Add extracted source directory and README navigation

extracted-source/node_modules/@smithy/util-stream/dist-cjs/checksum/ChecksumStream.browser.js

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+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.ChecksumStream = void 0;
+const ReadableStreamRef = typeof ReadableStream === "function" ? ReadableStream : function () { };
+class ChecksumStream extends ReadableStreamRef {
+}
+exports.ChecksumStream = ChecksumStream;

extracted-source/node_modules/@smithy/util-stream/dist-cjs/checksum/ChecksumStream.js

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+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.ChecksumStream = void 0;
+const util_base64_1 = require("@smithy/util-base64");
+const stream_1 = require("stream");
+class ChecksumStream extends stream_1.Duplex {
+    expectedChecksum;
+    checksumSourceLocation;
+    checksum;
+    source;
+    base64Encoder;
+    constructor({ expectedChecksum, checksum, source, checksumSourceLocation, base64Encoder, }) {
+        super();
+        if (typeof source.pipe === "function") {
+            this.source = source;
+        }
+        else {
+            throw new Error(`@smithy/util-stream: unsupported source type ${source?.constructor?.name ?? source} in ChecksumStream.`);
+        }
+        this.base64Encoder = base64Encoder ?? util_base64_1.toBase64;
+        this.expectedChecksum = expectedChecksum;
+        this.checksum = checksum;
+        this.checksumSourceLocation = checksumSourceLocation;
+        this.source.pipe(this);
+    }
+    _read(size) { }
+    _write(chunk, encoding, callback) {
+        try {
+            this.checksum.update(chunk);
+            this.push(chunk);
+        }
+        catch (e) {
+            return callback(e);
+        }
+        return callback();
+    }
+    async _final(callback) {
+        try {
+            const digest = await this.checksum.digest();
+            const received = this.base64Encoder(digest);
+            if (this.expectedChecksum !== received) {
+                return callback(new Error(`Checksum mismatch: expected "${this.expectedChecksum}" but received "${received}"` +
+                    ` in response header "${this.checksumSourceLocation}".`));
+            }
+        }
+        catch (e) {
+            return callback(e);
+        }
+        this.push(null);
+        return callback();
+    }
+}
+exports.ChecksumStream = ChecksumStream;

extracted-source/node_modules/@smithy/util-stream/dist-cjs/checksum/createChecksumStream.browser.js

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+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.createChecksumStream = void 0;
+const util_base64_1 = require("@smithy/util-base64");
+const stream_type_check_1 = require("../stream-type-check");
+const ChecksumStream_browser_1 = require("./ChecksumStream.browser");
+const createChecksumStream = ({ expectedChecksum, checksum, source, checksumSourceLocation, base64Encoder, }) => {
+    if (!(0, stream_type_check_1.isReadableStream)(source)) {
+        throw new Error(`@smithy/util-stream: unsupported source type ${source?.constructor?.name ?? source} in ChecksumStream.`);
+    }
+    const encoder = base64Encoder ?? util_base64_1.toBase64;
+    if (typeof TransformStream !== "function") {
+        throw new Error("@smithy/util-stream: unable to instantiate ChecksumStream because API unavailable: ReadableStream/TransformStream.");
+    }
+    const transform = new TransformStream({
+        start() { },
+        async transform(chunk, controller) {
+            checksum.update(chunk);
+            controller.enqueue(chunk);
+        },
+        async flush(controller) {
+            const digest = await checksum.digest();
+            const received = encoder(digest);
+            if (expectedChecksum !== received) {
+                const error = new Error(`Checksum mismatch: expected "${expectedChecksum}" but received "${received}"` +
+                    ` in response header "${checksumSourceLocation}".`);
+                controller.error(error);
+            }
+            else {
+                controller.terminate();
+            }
+        },
+    });
+    source.pipeThrough(transform);
+    const readable = transform.readable;
+    Object.setPrototypeOf(readable, ChecksumStream_browser_1.ChecksumStream.prototype);
+    return readable;
+};
+exports.createChecksumStream = createChecksumStream;

extracted-source/node_modules/@smithy/util-stream/dist-cjs/checksum/createChecksumStream.js

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+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.createChecksumStream = createChecksumStream;
+const stream_type_check_1 = require("../stream-type-check");
+const ChecksumStream_1 = require("./ChecksumStream");
+const createChecksumStream_browser_1 = require("./createChecksumStream.browser");
+function createChecksumStream(init) {
+    if (typeof ReadableStream === "function" && (0, stream_type_check_1.isReadableStream)(init.source)) {
+        return (0, createChecksumStream_browser_1.createChecksumStream)(init);
+    }
+    return new ChecksumStream_1.ChecksumStream(init);
+}