private void TransformEmbeddedPart(EmbeddedPackagePart part, OptimizeDiagnostic diagnostic, ImageOptimizerOptions options, CancellationToken token)
{
// Read mode about office mime types: http://filext.com/faq/office_mime_types.php
var fileType = part.ContentType
switch
{
"application/vnd.openxmlformats-officedocument.wordprocessingml.document" => ".docx",
"application/vnd.openxmlformats-officedocument.presentationml.presentation" => ".pptx",
_ => null
};
if (fileType is null)
{
var message = $"Unsupported embedding type {part.ContentType}";
diagnostic.Errors.Add(new OptimizeError(part.Uri.OriginalString, message));
return;
}
using var result = Transform(fileType, part.GetStream(), out var partDiagnostic, options, token);
result.Position = 0;
part.FeedData(result);
foreach (var error in partDiagnostic.Errors)
{
var pointer = part.Uri.OriginalString + '|' + error.Pointer;
diagnostic.Errors.Add(new OptimizeError(pointer, error.Message));
}
}
private void TransformDocxStream(Stream stream, OptimizeDiagnostic diagnostic, ImageOptimizerOptions options, CancellationToken token)
{
using var document = OpenXmlFactory.OpenWord(stream, true, options.OpenXmlUriAutoRecovery);
var transformation = new OptimizerWord(_memoryStreamManager, options);
transformation.Transform(document, diagnostic, token);
foreach (var part in document.MainDocumentPart.EmbeddedPackageParts)
{
token.ThrowIfCancellationRequested();
TransformEmbeddedPart(part, diagnostic, options, token);
}
}
private void TransformPptxStream(Stream stream, OptimizeDiagnostic diagnostic, ImageOptimizerOptions options, CancellationToken token)
{
using var document = OpenXmlFactory.OpenPowerPoint(stream, true, options.OpenXmlUriAutoRecovery);
var transformation = new OptimizerPowerPoint(_memoryStreamManager, options);
transformation.Transform(document, diagnostic, token);
foreach (var slide in document.PresentationPart.SlideParts)
{
foreach (var part in slide.EmbeddedPackageParts)
{
token.ThrowIfCancellationRequested();
TransformEmbeddedPart(part, diagnostic, options, token);
}
}
}
public Stream Transform(string fileType, Stream stream, out OptimizeDiagnostic diagnostic, ImageOptimizerOptions?options = null, CancellationToken?token = null)
{
options ??= new ImageOptimizerOptions();
diagnostic = new OptimizeDiagnostic();
var cancellationToken = token ?? CancellationToken.None;
// Copy of the original stream that will be modified in-place
var memoryStream = _memoryStreamManager.GetStream();
stream.CopyTo(memoryStream);
switch (fileType.ToLower())
{
case ".pptx":
memoryStream.Position = 0;
TransformPptxStream(memoryStream, diagnostic, options, cancellationToken);
break;
case ".docx":
memoryStream.Position = 0;
TransformDocxStream(memoryStream, diagnostic, options, cancellationToken);
break;
default:
var message = $"ImageOptimizer cannot process {fileType}.";
diagnostic.Errors.Add(new OptimizeError("/", message));
break;
}
memoryStream.Position = 0;
try
{
return(options.ReZipAfterOptimization
? ReZip(memoryStream, cancellationToken)
: memoryStream);
}
catch
{
return(memoryStream); // not Zip archive?
}
}