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/* pgmtolispm.c - read a pgm and write a file acceptable to the
** tv:read-bit-array-file function of TI Explorer and Symbolics Lisp Machines.
**
** Written by Jamie Zawinski based on code (C) 1988 by Jef Poskanzer.
**
** 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.
**
** When one writes a multi-plane bitmap with tv:write-bit-array-file, it is
** usually a color image; but a color map is not written in the file, so we
** treat this as a graymap instead. To convert a color image to Lispm
** format, you must convert it to a pgm, and hand-edit a color map... Ick.
**
** Feb 2010 afu
** Added dimension check to prevent short int from overflowing
** Changed code style (ANSI-style function definitions, etc.)
*/
#include "pm.h"
#include "pgm.h"
#define LISPM_MAGIC "This is a BitMap file"
#define INT16MAX 32767
static unsigned int item;
static unsigned int bitsperitem, maxbitsperitem, bitshift;
static unsigned int
depth_to_word_size(unsigned int const depth) {
/* Lispm architecture specific - if a bitmap is written */
/* out with a depth of 5, it really has a depth of 8, and */
/* is stored that way in the file. */
unsigned int const wordSize =
depth == 1 ? 1 :
depth == 2 ? 2 :
depth <= 4 ? 4 :
depth <= 8 ? 8 :
depth <= 16 ? 16 :
depth <= 32 ? 32 :
0;
if (wordSize == 0)
pm_error("depth was %u, which is not in the range 1-32", depth);
return wordSize;
}
static void
putinit(unsigned int const cols,
unsigned int const rows,
unsigned int const depth) {
unsigned int const cols32 = ((cols + 31 ) / 32) * 32;
unsigned int i;
/* Lispms are able to write bit files that are not mod32 wide, but we */
/* don't. This should be ok, since bit arrays which are not mod32 wide */
/* are pretty useless on a lispm (can't hand them to bitblt). */
if (rows > INT16MAX || cols > INT16MAX || cols32 > INT16MAX)
pm_error("Input image is too large.");
printf(LISPM_MAGIC);
pm_writelittleshort(stdout, cols);
pm_writelittleshort(stdout, rows);
pm_writelittleshort(stdout, cols32);
putchar(depth & 0xFF);
for (i = 0; i < 9; ++i)
putchar(0); /* pad bytes */
item = 0;
bitsperitem = 0;
maxbitsperitem = depth_to_word_size(depth);
bitshift = 0;
}
static void
putitem(void) {
pm_writelittlelong(stdout, ~item);
item = 0;
bitsperitem = 0;
bitshift = 0;
}
static void
putval(gray const b) {
if (bitsperitem == 32)
putitem();
item = item | (b << bitshift);
bitsperitem = bitsperitem + maxbitsperitem;
bitshift = bitshift + maxbitsperitem;
}
static void
putrest(void) {
if (bitsperitem > 0)
putitem();
}
int
main(int argc, const char * argv[]) {
FILE * ifP;
gray * grayrow;
int rows;
int cols;
unsigned int depth;
int format;
unsigned int padright;
unsigned int row;
gray maxval;
const char * inputFile;
pm_proginit(&argc, argv);
if (argc-1 < 1)
inputFile = "-";
else {
inputFile = argv[1];
if (argc-1 > 2)
pm_error("Too many arguments. The only argument is the optional "
"input file name");
}
ifP = pm_openr(inputFile);
pgm_readpgminit(ifP, &cols, &rows, &maxval, &format);
grayrow = pgm_allocrow(cols);
depth = pm_maxvaltobits(maxval);
/* Compute padding to round cols up to the nearest multiple of 32. */
padright = ((cols + 31) / 32) * 32 - cols;
putinit(cols, rows, depth);
for (row = 0; row < rows; ++row) {
unsigned int col;
pgm_readpgmrow(ifP, grayrow, cols, maxval, format);
for (col = 0; col < cols; ++col)
putval(grayrow[col]);
for (col = 0; col < padright; ++col)
putval(0);
}
pm_close(ifP);
putrest();
return 0;
}
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