mirror of
https://github.com/classilla/tenfourfox.git
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638 lines
17 KiB
C++
638 lines
17 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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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/*
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* The storage stream provides an internal buffer that can be filled by a
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* client using a single output stream. One or more independent input streams
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* can be created to read the data out non-destructively. The implementation
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* uses a segmented buffer internally to avoid realloc'ing of large buffers,
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* with the attendant performance loss and heap fragmentation.
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*/
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#include "nsAlgorithm.h"
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#include "nsStorageStream.h"
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#include "nsSegmentedBuffer.h"
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#include "nsStreamUtils.h"
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#include "nsCOMPtr.h"
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#include "nsICloneableInputStream.h"
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#include "nsIInputStream.h"
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#include "nsIIPCSerializableInputStream.h"
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#include "nsISeekableStream.h"
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#include "mozilla/Logging.h"
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#include "mozilla/Attributes.h"
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#include "mozilla/Likely.h"
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#include "mozilla/MathAlgorithms.h"
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#include "mozilla/ipc/InputStreamUtils.h"
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using mozilla::ipc::InputStreamParams;
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using mozilla::ipc::StringInputStreamParams;
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//
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// Log module for StorageStream logging...
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//
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// To enable logging (see prlog.h for full details):
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//
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// set NSPR_LOG_MODULES=StorageStreamLog:5
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// set NSPR_LOG_FILE=nspr.log
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//
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// this enables LogLevel::Debug level information and places all output in
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// the file nspr.log
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//
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static LazyLogModule sStorageStreamLog("nsStorageStream");
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#ifdef LOG
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#undef LOG
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#endif
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#define LOG(args) MOZ_LOG(sStorageStreamLog, mozilla::LogLevel::Debug, args)
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nsStorageStream::nsStorageStream()
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: mSegmentedBuffer(0), mSegmentSize(0), mWriteInProgress(false),
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mLastSegmentNum(-1), mWriteCursor(0), mSegmentEnd(0), mLogicalLength(0)
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{
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LOG(("Creating nsStorageStream [%p].\n", this));
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}
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nsStorageStream::~nsStorageStream()
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{
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delete mSegmentedBuffer;
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}
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NS_IMPL_ISUPPORTS(nsStorageStream,
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nsIStorageStream,
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nsIOutputStream)
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NS_IMETHODIMP
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nsStorageStream::Init(uint32_t aSegmentSize, uint32_t aMaxSize)
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{
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mSegmentedBuffer = new nsSegmentedBuffer();
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mSegmentSize = aSegmentSize;
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mSegmentSizeLog2 = mozilla::FloorLog2(aSegmentSize);
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// Segment size must be a power of two
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if (mSegmentSize != ((uint32_t)1 << mSegmentSizeLog2)) {
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return NS_ERROR_INVALID_ARG;
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}
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return mSegmentedBuffer->Init(aSegmentSize, aMaxSize);
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}
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NS_IMETHODIMP
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nsStorageStream::GetOutputStream(int32_t aStartingOffset,
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nsIOutputStream** aOutputStream)
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{
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if (NS_WARN_IF(!aOutputStream)) {
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return NS_ERROR_INVALID_ARG;
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}
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if (NS_WARN_IF(!mSegmentedBuffer)) {
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return NS_ERROR_NOT_INITIALIZED;
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}
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if (mWriteInProgress) {
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return NS_ERROR_NOT_AVAILABLE;
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}
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nsresult rv = Seek(aStartingOffset);
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if (NS_FAILED(rv)) {
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return rv;
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}
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// Enlarge the last segment in the buffer so that it is the same size as
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// all the other segments in the buffer. (It may have been realloc'ed
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// smaller in the Close() method.)
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if (mLastSegmentNum >= 0)
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if (mSegmentedBuffer->ReallocLastSegment(mSegmentSize)) {
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// Need to re-Seek, since realloc changed segment base pointer
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rv = Seek(aStartingOffset);
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if (NS_FAILED(rv)) {
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return rv;
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}
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}
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NS_ADDREF(this);
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*aOutputStream = static_cast<nsIOutputStream*>(this);
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mWriteInProgress = true;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStorageStream::Close()
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{
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if (NS_WARN_IF(!mSegmentedBuffer)) {
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return NS_ERROR_NOT_INITIALIZED;
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}
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mWriteInProgress = false;
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int32_t segmentOffset = SegOffset(mLogicalLength);
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// Shrink the final segment in the segmented buffer to the minimum size
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// needed to contain the data, so as to conserve memory.
