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/* pbmtoatk.c - convert portable bitmap to Andrew Toolkit raster object
**
** Copyright (C) 1991 by Bill Janssen.
**
** Permission to use, copy, modify, and distribute this software and its
** documentation for any purpose and without fee is hereby granted, provided
** that the above copyright notice appear in all copies and that both that
** copyright notice and this permission notice appear in supporting
** documentation. This software is provided "as is" without express or
** implied warranty.
*/
#include <stdio.h>
#include <string.h>
#include "pm_c_util.h"
#include "nstring.h"
#include "pbm.h"
#define DEFAULTSCALE (1<<16)
#define RASTERVERSION 2
static void
write_atk_bytes(FILE * const file,
unsigned char const curbyte,
unsigned int const startcount) {
/* codes for data stream */
static unsigned char const whitezero = 'f';
static unsigned char const whitetwenty = 'z';
static unsigned char const blackzero = 'F';
static unsigned char const blacktwenty = 'Z';
static unsigned char const otherzero = 0x1F;
#define WHITEBYTE 0x00
#define BLACKBYTE 0xFF
/* WriteRow table for conversion of a byte value to two character
hex representation
*/
static unsigned char hex[16] = {
'0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
};
unsigned int curcount;
curcount = startcount; /* initial value */
switch (curbyte) {
case WHITEBYTE:
while (curcount > 20) {
fputc(whitetwenty, file);
curcount -= 20;
}
fputc(whitezero + curcount, file);
break;
case BLACKBYTE:
while (curcount > 20) {
fputc(blacktwenty, file);
curcount -= 20;
}
fputc(blackzero + curcount, file);
break;
default:
while (curcount > 16) {
fputc(otherzero + 16, file);
fputc(hex[curbyte / 16], file);
fputc(hex[curbyte & 15], file);
curcount -= 16;
}
if (curcount > 1)
fputc(otherzero + curcount, file);
else ; /* the byte written will represent a single instance */
fputc(hex[curbyte / 16], file);
fputc(hex[curbyte & 15], file);
}
}
static void
process_atk_byte(int * const pcurcount,
unsigned char * const pcurbyte,
FILE * const file,
unsigned char const newbyte,
int const eolflag) {
int curcount;
unsigned char curbyte;
curcount = *pcurcount; /* initial value */
curbyte = *pcurbyte; /* initial value */
if (curcount < 1) {
*pcurbyte = curbyte = newbyte;
*pcurcount = curcount = 1;
} else if (newbyte == curbyte) {
*pcurcount = (curcount += 1);
}
if (curcount > 0 && newbyte != curbyte) {
write_atk_bytes (file, curbyte, curcount);
*pcurcount = 1;
*pcurbyte = newbyte;
}
if (eolflag) {
write_atk_bytes (file, *pcurbyte, *pcurcount);
fprintf(file, " |\n");
*pcurcount = 0;
*pcurbyte = 0;
}
}
int
main(int argc, const char ** argv) {
FILE * ifP;
bit * bitrow;
int rows, cols, format;
unsigned int row;
unsigned char curbyte;
int curcount;
pm_proginit(&argc, argv);
if (argc-1 > 1)
pm_error("Too many arguments. Only argument is file name");
else if (argc-1 == 1) {
ifP = pm_openr(argv[1]);
} else {
ifP = stdin;
}
pbm_readpbminit(ifP, &cols, &rows, &format);
/* Note: atktopbm imposes limits: cols <= 1000000 rows <= 1000000
Whether these values are defined in the official file format
specification is unknown. We issue warning messages when large
values are encountered.
*/
if (cols > 1000000)
pm_message("Proceeding with extremely large width value: %u", cols);
if (rows > 1000000)
pm_message("Proceeding with extremely large height value: %u", rows);
bitrow = pbm_allocrow_packed(cols);
printf("\\begindata{raster,%d}\n", 1);
printf("%d %d %d %d ", RASTERVERSION, 0, DEFAULTSCALE, DEFAULTSCALE);
printf("%d %d %d %d\n", 0, 0, cols, rows); /* subraster */
printf("bits %d %d %d\n", 1, cols, rows);
for (row = 0; row < rows; ++row) {
unsigned int const byteCt = pbm_packed_bytes(cols);
unsigned int i;
pbm_readpbmrow_packed(ifP, bitrow, cols, format);
pbm_cleanrowend_packed(bitrow, cols);
for (i = 0, curbyte = 0, curcount = 0; i < byteCt; ++i) {
process_atk_byte(&curcount, &curbyte, stdout,
bitrow[i],
i + 1 < byteCt ? FALSE : TRUE );
}
}
pbm_freerow_packed(bitrow);
pm_close(ifP);
printf("\\enddata{raster, %d}\n", 1);
return 0;
}
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