mirror of
https://github.com/roytam1/UXP.git
synced 2026-05-26 23:18:26 +00:00
Thomas Nguyen
787c782fd8
We write a lot of 4-bytes prefixes to file which call many system calls. We should use a buffer and only write to file if the buffer is full or finish writing. nsIBufferedOutputStream is a good candidate to do that MozReview-Commit-ID: CzGOd7iXVTv --HG-- extra : source : 8f2b4efc5f0d3191a7e80d9324933621e111b44a
60 lines
1.9 KiB
C++
60 lines
1.9 KiB
C++
//* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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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#ifndef nsCheckSummedOutputStream_h__
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#define nsCheckSummedOutputStream_h__
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#include "nsILocalFile.h"
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#include "nsIFile.h"
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#include "nsIOutputStream.h"
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#include "nsICryptoHash.h"
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#include "nsNetCID.h"
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#include "nsString.h"
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#include "nsToolkitCompsCID.h"
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#include "../../../netwerk/base/nsBufferedStreams.h"
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#include "prio.h"
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class nsCheckSummedOutputStream : public nsBufferedOutputStream
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{
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public:
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NS_DECL_ISUPPORTS_INHERITED
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// Size of MD5 hash in bytes
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static const uint32_t CHECKSUM_SIZE = 16;
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static const uint32_t MAX_BUFFER_SIZE = 64 * 1024;
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nsCheckSummedOutputStream() {}
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NS_IMETHOD Finish() override;
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NS_IMETHOD Write(const char *buf, uint32_t count, uint32_t *result) override;
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NS_IMETHOD Init(nsIOutputStream* stream, uint32_t bufferSize) override;
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protected:
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virtual ~nsCheckSummedOutputStream() { nsBufferedOutputStream::Close(); }
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nsCOMPtr<nsICryptoHash> mHash;
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nsCString mCheckSum;
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};
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// returns a file output stream which can be QI'ed to nsIFileOutputStream.
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inline nsresult
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NS_NewCheckSummedOutputStream(nsIOutputStream **result,
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nsIFile *file)
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{
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nsCOMPtr<nsIOutputStream> localOutFile;
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nsresult rv = NS_NewSafeLocalFileOutputStream(getter_AddRefs(localOutFile), file,
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PR_WRONLY | PR_TRUNCATE | PR_CREATE_FILE);
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NS_ENSURE_SUCCESS(rv, rv);
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nsCOMPtr<nsIBufferedOutputStream> out = new nsCheckSummedOutputStream();
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rv = out->Init(localOutFile, nsCheckSummedOutputStream::CHECKSUM_SIZE);
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if (NS_SUCCEEDED(rv)) {
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out.forget(result);
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}
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return rv;
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}
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#endif
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