Add PPAPI decryptor implementation.

ppapi/cpp/private/content_decryptor_private.cc

+// Copyright (c) 2012 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/cpp/private/content_decryptor_private.h"
+
+#include <cstring>  // memcpy
+
+#include "ppapi/c/ppb_var.h"
+#include "ppapi/c/private/ppb_content_decryptor_private.h"
+#include "ppapi/c/private/ppp_content_decryptor_private.h"
+#include "ppapi/cpp/instance.h"
+#include "ppapi/cpp/instance_handle.h"
+#include "ppapi/cpp/module.h"
+#include "ppapi/cpp/module_impl.h"
+#include "ppapi/cpp/var.h"
+
+namespace pp {
+
+namespace {
+
+static const char kPPPContentDecryptorInterface[] =
+    PPP_CONTENTDECRYPTOR_PRIVATE_INTERFACE;
+
+PP_Bool GenerateKeyRequest(PP_Instance instance,
+                           PP_Var key_system_arg,
+                           PP_Var init_data_arg) {
+  void* object =
+      Instance::GetPerInstanceObject(instance, kPPPContentDecryptorInterface);
+  if (!object)
+    return PP_FALSE;
+
+  pp::Var key_system_var(pp::PASS_REF, key_system_arg);
+  if (key_system_var.is_string() == false)
+    return PP_FALSE;
+
+  pp::Var init_data_var(pp::PASS_REF, init_data_arg);
+  if (init_data_var.is_array_buffer() == false)
+    return PP_FALSE;
+  pp::VarArrayBuffer init_data_array_buffer(init_data_var);
+
+  return PP_FromBool(
+      static_cast<ContentDecryptor_Private*>(object)->GenerateKeyRequest(
+          key_system_var.AsString(),
+          init_data_array_buffer));
+}
+
+PP_Bool AddKey(PP_Instance instance,
+               PP_Var session_id_arg,
+               PP_Var key_arg) {
+  void* object =
+      Instance::GetPerInstanceObject(instance, kPPPContentDecryptorInterface);
+  if (!object)
+    return PP_FALSE;
+
+  pp::Var session_id_var(pp::PASS_REF, session_id_arg);
+  if (session_id_var.is_string() == false)
+    return PP_FALSE;
+
+  pp::Var key_var(pp::PASS_REF, key_arg);
+  if (key_var.is_array_buffer() == false)
+    return PP_FALSE;
+  pp::VarArrayBuffer key(key_var);
+
+  return PP_FromBool(
+      static_cast<ContentDecryptor_Private*>(object)->AddKey(
+          session_id_var.AsString(),
+          key));
+}
+
+PP_Bool CancelKeyRequest(PP_Instance instance,
+                         PP_Var session_id_arg) {
+  void* object =
+      Instance::GetPerInstanceObject(instance, kPPPContentDecryptorInterface);
+  if (!object)
+    return PP_FALSE;
+
+  pp::Var session_id_var(pp::PASS_REF, session_id_arg);
+    if (session_id_var.is_string() == false)
+      return PP_FALSE;
+
+  return PP_FromBool(
+      static_cast<ContentDecryptor_Private*>(object)->
+          CancelKeyRequest(session_id_var.AsString()));
+}
+
+
+PP_Bool Decrypt(PP_Instance instance,
+                PP_Resource encrypted_resource,
+                int32_t request_id) {
+  void* object =
+      Instance::GetPerInstanceObject(instance, kPPPContentDecryptorInterface);
+  if (!object)
+    return PP_FALSE;
+
+  pp::Buffer_Dev encrypted_block(encrypted_resource);
+
+  return PP_FromBool(
+      static_cast<ContentDecryptor_Private*>(object)->Decrypt(encrypted_block,
+                                                              request_id));
+}
+
+PP_Bool DecryptAndDecode(PP_Instance instance,
+                         PP_Resource encrypted_resource,
+                         int32_t request_id) {
+  void* object =
+      Instance::GetPerInstanceObject(instance, kPPPContentDecryptorInterface);
+  if (!object)
+    return PP_FALSE;
+
+  pp::Buffer_Dev encrypted_block(encrypted_resource);
+
+  return PP_FromBool(
+      static_cast<ContentDecryptor_Private*>(object)->DecryptAndDecode(
+          encrypted_block,
+          request_id));
+}
+
+const PPP_ContentDecryptor_Private ppp_content_decryptor = {
+  &GenerateKeyRequest,
+  &AddKey,
+  &CancelKeyRequest,
+  &Decrypt,
+  &DecryptAndDecode
+};
+
+template <> const char* interface_name<PPB_ContentDecryptor_Private>() {
+  return PPB_CONTENTDECRYPTOR_PRIVATE_INTERFACE;
+}
+
+}  // namespace
+
+ContentDecryptor_Private::ContentDecryptor_Private(Instance* instance)
+    : associated_instance_(instance) {
+  Module::Get()->AddPluginInterface(kPPPContentDecryptorInterface,
+                                    &ppp_content_decryptor);
+  instance->AddPerInstanceObject(kPPPContentDecryptorInterface, this);
+}
+
+ContentDecryptor_Private::~ContentDecryptor_Private() {
+  Instance::RemovePerInstanceObject(associated_instance_,
+                                    kPPPContentDecryptorInterface,
+                                    this);
+}
+
+void ContentDecryptor_Private::NeedKey(const std::string& key_system,
+                                       const std::string& session_id,
+                                       const std::string& init_data) {

