[andy/viking.git] / 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"

gboolean a_check_html_file(FILE* f)
{
  gchar **s;
  gchar *bp;
  fpos_t pos;
  gchar buf[33];
  size_t nr;
  gchar * 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 FALSE;
  for (s = html_str; *s; s++) {
    if (strncasecmp(*s, bp, strlen(*s)) == 0)
      return TRUE;
  }
  return FALSE;
}

gboolean a_check_map_file(FILE* f)
{
  return !a_check_html_file(f);
}

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

  /* 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) {
    g_debug("%s: download failed: curl_download_get_url=%d", __FUNCTION__, ret);
    failure = TRUE;
  }

  if (!failure && options != NULL && options->check_file != NULL && ! options->check_file(f)) {
    g_debug("%s: file content checking failed", __FUNCTION__);
    failure = TRUE;
  }

  if (failure)
  {
    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;
  g_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
85611cd9 GB	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
3292ba8b GB	22	#ifdef HAVE_CONFIG_H
	23	#include "config.h"
	24	#endif
	25
932f8f22	26	#include <stdio.h>
6e78a423 QT	27	#include <ctype.h>
6e78a423 QT	28	#include <string.h>
f83131b9 MA	29	#include <glib.h>
f83131b9 MA	30	#include <glib/gstdio.h>
4c77d5e0	31	#include <glib/gi18n.h>
932f8f22	32
85611cd9	33	#include "download.h"
3292ba8b	34
3292ba8b	35	#include "curl_download.h"
85611cd9	36
1ac37c09	37	gboolean a_check_html_file(FILE* f)
6e78a423	38	{
533bbf34 MA	39	gchar **s;
533bbf34 MA	40	gchar *bp;
6e78a423	41	fpos_t pos;
533bbf34	42	gchar buf[33];
6e78a423	43	size_t nr;
533bbf34	44	gchar * html_str[] = {
6e78a423 QT	45	"<html",
	46	"<!DOCTYPE html",
	47	"<head",
	48	"<title",
	49	NULL
	50	};
	51
c44594ee	52	memset(buf, 0, sizeof(buf));
6e78a423 QT	53	fgetpos(f, &pos);
	54	rewind(f);
	55	nr = fread(buf, 1, sizeof(buf) - 1, f);
	56	fsetpos(f, &pos);
	57	for (bp = buf; (bp < (buf + sizeof(buf) - 1)) && (nr > (bp - buf)); bp++) {
	58	if (!(isspace(*bp)))
	59	break;
	60	}
	61	if ((bp >= (buf + sizeof(buf) -1)) \|\| ((bp - buf) >= nr))
1ac37c09	62	return FALSE;
6e78a423	63	for (s = html_str; *s; s++) {
1918a993	64	if (strncasecmp(s, bp, strlen(s)) == 0)
1ac37c09	65	return TRUE;
6e78a423	66	}
1ac37c09 GB	67	return FALSE;
	68	}
	69
	70	gboolean a_check_map_file(FILE* f)
	71	{
	72	return !a_check_html_file(f);
6e78a423 QT	73	}
6e78a423 QT	74
0c1044e9	75	static int download( const char hostname, const char uri, const char fn, DownloadOptions options, gboolean ftp)
932f8f22 GB	76	{
	77	FILE *f;
	78	int ret;
533bbf34	79	gchar *tmpfilename;
1ac37c09	80	gboolean failure = FALSE;
932f8f22 GB	81
932f8f22 GB	82	/* Check file */
45acf79e	83	if ( g_file_test ( fn, G_FILE_TEST_EXISTS ) == TRUE )
932f8f22 GB	84	{
	85	/* File exists: return */
	86	return -3;
	87	} else {
a1618d62 MA	88	gchar *dir = g_path_get_dirname ( fn );
	89	g_mkdir_with_parents ( dir , 0777 );
	90	g_free ( dir );
	91
3335ae4e	92	/* create placeholder file */
8c060406	93	if ( ! (f = g_fopen ( fn, "w+b" )) ) /* immediately open file so other threads won't -- prevents race condition */
932f8f22	94	return -4;
3335ae4e	95	fclose ( f );
8c060406	96	f = NULL;
3335ae4e EB	97	}
	98
	99	tmpfilename = g_strdup_printf("%s.tmp", fn);
8c060406	100	f = g_fopen ( tmpfilename, "w+b" );
3335ae4e EB	101	if ( ! f ) {
3335ae4e EB	102	g_free ( tmpfilename );
8c060406	103	g_remove ( fn ); /* couldn't create temporary. delete 0-byte file. */
3335ae4e	104	return -4;
932f8f22 GB	105	}
	106
	107	/* Call the backend function */
0c1044e9	108	ret = curl_download_get_url ( hostname, uri, f, options, ftp );
1ac37c09 GB	109	if (ret == -1 \|\| ret == 1 \|\| ret == -2) {
	110	g_debug("%s: download failed: curl_download_get_url=%d", __FUNCTION__, ret);
	111	failure = TRUE;
	112	}
	113
	114	if (!failure && options != NULL && options->check_file != NULL && ! options->check_file(f)) {
	115	g_debug("%s: file content checking failed", __FUNCTION__);
	116	failure = TRUE;
	117	}
932f8f22	118
1ac37c09	119	if (failure)
932f8f22	120	{
4258f4e2	121	g_warning(_("Download error: %s"), fn);
932f8f22	122	fclose ( f );
8c060406 MA	123	f = NULL;
8c060406 MA	124	g_remove ( tmpfilename );
3335ae4e	125	g_free ( tmpfilename );
8c060406	126	g_remove ( fn ); /* couldn't create temporary. delete 0-byte file. */
932f8f22 GB	127	return -1;
	128	}
	129
	130	fclose ( f );
8c060406	131	f = NULL;
533bbf34	132	g_rename ( tmpfilename, fn ); /* move completely-downloaded file to permanent location */
3335ae4e	133	g_free ( tmpfilename );
932f8f22 GB	134	return ret;
	135	}
	136
85611cd9 GB	137	/* success = 0, -1 = couldn't connect, -2 HTTP error, -3 file exists, -4 couldn't write to file... */
	138	/* uri: like "/uri.html?whatever" */
	139	/* only reason for the "wrapper" is so we can do redirects. */
80214df2	140	int a_http_download_get_url ( const char hostname, const char uri, const char fn, DownloadOptions opt )
85611cd9	141	{
0c1044e9 EB	142	return download ( hostname, uri, fn, opt, FALSE );
	143	}
	144
	145	int a_ftp_download_get_url ( const char hostname, const char uri, const char fn, DownloadOptions opt )
	146	{
	147	return download ( hostname, uri, fn, opt, TRUE );
85611cd9	148	}