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tesseract/image/imgtiff.cpp

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/**********************************************************************
* File: imgtiff.c (Formerly tiff.c)
* Description: Max format image reader/writer.
* Author: Ray Smith
* Created: Mon Jun 11 14:00:21 BST 1990
*
* (C) Copyright 1990, Hewlett-Packard Ltd.
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
** http://www.apache.org/licenses/LICENSE-2.0
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*
**********************************************************************/
#include "mfcpch.h" //precompiled headers
#ifdef __MSW32__
#include <io.h>
#else
#include <unistd.h>
#endif
/*
** Include automatically generated configuration file if running autoconf
*/
#ifdef HAVE_CONFIG_H
#include "config_auto.h"
#if defined(MOTOROLA_BYTE_ORDER) || defined(WORDS_BIGENDIAN)
#define __MOTO__ // Big-endian.
#endif
#endif
#ifdef USING_GETTEXT
#include <libintl.h>
#include <locale.h>
#define _(x) gettext(x)
#else
#define _(x) (x)
#endif
#include "fileerr.h"
#include "imgerrs.h"
#include "img.h"
#include "bitstrm.h"
#include "tprintf.h"
#include "serialis.h"
#include "imgtiff.h"
#define INTEL 0x4949
#define MOTO 0x4d4d
/*************************************************************************
* NOTE ON BIG-ENDIAN vs LITTLE-ENDIAN
*
* Intel machines store numbers with LSByte in the left position.
* Motorola (and PA_RISC) machines use the opposite byte ordering.
*
* This code is written so that:
* a) it will compile and run on EITHER machine type AND
* b) the program (on either machine) will process tiff file written in either
* Motorola or Intel format.
*
* The code is compiled with a __NATIVE__ define which is either MOTO or INTEL.
* MOTO and INTEL are defined (above) to be the value of the first two bytes of
* a tiff file in either format. (This identifies the filetype).
*
* Subsequent reads and writes normally just reverse the byte order if the
* machine type (__NATIVE__) is not equal to the filetype determined from the
* first two bytes of the tiff file.
*
* A special case is the "value" field of the tag structure. This can contain
* EITHER a 16bit or a 32bit value. According to the "type" field. The 4 cases
* of machine type / file type combinations need to be treated differently in
* the case of 16 bit values
*************************************************************************/
#define ENTRIES 19 /*no of entries */
#define START 8 /*start of tag table */
typedef struct
{
uinT16 tag; //entry tag
uinT16 type;
uinT32 length;
inT32 value;
} TIFFENTRY; //tiff tag entry
typedef struct myrational
{
inT32 top;
inT32 bottom;
} MYRATIONAL; //type 5
//statics for the run length codes
#define EOL_CODE 0x800
#define EOL_MASK 0xfff
