node_modules: update (#344)

Co-authored-by: dawidd6 <9713907+dawidd6@users.noreply.github.com>

node_modules/nodemailer/dist/cjs/base64/index.d.ts

@@ -24,6 +24,9 @@ export interface EncoderOptions {
 /**
  * Creates a transform stream for encoding data to base64 encoding
  *
+ * The output is the same as `wrap(encode(input), lineLength)` no matter how the input is split
+ * into chunks: every line but the last one ends with a line break, the last one does not
+ *
  * @constructor
  * @param options Stream options
  * @param [options.lineLength=76] Maximum length for lines, set to false to disable wrapping

node_modules/nodemailer/dist/cjs/base64/index.js

@@ -16,6 +16,47 @@ function encode(buffer) {
     }
     return buffer.toString('base64');
 }
+/**
+ * Turns a line length option into a whole number of characters, the default for anything unusable
+ */
+function normalizeLineLength(lineLength) {
+    const length = Math.floor(Number(lineLength));
+    return Number.isFinite(length) && length >= 1 ? length : 76;
+}
+/**
+ * Splits the bytes of `src` into lines of `lineLength` bytes, each followed by a line break. With
+ * `final` set the last line, which may be shorter, gets no line break; otherwise only complete
+ * lines are taken and the rest is left for the caller
+ *
+ * @param src Bytes to wrap
+ * @param lineLength Line length
+ * @param final Whether `src` ends the output
+ * @returns The wrapped bytes and the number of trailing bytes not taken
+ */
+function wrapBuffer(src, lineLength, final) {
+    const lines = Math.ceil(src.length / lineLength);
+    // the last line waits for more data unless this is the end: whether it gets a line break
+    // depends on whether anything follows it
+    const complete = Math.max(lines - 1, 0);
+    let rest = src.length - complete * lineLength;
+    const output = Buffer.allocUnsafe(complete * (lineLength + 2) + (final ? rest : 0));
+    let to = 0;
+    for (let from = 0; from < complete * lineLength; from += lineLength) {
+        src.copy(output, to, from, from + lineLength);
+        to += lineLength;
+        output[to++] = 0x0d;
+        output[to++] = 0x0a;
+    }
+    if (final) {
+        to += src.copy(output, to, complete * lineLength);
+        rest = 0;
+    }
+    if (to !== output.length) {
+        // never hand out bytes of the unfilled allocation
+        throw new Error('Unexpected wrapped length');
+    }
+    return { output, rest };
+}
 /**
  * Adds soft line breaks to a base64 string
  *
@@ -44,6 +85,9 @@ function wrap(str, lineLength) {
 /**
  * Creates a transform stream for encoding data to base64 encoding
  *
+ * The output is the same as `wrap(encode(input), lineLength)` no matter how the input is split
+ * into chunks: every line but the last one ends with a line break, the last one does not
+ *
  * @constructor
  * @param options Stream options
  * @param [options.lineLength=76] Maximum length for lines, set to false to disable wrapping
@@ -53,66 +97,61 @@ class Encoder extends node_stream_1.Transform {
         super();
         this.options = options || {};
         if (this.options.lineLength !== false) {
-            this.options.lineLength = this.options.lineLength || 76;
+            this.options.lineLength = normalizeLineLength(this.options.lineLength);
         }
         this._curLine = '';
         this._remainingBytes = false;
         this.inputBytes = 0;
         this.outputBytes = 0;
     }
+    /**
+     * Emits the encoded characters `b64` that follow the current line, keeping what can not be
+     * emitted yet as the new current line
+     *
+     * @internal
+     */
+    _emit(b64, final) {
+        const src = Buffer.from(this._curLine + b64, 'latin1');
+        if (!src.length) {
+            return;
+        }
+        let output = src;
+        if (this.options.lineLength) {
+            const wrapped = wrapBuffer(src, this.options.lineLength, final);
+            output = wrapped.output;
+            this._curLine = wrapped.rest ? src.toString('latin1', src.length - wrapped.rest) : '';
+        }
+        else {
+            this._curLine = '';
+        }
+        if (output.length) {
+            this.outputBytes += output.length;
+            this.push(output);
+        }
+    }
     /** @internal */
     _transform(chunk, encoding, done) {
         let buf = encoding !== 'buffer' ? Buffer.from(chunk, encoding) : chunk;
         if (!buf || !buf.length) {
-            setImmediate(done);
-            return;
+            return done();
         }
         this.inputBytes += buf.length;
-        if (this._remainingBytes && this._remainingBytes.length) {
+        if (this._remainingBytes) {
             buf = Buffer.concat([this._remainingBytes, buf], this._remainingBytes.length + buf.length);
             this._remainingBytes = false;
         }
-        if (buf.length % 3) {
-            this._remainingBytes = buf.slice(buf.length - (buf.length % 3));
-            buf = buf.slice(0, buf.length - (buf.length % 3));
+        const extra = buf.length % 3;
+        if (extra) {
+            this._remainingBytes = buf.subarray(buf.length - extra);
+            buf = buf.subarray(0, buf.length - extra);
         }
-        else {
-            this._remainingBytes = false;
-        }
-        let b64 = this._curLine + encode(buf);
-        if (this.options.lineLength) {
-            b64 = wrap(b64, this.options.lineLength);
-            // remove last line as it is still most probably incomplete
-            const lastLF = b64.lastIndexOf('\n');
-            if (lastLF < 0) {
-                this._curLine = b64;
-                b64 = '';
-            }
-            else if (lastLF === b64.length - 1) {
-                this._curLine = '';
-            }
-            else {
-                this._curLine = b64.substring(lastLF + 1);
-                b64 = b64.substring(0, lastLF + 1);
-            }
-        }
-        if (b64) {
-            this.outputBytes += b64.length;
-            this.push(Buffer.from(b64, 'ascii'));
-        }
-        setImmediate(done);
+        this._emit(encode(buf), false);
+        done();
     }
     /** @internal */
     _flush(done) {
-        if (this._remainingBytes && this._remainingBytes.length) {
-            this._curLine += encode(this._remainingBytes);
-        }
-        if (this._curLine) {
-            this._curLine = wrap(this._curLine, this.options.lineLength);
-            this.outputBytes += this._curLine.length;
-            this.push(Buffer.from(this._curLine, 'ascii'));
-            this._curLine = '';
-        }
+        this._emit(this._remainingBytes ? encode(this._remainingBytes) : '', true);
+        this._remainingBytes = false;
         done();
     }
 }