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/* pbmtomgr.c - read a PBM image and produce a MGR bitmap
**
** Copyright (C) 1989 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.
*/
/* 2006.10 (afu)
Changed bitrow from plain to raw, read function from pbm_readpbmrow() to
pbm_readpbmrow_packed(), write function from putc() to fwrite().
Retired bitwise transformation functions.
Produces only new style bitmap (8 bit padding.) See mgrtopbm.c .
*/
#include "pbm.h"
#include "mgr.h"
static void
putinit(unsigned int const rows,
unsigned int const cols) {
struct b_header head;
size_t writtenCount;
head.magic[0] = 'y';
head.magic[1] = 'z';
head.h_wide = ((cols >> 6) & 0x3f) + ' ';
head.l_wide = (cols & 0x3f) + ' ';
head.h_high = (( rows >> 6) & 0x3f) + ' ';
head.l_high = (rows & 0x3f) + ' ';
head.depth = (1 & 0x3f) + ' ';
head._reserved = ' ';
writtenCount = fwrite(&head, sizeof(head), 1, stdout);
if (writtenCount != 1)
pm_error("fwrite() failed to write the MGR header.");
}
int
main(int argc,
char * argv[]) {
FILE * ifP;
unsigned char * bitrow;
int rows;
int cols;
int format;
unsigned int row;
unsigned int bytesPerRow;
/* Number of packed bytes (8 columns per byte) in a row. */
unsigned int padright;
/* Number of columns added to the right of each row to get up to
a multiple of 8, i.e. an integral number of packed bytes.
*/
const char * inputFileName;
pbm_init(&argc, argv);
if (argc-1 > 1)
pm_error("Too many arguments (%u). "
"Only argument is optional input file", argc-1);
if (argc-1 == 1)
inputFileName = argv[1];
else
inputFileName = "-";
ifP = pm_openr(inputFileName);
pbm_readpbminit(ifP, &cols, &rows, &format);
bitrow = pbm_allocrow_packed(cols);
bytesPerRow = pbm_packed_bytes(cols);
padright = bytesPerRow * 8 - cols;
putinit(rows, cols);
for (row = 0; row < rows; ++row) {
/* The raster formats are identical.
The row end pad bits are set to 0 in mgr.
*/
size_t bytesWritten;
pbm_readpbmrow_packed(ifP, bitrow, cols, format);
if (padright > 0) {
bitrow[bytesPerRow-1] >>= padright;
bitrow[bytesPerRow-1] <<= padright;
}
bytesWritten = fwrite(bitrow, 1, bytesPerRow, stdout);
if (bytesWritten != bytesPerRow )
pm_error("fwrite() failed to write MGR bitmap "
"to Standard Output.");
}
pm_close(ifP);
return 0;
}
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