ppapi/shared_impl/array_var.cc

   1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ppapi/shared_impl/array_var.h"
   6
   7 #include <limits>
   8
   9 #include "base/logging.h"
  10 #include "base/memory/ref_counted.h"
  11 #include "ppapi/shared_impl/ppapi_globals.h"
  12 #include "ppapi/shared_impl/var_tracker.h"
  13
  14 namespace ppapi {
  15
  16 ArrayVar::ArrayVar() {}
  17
  18 ArrayVar::~ArrayVar() {}
  19
  20 // static
  21 ArrayVar* ArrayVar::FromPPVar(const PP_Var& var) {
  22   if (var.type != PP_VARTYPE_ARRAY)
  23     return NULL;
  24
  25   scoped_refptr<Var> var_object(
  26       PpapiGlobals::Get()->GetVarTracker()->GetVar(var));
  27   if (!var_object.get())
  28     return NULL;
  29   return var_object->AsArrayVar();
  30 }
  31
  32 ArrayVar* ArrayVar::AsArrayVar() { return this; }
  33
  34 PP_VarType ArrayVar::GetType() const { return PP_VARTYPE_ARRAY; }
  35
  36 PP_Var ArrayVar::Get(uint32_t index) const {
  37   if (index >= elements_.size())
  38     return PP_MakeUndefined();
  39
  40   const PP_Var& element = elements_[index].get();
  41   if (PpapiGlobals::Get()->GetVarTracker()->AddRefVar(element))
  42     return element;
  43   else
  44     return PP_MakeUndefined();
  45 }
  46
  47 PP_Bool ArrayVar::Set(uint32_t index, const PP_Var& value) {
  48   if (index == std::numeric_limits<uint32_t>::max())
  49     return PP_FALSE;
  50
  51   if (index >= elements_.size()) {
  52     // Insert ScopedPPVars of type PP_VARTYPE_UNDEFINED to reach the new size
  53     // (index + 1).
  54     elements_.resize(index + 1);
  55   }
  56
  57   elements_[index] = value;
  58   return PP_TRUE;
  59 }
  60
  61 uint32_t ArrayVar::GetLength() const {
  62   if (elements_.size() > std::numeric_limits<uint32_t>::max()) {
  63     CHECK(false);
  64     return 0;
  65   }
  66
  67   return static_cast<uint32_t>(elements_.size());
  68 }
  69
  70 PP_Bool ArrayVar::SetLength(uint32_t length) {
  71   // If |length| is larger than the current size, ScopedPPVars of type
  72   // PP_VARTYPE_UNDEFINED will be inserted to reach the new length.
  73   elements_.resize(length);
  74   return PP_TRUE;
  75 }
  76
  77 }  // namespace ppapi