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g3topbm.c
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C/C++ Source or Header
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1980-12-04
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8KB
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434 lines
/* g3topbm.c - read a Group 3 FAX file and write a portable 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.
*/
#include <stdio.h>
#include "pbm.h"
int eof;
main( argc, argv )
int argc;
char *argv[];
{
FILE *ifd;
/* register bit **bits, *bP; */
register bit *bitrow, *bP;
bit getbit();
int argn, rows, cols, row, col;
pm_progname = argv[0];
argn = 1;
if ( argn < argc )
{
ifd = pm_openr( argv[argn] );
argn++;
}
else
ifd = stdin;
if ( argn != argc )
pm_usage( "[g3file]" );
getinit( ifd, &cols, &rows );
/* bits = pbm_allocarray( cols, rows ); */
pbm_writepbminit( stdout, cols, rows );
bitrow = pbm_allocrow( cols );
for ( row = 0; row < rows; row++ )
{
getlineinit( );
/* for ( col = 0, bP = bits[row]; col < cols; col++, bP++ ) */
for ( col = 0, bP = bitrow; col < cols; col++, bP++ )
*bP = getbit( ifd );
pbm_writepbmrow( stdout, bitrow, cols );
}
pm_close( ifd );
/* pbm_writepbm( stdout, bits, cols, rows ); */
exit( 0 );
}
bit data;
int eol, eols, count, item, bitsinitem;
int rawitem, rawbitsinitem, rawbitshift, rawzeros;
getinit( file, colsP, rowsP )
FILE *file;
int *colsP, *rowsP;
{
*colsP = 1728;
*rowsP = 2236;
eof = 0;
eols = 0;
}
getlineinit( )
{
rawbitsinitem = 8;
rawzeros = 0;
eol = 0;
data = 1;
count = 0;
}
bit
getbit( file )
FILE *file;
{
int i;
bit b, rawgetbit( );
struct tableentry {
int code;
int length;
int count;
};
static struct tableentry twtable[] = {
{ 0x35, 8, 0 },
{ 0x7, 6, 1 },
{ 0x7, 4, 2 },
{ 0x8, 4, 3 },
{ 0xb, 4, 4 },
{ 0xc, 4, 5 },
{ 0xe, 4, 6 },
{ 0xf, 4, 7 },
{ 0x13, 5, 8 },
{ 0x14, 5, 9 },
{ 0x7, 5, 10 },
{ 0x8, 5, 11 },
{ 0x8, 6, 12 },
{ 0x3, 6, 13 },
{ 0x34, 6, 14 },
{ 0x35, 6, 15 },
{ 0x2a, 6, 16 },
{ 0x2b, 6, 17 },
{ 0x27, 7, 18 },
{ 0xc, 7, 19 },
{ 0x8, 7, 20 },
{ 0x17, 7, 21 },
{ 0x3, 7, 22 },
{ 0x4, 7, 23 },
{ 0x28, 7, 24 },
{ 0x2b, 7, 25 },
{ 0x13, 7, 26 },
{ 0x24, 7, 27 },
{ 0x18, 7, 28 },
{ 0x2, 8, 29 },
{ 0x3, 8, 30 },
{ 0x1a, 8, 31 },
{ 0x1b, 8, 32 },
{ 0x12, 8, 33 },
{ 0x13, 8, 34 },
{ 0x14, 8, 35 },
{ 0x15, 8, 36 },
{ 0x16, 8, 37 },
{ 0x17, 8, 38 },
{ 0x28, 8, 39 },
{ 0x29, 8, 40 },
{ 0x2a, 8, 41 },
{ 0x2b, 8, 42 },
{ 0x2c, 8, 43 },
{ 0x2d, 8, 44 },
{ 0x4, 8, 45 },
{ 0x5, 8, 46 },
