mirror of
https://github.com/classilla/tenfourfox.git
synced 2024-09-11 02:56:06 +00:00
820 lines
23 KiB
C++
820 lines
23 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
|
|
/* 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/. */
|
|
|
|
#include "ipc/IPCMessageUtils.h"
|
|
|
|
#include "nsBufferedStreams.h"
|
|
#include "nsStreamUtils.h"
|
|
#include "nsNetCID.h"
|
|
#include "nsIClassInfoImpl.h"
|
|
#include "mozilla/ipc/InputStreamUtils.h"
|
|
#include <algorithm>
|
|
|
|
#ifdef DEBUG_brendan
|
|
# define METERING
|
|
#endif
|
|
|
|
#ifdef METERING
|
|
# include <stdio.h>
|
|
# define METER(x) x
|
|
# define MAX_BIG_SEEKS 20
|
|
|
|
static struct {
|
|
uint32_t mSeeksWithinBuffer;
|
|
uint32_t mSeeksOutsideBuffer;
|
|
uint32_t mBufferReadUponSeek;
|
|
uint32_t mBufferUnreadUponSeek;
|
|
uint32_t mBytesReadFromBuffer;
|
|
uint32_t mBigSeekIndex;
|
|
struct {
|
|
int64_t mOldOffset;
|
|
int64_t mNewOffset;
|
|
} mBigSeek[MAX_BIG_SEEKS];
|
|
} bufstats;
|
|
#else
|
|
# define METER(x) /* nothing */
|
|
#endif
|
|
|
|
using namespace mozilla::ipc;
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// nsBufferedStream
|
|
|
|
nsBufferedStream::nsBufferedStream()
|
|
: mBuffer(nullptr),
|
|
mBufferStartOffset(0),
|
|
mCursor(0),
|
|
mFillPoint(0),
|
|
mStream(nullptr),
|
|
mBufferDisabled(false),
|
|
mEOF(false),
|
|
mGetBufferCount(0)
|
|
{
|
|
}
|
|
|
|
nsBufferedStream::~nsBufferedStream()
|
|
{
|
|
Close();
|
|
}
|
|
|
|
NS_IMPL_ISUPPORTS(nsBufferedStream, nsISeekableStream)
|
|
|
|
nsresult
|
|
nsBufferedStream::Init(nsISupports* stream, uint32_t bufferSize)
|
|
{
|
|
NS_ASSERTION(stream, "need to supply a stream");
|
|
NS_ASSERTION(mStream == nullptr, "already inited");
|
|
mStream = stream;
|
|
NS_IF_ADDREF(mStream);
|
|
mBufferSize = bufferSize;
|
|
mBufferStartOffset = 0;
|
|
mCursor = 0;
|
|
mBuffer = new (mozilla::fallible) char[bufferSize];
|
|
if (mBuffer == nullptr)
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
return NS_OK;
|
|
}
|
|
|
|
nsresult
|
|
nsBufferedStream::Close()
|
|
{
|
|
NS_IF_RELEASE(mStream);
|
|
if (mBuffer) {
|
|
delete[] mBuffer;
|
|
mBuffer = nullptr;
|
|
mBufferSize = 0;
|
|
mBufferStartOffset = 0;
|
|
mCursor = 0;
|
|
mFillPoint = 0;
|
|
}
|
|
#ifdef METERING
|
|
{
|
|
static FILE *tfp;
|
|
if (!tfp) {
|
|
tfp = fopen("/tmp/bufstats", "w");
|
|
if (tfp)
|
|
setvbuf(tfp, nullptr, _IOLBF, 0);
|
|
}
|
|
if (tfp) {
|
|
fprintf(tfp, "seeks within buffer: %u\n",
|
|
bufstats.mSeeksWithinBuffer);
|
|
fprintf(tfp, "seeks outside buffer: %u\n",
|
|
bufstats.mSeeksOutsideBuffer);
|
|
fprintf(tfp, "buffer read on seek: %u\n",
|
|
bufstats.mBufferReadUponSeek);
|
|
fprintf(tfp, "buffer unread on seek: %u\n",
|
|
bufstats.mBufferUnreadUponSeek);
|
|
fprintf(tfp, "bytes read from buffer: %u\n",
|
|
bufstats.mBytesReadFromBuffer);
|
|
for (uint32_t i = 0; i < bufstats.mBigSeekIndex; i++) {
|
|
fprintf(tfp, "bigseek[%u] = {old: %u, new: %u}\n",
|
|
i,
|
|
bufstats.mBigSeek[i].mOldOffset,
|
|
bufstats.mBigSeek[i].mNewOffset);
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsBufferedStream::Seek(int32_t whence, int64_t offset)
|
|
{
|
|
if (mStream == nullptr)
|
|
return NS_BASE_STREAM_CLOSED;
|
|
|
|
// If the underlying stream isn't a random access store, then fail early.
