mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-27 14:52:16 +00:00
132 lines
3.9 KiB
C++
132 lines
3.9 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
#ifndef mozilla_dom_XMLHttpRequestString_h
|
|
#define mozilla_dom_XMLHttpRequestString_h
|
|
|
|
#include "mozilla/Mutex.h"
|
|
#include "nsString.h"
|
|
|
|
struct JSContext;
|
|
class JSString;
|
|
|
|
namespace mozilla::dom {
|
|
|
|
class ArrayBufferBuilder;
|
|
class BlobImpl;
|
|
class DOMString;
|
|
class XMLHttpRequestStringBuffer;
|
|
class XMLHttpRequestStringSnapshot;
|
|
class XMLHttpRequestStringWriterHelper;
|
|
|
|
// We want to avoid the dup of strings when XHR in workers has access to
|
|
// responseText for events dispatched during the loading state. For this reason
|
|
// we use this class, able to create snapshots of the current size of itself
|
|
// without making extra copies.
|
|
class XMLHttpRequestString final {
|
|
friend class XMLHttpRequestStringWriterHelper;
|
|
|
|
public:
|
|
XMLHttpRequestString();
|
|
~XMLHttpRequestString();
|
|
|
|
void Truncate();
|
|
|
|
uint32_t Length() const;
|
|
|
|
void Append(const nsAString& aString);
|
|
|
|
// This method should be called only when the string is really needed because
|
|
// it can cause the duplication of the strings in case the loading of the XHR
|
|
// is not completed yet.
|
|
[[nodiscard]] bool GetAsString(nsAString& aString) const;
|
|
|
|
size_t SizeOfThis(MallocSizeOf aMallocSizeOf) const;
|
|
|
|
const char16_t* Data() const;
|
|
|
|
bool IsEmpty() const;
|
|
|
|
void CreateSnapshot(XMLHttpRequestStringSnapshot& aSnapshot);
|
|
|
|
private:
|
|
XMLHttpRequestString(const XMLHttpRequestString&) = delete;
|
|
XMLHttpRequestString& operator=(const XMLHttpRequestString&) = delete;
|
|
XMLHttpRequestString& operator=(const XMLHttpRequestString&&) = delete;
|
|
|
|
RefPtr<XMLHttpRequestStringBuffer> mBuffer;
|
|
};
|
|
|
|
// This class locks the buffer and allows the callee to write data into it.
|
|
class MOZ_STACK_CLASS XMLHttpRequestStringWriterHelper final {
|
|
public:
|
|
explicit XMLHttpRequestStringWriterHelper(XMLHttpRequestString& aString);
|
|
~XMLHttpRequestStringWriterHelper();
|
|
|
|
/**
|
|
* The existing length of the string. Do not call during BulkWrite().
|
|
*/
|
|
uint32_t Length() const;
|
|
|
|
mozilla::Result<mozilla::BulkWriteHandle<char16_t>, nsresult> BulkWrite(
|
|
uint32_t aCapacity);
|
|
|
|
private:
|
|
XMLHttpRequestStringWriterHelper(const XMLHttpRequestStringWriterHelper&) =
|
|
delete;
|
|
XMLHttpRequestStringWriterHelper& operator=(
|
|
const XMLHttpRequestStringWriterHelper&) = delete;
|
|
XMLHttpRequestStringWriterHelper& operator=(
|
|
const XMLHttpRequestStringWriterHelper&&) = delete;
|
|
|
|
RefPtr<XMLHttpRequestStringBuffer> mBuffer;
|
|
MutexAutoLock mLock;
|
|
};
|
|
|
|
// This class is the internal XMLHttpRequestStringBuffer of the
|
|
// XMLHttpRequestString plus the current length. GetAsString will return the
|
|
// string with that particular length also if the XMLHttpRequestStringBuffer is
|
|
// grown in the meantime.
|
|
class XMLHttpRequestStringSnapshot final {
|
|
friend class XMLHttpRequestStringBuffer;
|
|
|
|
public:
|
|
XMLHttpRequestStringSnapshot();
|
|
~XMLHttpRequestStringSnapshot();
|
|
|
|
XMLHttpRequestStringSnapshot& operator=(const XMLHttpRequestStringSnapshot&) =
|
|
delete;
|
|
|
|
void Reset() { ResetInternal(false /* isVoid */); }
|
|
|
|
void SetVoid() { ResetInternal(true /* isVoid */); }
|
|
|
|
bool IsVoid() const { return mVoid; }
|
|
|
|
bool IsEmpty() const { return !mLength; }
|
|
|
|
[[nodiscard]] bool GetAsString(DOMString& aString) const;
|
|
|
|
JSString* GetAsJSStringCopy(JSContext* aCx) const;
|
|
|
|
private:
|
|
XMLHttpRequestStringSnapshot(const XMLHttpRequestStringSnapshot&) = delete;
|
|
XMLHttpRequestStringSnapshot& operator=(
|
|
const XMLHttpRequestStringSnapshot&&) = delete;
|
|
|
|
void Set(XMLHttpRequestStringBuffer* aBuffer, uint32_t aLength);
|
|
|
|
void ResetInternal(bool aIsVoid);
|
|
|
|
RefPtr<XMLHttpRequestStringBuffer> mBuffer;
|
|
uint32_t mLength;
|
|
bool mVoid;
|
|
};
|
|
|
|
} // namespace mozilla::dom
|
|
|
|
#endif // mozilla_dom_XMLHttpRequestString_h
|