#define EOL_LENGTH 12 //12 bits
#define SHORT_CODE_SIZE 64 //no of short codes
#define LONG_CODE_SIZE 40 //no of long codes
const uinT16 short_white_codes[SHORT_CODE_SIZE] = {
0xac, 0x38, 0xe, 0x1, 0xd, 0x3, 0x7, 0xf,
0x19, 0x5, 0x1c, 0x2, 0x4, 0x30, 0xb, 0x2b,
0x15, 0x35, 0x72, 0x18, 0x8, 0x74, 0x60, 0x10,
0xa, 0x6a, 0x64, 0x12, 0xc, 0x40, 0xc0, 0x58,
0xd8, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8, 0x14,
0x94, 0x54, 0xd4, 0x34, 0xb4, 0x20, 0xa0, 0x50,
0xd0, 0x4a, 0xca, 0x2a, 0xaa, 0x24, 0xa4, 0x1a,
0x9a, 0x5a, 0xda, 0x52, 0xd2, 0x4c, 0xcc, 0x2c
};
const uinT8 short_white_lengths[SHORT_CODE_SIZE] = {
8, 6, 4, 4, 4, 4, 4, 4,
5, 5, 5, 5, 6, 6, 6, 6,
6, 6, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 8, 8, 8,
8, 8, 8, 8, 8, 8, 8, 8,
8, 8, 8, 8, 8, 8, 8, 8,
8, 8, 8, 8, 8, 8, 8, 8,
8, 8, 8, 8, 8, 8, 8, 8
};
const uinT16 short_black_codes[SHORT_CODE_SIZE] = {
0x3b0, 0x2, 0x3, 0x1, 0x6, 0xc, 0x4, 0x18,
0x28, 0x8, 0x10, 0x50, 0x70, 0x20, 0xe0, 0x30,
0x3a0, 0x60, 0x40, 0x730, 0xb0, 0x1b0, 0x760, 0xa0,
0x740, 0xc0, 0x530, 0xd30,
0x330, 0xb30, 0x160, 0x960,
0x560, 0xd60, 0x4b0, 0xcb0,
0x2b0, 0xab0, 0x6b0, 0xeb0,
0x360, 0xb60, 0x5b0, 0xdb0,
0x2a0, 0xaa0, 0x6a0, 0xea0,
0x260, 0xa60, 0x4a0, 0xca0,
0x240, 0xec0, 0x1c0, 0xe40,
0x140, 0x1a0, 0x9a0, 0xd40,
0x340, 0x5a0, 0x660, 0xe60
};
const uinT8 short_black_lengths[SHORT_CODE_SIZE] = {
10, 3, 2, 2, 3, 4, 4, 5,
6, 6, 7, 7, 7, 8, 8, 9,
10, 10, 10, 11, 11, 11, 11, 11,
11, 11, 12, 12, 12, 12, 12, 12,
12, 12, 12, 12, 12, 12, 12, 12,
12, 12, 12, 12, 12, 12, 12, 12,
12, 12, 12, 12, 12, 12, 12, 12,
12, 12, 12, 12, 12, 12, 12, 12
};
const uinT16 long_white_codes[LONG_CODE_SIZE] = {
0x1b, 0x9, 0x3a, 0x76, 0x6c, 0xec, 0x26, 0xa6,
0x16, 0xe6, 0x66, 0x166, 0x96, 0x196, 0x56, 0x156,
0xd6, 0x1d6, 0x36, 0x136, 0xb6, 0x1b6, 0x32, 0x132,
0xb2, 0x6, 0x1b2,
0x80, 0x180, 0x580, 0x480, 0xc80,
0x280, 0xa80, 0x680, 0xe80, 0x380, 0xb80, 0x780, 0xf80
};
const uinT8 long_white_lengths[LONG_CODE_SIZE] = {
5, 5, 6, 7, 8, 8, 8, 8,
8, 8, 9, 9, 9, 9, 9, 9,
9, 9, 9, 9, 9, 9, 9, 9,
9, 6, 9, 11, 11, 11, 12, 12,
12, 12, 12, 12, 12, 12, 12, 12
};
const uinT16 long_black_codes[LONG_CODE_SIZE] = {
0x3c0, 0x130, 0x930, 0xda0,
0xcc0, 0x2c0, 0xac0, 0x6c0,
0x16c0, 0xa40, 0x1a40, 0x640,
0x1640, 0x9c0, 0x19c0, 0x5c0,
0x15c0, 0xdc0, 0x1dc0, 0x940,
0x1940, 0x540, 0x1540, 0xb40,
0x1b40, 0x4c0, 0x14c0,
0x80, 0x180, 0x580, 0x480, 0xc80,
0x280, 0xa80, 0x680, 0xe80, 0x380, 0xb80, 0x780, 0xf80
};
const uinT8 long_black_lengths[LONG_CODE_SIZE] = {
10, 12, 12, 12, 12, 12, 12, 13,
13, 13, 13, 13, 13, 13, 13, 13,
13, 13, 13, 13, 13, 13, 13, 13,
13, 13, 13, 11, 11, 11, 12, 12,
12, 12, 12, 12, 12, 12, 12, 12
};
/**********************************************************************
* open_tif_image
*
* Read the header of a tif format image and prepare to read the rest.
