third_party/WebKit/Source/core/frame/DOMWindowBase64.cpp

/*
 * Copyright (C) 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
 * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
 * Copyright (C) 2013 Samsung Electronics. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
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 * notice, this list of conditions and the following disclaimer.
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#include "core/frame/DOMWindowBase64.h"

#include "bindings/core/v8/ExceptionState.h"
#include "core/dom/ExceptionCode.h"
#include "core/html/parser/HTMLParserIdioms.h"
#include "platform/wtf/text/Base64.h"

namespace blink {

String DOMWindowBase64::btoa(const String& string_to_encode,
                             ExceptionState& exception_state) {
  if (string_to_encode.IsNull())
    return String();

  if (!string_to_encode.ContainsOnlyLatin1()) {
    exception_state.ThrowDOMException(
        kInvalidCharacterError,
        "The string to be encoded contains "
        "characters outside of the Latin1 range.");
    return String();
  }

  return Base64Encode(string_to_encode.Latin1());
}

String DOMWindowBase64::atob(const String& encoded_string,
                             ExceptionState& exception_state) {
  if (encoded_string.IsNull())
    return String();

  if (!encoded_string.ContainsOnlyLatin1()) {
    exception_state.ThrowDOMException(
        kInvalidCharacterError,
        "The string to be decoded contains "
        "characters outside of the Latin1 range.");
    return String();
  }
  Vector<char> out;
  if (!Base64Decode(encoded_string, out, IsHTMLSpace<UChar>,
                    kBase64ValidatePadding)) {
    exception_state.ThrowDOMException(
        kInvalidCharacterError,
        "The string to be decoded is not correctly encoded.");
    return String();
  }

  return String(out.data(), out.size());
}

}  // namespace blink