file_enable_trace(Acr_File *afp);
extern void acr_file_disable_trace(Acr_File *afp);
extern Acr_File *acr_file_initialize(void *io_data,
                                     int maxlength,
                                     Acr_Io_Routine io_routine);
extern void acr_file_free(Acr_File *afp);
extern void acr_file_reset(Acr_File *afp);
extern void acr_file_set_ismore_function(Acr_File *afp, 
                                         Acr_Ismore_Function ismore_function);
extern void acr_file_set_eof(Acr_File *afp);
extern void acr_file_set_client_data(Acr_File *afp, void *client_data);
extern void *acr_file_get_client_data(Acr_File *afp);
extern int acr_file_read_more(Acr_File *afp);
extern int acr_file_write_more(Acr_File *afp, int character);
extern int acr_file_flush(Acr_File *afp);
extern int acr_ungetc(int c, Acr_File *afp);
extern void *acr_file_get_io_data(Acr_File *afp);
extern void acr_set_io_watchpoint(Acr_File *afp, long bytes_to_watchpoint);
extern long acr_get_io_watchpoint(Acr_File *afp);
extern int acr_file_ismore(Acr_File *afp);
extern int acr_stdio_read(void *io_data, void *buffer, int nbytes);
extern int acr_stdio_write(void *io_data, void *buffer, int nbytes);
extern int acr_stdio_ismore(void *io_data);