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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"

#include "curl_download.h"

#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 (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 ( 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 */
  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\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, 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 );
}

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