|
|
// We could possibly succeed for the case where the seek position denotes
|
|
// something that happens to be read into the buffer, but that would make
|
|
// the failure data-dependent.
|
|
nsresult rv;
|
|
nsCOMPtr<nsISeekableStream> ras = do_QueryInterface(mStream, &rv);
|
|
if (NS_FAILED(rv)) return rv;
|
|
|
|
int64_t absPos = 0;
|
|
switch (whence) {
|
|
case nsISeekableStream::NS_SEEK_SET:
|
|
absPos = offset;
|
|
break;
|
|
case nsISeekableStream::NS_SEEK_CUR:
|
|
absPos = mBufferStartOffset;
|
|
absPos += mCursor;
|
|
absPos += offset;
|
|
break;
|
|
case nsISeekableStream::NS_SEEK_END:
|
|
absPos = -1;
|
|
break;
|
|
default:
|
|
NS_NOTREACHED("bogus seek whence parameter");
|
|
return NS_ERROR_UNEXPECTED;
|
|
}
|
|
|
|
// Let mCursor point into the existing buffer if the new position is
|
|
// between the current cursor and the mFillPoint "fencepost" -- the
|
|
// client may never get around to a Read or Write after this Seek.
|
|
// Read and Write worry about flushing and filling in that event.
|
|
// But if we're at EOF, make sure to pass the seek through to the
|
|
// underlying stream, because it may have auto-closed itself and
|
|
// needs to reopen.
|
|
uint32_t offsetInBuffer = uint32_t(absPos - mBufferStartOffset);
|
|
if (offsetInBuffer <= mFillPoint && !mEOF) {
|
|
METER(bufstats.mSeeksWithinBuffer++);
|
|
mCursor = offsetInBuffer;
|
|
return NS_OK;
|
|
}
|
|
|
|
METER(bufstats.mSeeksOutsideBuffer++);
|
|
METER(bufstats.mBufferReadUponSeek += mCursor);
|
|
METER(bufstats.mBufferUnreadUponSeek += mFillPoint - mCursor);
|
|
rv = Flush();
|
|
if (NS_FAILED(rv)) return rv;
|
|
|
|
rv = ras->Seek(whence, offset);
|
|
if (NS_FAILED(rv)) return rv;
|
|
|
|
mEOF = false;
|
|
|
|
// Recompute whether the offset we're seeking to is in our buffer.
|
|
// Note that we need to recompute because Flush() might have
|
|
// changed mBufferStartOffset.
|
|
offsetInBuffer = uint32_t(absPos - mBufferStartOffset);
|
|
if (offsetInBuffer <= mFillPoint) {
|
|
// It's safe to just set mCursor to offsetInBuffer. In particular, we
|
|
// want to avoid calling Fill() here since we already have the data that
|
|
// was seeked to and calling Fill() might auto-close our underlying
|
|
// stream in some cases.
