writefile.c

Nemesis a complete Linux video security system. It s idea is a cheap replacement for your commercia

/* Nemesis
 * Copyright (C) 1999 John Ferlito <[e-mail]>
 * Copyright (C) 1998 Gerd Knorr <[e-mail]>
 *
 * 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 2 of the License, 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.
 *
 */

/*
 * save pictures to disk (ppm,pgm,jpeg)
 *
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <ctype.h>
#include <errno.h>

#include <jpeglib.h>

#include "writefile.h"


/* ---------------------------------------------------------------------- */

/*
 * count up the latest block of digits in the passed string
 * (used for filename numbering
 */
void patch_up(char *name)
{
	char *ptr;
	
	for (ptr = name+strlen(name); ptr >= name; ptr--)
		if (isdigit(*ptr))
	    		break;
	if (ptr < name)
		return;
	while (*ptr == '9' && ptr >= name)
		*(ptr--) = '0';
	if (ptr < name)
		return;
	if (isdigit(*ptr))
		(*ptr)++;
}


int write_jpeg(char *filename, char *data, int width, int height)
{
	struct jpeg_compress_struct cinfo;
	struct jpeg_error_mgr jerr;
	FILE *fp;
	int i;
	unsigned char *line;
	
	if (NULL == (fp = fopen(filename,"w"))) {
		fprintf(stderr,"grab: can't open %s: %s\n",filename,strerror(errno));
		exit(1);
		return -1;
	}
	
	cinfo.err = jpeg_std_error(&jerr);
	jpeg_create_compress(&cinfo);
	jpeg_stdio_dest(&cinfo, fp);
	cinfo.image_width = width;
	cinfo.image_height = height;
	cinfo.input_components = 3;
	cinfo.in_color_space = JCS_RGB;
	jpeg_set_defaults(&cinfo);
	jpeg_set_quality(&cinfo, 75, TRUE);
	jpeg_start_compress(&cinfo, TRUE);
	
	for (i = 0, line = data; i < height; i++, line += width*3)
		jpeg_write_scanlines(&cinfo, &line, 1);
	
	jpeg_finish_compress(&(cinfo));
	jpeg_destroy_compress(&(cinfo));
	fclose(fp);
	
	return 0;
}