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- /* hipstopgm.c - read a HIPS file and produce a portable graymap
- **
- ** 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 "pgm.h"
-
- struct HIPS_Header {
- char* orig_name; /* An indication of the originator of this sequence. */
- char* seq_name; /* The sequence name. */
- int num_frame; /* The number of frames in this sequence. */
- char* orig_date; /* The date the sequence was originated. */
- int rows; /* The number of rows in each image, the height. */
- int cols; /* The number of columns in each image, the width. */
- int bits_per_pixel; /* The number of significant bits per pixel. */
- int bit_packing; /* Nonzero if the bits were packed such as to
- eliminate any unused bits resulting from a
- bits_per_pixel value which was not an even
- multiple of eight. */
- int pixel_format; /* An indication of the format of each pixel. */
- char* seq_history; /* A description of the sequence of transformations
- leading up to the current image. */
- char* seq_desc; /* A free form description of the contents of the
- sequence. */
- };
- #define HIPS_PFBYTE 0
- #define HIPS_PFSHORT 1
- #define HIPS_PFINT 2
- #define HIPS_PFFLOAT 3
- #define HIPS_PFCOMPLEX 4
-
- static void read_hips_header ARGS(( FILE* fd, struct HIPS_Header* hP ));
- static void read_line ARGS(( FILE* fd, char* buf, int size ));
-
- int
- main( argc, argv )
- int argc;
- char* argv[];
- {
- FILE* ifp;
- gray* grayrow;
- register gray* gP;
- int argn, row;
- register int col;
- int maxval;
- int rows, cols;
- struct HIPS_Header h;
-
-
- pgm_init( &argc, argv );
-
- argn = 1;
-
- if ( argn < argc )
- {
- ifp = pm_openr( argv[argn] );
- argn++;
- }
- else
- ifp = stdin;
-
- if ( argn != argc )
- pm_usage( "[hipsfile]" );
-
- read_hips_header( ifp, &h );
-
- cols = h.cols;
- rows = h.rows * h.num_frame;
-
- switch ( h.pixel_format )
- {
- case HIPS_PFBYTE:
- if ( h.bits_per_pixel != 8 )
- pm_error(
- "can't handle unusual bits_per_pixel %d", h.bits_per_pixel );
- if ( h.bit_packing != 0 )
- pm_error( "can't handle bit_packing" );
- maxval = 255;
- break;
-
- default:
- pm_error( "unknown pixel format %d", h.pixel_format );
- }
- if ( maxval > PGM_MAXMAXVAL )
- pm_error(
- "bits_per_pixel is too large - try reconfiguring with PGM_BIGGRAYS" );
-
- pgm_writepgminit( stdout, cols, rows, (gray) maxval, 0 );
- grayrow = pgm_allocrow( cols );
- for ( row = 0; row < rows; row++)
- {
- for ( col = 0, gP = grayrow; col < cols; col++, gP++ )
- {
- int ich;
-
- switch ( h.pixel_format )
- {
- case HIPS_PFBYTE:
- ich = getc( ifp );
- if ( ich == EOF )
- pm_error( "EOF / read error" );
- *gP = (gray) ich;
- break;
-
- default:
- pm_error( "can't happen" );
- }
- }
- pgm_writepgmrow( stdout, grayrow, cols, (gray) maxval, 0 );
- }
- pm_close( ifp );
- pm_close( stdout );
-
- exit( 0 );
- }
-
- static void
- read_hips_header( fd, hP )
- FILE* fd;
- struct HIPS_Header* hP;
- {
- char buf[5000];
-
- /* Read and toss orig_name. */
- read_line( fd, buf, 5000 );
-
- /* Read and toss seq_name. */
- read_line( fd, buf, 5000 );
-
- /* Read num_frame. */
- read_line( fd, buf, 5000 );
- hP->num_frame = atoi( buf );
-
- /* Read and toss orig_date. */
- read_line( fd, buf, 5000 );
-
- /* Read rows. */
- read_line( fd, buf, 5000 );
- hP->rows = atoi( buf );
-
- /* Read cols. */
- read_line( fd, buf, 5000 );
- hP->cols = atoi( buf );
-
- /* Read bits_per_pixel. */
- read_line( fd, buf, 5000 );
- hP->bits_per_pixel = atoi( buf );
-
- /* Read bit_packing. */
- read_line( fd, buf, 5000 );
- hP->bit_packing = atoi( buf );
-
- /* Read pixel_format. */
- read_line( fd, buf, 5000 );
- hP->pixel_format = atoi( buf );
-
- /* Now read and toss lines until we get one with just a period. */
- do
- {
- read_line( fd, buf, 5000 );
- }
- while ( strcmp( buf, ".\n" ) != 0 );
- }
-
- static void
- read_line( fd, buf, size )
- FILE* fd;
- char* buf;
- int size;
- {
- if ( fgets( buf, size, fd ) == NULL )
- pm_error( "error reading header" );
- }
-