Add extracted source directory and README navigation

extracted-source/node_modules/@smithy/util-body-length-node/dist-cjs/index.js

@@ -0,0 +1,32 @@
+'use strict';
+
+var node_fs = require('node:fs');
+
+const calculateBodyLength = (body) => {
+    if (!body) {
+        return 0;
+    }
+    if (typeof body === "string") {
+        return Buffer.byteLength(body);
+    }
+    else if (typeof body.byteLength === "number") {
+        return body.byteLength;
+    }
+    else if (typeof body.size === "number") {
+        return body.size;
+    }
+    else if (typeof body.start === "number" && typeof body.end === "number") {
+        return body.end + 1 - body.start;
+    }
+    else if (body instanceof node_fs.ReadStream) {
+        if (body.path != null) {
+            return node_fs.lstatSync(body.path).size;
+        }
+        else if (typeof body.fd === "number") {
+            return node_fs.fstatSync(body.fd).size;
+        }
+    }
+    throw new Error(`Body Length computation failed for ${body}`);
+};
+
+exports.calculateBodyLength = calculateBodyLength;