Start implementation.

src/Handle.h

@@ -0,0 +1,107 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) FIRST 2016. All Rights Reserved.                             */
+/* Open Source Software - may be modified and shared by FRC teams. The code   */
+/* must be accompanied by the FIRST BSD license file in the root directory of */
+/* the project.                                                               */
+/*----------------------------------------------------------------------------*/
+
+#ifndef CAMERASERVER_HANDLE_H_
+#define CAMERASERVER_HANDLE_H_
+
+#include <atomic>
+
+#include "llvm/StringRef.h"
+
+#include "cameraserver_c.h"
+#include "UnlimitedHandleResource.h"
+
+namespace cs {
+
+class SinkImpl;
+class SourceImpl;
+
+// Handle data layout:
+// Bits 0-15:  Handle index
+// Bits 16-23: Subindex (property only)
+// Bits 24-30: Type
+
+class Handle {
+ public:
+  enum Type {
+    kUndefined = 0,
+    kProperty = 0x40,
+    kSource,
+    kSink,
+    kListener
+  };
+  enum { kIndexMax = 0xffff };
+
+  Handle(CS_Handle handle) : m_handle(handle) {}
+  operator CS_Handle() const { return m_handle; }
+
+  Handle(int index, Type type) {
+    if (index < 0) {
+      m_handle = 0;
+      return;
+    }
+    m_handle = ((static_cast<int>(type) & 0x7f) << 24) | (index & 0xffff);
+  }
+  Handle(int index, int property, Type type) {
+    if (index < 0 || property < 0) {
+      m_handle = 0;
+      return;
+    }
+    m_handle = ((static_cast<int>(type) & 0x7f) << 24) |
+               ((property & 0xff) << 16) | (index & 0xffff);
+  }
+
+  int GetIndex() const { return static_cast<int>(m_handle) & 0xffff; }
+  Type GetType() const {
+    return static_cast<Type>((static_cast<int>(m_handle) >> 24) & 0xff);
+  }
+  bool IsType(Type type) const { return type == GetType(); }
+  int GetTypedIndex(Type type) const { return IsType(type) ? GetIndex() : -1; }
+  int GetSubIndex() const { return (static_cast<int>(m_handle) >> 16) & 0xff; }
+
+ private:
+  CS_Handle m_handle;
+};
+
+struct SourceData {
+  enum Type {
+    kUnknown = 0,
+    kUSB,
+    kHTTP,
+    kCv
+  };
+  SourceData(Type type_, std::shared_ptr<SourceImpl> source_)
+      : type{type_}, refCount{0}, source{source_} {}
+
+  Type type;
+  std::atomic_int refCount;
+  std::shared_ptr<SourceImpl> source;
+};
+
+typedef StaticUnlimitedHandleResource<Handle, SourceData, Handle::kSource>
+    Sources;
+
+struct SinkData {
+  enum Type {
+    kUnknown = 0,
+    kHTTP,
+    kCv
+  };
+  explicit SinkData(Type type_, std::shared_ptr<SinkImpl> sink_)
+      : type{type_}, refCount{0}, sourceHandle{0}, sink{sink_} {}
+
+  Type type;
+  std::atomic_int refCount;
+  std::atomic<CS_Source> sourceHandle;
+  std::shared_ptr<SinkImpl> sink;
+};
+
+typedef StaticUnlimitedHandleResource<Handle, SinkData, Handle::kSink> Sinks;
+
+}  // namespace cs
+
+#endif  // CAMERASERVER_HANDLE_H_