1 files changed, 69 insertions, 0 deletions
diff --git a/node_modules/loader-utils/lib/getHashDigest.js b/node_modules/loader-utils/lib/getHashDigest.js
new file mode 100644
index 0000000..bbc4e03
--- /dev/null
+++ b/node_modules/loader-utils/lib/getHashDigest.js
@@ -0,0 +1,69 @@
+'use strict';
+
+const baseEncodeTables = {
+  26: 'abcdefghijklmnopqrstuvwxyz',
+  32: '123456789abcdefghjkmnpqrstuvwxyz', // no 0lio
+  36: '0123456789abcdefghijklmnopqrstuvwxyz',
+  49: 'abcdefghijkmnopqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ', // no lIO
+  52: 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ',
+  58: '123456789abcdefghijkmnopqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ', // no 0lIO
+  62: '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ',
+  64: '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-_',
+};
+
+function encodeBufferToBase(buffer, base) {
+  const encodeTable = baseEncodeTables[base];
+  if (!encodeTable) {
+    throw new Error('Unknown encoding base' + base);
+  }
+
+  const readLength = buffer.length;
+  const Big = require('big.js');
+
+  Big.RM = Big.DP = 0;
+  let b = new Big(0);
+
+  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);
+  }
+
+  Big.DP = 20;
+  Big.RM = 1;
+
+  return output;
+}
+
+function getHashDigest(buffer, hashType, digestType, maxLength) {
+  hashType = hashType || 'md5';
+  maxLength = maxLength || 9999;
+
+  const hash = require('crypto').createHash(hashType);
+
+  hash.update(buffer);
+
+  if (
+    digestType === 'base26' ||
+    digestType === 'base32' ||
+    digestType === 'base36' ||
+    digestType === 'base49' ||
+    digestType === 'base52' ||
+    digestType === 'base58' ||
+    digestType === 'base62' ||
+    digestType === 'base64'
+  ) {
+    return encodeBufferToBase(hash.digest(), digestType.substr(4)).substr(
+      0,
+      maxLength
+    );
+  } else {
+    return hash.digest(digestType || 'hex').substr(0, maxLength);
+  }
+}
+
+module.exports = getHashDigest;