private static void Main()
{
// Necessary paths and URLs.
string startupPath = AppDomain.CurrentDomain.BaseDirectory;
string revisionFile = startupPath + "Revision.txt";
string hostFile = startupPath + "Host.txt";
// Check the host file. If it does not exist, or the
// specified url is blank, let the user know and close the updater.
string baseURL = "";
if (File.Exists(hostFile)) {
baseURL = File.ReadAllText(hostFile);
} else {
File.WriteAllText(hostFile, "");
}
if (baseURL == "") {
CloseProgram("Please write the host you are trying to receive an update from in your Host.txt file.");
}
// Check the revision file. If it does not exist,
// leave the revision at 0 to signify a lack of files.
int clientRevision = 0;
if (File.Exists(revisionFile)) {
clientRevision = Int32.Parse(File.ReadAllText(revisionFile));
}
// Download and convert the folder list into a byte stream and create
// the necessary folders.
var folderList = new DataBuffer(DownloadFile(baseURL + "FolderList.dat"));
int folderCount = folderList.ReadInt();
for (int i = 0; i < folderCount; i++) {
Directory.CreateDirectory(startupPath + folderList.ReadString());
}
// Download and convert the file list into a byte stream.
var fileList = new DataBuffer(DownloadFile(baseURL + "FileList.dat"));
// Get the current product revision as determined by the FileIndexer
// by the number of patch folders, and store it for later use.
int serverRevision = fileList.ReadInt();
// Create a webclient for downloading files and instantly saving them
// onto the disk.
var client = new WebClient();
// Loop through the file list and retrieve information about the required files.
int fileCount = fileList.ReadInt();
for (int i = 0; i < fileCount; i++) {
string clientpath = fileList.ReadString();
string serverpath = fileList.ReadString();
int revision = fileList.ReadInt();
// If the file already exists and the revision it was introduced in
// is older than our current version, then continue to the next
// file in the file list.
if (File.Exists(startupPath + clientpath) && revision <= clientRevision) {
continue;
}
// If the file doesn't exist, or if the file exists but was
// introduced in a newer version than our current version, then download the file.
Console.WriteLine("Downloading " + clientpath);
client.DownloadFile(baseURL + serverpath, startupPath + clientpath);
}
// Store the current revision we installed, and terminate the program
// with a message of success.
File.WriteAllText(revisionFile, serverRevision.ToString());
CloseProgram("Your software is up to date.");
}