/* "$Header: /cvsroot/VTK/VTK/Utilities/tiff/tif_atari.c,v 1.1 2002/01/29 22:38:19 andy Exp $" */

/*
 * 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) {
                TIFFError(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;