**********************************************************************/
inT8 open_tif_image( //read header
int fd, //file to read
inT32 *xsize, //size of image
inT32 *ysize,
inT8 *bpp, //bits per pixel
inT8 *photo, //interpretation
inT32 *res //resolution
) {
inT16 filetype;
inT32 start; //start of tiff directory
inT16 entries; //no of tiff entries
inT32 imagestart; //location of image in file
inT32 resoffset; //location of res
TIFFENTRY tiffentry; //tag table entry
BOOL8 compressed; //compression control
MYRATIONAL resinfo; //resolution
BOOL8 strips = false; //if in strips
*xsize = -1; //illegal values
*ysize = -1;
*bpp = -1;
*res = -1;
resoffset = -1;
if (read (fd, (char *) &filetype, sizeof filetype) != sizeof filetype
|| (filetype != INTEL && filetype != MOTO)) {
BADIMAGEFORMAT.error ("read_tif_image", TESSLOG, "Filetype");
return -1;
}
lseek (fd, 4L, 0);
if (read (fd, (char *) &start, sizeof start) != sizeof start) {
READFAILED.error ("read_tif_image", TESSLOG, "Start of tag table");
return -1;
}
if (filetype != __NATIVE__)
start = reverse32 (start);
if (start <= 0) {
BADIMAGEFORMAT.error ("read_tif_image", TESSLOG, "Start of tag table");
return -1;
}
lseek (fd, start, 0);
if (read (fd, (char *) &entries, sizeof (inT16)) != sizeof (inT16)) {
BADIMAGEFORMAT.error ("read_tif_image", TESSLOG, "Size of tag table");
return -1;
}
if (filetype != __NATIVE__)
entries = reverse16 (entries);
// printf("No of tiff directory entries=%d\n",entries);
imagestart = 0;
compressed = FALSE;
int samples_per_pixel = 1;
int bits_per_sample = 1;
for (; entries-- > 0;) {
if (read (fd, (char *) &tiffentry, sizeof tiffentry) !=
sizeof tiffentry) {
BADIMAGEFORMAT.error ("read_tif_image", TESSLOG, "Tag table entry");
return -1;
}
if (filetype != __NATIVE__) {
tiffentry.type = reverse16 (tiffentry.type);
tiffentry.tag = reverse16 (tiffentry.tag);
tiffentry.length = reverse32 (tiffentry.length);
}
if (tiffentry.type != 3) { //Full 32bit value
if (filetype != __NATIVE__)
tiffentry.value = reverse32 (tiffentry.value);
}
else {
/* A 16bit value in 4 bytes - handle with care. SEE NOTE at start of file */
if (__NATIVE__ == MOTO) {
if (filetype == MOTO) //MOTO file on MOTO Machine
tiffentry.value = tiffentry.value >> 16;
else //INTEL file on MOTO Machine
tiffentry.value = reverse32 (tiffentry.value);
}
else { //INTEL Machine
if (filetype == MOTO) //MOTO file on INTEL Machine
tiffentry.value = reverse16 ((uinT16) tiffentry.value);
//INTEL file on INTEL Machine NO ACTION NEEDED
}
//Clear top 2 MSBytes
tiffentry.value &= 0x0000ffff;
}
// printf("Tag=%x, Type=%x, Length=%x, value=%x\n",
// tiffentry.tag,tiffentry.type,tiffentry.length,tiffentry.value);
switch (tiffentry.tag) {
case 0x101:
*ysize = tiffentry.value;
break;
case 0x100:
*xsize = tiffentry.value;
break;
case 0x102:
if (tiffentry.length == 1)
bits_per_sample = (inT8) tiffentry.value;
else
bits_per_sample = 8;
break;
case 0x115:
samples_per_pixel = (inT8) tiffentry.value;
break;
case 0x111:
imagestart = tiffentry.value;
strips = tiffentry.length > 1;
break;
case 0x103:
if (tiffentry.value == 3) {
compressed = TRUE;
}
else if (tiffentry.value != 1) {
BADIMAGEFORMAT.error ("read_tif_image", TESSLOG, "Compression");
return -1;
}
break;
case 0x11a:
case 0x11b:
//resolution
resoffset = tiffentry.value;
break;
case 0x106:
*photo = (inT8) tiffentry.value;
break;
} //endswitch
}
