[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"

static gboolean check_file_first_line(FILE* f, gchar *patterns[])
{
  gchar **s;
  gchar *bp;
  fpos_t pos;
  gchar buf[33];
  size_t nr;

  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 = patterns; *s; s++) {
    if (strncasecmp(*s, bp, strlen(*s)) == 0)
      return TRUE;
  }
  return FALSE;
}

gboolean a_check_html_file(FILE* f)
{
  gchar * html_str[] = {
    "<html",
    "<!DOCTYPE html",
    "<head",
    "<title",
    NULL
  };

  return check_file_first_line(f, html_str);
}

gboolean a_check_map_file(FILE* f)
{
  /* FIXME no more true since a_check_kml_file */
  return !a_check_html_file(f);
}

gboolean a_check_kml_file(FILE* f)
{
  gchar * kml_str[] = {
    "<?xml",
    NULL
  };

  return check_file_first_line(f, kml_str);
}

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
388cf5a4	37	static gboolean check_file_first_line(FILE* f, gchar *patterns[])
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;
6e78a423	44
c44594ee	45	memset(buf, 0, sizeof(buf));
6e78a423 QT	46	fgetpos(f, &pos);
	47	rewind(f);
	48	nr = fread(buf, 1, sizeof(buf) - 1, f);
	49	fsetpos(f, &pos);
	50	for (bp = buf; (bp < (buf + sizeof(buf) - 1)) && (nr > (bp - buf)); bp++) {
	51	if (!(isspace(*bp)))
	52	break;
	53	}
	54	if ((bp >= (buf + sizeof(buf) -1)) \|\| ((bp - buf) >= nr))
1ac37c09	55	return FALSE;
388cf5a4	56	for (s = patterns; *s; s++) {
1918a993	57	if (strncasecmp(s, bp, strlen(s)) == 0)
1ac37c09	58	return TRUE;
6e78a423	59	}
1ac37c09 GB	60	return FALSE;
	61	}
	62
388cf5a4 GB	63	gboolean a_check_html_file(FILE* f)
	64	{
	65	gchar * html_str[] = {
	66	"<html",
	67	"<!DOCTYPE html",
	68	"<head",
	69	"<title",
	70	NULL
	71	};
	72
	73	return check_file_first_line(f, html_str);
	74	}
	75
1ac37c09 GB	76	gboolean a_check_map_file(FILE* f)
1ac37c09 GB	77	{
388cf5a4	78	/* FIXME no more true since a_check_kml_file */
1ac37c09	79	return !a_check_html_file(f);
6e78a423 QT	80	}
6e78a423 QT	81
ae941b4c HMJ	82	gboolean a_check_kml_file(FILE* f)
ae941b4c HMJ	83	{
388cf5a4	84	gchar * kml_str[] = {
ae941b4c HMJ	85	"<?xml",
	86	NULL
	87	};
	88
388cf5a4	89	return check_file_first_line(f, kml_str);
ae941b4c HMJ	90	}
ae941b4c HMJ	91
0c1044e9	92	static int download( const char hostname, const char uri, const char fn, DownloadOptions options, gboolean ftp)
932f8f22 GB	93	{
	94	FILE *f;
	95	int ret;
533bbf34	96	gchar *tmpfilename;
1ac37c09	97	gboolean failure = FALSE;
932f8f22 GB	98
932f8f22 GB	99	/* Check file */
45acf79e	100	if ( g_file_test ( fn, G_FILE_TEST_EXISTS ) == TRUE )
932f8f22 GB	101	{
	102	/* File exists: return */
	103	return -3;
	104	} else {
a1618d62 MA	105	gchar *dir = g_path_get_dirname ( fn );
	106	g_mkdir_with_parents ( dir , 0777 );
	107	g_free ( dir );
	108
3335ae4e	109	/* create placeholder file */
8c060406	110	if ( ! (f = g_fopen ( fn, "w+b" )) ) /* immediately open file so other threads won't -- prevents race condition */
932f8f22	111	return -4;
3335ae4e	112	fclose ( f );
8c060406	113	f = NULL;
3335ae4e EB	114	}
	115
	116	tmpfilename = g_strdup_printf("%s.tmp", fn);
8c060406	117	f = g_fopen ( tmpfilename, "w+b" );
3335ae4e EB	118	if ( ! f ) {
3335ae4e EB	119	g_free ( tmpfilename );
8c060406	120	g_remove ( fn ); /* couldn't create temporary. delete 0-byte file. */
3335ae4e	121	return -4;
932f8f22 GB	122	}
	123
	124	/* Call the backend function */
0c1044e9	125	ret = curl_download_get_url ( hostname, uri, f, options, ftp );
1ac37c09 GB	126	if (ret == -1 \|\| ret == 1 \|\| ret == -2) {
	127	g_debug("%s: download failed: curl_download_get_url=%d", __FUNCTION__, ret);
	128	failure = TRUE;
	129	}
	130
	131	if (!failure && options != NULL && options->check_file != NULL && ! options->check_file(f)) {
	132	g_debug("%s: file content checking failed", __FUNCTION__);
	133	failure = TRUE;
	134	}
932f8f22	135
1ac37c09	136	if (failure)
932f8f22	137	{
4258f4e2	138	g_warning(_("Download error: %s"), fn);
932f8f22	139	fclose ( f );
8c060406 MA	140	f = NULL;
8c060406 MA	141	g_remove ( tmpfilename );
3335ae4e	142	g_free ( tmpfilename );
8c060406	143	g_remove ( fn ); /* couldn't create temporary. delete 0-byte file. */
932f8f22 GB	144	return -1;
	145	}
	146
	147	fclose ( f );
8c060406	148	f = NULL;
533bbf34	149	g_rename ( tmpfilename, fn ); /* move completely-downloaded file to permanent location */
3335ae4e	150	g_free ( tmpfilename );
932f8f22 GB	151	return ret;
	152	}
	153
85611cd9 GB	154	/* success = 0, -1 = couldn't connect, -2 HTTP error, -3 file exists, -4 couldn't write to file... */
	155	/* uri: like "/uri.html?whatever" */
	156	/* only reason for the "wrapper" is so we can do redirects. */
80214df2	157	int a_http_download_get_url ( const char hostname, const char uri, const char fn, DownloadOptions opt )
85611cd9	158	{
0c1044e9 EB	159	return download ( hostname, uri, fn, opt, FALSE );
	160	}
	161
	162	int a_ftp_download_get_url ( const char hostname, const char uri, const char fn, DownloadOptions opt )
	163	{
	164	return download ( hostname, uri, fn, opt, TRUE );
85611cd9	165	}