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if (segmentOffset) {
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mSegmentedBuffer->ReallocLastSegment(segmentOffset);
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}
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mWriteCursor = 0;
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mSegmentEnd = 0;
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LOG(("nsStorageStream [%p] Close mWriteCursor=%x mSegmentEnd=%x\n",
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this, mWriteCursor, mSegmentEnd));
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStorageStream::Flush()
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{
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStorageStream::Write(const char* aBuffer, uint32_t aCount,
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uint32_t* aNumWritten)
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{
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if (NS_WARN_IF(!aNumWritten) || NS_WARN_IF(!aBuffer)) {
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return NS_ERROR_INVALID_ARG;
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}
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if (NS_WARN_IF(!mSegmentedBuffer)) {
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return NS_ERROR_NOT_INITIALIZED;
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}
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const char* readCursor;
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uint32_t count, availableInSegment, remaining;
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nsresult rv = NS_OK;
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LOG(("nsStorageStream [%p] Write mWriteCursor=%x mSegmentEnd=%x aCount=%d\n",
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this, mWriteCursor, mSegmentEnd, aCount));
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remaining = aCount;
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readCursor = aBuffer;
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// If no segments have been created yet, create one even if we don't have
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// to write any data; this enables creating an input stream which reads from
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// the very end of the data for any amount of data in the stream (i.e.
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// this stream contains N bytes of data and newInputStream(N) is called),
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// even for N=0 (with the caveat that we require .write("", 0) be called to
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// initialize internal buffers).
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bool firstTime = mSegmentedBuffer->GetSegmentCount() == 0;
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while (remaining || MOZ_UNLIKELY(firstTime)) {
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firstTime = false;
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availableInSegment = mSegmentEnd - mWriteCursor;
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if (!availableInSegment) {
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mWriteCursor = mSegmentedBuffer->AppendNewSegment();
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if (!mWriteCursor) {
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mSegmentEnd = 0;
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rv = NS_ERROR_OUT_OF_MEMORY;
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goto out;
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}
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mLastSegmentNum++;
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mSegmentEnd = mWriteCursor + mSegmentSize;
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availableInSegment = mSegmentEnd - mWriteCursor;
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LOG(("nsStorageStream [%p] Write (new seg) mWriteCursor=%x mSegmentEnd=%x\n",
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this, mWriteCursor, mSegmentEnd));
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}
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count = XPCOM_MIN(availableInSegment, remaining);
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memcpy(mWriteCursor, readCursor, count);
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remaining -= count;
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readCursor += count;
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mWriteCursor += count;
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LOG(("nsStorageStream [%p] Writing mWriteCursor=%x mSegmentEnd=%x count=%d\n",
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this, mWriteCursor, mSegmentEnd, count));
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};
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out:
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*aNumWritten = aCount - remaining;
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mLogicalLength += *aNumWritten;
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LOG(("nsStorageStream [%p] Wrote mWriteCursor=%x mSegmentEnd=%x numWritten=%d\n",
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this, mWriteCursor, mSegmentEnd, *aNumWritten));
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return rv;
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}
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NS_IMETHODIMP
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nsStorageStream::WriteFrom(nsIInputStream* aInStr, uint32_t aCount,
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uint32_t* aResult)
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{
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return NS_ERROR_NOT_IMPLEMENTED;
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}
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NS_IMETHODIMP
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nsStorageStream::WriteSegments(nsReadSegmentFun aReader, void* aClosure,
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uint32_t aCount, uint32_t* aResult)
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{
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return NS_ERROR_NOT_IMPLEMENTED;
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}
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NS_IMETHODIMP
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nsStorageStream::IsNonBlocking(bool* aNonBlocking)
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{
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*aNonBlocking = false;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStorageStream::GetLength(uint32_t* aLength)
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{
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*aLength = mLogicalLength;
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return NS_OK;
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}
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// Truncate the buffer by deleting the end segments
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NS_IMETHODIMP
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nsStorageStream::SetLength(uint32_t aLength)
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{
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if (NS_WARN_IF(!mSegmentedBuffer)) {
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return NS_ERROR_NOT_INITIALIZED;
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}
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if (mWriteInProgress) {
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return NS_ERROR_NOT_AVAILABLE;
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}
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if (aLength > mLogicalLength) {
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return NS_ERROR_INVALID_ARG;
