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.

---
 src/Handle.cc | 151 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 151 insertions(+)
 create mode 100644 src/Handle.cc

(limited to 'src/Handle.cc')

diff --git a/src/Handle.cc b/src/Handle.cc
new file mode 100644
index 0000000..c9e3f57
--- /dev/null
+++ b/src/Handle.cc
@@ -0,0 +1,151 @@
+#include <typeinfo>
+#include "ev++.h"
+#include "eio.h"
+#include "Main.h"
+#include "TaskMan.h"
+#include "Handle.h"
+
+class eioInterface : public Balau::AtStart {
+  public:
+      eioInterface() : AtStart(100) { }
+    void repeatCB(ev::idle & w, int revents);
+    void readyCB(ev::async & w, int revents);
+    static void wantPoll();
+    virtual void doStart();
+    ev::idle m_repeat;
+    ev::async m_ready;
+};
+
+static eioInterface eioIF;
+
+void eioInterface::repeatCB(ev::idle & w, int revents) {
+    if (eio_poll() != -1)
+        w.stop();
+}
+
+void eioInterface::readyCB(ev::async & w, int revents) {
+    if (eio_poll() == -1)
+        m_repeat.start();
+}
+
+void eioInterface::doStart() {
+    Balau::TaskMan * taskMan = Balau::TaskMan::getTaskMan();
+    Assert(taskMan);
+    struct ev_loop * loop = taskMan->getLoop();
+
+    m_repeat.set(loop);
+    m_repeat.set<eioInterface, &eioInterface::repeatCB>(this);
+
+    m_ready.set(loop);
+    m_ready.set<eioInterface, &eioInterface::readyCB>(this);
+    m_ready.start();
+
+    eio_init(wantPoll, NULL);
+}
+
+void eioInterface::wantPoll() {
+    eioIF.m_ready.send();
+}
+
+bool Balau::Handle::canSeek() { return false; }
+bool Balau::Handle::canRead() { return false; }
+bool Balau::Handle::canWrite() { return false; }
+off_t Balau::Handle::getSize() { return -1; }
+
+ssize_t Balau::Handle::read(void * buf, size_t count) throw (GeneralException) {
+    if (canRead())
+        throw GeneralException(String("Handle ") + getName() + " can read, but read() not implemented (missing in class " + typeid(*this).name() + ")");
+    else
+        throw GeneralException("Handle can't read");
+    return -1;
+}
+
+ssize_t Balau::Handle::write(const void * buf, size_t count) throw (GeneralException) {
+    if (canWrite())
+        throw GeneralException(String("Handle ") + getName() + " can write, but write() not implemented (missing in class " + typeid(this).name() + ")");
+    else
+        throw GeneralException("Handle can't write");
+    return -1;
+}
+
+void Balau::Handle::rseek(off_t offset, int whence) throw (GeneralException) {
+    if (canSeek())
+        throw GeneralException(String("Handle ") + getName() + " can seek, but rseek() not implemented (missing in class " + typeid(this).name() + ")");
+    else
+        throw GeneralException("Handle can't seek");
+}
+
+void Balau::Handle::wseek(off_t offset, int whence) throw (GeneralException) {
+    rseek(offset, whence);
+}
+
+off_t Balau::Handle::rtell() throw (GeneralException) {
+    if (canSeek())
+        throw GeneralException(String("Handle ") + getName() + " can seek, but rtell() not implemented (missing in class " + typeid(this).name() + ")");
+    else
+        throw GeneralException("Handle can't seek");
+}
+
+off_t Balau::Handle::wtell() throw (GeneralException) {
+    return rtell();
+}
+
+bool Balau::SeekableHandle::canSeek() { return true; }
+
+void Balau::SeekableHandle::rseek(off_t offset, int whence) throw (GeneralException) {
+    Assert(canRead() || canWrite());
+    off_t size;
+    if (!canRead())
+        wseek(offset, whence);
+    switch (whence) {
+    case SEEK_SET:
+        m_rOffset = offset;
+        break;
+    case SEEK_CUR:
+        m_rOffset += offset;
+        break;
+    case SEEK_END:
+        size = getSize();
+        if (getSize() < 0)
+            throw GeneralException("Can't seek from end in a Handle you don't know the max size");
+        m_rOffset = size + offset;
+        break;
+    }
+    if (m_rOffset < 0)
+        m_rOffset = 0;
+}
+
+void Balau::SeekableHandle::wseek(off_t offset, int whence) throw (GeneralException) {
+    Assert(canRead() || canWrite());
+    off_t size;
+    if (!canWrite())
+        rseek(offset, whence);
+    switch (whence) {
+    case SEEK_SET:
+        m_wOffset = offset;
+        break;
+    case SEEK_CUR:
+        m_wOffset += offset;
+        break;
+    case SEEK_END:
+        size = getSize();
+        if (getSize() < 0)
+            throw GeneralException("Can't seek from end in a Handle you don't know the max size");
+        m_wOffset = size + offset;
+        break;
+    }
+    if (m_wOffset < 0)
+        m_wOffset = 0;
+}
+
+off_t Balau::SeekableHandle::rtell() throw (GeneralException) {
+    Assert(canRead() || canWrite());
+    if (!canRead())
+        return wtell();
+}
+
+off_t Balau::SeekableHandle::wtell() throw (GeneralException) {
+    Assert(canRead() || canWrite());
+    if (!canWrite())
+        return rtell();
+}
-- 
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