if (*xsize <= 0 || *ysize <= 0 || imagestart <= 0) {
BADIMAGEFORMAT.error ("read_tif_image", TESSLOG, "Vital tag");
return -1;
}
tprintf(_("Image has %d * %d bit%c per pixel, and size (%d,%d)\n"),
bits_per_sample, samples_per_pixel, bits_per_sample == 1 ? ' ' : 's',
*xsize, *ysize);
*bpp = bits_per_sample * samples_per_pixel;
if (resoffset >= 0) {
lseek (fd, resoffset, 0);
if (read (fd, (char *) &resinfo, sizeof (resinfo)) != sizeof (resinfo)) {
READFAILED.error ("read_tif_image", TESSLOG, "Resolution");
return -1;
}
if (filetype != __NATIVE__) {
resinfo.top = reverse32 (resinfo.top);
resinfo.bottom = reverse32 (resinfo.bottom);
}
*res = resinfo.top / resinfo.bottom;
tprintf (_("Resolution=%d\n"), *res);
}
lseek (fd, (long) imagestart, 0);
if (strips) {
if (read (fd, (char *) &imagestart, sizeof (imagestart)) !=
sizeof (imagestart)) {
READFAILED.error ("read_tif_image", TESSLOG, "Strip offset");
return -1;
}
if (filetype != __NATIVE__)
imagestart = reverse32 (imagestart);
//indirection
lseek (fd, (long) imagestart, 0);
}
return compressed ? -2 : 0;
}
/**********************************************************************
* read_tif_image
*
* Read a whole tif image into memory.
**********************************************************************/
inT8 read_tif_image(int fd, // file to read
uinT8 *pixels, // pixels of image
inT32 xsize, // size of image
inT32 ysize,
inT8 bpp, // bits per pixel
inT32) { // bytes per line
inT32 xindex; // indices in image
inT32 yindex;
inT32 length; // short length
inT32 biglength; // extender
const uinT8 *lengths; // current lengths
const uinT16 *codes; // current codes
uinT16 codeword; // current code word
IMAGELINE imageline; // current line
IMAGE image; // dummy image
R_BITSTREAM bits; // read bitstream
uinT8 colour; // current colour
image.capture(pixels, xsize, ysize, bpp);
codeword = bits.open(fd); // open bitstream
read_eol(&bits, codeword); // find end of line
for (yindex = ysize - 1; yindex >= 0; yindex--) {
imageline.init();
colour = TRUE;
for (xindex = 0; xindex < xsize;) {
if (colour) {
lengths = long_white_lengths;
codes = long_white_codes;
}
else {
lengths = long_black_lengths;
codes = long_black_codes;
}
for (biglength = 0; biglength < LONG_CODE_SIZE
&& (codeword & bits.masks (*lengths))
!= *codes; codes++, lengths++, biglength++);
if (biglength < LONG_CODE_SIZE) {
codeword = bits.read_code (*lengths);
biglength++;
biglength *= SHORT_CODE_SIZE;
}
else
biglength = 0;
if (colour) {
lengths = short_white_lengths;
codes = short_white_codes;
}
else {
lengths = short_black_lengths;
codes = short_black_codes;
}
for (length = 0; length < SHORT_CODE_SIZE
&& (codeword & bits.masks (*lengths))
!= *codes; codes++, lengths++, length++);
if (length < SHORT_CODE_SIZE) {
codeword = bits.read_code (*lengths);
for (length += biglength; length > 0; length--, xindex++)
imageline.pixels[xindex] = colour;
colour = !colour;
}
else
break;
}
if (xindex < xsize) {
tprintf (_("%d pixels short on line %d"), xsize - xindex, yindex);
tprintf (_(", unknown code=%x\n"), codeword);
}
xindex = read_eol (&bits, codeword);
if (xindex > 0)
tprintf (_("Discarding %d bits on line %d\n"), xindex, yindex);
image.put_line (0, yindex, xsize, &imageline, 0);
}
return 0;
}
/**********************************************************************
* read_eol
*
* Take bits out of the stream until and end-of-line code is hit.