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}
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int32_t newLastSegmentNum = SegNum(aLength);
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int32_t segmentOffset = SegOffset(aLength);
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if (segmentOffset == 0) {
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newLastSegmentNum--;
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}
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while (newLastSegmentNum < mLastSegmentNum) {
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mSegmentedBuffer->DeleteLastSegment();
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mLastSegmentNum--;
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}
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mLogicalLength = aLength;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStorageStream::GetWriteInProgress(bool* aWriteInProgress)
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{
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*aWriteInProgress = mWriteInProgress;
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return NS_OK;
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}
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NS_METHOD
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nsStorageStream::Seek(int32_t aPosition)
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{
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if (NS_WARN_IF(!mSegmentedBuffer)) {
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return NS_ERROR_NOT_INITIALIZED;
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}
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// An argument of -1 means "seek to end of stream"
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if (aPosition == -1) {
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aPosition = mLogicalLength;
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}
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// Seeking beyond the buffer end is illegal
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if ((uint32_t)aPosition > mLogicalLength) {
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return NS_ERROR_INVALID_ARG;
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}
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// Seeking backwards in the write stream results in truncation
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SetLength(aPosition);
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// Special handling for seek to start-of-buffer
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if (aPosition == 0) {
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mWriteCursor = 0;
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mSegmentEnd = 0;
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LOG(("nsStorageStream [%p] Seek mWriteCursor=%x mSegmentEnd=%x\n",
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this, mWriteCursor, mSegmentEnd));
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return NS_OK;
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}
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// Segment may have changed, so reset pointers
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mWriteCursor = mSegmentedBuffer->GetSegment(mLastSegmentNum);
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NS_ASSERTION(mWriteCursor, "null mWriteCursor");
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mSegmentEnd = mWriteCursor + mSegmentSize;
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// Adjust write cursor for current segment offset. This test is necessary
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// because SegNum may reference the next-to-be-allocated segment, in which
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// case we need to be pointing at the end of the last segment.
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int32_t segmentOffset = SegOffset(aPosition);
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if (segmentOffset == 0 && (SegNum(aPosition) > (uint32_t) mLastSegmentNum)) {
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mWriteCursor = mSegmentEnd;
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} else {
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mWriteCursor += segmentOffset;
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}
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LOG(("nsStorageStream [%p] Seek mWriteCursor=%x mSegmentEnd=%x\n",
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this, mWriteCursor, mSegmentEnd));
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return NS_OK;
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}
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////////////////////////////////////////////////////////////////////////////////
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// There can be many nsStorageInputStreams for a single nsStorageStream
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class nsStorageInputStream final
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: public nsIInputStream
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, public nsISeekableStream
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, public nsIIPCSerializableInputStream
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, public nsICloneableInputStream
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{
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public:
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nsStorageInputStream(nsStorageStream* aStorageStream, uint32_t aSegmentSize)
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: mStorageStream(aStorageStream), mReadCursor(0),
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mSegmentEnd(0), mSegmentNum(0),
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mSegmentSize(aSegmentSize), mLogicalCursor(0),
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mStatus(NS_OK)
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{
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}
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NS_DECL_THREADSAFE_ISUPPORTS
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NS_DECL_NSIINPUTSTREAM
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NS_DECL_NSISEEKABLESTREAM
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NS_DECL_NSIIPCSERIALIZABLEINPUTSTREAM
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NS_DECL_NSICLONEABLEINPUTSTREAM
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private:
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~nsStorageInputStream()
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{
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}
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protected:
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NS_METHOD Seek(uint32_t aPosition);
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friend class nsStorageStream;
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private:
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RefPtr<nsStorageStream> mStorageStream;
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uint32_t mReadCursor; // Next memory location to read byte, or 0
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uint32_t mSegmentEnd; // One byte past end of current buffer segment
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uint32_t mSegmentNum; // Segment number containing read cursor
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uint32_t mSegmentSize; // All segments, except the last, are of this size
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uint32_t mLogicalCursor; // Logical offset into stream
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nsresult mStatus;
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uint32_t SegNum(uint32_t aPosition)
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{
