src: add node_encoding.cc

Continue moving bits of code out of node.cc ... add node_encoding.cc
as a home for `ParseEncoding` and related functions.

PR-URL: https://github.com/nodejs/node/pull/21112
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>

node.gyp

@@ -333,6 +333,7 @@
         'src/node_contextify.cc',
         'src/node_debug_options.cc',
         'src/node_domain.cc',
+        'src/node_encoding.cc',
         'src/node_errors.h',
         'src/node_file.cc',
         'src/node_http2.cc',

src/node.cc

@@ -770,129 +770,6 @@ Local<Value> MakeCallback(Isolate* isolate,
           .FromMaybe(Local<Value>()));
 }
 
-
-enum encoding ParseEncoding(const char* encoding,
-                            enum encoding default_encoding) {
-  switch (encoding[0]) {
-    case 'u':
-      // utf8, utf16le
-      if (encoding[1] == 't' && encoding[2] == 'f') {
-        // Skip `-`
-        encoding += encoding[3] == '-' ? 4 : 3;
-        if (encoding[0] == '8' && encoding[1] == '\0')
-          return UTF8;
-        if (strncmp(encoding, "16le", 4) == 0)
-          return UCS2;
-
-      // ucs2
-      } else if (encoding[1] == 'c' && encoding[2] == 's') {
-        encoding += encoding[3] == '-' ? 4 : 3;
-        if (encoding[0] == '2' && encoding[1] == '\0')
-          return UCS2;
-      }
-      break;
-    case 'l':
-      // latin1
-      if (encoding[1] == 'a') {
-        if (strncmp(encoding + 2, "tin1", 4) == 0)
-          return LATIN1;
-      }
-      break;
-    case 'b':
-      // binary
-      if (encoding[1] == 'i') {
-        if (strncmp(encoding + 2, "nary", 4) == 0)
-          return LATIN1;
-
-      // buffer
-      } else if (encoding[1] == 'u') {
-        if (strncmp(encoding + 2, "ffer", 4) == 0)
-          return BUFFER;
-      }
-      break;
-    case '\0':
-      return default_encoding;
-    default:
-      break;
-  }
-
-  if (StringEqualNoCase(encoding, "utf8")) {
-    return UTF8;
-  } else if (StringEqualNoCase(encoding, "utf-8")) {
-    return UTF8;
-  } else if (StringEqualNoCase(encoding, "ascii")) {
-    return ASCII;
-  } else if (StringEqualNoCase(encoding, "base64")) {
-    return BASE64;
-  } else if (StringEqualNoCase(encoding, "ucs2")) {
-    return UCS2;
-  } else if (StringEqualNoCase(encoding, "ucs-2")) {
-    return UCS2;
-  } else if (StringEqualNoCase(encoding, "utf16le")) {
-    return UCS2;
-  } else if (StringEqualNoCase(encoding, "utf-16le")) {
-    return UCS2;
-  } else if (StringEqualNoCase(encoding, "latin1")) {
-    return LATIN1;
-  } else if (StringEqualNoCase(encoding, "binary")) {
-    return LATIN1;  // BINARY is a deprecated alias of LATIN1.
-  } else if (StringEqualNoCase(encoding, "buffer")) {
-    return BUFFER;
-  } else if (StringEqualNoCase(encoding, "hex")) {
-    return HEX;
-  } else {
-    return default_encoding;
-  }
-}
-
-
-enum encoding ParseEncoding(Isolate* isolate,
-                            Local<Value> encoding_v,
-                            enum encoding default_encoding) {
-  CHECK(!encoding_v.IsEmpty());
-
-  if (!encoding_v->IsString())
-    return default_encoding;
-
-  node::Utf8Value encoding(isolate, encoding_v);
-
-  return ParseEncoding(*encoding, default_encoding);
-}
-
-Local<Value> Encode(Isolate* isolate,
-                    const char* buf,
-                    size_t len,
-                    enum encoding encoding) {
-  CHECK_NE(encoding, UCS2);
-  Local<Value> error;
-  return StringBytes::Encode(isolate, buf, len, encoding, &error)
-      .ToLocalChecked();
-}
-
-Local<Value> Encode(Isolate* isolate, const uint16_t* buf, size_t len) {
-  Local<Value> error;
-  return StringBytes::Encode(isolate, buf, len, &error)
-      .ToLocalChecked();
-}
-
-// Returns -1 if the handle was not valid for decoding
-ssize_t DecodeBytes(Isolate* isolate,
-                    Local<Value> val,
-                    enum encoding encoding) {
-  HandleScope scope(isolate);
-
-  return StringBytes::Size(isolate, val, encoding);
-}
-
-// Returns number of bytes written.
-ssize_t DecodeWrite(Isolate* isolate,
-                    char* buf,
-                    size_t buflen,
-                    Local<Value> val,
-                    enum encoding encoding) {
-  return StringBytes::Write(isolate, buf, buflen, val, encoding, nullptr);
-}
-
 bool IsExceptionDecorated(Environment* env, Local<Value> er) {
   if (!er.IsEmpty() && er->IsObject()) {
     Local<Object> err_obj = er.As<Object>();

