60%

utils/md5.js

@@ -19,6 +19,14 @@ const toWords = (value) => {
   return words
 }
 
+const toWordsFromBytes = (bytes) => {
+  const words = []
+  for (let index = 0; index < bytes.length; index += 1) {
+    words[index >> 2] |= bytes[index] << ((index % 4) * 8)
+  }
+  return words
+}
+
 const toHex = (words) => {
   const alphabet = '0123456789abcdef'
   let output = ''
@@ -70,3 +78,16 @@ export const calcMD5 = (value) => {
   const utf8Value = unescape(encodeURIComponent(String(value)))
   return toHex(coreMd5(toWords(utf8Value), utf8Value.length * 8))
 }
+
+export const calcMD5Bytes = (value) => {
+  const bytes = value instanceof ArrayBuffer
+    ? new Uint8Array(value)
+    : ArrayBuffer.isView(value)
+      ? new Uint8Array(value.buffer, value.byteOffset, value.byteLength)
+      : null
+  if (!bytes) throw new TypeError('MD5 字节输入必须是 ArrayBuffer 或 TypedArray')
+  if (bytes.length > 0x1fffffff) {
+    throw new RangeError('当前 MD5 实现不支持超过 512MB 的单文件')
+  }
+  return toHex(coreMd5(toWordsFromBytes(bytes), bytes.length * 8))
+}