**********************************************************************/
inT32 read_eol( //read end of line
R_BITSTREAM *bits, //bitstream to read
uinT16 &code //current code
) {
BOOL8 anyones; //any 1 bits skipped
inT32 bitcount; //total bits skipped
anyones = FALSE;
bitcount = 0;
while ((code & EOL_MASK) != EOL_CODE) {
if (code & 1)
anyones = TRUE; //discarded one bit
bitcount++; //total discarded bits
code = bits->read_code (1); //take single bits
}
//extract EOL code
code = bits->read_code (EOL_LENGTH);
if (!anyones)
bitcount = 0; //ignore filler bits
return bitcount;
}
/**********************************************************************
* write_moto_tif
*
* Write a whole tif format image and close the file.
**********************************************************************/
inT8 write_moto_tif( //write whole image
int fd, //file to write on
uinT8 *pixels, //image pixels
inT32 xsize, //size of image
inT32 ysize,
inT8 bpp, //bits per pixel
inT8 photo,
inT32 res //resolution
) {
return write_tif_image (fd, pixels, xsize, ysize, bpp, res, MOTO, photo);
//use moto format
}
/**********************************************************************
* write_intel_tif
*
* Write a whole tif format image and close the file.
**********************************************************************/
inT8 write_intel_tif( //write whole image
int fd, //file to write on
uinT8 *pixels, //image pixels
inT32 xsize, //size of image
inT32 ysize,
inT8 bpp, //bits per pixel
inT8 photo,
inT32 res //resolution
) {
return write_tif_image (fd, pixels, xsize, ysize, bpp, res, INTEL, photo);
//use intel format
}
/**********************************************************************
* write_inverse_tif
*
* Write a whole tif format image and close the file.
**********************************************************************/
inT8 write_inverse_tif( //write whole image
int fd, //file to write on
uinT8 *pixels, //image pixels
inT32 xsize, //size of image
inT32 ysize,
inT8 bpp, //bits per pixel
inT8 photo,
inT32 res //resolution
) {
return write_tif_image (fd, pixels, xsize, ysize, bpp, res, INTEL,
1 - photo);
//use intel format
}
/**********************************************************************
* write_tif_image
*
* Write a whole tif format image and close the file.
**********************************************************************/
inT8 write_tif_image( //write whole image
int fd, //file to write on
uinT8 *pixels, //image pixels
inT32 xsize, //size of image
inT32 ysize,
inT8 bpp, //bits per pixel
inT32 res, //resolution
inT16 type, //format type
inT16 photo //metric interp
) {
inT32 size; //line/image size
inT16 entries; //no of tiff entries
inT32 start; //start of tag table
inT32 zero = 0;
MYRATIONAL resolution; //resolution
TIFFENTRY entry; //current entry
TIFFENTRY tags[ENTRIES] = {
{0xfe, 4, 1, 0},
{0x100, 3, 1, 0},
{0x101, 3, 1, 0},
{0x102, 3, 1, 0},
{0x103, 3, 1, 1},
{0x106, 3, 1, 1},
{ /*line art */
0x107, 3, 1, 1
},
{0x10a, 3, 1, 1},
{
0x111, 4, 1, START + ENTRIES * sizeof (TIFFENTRY)
+ sizeof (inT32) + sizeof (short) + sizeof (MYRATIONAL) * 2
}
,
{0x112, 3, 1, 1}
,
{0x115, 3, 1, 1}
,
{0x116, 4, 1, 0}
,
{0x117, 4, 1, 0}
,
{0x118, 3, 1, 0}
,
{0x119, 3, 1, 1}
