Hi,
I have checked few utilities which are using libTiff decoding images
compressed by CCITT stnd are all using it's internal structures. I have
attached fax2tiff.c file with the mail, which comes with libTiff library
source.
In fax2tiff a fax file is being read and converted into a TIFF image. This
is a scenario similar to what we have to do for decoding the stream read
from a PDF file.
In copyFaxFile function, directly internal structures are accessed for
decoding.
The problem in case of decoding as mentioned in my previous mail is that
all it's internal structure won't get initialised properly since we are not
working with proper TIFF Image format.
libTiff is designed to decode a TIFF image, if we want to decode non TIFF
source then we will have to access it's internal structures.
Please advice. I am stuck here and not able to proceed.
I even tried to find some other library but all implementations are mostly
using libTiff only.
Thanks and regards,
Vivek
On Sun, Dec 7, 2008 at 6:32 AM, Vivek Paradkar <[EMAIL PROTECTED]>wrote:
> Hi,
>
> TIFFClientOpen can be used in case of encoding data.
> Panda is using TIFFClientOpen for encoding TIFF image.
>
> But for decoding TIFFClientOpen calls TIFFReadDirectory for initialising
> internal TIFFDirectory structure. The structure data is used in
> TIFFReadEncodedStrip function
> which decodes the input data into user buffer.
>
> I can call TIFFClientOpen initially with write mode so that
> TIFFReadDirectory will not be called and change the mode to read for
> decoding later. Not all fields of structure TIFFDirectory can be updated
> through TIFFSetField function like td_nstrips etc.
> which are used in TIFFReadEncodedStrip.
> I checked code for fax2tiff utility which reads fax data and converts it
> into TIFF image, but in that they are directly accessing internal structures
> and directly calling decode function, instead of calling
> TIFFReadEncodedStrip.
>
> Any suggestions.
>
> Thanks and Rgrds,
>
> Vivek Paradkar
>
> On Fri, Dec 5, 2008 at 11:55 PM, Vivek Paradkar <[EMAIL PROTECTED]>wrote:
>
>> Hi Brad,
>>
>> TIFFClientOpen is probably what you are looking for. That will allow
>> you to
>> use your own file-like routines instead of operating on an actual file.
>>
>> Yes TIFFClientOpen can be used.
>> Thanks for suggestion
>>
>> Vivek
>>
>>
>>
>> On Fri, Dec 5, 2008 at 6:25 PM, Brad Hards <[EMAIL PROTECTED]> wrote:
>>
>>> On Friday 05 December 2008 04:26:40 pm [EMAIL PROTECTED] wrote:
>>> > Current implementation of libTiff only supports encoding/decoding of
>>> TIFF
>>> > Images
>>> > read from a file.
>>> >
>>> > I will look into how panda is using libtiff library and will find out
>>> other
>>> > alternative of using libTiff
>>> > for applying filter on arbitrary array without integrating if possible.
>>>
>>> TIFFClientOpen is probably what you are looking for. That will allow you
>>> to
>>> use your own file-like routines instead of operating on an actual file.
>>>
>>> Brad
>>>
>>>
>>>
>>>
>>>
>>
>
/* $Id: fax2tiff.c,v 1.18 2006/03/21 16:37:51 dron Exp $ */
/*
* Copyright (c) 1990-1997 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.
*/
/*
* Convert a CCITT Group 3 or 4 FAX file to TIFF Group 3 or 4 format.
