src/download.c

/*
 * viking -- GPS Data and Topo Analyzer, Explorer, and Manager
 *
 * Copyright (C) 2003-2005, Evan Battaglia <gtoevan@gmx.net>
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <glib.h>
#include <glib/gstdio.h>
#include <glib/gi18n.h>

#include "download.h"

#include "curl_download.h"

static int check_map_file(FILE* f)
{
  char **s;
  char *bp;
  int res = 0;  /* good */
  fpos_t pos;
  char buf[33];
  size_t nr;
  char * html_str[] = {
    "<html",
    "<!DOCTYPE html",
    "<head",
    "<title",
    NULL
  };


  memset(buf, 0, sizeof(buf));
  fgetpos(f, &pos);
  rewind(f);
  nr = fread(buf, 1, sizeof(buf) - 1, f);
  fsetpos(f, &pos);
  for (bp = buf; (bp < (buf + sizeof(buf) - 1)) && (nr > (bp - buf)); bp++) {
    if (!(isspace(*bp)))
      break;
  }
  if ((bp >= (buf + sizeof(buf) -1)) || ((bp - buf) >= nr))
    return(res);
  for (s = html_str; *s; s++) {
    if (strncasecmp(*s, bp, strlen(*s)) == 0)
      return(-1);
  }
  return(res);
}

static int download( const char *hostname, const char *uri, const char *fn, DownloadOptions *options, gboolean ftp)
{
  FILE *f;
  int ret;
  char *tmpfilename;

  /* Check file */
  if ( g_file_test ( fn, G_FILE_TEST_EXISTS ) == TRUE )
  {
    /* File exists: return */
    return -3;
  } else {
    gchar *dir = g_path_get_dirname ( fn );
    g_mkdir_with_parents ( dir , 0777 );
    g_free ( dir );

    /* create placeholder file */
    if ( ! (f = g_fopen ( fn, "w+b" )) ) /* immediately open file so other threads won't -- prevents race condition */
      return -4;
    fclose ( f );
    f = NULL;
  }

  tmpfilename = g_strdup_printf("%s.tmp", fn);
  f = g_fopen ( tmpfilename, "w+b" );
  if ( ! f ) {
    g_free ( tmpfilename );
    g_remove ( fn ); /* couldn't create temporary. delete 0-byte file. */
    return -4;
  }

  /* Call the backend function */
  ret = curl_download_get_url ( hostname, uri, f, options, ftp );

  if (ret == -1 || ret == 1 || ret == -2 || check_map_file(f))
  {
    g_warning(_("Download error: %s"), fn);
    fclose ( f );
    f = NULL;
    g_remove ( tmpfilename );
    g_free ( tmpfilename );
    g_remove ( fn ); /* couldn't create temporary. delete 0-byte file. */
    return -1;
  }

  fclose ( f );
  f = NULL;
  rename ( tmpfilename, fn ); /* move completely-downloaded file to permanent location */
  g_free ( tmpfilename );
  return ret;
}

/* success = 0, -1 = couldn't connect, -2 HTTP error, -3 file exists, -4 couldn't write to file... */
/* uri: like "/uri.html?whatever" */
/* only reason for the "wrapper" is so we can do redirects. */
int a_http_download_get_url ( const char *hostname, const char *uri, const char *fn, DownloadOptions *opt )
{
  return download ( hostname, uri, fn, opt, FALSE );
}

