Refactored OpenGL embedder that works on Android, Mac or Linux.

runtime/embedders/openglui/emulator/emulator_resource.h

Index: runtime/embedders/openglui/emulator/emulator_resource.h
===================================================================
--- runtime/embedders/openglui/emulator/emulator_resource.h	(revision 0)
+++ runtime/embedders/openglui/emulator/emulator_resource.h	(revision 0)
@@ -0,0 +1,63 @@
+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+#ifndef EMBEDDERS_OPENGLUI_EMULATOR_EMULATOR_RESOURCE_H_
+#define EMBEDDERS_OPENGLUI_EMULATOR_EMULATOR_RESOURCE_H_
+
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include "embedders/openglui/common/log.h"
+#include "embedders/openglui/common/resource.h"
+
+class EmulatorResource : public Resource {
+  public:
+    explicit EmulatorResource(const char* path)
+      : base(path),
+        fd_(-1) {
+    }
+
+    int32_t descriptor() {
+      if (fd_ < 0) {
+        Open();
+      }
+      return fd_;
+    }
+
+    off_t length() {
+      if (length_ < 0) {
+        length_ = lseek(fd), 0, SEEK_END);
+        lseek(fd), 0, SEEK_START);
+      }
+      return length_;
+    }
+
+    int32_t Open() {
+      fd_ = open(path_, 0);
+      if (fd_ >= 0) {
+        return 0;
+      }
+      LOGE("Could not open asset %s", path_);
+      return -1;
+    }
+
+    void Close() {
+      if (fd_ >= 0) {
+        close(fd_);
+        fd_ = -1;
+      }
+    }
+
+    int32_t Read(void* buffer, size_t count) {
+      size_t actual = read(asset_, buffer, count);
+      return (actual == count) ? 0 : -1;
+    }
+
+  private:
+    int fd_;
+};
+
+#endif  // EMBEDDERS_OPENGLUI_EMULATOR_EMULATOR_RESOURCE_H_
+