*/
#include "tif_config.h"
#include <stdio.h>
#include <stdlib.h> /* should have atof & getopt */
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#ifdef HAVE_FCNTL_H
# include <fcntl.h>
#endif
#ifdef HAVE_IO_H
# include <io.h>
#endif
#include "tiffiop.h"
#ifndef BINMODE
# define BINMODE
#endif
#ifndef EXIT_SUCCESS
# define EXIT_SUCCESS 0
#endif
#ifndef EXIT_FAILURE
# define EXIT_FAILURE 1
#endif
#define TIFFhowmany8(x) (((x)&0x07)?((uint32)(x)>>3)+1:(uint32)(x)>>3)
TIFF *faxTIFF;
char *rowbuf;
char *refbuf;
uint32 xsize = 1728;
int verbose;
int stretch;
uint16 badfaxrun;
uint32 badfaxlines;
int copyFaxFile(TIFF* tifin, TIFF* tifout);
static void usage(void);
int
main(int argc, char* argv[])
{
FILE *in;
TIFF *out = NULL;
TIFFErrorHandler whandler = NULL;
int compression_in = COMPRESSION_CCITTFAX3;
int compression_out = COMPRESSION_CCITTFAX3;
int fillorder_in = FILLORDER_LSB2MSB;
int fillorder_out = FILLORDER_LSB2MSB;
uint32 group3options_in = 0; /* 1d-encoded */
uint32 group3options_out = 0; /* 1d-encoded */
uint32 group4options_in = 0; /* compressed */
uint32 group4options_out = 0; /* compressed */
uint32 defrowsperstrip = (uint32) 0;
uint32 rowsperstrip;
int photometric_in = PHOTOMETRIC_MINISWHITE;
int photometric_out = PHOTOMETRIC_MINISWHITE;
int mode = FAXMODE_CLASSF;
int rows;
int c;
int pn, npages;
float resY = 196.0;
extern int optind;
extern char* optarg;
while ((c = getopt(argc, argv, "R:X:o:1234ABLMPUW5678abcflmprsuvwz?")) != -1)
switch (c) {
/* input-related options */
case '3': /* input is g3-encoded */
compression_in = COMPRESSION_CCITTFAX3;
break;
case '4': /* input is g4-encoded */
compression_in = COMPRESSION_CCITTFAX4;
break;
case 'U': /* input is uncompressed (g3 and g4) */
group3options_in |= GROUP3OPT_UNCOMPRESSED;
group4options_in |= GROUP4OPT_UNCOMPRESSED;
break;
case '1': /* input is 1d-encoded (g3 only) */
group3options_in &= ~GROUP3OPT_2DENCODING;
break;
case '2': /* input is 2d-encoded (g3 only) */
group3options_in |= GROUP3OPT_2DENCODING;
break;
case 'P': /* input has not-aligned EOL (g3 only) */
group3options_in &= ~GROUP3OPT_FILLBITS;
break;
case 'A': /* input has aligned EOL (g3 only) */
group3options_in |= GROUP3OPT_FILLBITS;
break;
case 'W': /* input has 0 mean white */
photometric_in = PHOTOMETRIC_MINISWHITE;
break;
case 'B': /* input has 0 mean black */
photometric_in = PHOTOMETRIC_MINISBLACK;
break;
case 'L': /* input has lsb-to-msb fillorder */
fillorder_in = FILLORDER_LSB2MSB;
break;
case 'M': /* input has msb-to-lsb fillorder */
fillorder_in = FILLORDER_MSB2LSB;
break;
case 'R': /* input resolution */
resY = (float) atof(optarg);
break;
case 'X': /* input width */
xsize = (uint32) atoi(optarg);
break;
/* output-related options */
case '7': /* generate g3-encoded output */
compression_out = COMPRESSION_CCITTFAX3;
break;
case '8': /* generate g4-encoded output */
