From 965148b43b5b859934b7af2e8447ba1026a43a19 Mon Sep 17 00:00:00 2001
From: Pixel <pixel@nobis-crew.org>
Date: Mon, 10 Oct 2011 19:36:55 -0700
Subject: Adding the basic "Handle" structure, and adding an early version of
 Input. Renamed suspend() to yield(). Fixed a couple of bugs, and reorganized
 slightly some code.

---
 includes/Handle.h | 64 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 includes/Handle.h

(limited to 'includes/Handle.h')

diff --git a/includes/Handle.h b/includes/Handle.h
new file mode 100644
index 0000000..d2e1f8c
--- /dev/null
+++ b/includes/Handle.h
@@ -0,0 +1,64 @@
+#pragma once
+
+#include <Exceptions.h>
+
+namespace Balau {
+
+class EAgain : public GeneralException {
+  public:
+      EAgain() : GeneralException("Try Again") { }
+};
+
+class IO;
+
+class Handle {
+  public:
+      virtual ~Handle() { Assert(m_refCount == 0); }
+    virtual void close() throw (GeneralException) = 0;
+    virtual bool isClosed() = 0;
+    virtual bool canSeek();
+    virtual bool canRead();
+    virtual bool canWrite();
+    virtual const char * getName() = 0;
+    virtual ssize_t read(void * buf, size_t count) throw (GeneralException);
+    virtual ssize_t write(const void * buf, size_t count) throw (GeneralException);
+    virtual void rseek(off_t offset, int whence = SEEK_SET) throw (GeneralException);
+    virtual void wseek(off_t offset, int whence = SEEK_SET) throw (GeneralException);
+    virtual off_t rtell() throw (GeneralException);
+    virtual off_t wtell() throw (GeneralException);
+    virtual off_t getSize();
+  protected:
+      Handle() : m_refCount(0) { }
+  private:
+    void addRef() { m_refCount++; }
+    void delRef() { if (--m_refCount == 0) { if (!isClosed()) close(); delete this; } }
+    int refCount() { return m_refCount; }
+    friend class IO;
+
+    int m_refCount;
+};
+
+class IO {
+  public:
+      template<class T> IO(T * h) { setHandle(h); }
+      ~IO() { m_h->delRef(); }
+      IO(const IO & io) { setHandle(io.m_h); }
+    Handle * operator->() { return m_h; }
+  protected:
+    void setHandle(Handle * h) { m_h = h; m_h->addRef(); }
+  private:
+    Handle * m_h;
+};
+
+class SeekableHandle : public Handle {
+  public:
+    virtual bool canSeek();
+    virtual void rseek(off_t offset, int whence = SEEK_SET) throw (GeneralException);
+    virtual void wseek(off_t offset, int whence = SEEK_SET) throw (GeneralException);
+    virtual off_t rtell() throw (GeneralException);
+    virtual off_t wtell() throw (GeneralException);
+  private:
+    off_t m_wOffset, m_rOffset;
+};
+
+};
-- 
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