src/node_encoding.cc

@@ -0,0 +1,138 @@
+#include "node.h"
+#include "env.h"
+#include "env-inl.h"
+#include "string_bytes.h"
+#include "util.h"
+#include "util-inl.h"
+#include "v8.h"
+
+namespace node {
+
+using v8::HandleScope;
+using v8::Isolate;
+using v8::Local;
+using v8::Value;
+
+enum encoding ParseEncoding(const char* encoding,
+                            enum encoding default_encoding) {
+  switch (encoding[0]) {
+    case 'u':
+      // utf8, utf16le
+      if (encoding[1] == 't' && encoding[2] == 'f') {
+        // Skip `-`
+        encoding += encoding[3] == '-' ? 4 : 3;
+        if (encoding[0] == '8' && encoding[1] == '\0')
+          return UTF8;
+        if (strncmp(encoding, "16le", 4) == 0)
+          return UCS2;
+
+      // ucs2
+      } else if (encoding[1] == 'c' && encoding[2] == 's') {
+        encoding += encoding[3] == '-' ? 4 : 3;
+        if (encoding[0] == '2' && encoding[1] == '\0')
+          return UCS2;
+      }
+      break;
+    case 'l':
+      // latin1
+      if (encoding[1] == 'a') {
+        if (strncmp(encoding + 2, "tin1", 4) == 0)
+          return LATIN1;
+      }
+      break;
+    case 'b':
+      // binary
+      if (encoding[1] == 'i') {
+        if (strncmp(encoding + 2, "nary", 4) == 0)
+          return LATIN1;
+
+      // buffer
+      } else if (encoding[1] == 'u') {
+        if (strncmp(encoding + 2, "ffer", 4) == 0)
+          return BUFFER;
+      }
+      break;
+    case '\0':
+      return default_encoding;
+    default:
+      break;
+  }
+
+  if (StringEqualNoCase(encoding, "utf8")) {
+    return UTF8;
+  } else if (StringEqualNoCase(encoding, "utf-8")) {
+    return UTF8;
+  } else if (StringEqualNoCase(encoding, "ascii")) {
+    return ASCII;
+  } else if (StringEqualNoCase(encoding, "base64")) {
+    return BASE64;
+  } else if (StringEqualNoCase(encoding, "ucs2")) {
+    return UCS2;
+  } else if (StringEqualNoCase(encoding, "ucs-2")) {
+    return UCS2;
+  } else if (StringEqualNoCase(encoding, "utf16le")) {
+    return UCS2;
+  } else if (StringEqualNoCase(encoding, "utf-16le")) {
+    return UCS2;
+  } else if (StringEqualNoCase(encoding, "latin1")) {
+    return LATIN1;
+  } else if (StringEqualNoCase(encoding, "binary")) {
+    return LATIN1;  // BINARY is a deprecated alias of LATIN1.
+  } else if (StringEqualNoCase(encoding, "buffer")) {
+    return BUFFER;
+  } else if (StringEqualNoCase(encoding, "hex")) {
+    return HEX;
+  } else {
+    return default_encoding;
+  }
+}
+
+
+enum encoding ParseEncoding(Isolate* isolate,
+                            Local<Value> encoding_v,
+                            enum encoding default_encoding) {
+  CHECK(!encoding_v.IsEmpty());
+
+  if (!encoding_v->IsString())
+    return default_encoding;
+
+  Utf8Value encoding(isolate, encoding_v);
+
+  return ParseEncoding(*encoding, default_encoding);
+}
+
+Local<Value> Encode(Isolate* isolate,
+                    const char* buf,
+                    size_t len,
+                    enum encoding encoding) {
+  CHECK_NE(encoding, UCS2);
+  Local<Value> error;
+  return StringBytes::Encode(isolate, buf, len, encoding, &error)
+      .ToLocalChecked();
+}
+
+Local<Value> Encode(Isolate* isolate, const uint16_t* buf, size_t len) {
+  Local<Value> error;
+  return StringBytes::Encode(isolate, buf, len, &error)
+      .ToLocalChecked();
+}
+
+// Returns -1 if the handle was not valid for decoding
+ssize_t DecodeBytes(Isolate* isolate,
+                    Local<Value> val,
+                    enum encoding encoding) {
+  HandleScope scope(isolate);
+
+  return StringBytes::Size(isolate, val, encoding);
+}
+
+// Returns number of bytes written.
+ssize_t DecodeWrite(Isolate* isolate,
+                    char* buf,
+                    size_t buflen,
+                    Local<Value> val,
+                    enum encoding encoding) {
+  return StringBytes::Write(isolate, buf, buflen, val, encoding, nullptr);
+}
+
+}  // namespace node