compression_out = COMPRESSION_CCITTFAX4;
break;
case 'u': /* generate uncompressed output (g3 and g4) */
group3options_out |= GROUP3OPT_UNCOMPRESSED;
group4options_out |= GROUP4OPT_UNCOMPRESSED;
break;
case '5': /* generate 1d-encoded output (g3 only) */
group3options_out &= ~GROUP3OPT_2DENCODING;
break;
case '6': /* generate 2d-encoded output (g3 only) */
group3options_out |= GROUP3OPT_2DENCODING;
break;
case 'c': /* generate "classic" g3 format */
mode = FAXMODE_CLASSIC;
break;
case 'f': /* generate Class F format */
mode = FAXMODE_CLASSF;
break;
case 'm': /* output's fillorder is msb-to-lsb */
fillorder_out = FILLORDER_MSB2LSB;
break;
case 'l': /* output's fillorder is lsb-to-msb */
fillorder_out = FILLORDER_LSB2MSB;
break;
case 'o':
out = TIFFOpen(optarg, "w");
if (out == NULL) {
fprintf(stderr,
"%s: Can not create or open %s\n",
argv[0], optarg);
return EXIT_FAILURE;
}
break;
case 'a': /* generate EOL-aligned output (g3 only) */
group3options_out |= GROUP3OPT_FILLBITS;
break;
case 'p': /* generate not EOL-aligned output (g3 only) */
group3options_out &= ~GROUP3OPT_FILLBITS;
break;
case 'r': /* rows/strip */
defrowsperstrip = atol(optarg);
break;
case 's': /* stretch image by dup'ng scanlines */
stretch = 1;
break;
case 'w': /* undocumented -- for testing */
photometric_out = PHOTOMETRIC_MINISWHITE;
break;
case 'b': /* undocumented -- for testing */
photometric_out = PHOTOMETRIC_MINISBLACK;
break;
case 'z': /* undocumented -- for testing */
compression_out = COMPRESSION_LZW;
break;
case 'v': /* -v for info */
verbose++;
break;
case '?':
usage();
/*NOTREACHED*/
}
npages = argc - optind;
if (npages < 1)
usage();
rowbuf = _TIFFmalloc(TIFFhowmany8(xsize));
refbuf = _TIFFmalloc(TIFFhowmany8(xsize));
if (rowbuf == NULL || refbuf == NULL) {
fprintf(stderr, "%s: Not enough memory\n", argv[0]);
return (EXIT_FAILURE);
}
if (out == NULL) {
out = TIFFOpen("fax.tif", "w");
if (out == NULL) {
fprintf(stderr, "%s: Can not create fax.tif\n",
argv[0]);
return (EXIT_FAILURE);
}
}
faxTIFF = TIFFClientOpen("(FakeInput)", "w",
/* TIFFClientOpen() fails if we don't set existing value here */
TIFFClientdata(out),
TIFFGetReadProc(out), TIFFGetWriteProc(out),
TIFFGetSeekProc(out), TIFFGetCloseProc(out),
TIFFGetSizeProc(out), TIFFGetMapFileProc(out),
TIFFGetUnmapFileProc(out));
if (faxTIFF == NULL) {
fprintf(stderr, "%s: Can not create fake input file\n",
argv[0]);
return (EXIT_FAILURE);
}
TIFFSetMode(faxTIFF, O_RDONLY);
TIFFSetField(faxTIFF, TIFFTAG_IMAGEWIDTH, xsize);
TIFFSetField(faxTIFF, TIFFTAG_SAMPLESPERPIXEL, 1);
TIFFSetField(faxTIFF, TIFFTAG_BITSPERSAMPLE, 1);
TIFFSetField(faxTIFF, TIFFTAG_FILLORDER, fillorder_in);
TIFFSetField(faxTIFF, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);
TIFFSetField(faxTIFF, TIFFTAG_PHOTOMETRIC, photometric_in);
TIFFSetField(faxTIFF, TIFFTAG_YRESOLUTION, resY);
