src: remove void* -> char* -> void* casts

When passing the return value of `BackingStore::Data()` as the first or
second argument to `memcpy()`, it is unnecessary to cast the returned
pointer to `char*`.

Refs: #52292
PR-URL: #57791
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Gerhard Stöbich <deb2001-github@yahoo.de>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>

Author: tniessen

src/crypto/crypto_cipher.cc

@@ -716,9 +716,7 @@ CipherBase::UpdateResult CipherBase::Update(
   } else if (static_cast<size_t>(buf_len) != (*out)->ByteLength()) {
     std::unique_ptr<BackingStore> old_out = std::move(*out);
     *out = ArrayBuffer::NewBackingStore(env()->isolate(), buf_len);
-    memcpy(static_cast<char*>((*out)->Data()),
-           static_cast<char*>(old_out->Data()),
-           buf_len);
+    memcpy((*out)->Data(), old_out->Data(), buf_len);
   }
 
   // When in CCM mode, EVP_CipherUpdate will fail if the authentication tag is
@@ -814,9 +812,7 @@ bool CipherBase::Final(std::unique_ptr<BackingStore>* out) {
     } else if (static_cast<size_t>(out_len) != (*out)->ByteLength()) {
       std::unique_ptr<BackingStore> old_out = std::move(*out);
       *out = ArrayBuffer::NewBackingStore(env()->isolate(), out_len);
-      memcpy(static_cast<char*>((*out)->Data()),
-             static_cast<char*>(old_out->Data()),
-             out_len);
+      memcpy((*out)->Data(), old_out->Data(), out_len);
     }
 
     if (ok && kind_ == kCipher && IsAuthenticatedMode()) {
@@ -892,9 +888,7 @@ bool PublicKeyCipher::Cipher(
     *out = ArrayBuffer::NewBackingStore(env->isolate(), 0);
   } else {
     *out = ArrayBuffer::NewBackingStore(env->isolate(), buf.size());
-    memcpy(static_cast<char*>((*out)->Data()),
-           static_cast<char*>(buf.get()),
-           buf.size());
+    memcpy((*out)->Data(), buf.get(), buf.size());
   }
 
   return true;

src/crypto/crypto_sig.cc

@@ -101,9 +101,7 @@ std::unique_ptr<BackingStore> Node_SignFinal(Environment* env,
     if (sig_buf.len < sig->ByteLength()) {
       auto new_sig = ArrayBuffer::NewBackingStore(env->isolate(), sig_buf.len);
       if (sig_buf.len > 0) [[likely]] {
-        memcpy(static_cast<char*>(new_sig->Data()),
-               static_cast<char*>(sig->Data()),
-               sig_buf.len);
+        memcpy(new_sig->Data(), sig->Data(), sig_buf.len);
       }
       sig = std::move(new_sig);
     }

src/node_buffer.cc

@@ -329,9 +329,7 @@ MaybeLocal<Object> New(Isolate* isolate,
       if (actual < length) {
         std::unique_ptr<BackingStore> old_store = std::move(store);
         store = ArrayBuffer::NewBackingStore(isolate, actual);
-        memcpy(static_cast<char*>(store->Data()),
-               static_cast<char*>(old_store->Data()),
-               actual);
+        memcpy(store->Data(), old_store->Data(), actual);
       }
       Local<ArrayBuffer> buf = ArrayBuffer::New(isolate, std::move(store));
       Local<Object> obj;

src/node_http2.cc

@@ -2084,9 +2084,7 @@ void Http2Session::OnStreamRead(ssize_t nread, const uv_buf_t& buf_) {
     // Shrink to the actual amount of used data.
     std::unique_ptr<BackingStore> old_bs = std::move(bs);
     bs = ArrayBuffer::NewBackingStore(env()->isolate(), nread);
-    memcpy(static_cast<char*>(bs->Data()),
-           static_cast<char*>(old_bs->Data()),
-           nread);
+    memcpy(bs->Data(), old_bs->Data(), nread);
   } else {
     // This is a very unlikely case, and should only happen if the ReadStart()
     // call in OnStreamAfterWrite() immediately provides data. If that does

src/stream_base.cc

@@ -401,7 +401,7 @@ int StreamBase::WriteString(const FunctionCallbackInfo<Value>& args) {
     // Copy partial data
     bs = ArrayBuffer::NewBackingStore(
         isolate, buf.len, BackingStoreInitializationMode::kUninitialized);
-    memcpy(static_cast<char*>(bs->Data()), buf.base, buf.len);
+    memcpy(bs->Data(), buf.base, buf.len);
     data_size = buf.len;
   } else {
     // Write it
@@ -709,9 +709,7 @@ void EmitToJSStreamListener::OnStreamRead(ssize_t nread, const uv_buf_t& buf_) {
   if (static_cast<size_t>(nread) != bs->ByteLength()) {
     std::unique_ptr<BackingStore> old_bs = std::move(bs);
     bs = ArrayBuffer::NewBackingStore(isolate, nread);
-    memcpy(static_cast<char*>(bs->Data()),
-           static_cast<char*>(old_bs->Data()),
-           nread);
+    memcpy(bs->Data(), old_bs->Data(), nread);
   }
 
   stream->CallJSOnreadMethod(nread, ArrayBuffer::New(isolate, std::move(bs)));

src/udp_wrap.cc

@@ -760,9 +760,7 @@ void UDPWrap::OnRecv(ssize_t nread,
     CHECK_LE(static_cast<size_t>(nread), bs->ByteLength());
     std::unique_ptr<BackingStore> old_bs = std::move(bs);
     bs = ArrayBuffer::NewBackingStore(isolate, nread);
-    memcpy(static_cast<char*>(bs->Data()),
-           static_cast<char*>(old_bs->Data()),
-           nread);
+    memcpy(bs->Data(), old_bs->Data(), nread);
   }
 
   Local<Object> address;