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/* macptopbm.c - read a MacPaint file and produce a portable bitmap
**
** 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"
#include "macp.h"
static void ReadMacPaintFile ARGS(( FILE* file, int extraskip, int* scanLineP, unsigned char Pic[MAX_LINES][BYTES_WIDE] ));
static unsigned char Pic[MAX_LINES][BYTES_WIDE];
int
main( argc, argv )
int argc;
char* argv[];
{
FILE* ifp;
bit* bitrow;
int argn, extraskip, scanLine, rows, cols, row, bcol, i;
const char* usage = "[-extraskip N] [macpfile]";
pbm_init( &argc, argv );
argn = 1;
extraskip = 0;
/* Check for flags. */
if ( argn < argc && argv[argn][0] == '-' && argv[argn][1] != '\0' )
{
if ( pm_keymatch( argv[argn], "-extraskip", 2 ) )
{
argn++;
if ( argn == argc || sscanf( argv[argn], "%d", &extraskip ) != 1 )
pm_usage( usage );
}
else
pm_usage( usage );
argn++;
}
if ( argn < argc )
{
ifp = pm_openr( argv[argn] );
argn++;
}
else
ifp = stdin;
if ( argn != argc )
pm_usage( usage );
ReadMacPaintFile( ifp, extraskip, &scanLine, Pic );
pm_close( ifp );
cols = BYTES_WIDE * 8;
rows = scanLine;
pbm_writepbminit( stdout, cols, rows, 0 );
bitrow = pbm_allocrow( cols );
for ( row = 0; row < rows; row++ )
{
for ( bcol = 0; bcol < BYTES_WIDE; bcol++ )
for ( i = 0; i < 8; i++ )
bitrow[bcol * 8 + i] =
( (Pic[row][bcol] >> (7 - i)) & 1 ) ? PBM_BLACK : PBM_WHITE;
pbm_writepbmrow( stdout, bitrow, cols, 0 );
}
pm_close( stdout );
exit( 0 );
}
/*
** Some of the following routine is:
**
** Copyright 1987 by Patrick J. Naughton
** All Rights Reserved
** 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.
*/
static void
ReadMacPaintFile( file, extraskip, scanLineP, Pic )
FILE* file;
int extraskip;
int* scanLineP;
unsigned char Pic[MAX_LINES][BYTES_WIDE];
{
unsigned int i, j, k;
unsigned char ch;
/* Skip over the header. */
for ( i = 0; i < extraskip; i++ )
getc( file );
for ( i = 0; i < HEADER_LENGTH; i++ )
getc( file );
*scanLineP = 0;
k = 0;
while ( *scanLineP < MAX_LINES )
{
ch = (unsigned char) getc( file ); /* Count byte */
i = (unsigned int) ch;
if ( ch < 0x80 )
{ /* Unpack next (I+1) chars as is */
for ( j = 0; j <= i; j++ )
if ( *scanLineP < MAX_LINES )
{
Pic[*scanLineP][k++] = (unsigned char) getc( file );
if ( ! (k %= BYTES_WIDE) )
*scanLineP += 1;
}
}
else
{ /* Repeat next char (2's comp I) times */
ch = getc( file );
for ( j = 0; j <= 256 - i; j++ )
if ( *scanLineP < MAX_LINES )
{
Pic[*scanLineP][k++] = (unsigned char) ch;
if ( ! (k %= BYTES_WIDE) )
*scanLineP += 1;
}
}
}
}
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