,
{
0x11a, 5, 1, START + ENTRIES * sizeof (TIFFENTRY)
+ sizeof (inT32) + sizeof (short)
},
{
0x11b, 5, 1, START + ENTRIES * sizeof (TIFFENTRY)
+ sizeof (inT32) + sizeof (short) + sizeof (MYRATIONAL)
}
,
{0x11c, 3, 1, 1}
,
{0x128, 3, 1, 2}
};
resolution.top = res;
resolution.bottom = 1;
if (write (fd, (char *) &type, sizeof type) != sizeof type
|| (type != INTEL && type != MOTO)) {
WRITEFAILED.error ("write_tif_image", TESSLOG, "Filetype");
return -1;
}
start = START;
entries = 0x002a;
if (type != __NATIVE__)
entries = reverse16 (entries);
if (write (fd, (char *) &entries, sizeof entries) != sizeof entries) {
WRITEFAILED.error ("write_tif_image", TESSLOG, "Version");
return -1;
}
if (type != __NATIVE__)
start = reverse32 (start);
if (write (fd, (char *) &start, sizeof start) != sizeof start) {
WRITEFAILED.error ("write_tif_image", TESSLOG, "Start");
return -1;
}
lseek (fd, (long) START, 0);
entries = ENTRIES;
if (type != __NATIVE__)
entries = reverse16 (entries);
if (write (fd, (char *) &entries, sizeof entries) != sizeof entries) {
WRITEFAILED.error ("write_tif_image", TESSLOG, "Entries");
return -1;
}
//line length
size = COMPUTE_IMAGE_XDIM (xsize, bpp);
size *= ysize; //total image size
tags[1].value = xsize;
tags[2].value = ysize;
if (bpp == 24) {
tags[3].value = 8;
tags[10].value = 3;
tags[5].value = 2;
}
else {
tags[3].value = bpp;
tags[5].value = photo;
}
tags[11].value = ysize;
tags[14].value = (1 << bpp) - 1;
tags[12].value = size;
for (entries = 0; entries < ENTRIES; entries++) {
entry = tags[entries]; //get an entry
/* NB Convert entry.value BEFORE converting entry.type!!! */
if (entry.type != 3) { //Full 32bit value
if (type != __NATIVE__)
entry.value = reverse32 (entry.value);
}
else {
/* A 16bit value in 4 bytes - handle with care. SEE NOTE at start of file */
entry.value &= 0x0000ffff; //Ensure top 2 MSBytes clear
if (__NATIVE__ == MOTO) {
if (type == MOTO) //MOTO file on MOTO Machine
entry.value = entry.value << 16;
else //INTEL file on MOTO Machine
entry.value = reverse32 (entry.value);
}
else { //INTEL Machine
if (type == MOTO) //MOTO file on INTEL Machine
entry.value = reverse16 ((uinT16) entry.value);
//INTEL file on INTEL Machine NO ACTION NEEDED
}
}
if (type != __NATIVE__) {
entry.tag = reverse16 (entry.tag);
entry.type = reverse16 (entry.type);
entry.length = reverse32 (entry.length);
}
if (write (fd, (char *) &entry, sizeof (TIFFENTRY)) !=
sizeof (TIFFENTRY)) {
WRITEFAILED.error ("write_tif_image", TESSLOG, "Tag Table");
return -1;
}
}
if (write (fd, (char *) &zero, sizeof zero) != sizeof zero) {
WRITEFAILED.error ("write_tif_image", TESSLOG, "Tag table Terminator");
return -1;
}
if (type != __NATIVE__) {
resolution.top = reverse32 (resolution.top);
resolution.bottom = reverse32 (resolution.bottom);
}
if (write (fd, (char *) &resolution, sizeof resolution) != sizeof resolution
|| write (fd, (char *) &resolution,
sizeof resolution) != sizeof resolution) {
WRITEFAILED.error ("write_tif_image", TESSLOG, "Resolution");
return -1;
}
if (write (fd, (char *) pixels, (size_t) size) != size) {
WRITEFAILED.error ("write_tif_image", TESSLOG, "Image");
return -1;
}
close(fd);
return 0;
}
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