Cloning a bunch of stuff from the native_client repository at r6528

ppapi/native_client/src/shared/ppapi_proxy/plugin_ppb_file_ref.cc

+// Copyright (c) 2011 The Native Client 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 "native_client/src/shared/ppapi_proxy/plugin_ppb_file_ref.h"
+
+#include <string.h>
+#include <cmath>
+#include <string>
+
+#include "native_client/src/include/nacl_scoped_ptr.h"
+#include "native_client/src/include/portability.h"
+#include "native_client/src/shared/ppapi_proxy/object_serialize.h"
+#include "native_client/src/shared/ppapi_proxy/plugin_callback.h"
+#include "native_client/src/shared/ppapi_proxy/plugin_globals.h"
+#include "native_client/src/shared/ppapi_proxy/utility.h"
+#include "ppapi/c/pp_completion_callback.h"
+#include "ppapi/c/pp_errors.h"
+#include "srpcgen/ppb_rpc.h"
+
+namespace ppapi_proxy {
+
+namespace {
+bool IsDirectoryTraversal(const std::string& path) {
+  bool is_directory_traversal = true;
+  // TODO(sanga): Do we need to guard against percent encoded strings as well?
+  if (path.find("../") == std::string::npos)
+    is_directory_traversal = false;
+  return is_directory_traversal;
+}
+
+PP_Resource Create(PP_Resource file_system,
+                   const char* path) {
+  DebugPrintf("PPB_FileRef::Create: file_system=%"NACL_PRIu32", path=%s\n",
+              file_system, path);
+
+  PP_Resource resource = kInvalidResourceId;
+
+  if (IsDirectoryTraversal(path))
+    return kInvalidResourceId;
+
+  NaClSrpcError srpc_result = PpbFileRefRpcClient::PPB_FileRef_Create(
+      GetMainSrpcChannel(),
+      file_system,
+      strlen(path) + 1,  // Add 1 to preserve terminating '\0'
+      const_cast<char*>(path),
+      &resource);
+  DebugPrintf("PPB_FileRef::Create: %s\n", NaClSrpcErrorString(srpc_result));
+
+  if (srpc_result == NACL_SRPC_RESULT_OK)
+    return resource;
+  return kInvalidResourceId;
+}
+
+PP_Bool IsFileRef(PP_Resource file_ref) {
+  DebugPrintf("PPB_FileRef::IsFileRef: file_ref=%"NACL_PRIu32"\n", file_ref);
+
+  int32_t is_file_ref = 0;
+  NaClSrpcError srpc_result = PpbFileRefRpcClient::PPB_FileRef_IsFileRef(
+      GetMainSrpcChannel(),
+      file_ref,
+      &is_file_ref);
+  DebugPrintf("PPB_FileRef::IsFileRef: %s\n", NaClSrpcErrorString(srpc_result));
+
+  if ((srpc_result == NACL_SRPC_RESULT_OK) && is_file_ref)
+    return PP_TRUE;
+  return PP_FALSE;
+}
+
+PP_FileSystemType GetFileSystemType(PP_Resource file_ref) {
+  DebugPrintf("PPB_FileRef::GetFileSystemType: file_ref=%"NACL_PRIu32"\n",
+              file_ref);
+
+  int32_t file_system_type = PP_FILESYSTEMTYPE_INVALID;
+  NaClSrpcError srpc_result =
+      PpbFileRefRpcClient::PPB_FileRef_GetFileSystemType(
+          GetMainSrpcChannel(),
+          file_ref,
+          &file_system_type);
+  DebugPrintf("PPB_FileRef::GetFileSystemType: %s\n",
+              NaClSrpcErrorString(srpc_result));
+
+  if (srpc_result == NACL_SRPC_RESULT_OK)
+    return static_cast<PP_FileSystemType>(file_system_type);
+  return PP_FILESYSTEMTYPE_INVALID;
+}
+
+PP_Var GetName(PP_Resource file_ref) {
+  DebugPrintf("PPB_FileRef::GetName: file_ref=%"NACL_PRIu32"\n", file_ref);
+
+  PP_Var name = PP_MakeUndefined();
+  nacl_abi_size_t length = kMaxVarSize;
+  nacl::scoped_array<char> name_bytes(new char[length]);
+  NaClSrpcError srpc_result = PpbFileRefRpcClient::PPB_FileRef_GetName(
+      GetMainSrpcChannel(),
+      file_ref,
+      &length,
+      name_bytes.get());
+  DebugPrintf("PPB_FileRef::GetName: %s\n", NaClSrpcErrorString(srpc_result));
+
+  if (srpc_result == NACL_SRPC_RESULT_OK) {
+    if (DeserializeTo(GetMainSrpcChannel(), name_bytes.get(), length,
+                      1,  // argc
+                      &name))
+      return name;
+  }
+  return PP_MakeUndefined();
+}
+
+PP_Var GetPath(PP_Resource file_ref) {
+  DebugPrintf("PPB_FileRef::GetPath: file_ref=%"NACL_PRIu32"\n", file_ref);
+
+  PP_Var path = PP_MakeUndefined();
+  nacl_abi_size_t length = kMaxVarSize;
+  nacl::scoped_array<char> path_bytes(new char[length]);
+  NaClSrpcError srpc_result = PpbFileRefRpcClient::PPB_FileRef_GetPath(
+      GetMainSrpcChannel(),
+      file_ref,
+      &length,
+      path_bytes.get());
+  DebugPrintf("PPB_FileRef::GetPath: %s\n",
+              NaClSrpcErrorString(srpc_result));
+
+  if (srpc_result == NACL_SRPC_RESULT_OK &&
