public CompressorItextSharp()
{
_factory = new ImageCompressorFactory();
}
private void Run(string filename, string sourceFolder, string destinationFolder, string fileNameWithoutExtension)
{
SourceFolder = sourceFolder;
DestinationFolder = destinationFolder;
var sourcePath = SourceFolder + filename;
if (!File.Exists(sourcePath))
{
throw new ArgumentException(string.Format("PDF file doesn't exist in file system. Validate the full path: \"{0}\"", sourcePath));
}
var destinationPath = $"{DestinationFolder}{fileNameWithoutExtension} comprimido.pdf";
if (!FreeImage.IsAvailable())
{
throw new ApplicationException("FreeImage library isn't available");
}
var _factory = new ImageCompressorFactory();
Logger.LogInfo(string.Format("Start processing of file \"{0}\"", filename));
var timing = Stopwatch.StartNew();
var pdfReader = new PdfReader(sourcePath);
using (var fs = new FileStream(destinationPath, FileMode.Create, FileAccess.Write, FileShare.None))
{
using (var pdfStamper = new PdfStamper(pdfReader, fs))
{
var wasCompressed = false;
var totalPages = pdfReader.NumberOfPages + 1;
Logger.LogInfo(string.Format("Total number of pages is: {0}", totalPages - 1));
for (int i = 1; i < totalPages; i++)
{
PdfDictionary page = pdfReader.GetPageN(i);
PdfDictionary resources = (PdfDictionary)PdfReader.GetPdfObject(page.Get(PdfName.RESOURCES));
PdfDictionary xobject = (PdfDictionary)PdfReader.GetPdfObject(resources.Get(PdfName.XOBJECT));
if (xobject != null)
{
foreach (var name in xobject.Keys)
{
var obj = xobject.Get(name);
if (obj.IsIndirect())
{
var imgObject = (PdfDictionary)PdfReader.GetPdfObject(obj);
if (imgObject != null && imgObject.Get(PdfName.SUBTYPE).Equals(PdfName.IMAGE))
{
var filter = imgObject.Get(PdfName.FILTER);
Logger.LogDebug(string.Format("page num: {0}. Filter {1}", i, filter));
var compressor = _factory.Create(filter, filename, compressionLevel);
if (compressor != null)
{
try
{
compressor.Compress(obj, imgObject, pdfStamper, i);
}
catch (UnsupportedPdfException ex)
{
Logger.LogError(string.Format("Exception at file \"{0}\" on page {1}. {2}", filename, i, ex));
}
catch (KeyNotFoundException ex)
{
Logger.LogError(string.Format("Exception at file \"{0}\" on page {1}. {2}", filename, i, ex));
}
catch (InvalidImageException ex)
{
Logger.LogError(string.Format("Exception at file \"{0}\" on page {1}. {2}", filename, i, ex));
}
}
else
{
Logger.LogWarning(string.Format("Skip compression for {0} type of image", filter));
}
Logger.Log(TraceEventType.Information, string.Format("Image on page {0} compressed successfully", i));
wasCompressed = true;
}
}
}
}
else
{
pdfReader.SetPageContent(i, pdfReader.GetPageContent(i), PdfStream.BEST_COMPRESSION, true);
}
}
if (!wasCompressed)
{
pdfReader.RemoveUnusedObjects();
pdfReader.RemoveAnnotations();
}
}
}
Logger.LogInfo(string.Format("Compression of file \"{0}\" completed on \"{1}\"", filename, timing.Elapsed));
var compression = CalculateCompression(sourcePath, destinationPath);
Logger.LogInfo(string.Format("File was compressed on {0} %", compression));
pdfReader.Close();
}