TIFFSetField(faxTIFF, TIFFTAG_RESOLUTIONUNIT, RESUNIT_INCH);
/* NB: this must be done after directory info is setup */
TIFFSetField(faxTIFF, TIFFTAG_COMPRESSION, compression_in);
if (compression_in == COMPRESSION_CCITTFAX3)
TIFFSetField(faxTIFF, TIFFTAG_GROUP3OPTIONS, group3options_in);
else if (compression_in == COMPRESSION_CCITTFAX4)
TIFFSetField(faxTIFF, TIFFTAG_GROUP4OPTIONS, group4options_in);
for (pn = 0; optind < argc; pn++, optind++) {
in = fopen(argv[optind], "r" BINMODE);
if (in == NULL) {
fprintf(stderr,
"%s: %s: Can not open\n", argv[0], argv[optind]);
continue;
}
#if defined(_WIN32) && defined(USE_WIN32_FILEIO)
TIFFSetClientdata(faxTIFF, (thandle_t)_get_osfhandle(fileno(in)));
#else
TIFFSetClientdata(faxTIFF, (thandle_t)fileno(in));
#endif
TIFFSetFileName(faxTIFF, (const char*)argv[optind]);
TIFFSetField(out, TIFFTAG_IMAGEWIDTH, xsize);
TIFFSetField(out, TIFFTAG_BITSPERSAMPLE, 1);
TIFFSetField(out, TIFFTAG_COMPRESSION, compression_out);
TIFFSetField(out, TIFFTAG_PHOTOMETRIC, photometric_out);
TIFFSetField(out, TIFFTAG_ORIENTATION, ORIENTATION_TOPLEFT);
TIFFSetField(out, TIFFTAG_SAMPLESPERPIXEL, 1);
switch (compression_out) {
/* g3 */
case COMPRESSION_CCITTFAX3:
TIFFSetField(out, TIFFTAG_GROUP3OPTIONS,
group3options_out);
TIFFSetField(out, TIFFTAG_FAXMODE, mode);
rowsperstrip =
(defrowsperstrip)?defrowsperstrip:(uint32)-1L;
break;
/* g4 */
case COMPRESSION_CCITTFAX4:
TIFFSetField(out, TIFFTAG_GROUP4OPTIONS,
group4options_out);
TIFFSetField(out, TIFFTAG_FAXMODE, mode);
rowsperstrip =
(defrowsperstrip)?defrowsperstrip:(uint32)-1L;
break;
default:
rowsperstrip = (defrowsperstrip) ?
defrowsperstrip : TIFFDefaultStripSize(out, 0);
}
TIFFSetField(out, TIFFTAG_ROWSPERSTRIP, rowsperstrip);
TIFFSetField(out, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);
TIFFSetField(out, TIFFTAG_FILLORDER, fillorder_out);
TIFFSetField(out, TIFFTAG_SOFTWARE, "fax2tiff");
TIFFSetField(out, TIFFTAG_XRESOLUTION, 204.0);
if (!stretch) {
TIFFGetField(faxTIFF, TIFFTAG_YRESOLUTION, &resY);
TIFFSetField(out, TIFFTAG_YRESOLUTION, resY);
} else
TIFFSetField(out, TIFFTAG_YRESOLUTION, 196.);
TIFFSetField(out, TIFFTAG_RESOLUTIONUNIT, RESUNIT_INCH);
TIFFSetField(out, TIFFTAG_PAGENUMBER, pn, npages);
if (!verbose)
whandler = TIFFSetWarningHandler(NULL);
rows = copyFaxFile(faxTIFF, out);
fclose(in);
if (!verbose)
(void) TIFFSetWarningHandler(whandler);
TIFFSetField(out, TIFFTAG_IMAGELENGTH, rows);
if (verbose) {
fprintf(stderr, "%s:\n", argv[optind]);
fprintf(stderr, "%d rows in input\n", rows);
fprintf(stderr, "%ld total bad rows\n",
(long) badfaxlines);
fprintf(stderr, "%d max consecutive bad rows\n", badfaxrun);
}
if (compression_out == COMPRESSION_CCITTFAX3 &&
mode == FAXMODE_CLASSF) {
TIFFSetField(out, TIFFTAG_BADFAXLINES, badfaxlines);
TIFFSetField(out, TIFFTAG_CLEANFAXDATA, badfaxlines ?