int a_ftp_download_get_url ( const char *hostname, const char *uri, const char *fn, DownloadOptions *opt )
{
  return download ( hostname, uri, fn, opt, TRUE );
}
Commit	Line	Data
	1	/*
	2	* viking -- GPS Data and Topo Analyzer, Explorer, and Manager
	3	*
	4	* Copyright (C) 2003-2005, Evan Battaglia <gtoevan@gmx.net>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	19	*
	20	*/
	21
	22	#ifdef HAVE_CONFIG_H
	23	#include "config.h"
	24	#endif
	25
	26	#include <stdio.h>
	27	#include <ctype.h>
	28	#include <string.h>
	29	#include <glib.h>
	30	#include <glib/gstdio.h>
	31	#include <glib/gi18n.h>
	32
	33	#include "download.h"
	34
	35	#include "curl_download.h"
	36
	37	static int check_map_file(FILE* f)
	38	{
	39	char **s;
	40	char *bp;
	41	int res = 0; /* good */
	42	fpos_t pos;
	43	char buf[33];
	44	size_t nr;
	45	char * html_str[] = {
	46	"<html",
	47	"<!DOCTYPE html",
	48	"<head",
	49	"<title",
	50	NULL
	51	};
	52
	53
	54	memset(buf, 0, sizeof(buf));
	55	fgetpos(f, &pos);
	56	rewind(f);
	57	nr = fread(buf, 1, sizeof(buf) - 1, f);
	58	fsetpos(f, &pos);
	59	for (bp = buf; (bp < (buf + sizeof(buf) - 1)) && (nr > (bp - buf)); bp++) {
	60	if (!(isspace(*bp)))
	61	break;
	62	}
	63	if ((bp >= (buf + sizeof(buf) -1)) \|\| ((bp - buf) >= nr))
	64	return(res);
	65	for (s = html_str; *s; s++) {
	66	if (strncasecmp(s, bp, strlen(s)) == 0)
	67	return(-1);
	68	}
	69	return(res);
	70	}
	71
	72	static int download( const char hostname, const char uri, const char fn, DownloadOptions options, gboolean ftp)
	73	{
	74	FILE *f;
	75	int ret;
	76	char *tmpfilename;
	77
	78	/* Check file */
	79	if ( g_file_test ( fn, G_FILE_TEST_EXISTS ) == TRUE )
	80	{
	81	/* File exists: return */
	82	return -3;
	83	} else {
	84	gchar *dir = g_path_get_dirname ( fn );
	85	g_mkdir_with_parents ( dir , 0777 );
	86	g_free ( dir );
	87
	88	/* create placeholder file */
	89	if ( ! (f = g_fopen ( fn, "w+b" )) ) /* immediately open file so other threads won't -- prevents race condition */
	90	return -4;
	91	fclose ( f );
	92	f = NULL;
	93	}
	94
	95	tmpfilename = g_strdup_printf("%s.tmp", fn);
	96	f = g_fopen ( tmpfilename, "w+b" );
	97	if ( ! f ) {
	98	g_free ( tmpfilename );
	99	g_remove ( fn ); /* couldn't create temporary. delete 0-byte file. */
	100	return -4;
	101	}
	102
	103	/* Call the backend function */
	104	ret = curl_download_get_url ( hostname, uri, f, options, ftp );
	105
	106	if (ret == -1 \|\| ret == 1 \|\| ret == -2 \|\| check_map_file(f))
	107	{
	108	g_warning(_("Download error: %s"), fn);
	109	fclose ( f );
	110	f = NULL;
	111	g_remove ( tmpfilename );
	112	g_free ( tmpfilename );
	113	g_remove ( fn ); /* couldn't create temporary. delete 0-byte file. */
	114	return -1;
	115	}
	116
	117	fclose ( f );
	118	f = NULL;
	119	rename ( tmpfilename, fn ); /* move completely-downloaded file to permanent location */
	120	g_free ( tmpfilename );
	121	return ret;
	122	}
	123
	124	/* success = 0, -1 = couldn't connect, -2 HTTP error, -3 file exists, -4 couldn't write to file... */
	125	/* uri: like "/uri.html?whatever" */
	126	/* only reason for the "wrapper" is so we can do redirects. */
	127	int a_http_download_get_url ( const char hostname, const char uri, const char fn, DownloadOptions opt )
	128	{
	129	return download ( hostname, uri, fn, opt, FALSE );
	130	}
	131
	132	int a_ftp_download_get_url ( const char hostname, const char uri, const char fn, DownloadOptions opt )
	133	{
	134	return download ( hostname, uri, fn, opt, TRUE );
	135	}