src/download.c

   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 #include <stdio.h>
  23 #include <errno.h>
  24 #include <gtk/gtk.h>
  25 #include <sys/stat.h>
  26 #include <sys/types.h>
  27
  28 #include "download.h"
  29 #include "http.h"
  30
  31 #ifdef WINDOWS
  32
  33 #include <io.h>
  34 #define access(a,b) _access(a,b)
  35 #define close(a) closesocket(a)
  36
  37 char *dirname ( char * dir )
  38 {
  39   char *tmp = dir + strlen(dir) - 1;
  40   while ( tmp != dir && *tmp != '\\' )
  41     tmp--;
  42   *tmp = '\0';
  43   return dir;
  44 }
  45
  46 #else
  47
  48 #include <unistd.h>
  49 #include <sys/types.h>
  50
  51 /* dirname */
  52 #include <libgen.h>
  53
  54 #endif
  55
  56 static int download( const char *hostname, const char *uri, const char *fn, int sendhostname)
  57 {
  58   FILE *f;
  59   int ret;
  60
  61   /* Check file */
  62   if ( access ( fn, F_OK ) == 0 )
  63   {
  64     /* File exists: return */
  65     return -3;
  66   } else {
  67     if ( errno == ENOENT)
  68     {
  69       char *tmp = g_strdup ( fn );
  70 #ifdef WINDOWS
  71       mkdir( dirname ( dirname ( tmp ) ) );
  72       g_free ( tmp ); tmp = g_strdup ( fn );
  73       mkdir( dirname ( tmp ) );
  74 #else
  75       mkdir( dirname ( dirname ( tmp ) ), 0777 );
  76       g_free ( tmp ); tmp = g_strdup ( fn );
  77       mkdir( dirname ( tmp ), 0777 );
  78 #endif
  79       g_free ( tmp );
  80     }
  81     if ( ! (f = fopen ( fn, "w+b" )) ) /* immediately open file so other threads won't -- prevents race condition */
  82       return -4;
  83   }
  84
  85   /* Call the backend function */
  86   ret = http_download_get_url ( hostname, uri, f, 0, sendhostname );
  87
  88   if (ret == -1 || ret == 1 || ret == -2)
  89   {
  90     fclose ( f );
  91     remove ( fn );
  92     return -1;
  93   }
  94
  95   fclose ( f );
  96   return ret;
  97 }
  98
  99 /* success = 0, -1 = couldn't connect, -2 HTTP error, -3 file exists, -4 couldn't write to file... */
 100 /* uri: like "/uri.html?whatever" */
 101 /* only reason for the "wrapper" is so we can do redirects. */
 102 int a_http_download_get_url ( const char *hostname, const char *uri, const char *fn )
 103 {
 104   return download ( hostname, uri, fn, 1 );
 105 }
 106
 107 int a_http_download_get_url_nohostname ( const char *hostname, const char *uri, const char *fn )
 108 {
 109   return download ( hostname, uri, fn, 0 );
 110 }