FileDownloader.cpp

00001 #include "FileDownloader.h"
00002 #include "SDFileSystem.h"
00003 
00004 extern SDFileSystem sd;
00005 HTTPResult result;
00006 bool completed = false;
00007 HTTPClient http;
00008 HTTPStream stream;
00009 
00010 
00011 void request_callback(HTTPResult r) {
00012     result = r;
00013     completed = true;
00014 }
00015 
00016 HTTPResult GetFile(const char *uri, const char *filename, FILE *fp, char * buffer, int buffer_size)
00017 {
00018     
00019     completed = false;
00020 
00021      fp = fopen(filename, "w");
00022      if(fp == NULL) {
00023          error("Could not open file for write\n");
00024      }
00025      else {
00026       printf("Opened file\r\n");
00027      }
00028 
00029 
00030     buffer[buffer_size-1] = 0x00;  
00031     stream.readNext((byte*)buffer, buffer_size-2); //Point to buffer for the first read
00032     HTTPResult r = http.get(uri, &stream, request_callback);
00033     
00034     while (!completed) {
00035         Net::poll(); //Polls the Networking stack
00036         if (stream.readable()) {
00037             buffer[stream.readLen()] = 0; //Transform this buffer in a zero-terminated char* string
00038             
00039             int p=0;
00040             while (buffer[p] != 0)
00041             {
00042                 fprintf(fp,"%c",buffer[p]);
00043                 p++;
00044             }
00045             stream.readNext((byte*)buffer, buffer_size-2); //Buffer has been read, now we can put more data in it
00046         }
00047     }
00048     
00049    fclose(fp);
00050 
00051    return result;
00052 }