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/* -*- 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/. */
#include "XMLHttpRequestString.h"
#include "mozilla/Mutex.h"
#include "nsISupportsImpl.h"
#include "mozilla/dom/DOMString.h"
namespace mozilla {
namespace dom {
class XMLHttpRequestStringBuffer final
{
friend class XMLHttpRequestStringWriterHelper;
friend class XMLHttpRequestStringSnapshotReaderHelper;
public:
NS_INLINE_DECL_THREADSAFE_REFCOUNTING(XMLHttpRequestStringBuffer)
NS_DECL_OWNINGTHREAD
XMLHttpRequestStringBuffer()
: mMutex("XMLHttpRequestStringBuffer::mMutex")
{
}
uint32_t
Length()
{
MutexAutoLock lock(mMutex);
return mData.Length();
}
uint32_t
UnsafeLength() const
{
return mData.Length();
}
void
Append(const nsAString& aString)
{
NS_ASSERT_OWNINGTHREAD(XMLHttpRequestStringBuffer);
MutexAutoLock lock(mMutex);
mData.Append(aString);
}
MOZ_MUST_USE bool
GetAsString(nsAString& aString)
{
MutexAutoLock lock(mMutex);
return aString.Assign(mData, mozilla::fallible);
}
size_t
SizeOfThis(MallocSizeOf aMallocSizeOf) const
{
return mData.SizeOfExcludingThisIfUnshared(aMallocSizeOf);
}
MOZ_MUST_USE bool
GetAsString(DOMString& aString, uint32_t aLength)
{
MutexAutoLock lock(mMutex);
MOZ_ASSERT(aLength <= mData.Length());
nsStringBuffer* buf = nsStringBuffer::FromString(mData);
if (buf) {
// We have to use SetEphemeralStringBuffer, because once we release our
// mutex mData can get mutated from some other thread while the DOMString
// is still alive.
aString.SetEphemeralStringBuffer(buf, aLength);
return true;
}
// We can get here if mData is empty. In that case it won't have an
// nsStringBuffer....
MOZ_ASSERT(mData.IsEmpty());
return aString.AsAString().Assign(mData.BeginReading(), aLength,
mozilla::fallible);
}
void
CreateSnapshot(XMLHttpRequestStringSnapshot& aSnapshot)
{
MutexAutoLock lock(mMutex);
aSnapshot.Set(this, mData.Length());
}
private:
~XMLHttpRequestStringBuffer()
{}
nsString& UnsafeData()
{
return mData;
}
Mutex mMutex;
// The following member variable is protected by mutex.
nsString mData;
};
// ---------------------------------------------------------------------------
// XMLHttpRequestString
XMLHttpRequestString::XMLHttpRequestString()
: mBuffer(new XMLHttpRequestStringBuffer())
{
}
XMLHttpRequestString::~XMLHttpRequestString()
{
}
void
XMLHttpRequestString::Truncate()
{
mBuffer = new XMLHttpRequestStringBuffer();
}
uint32_t
XMLHttpRequestString::Length() const
{
return mBuffer->Length();
}
void
XMLHttpRequestString::Append(const nsAString& aString)
{
mBuffer->Append(aString);
}
bool
XMLHttpRequestString::GetAsString(nsAString& aString) const
{
return mBuffer->GetAsString(aString);
}
size_t
XMLHttpRequestString::SizeOfThis(MallocSizeOf aMallocSizeOf) const
{
return mBuffer->SizeOfThis(aMallocSizeOf);
}
bool
XMLHttpRequestString::IsEmpty() const
{
return !mBuffer->Length();
}
void
XMLHttpRequestString::CreateSnapshot(XMLHttpRequestStringSnapshot& aSnapshot)
{
mBuffer->CreateSnapshot(aSnapshot);
}
// ---------------------------------------------------------------------------
// XMLHttpRequestStringSnapshot
XMLHttpRequestStringSnapshot::XMLHttpRequestStringSnapshot()
: mLength(0)
, mVoid(false)
{
}
XMLHttpRequestStringSnapshot::~XMLHttpRequestStringSnapshot()
{
}
XMLHttpRequestStringSnapshot&
XMLHttpRequestStringSnapshot::operator=(const XMLHttpRequestStringSnapshot& aOther)
{
mBuffer = aOther.mBuffer;
mLength = aOther.mLength;
mVoid = aOther.mVoid;
return *this;
}
void
XMLHttpRequestStringSnapshot::ResetInternal(bool aIsVoid)
{
mBuffer = nullptr;
mLength = 0;
mVoid = aIsVoid;
}
void
XMLHttpRequestStringSnapshot::Set(XMLHttpRequestStringBuffer* aBuffer,
uint32_t aLength)
{
MOZ_ASSERT(aBuffer);
MOZ_ASSERT(aLength <= aBuffer->UnsafeLength());
mBuffer = aBuffer;
mLength = aLength;
mVoid = false;
}
bool
XMLHttpRequestStringSnapshot::GetAsString(DOMString& aString) const
{
if (mBuffer) {
MOZ_ASSERT(!mVoid);
return mBuffer->GetAsString(aString, mLength);
}
if (mVoid) {
aString.SetNull();
}
return true;
}
// ---------------------------------------------------------------------------
// XMLHttpRequestStringWriterHelper
XMLHttpRequestStringWriterHelper::XMLHttpRequestStringWriterHelper(XMLHttpRequestString& aString)
: mBuffer(aString.mBuffer)
, mLock(aString.mBuffer->mMutex)
{
}
bool
XMLHttpRequestStringWriterHelper::AddCapacity(int32_t aCapacity)
{
return mBuffer->UnsafeData().SetCapacity(mBuffer->UnsafeLength() + aCapacity, fallible);
}
char16_t*
XMLHttpRequestStringWriterHelper::EndOfExistingData()
{
return mBuffer->UnsafeData().BeginWriting() + mBuffer->UnsafeLength();
}
void
XMLHttpRequestStringWriterHelper::AddLength(int32_t aLength)
{
mBuffer->UnsafeData().SetLength(mBuffer->UnsafeLength() + aLength);
}
// ---------------------------------------------------------------------------
// XMLHttpRequestStringReaderHelper
XMLHttpRequestStringSnapshotReaderHelper::XMLHttpRequestStringSnapshotReaderHelper(XMLHttpRequestStringSnapshot& aSnapshot)
: mBuffer(aSnapshot.mBuffer)
, mLock(aSnapshot.mBuffer->mMutex)
{
}
const char16_t*
XMLHttpRequestStringSnapshotReaderHelper::Buffer() const
{
return mBuffer->UnsafeData().BeginReading();
}
uint32_t
XMLHttpRequestStringSnapshotReaderHelper::Length() const
{
return mBuffer->UnsafeLength();
}
} // dom namespace
} // mozilla namespace
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