/// <summary>
/// Gets the correct arguments to pass to the compressor
/// </summary>
/// <param name="filePath"> The source file. </param>
/// <param name="fileTempPath"> </param>
/// <param name="algorithm">
/// Default is auto depend on file extension, others is force algorithm
/// </param>
/// <param name="qualityPercent"> Quality PercentSaving - Process </param>
/// <returns> The <see cref="string" /> containing the correct command arguments. </returns>
/// <exception cref="ArgumentException"> file path is invalid </exception>
private static string GetArguments(string filePath, out string fileTempPath, CompressAlgorithm algorithm, int qualityPercent = 0)
{
fileTempPath = null;
ImageCompressorHelper.CheckFilePath(filePath);
qualityPercent = ImageCompressorHelper.GetQualityPercent(qualityPercent, algorithm);
switch (algorithm)
{
case CompressAlgorithm.Gif:
{
return(GetGifCommand(filePath));
}
case CompressAlgorithm.Jpeg:
{
return(GetJpegCommand(filePath, out fileTempPath, qualityPercent));
}
case CompressAlgorithm.PngPrimary:
{
return(GetPngPrimaryCommand(filePath, qualityPercent));
}
}
return(GetPngSecondaryCommand(filePath));
}
/// <summary>
/// Runs the process to optimize the image.
/// </summary>
/// <param name="stream"> </param>
/// <param name="algorithm">
/// Default is auto depend on file extension, others is force algorithm
/// </param>
/// <param name="qualityPercent">
/// Quality of image after compress, 0 is default it mean auto quality by image type
/// </param>
/// <param name="timeout"> TimeoutMillisecond of process in millisecond </param>
/// <returns> The Task containing processing information. </returns>
/// <exception cref="ArgumentException"> stream is invalid image format </exception>
private static ImageCompressResult Process(MemoryStream stream, CompressAlgorithm algorithm, int qualityPercent = 0, int timeout = 0)
{
bool isValidImage = ImageCompressorHelper.TryGetCompressImageType(stream, out var imageType);
if (!isValidImage || imageType == CompressImageType.Invalid)
{
throw new ArgumentException($"{nameof(stream)} is invalid image format", nameof(stream));
}
// Create a source temporary file with the correct extension.
var filePath = FileHelper.CreateTempFile(stream, imageType.AsString(EnumFormat.Description), out _);
ImageCompressResult imageCompressResult = Process(filePath, algorithm, qualityPercent, timeout);
if (imageCompressResult != null)
{
// update file type, because in process not update it
imageCompressResult.FileType = imageType;
}
// Cleanup temp file
FileHelper.SafeDelete(filePath);
return(imageCompressResult);
}
/// <summary>
/// Runs the process to optimize the image.
/// </summary>
/// <param name="stream"> The source image stream. </param>
/// <param name="qualityPercent">
/// Quality of image after compress, 0 is default it mean auto quality by image type
/// </param>
/// <param name="timeout"> TimeoutMillisecond of process in millisecond </param>
/// <returns> The Task containing processing information. </returns>
/// <exception cref="ArgumentException"> stream is invalid image format </exception>
public static ImageCompressResult Compress(MemoryStream stream, int qualityPercent = 0, int timeout = ImageCompressorConstants.TimeoutMillisecond)
{
// Create new stopwatch.
Stopwatch stopwatch = new Stopwatch();
bool isValidImage = ImageCompressorHelper.TryGetCompressImageType(stream, out var imageType);
if (!isValidImage || imageType == CompressImageType.Invalid)
{
throw new ArgumentException($"{nameof(stream)} is invalid image format", nameof(stream));
}
// Handle default value
qualityPercent = ImageCompressorHelper.GetQualityPercent(qualityPercent, imageType);
ImageCompressResult imageCompressResult = null;
// Begin timing.
stopwatch.Start();
bool isCanOptimize = false;
switch (imageType)
{
case CompressImageType.Png:
{
while (qualityPercent > 0)
{
imageCompressResult = Process(stream, CompressAlgorithm.PngPrimary, qualityPercent, timeout);
if (imageCompressResult == null || (imageCompressResult.PercentSaving > 0 && imageCompressResult.PercentSaving < 100))
{
isCanOptimize = true;
break;
}
qualityPercent -= 10;
}
// if quality percent < 0 then try compress by png secondary algorithm (this
// algorithm not related to quality percent)
if (!isCanOptimize)
{
imageCompressResult = Process(stream, CompressAlgorithm.PngSecondary, qualityPercent, timeout);
}
break;
}
case CompressImageType.Jpeg:
{
while (qualityPercent > 0)
{
imageCompressResult = Process(stream, CompressAlgorithm.Jpeg, qualityPercent, timeout);
if (imageCompressResult == null || (imageCompressResult.PercentSaving > 0 && imageCompressResult.PercentSaving < 100))
{
isCanOptimize = true;
break;
}
qualityPercent -= 10;
}
break;
}
case CompressImageType.Gif:
{
while (qualityPercent > 0)
{
imageCompressResult = Process(stream, CompressAlgorithm.Gif, qualityPercent, timeout);
if (imageCompressResult == null || (imageCompressResult.PercentSaving > 0 && imageCompressResult.PercentSaving < 100))
{
isCanOptimize = true;
break;
}
qualityPercent -= 10;
}
break;
}
}
// Stop timing.