|
|
mCursor = offsetInBuffer;
|
|
return NS_OK;
|
|
}
|
|
|
|
METER(if (bufstats.mBigSeekIndex < MAX_BIG_SEEKS)
|
|
bufstats.mBigSeek[bufstats.mBigSeekIndex].mOldOffset =
|
|
mBufferStartOffset + int64_t(mCursor));
|
|
const int64_t minus1 = -1;
|
|
if (absPos == minus1) {
|
|
// then we had the SEEK_END case, above
|
|
int64_t tellPos;
|
|
rv = ras->Tell(&tellPos);
|
|
mBufferStartOffset = tellPos;
|
|
if (NS_FAILED(rv)) return rv;
|
|
}
|
|
else {
|
|
mBufferStartOffset = absPos;
|
|
}
|
|
METER(if (bufstats.mBigSeekIndex < MAX_BIG_SEEKS)
|
|
bufstats.mBigSeek[bufstats.mBigSeekIndex++].mNewOffset =
|
|
mBufferStartOffset);
|
|
|
|
mFillPoint = mCursor = 0;
|
|
return Fill();
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsBufferedStream::Tell(int64_t *result)
|
|
{
|
|
if (mStream == nullptr)
|
|
return NS_BASE_STREAM_CLOSED;
|
|
|
|
int64_t result64 = mBufferStartOffset;
|
|
result64 += mCursor;
|
|
*result = result64;
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsBufferedStream::SetEOF()
|
|
{
|
|
if (mStream == nullptr)
|
|
return NS_BASE_STREAM_CLOSED;
|
|
|
|
nsresult rv;
|
|
nsCOMPtr<nsISeekableStream> ras = do_QueryInterface(mStream, &rv);
|
|
if (NS_FAILED(rv)) return rv;
|
|
|
|
rv = ras->SetEOF();
|
|
if (NS_SUCCEEDED(rv))
|
|
mEOF = true;
|
|
return rv;
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// nsBufferedInputStream
|
|
|
|
NS_IMPL_ADDREF_INHERITED(nsBufferedInputStream, nsBufferedStream)
|
|
NS_IMPL_RELEASE_INHERITED(nsBufferedInputStream, nsBufferedStream)
|
|
|
|
NS_IMPL_CLASSINFO(nsBufferedInputStream, nullptr, nsIClassInfo::THREADSAFE,
|
|
NS_BUFFEREDINPUTSTREAM_CID)
|
|
|
|
NS_INTERFACE_MAP_BEGIN(nsBufferedInputStream)
|
|
NS_INTERFACE_MAP_ENTRY(nsIInputStream)
|
|
NS_INTERFACE_MAP_ENTRY(nsIBufferedInputStream)
|
|
NS_INTERFACE_MAP_ENTRY(nsIStreamBufferAccess)
|
|
NS_INTERFACE_MAP_ENTRY(nsIIPCSerializableInputStream)
|
|
NS_IMPL_QUERY_CLASSINFO(nsBufferedInputStream)
|
|
NS_INTERFACE_MAP_END_INHERITING(nsBufferedStream)
|
|
|
|
NS_IMPL_CI_INTERFACE_GETTER(nsBufferedInputStream,
|
|
nsIInputStream,
|
|
nsIBufferedInputStream,
|
|
nsISeekableStream,
|
|
nsIStreamBufferAccess)
|
|
|
|
nsresult
|
|
nsBufferedInputStream::Create(nsISupports *aOuter, REFNSIID aIID, void **aResult)
|
|
{
|
|
NS_ENSURE_NO_AGGREGATION(aOuter);
|
|
|
|
nsBufferedInputStream* stream = new nsBufferedInputStream();
|
|
if (stream == nullptr)
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
NS_ADDREF(stream);
|
|
nsresult rv = stream->QueryInterface(aIID, aResult);
|
|
NS_RELEASE(stream);
|
|
return rv;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsBufferedInputStream::Init(nsIInputStream* stream, uint32_t bufferSize)
|
|
{
|
|
return nsBufferedStream::Init(stream, bufferSize);
