/// <summary>
/// The on update validation ui.
/// </summary>
/// <param name="handler">
/// The handler.
/// </param>
private void OnUpdateValidationUi(ZipFileValidationHandler handler)
{
var info = new DownloadProgressInfo(
handler.TotalBytes, handler.CurrentBytes, handler.TimeRemaining, handler.AverageSpeed);
this.RunOnUiThread(() => this.OnDownloadProgress(info));
}
/// <summary>
/// Ensures that the zip file is valid.
/// </summary>
/// <param name="validationHandler">
/// The class to hold the object for progress reporting
/// </param>
/// <returns>
/// True if the zip is valid, otherwise False.
/// </returns>
public static bool Validate(ZipFileValidationHandler validationHandler)
{
var buf = new byte[1024 * 256];
try
{
var zip = new ZipFile(validationHandler.Filename);
ZipFileEntry[] entries = zip.GetAllEntries();
// First calculate the total compressed length
long totalCompressedLength = entries.Sum(entry => entry.CompressedSize);
float averageVerifySpeed = 0;
long totalBytesRemaining = totalCompressedLength;
validationHandler.TotalBytes = totalCompressedLength;
// Then calculate a CRC for every file in the Zip file,
// comparing it to what is stored in the Zip directory
foreach (ZipFileEntry entry in entries)
{
if (entry.Crc32 != -1)
{
DateTime startTime = DateTime.UtcNow;
var crc = new Crc32();
uint offset = entry.FileOffset;
var length = (int)entry.CompressedSize;
Stream raf = zip.zipFileStream;
raf.Seek(offset, SeekOrigin.Begin);
while (length > 0)
{
int seek = length > buf.Length ? buf.Length : length;
raf.Read(buf, 0, seek);
crc.Update(buf, 0, seek);
length -= seek;
DateTime currentTime = DateTime.UtcNow;
var timePassed = (float)(currentTime - startTime).TotalMilliseconds;
if (timePassed > 0)
{
float currentSpeedSample = seek / timePassed;
if (averageVerifySpeed <= 0)
{
averageVerifySpeed = (SmoothingFactor * currentSpeedSample)
+ ((1 - SmoothingFactor) * averageVerifySpeed);
}
else
{
averageVerifySpeed = currentSpeedSample;
}
totalBytesRemaining -= seek;
var timeRemaining = (long)(totalBytesRemaining / averageVerifySpeed);
validationHandler.AverageSpeed = averageVerifySpeed;
validationHandler.CurrentBytes = totalCompressedLength - totalBytesRemaining;
validationHandler.TimeRemaining = timeRemaining;
validationHandler.UpdateUi(validationHandler);
}
startTime = currentTime;
if (validationHandler.ShouldCancel)
{
return(true);
}
}
if (crc.Value != entry.Crc32)
{
Debug.WriteLine("CRC does not match for entry: " + entry.FilenameInZip);
Debug.WriteLine("In file: " + entry.ZipFileName);
return(false);
}
}
}
}
catch (IOException e)
{
Console.WriteLine(e.ToString());
Console.Write(e.StackTrace);
return(false);
}
return(true);
}
/// <summary>
/// The is valid zip file.
/// </summary>
/// <param name="filename">
/// The filename.
/// </param>
/// <returns>
/// The is valid zip file.
/// </returns>
private bool IsValidZipFile(string filename)
{
this.zipFileValidationHandler = new ZipFileValidationHandler(filename)
{
UpdateUi = this.OnUpdateValidationUi
};
return File.Exists(filename) && ZipFile.Validate(this.zipFileValidationHandler);
}
/// <summary>
/// Ensures that the zip file is valid.
/// </summary>
/// <param name="validationHandler">
/// The class to hold the object for progress reporting
/// </param>
/// <returns>
/// True if the zip is valid, otherwise False.
/// </returns>
public static bool Validate(ZipFileValidationHandler validationHandler)
{
var buf = new byte[1024 * 256];
try
{
var zip = new ZipFile(validationHandler.Filename);
ZipFileEntry[] entries = zip.GetAllEntries();
// First calculate the total compressed length
long totalCompressedLength = entries.Sum(entry => entry.CompressedSize);
float averageVerifySpeed = 0;
long totalBytesRemaining = totalCompressedLength;
validationHandler.TotalBytes = totalCompressedLength;
// Then calculate a CRC for every file in the Zip file,
// comparing it to what is stored in the Zip directory
foreach (ZipFileEntry entry in entries)
{
if (entry.Crc32 != -1)
{
DateTime startTime = DateTime.UtcNow;
var crc = new Crc32();
uint offset = entry.FileOffset;
var length = (int)entry.CompressedSize;
Stream raf = zip.zipFileStream;
raf.Seek(offset, SeekOrigin.Begin);
while (length > 0)
{
int seek = length > buf.Length ? buf.Length : length;
raf.Read(buf, 0, seek);
crc.Update(buf, 0, seek);
length -= seek;
DateTime currentTime = DateTime.UtcNow;
var timePassed = (float)(currentTime - startTime).TotalMilliseconds;
if (timePassed > 0)
{
float currentSpeedSample = seek / timePassed;
if (averageVerifySpeed <= 0)
{
averageVerifySpeed = (SmoothingFactor * currentSpeedSample)
+ ((1 - SmoothingFactor) * averageVerifySpeed);
}
else
{
averageVerifySpeed = currentSpeedSample;
}
totalBytesRemaining -= seek;
var timeRemaining = (long)(totalBytesRemaining / averageVerifySpeed);
validationHandler.AverageSpeed = averageVerifySpeed;
validationHandler.CurrentBytes = totalCompressedLength - totalBytesRemaining;
validationHandler.TimeRemaining = timeRemaining;
validationHandler.UpdateUi(validationHandler);
}
startTime = currentTime;
if (validationHandler.ShouldCancel)
{
return true;
}
}
if (crc.Value != entry.Crc32)
{
Debug.WriteLine("CRC does not match for entry: " + entry.FilenameInZip);
Debug.WriteLine("In file: " + entry.ZipFileName);
return false;
}
}
}
}
catch (IOException e)
{
Console.WriteLine(e.ToString());
Console.Write(e.StackTrace);
return false;
}
return true;
}
