loader-utils - npm Package Compare versions

Comparing version 3.1.3 to 3.2.0

lib/getHashDigest.js

@@ -14,3 +14,18 @@ "use strict";
 
-function encodeBufferToBase(buffer, base) {
+/**
+ * @param {Uint32Array} uint32Array Treated as a long base-0x100000000 number, little endian
+ * @param {number} divisor The divisor
+ * @return {number} Modulo (remainder) of the division
+ */
+function divmod32(uint32Array, divisor) {
+  let carry = 0;
+  for (let i = uint32Array.length - 1; i >= 0; i--) {
+    const value = carry * 0x100000000 + uint32Array[i];
+    carry = value % divisor;
+    uint32Array[i] = Math.floor(value / divisor);
+  }
+  return carry;
+}
+
+function encodeBufferToBase(buffer, base, length) {
   const encodeTable = baseEncodeTables[base];
@@ -22,23 +37,20 @@
 
-  const readLength = buffer.length;
-  const Big = require("big.js");
+  // Input bits are only enough to generate this many characters
+  const limit = Math.ceil((buffer.length * 8) / Math.log2(base));
+  length = Math.min(length, limit);
 
-  Big.RM = Big.DP = 0;
+  // Most of the crypto digests (if not all) has length a multiple of 4 bytes.
+  // Fewer numbers in the array means faster math.
+  const uint32Array = new Uint32Array(Math.ceil(buffer.length / 4));
 
-  let b = new Big(0);
+  // Make sure the input buffer data is copied and is not mutated by reference.
+  // divmod32() would corrupt the BulkUpdateDecorator cache otherwise.
+  buffer.copy(Buffer.from(uint32Array.buffer));
 
-  for (let i = readLength - 1; i >= 0; i--) {
-    b = b.times(256).plus(buffer[i]);
-  }
-
   let output = "";
 
-  while (b.gt(0)) {
-    output = encodeTable[b.mod(base)] + output;
-    b = b.div(base);
+  for (let i = 0; i < length; i++) {
+    output = encodeTable[divmod32(uint32Array, base)] + output;
   }
 
-  Big.DP = 20;
-  Big.RM = 1;
-
   return output;
@@ -115,6 +127,3 @@ }
   ) {
-    return encodeBufferToBase(hash.digest(), digestType.substr(4)).substr(
-      0,
-      maxLength
-    );
+    return encodeBufferToBase(hash.digest(), digestType.substr(4), maxLength);
   } else {
@@ -121,0 +130,0 @@ return hash.digest(digestType || "hex").substr(0, maxLength);

package.json

 {
   "name": "loader-utils",
-  "version": "3.1.3",
+  "version": "3.2.0",
   "author": "Tobias Koppers @sokra",
   "description": "utils for webpack loaders",
-  "dependencies": {
-    "big.js": "^6.1.1"
-  },
+  "dependencies": {},
   "scripts": {
@@ -10,0 +8,0 @@ "lint": "prettier --list-different . && eslint .",

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Improved metrics

Total package byte prevSize

31937

increased by2.45%

Dependency count

0

decreased by-100%

Lines of code

635

increased by1.6%

Dependency changes

• - Removedbig.js@^6.1.1

• - Removedbig.js@6.2.2(transitive)