It is expected to support InputStream

[linwaiwai]

Since we need to handle real-time image streams, converting the stream to a file for processing with exiftool and then converting it back to a stream introduces significant IO overhead, which is inefficient and wasteful.

   	String tempFileNamePrefix = "exiftool-input-" + UUID.randomUUID().toString();
   	File tempInputFile = File.createTempFile(tempFileNamePrefix,  extension);

   	try {
   	 
   		try (FileOutputStream tempInputFileStream = new FileOutputStream(tempInputFile)) {
   			byte[] buffer = new byte[1024];
   			int bytesRead;
   			while ((bytesRead = inputStream.read(buffer)) != -1) {
   				tempInputFileStream.write(buffer, 0, bytesRead);
   			}
   		}
   		exifTool.setImageMeta(tempInputFile, metadata);   
   		try (FileInputStream tempInputFileStream = new FileInputStream(tempInputFile)) {
   			byte[] buffer = new byte[1024];
   			int bytesRead;
   			while ((bytesRead = tempInputFileStream.read(buffer)) != -1) {
   				outputStream.write(buffer, 0, bytesRead);
   			}
   		}
   	} finally { 
   		tempInputFile.delete();
   	}

[mjeanroy]

This library is "a wrapper" behind the exiftool perl library.

As far as I know, this library only works with files stored on the filesystem. We could imagine piping file bytes to exiftool, but it is not supported in deamon mode (the "stag_open" flag).

I could add a method to support InputStream parameters, but I'll have to copy the file on the filesystem anyway to make sure it works in all cases.

So unless I missed something and you know how to stream bytes to exiftool, you have two choices:

• Ask the exiftool maintainer to implement streaming.
• Fork exiftool and do it by yourself.

Then I'll be happy to make this work.