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsBufferedInputStream::Close()
|
|
{
|
|
nsresult rv1 = NS_OK, rv2;
|
|
if (mStream) {
|
|
rv1 = Source()->Close();
|
|
NS_RELEASE(mStream);
|
|
}
|
|
rv2 = nsBufferedStream::Close();
|
|
if (NS_FAILED(rv1)) return rv1;
|
|
return rv2;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsBufferedInputStream::Available(uint64_t *result)
|
|
{
|
|
nsresult rv = NS_OK;
|
|
*result = 0;
|
|
if (mStream) {
|
|
rv = Source()->Available(result);
|
|
}
|
|
*result += (mFillPoint - mCursor);
|
|
return rv;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsBufferedInputStream::Read(char * buf, uint32_t count, uint32_t *result)
|
|
{
|
|
if (mBufferDisabled) {
|
|
if (!mStream) {
|
|
*result = 0;
|
|
return NS_OK;
|
|
}
|
|
nsresult rv = Source()->Read(buf, count, result);
|
|
if (NS_SUCCEEDED(rv)) {
|
|
mBufferStartOffset += *result; // so nsBufferedStream::Tell works
|
|
if (*result == 0) {
|
|
mEOF = true;
|
|
}
|
|
}
|
|
return rv;
|
|
}
|
|
|
|
return ReadSegments(NS_CopySegmentToBuffer, buf, count, result);
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsBufferedInputStream::ReadSegments(nsWriteSegmentFun writer, void *closure,
|
|
uint32_t count, uint32_t *result)
|
|
{
|
|
*result = 0;
|
|
|
|
if (!mStream)
|
|
return NS_OK;
|
|
|
|
nsresult rv = NS_OK;
|
|
while (count > 0) {
|
|
uint32_t amt = std::min(count, mFillPoint - mCursor);
|
|
if (amt > 0) {
|
|
uint32_t read = 0;
|
|
rv = writer(this, closure, mBuffer + mCursor, *result, amt, &read);
|
|
if (NS_FAILED(rv)) {
|
|
// errors returned from the writer end here!
|
|
rv = NS_OK;
|
|
break;
|
|
}
|
|
*result += read;
|
|
count -= read;
|
|
mCursor += read;
|
|
}
|
|
else {
|
|
rv = Fill();
|
|
if (NS_FAILED(rv) || mFillPoint == mCursor)
|
|
break;
|
|
}
|
|
}
|
|
return (*result > 0) ? NS_OK : rv;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsBufferedInputStream::IsNonBlocking(bool *aNonBlocking)
|
|
{
|
|
if (mStream)
|
|
return Source()->IsNonBlocking(aNonBlocking);
|
|
return NS_ERROR_NOT_INITIALIZED;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsBufferedInputStream::Fill()
|
|
{
|
|
if (mBufferDisabled)
|
|
return NS_OK;
|
|
NS_ENSURE_TRUE(mStream, NS_ERROR_NOT_INITIALIZED);
|
|
|
|
nsresult rv;
|
|
int32_t rem = int32_t(mFillPoint - mCursor);
|
|
if (rem > 0) {
|
|
// slide the remainder down to the start of the buffer
|
|
// |<------------->|<--rem-->|<--->|
|
|
// b c f s
|
|
memcpy(mBuffer, mBuffer + mCursor, rem);
|
|
}
|
|
mBufferStartOffset += mCursor;
|
|
mFillPoint = rem;
|
|
mCursor = 0;
|
|
|
|
uint32_t amt;
|
|
rv = Source()->Read(mBuffer + mFillPoint, mBufferSize - mFillPoint, &amt);
|
|
if (NS_FAILED(rv)) return rv;
|
|
|
|
if (amt == 0)
|
|
mEOF = true;
|
|
|
|
mFillPoint += amt;
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP_(char*)