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return aPosition >> mStorageStream->mSegmentSizeLog2;
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}
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uint32_t SegOffset(uint32_t aPosition)
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{
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return aPosition & (mSegmentSize - 1);
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}
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};
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NS_IMPL_ISUPPORTS(nsStorageInputStream,
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nsIInputStream,
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nsISeekableStream,
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nsIIPCSerializableInputStream,
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nsICloneableInputStream)
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NS_IMETHODIMP
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nsStorageStream::NewInputStream(int32_t aStartingOffset,
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nsIInputStream** aInputStream)
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{
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if (NS_WARN_IF(!mSegmentedBuffer)) {
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return NS_ERROR_NOT_INITIALIZED;
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}
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RefPtr<nsStorageInputStream> inputStream =
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new nsStorageInputStream(this, mSegmentSize);
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nsresult rv = inputStream->Seek(aStartingOffset);
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if (NS_FAILED(rv)) {
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return rv;
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}
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inputStream.forget(aInputStream);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStorageInputStream::Close()
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{
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mStatus = NS_BASE_STREAM_CLOSED;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStorageInputStream::Available(uint64_t* aAvailable)
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{
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if (NS_FAILED(mStatus)) {
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return mStatus;
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}
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*aAvailable = mStorageStream->mLogicalLength - mLogicalCursor;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStorageInputStream::Read(char* aBuffer, uint32_t aCount, uint32_t* aNumRead)
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{
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return ReadSegments(NS_CopySegmentToBuffer, aBuffer, aCount, aNumRead);
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}
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NS_IMETHODIMP
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nsStorageInputStream::ReadSegments(nsWriteSegmentFun aWriter, void* aClosure,
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uint32_t aCount, uint32_t* aNumRead)
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{
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*aNumRead = 0;
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if (mStatus == NS_BASE_STREAM_CLOSED) {
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return NS_OK;
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}
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if (NS_FAILED(mStatus)) {
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return mStatus;
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}
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uint32_t count, availableInSegment, remainingCapacity, bytesConsumed;
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nsresult rv;
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remainingCapacity = aCount;
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while (remainingCapacity) {
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availableInSegment = mSegmentEnd - mReadCursor;
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if (!availableInSegment) {
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uint32_t available = mStorageStream->mLogicalLength - mLogicalCursor;
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if (!available) {
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goto out;
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}
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// We have data in the stream, but if mSegmentEnd is zero, then we
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// were likely constructed prior to any data being written into
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// the stream. Therefore, if mSegmentEnd is non-zero, we should
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// move into the next segment; otherwise, we should stay in this
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// segment so our input state can be updated and we can properly
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// perform the initial read.
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if (mSegmentEnd > 0) {
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mSegmentNum++;
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}
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mReadCursor = 0;
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mSegmentEnd = XPCOM_MIN(mSegmentSize, available);
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availableInSegment = mSegmentEnd;
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}
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const char* cur = mStorageStream->mSegmentedBuffer->GetSegment(mSegmentNum);
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count = XPCOM_MIN(availableInSegment, remainingCapacity);
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rv = aWriter(this, aClosure, cur + mReadCursor, aCount - remainingCapacity,
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count, &bytesConsumed);
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if (NS_FAILED(rv) || (bytesConsumed == 0)) {
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break;
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}
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remainingCapacity -= bytesConsumed;
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mReadCursor += bytesConsumed;
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mLogicalCursor += bytesConsumed;
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};
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out:
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*aNumRead = aCount - remainingCapacity;
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bool isWriteInProgress = false;
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if (NS_FAILED(mStorageStream->GetWriteInProgress(&isWriteInProgress))) {
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isWriteInProgress = false;
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}
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if (*aNumRead == 0 && isWriteInProgress) {
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return NS_BASE_STREAM_WOULD_BLOCK;
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStorageInputStream::IsNonBlocking(bool* aNonBlocking)
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{
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// TODO: This class should implement nsIAsyncInputStream so that callers
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// have some way of dealing with NS_BASE_STREAM_WOULD_BLOCK errors.