{ 0xa, 8, 47 },
{ 0xb, 8, 48 },
{ 0x52, 8, 49 },
{ 0x53, 8, 50 },
{ 0x54, 8, 51 },
{ 0x55, 8, 52 },
{ 0x24, 8, 53 },
{ 0x25, 8, 54 },
{ 0x58, 8, 55 },
{ 0x59, 8, 56 },
{ 0x5a, 8, 57 },
{ 0x5b, 8, 58 },
{ 0x4a, 8, 59 },
{ 0x4b, 8, 60 },
{ 0x32, 8, 61 },
{ 0x33, 8, 62 },
{ 0x34, 8, 63 },
};
static struct tableentry mwtable[] = {
{ 0x1b, 5, 64 },
{ 0x12, 5, 128 },
{ 0x17, 6, 192 },
{ 0x37, 7, 256 },
{ 0x36, 8, 320 },
{ 0x37, 8, 384 },
{ 0x64, 8, 448 },
{ 0x65, 8, 512 },
{ 0x68, 8, 576 },
{ 0x67, 8, 640 },
{ 0xcc, 9, 704 },
{ 0xcd, 9, 768 },
{ 0xd2, 9, 832 },
{ 0xd3, 9, 896 },
{ 0xd4, 9, 960 },
{ 0xd5, 9, 1024 },
{ 0xd6, 9, 1088 },
{ 0xd7, 9, 1152 },
{ 0xd8, 9, 1216 },
{ 0xd9, 9, 1280 },
{ 0xda, 9, 1344 },
{ 0xdb, 9, 1408 },
{ 0x98, 9, 1472 },
{ 0x99, 9, 1536 },
{ 0x9a, 9, 1600 },
{ 0x18, 6, 1664 },
{ 0x9b, 9, 1728 },
};
static struct tableentry tbtable[] = {
{ 0x37, 10, 0 },
{ 0x2, 3, 1 },
{ 0x3, 2, 2 },
{ 0x2, 2, 3 },
{ 0x3, 3, 4 },
{ 0x3, 4, 5 },
{ 0x2, 4, 6 },
{ 0x3, 5, 7 },
{ 0x5, 6, 8 },
{ 0x4, 6, 9 },
{ 0x4, 7, 10 },
{ 0x5, 7, 11 },
{ 0x7, 7, 12 },
{ 0x4, 8, 13 },
{ 0x7, 8, 14 },
{ 0x18, 9, 15 },
{ 0x17, 10, 16 },
{ 0x18, 10, 17 },
{ 0x8, 10, 18 },
{ 0x67, 11, 19 },
{ 0x68, 11, 20 },
{ 0x6c, 11, 21 },
{ 0x37, 11, 22 },
{ 0x28, 11, 23 },
{ 0x17, 11, 24 },
{ 0x18, 11, 25 },
{ 0xca, 12, 26 },
{ 0xcb, 12, 27 },
{ 0xcc, 12, 28 },
{ 0xcd, 12, 29 },
{ 0x68, 12, 30 },
{ 0x69, 12, 31 },
{ 0x6a, 12, 32 },
{ 0x6b, 12, 33 },
{ 0xd2, 12, 34 },
{ 0xd3, 12, 35 },
{ 0xd4, 12, 36 },
{ 0xd5, 12, 37 },
{ 0xd6, 12, 38 },
{ 0xd7, 12, 39 },
{ 0x6c, 12, 40 },
{ 0x6d, 12, 41 },
{ 0xda, 12, 42 },
{ 0xdb, 12, 43 },
{ 0x54, 12, 44 },
{ 0x55, 12, 45 },
{ 0x56, 12, 46 },
{ 0x57, 12, 47 },
{ 0x64, 12, 48 },
{ 0x65, 12, 49 },
{ 0x52, 12, 50 },
{ 0x53, 12, 51 },
{ 0x24, 12, 52 },
{ 0x37, 12, 53 },
{ 0x38, 12, 54 },
{ 0x27, 12, 55 },
{ 0x28, 12, 56 },
{ 0x58, 12, 57 },
{ 0x59, 12, 58 },
{ 0x2b, 12, 59 },
{ 0x2c, 12, 60 },
{ 0x5a, 12, 61 },
{ 0x66, 12, 62 },
{ 0x67, 12, 63 },
};
static struct tableentry mbtable[] = {
{ 0xf, 10, 64 },
{ 0xc8, 12, 128 },
{ 0xc9, 12, 192 },
{ 0x5b, 12, 256 },
{ 0x33, 12, 320 },
{ 0x34, 12, 384 },
{ 0x35, 12, 448 },
{ 0x6c, 13, 512 },
{ 0x6d, 13, 576 },
{ 0x4a, 13, 640 },
{ 0x4b, 13, 704 },
{ 0x4c, 13, 768 },
{ 0x4d, 13, 832 },
{ 0x72, 13, 896 },
{ 0x73, 13, 960 },
{ 0x74, 13, 1024 },
{ 0x75, 13, 1088 },
{ 0x76, 13, 1152 },
{ 0x77, 13, 1216 },
{ 0x52, 13, 1280 },
{ 0x53, 13, 1344 },
{ 0x54, 13, 1408 },
{ 0x55, 13, 1472 },