|
|
nsBufferedInputStream::GetBuffer(uint32_t aLength, uint32_t aAlignMask)
|
|
{
|
|
NS_ASSERTION(mGetBufferCount == 0, "nested GetBuffer!");
|
|
if (mGetBufferCount != 0)
|
|
return nullptr;
|
|
|
|
if (mBufferDisabled)
|
|
return nullptr;
|
|
|
|
char* buf = mBuffer + mCursor;
|
|
uint32_t rem = mFillPoint - mCursor;
|
|
if (rem == 0) {
|
|
if (NS_FAILED(Fill()))
|
|
return nullptr;
|
|
buf = mBuffer + mCursor;
|
|
rem = mFillPoint - mCursor;
|
|
}
|
|
|
|
uint32_t mod = (NS_PTR_TO_INT32(buf) & aAlignMask);
|
|
if (mod) {
|
|
uint32_t pad = aAlignMask + 1 - mod;
|
|
if (pad > rem)
|
|
return nullptr;
|
|
|
|
memset(buf, 0, pad);
|
|
mCursor += pad;
|
|
buf += pad;
|
|
rem -= pad;
|
|
}
|
|
|
|
if (aLength > rem)
|
|
return nullptr;
|
|
mGetBufferCount++;
|
|
return buf;
|
|
}
|
|
|
|
NS_IMETHODIMP_(void)
|
|
nsBufferedInputStream::PutBuffer(char* aBuffer, uint32_t aLength)
|
|
{
|
|
NS_ASSERTION(mGetBufferCount == 1, "stray PutBuffer!");
|
|
if (--mGetBufferCount != 0)
|
|
return;
|
|
|
|
NS_ASSERTION(mCursor + aLength <= mFillPoint, "PutBuffer botch");
|
|
mCursor += aLength;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsBufferedInputStream::DisableBuffering()
|
|
{
|
|
NS_ASSERTION(!mBufferDisabled, "redundant call to DisableBuffering!");
|
|
NS_ASSERTION(mGetBufferCount == 0,
|
|
"DisableBuffer call between GetBuffer and PutBuffer!");
|
|
if (mGetBufferCount != 0)
|
|
return NS_ERROR_UNEXPECTED;
|
|
|
|
// Empty the buffer so nsBufferedStream::Tell works.
|
|
mBufferStartOffset += mCursor;
|
|
mFillPoint = mCursor = 0;
|
|
mBufferDisabled = true;
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsBufferedInputStream::EnableBuffering()
|
|
{
|
|
NS_ASSERTION(mBufferDisabled, "gratuitous call to EnableBuffering!");
|
|
mBufferDisabled = false;
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsBufferedInputStream::GetUnbufferedStream(nsISupports* *aStream)
|
|
{
|
|
// Empty the buffer so subsequent i/o trumps any buffered data.
|
|
mBufferStartOffset += mCursor;
|
|
mFillPoint = mCursor = 0;
|
|
|
|
*aStream = mStream;
|
|
NS_IF_ADDREF(*aStream);
|
|
return NS_OK;
|
|
}
|
|
|
|
void
|
|
nsBufferedInputStream::Serialize(InputStreamParams& aParams,
|
|
FileDescriptorArray& aFileDescriptors)
|
|
{
|
|
BufferedInputStreamParams params;
|
|
|
|
if (mStream) {
|
|
nsCOMPtr<nsIInputStream> stream = do_QueryInterface(mStream);
|
|
MOZ_ASSERT(stream);
|
|
|
|
InputStreamParams wrappedParams;
|
|
SerializeInputStream(stream, wrappedParams, aFileDescriptors);
|
|
|
|
params.optionalStream() = wrappedParams;
|
|
}
|
|
else {
|
|
params.optionalStream() = mozilla::void_t();
|
|
}
|
|
|
|
params.bufferSize() = mBufferSize;
|
|
|
|
aParams = params;
|
|
}
|
|
|
|
bool
|
|
nsBufferedInputStream::Deserialize(const InputStreamParams& aParams,
