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/* pbmtoptx.c - read a portable bitmap and produce a Printronix printer file
**
** Copyright (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.
*/
#include "pbm.h"
/* Following is obtained by reversing bit order (MFS-LFS) and adding 64. */
/* Note the two escape sequences: \\ and \x7f . */
static unsigned char const ptxchar[64] =
"@`PpHhXxDdTtLl\\|BbRrJjZzFfVvNn^~AaQqIiYyEeUuMm]}CcSsKk[{GgWwOo_\x7f";
static void
putBitrow(const bit * const bitrow,
unsigned int const cols) {
/*----------------------------------------------------------------------------
Pick up items in 6 bit units from bitrow and convert each to ptx format.
----------------------------------------------------------------------------*/
unsigned int itemCnt;
for (itemCnt = 0; itemCnt * 6 < cols; ++itemCnt) {
unsigned int const byteCnt = (itemCnt * 6) / 8;
bit const byteCur = bitrow[byteCnt];
bit const byteNext = bitrow[byteCnt + 1];
unsigned int item;
switch (itemCnt % 4) {
case 0: item = byteCur >> 2; break;
case 1: item = byteCur << 4 | byteNext >> 4; break;
case 2: item = byteCur << 2 | byteNext >> 6; break;
case 3: item = byteCur; break;
}
putchar(ptxchar[item & 0x3f]);
}
putchar(5); putchar('\n'); /* end of row mark */
}
int
main(int argc, const char ** argv) {
FILE * ifP;
bit * bitrow;
int rows, cols, format;
unsigned int row;
pm_proginit(&argc, argv);
if (argc-1 < 1)
ifP = stdin;
else {
ifP = pm_openr(argv[1]);
if (argc-1 > 1)
pm_error("Too many arguments. The only possible argument is "
"the input fil name");
}
pbm_readpbminit(ifP, &cols, &rows, &format);
bitrow = pbm_allocrow_packed(cols + 8);
bitrow[pbm_packed_bytes(cols)] = 0x00;
for (row = 0; row < rows; ++row) {
pbm_readpbmrow_packed(ifP, bitrow, cols, format);
pbm_cleanrowend_packed(bitrow, cols);
putBitrow(bitrow, cols);
}
pbm_freerow_packed(bitrow);
pm_close(ifP);
return 0;
}
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