зеркало из https://github.com/mozilla/gecko-dev.git
401 строка
9.3 KiB
C++
401 строка
9.3 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* vim:set ts=4 sts=4 sw=4 cin et: */
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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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* Based on original code from nsIStringStream.cpp
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*/
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#include "IPC/IPCMessageUtils.h"
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#include "nsStringStream.h"
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#include "nsStreamUtils.h"
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#include "nsReadableUtils.h"
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#include "nsISeekableStream.h"
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#include "nsISupportsPrimitives.h"
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#include "nsCRT.h"
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#include "prerror.h"
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#include "plstr.h"
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#include "nsIClassInfoImpl.h"
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#include "nsIIPCSerializable.h"
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#include "mozilla/Attributes.h"
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//-----------------------------------------------------------------------------
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// nsIStringInputStream implementation
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//-----------------------------------------------------------------------------
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class nsStringInputStream MOZ_FINAL : public nsIStringInputStream
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, public nsISeekableStream
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, public nsISupportsCString
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, public nsIIPCSerializable
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{
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public:
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NS_DECL_ISUPPORTS
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NS_DECL_NSIINPUTSTREAM
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NS_DECL_NSISTRINGINPUTSTREAM
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NS_DECL_NSISEEKABLESTREAM
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NS_DECL_NSISUPPORTSPRIMITIVE
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NS_DECL_NSISUPPORTSCSTRING
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NS_DECL_NSIIPCSERIALIZABLE
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nsStringInputStream()
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{
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Clear();
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}
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private:
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~nsStringInputStream()
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{}
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PRUint32 Length() const
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{
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return mData.Length();
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}
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PRUint32 LengthRemaining() const
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{
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return Length() - mOffset;
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}
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void Clear()
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{
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mData.SetIsVoid(true);
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}
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bool Closed()
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{
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return mData.IsVoid();
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}
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nsDependentCSubstring mData;
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PRUint32 mOffset;
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};
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// This class needs to support threadsafe refcounting since people often
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// allocate a string stream, and then read it from a background thread.
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NS_IMPL_THREADSAFE_ADDREF(nsStringInputStream)
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NS_IMPL_THREADSAFE_RELEASE(nsStringInputStream)
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NS_IMPL_CLASSINFO(nsStringInputStream, NULL, nsIClassInfo::THREADSAFE,
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NS_STRINGINPUTSTREAM_CID)
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NS_IMPL_QUERY_INTERFACE5_CI(nsStringInputStream,
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nsIStringInputStream,
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nsIInputStream,
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nsISupportsCString,
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nsISeekableStream,
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nsIIPCSerializable)
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NS_IMPL_CI_INTERFACE_GETTER5(nsStringInputStream,
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nsIStringInputStream,
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nsIInputStream,
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nsISupportsCString,
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nsISeekableStream,
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nsIIPCSerializable)
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/////////
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// nsISupportsCString implementation
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/////////
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NS_IMETHODIMP
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nsStringInputStream::GetType(PRUint16 *type)
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{
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*type = TYPE_CSTRING;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStringInputStream::GetData(nsACString &data)
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{
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// The stream doesn't have any data when it is closed. We could fake it
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// and return an empty string here, but it seems better to keep this return
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// value consistent with the behavior of the other 'getter' methods.
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NS_ENSURE_TRUE(!Closed(), NS_BASE_STREAM_CLOSED);
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data.Assign(mData);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStringInputStream::SetData(const nsACString &data)
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{
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mData.Assign(data);
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mOffset = 0;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStringInputStream::ToString(char **result)
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{
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// NOTE: This method may result in data loss, so we do not implement it.
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return NS_ERROR_NOT_IMPLEMENTED;
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}
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/////////
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// nsIStringInputStream implementation
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/////////
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NS_IMETHODIMP
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nsStringInputStream::SetData(const char *data, PRInt32 dataLen)
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{
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NS_ENSURE_ARG_POINTER(data);
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mData.Assign(data, dataLen);
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mOffset = 0;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStringInputStream::AdoptData(char *data, PRInt32 dataLen)
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{
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NS_ENSURE_ARG_POINTER(data);
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mData.Adopt(data, dataLen);
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mOffset = 0;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStringInputStream::ShareData(const char *data, PRInt32 dataLen)
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{
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NS_ENSURE_ARG_POINTER(data);
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if (dataLen < 0)
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dataLen = strlen(data);
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mData.Rebind(data, dataLen);
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mOffset = 0;
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return NS_OK;
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}
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/////////
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// nsIInputStream implementation
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/////////
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NS_IMETHODIMP
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nsStringInputStream::Close()
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{
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Clear();
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStringInputStream::Available(PRUint32 *aLength)
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{
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NS_ASSERTION(aLength, "null ptr");
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if (Closed())
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return NS_BASE_STREAM_CLOSED;
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*aLength = LengthRemaining();
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStringInputStream::Read(char* aBuf, PRUint32 aCount, PRUint32 *aReadCount)
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{
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NS_ASSERTION(aBuf, "null ptr");
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return ReadSegments(NS_CopySegmentToBuffer, aBuf, aCount, aReadCount);
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}
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NS_IMETHODIMP
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nsStringInputStream::ReadSegments(nsWriteSegmentFun writer, void *closure,
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PRUint32 aCount, PRUint32 *result)
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{
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NS_ASSERTION(result, "null ptr");
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NS_ASSERTION(Length() >= mOffset, "bad stream state");
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if (Closed())
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return NS_BASE_STREAM_CLOSED;
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// We may be at end-of-file
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PRUint32 maxCount = LengthRemaining();
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if (maxCount == 0) {
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*result = 0;
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return NS_OK;
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}
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if (aCount > maxCount)
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aCount = maxCount;
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nsresult rv = writer(this, closure, mData.BeginReading() + mOffset, 0, aCount, result);
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if (NS_SUCCEEDED(rv)) {
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NS_ASSERTION(*result <= aCount,
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"writer should not write more than we asked it to write");
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mOffset += *result;
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}
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// errors returned from the writer end here!