|
|
const FileDescriptorArray& aFileDescriptors)
|
|
{
|
|
if (aParams.type() != InputStreamParams::TBufferedInputStreamParams) {
|
|
NS_ERROR("Received unknown parameters from the other process!");
|
|
return false;
|
|
}
|
|
|
|
const BufferedInputStreamParams& params =
|
|
aParams.get_BufferedInputStreamParams();
|
|
const OptionalInputStreamParams& wrappedParams = params.optionalStream();
|
|
|
|
nsCOMPtr<nsIInputStream> stream;
|
|
if (wrappedParams.type() == OptionalInputStreamParams::TInputStreamParams) {
|
|
stream = DeserializeInputStream(wrappedParams.get_InputStreamParams(),
|
|
aFileDescriptors);
|
|
if (!stream) {
|
|
NS_WARNING("Failed to deserialize wrapped stream!");
|
|
return false;
|
|
}
|
|
}
|
|
else {
|
|
NS_ASSERTION(wrappedParams.type() == OptionalInputStreamParams::Tvoid_t,
|
|
"Unknown type for OptionalInputStreamParams!");
|
|
}
|
|
|
|
nsresult rv = Init(stream, params.bufferSize());
|
|
NS_ENSURE_SUCCESS(rv, false);
|
|
|
|
return true;
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// nsBufferedOutputStream
|
|
|
|
NS_IMPL_ADDREF_INHERITED(nsBufferedOutputStream, nsBufferedStream)
|
|
NS_IMPL_RELEASE_INHERITED(nsBufferedOutputStream, nsBufferedStream)
|
|
// This QI uses NS_INTERFACE_MAP_ENTRY_CONDITIONAL to check for
|
|
// non-nullness of mSafeStream.
|
|
NS_INTERFACE_MAP_BEGIN(nsBufferedOutputStream)
|
|
NS_INTERFACE_MAP_ENTRY(nsIOutputStream)
|
|
NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsISafeOutputStream, mSafeStream)
|
|
NS_INTERFACE_MAP_ENTRY(nsIBufferedOutputStream)
|
|
NS_INTERFACE_MAP_ENTRY(nsIStreamBufferAccess)
|
|
NS_INTERFACE_MAP_END_INHERITING(nsBufferedStream)
|
|
|
|
nsresult
|
|
nsBufferedOutputStream::Create(nsISupports *aOuter, REFNSIID aIID, void **aResult)
|
|
{
|
|
NS_ENSURE_NO_AGGREGATION(aOuter);
|
|
|
|
nsBufferedOutputStream* stream = new nsBufferedOutputStream();
|
|
if (stream == nullptr)
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
NS_ADDREF(stream);
|
|
nsresult rv = stream->QueryInterface(aIID, aResult);
|
|
NS_RELEASE(stream);
|
|
return rv;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsBufferedOutputStream::Init(nsIOutputStream* stream, uint32_t bufferSize)
|
|
{
|
|
// QI stream to an nsISafeOutputStream, to see if we should support it
|
|
mSafeStream = do_QueryInterface(stream);
|
|
|
|
return nsBufferedStream::Init(stream, bufferSize);
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsBufferedOutputStream::Close()
|
|
{
|
|
nsresult rv1, rv2 = NS_OK, rv3;
|
|
rv1 = Flush();
|
|
// If we fail to Flush all the data, then we close anyway and drop the
|
|
// remaining data in the buffer. We do this because it's what Unix does
|
|
// for fclose and close. However, we report the error from Flush anyway.
