92 lines
2.9 KiB
C++
92 lines
2.9 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "EncodedBufferCache.h"
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#include "mozilla/dom/File.h"
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#include "nsAnonymousTemporaryFile.h"
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#include "prio.h"
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namespace mozilla {
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void
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EncodedBufferCache::AppendBuffer(nsTArray<uint8_t> & aBuf)
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{
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MutexAutoLock lock(mMutex);
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mDataSize += aBuf.Length();
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mEncodedBuffers.AppendElement()->SwapElements(aBuf);
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if (!mTempFileEnabled && mDataSize > mMaxMemoryStorage) {
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nsresult rv;
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PRFileDesc* tempFD = nullptr;
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{
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// Release the mMutex because there is a sync dispatch to mainthread in
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// NS_OpenAnonymousTemporaryFile.
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MutexAutoUnlock unlock(mMutex);
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rv = NS_OpenAnonymousTemporaryFile(&tempFD);
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}
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if (!NS_FAILED(rv)) {
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// Check the mDataSize again since we release the mMutex before.
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if (mDataSize > mMaxMemoryStorage) {
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mFD = tempFD;
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mTempFileEnabled = true;
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} else {
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// Close the tempFD because the data had been taken during the
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// MutexAutoUnlock.
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PR_Close(tempFD);
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}
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}
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}
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if (mTempFileEnabled) {
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// has created temporary file, write buffer in it
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for (uint32_t i = 0; i < mEncodedBuffers.Length(); i++) {
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int32_t amount = PR_Write(mFD, mEncodedBuffers.ElementAt(i).Elements(), mEncodedBuffers.ElementAt(i).Length());
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if (amount < 0 || size_t(amount) < mEncodedBuffers.ElementAt(i).Length()) {
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NS_WARNING("Failed to write media cache block!");
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}
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}
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mEncodedBuffers.Clear();
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}
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}
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already_AddRefed<dom::Blob>
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EncodedBufferCache::ExtractBlob(nsISupports* aParent,
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const nsAString &aContentType)
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{
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MutexAutoLock lock(mMutex);
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RefPtr<dom::Blob> blob;
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if (mTempFileEnabled) {
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// generate new temporary file to write
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blob = dom::Blob::CreateTemporaryBlob(aParent, mFD, 0, mDataSize,
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aContentType);
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// fallback to memory blob
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mTempFileEnabled = false;
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mDataSize = 0;
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mFD = nullptr;
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} else {
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void* blobData = malloc(mDataSize);
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NS_ASSERTION(blobData, "out of memory!!");
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if (blobData) {
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for (uint32_t i = 0, offset = 0; i < mEncodedBuffers.Length(); i++) {
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memcpy((uint8_t*)blobData + offset, mEncodedBuffers.ElementAt(i).Elements(),
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mEncodedBuffers.ElementAt(i).Length());
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offset += mEncodedBuffers.ElementAt(i).Length();
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}
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blob = dom::Blob::CreateMemoryBlob(aParent, blobData, mDataSize,
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aContentType);
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mEncodedBuffers.Clear();
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} else
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return nullptr;
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}
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mDataSize = 0;
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return blob.forget();
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}
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} // namespace mozilla
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