/* "Header" */

/*
 * Copyright (c) 1988-1997 Sam Leffler
 * Copyright (c) 1991-1997 Silicon Graphics, Inc.
 *
 * Permission to use, copy, modify, distribute, and sell this software and 
 * its documentation for any purpose is hereby granted without fee, provided
 * that (i) the above copyright notices and this permission notice appear in
 * all copies of the software and related documentation, and (ii) the names of
 * Sam Leffler and Silicon Graphics may not be used in any advertising or
 * publicity relating to the software without the specific, prior written
 * permission of Sam Leffler and Silicon Graphics.
 * 
 * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, 
 * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY 
 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.  
 * 
 * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
 * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
 * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
 * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF 
 * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE 
 * OF THIS SOFTWARE.
 */

/*
 * TIFF Library ATARI-specific Routines.
 */
#include "tiffiop.h"
#if defined(__TURBOC__)
#include <tos.h>
#include <stdio.h>
#else
#include <osbind.h>
#include <fcntl.h>
#endif

#ifndef O_ACCMODE
#define O_ACCMODE 3
#endif

#include <errno.h>

#define AEFILNF   -33

static tsize_t
_tiffReadProc(thandle_t fd, tdata_t buf, tsize_t size)
{
  long r;

  r = Fread((int) fd, size, buf);
  if (r < 0) {
    errno = (int)-r;
    r = -1;
  }
  return r;
}

static tsize_t
_tiffWriteProc(thandle_t fd, tdata_t buf, tsize_t size)
{
  long r;

  r = Fwrite((int) fd, size, buf);
  if (r < 0) {
    errno = (int)-r;
    r = -1;
  }
  return r;
}

static toff_t
_tiffSeekProc(thandle_t fd, off_t off, int whence)
{
  char buf[256];
  long current_off, expected_off, new_off;

  if (whence == SEEK_END || off <= 0)
    return Fseek(off, (int) fd, whence);
  current_off = Fseek(0, (int) fd, SEEK_CUR); /* find out where we are */
  if (whence == SEEK_SET)
    expected_off = off;
  else
    expected_off = off + current_off;
  new_off = Fseek(off, (int) fd, whence);
  if (new_off == expected_off)
    return new_off;
  /* otherwise extend file -- zero filling the hole */
  if (new_off < 0)            /* error? */
    new_off = Fseek(0, (int) fd, SEEK_END); /* go to eof */
  _TIFFmemset(buf, 0, sizeof(buf));
  while (expected_off > new_off) {
    off = expected_off - new_off;
    if (off > sizeof(buf))
      off = sizeof(buf);
    if ((current_off = Fwrite((int) fd, off, buf)) != off)
      return (current_off > 0) ?
          new_off + current_off : new_off;
    new_off += off;
  }
  return new_off;
}

static int
_tiffCloseProc(thandle_t fd)
{
  long r;

  r = Fclose((int) fd);
  if (r < 0) {
    errno = (int)-r;
    r = -1;
  }
  return (int)r;
}

static toff_t
_tiffSizeProc(thandle_t fd)
{
  long pos, eof;

  pos = Fseek(0, (int) fd, SEEK_CUR);
  eof = Fseek(0, (int) fd, SEEK_END);
  Fseek(pos, (int) fd, SEEK_SET);
  return eof;
}

static int
_tiffMapProc(thandle_t fd, tdata_t* pbase, toff_t* psize)
{
  return (0);
}

static void
_tiffUnmapProc(thandle_t fd, tdata_t base, toff_t size)
{
}

/*
* Open a TIFF file descriptor for read/writing.
*/
TIFF*
TIFFFdOpen(int fd, const char* name, const char* mode)
{
  TIFF* tif;

  tif = TIFFClientOpen(name, mode,
    (thandle_t) fd,
    _tiffReadProc, _tiffWriteProc, _tiffSeekProc, _tiffCloseProc,
    _tiffSizeProc, _tiffMapProc, _tiffUnmapProc);
  if (tif)
    tif->tif_fd = fd;
  return (tif);
}

/*
* Open a TIFF file for read/writing.
*/
TIFF*
TIFFOpen(const char* name, const char* mode)
{
  static const char module[] = "TIFFOpen";
  int m;
  long fd;

  m = _TIFFgetMode(mode, module);
  if (m == -1)
    return ((TIFF*)0);
  if (m & O_TRUNC) {
    fd = Fcreate(name, 0);
  } else {
    fd = Fopen(name, m & O_ACCMODE);
    if (fd == AEFILNF && m & O_CREAT)
      fd = Fcreate(name, 0);
  }
  if (fd < 0)
    errno = (int)fd;
  if (fd < 0) {
    TIFFErrorExt(0, module, "%s: Cannot open", name);
    return ((TIFF*)0);
  }
  return (TIFFFdOpen(fd, name, mode));
}

#include <stdlib.h>

tdata_t
_TIFFmalloc(tsize_t s)
{
  return (malloc((size_t) s));
}

void
_TIFFfree(tdata_t p)
{
  free(p);
}

tdata_t
_TIFFrealloc(tdata_t p, tsize_t s)
{
  return (realloc(p, (size_t) s));
}

void
_TIFFmemset(tdata_t p, int v, size_t c)
{
  memset(p, v, (size_t) c);
}

void
_TIFFmemcpy(tdata_t d, const tdata_t s, size_t c)
{
  memcpy(d, s, (size_t) c);
}

int
_TIFFmemcmp(const tdata_t p1, const tdata_t p2, tsize_t c)
{
  return (memcmp(p1, p2, (size_t) c));
}

static void
atariWarningHandler(const char* module, const char* fmt, va_list ap)
{
  if (module != NULL)
    fprintf(stderr, "%s: ", module);
  fprintf(stderr, "Warning, ");
  vfprintf(stderr, fmt, ap);
  fprintf(stderr, ".\n");
}
TIFFErrorHandler _TIFFwarningHandler = atariWarningHandler;

static void
atariErrorHandler(const char* module, const char* fmt, va_list ap)
{
  if (module != NULL)
    fprintf(stderr, "%s: ", module);
  vfprintf(stderr, fmt, ap);
  fprintf(stderr, ".\n");
}
TIFFErrorHandler _TIFFerrorHandler = atariErrorHandler;