|
|
if (mStream) {
|
|
rv2 = Sink()->Close();
|
|
NS_RELEASE(mStream);
|
|
}
|
|
rv3 = nsBufferedStream::Close();
|
|
if (NS_FAILED(rv1)) return rv1;
|
|
if (NS_FAILED(rv2)) return rv2;
|
|
return rv3;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsBufferedOutputStream::Write(const char *buf, uint32_t count, uint32_t *result)
|
|
{
|
|
nsresult rv = NS_OK;
|
|
uint32_t written = 0;
|
|
while (count > 0) {
|
|
uint32_t amt = std::min(count, mBufferSize - mCursor);
|
|
if (amt > 0) {
|
|
memcpy(mBuffer + mCursor, buf + written, amt);
|
|
written += amt;
|
|
count -= amt;
|
|
mCursor += amt;
|
|
if (mFillPoint < mCursor)
|
|
mFillPoint = mCursor;
|
|
}
|
|
else {
|
|
NS_ASSERTION(mFillPoint, "iloop in nsBufferedOutputStream::Write!");
|
|
rv = Flush();
|
|
if (NS_FAILED(rv)) break;
|
|
}
|
|
}
|
|
*result = written;
|
|
return (written > 0) ? NS_OK : rv;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsBufferedOutputStream::Flush()
|
|
{
|
|
nsresult rv;
|
|
uint32_t amt;
|
|
if (!mStream) {
|
|
// Stream already cancelled/flushed; probably because of previous error.
|
|
return NS_OK;
|
|
}
|
|
rv = Sink()->Write(mBuffer, mFillPoint, &amt);
|
|
if (NS_FAILED(rv)) return rv;
|
|
mBufferStartOffset += amt;
|
|
if (amt == mFillPoint) {
|
|
mFillPoint = mCursor = 0;
|
|
return NS_OK; // flushed everything
|
|
}
|
|
|
|
// slide the remainder down to the start of the buffer
|
|
// |<-------------->|<---|----->|
|
|
// b a c s
|
|
uint32_t rem = mFillPoint - amt;
|
|
memmove(mBuffer, mBuffer + amt, rem);
|
|
mFillPoint = mCursor = rem;
|
|
return NS_ERROR_FAILURE; // didn't flush all
|
|
}
|
|
|
|
// nsISafeOutputStream
|
|
NS_IMETHODIMP
|
|
nsBufferedOutputStream::Finish()
|
|
{
|
|
// flush the stream, to write out any buffered data...
|
|
nsresult rv = nsBufferedOutputStream::Flush();
|
|
if (NS_FAILED(rv))
|
|
NS_WARNING("failed to flush buffered data! possible dataloss");
|
|
|
|
// ... and finish the underlying stream...
|
|
if (NS_SUCCEEDED(rv))
|
|
rv = mSafeStream->Finish();
|
|
else
|
|
Sink()->Close();
|
|
|
|
// ... and close the buffered stream, so any further attempts to flush/close
|
|
// the buffered stream won't cause errors.
|
|
nsBufferedStream::Close();
|
|
|
|
return rv;
|
|
}
|
|
|
|
static NS_METHOD
|
|
nsReadFromInputStream(nsIOutputStream* outStr,
|
|
void* closure,
|
|
char* toRawSegment,
|
|
uint32_t offset,
|
|
uint32_t count,
|
|
uint32_t *readCount)
|
|
{
|
|
nsIInputStream* fromStream = (nsIInputStream*)closure;
|
|
return fromStream->Read(toRawSegment, count, readCount);
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsBufferedOutputStream::WriteFrom(nsIInputStream *inStr, uint32_t count, uint32_t *_retval)
|
|
{
|
|
return WriteSegments(nsReadFromInputStream, inStr, count, _retval);
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsBufferedOutputStream::WriteSegments(nsReadSegmentFun reader, void * closure, uint32_t count, uint32_t *_retval)
|
|
{
|
|
*_retval = 0;
|
|
nsresult rv;
|
|
while (count > 0) {
|
|