stopwatch.Stop();
// if cannot at all, return null
if (imageCompressResult == null)
{
return(null);
}
if (imageCompressResult.PercentSaving > 0 && imageCompressResult.PercentSaving < 100)
{
// update total millisecond took only
imageCompressResult.TotalMillisecondsTook = stopwatch.ElapsedMilliseconds;
}
else
{
// update total millisecond took
imageCompressResult.TotalMillisecondsTook = stopwatch.ElapsedMilliseconds;
// Cannot optimize Use origin for destination => update file size and stream
imageCompressResult.CompressedFileSize = imageCompressResult.OriginalFileSize;
// Copy origin steam to result
imageCompressResult.ResultFileStream.SetLength(0);
stream.Position = 0;
stream.CopyTo(imageCompressResult.ResultFileStream);
}
imageCompressResult.QualityPercent = isCanOptimize ? qualityPercent : 100;
return(imageCompressResult);
}
/// <summary>
/// Runs the process to optimize the image.
/// </summary>
/// <param name="filePath"> The source file. </param>
/// <param name="algorithm">
/// Default is auto depend on file extension, others is force algorithm
/// </param>
/// <param name="qualityPercent">
/// Quality of image after compress, 0 is default it mean auto quality by image type
/// </param>
/// <param name="timeout"> TimeoutMillisecond of process in millisecond </param>
/// <returns> The Task containing processing information. </returns>
/// <exception cref="ArgumentException">
/// file path is invalid, argument of command is invalid
/// </exception>
/// <exception cref="NotSupportedException">
/// Some security policies don't allow execution of programs in this way
/// </exception>
private static ImageCompressResult Process(string filePath, CompressAlgorithm algorithm, int qualityPercent = 0, int timeout = 0)
{
ImageCompressorHelper.CheckFilePath(filePath);
long fileSizeBeforeCompress = new FileInfo(filePath).Length;
ImageCompressResult imageCompressResult = null;
var processInfo = new ProcessStartInfo("cmd")
{
WorkingDirectory = ImageCompressorBootstrapper.Instance.WorkingPath,
Arguments = GetArguments(filePath, out var fileTempPath, algorithm, qualityPercent),
UseShellExecute = false,
CreateNoWindow = true,
WindowStyle = ProcessWindowStyle.Hidden,
RedirectStandardOutput = false,
RedirectStandardError = false,
};
if (IsProcessRunAsUser)
{
System.Security.SecureString runAsPassword = new System.Security.SecureString();
foreach (char c in ProcessRunAsPassword)
{
runAsPassword.AppendChar(c);
}
processInfo.UserName = ProcessRunAsUserName;
processInfo.Password = runAsPassword;
}
if (string.IsNullOrWhiteSpace(processInfo.Arguments))
{
throw new ArgumentException($"Command {nameof(processInfo.Arguments)} is empty", $"{nameof(processInfo.Arguments)}");
}
int elapsedTime = 0;
bool eventHandled = false;
try
{
Process process = new Process
{
StartInfo = processInfo,
EnableRaisingEvents = true
};
process.Exited += (sender, args) =>
{
// Done compress
imageCompressResult = new ImageCompressResult(filePath, fileSizeBeforeCompress);
process.Dispose();
eventHandled = true;
// Remove temp file if have
FileHelper.SafeDelete(fileTempPath);
};
process.Start();
}
catch (System.ComponentModel.Win32Exception ex)
{
throw new NotSupportedException("Some security policies don't allow execution of programs in this way", ex);
}
// Wait for Exited event, but not more than config timeout time.
const int sleepAmount = 100;
while (!eventHandled)
{
elapsedTime += sleepAmount;
if (elapsedTime > timeout && timeout > 0)
{
break;
}
Thread.Sleep(sleepAmount);
}
// update compress result stream
if (imageCompressResult != null)
{
FileHelper.WriteToStream(filePath, imageCompressResult.ResultFileStream);
}
return(imageCompressResult);
}
