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/* input-pbm.c: read PBM files.
Copyright (C) 1990, 1991, 2011 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "config.h"
#include "file-input.h"
#include "main.h"
#include "image-header.h"
#include "input-pbm.h"
#include "pbmplus.h"
#include "pbm.h"
/* Where the input comes from. */
static FILE *pbm_input_file;
static string pbm_input_filename;
/* Only one file can be open at a time. We do no path searching. If
FILENAME can't be opened, we quit. */
void
pbm_open_input_file (string filename)
{
assert (pbm_input_file == NULL);
pbm_input_file = xfopen (filename, "r");
pbm_input_filename = filename;
}
/* Close the input file. If it hasn't been opened, we quit. */
void
pbm_close_input_file ()
{
assert (pbm_input_file != NULL);
xfclose (pbm_input_file, pbm_input_filename);
pbm_input_file = NULL;
}
/* Read the header information.
Modifies the global image_header in main.c. */
void
pbm_get_header ()
{
int width, height, format;
pbm_readpbminit (pbm_input_file, &width, &height, &format);
image_header.width = (two_bytes) width;
image_header.height = (two_bytes) height;
image_header.depth = 0;
image_header.format = (two_bytes) format;
}
/* Read one scanline of the image. */
boolean
pbm_get_scanline (one_byte *line_in_bits)
{
int c = getc (pbm_input_file);
if (c == EOF)
return false;
ungetc (c, pbm_input_file);
pbm_readpbmrow (pbm_input_file, line_in_bits, image_header.width,
image_header.format);
print_scanline (line_in_bits, image_header.width);
return true;
}
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