BlobWriter has no mime type when i read a image from docx file

[millet0328]

In the brower, when i read a image from docx file (zip file)，BlobWriter has no mime type。is there any other way I can't notice?

<div class="hstack p-2 gap-2 bg-light">
	<input id="files" type="file" class="form-control" accept=".docx"/>
</div>

	const fileInput = document.querySelector("#files");

	async function renderDocx(file) {
		let reader = new zip.ZipReader(new zip.BlobReader(file));
		const entries = await reader.getEntries();
		let blobWriter = new zip.BlobWriter();
		let image = await entries.find((entry) => entry.filename === "word/media/image1.png").getData(blobWriter);
		console.log(image);
	}

	fileInput.addEventListener("change", ev => {
		renderDocx(fileInput.files[0]);
	});

I think we can detect the mime type by the magic number in buffer, just like file-type

[gildas-lormeau]

zip.js provides a function getMimeType(). You can use it to pass the MIME type to the BlobWriter() constructor.

[millet0328]

I understand, thanks for your response.