refactor(encoding): simplify ucs2, utf8 & utf16le

Author: tony-go

src/api/encoding.cc

@@ -15,32 +15,14 @@ enum encoding ParseEncoding(const char* encoding,
   switch (encoding[0]) {
     case 'u':
     case 'U':
-      // utf8, utf16le
-      if (encoding[1] == 't' && encoding[2] == 'f') {
-        // Skip `-`
-        const size_t skip = encoding[3] == '-' ? 4 : 3;
-        if (encoding[skip] == '8' && encoding[skip + 1] == '\0')
-          return UTF8;
-        if (strncmp(encoding + skip, "16le", 5) == 0)
-          return UCS2;
-      // ucs2
-      } else if (encoding[1] == 'c' && encoding[2] == 's') {
-        const size_t skip = encoding[3] == '-' ? 4 : 3;
-        if (encoding[skip] == '2' && encoding[skip + 1] == '\0')
-          return UCS2;
-      }
-      if (StringEqualNoCase(encoding, "utf8"))
-        return UTF8;
-      if (StringEqualNoCase(encoding, "utf-8"))
-        return UTF8;
-      if (StringEqualNoCase(encoding, "ucs2"))
-        return UCS2;
-      if (StringEqualNoCase(encoding, "ucs-2"))
-        return UCS2;
-      if (StringEqualNoCase(encoding, "utf16le"))
-        return UCS2;
-      if (StringEqualNoCase(encoding, "utf-16le"))
+      if (StringEqualNoCase(encoding, "ucs2") ||
+          StringEqualNoCase(encoding, "ucs-2") ||
+          StringEqualNoCase(encoding, "utf16le") ||
+          StringEqualNoCase(encoding, "utf-16le"))
         return UCS2;
+      if (StringEqualNoCase(encoding, "utf8") ||
+          StringEqualNoCase(encoding, "utf-8"))
+        return UTF8;
       break;
 
     case 'l':

test/addons/parse-encoding/test.js

@@ -14,10 +14,14 @@ assert.strictEqual(parseEncoding('buffer'), 'BUFFER');
 assert.strictEqual(parseEncoding('hex'), 'HEX');
 assert.strictEqual(parseEncoding('latin1'), 'LATIN1');
 assert.strictEqual(parseEncoding('ucs2'), 'UCS2');
+assert.strictEqual(parseEncoding('ucs-2'), 'UCS2');
 assert.strictEqual(parseEncoding('utf8'), 'UTF8');
+assert.strictEqual(parseEncoding('utf-8'), 'UTF8');
+assert.strictEqual(parseEncoding('utf16le'), 'UCS2');
 assert.strictEqual(parseEncoding('utf-16LE'), 'UCS2');
+
 assert.strictEqual(parseEncoding('utf-buffer'), 'UNKNOWN');
 assert.strictEqual(parseEncoding('utf-16leNOT'), 'UNKNOWN');
-
 assert.strictEqual(parseEncoding('linary'), 'UNKNOWN');
 assert.strictEqual(parseEncoding('luffer'), 'UNKNOWN');
+