gecko-dev/dom/base/BlobSet.h

91 lines
2.3 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_BlobSet_h
#define mozilla_dom_BlobSet_h
#include "mozilla/CheckedInt.h"
#include "mozilla/dom/File.h"
namespace mozilla {
namespace dom {
class BlobSet {
public:
BlobSet()
: mData(nullptr), mDataLen(0), mDataBufferLen(0)
{}
~BlobSet()
{
free(mData);
}
nsresult AppendVoidPtr(const void* aData, uint32_t aLength);
nsresult AppendString(const nsAString& aString, bool nativeEOL, JSContext* aCx);
nsresult AppendBlobImpl(BlobImpl* aBlobImpl);
nsresult AppendBlobImpls(const nsTArray<RefPtr<BlobImpl>>& aBlobImpls);
nsTArray<RefPtr<BlobImpl>>& GetBlobImpls() { Flush(); return mBlobImpls; }
already_AddRefed<Blob> GetBlobInternal(nsISupports* aParent,
const nsACString& aContentType,
ErrorResult& aRv);
protected:
bool ExpandBufferSize(uint64_t aSize)
{
using mozilla::CheckedUint32;
if (mDataBufferLen >= mDataLen + aSize) {
mDataLen += aSize;
return true;
}
// Start at 1 or we'll loop forever.
CheckedUint32 bufferLen =
std::max<uint32_t>(static_cast<uint32_t>(mDataBufferLen), 1);
while (bufferLen.isValid() && bufferLen.value() < mDataLen + aSize)
bufferLen *= 2;
if (!bufferLen.isValid())
return false;
void* data = realloc(mData, bufferLen.value());
if (!data)
return false;
mData = data;
mDataBufferLen = bufferLen.value();
mDataLen += aSize;
return true;
}
void Flush() {
if (mData) {
// If we have some data, create a blob for it
// and put it on the stack
RefPtr<BlobImpl> blobImpl =
new BlobImplMemory(mData, mDataLen, EmptyString());
mBlobImpls.AppendElement(blobImpl);
mData = nullptr; // The nsDOMMemoryFile takes ownership of the buffer
mDataLen = 0;
mDataBufferLen = 0;
}
}
nsTArray<RefPtr<BlobImpl>> mBlobImpls;
void* mData;
uint64_t mDataLen;
uint64_t mDataBufferLen;
};
} // namespace dom
} // namespace mozilla
#endif // mozilla_dom_BlobSet_h