[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 <errno.h>
#include <ctype.h>
#include <string.h>
#include <strings.h>
#include <gtk/gtk.h>
#include <sys/stat.h>
#include <sys/types.h>

#include "download.h"

#ifdef HAVE_LIBCURL
#include "curl_download.h"
#else
#include "http.h"
#endif

#ifdef WINDOWS

#include <io.h>
#define access(a,b) _access(a,b)
#define close(a) closesocket(a)

char *dirname ( char * dir )
{
  char *tmp = dir + strlen(dir) - 1;
  while ( tmp != dir && *tmp != '\\' )
    tmp--;
  *tmp = '\0';
  return dir;
}

#else

#include <unistd.h>
#include <sys/types.h>

/* dirname */
#include <libgen.h>

#endif 

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
  };


  bzero(buf, 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 (strncmp(*s, bp, strlen(*s)) == 0)
      return(-1);
  }
  return(res);
}

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

  /* Check file */
  if ( access ( fn, F_OK ) == 0 )
  {
    /* File exists: return */
    return -3;
  } else {
    if ( errno == ENOENT)
    {
      char *tmp = g_strdup ( fn );
#ifdef WINDOWS
      mkdir( dirname ( dirname ( tmp ) ) );
      g_free ( tmp ); tmp = g_strdup ( fn );
      mkdir( dirname ( tmp ) );
#else
      mkdir( dirname ( dirname ( tmp ) ), 0777 );
      g_free ( tmp ); tmp = g_strdup ( fn );
      mkdir( dirname ( tmp ), 0777 );
#endif
      g_free ( tmp );
    }
    /* create placeholder file */
    if ( ! (f = fopen ( fn, "w+b" )) ) /* immediately open file so other threads won't -- prevents race condition */
      return -4;
    fclose ( f );
  }

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

  /* Call the backend function */
#ifdef HAVE_LIBCURL
  ret = curl_download_get_url ( hostname, uri, f, options );
#else
  ret = http_download_get_url ( hostname, uri, f, 0, options );
#endif