[dmichael (off chromium), 2012/08/15 17:44:37]

Why use string here if the underlying type is ArrayBuffer? You're forcing an
unnecessary memcpy below.

[Tom Finegan, 2012/08/16 03:10:48]

Done/changed to VarArrayBuffer.

+  // session_id can be empty here.
+  if (has_interface<PPB_ContentDecryptor_Private>()) {
+    pp::Var key_system_var(key_system);
+    pp::Var session_id_var(session_id);
+    pp::VarArrayBuffer init_data_array_buffer(init_data.size());
+    memcpy(init_data_array_buffer.Map(), init_data.data(), init_data.size());
+
+    // TODO(tomfinegan): Unmap init_data_array_buffer, or leave it Map'd and
+    // assume it is already mapped inside the plugin?
+
+    get_interface<PPB_ContentDecryptor_Private>()->NeedKey(
+        associated_instance_.pp_instance(),
+        key_system_var.pp_var(),
+        session_id_var.pp_var(),
+        init_data_array_buffer.pp_var());
+  }
+}
+
+void ContentDecryptor_Private::KeyAdded(const std::string& key_system,
+                                        const std::string& session_id) {
+  if (has_interface<PPB_ContentDecryptor_Private>()) {
+    pp::Var key_system_var(key_system);
+    pp::Var session_id_var(session_id);
+    get_interface<PPB_ContentDecryptor_Private>()->KeyAdded(
+        associated_instance_.pp_instance(),
+        key_system_var.pp_var(),
+        session_id_var.pp_var());
+  }
+}
+
+void ContentDecryptor_Private::KeyMessage(const std::string& key_system,
+                                          const std::string& session_id,
+                                          pp::Buffer_Dev message,
+                                          const std::string& default_url) {
+  if (has_interface<PPB_ContentDecryptor_Private>()) {
+    pp::Var key_system_var(key_system);
+    pp::Var session_id_var(session_id);
+    pp::Var default_url_var(default_url);
+    get_interface<PPB_ContentDecryptor_Private>()->KeyMessage(
+        associated_instance_.pp_instance(),
+        key_system_var.pp_var(),
+        session_id_var.pp_var(),
+        message.pp_resource(),
+        default_url_var.pp_var());
+  }
+}
+
+void ContentDecryptor_Private::KeyError(const std::string& key_system,
+                                        const std::string& session_id,
+                                        int32_t media_error,
+                                        int32_t system_code) {
+  if (has_interface<PPB_ContentDecryptor_Private>()) {
+    pp::Var key_system_var(key_system);
+    pp::Var session_id_var(session_id);
+    get_interface<PPB_ContentDecryptor_Private>()->KeyError(
+        associated_instance_.pp_instance(),
+        key_system_var.pp_var(),
+        session_id_var.pp_var(),
+        media_error,
+        system_code);
+  }
+}
+
+void ContentDecryptor_Private::DeliverBlock(pp::Buffer_Dev decrypted_block,
+                                            int32_t request_id) {
+  if (has_interface<PPB_ContentDecryptor_Private>()) {
+    get_interface<PPB_ContentDecryptor_Private>()->DeliverBlock(
+        associated_instance_.pp_instance(),
+        decrypted_block.pp_resource(),
+        request_id);
+  }
+}
+
+void ContentDecryptor_Private::DeliverFrame(pp::Buffer_Dev decrypted_frame,
+                                            int32_t request_id) {
+  if (has_interface<PPB_ContentDecryptor_Private>()) {
+    get_interface<PPB_ContentDecryptor_Private>()->DeliverFrame(
+        associated_instance_.pp_instance(),
+        decrypted_frame.pp_resource(),
+        request_id);
+  }
+}
+
+void ContentDecryptor_Private::DeliverSamples(pp::Buffer_Dev decrypted_samples,
+                                              int32_t request_id) {
+  if (has_interface<PPB_ContentDecryptor_Private>()) {
+    get_interface<PPB_ContentDecryptor_Private>()->DeliverSamples(
+        associated_instance_.pp_instance(),
+        decrypted_samples.pp_resource(),
+        request_id);
+  }
+}
+
+}  // namespace pp