+    DeserializeTo(GetMainSrpcChannel(), path_bytes.get(), length,
+                  1,  // argc
+                  &path)) {
+      return path;
+  }
+  return PP_MakeUndefined();
+}
+
+PP_Resource GetParent(PP_Resource file_ref) {
+  DebugPrintf("PPB_FileRef::GetParent: file_ref=%"NACL_PRIu32"\n", file_ref);
+
+  PP_Resource parent = kInvalidResourceId;
+  NaClSrpcError srpc_result = PpbFileRefRpcClient::PPB_FileRef_GetParent(
+      GetMainSrpcChannel(),
+      file_ref,
+      &parent);
+  DebugPrintf("PPB_FileRef::GetParent: %s\n",
+              NaClSrpcErrorString(srpc_result));
+
+  if (srpc_result == NACL_SRPC_RESULT_OK)
+    return parent;
+  return kInvalidResourceId;
+}
+
+int32_t MakeDirectory(PP_Resource directory_ref,
+                      PP_Bool make_ancestors,
+                      struct PP_CompletionCallback callback) {
+  DebugPrintf("PPB_FileRef::MakeDirectory: directory_ref=%"NACL_PRIu32", "
+              "make_ancestors=%s\n", directory_ref,
+              (make_ancestors ? "true" : "false"));
+
+  int32_t callback_id = CompletionCallbackTable::Get()->AddCallback(callback);
+  int32_t pp_error = PP_ERROR_FAILED;
+  NaClSrpcError srpc_result = PpbFileRefRpcClient::PPB_FileRef_MakeDirectory(
+      GetMainSrpcChannel(),
+      directory_ref,
+      make_ancestors,
+      callback_id,
+      &pp_error);
+  DebugPrintf("PPB_FileRef::MakeDirectory: %s\n",
+              NaClSrpcErrorString(srpc_result));
+
+  if (srpc_result == NACL_SRPC_RESULT_OK)
+    return MayForceCallback(callback, pp_error);
+  return PP_ERROR_FAILED;
+}
+
+int32_t Touch(PP_Resource file_ref,
+              PP_Time last_access_time,
+              PP_Time last_modified_time,
+              struct PP_CompletionCallback callback) {
+  DebugPrintf("PPB_FileRef::Touch: file_ref=%"NACL_PRIu32", "
+              "last_access_time=%lf, last_modified_time=%lf\n",
+              file_ref, last_access_time, last_modified_time);
+
+  if (std::isnan(last_access_time) ||
+      std::isnan(last_modified_time)) {
+    return PP_ERROR_FAILED;
+  }
+
+  int32_t callback_id = CompletionCallbackTable::Get()->AddCallback(callback);
+  int32_t pp_error = PP_ERROR_FAILED;
+  NaClSrpcError srpc_result = PpbFileRefRpcClient::PPB_FileRef_Touch(
+      GetMainSrpcChannel(),
+      file_ref,
+      last_access_time,
+      last_modified_time,
+      callback_id,
+      &pp_error);
+  DebugPrintf("PPB_FileRef::Touch: %s\n", NaClSrpcErrorString(srpc_result));
+
+  if (srpc_result == NACL_SRPC_RESULT_OK)
+    return MayForceCallback(callback, pp_error);
+  return PP_ERROR_FAILED;
+}
+
+int32_t Delete(PP_Resource file_ref,
+               struct PP_CompletionCallback callback) {
+  DebugPrintf("PPB_FileRef::Delete: file_ref=%"NACL_PRIu32"\n", file_ref);
+
+  int32_t callback_id = CompletionCallbackTable::Get()->AddCallback(callback);
+  int32_t pp_error = PP_ERROR_FAILED;
+  NaClSrpcError srpc_result = PpbFileRefRpcClient::PPB_FileRef_Delete(
+      GetMainSrpcChannel(),
+      file_ref,
+      callback_id,
+      &pp_error);
+  DebugPrintf("PPB_FileRef::Delete: %s\n", NaClSrpcErrorString(srpc_result));
+
+  if (srpc_result == NACL_SRPC_RESULT_OK)
+    return MayForceCallback(callback, pp_error);
+  return PP_ERROR_FAILED;
+}
+
+int32_t Rename(PP_Resource file_ref,
+               PP_Resource new_file_ref,
+               struct PP_CompletionCallback callback) {
+  DebugPrintf("PPB_FileRef::Rename: file_ref=%"NACL_PRIu32", "
+              "new_file_ref=%"NACL_PRIu32"\n", file_ref, new_file_ref);
+
+  int32_t callback_id = CompletionCallbackTable::Get()->AddCallback(callback);
+  int32_t pp_error = PP_ERROR_FAILED;
+  NaClSrpcError srpc_result = PpbFileRefRpcClient::PPB_FileRef_Rename(
+      GetMainSrpcChannel(),
+      file_ref,
+      new_file_ref,
+      callback_id,
+      &pp_error);
+  DebugPrintf("PPB_FileRef::Rename: %s\n", NaClSrpcErrorString(srpc_result));
+
+  if (srpc_result == NACL_SRPC_RESULT_OK)
+    return MayForceCallback(callback, pp_error);
+  return PP_ERROR_FAILED;
+}
+}  // namespace
+
+const PPB_FileRef* PluginFileRef::GetInterface() {
+  static const PPB_FileRef file_ref_interface = {
+    Create,
+    IsFileRef,
+    GetFileSystemType,
+    GetName,
+    GetPath,
+    GetParent,
+    MakeDirectory,
+    Touch,
+    Delete,
+    Rename
+  };
+  return &file_ref_interface;
+}
+}  // namespace ppapi_proxy