uint32_t left = std::min(count, mBufferSize - mCursor);
|
|
if (left == 0) {
|
|
rv = Flush();
|
|
if (NS_FAILED(rv))
|
|
return (*_retval > 0) ? NS_OK : rv;
|
|
|
|
continue;
|
|
}
|
|
|
|
uint32_t read = 0;
|
|
rv = reader(this, closure, mBuffer + mCursor, *_retval, left, &read);
|
|
|
|
if (NS_FAILED(rv)) // If we have written some data, return ok
|
|
return (*_retval > 0) ? NS_OK : rv;
|
|
mCursor += read;
|
|
*_retval += read;
|
|
count -= read;
|
|
mFillPoint = std::max(mFillPoint, mCursor);
|
|
}
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsBufferedOutputStream::IsNonBlocking(bool *aNonBlocking)
|
|
{
|
|
if (mStream)
|
|
return Sink()->IsNonBlocking(aNonBlocking);
|
|
return NS_ERROR_NOT_INITIALIZED;
|
|
}
|
|
|
|
NS_IMETHODIMP_(char*)
|
|
nsBufferedOutputStream::GetBuffer(uint32_t aLength, uint32_t aAlignMask)
|
|
{
|
|
NS_ASSERTION(mGetBufferCount == 0, "nested GetBuffer!");
|
|
if (mGetBufferCount != 0)
|
|
return nullptr;
|
|
|
|
if (mBufferDisabled)
|
|
return nullptr;
|
|
|
|
char* buf = mBuffer + mCursor;
|
|
uint32_t rem = mBufferSize - mCursor;
|
|
if (rem == 0) {
|
|
if (NS_FAILED(Flush()))
|
|
return nullptr;
|
|
buf = mBuffer + mCursor;
|
|
rem = mBufferSize - mCursor;
|
|
}
|
|
|
|
uint32_t mod = (NS_PTR_TO_INT32(buf) & aAlignMask);
|
|
if (mod) {
|
|
uint32_t pad = aAlignMask + 1 - mod;
|
|
if (pad > rem)
|
|
return nullptr;
|
|
|
|
memset(buf, 0, pad);
|
|
mCursor += pad;
|
|
buf += pad;
|
|
rem -= pad;
|
|
}
|
|
|
|
if (aLength > rem)
|
|
return nullptr;
|
|
mGetBufferCount++;
|
|
return buf;
|
|
}
|
|
|
|
NS_IMETHODIMP_(void)
|
|
nsBufferedOutputStream::PutBuffer(char* aBuffer, uint32_t aLength)
|
|
{
|
|
NS_ASSERTION(mGetBufferCount == 1, "stray PutBuffer!");
|
|
if (--mGetBufferCount != 0)
|
|
return;
|
|
|
|
NS_ASSERTION(mCursor + aLength <= mBufferSize, "PutBuffer botch");
|
|
mCursor += aLength;
|
|
if (mFillPoint < mCursor)
|
|
mFillPoint = mCursor;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsBufferedOutputStream::DisableBuffering()
|
|
{
|
|
NS_ASSERTION(!mBufferDisabled, "redundant call to DisableBuffering!");
|
|
NS_ASSERTION(mGetBufferCount == 0,
|
|
"DisableBuffer call between GetBuffer and PutBuffer!");
|
|
if (mGetBufferCount != 0)
|
|
return NS_ERROR_UNEXPECTED;
|
|
|
|
// Empty the buffer so nsBufferedStream::Tell works.
|
|
nsresult rv = Flush();
|
|
if (NS_FAILED(rv))
|
|
return rv;
|
|
|
|
mBufferDisabled = true;
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsBufferedOutputStream::EnableBuffering()
|
|
{
|
|
NS_ASSERTION(mBufferDisabled, "gratuitous call to EnableBuffering!");
|
|
mBufferDisabled = false;
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsBufferedOutputStream::GetUnbufferedStream(nsISupports* *aStream)
|
|
{
|
|
// Empty the buffer so subsequent i/o trumps any buffered data.
|
|
if (mFillPoint) {
|
|
nsresult rv = Flush();
|
|
if (NS_FAILED(rv))
|
|
return rv;
|
|
}
|
|
|
|
*aStream = mStream;
|
|
NS_IF_ADDREF(*aStream);
|
|
return NS_OK;
|
|
}
|
|
|
|
#undef METER
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|