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/* leaftoppm.c - read an ileaf img file and write a PPM
*
* Copyright (C) 1994 by Bill O'Donnell.
*
* 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.
*
* known problems: doesn't do compressed ileaf images.
*
*/
#include <stdio.h>
#include "ppm.h"
#define MAXCOLORS 256
#define LEAF_MAXVAL 255
static void
leaf_init(FILE * const fp,
int * const colsP,
int * const rowsP,
int * const depthP,
int * const ncolorsP,
pixel * const colors) {
unsigned char buf[256];
unsigned char compressed;
short version;
short cols;
short rows;
short depth;
long magic;
pm_readbiglong(fp, &magic);
if (magic != 0x894f5053)
pm_error("Bad magic number. First 4 bytes should be "
"0x894f5053 but are instead 0x%08x", (unsigned)magic);
/* version = 2 bytes
hres = 2
vres = 2
unique id = 4
offset x = 2
offset y = 2
TOTAL = 14 bytes
*/
pm_readbigshort(fp, &version);
if (fread(buf, 1, 12, fp) != 12)
pm_error("bad header, short file?");
pm_readbigshort(fp, &cols);
*colsP = cols;
pm_readbigshort(fp, &rows);
*rowsP = rows;
pm_readbigshort(fp, &depth);
*depthP = depth;
if ((compressed = fgetc(fp)) != 0)
pm_error("Can't do compressed images.");
if ((*depthP == 1) && (version < 4)) {
fgetc(fp);
*ncolorsP = 0;
} else if ((*depthP == 8) && (version < 4)) {
fgetc(fp);
*ncolorsP = 0;
} else {
long format;
pm_readbiglong(fp, &format);
if (format == 0x29000000) {
/* color image */
short ncolors;
pm_readbigshort(fp, &ncolors);
if (ncolors > 0) {
/* 8-bit image */
unsigned int i;
if (ncolors > 256)
pm_error("Can't have > 256 colors in colormap.");
/* read colormap */
for (i=0; i < 256; ++i)
PPM_PUTR(colors[i], fgetc(fp));
for (i=0; i < 256; ++i)
PPM_PUTG(colors[i], fgetc(fp));
for (i=0; i < 256; ++i)
PPM_PUTB(colors[i], fgetc(fp));
*ncolorsP = ncolors;
} else {
/* 24-bit image */
*ncolorsP = 0;
}
} else if (*depthP ==1) {
/* mono image */
short dummy;
pm_readbigshort(fp, &dummy); /* must toss cmap size */
*ncolorsP = 0;
} else {
/* gray image */
short dummy;
pm_readbigshort(fp, &dummy); /* must toss cmap size */
*ncolorsP = 0;
}
}
}
int
main(int argc, char * argv[]) {
pixval const maxval = LEAF_MAXVAL;
FILE *ifd;
pixel colormap[MAXCOLORS];
int rows, cols, row, col, depth, ncolors;
ppm_init(&argc, argv);
if (argc-1 > 1)
pm_error("Too many arguments. Only argument is ileaf file name");
if (argc-1 == 1)
ifd = pm_openr(argv[1]);
else
ifd = stdin;
leaf_init(ifd, &cols, &rows, &depth, &ncolors, colormap);
if ((depth == 8) && (ncolors == 0)) {
/* gray image */
gray * grayrow;
unsigned int row;
pgm_writepgminit( stdout, cols, rows, maxval, 0 );
grayrow = pgm_allocrow(cols);
for (row = 0; row < rows; ++row) {
unsigned int col;
for ( col = 0; col < cols; ++col)
grayrow[col] = (gray)fgetc(ifd);
if (cols % 2)
fgetc (ifd); /* padding */
pgm_writepgmrow(stdout, grayrow, cols, maxval, 0);
}
pgm_freerow(grayrow);
} else if (depth == 24) {
pixel * pixrow;
unsigned int row;
ppm_writeppminit(stdout, cols, rows, maxval, 0);
pixrow = ppm_allocrow(cols);
/* true color */
for (row = 0; row < rows; ++row) {
for (col = 0; col < cols; ++col)
PPM_PUTR(pixrow[col], fgetc(ifd));
if (cols % 2)
fgetc (ifd); /* padding */
for (col = 0; col < cols; ++col)
PPM_PUTG(pixrow[col], fgetc(ifd));
if (cols % 2)
fgetc (ifd); /* padding */
for (col = 0; col < cols; ++col)
PPM_PUTB(pixrow[col], fgetc(ifd));
if (cols % 2)
fgetc (ifd); /* padding */
ppm_writeppmrow(stdout, pixrow, cols, maxval, 0);
}
ppm_freerow(pixrow);
} else if (depth == 8) {
/* 8-bit (color mapped) image */
pixel * pixrow;
ppm_writeppminit(stdout, cols, rows, (pixval) maxval, 0);
pixrow = ppm_allocrow( cols );
for (row = 0; row < rows; ++row) {
for (col = 0; col < cols; ++col)
pixrow[col] = colormap[fgetc(ifd)];
if (cols %2)
fgetc(ifd); /* padding */
ppm_writeppmrow(stdout, pixrow, cols, maxval, 0);
}
ppm_freerow(pixrow);
} else if (depth == 1) {
/* mono image */
bit *bitrow;
unsigned int row;
pbm_writepbminit(stdout, cols, rows, 0);
bitrow = pbm_allocrow(cols);
for (row = 0; row < rows; ++row) {
unsigned char bits;
bits = 0x00; /* initial value */
for (col = 0; col < cols; ++col) {
int const shift = col % 8;
if (shift == 0)
bits = (unsigned char) fgetc(ifd);
bitrow[col] = (bits & (unsigned char)(0x01 << (7 - shift))) ?
PBM_WHITE : PBM_BLACK;
}
if ((cols % 16) && (cols % 16) <= 8)
fgetc(ifd); /* 16 bit pad */
pbm_writepbmrow(stdout, bitrow, cols, 0);
}
pbm_freerow(bitrow);
}
pm_close(ifd);
return 0;
}
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