root/ppapi/shared_impl/var.cc

DEFINITIONS

1. PPVarToLogString
2. AsStringVar
3. AsArrayBufferVar
4. AsNPObjectVar
5. AsProxyObjectVar
6. AsArrayVar
7. AsDictionaryVar
8. AsResourceVar
9. GetPPVar
10. GetExistingVarID
11. GetOrCreateVarID
12. AssignVarID
13. AsStringVar
14. GetType
15. StringToPPVar
16. StringToPPVar
17. FromPPVar
18. SwapValidatedUTF8StringIntoPPVar
19. AsArrayBufferVar
20. GetType
21. FromPPVar

// 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/shared_impl/var.h"

#include <limits>

#include "base/logging.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "ppapi/c/pp_var.h"
#include "ppapi/shared_impl/ppapi_globals.h"
#include "ppapi/shared_impl/resource_var.h"
#include "ppapi/shared_impl/var_tracker.h"

namespace ppapi {

// Var -------------------------------------------------------------------------

// static
std::string Var::PPVarToLogString(PP_Var var) {
  switch (var.type) {
    case PP_VARTYPE_UNDEFINED:
      return "[Undefined]";
    case PP_VARTYPE_NULL:
      return "[Null]";
    case PP_VARTYPE_BOOL:
      return var.value.as_bool ? "[True]" : "[False]";
    case PP_VARTYPE_INT32:
      return base::IntToString(var.value.as_int);
    case PP_VARTYPE_DOUBLE:
      return base::DoubleToString(var.value.as_double);
    case PP_VARTYPE_STRING: {
      StringVar* string(StringVar::FromPPVar(var));
      if (!string)
        return "[Invalid string]";

      // Since this is for logging, escape NULLs, truncate length.
      std::string result;
      const size_t kTruncateAboveLength = 128;
      if (string->value().size() > kTruncateAboveLength)
        result = string->value().substr(0, kTruncateAboveLength) + "...";
      else
        result = string->value();

      std::string null;
      null.push_back(0);
      ReplaceSubstringsAfterOffset(&result, 0, null, "\\0");
      return result;
    }
    case PP_VARTYPE_OBJECT:
      return "[Object]";
    case PP_VARTYPE_ARRAY:
      return "[Array]";
    case PP_VARTYPE_DICTIONARY:
      return "[Dictionary]";
    case PP_VARTYPE_ARRAY_BUFFER:
      return "[Array buffer]";
    case PP_VARTYPE_RESOURCE: {
      ResourceVar* resource(ResourceVar::FromPPVar(var));
      if (!resource)
        return "[Invalid resource]";

      if (resource->IsPending()) {
        return base::StringPrintf("[Pending resource]");
      } else if (resource->GetPPResource()) {
        return base::StringPrintf("[Resource %d]", resource->GetPPResource());
      } else {
        return "[Null resource]";
      }
    }
    default:
      return "[Invalid var]";
  }
}

StringVar* Var::AsStringVar() { return NULL; }

ArrayBufferVar* Var::AsArrayBufferVar() { return NULL; }

NPObjectVar* Var::AsNPObjectVar() { return NULL; }

ProxyObjectVar* Var::AsProxyObjectVar() { return NULL; }

ArrayVar* Var::AsArrayVar() { return NULL; }

DictionaryVar* Var::AsDictionaryVar() { return NULL; }

ResourceVar* Var::AsResourceVar() { return NULL; }

PP_Var Var::GetPPVar() {
  int32 id = GetOrCreateVarID();
  if (!id)
    return PP_MakeNull();

  PP_Var result;
  result.type = GetType();
  result.padding = 0;
  result.value.as_id = id;
  return result;
}

int32 Var::GetExistingVarID() const { return var_id_; }

Var::Var() : var_id_(0) {}

Var::~Var() {}

int32 Var::GetOrCreateVarID() {
  VarTracker* tracker = PpapiGlobals::Get()->GetVarTracker();
  if (var_id_) {
    if (!tracker->AddRefVar(var_id_))
      return 0;
  } else {
    var_id_ = tracker->AddVar(this);
    if (!var_id_)
      return 0;
  }
  return var_id_;
}

void Var::AssignVarID(int32 id) {
  DCHECK(!var_id_);  // Must not have already been generated.
  var_id_ = id;
}

// StringVar -------------------------------------------------------------------

StringVar::StringVar() {}

StringVar::StringVar(const std::string& str) : value_(str) {}

StringVar::StringVar(const char* str, uint32 len) : value_(str, len) {}

StringVar::~StringVar() {}

StringVar* StringVar::AsStringVar() { return this; }

PP_VarType StringVar::GetType() const { return PP_VARTYPE_STRING; }

// static
PP_Var StringVar::StringToPPVar(const std::string& var) {
  return StringToPPVar(var.c_str(), static_cast<uint32>(var.size()));
}

// static
PP_Var StringVar::StringToPPVar(const char* data, uint32 len) {
  scoped_refptr<StringVar> str(new StringVar(data, len));
  if (!str.get() || !IsStringUTF8(str->value()))
    return PP_MakeNull();
  return str->GetPPVar();
}

// static
StringVar* StringVar::FromPPVar(PP_Var var) {
  if (var.type != PP_VARTYPE_STRING)
    return NULL;
  scoped_refptr<Var> var_object(
      PpapiGlobals::Get()->GetVarTracker()->GetVar(var));
  if (!var_object.get())
    return NULL;
  return var_object->AsStringVar();
}

// static
PP_Var StringVar::SwapValidatedUTF8StringIntoPPVar(std::string* src) {
  scoped_refptr<StringVar> str(new StringVar);
  str->value_.swap(*src);
  return str->GetPPVar();
}

// ArrayBufferVar --------------------------------------------------------------

ArrayBufferVar::ArrayBufferVar() {}

ArrayBufferVar::~ArrayBufferVar() {}

ArrayBufferVar* ArrayBufferVar::AsArrayBufferVar() { return this; }

PP_VarType ArrayBufferVar::GetType() const { return PP_VARTYPE_ARRAY_BUFFER; }

// static
ArrayBufferVar* ArrayBufferVar::FromPPVar(PP_Var var) {
  if (var.type != PP_VARTYPE_ARRAY_BUFFER)
    return NULL;
  scoped_refptr<Var> var_object(
      PpapiGlobals::Get()->GetVarTracker()->GetVar(var));
  if (!var_object.get())
    return NULL;
  return var_object->AsArrayBufferVar();
}

}  // namespace ppapi