From 378ec811c8df431f5b4e7094eb1949476d3a79fe Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Sat, 11 Jun 2011 14:53:03 +0300
Subject: [PATCH] Hide win32-specific stuff in Pipe behind pimpl

---
 source/io/pipe.cpp | 74 +++++++++++++++++++++++++++++-----------------
 source/io/pipe.h   | 11 ++-----
 2 files changed, 50 insertions(+), 35 deletions(-)

diff --git a/source/io/pipe.cpp b/source/io/pipe.cpp
index afa0c25..2975a06 100644
--- a/source/io/pipe.cpp
+++ b/source/io/pipe.cpp
@@ -11,7 +11,21 @@ using namespace std;
 namespace Msp {
 namespace IO {
 
-Pipe::Pipe()
+struct Pipe::Private
+{
+#ifdef WIN32
+	OVERLAPPED *overlapped;
+	Handle event;
+	unsigned buf_size;
+	char *buffer;
+	unsigned buf_avail;
+	char *buf_next;
+#endif
+};
+
+
+Pipe::Pipe():
+	priv(0)
 {
 #ifdef WIN32
 	string name = format("\\\\.\\pipe\\%u.%p", GetCurrentProcessId(), this);
@@ -27,12 +41,13 @@ Pipe::Pipe()
 		throw system_error(format("CreateFile(%s)", name), err);
 	}
 
-	overlapped = 0;
-	event = CreateEvent(0, true, false, 0);
-	buf_size = 1024;
-	buffer = new char[buf_size];
-	buf_avail = 0;
-	buf_next = buffer;
+	priv = new Private;
+	priv->overlapped = 0;
+	priv->event = CreateEvent(0, true, false, 0);
+	priv->buf_size = 1024;
+	priv->buffer = new char[priv->buf_size];
+	priv->buf_avail = 0;
+	priv->buf_next = priv->buffer;
 #else
 	if(pipe(handle)==-1)
 		throw system_error("pipe");
@@ -44,6 +59,11 @@ Pipe::Pipe()
 Pipe::~Pipe()
 {
 	close();
+#ifdef WIN32
+	CloseHandle(priv->event);
+	delete priv->buffer;
+#endif
+	delete priv;
 }
 
 void Pipe::close()
@@ -107,23 +127,23 @@ unsigned Pipe::do_read(char *buf, unsigned size)
 	// Initiate overlapped read if needed
 	get_event_handle();
 
-	if(overlapped)
+	if(priv->overlapped)
 	{
 		DWORD ret;
-		if(!GetOverlappedResult(handle[0], overlapped, &ret, !buf_avail))
+		if(!GetOverlappedResult(handle[0], priv->overlapped, &ret, !priv->buf_avail))
 			throw system_error("GetOverlappedResult");
 		else
 		{
-			buf_avail += ret;
-			delete overlapped;
-			overlapped = 0;
+			priv->buf_avail += ret;
+			delete priv->overlapped;
+			priv->overlapped = 0;
 		}
 	}
 
-	unsigned ret = min(buf_avail, size);
-	memcpy(buf, buf_next, ret);
-	buf_next += ret;
-	buf_avail -= ret;
+	unsigned ret = min(priv->buf_avail, size);
+	memcpy(buf, priv->buf_next, ret);
+	priv->buf_next += ret;
+	priv->buf_avail -= ret;
 
 	// Initiate another overlapped read in case someone is polling us
 	get_event_handle();
@@ -150,15 +170,15 @@ unsigned Pipe::do_read(char *buf, unsigned size)
 Handle Pipe::get_event_handle()
 {
 #ifdef WIN32
-	if(!overlapped && !buf_avail)
+	if(!priv->overlapped && !priv->buf_avail)
 	{
-		overlapped = new OVERLAPPED;
-		memset(overlapped, 0, sizeof(OVERLAPPED));
-		overlapped->hEvent = event;
+		priv->overlapped = new OVERLAPPED;
+		memset(priv->overlapped, 0, sizeof(OVERLAPPED));
+		priv->overlapped->hEvent = priv->event;
 
 		DWORD ret;
-		buf_next = buffer;
-		if(!ReadFile(handle[0], buffer, buf_size, &ret, overlapped))
+		priv->buf_next = priv->buffer;
+		if(!ReadFile(handle[0], priv->buffer, priv->buf_size, &ret, priv->overlapped))
 		{
 			unsigned err = GetLastError();
 			if(err!=ERROR_IO_PENDING)
@@ -166,14 +186,14 @@ Handle Pipe::get_event_handle()
 		}
 		else
 		{
-			buf_avail = ret;
-			delete overlapped;
-			overlapped = 0;
-			SetEvent(event);
+			priv->buf_avail = ret;
+			delete priv->overlapped;
+			priv->overlapped = 0;
+			SetEvent(priv->event);
 		}
 	}
 
-	return event;
+	return priv->event;
 #else
 	return handle[0];
 #endif
diff --git a/source/io/pipe.h b/source/io/pipe.h
index 71edf7e..4e4e42b 100644
--- a/source/io/pipe.h
+++ b/source/io/pipe.h
@@ -9,15 +9,10 @@ namespace IO {
 class Pipe: public Base
 {
 private:
+	struct Private;
+
 	Handle handle[2];
-#ifdef WIN32
-	OVERLAPPED *overlapped;
-	Handle event;
-	unsigned buf_size;
-	char *buffer;
-	unsigned buf_avail;
-	char *buf_next;
-#endif
+	Private *priv;
 
 public:
 	Pipe();
-- 
2.45.2