Add extracted source directory and README navigation

extracted-source/node_modules/@smithy/util-utf8/dist-cjs/index.js

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+'use strict';
+
+var utilBufferFrom = require('@smithy/util-buffer-from');
+
+const fromUtf8 = (input) => {
+    const buf = utilBufferFrom.fromString(input, "utf8");
+    return new Uint8Array(buf.buffer, buf.byteOffset, buf.byteLength / Uint8Array.BYTES_PER_ELEMENT);
+};
+
+const toUint8Array = (data) => {
+    if (typeof data === "string") {
+        return fromUtf8(data);
+    }
+    if (ArrayBuffer.isView(data)) {
+        return new Uint8Array(data.buffer, data.byteOffset, data.byteLength / Uint8Array.BYTES_PER_ELEMENT);
+    }
+    return new Uint8Array(data);
+};
+
+const toUtf8 = (input) => {
+    if (typeof input === "string") {
+        return input;
+    }
+    if (typeof input !== "object" || typeof input.byteOffset !== "number" || typeof input.byteLength !== "number") {
+        throw new Error("@smithy/util-utf8: toUtf8 encoder function only accepts string | Uint8Array.");
+    }
+    return utilBufferFrom.fromArrayBuffer(input.buffer, input.byteOffset, input.byteLength).toString("utf8");
+};
+
+exports.fromUtf8 = fromUtf8;
+exports.toUint8Array = toUint8Array;
+exports.toUtf8 = toUtf8;

extracted-source/node_modules/@smithy/util-utf8/node_modules/@smithy/util-buffer-from/dist-cjs/index.js

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+'use strict';
+
+var isArrayBuffer = require('@smithy/is-array-buffer');
+var buffer = require('buffer');
+
+const fromArrayBuffer = (input, offset = 0, length = input.byteLength - offset) => {
+    if (!isArrayBuffer.isArrayBuffer(input)) {
+        throw new TypeError(`The "input" argument must be ArrayBuffer. Received type ${typeof input} (${input})`);
+    }
+    return buffer.Buffer.from(input, offset, length);
+};
+const fromString = (input, encoding) => {
+    if (typeof input !== "string") {
+        throw new TypeError(`The "input" argument must be of type string. Received type ${typeof input} (${input})`);
+    }
+    return encoding ? buffer.Buffer.from(input, encoding) : buffer.Buffer.from(input);
+};
+
+exports.fromArrayBuffer = fromArrayBuffer;
+exports.fromString = fromString;

extracted-source/node_modules/@smithy/util-utf8/node_modules/@smithy/util-buffer-from/node_modules/@smithy/is-array-buffer/dist-cjs/index.js

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+'use strict';
+
+const isArrayBuffer = (arg) => (typeof ArrayBuffer === "function" && arg instanceof ArrayBuffer) ||
+    Object.prototype.toString.call(arg) === "[object ArrayBuffer]";
+
+exports.isArrayBuffer = isArrayBuffer;