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*aNonBlocking = true;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStorageInputStream::Seek(int32_t aWhence, int64_t aOffset)
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{
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if (NS_FAILED(mStatus)) {
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return mStatus;
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}
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int64_t pos = aOffset;
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switch (aWhence) {
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case NS_SEEK_SET:
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break;
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case NS_SEEK_CUR:
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pos += mLogicalCursor;
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break;
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case NS_SEEK_END:
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pos += mStorageStream->mLogicalLength;
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break;
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default:
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NS_NOTREACHED("unexpected whence value");
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return NS_ERROR_UNEXPECTED;
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}
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if (pos == int64_t(mLogicalCursor)) {
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return NS_OK;
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}
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return Seek(pos);
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}
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NS_IMETHODIMP
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nsStorageInputStream::Tell(int64_t* aResult)
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{
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if (NS_FAILED(mStatus)) {
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return mStatus;
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|
}
|
|
|
|
*aResult = mLogicalCursor;
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsStorageInputStream::SetEOF()
|
|
{
|
|
NS_NOTREACHED("nsStorageInputStream::SetEOF");
|
|
return NS_ERROR_NOT_IMPLEMENTED;
|
|
}
|
|
|
|
NS_METHOD
|
|
nsStorageInputStream::Seek(uint32_t aPosition)
|
|
{
|
|
uint32_t length = mStorageStream->mLogicalLength;
|
|
if (aPosition > length) {
|
|
return NS_ERROR_INVALID_ARG;
|
|
}
|
|
|
|
if (length == 0) {
|
|
return NS_OK;
|
|
}
|
|
|
|
mSegmentNum = SegNum(aPosition);
|
|
mReadCursor = SegOffset(aPosition);
|
|
uint32_t available = length - aPosition;
|
|
mSegmentEnd = mReadCursor + XPCOM_MIN(mSegmentSize - mReadCursor, available);
|
|
mLogicalCursor = aPosition;
|
|
return NS_OK;
|
|
}
|
|
|
|
void
|
|
nsStorageInputStream::Serialize(InputStreamParams& aParams, FileDescriptorArray&)
|
|
{
|
|
nsCString combined;
|
|
int64_t offset;
|
|
mozilla::DebugOnly<nsresult> rv = Tell(&offset);
|
|
MOZ_ASSERT(NS_SUCCEEDED(rv));
|
|
|
|
uint64_t remaining;
|
|
rv = Available(&remaining);
|
|
MOZ_ASSERT(NS_SUCCEEDED(rv));
|
|
|
|
combined.SetCapacity(remaining);
|
|
uint32_t numRead = 0;
|
|
|
|
rv = Read(combined.BeginWriting(), remaining, &numRead);
|
|
MOZ_ASSERT(NS_SUCCEEDED(rv));
|
|
MOZ_ASSERT(numRead == remaining);
|
|
combined.SetLength(numRead);
|
|
|
|
rv = Seek(NS_SEEK_SET, offset);
|
|
MOZ_ASSERT(NS_SUCCEEDED(rv));
|
|
|
|
StringInputStreamParams params;
|
|
params.data() = combined;
|
|
aParams = params;
|
|
}
|
|
|
|
bool
|
|
nsStorageInputStream::Deserialize(const InputStreamParams& aParams,
|
|
const FileDescriptorArray&)
|
|
{
|
|
NS_NOTREACHED("We should never attempt to deserialize a storage input stream.");
|
|
return false;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsStorageInputStream::GetCloneable(bool* aCloneableOut)
|
|
{
|
|
*aCloneableOut = true;
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsStorageInputStream::Clone(nsIInputStream** aCloneOut)
|
|
{
|
|
return mStorageStream->NewInputStream(mLogicalCursor, aCloneOut);
|
|
}
|
|
|
|
nsresult
|
|
NS_NewStorageStream(uint32_t aSegmentSize, uint32_t aMaxSize,
|
|
nsIStorageStream** aResult)
|
|
{
|
|
RefPtr<nsStorageStream> storageStream = new nsStorageStream();
|
|
nsresult rv = storageStream->Init(aSegmentSize, aMaxSize);
|
|
if (NS_FAILED(rv)) {
|
|
return rv;
|
|
}
|
|
storageStream.forget(aResult);
|
|
return NS_OK;
|
|
}
|
|
|
|
// Undefine LOG, so that other .cpp files (or their includes) won't complain
|
|
// about it already being defined, when we build in unified mode.
|
|
#undef LOG
|