CLEANFAXDATA_REGENERATED : CLEANFAXDATA_CLEAN);
TIFFSetField(out, TIFFTAG_CONSECUTIVEBADFAXLINES, badfaxrun);
}
TIFFWriteDirectory(out);
}
TIFFClose(out);
_TIFFfree(rowbuf);
_TIFFfree(refbuf);
return (EXIT_SUCCESS);
}
int
copyFaxFile(TIFF* tifin, TIFF* tifout)
{
uint32 row;
uint32 linesize = TIFFhowmany8(xsize);
uint16 badrun;
int ok;
tifin->tif_rawdatasize = TIFFGetFileSize(tifin);
tifin->tif_rawdata = _TIFFmalloc(tifin->tif_rawdatasize);
if (tifin->tif_rawdata == NULL) {
TIFFError(tifin->tif_name, "Not enough memory");
return (0);
}
if (!ReadOK(tifin, tifin->tif_rawdata, tifin->tif_rawdatasize)) {
TIFFError(tifin->tif_name, "Read error at scanline 0");
return (0);
}
tifin->tif_rawcp = tifin->tif_rawdata;
tifin->tif_rawcc = tifin->tif_rawdatasize;
(*tifin->tif_setupdecode)(tifin);
(*tifin->tif_predecode)(tifin, (tsample_t) 0);
tifin->tif_row = 0;
badfaxlines = 0;
badfaxrun = 0;
_TIFFmemset(refbuf, 0, linesize);
row = 0;
badrun = 0; /* current run of bad lines */
while (tifin->tif_rawcc > 0) {
ok = (*tifin->tif_decoderow)(tifin, (tdata_t) rowbuf,
linesize, 0);
if (!ok) {
badfaxlines++;
badrun++;
/* regenerate line from previous good line */
_TIFFmemcpy(rowbuf, refbuf, linesize);
} else {
if (badrun > badfaxrun)
badfaxrun = badrun;
badrun = 0;
_TIFFmemcpy(refbuf, rowbuf, linesize);
}
tifin->tif_row++;
if (TIFFWriteScanline(tifout, rowbuf, row, 0) < 0) {
fprintf(stderr, "%s: Write error at row %ld.\n",
tifout->tif_name, (long) row);
break;
}
row++;
if (stretch) {
if (TIFFWriteScanline(tifout, rowbuf, row, 0) < 0) {
fprintf(stderr, "%s: Write error at row %ld.\n",
tifout->tif_name, (long) row);
break;
}
row++;
}
}
if (badrun > badfaxrun)
badfaxrun = badrun;
_TIFFfree(tifin->tif_rawdata);
return (row);
}
char* stuff[] = {
"usage: fax2tiff [options] input.raw...",
"where options are:",
" -3 input data is G3-encoded [default]",
" -4 input data is G4-encoded",
" -U input data is uncompressed (G3 or G4)",
" -1 input data is 1D-encoded (G3 only) [default]",
" -2 input data is 2D-encoded (G3 only)",
" -P input is not EOL-aligned (G3 only) [default]",
" -A input is EOL-aligned (G3 only)",
" -M input data has MSB2LSB bit order",
" -L input data has LSB2MSB bit order [default]",
" -B input data has min 0 means black",
" -W input data has min 0 means white [default]",
" -R # input data has # resolution (lines/inch) [default is 196]",
" -X # input data has # width [default is 1728]",
"",
" -o out.tif write output to out.tif",
" -7 generate G3-encoded output [default]",
" -8 generate G4-encoded output",
" -u generate uncompressed output (G3 or G4)",
" -5 generate 1D-encoded output (G3 only)",
" -6 generate 2D-encoded output (G3 only) [default]",
" -p generate not EOL-aligned output (G3 only)",
" -a generate EOL-aligned output (G3 only) [default]",
" -c generate \"classic\" TIFF format",
" -f generate TIFF Class F (TIFF/F) format [default]",
" -m output fill order is MSB2LSB",
" -l output fill order is LSB2MSB [default]",
" -r # make each strip have no more than # rows",
" -s stretch image by duplicating scanlines",
" -v print information about conversion work",
" -z generate LZW compressed output",
NULL
};
static void
usage(void)
{
char buf[BUFSIZ];
int i;
setbuf(stderr, buf);
fprintf(stderr, "%s\n\n", TIFFGetVersion());
for (i = 0; stuff[i] != NULL; i++)
fprintf(stderr, "%s\n", stuff[i]);
exit(EXIT_FAILURE);
}
/* vim: set ts=8 sts=8 sw=8 noet: */
