1 files changed, 92 insertions, 0 deletions
diff --git a/sandbox/src/shared_handles.cc b/sandbox/src/shared_handles.cc
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+++ b/sandbox/src/shared_handles.cc
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+// Copyright 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "sandbox/src/shared_handles.h"
+
+namespace sandbox {
+
+// Note once again the the assumption here is that the shared memory is
+// initialized with zeros in the process that calls SetHandle and that
+// the process that calls GetHandle 'sees' this memory.
+
+SharedHandles::SharedHandles() {
+  shared_.items = NULL;
+  shared_.max_items = 0;
+}
+
+bool SharedHandles::Init(void* raw_mem, size_t size_bytes) {
+  if (size_bytes < sizeof(shared_.items[0])) {
+    // The shared memory is too small!
+    return false;
+  }
+  shared_.items = static_cast<SharedItem*>(raw_mem);
+  shared_.max_items = size_bytes / sizeof(shared_.items[0]);
+  return true;
+}
+
+// Note that an empty slot is marked with a tag == 0 that is why is
+// not a valid imput tag
+bool SharedHandles::SetHandle(uint32 tag, HANDLE handle) {
+  if (0 == tag) {
+    // Invalid tag
+    return false;
+  }
+  // Find empty slot and put the tag and the handle there
+  SharedItem* empty_slot = FindByTag(0);
+  if (NULL == empty_slot) {
+    return false;
+  }
+  empty_slot->tag = tag;
+  empty_slot->item = handle;
+  return true;
+}
+
+bool SharedHandles::GetHandle(uint32 tag, HANDLE* handle) {
+  if (0 == tag) {
+    // Invalid tag
+    return false;
+  }
+  SharedItem* found = FindByTag(tag);
+  if (NULL == found) {
+    return false;
+  }
+  *handle = found->item;
+  return true;
+}
+
+SharedHandles::SharedItem* SharedHandles::FindByTag(uint32 tag) {
+  for (size_t ix = 0; ix != shared_.max_items; ++ix) {
+    if (tag == shared_.items[ix].tag) {
+      return &shared_.items[ix];
+    }
+  }
+  return NULL;
+}
+
+}  // namespace sandbox