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/* ppmtoapplevol.c - read a portable pixmap and produce an Apple volume label
*
* Copyright 2011 Red Hat <mjg@redhat.com>
*
* 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 "pm.h"
#include "ppm.h"
static unsigned char const map[] = {
0x00, 0xf6, 0xf7, 0x2a, 0xf8, 0xf9, 0x55, 0xfa,
0xfb, 0x80, 0xfc, 0xfd, 0xab, 0xfe, 0xff, 0xd6
};
static void
writeHeader(unsigned int const cols,
FILE * const ofP) {
unsigned char header[5];
header[0] = 0x01;
header[1] = 0x00;
header[2] = cols;
header[3] = 0x00;
header[4] = 0x0c;
fwrite(header, sizeof(header), 1, ofP);
}
int
main (int argc, const char * argv[]) {
const char * inputFilename;
FILE * ifP;
int rows, cols;
pixval maxval;
int format;
pixel * pixelrow;
unsigned int row;
pm_proginit(&argc, argv);
if (argc-1 > 1)
pm_error("Too many arguments: %u. There is at most one argument: "
"the input file name", argc-1);
if (argc-1 >= 1)
inputFilename = argv[1];
else
inputFilename = "-";
ifP = pm_openr(inputFilename);
ppm_readppminit(ifP, &cols, &rows, &maxval, &format);
if (rows != 12)
pm_error("Input image must be 12 rows tall. Yours is %u", rows);
writeHeader(cols, stdout);
pixelrow = ppm_allocrow(cols);
for (row = 0; row < rows; row++) {
unsigned int col;
ppm_readppmrow(stdin, pixelrow, cols, maxval, format);
for (col = 0; col < cols; ++col) {
unsigned int const maxval15Value =
((unsigned int)PPM_GETR(pixelrow[col]) * 15 + maxval/2) /
maxval;
unsigned char const appleValue =
(unsigned char)map[15 - maxval15Value];
fwrite(&appleValue, sizeof(appleValue), 1, stdout);
}
}
ppm_freerow(pixelrow);
pm_close(ifP);
return 0;
}
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