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

  fclose ( f );
  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 );
}
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 GB	26	#include <stdio.h>
932f8f22 GB	27	#include <errno.h>
6e78a423 QT	28	#include <ctype.h>
	29	#include <string.h>
	30	#include <strings.h>
932f8f22 GB	31	#include <gtk/gtk.h>
	32	#include <sys/stat.h>
	33	#include <sys/types.h>
	34
85611cd9	35	#include "download.h"
3292ba8b GB	36
	37	#ifdef HAVE_LIBCURL
	38	#include "curl_download.h"
	39	#else
85611cd9	40	#include "http.h"
3292ba8b	41	#endif
85611cd9	42
932f8f22 GB	43	#ifdef WINDOWS
	44
	45	#include <io.h>
	46	#define access(a,b) _access(a,b)
	47	#define close(a) closesocket(a)
	48
	49	char dirname ( char dir )
	50	{
	51	char *tmp = dir + strlen(dir) - 1;
	52	while ( tmp != dir && *tmp != '\\' )
	53	tmp--;
	54	*tmp = '\0';
	55	return dir;
	56	}
	57
	58	#else
	59
	60	#include <unistd.h>
	61	#include <sys/types.h>
	62
	63	/* dirname */
	64	#include <libgen.h>
	65
	66	#endif
	67
6e78a423 QT	68	static int check_map_file(FILE* f)
	69	{
	70	char **s;
	71	char *bp;
	72	int res = 0; /* good */
	73	fpos_t pos;
	74	char buf[33];
	75	size_t nr;
	76	char * html_str[] = {
	77	"<html",
	78	"<!DOCTYPE html",
	79	"<head",
	80	"<title",
	81	NULL
	82	};
	83
	84
	85	bzero(buf, sizeof(buf));
	86	fgetpos(f, &pos);
	87	rewind(f);
	88	nr = fread(buf, 1, sizeof(buf) - 1, f);
	89	fsetpos(f, &pos);
	90	for (bp = buf; (bp < (buf + sizeof(buf) - 1)) && (nr > (bp - buf)); bp++) {
	91	if (!(isspace(*bp)))
	92	break;
	93	}
	94	if ((bp >= (buf + sizeof(buf) -1)) \|\| ((bp - buf) >= nr))
	95	return(res);
	96	for (s = html_str; *s; s++) {
	97	if (strncmp(s, bp, strlen(s)) == 0)
	98	return(-1);
	99	}
	100	return(res);
	101	}
	102
a3188993	103	static int download( const char hostname, const char uri, const char fn, DownloadOptions options)
932f8f22 GB	104	{
	105	FILE *f;
	106	int ret;
3335ae4e	107	char *tmpfilename;
932f8f22 GB	108
	109	/* Check file */
	110	if ( access ( fn, F_OK ) == 0 )
	111	{
	112	/* File exists: return */
	113	return -3;
	114	} else {
	115	if ( errno == ENOENT)
	116	{
	117	char *tmp = g_strdup ( fn );
	118	#ifdef WINDOWS
	119	mkdir( dirname ( dirname ( tmp ) ) );
	120	g_free ( tmp ); tmp = g_strdup ( fn );
	121	mkdir( dirname ( tmp ) );
	122	#else
	123	mkdir( dirname ( dirname ( tmp ) ), 0777 );
	124	g_free ( tmp ); tmp = g_strdup ( fn );
	125	mkdir( dirname ( tmp ), 0777 );
	126	#endif
	127	g_free ( tmp );
	128	}
3335ae4e	129	/* create placeholder file */
932f8f22 GB	130	if ( ! (f = fopen ( fn, "w+b" )) ) /* immediately open file so other threads won't -- prevents race condition */
932f8f22 GB	131	return -4;
3335ae4e EB	132	fclose ( f );
	133	}
	134
	135	tmpfilename = g_strdup_printf("%s.tmp", fn);
	136	f = fopen ( tmpfilename, "w+b" );
	137	if ( ! f ) {
	138	g_free ( tmpfilename );
	139	remove ( fn ); /* couldn't create temporary. delete 0-byte file. */
	140	return -4;
932f8f22 GB	141	}
	142
	143	/* Call the backend function */
3292ba8b	144	#ifdef HAVE_LIBCURL
a3188993	145	ret = curl_download_get_url ( hostname, uri, f, options );
3292ba8b	146	#else
a3188993	147	ret = http_download_get_url ( hostname, uri, f, 0, options );
3292ba8b	148	#endif
932f8f22	149
6e78a423	150	if (ret == -1 \|\| ret == 1 \|\| ret == -2 \|\| check_map_file(f))
932f8f22	151	{
6e78a423	152	fprintf(stderr, "Download error: %s\n", fn);
932f8f22	153	fclose ( f );
3335ae4e EB	154	remove ( tmpfilename );
3335ae4e EB	155	g_free ( tmpfilename );
6e78a423	156	remove ( fn ); /* couldn't create temporary. delete 0-byte file. */
932f8f22 GB	157	return -1;
	158	}
	159
	160	fclose ( f );
3335ae4e EB	161	rename ( tmpfilename, fn ); /* move completely-downloaded file to permanent location */
3335ae4e EB	162	g_free ( tmpfilename );
932f8f22 GB	163	return ret;
	164	}
	165
85611cd9 GB	166	/* success = 0, -1 = couldn't connect, -2 HTTP error, -3 file exists, -4 couldn't write to file... */
	167	/* uri: like "/uri.html?whatever" */
	168	/* only reason for the "wrapper" is so we can do redirects. */
80214df2	169	int a_http_download_get_url ( const char hostname, const char uri, const char fn, DownloadOptions opt )
85611cd9	170	{
a3188993	171	return download ( hostname, uri, fn, opt );
85611cd9	172	}