add hw2

node_modules/data-uri-to-buffer/dist/common.js

@@ -0,0 +1,54 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.makeDataUriToBuffer = void 0;
+/**
+ * Returns a `Buffer` instance from the given data URI `uri`.
+ *
+ * @param {String} uri Data URI to turn into a Buffer instance
+ */
+const makeDataUriToBuffer = (convert) => (uri) => {
+    uri = String(uri);
+    if (!/^data:/i.test(uri)) {
+        throw new TypeError('`uri` does not appear to be a Data URI (must begin with "data:")');
+    }
+    // strip newlines
+    uri = uri.replace(/\r?\n/g, '');
+    // split the URI up into the "metadata" and the "data" portions
+    const firstComma = uri.indexOf(',');
+    if (firstComma === -1 || firstComma <= 4) {
+        throw new TypeError('malformed data: URI');
+    }
+    // remove the "data:" scheme and parse the metadata
+    const meta = uri.substring(5, firstComma).split(';');
+    let charset = '';
+    let base64 = false;
+    const type = meta[0] || 'text/plain';
+    let typeFull = type;
+    for (let i = 1; i < meta.length; i++) {
+        if (meta[i] === 'base64') {
+            base64 = true;
+        }
+        else if (meta[i]) {
+            typeFull += `;${meta[i]}`;
+            if (meta[i].indexOf('charset=') === 0) {
+                charset = meta[i].substring(8);
+            }
+        }
+    }
+    // defaults to US-ASCII only if type is not provided
+    if (!meta[0] && !charset.length) {
+        typeFull += ';charset=US-ASCII';
+        charset = 'US-ASCII';
+    }
+    // get the encoded data portion and decode URI-encoded chars
+    const data = unescape(uri.substring(firstComma + 1));
+    const buffer = base64 ? convert.base64ToArrayBuffer(data) : convert.stringToBuffer(data);
+    return {
+        type,
+        typeFull,
+        charset,
+        buffer,
+    };
+};
+exports.makeDataUriToBuffer = makeDataUriToBuffer;
+//# sourceMappingURL=common.js.map