commit

node_modules/fetch-blob/from.js

@@ -0,0 +1,57 @@
+const {statSync, createReadStream} = require('fs');
+const Blob = require('./index.js');
+const DOMException = require('domexception');
+
+/**
+ * @param {string} path filepath on the disk
+ * @returns {Blob}
+ */
+function blobFrom(path) {
+	const {size, mtime} = statSync(path);
+	const blob = new BlobDataItem({path, size, mtime});
+
+	return new Blob([blob]);
+}
+
+/**
+ * This is a blob backed up by a file on the disk
+ * with minium requirement
+ *
+ * @private
+ */
+class BlobDataItem {
+	constructor(options) {
+		this.size = options.size;
+		this.path = options.path;
+		this.start = options.start;
+		this.mtime = options.mtime;
+	}
+
+	// Slicing arguments is first validated and formated
+	// to not be out of range by Blob.prototype.slice
+	slice(start, end) {
+		return new BlobDataItem({
+			path: this.path,
+			start,
+			mtime: this.mtime,
+			size: end - start
+		});
+	}
+
+	stream() {
+		if (statSync(this.path).mtime > this.mtime) {
+			throw new DOMException('The requested file could not be read, typically due to permission problems that have occurred after a reference to a file was acquired.', 'NotReadableError');
+		}
+
+		return createReadStream(this.path, {
+			start: this.start,
+			end: this.start + this.size - 1
+		});
+	}
+
+	get [Symbol.toStringTag]() {
+		return 'Blob';
+	}
+}
+
+module.exports = blobFrom;