input/plugins: make InputStream the base class

Prepare for adding virtual methods.

src/input/ThreadInputStream.cxx

@@ -52,30 +52,30 @@ ThreadInputStream::Start(Error &error)
 	if (!thread.Start(ThreadFunc, this, error))
 		return nullptr;
 
-	return &base;
+	return this;
 }
 
 inline void
 ThreadInputStream::ThreadFunc()
 {
-	FormatThreadName("input:%s", base.GetPlugin().name);
+	FormatThreadName("input:%s", GetPlugin().name);
 
 	Lock();
 	if (!Open(postponed_error)) {
-		base.cond.broadcast();
+		cond.broadcast();
 		Unlock();
 		return;
 	}
 
 	/* we're ready, tell it to our client */
-	base.SetReady();
+	SetReady();
 
 	while (!close) {
 		assert(!postponed_error.IsDefined());
 
 		auto w = buffer->Write();
 		if (w.IsEmpty()) {
-			wake_cond.wait(base.mutex);
+			wake_cond.wait(mutex);
 		} else {
 			Unlock();
 
@@ -83,7 +83,7 @@ ThreadInputStream::ThreadFunc()
 			size_t nbytes = Read(w.data, w.size, error);
 
 			Lock();
-			base.cond.broadcast();
+			cond.broadcast();
 
 			if (nbytes == 0) {
 				eof = true;
@@ -121,7 +121,8 @@ ThreadInputStream::Check2(Error &error)
 bool
 ThreadInputStream::Check(InputStream *is, Error &error)
 {
-	return Cast(is)->Check2(error);
+	ThreadInputStream &tis = *(ThreadInputStream *)is;
+	return tis.Check2(error);
 }
 
 inline bool
@@ -133,11 +134,12 @@ ThreadInputStream::Available2()
 bool
 ThreadInputStream::Available(InputStream *is)
 {
-	return Cast(is)->Available2();
+	ThreadInputStream &tis = *(ThreadInputStream *)is;
+	return tis.Available2();
 }
 
 inline size_t
-ThreadInputStream::Read2(void *ptr, size_t size, Error &error)
+ThreadInputStream::Read2(void *ptr, size_t read_size, Error &error)
 {
 	while (true) {
 		if (postponed_error.IsDefined()) {
@@ -147,18 +149,18 @@ ThreadInputStream::Read2(void *ptr, size_t size, Error &error)
 
 		auto r = buffer->Read();
 		if (!r.IsEmpty()) {
-			size_t nbytes = std::min(size, r.size);
+			size_t nbytes = std::min(read_size, r.size);
 			memcpy(ptr, r.data, nbytes);
 			buffer->Consume(nbytes);
 			wake_cond.broadcast();
-			base.offset += nbytes;
+			offset += nbytes;
 			return nbytes;
 		}
 
 		if (eof)
 			return 0;
 
-		base.cond.wait(base.mutex);
+		cond.wait(mutex);
 	}
 }
 
@@ -166,7 +168,8 @@ size_t
 ThreadInputStream::Read(InputStream *is, void *ptr, size_t size,
 			Error &error)
 {
-	return Cast(is)->Read2(ptr, size, error);
+	ThreadInputStream &tis = *(ThreadInputStream *)is;
+	return tis.Read2(ptr, size, error);
 }
 
 inline void
@@ -187,7 +190,8 @@ ThreadInputStream::Close2()
 void
 ThreadInputStream::Close(InputStream *is)
 {
-	Cast(is)->Close2();
+	ThreadInputStream &tis = *(ThreadInputStream *)is;
+	tis.Close2();
 }
 
 inline bool
@@ -199,5 +203,6 @@ ThreadInputStream::IsEOF2()
 bool
 ThreadInputStream::IsEOF(InputStream *is)
 {
-	return Cast(is)->IsEOF2();
+	ThreadInputStream &tis = *(ThreadInputStream *)is;
+	return tis.IsEOF2();
 }