{ 0x5a, 13, 1536 },
{ 0x5b, 13, 1600 },
{ 0x64, 13, 1664 },
{ 0x65, 13, 1728 },
};
static struct tableentry embtable[] = {
{ 0x8, 11, 1792 },
{ 0xc, 11, 1856 },
{ 0xd, 11, 1920 },
{ 0x12, 12, 1984 },
{ 0x13, 12, 2048 },
{ 0x14, 12, 2112 },
{ 0x15, 12, 2176 },
{ 0x16, 12, 2240 },
{ 0x17, 12, 2304 },
{ 0x1c, 12, 2368 },
{ 0x1d, 12, 2432 },
{ 0x1e, 12, 2496 },
{ 0x1f, 12, 2560 },
};
while ( count == 0 && ! eol && ! eof )
{
data = 1 - data;
makeup:
item = 0;
for ( bitsinitem = 1; bitsinitem <= ( data ? 13 : 9 ); bitsinitem++ )
{
/* Get bit and check for EOL. */
if ( rawzeros >= 11 && ( b = rawgetbit( file ) ) )
{
eol = 1;
eols++;
if ( eols >= 6 )
eof = 1;
goto continuewhile;
}
else
b = rawgetbit( file );
item = item * 2 + rawgetbit( file );
/* Check tables. */
if ( data )
{ /* Black. */
for ( i = 0;
i < sizeof( tbtable ) / sizeof( struct tableentry );
i++ )
if ( bitsinitem == tbtable[i].length &&
item == tbtable[i].code )
{
count += tbtable[i].count;
eols = 0;
goto continuewhile;
}
for ( i = 0;
i < sizeof( mbtable ) / sizeof( struct tableentry );
i++ )
if ( bitsinitem == mbtable[i].length &&
item == mbtable[i].code )
{
count += mbtable[i].count;
eols = 0;
goto makeup;
}
for ( i = 0;
i < sizeof( embtable ) / sizeof( struct tableentry );
i++ )
if ( bitsinitem == embtable[i].length &&
item == embtable[i].code )
{
count += embtable[i].count;
eols = 0;
goto makeup;
}
}
else
{ /* White. */
for ( i = 0;
i < sizeof( twtable ) / sizeof( struct tableentry );
i++ )
if ( bitsinitem == twtable[i].length &&
item == twtable[i].code )
{
count += twtable[i].count;
eols = 0;
goto continuewhile;
}
for ( i = 0;
i < sizeof( mwtable ) / sizeof( struct tableentry );
i++ )
if ( bitsinitem == mwtable[i].length &&
item == mwtable[i].code )
{
count += mwtable[i].count;
eols = 0;
goto makeup;
}
}
}
/* Unrecognized code. Skip to EOL. */
fprintf( stderr, "g3topbm: unrecognized code - skipping to EOL\n" );
while ( rawzeros < 11 )
b = rawgetbit( file );
do
{
b = rawgetbit( file );
}
while ( ! b );
eol = 1;
eols++;
if ( eols >= 6 )
eof = 1;
continuewhile:
;
}
/* And return result. */
if ( eol || eof )
return 0;
else
{
count--;
return data;
}
}
bit
rawgetbit( file )
FILE *file;
{
bit b;
if ( rawbitsinitem == 8 )
{
rawitem = getc( file );
if ( rawitem == EOF )
pm_error( "premature EOF", 0,0,0,0,0 );
rawbitsinitem = 0;
rawbitshift = 7;
}
rawbitsinitem++;
b = ( ( rawitem >> rawbitshift) & 1 ) ? PBM_BLACK : PBM_WHITE;
rawbitshift--;
if ( b )
rawzeros = 0;
else
rawzeros++;
return b;
}