Core PPAPI proxy files. This includes the dispatcher which is the control point

on each end of the IPC channel. It includes the IPC message definitions. It
also includes the base class for the interface proxying, and the core resource
and var tracking.

BUG=none
TEST=none
Review URL: http://codereview.chromium.org/4229002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@64869 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 190 insertions, 0 deletions

diff --git a/ppapi/proxy/ppapi_param_traits.cc b/ppapi/proxy/ppapi_param_traits.cc
new file mode 100644
index 0000000..4bfe23c
--- /dev/null
+++ b/ppapi/proxy/ppapi_param_traits.cc
@@ -0,0 +1,190 @@
+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ppapi/proxy/ppapi_param_traits.h"
+
+#include <string.h>  // For memcpy
+
+#include "ppapi/proxy/serialized_var.h"
+
+namespace IPC {
+
+// static
+void ParamTraits<PP_InputEvent>::Write(Message* m, const param_type& p) {
+  // PP_InputEvent is just POD so we can just memcpy it.
+  m->WriteData(reinterpret_cast<const char*>(&p), sizeof(PP_InputEvent));
+}
+
+// static
+bool ParamTraits<PP_InputEvent>::Read(const Message* m,
+                                      void** iter,
+                                      param_type* r) {
+  const char* data;
+  int data_size;
+  if (!m->ReadData(iter, &data, &data_size))
+    return false;
+  memcpy(r, data, sizeof(PP_InputEvent));
+  return true;
+}
+
+// static
+void ParamTraits<PP_InputEvent>::Log(const param_type& p, std::string* l) {
+}
+
+// PP_ObjectProperty -----------------------------------------------------------
+
+// static
+void ParamTraits<PP_ObjectProperty>::Write(Message* m, const param_type& p) {
+  // FIXME(brettw);
+}
+
+// static
+bool ParamTraits<PP_ObjectProperty>::Read(const Message* m,
+                                          void** iter,
+                                          param_type* r) {
+  // FIXME(brettw);
+  return true;
+}
+
+// static
+void ParamTraits<PP_ObjectProperty>::Log(const param_type& p, std::string* l) {
+}
+
+// PP_Point --------------------------------------------------------------------
+
+// static
+void ParamTraits<PP_Point>::Write(Message* m, const param_type& p) {
+  m->WriteInt(p.x);
+  m->WriteInt(p.y);
+}
+
+// static
+bool ParamTraits<PP_Point>::Read(const Message* m, void** iter, param_type* r) {
+  return m->ReadInt(iter, &r->x) && !m->ReadInt(iter, &r->y);
+}
+
+// static
+void ParamTraits<PP_Point>::Log(const param_type& p, std::string* l) {
+}
+
+// PP_Rect ---------------------------------------------------------------------
+
+// static
+void ParamTraits<PP_Rect>::Write(Message* m, const param_type& p) {
+  m->WriteInt(p.point.x);
+  m->WriteInt(p.point.y);
+  m->WriteInt(p.size.width);
+  m->WriteInt(p.size.height);
+}
+
+// static
+bool ParamTraits<PP_Rect>::Read(const Message* m,
+                                void** iter,
+                                param_type* r) {
+  if (!m->ReadInt(iter, &r->point.x) ||
+      !m->ReadInt(iter, &r->point.y) ||
+      !m->ReadInt(iter, &r->size.width) ||
+      !m->ReadInt(iter, &r->size.height))
+    return false;
+  return true;
+}
+
+// static
+void ParamTraits<PP_Rect>::Log(const param_type& p, std::string* l) {
+}
+
+// PP_Size ---------------------------------------------------------------------
+
+// static
+void ParamTraits<PP_Size>::Write(Message* m, const param_type& p) {
+  m->WriteInt(p.width);
+  m->WriteInt(p.height);
+}
+
+// static
+bool ParamTraits<PP_Size>::Read(const Message* m, void** iter, param_type* r) {
+  return m->ReadInt(iter, &r->width) && m->ReadInt(iter, &r->height);
+}
+
+// static
+void ParamTraits<PP_Size>::Log(const param_type& p, std::string* l) {
+}
+
+// SerializedVar ---------------------------------------------------------------
+
+// static
+void ParamTraits<pp::proxy::SerializedVar>::Write(Message* m,
+                                                  const param_type& p) {
+  p.WriteToMessage(m);
+}
+
+// static
+bool ParamTraits<pp::proxy::SerializedVar>::Read(const Message* m,
+                                                 void** iter,
+                                                 param_type* r) {
+  return r->ReadFromMessage(m, iter);
+}
+
+// static
+void ParamTraits<pp::proxy::SerializedVar>::Log(const param_type& p,
+                                                std::string* l) {
+}
+
+// std::vector<SerializedVar> --------------------------------------------------
+
+void ParamTraits< std::vector<pp::proxy::SerializedVar> >::Write(
+    Message* m,
+    const param_type& p) {
+  WriteParam(m, static_cast<int>(p.size()));
+  for (size_t i = 0; i < p.size(); i++)
+    WriteParam(m, p[i]);
+}
+
+// static
+bool ParamTraits< std::vector<pp::proxy::SerializedVar> >::Read(
+    const Message* m,
+    void** iter,
+    param_type* r) {
+  // This part is just a copy of the the default ParamTraits vector Read().
+  int size;
+  // ReadLength() checks for < 0 itself.
+  if (!m->ReadLength(iter, &size))
+    return false;
+  // Resizing beforehand is not safe, see BUG 1006367 for details.
+  if (INT_MAX / sizeof(pp::proxy::SerializedVar) <= static_cast<size_t>(size))
+    return false;
+
+  // The default vector deserializer does resize here and then we deserialize
+  // into those allocated slots. However, the implementation of vector (at
+  // least in GCC's implementation), creates a new empty object using the
+  // default constructor, and then sets the rest of the items to that empty
+  // one using the copy constructor.
+  //
+  // Since we allocate the inner class when you call the default constructor
+  // and transfer the inner class when you do operator=, the entire vector
+  // will end up referring to the same inner class. Deserializing into this
+  // will just end up overwriting the same item over and over, since all the
+  // SerializedVars will refer to the same thing.
+  //
+  // The solution is to make a new SerializedVar for each deserialized item,
+  // and then add it to the vector one at a time. Our copies are efficient so
+  // this is no big deal.
+  r->reserve(size);
+  for (int i = 0; i < size; i++) {
+    pp::proxy::SerializedVar var;
+    if (!ReadParam(m, iter, &var))
+      return false;
+    r->push_back(var);
+  }
+  return true;
+}
+
+// static
+void ParamTraits< std::vector<pp::proxy::SerializedVar> >::Log(
+    const param_type& p,
+    std::string* l) {
+}
+
+
+}  // namespace IPC