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStringInputStream::IsNonBlocking(bool *aNonBlocking)
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{
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*aNonBlocking = true;
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return NS_OK;
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}
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/////////
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// nsISeekableStream implementation
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/////////
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NS_IMETHODIMP
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nsStringInputStream::Seek(PRInt32 whence, PRInt64 offset)
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{
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if (Closed())
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return NS_BASE_STREAM_CLOSED;
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// Compute new stream position. The given offset may be a negative value.
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PRInt64 newPos = offset;
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switch (whence) {
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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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newPos += mOffset;
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break;
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case NS_SEEK_END:
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newPos += Length();
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break;
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default:
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NS_ERROR("invalid whence");
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return NS_ERROR_INVALID_ARG;
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}
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NS_ENSURE_ARG(newPos >= 0);
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NS_ENSURE_ARG(newPos <= Length());
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mOffset = (PRUint32)newPos;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStringInputStream::Tell(PRInt64* outWhere)
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{
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if (Closed())
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return NS_BASE_STREAM_CLOSED;
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*outWhere = mOffset;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStringInputStream::SetEOF()
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{
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if (Closed())
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return NS_BASE_STREAM_CLOSED;
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mOffset = Length();
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return NS_OK;
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}
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/////////
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// nsIIPCSerializable implementation
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/////////
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bool
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nsStringInputStream::Read(const IPC::Message *aMsg, void **aIter)
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{
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using IPC::ReadParam;
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nsCString value;
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if (!ReadParam(aMsg, aIter, &value))
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return false;
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nsresult rv = SetData(value);
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if (NS_FAILED(rv))
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return false;
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return true;
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}
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void
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nsStringInputStream::Write(IPC::Message *aMsg)
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{
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using IPC::WriteParam;
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WriteParam(aMsg, static_cast<const nsCString&>(PromiseFlatCString(mData)));
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}
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nsresult
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NS_NewByteInputStream(nsIInputStream** aStreamResult,
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const char* aStringToRead, PRInt32 aLength,
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nsAssignmentType aAssignment)
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{
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NS_PRECONDITION(aStreamResult, "null out ptr");
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nsStringInputStream* stream = new nsStringInputStream();
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if (! stream)
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return NS_ERROR_OUT_OF_MEMORY;
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NS_ADDREF(stream);
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nsresult rv;
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switch (aAssignment) {
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case NS_ASSIGNMENT_COPY:
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rv = stream->SetData(aStringToRead, aLength);
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break;
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case NS_ASSIGNMENT_DEPEND:
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rv = stream->ShareData(aStringToRead, aLength);
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break;
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case NS_ASSIGNMENT_ADOPT:
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rv = stream->AdoptData(const_cast<char*>(aStringToRead), aLength);
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break;
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default:
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NS_ERROR("invalid assignment type");
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rv = NS_ERROR_INVALID_ARG;
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}
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if (NS_FAILED(rv)) {
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NS_RELEASE(stream);
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return rv;
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}
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*aStreamResult = stream;
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return NS_OK;
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}
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nsresult
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NS_NewStringInputStream(nsIInputStream** aStreamResult,
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const nsAString& aStringToRead)
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{
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NS_LossyConvertUTF16toASCII data(aStringToRead); // truncates high-order bytes
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return NS_NewCStringInputStream(aStreamResult, data);
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}
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nsresult
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NS_NewCStringInputStream(nsIInputStream** aStreamResult,
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const nsACString& aStringToRead)
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{
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NS_PRECONDITION(aStreamResult, "null out ptr");
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nsStringInputStream* stream = new nsStringInputStream();
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if (! stream)
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return NS_ERROR_OUT_OF_MEMORY;
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NS_ADDREF(stream);
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stream->SetData(aStringToRead);
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*aStreamResult = stream;
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return NS_OK;
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}
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// factory method for constructing a nsStringInputStream object
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nsresult
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nsStringInputStreamConstructor(nsISupports *outer, REFNSIID iid, void **result)
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{
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*result = nullptr;
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NS_ENSURE_TRUE(!outer, NS_ERROR_NO_AGGREGATION);
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nsStringInputStream *inst = new nsStringInputStream();
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if (!inst)
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return NS_ERROR_OUT_OF_MEMORY;
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NS_ADDREF(inst);
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nsresult rv = inst->QueryInterface(iid, result);
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NS_RELEASE(inst);
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return rv;
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}
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