forked from mirrors/gecko-dev
fd95099ac3
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 : rebase_source : 25f1ce804b9a53e0a0a4023a1aa91f1a0ed98547
56 lines
1.8 KiB
C++
56 lines
1.8 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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#include "nsILocalFile.h"
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#include "nsCRT.h"
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#include "nsIFile.h"
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#include "nsISupportsImpl.h"
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#include "nsCheckSummedOutputStream.h"
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////////////////////////////////////////////////////////////////////////////////
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// nsCheckSummedOutputStream
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NS_IMPL_ISUPPORTS_INHERITED(nsCheckSummedOutputStream,
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nsBufferedOutputStream,
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nsISafeOutputStream)
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NS_IMETHODIMP
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nsCheckSummedOutputStream::Init(nsIOutputStream* stream, uint32_t bufferSize)
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{
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nsresult rv;
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mHash = do_CreateInstance(NS_CRYPTO_HASH_CONTRACTID, &rv);
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NS_ENSURE_SUCCESS(rv, rv);
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rv = mHash->Init(nsICryptoHash::MD5);
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NS_ENSURE_SUCCESS(rv, rv);
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return nsBufferedOutputStream::Init(stream, bufferSize);
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}
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NS_IMETHODIMP
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nsCheckSummedOutputStream::Finish()
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{
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nsresult rv = mHash->Finish(false, mCheckSum);
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NS_ENSURE_SUCCESS(rv, rv);
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uint32_t written;
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rv = nsBufferedOutputStream::Write(reinterpret_cast<const char*>(mCheckSum.BeginReading()),
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mCheckSum.Length(), &written);
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NS_ASSERTION(written == mCheckSum.Length(), "Error writing stream checksum");
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NS_ENSURE_SUCCESS(rv, rv);
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return nsBufferedOutputStream::Finish();
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}
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NS_IMETHODIMP
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nsCheckSummedOutputStream::Write(const char *buf, uint32_t count, uint32_t *result)
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{
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nsresult rv = mHash->Update(reinterpret_cast<const uint8_t*>(buf), count);
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NS_ENSURE_SUCCESS(rv, rv);
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return nsBufferedOutputStream::Write(buf, count, result);
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}
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////////////////////////////////////////////////////////////////////////////////
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