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TIFF and LibTiff Mail List Archive

Thread

1998.04.22 18:36 "Problems appending to TIFF files on Windows NT platform", by Chris Griffin
1998.04.23 12:54 "RE: Problems appending to TIFF files on Windows NT platform", by Tim Shaporev
1998.04.24 09:30 "RE: Problems appending to TIFF files on Windows NT platform", by Tim Shaporev

1998.04.24 09:30 "RE: Problems appending to TIFF files on Windows NT platform", by Tim Shaporev

>From: Chris Griffin <cgriffin@mathworks.com>
>
>If it will work for appending images, I'd like to give your code a try.

Frankly speaking I never tried to append images. Moreover, I even do not try TIFFOpen() directly sonce I needed TIFFFdOpen() instead, but there is good chance that it will work for you. If it fails you have choice either modify TIFFOpen() or use the following sequnce instead

        fd = _open(xxx, _O_BINARY|_O_RDWR);
        tif = TIFFFdOpen(fd, xxx, "a");

>From: Gerben Vos <gerben@ZyLAB.NL>
>
>>If anybody is interested in such a beast - let me know address to send.
>I'm interested. Maybe if enough people are interested,
>you could post it to the list.

Ok. Right now.

>From: "Gilles Vollant" <info@winimage.com>
>
>What is your problem in using tif_win32.c?

Generally speaking it is problem in Win32 - it has two (at least) function sets to deal with file descriptors: OpenFile()/ReadFile() etc. and _open()/_read() etc. You could imagine: file discriptor returned by _open() is not readable by ReadFile()! Since I have to use _open() I just add several defines to tif_unix.c and compile it under Windows. As far as I know there is no difference in functionality between _open() function set and UNIX functions (in binary mode) so it might help in other cases.

Below is tif_unix.c with my changes. Good luck!

                                Tim

/* $Header: /d1/sam/tiff/libtiff/RCS/tif_unix.c,v 1.17 1997/08/29 21:46:02 sam 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 UNIX-specific Routines.
 */
#include "tiffiop.h"
#include <sys/types.h>
#ifdef _WIN32
#       include <io.h>
#else
#       include <unistd.h>
#endif
#include <stdlib.h>
#ifdef _WIN32
#       define read     _read
#       define write    _write
#       define lseek    _lseek
#       define close    _close
#endif

static tsize_t
_tiffReadProc(thandle_t fd, tdata_t buf, tsize_t size)
{
        return ((tsize_t) read((int) fd, buf, (size_t) size));
}

static tsize_t
_tiffWriteProc(thandle_t fd, tdata_t buf, tsize_t size)
{
        return ((tsize_t) write((int) fd, buf, (size_t) size));
}

static toff_t
_tiffSeekProc(thandle_t fd, toff_t off, int whence)
{
        return ((toff_t) lseek((int) fd, (off_t) off, whence));
}

static int
_tiffCloseProc(thandle_t fd)
{
        return (close((int) fd));
}

#include <sys/stat.h>

static toff_t
_tiffSizeProc(thandle_t fd)
{
#ifdef _WIN32
        return _filelength((int)fd);
#else
#   ifdef _AM29K
        long fsize;
        return ((fsize = lseek((int) fd, 0, SEEK_END)) < 0 ? 0 : fsize);
#   else
        struct stat sb;
        return (toff_t) (fstat((int) fd, &sb) < 0 ? 0 : sb.st_size);
#   endif
#endif
}

#ifdef HAVE_MMAP
#include <sys/mman.h>

static int
_tiffMapProc(thandle_t fd, tdata_t* pbase, toff_t* psize)
{
        toff_t size = _tiffSizeProc(fd);
        if (size != (toff_t) -1) {
                *pbase = (tdata_t)
                    mmap(0, size, PROT_READ, MAP_SHARED, (int) fd, 0);
                if (*pbase != (tdata_t) -1) {
                        *psize = size;
                        return (1);
                }
        }
        return (0);
}

static void
_tiffUnmapProc(thandle_t fd, tdata_t base, toff_t size)
{
        (void) fd;
        (void) munmap(base, (off_t) size);
}
#else /* !HAVE_MMAP */
static int
_tiffMapProc(thandle_t fd, tdata_t* pbase, toff_t* psize)
{
        (void) fd; (void) pbase; (void) psize;
        return (0);
}

static void
_tiffUnmapProc(thandle_t fd, tdata_t base, toff_t size)
{
        (void) fd; (void) base; (void) size;
}
#endif /* !HAVE_MMAP */

/*
 * 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, fd;

        if ((m = _TIFFgetMode(mode, module)) == -1) return ((TIFF*)0);
#ifdef _WIN32
        fd = _open(name, m|_O_BINARY, _S_IREAD|_S_IWRITE);
#else
#   ifdef _AM29K
        fd = open(name, m);
#   else
        fd = open(name, m, 0666);
#   endif
#endif
        if (fd < 0) {
                TIFFError(module, "%s: Cannot open", name);
                return ((TIFF *)0);
        }
        return (TIFFFdOpen(fd, name, mode));
}

void*
_TIFFmalloc(tsize_t s)
{
        return (malloc((size_t) s));
}

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

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

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

void
_TIFFmemcpy(tdata_t d, const tdata_t s, tsize_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
unixWarningHandler(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 = unixWarningHandler;

static void
unixErrorHandler(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 = unixErrorHandler;