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Mozilla/mozilla/xpcom/io/nsFileStream.h
alecf%netscape.com eb193c5571 fix bug 149102 - stop exporting some old unused methods from XPCOM, and get rid of nsOutputConsoleStream and consumers 
also removing FilesTest from the build because its outdated, doesn't test anything useful anymore, and is the last consumer of nsOutputConsoleStream
r=dougt, sr=jag


git-svn-id: svn://10.0.0.236/trunk@123713 18797224-902f-48f8-a5cc-f745e15eee43
2002-06-20 20:35:37 +00:00

810 lines
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: NPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Netscape Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/NPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the NPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the NPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
// First checked in on 98/11/20 by John R. McMullen in the wrong directory.
// Checked in again 98/12/04.
// Polished version 98/12/08.
// Completely rewritten to integrate with nsIInputStream and nsIOutputStream (the
// xpcom stream objects.
//========================================================================================
//
// Classes defined:
//
// nsInputStream, nsOutputStream
// These are the lightweight STATICALLY LINKED wrappers for
// the xpcom objects nsIInputStream and nsIOutputstream.
// Possible uses:
// If you are implementing a function that accepts one of these xpcom
// streams, just make one of these little jobbies on the stack, and
// the handy << or >> notation can be yours.
//
// nsInputFileStream, nsOutputFileStream
// These are the STATICALLY LINKED wrappers for the file-related
// versions of the above.
// nsIOFileStream
// An input and output file stream attached to the same file.
//
// This suite provide the following services:
//
// 1. Encapsulates all platform-specific file details, so that file i/o
// can be done correctly without any platform #ifdefs
//
// 2. Uses NSPR file services (NOT ansi file I/O), in order to get best
// native performance. This performance difference is especially large on
// macintosh.
//
// 3. Allows all the power of the ansi stream syntax.
//
// Basic example:
//
// nsFileSpec myPath("/Development/iotest.txt");
//
// nsOutputFileStream testStream(myPath);
// testStream << "Hello World" << nsEndl;
//
// 4. Requires streams to be constructed using typesafe nsFileSpec specifier
// (not the notorious and bug prone const char*), namely nsFileSpec. See
// nsFileSpec.h for more details.
//
// 5. Fixes a bug that have been there for a long time, and
// is inevitable if you use NSPR alone:
//
// The problem on platforms (Macintosh) in which a path does not fully
// specify a file, because two volumes can have the same name.
//
// Not yet provided:
//
// Endian-awareness for reading and writing crossplatform binary files. At this
// time there seems to be no demand for this.
//
//========================================================================================
#ifndef _FILESTREAM_H_
#define _FILESTREAM_H_
#include "nscore.h"
#ifdef XP_MAC
#include "pprio.h" // To get PR_ImportFile
#else
#include "prio.h"
#endif
#include "nsCOMPtr.h"
#include "nsIFileStream.h"
// Defined elsewhere
class nsFileSpec;
class nsString;
class nsIInputStream;
class nsIOutputStream;
class nsIFileSpec;
//========================================================================================
// Compiler-specific macros, as needed
//========================================================================================
#if !defined(NS_USING_NAMESPACE) && (defined(__MWERKS__) || defined(XP_WIN))
#define NS_USING_NAMESPACE
#endif
#if !defined(NS_USING_STL) && (defined(__MWERKS__) || defined(XP_WIN))
#define NS_USING_STL
#endif
#ifdef NS_USING_NAMESPACE
#define NS_NAMESPACE_PROTOTYPE
#define NS_NAMESPACE namespace
#define NS_NAMESPACE_END
#else
#define NS_NAMESPACE_PROTOTYPE static
#define NS_NAMESPACE struct
#define NS_NAMESPACE_END ;
#endif // NS_USING_NAMESPACE
#if !defined(XP_MAC) && !defined(__KCC)
// PR_STDOUT and PR_STDIN are fatal on Macintosh. So for console i/o, we must use the std
// stream stuff instead. However, we have to require that cout and cin are passed in
// to the constructor because in the current build, there is a copy in the base.shlb,
// and another in the caller's file. Passing it in as a parameter ensures that the
// caller and this library are using the same global object. Groan.
//
// Unix currently does not support iostreams at all. Their compilers do not support
// ANSI C++, or even ARM C++.
//
// Windows supports them, but only if you turn on the -GX compile flag, to support
// exceptions.
// Catch 22.
#define NS_USE_PR_STDIO
#endif
#ifdef NS_USE_PR_STDIO
class istream;
class ostream;
#define CONSOLE_IN 0
#define CONSOLE_OUT 0
#else
#include <iostream>
using std::istream;
using std::ostream;
#define CONSOLE_IN &std::cin
#define CONSOLE_OUT &std::cout
#endif
//=========================== End Compiler-specific macros ===============================
//========================================================================================
class NS_COM nsInputStream
// This is a convenience class, for use on the STACK ("new" junkies: get detoxed first).
// Given a COM-style stream, this allows you to use the >> operators. It also acquires and
// reference counts its stream.
// Please read the comments at the top of this file
//========================================================================================
{
public:
nsInputStream(nsIInputStream* inStream)
: mInputStream(do_QueryInterface(inStream))
, mEOF(PR_FALSE)
{}
virtual ~nsInputStream();
nsCOMPtr<nsIInputStream> GetIStream() const
{
return mInputStream;
}
PRBool eof() const { return get_at_eof(); }
char get();
nsresult close()
{
NS_ASSERTION(mInputStream, "mInputStream is null!");
if (mInputStream) {
return mInputStream->Close();
}
return NS_OK;
}
PRInt32 read(void* s, PRInt32 n);
// Input streamers. Add more as needed (int&, unsigned int& etc). (but you have to
// add delegators to the derived classes, too, because these operators don't inherit).
nsInputStream& operator >> (char& ch);
// Support manipulators
nsInputStream& operator >> (nsInputStream& (*pf)(nsInputStream&))
{
return pf(*this);
}
protected:
// These certainly need to be overridden, they give the best shot we can at detecting
// eof in a simple nsIInputStream.
virtual void set_at_eof(PRBool atEnd)
{
mEOF = atEnd;
}
virtual PRBool get_at_eof() const
{
return mEOF;
}
private:
nsInputStream& operator >> (char* buf); // TOO DANGEROUS. DON'T DEFINE.
// private and unimplemented to disallow copies and assigns
nsInputStream(const nsInputStream& rhs);
nsInputStream& operator=(const nsInputStream& rhs);
// DATA
protected:
nsCOMPtr<nsIInputStream> mInputStream;
PRBool mEOF;
}; // class nsInputStream
typedef nsInputStream nsBasicInStream; // historic support for this name
//========================================================================================
class NS_COM nsOutputStream
// This is a convenience class, for use on the STACK ("new" junkies, get detoxed first).
// Given a COM-style stream, this allows you to use the << operators. It also acquires and
// reference counts its stream.
// Please read the comments at the top of this file
//========================================================================================
{
public:
nsOutputStream() {}
nsOutputStream(nsIOutputStream* inStream)
: mOutputStream(do_QueryInterface(inStream))
{}
virtual ~nsOutputStream();
nsCOMPtr<nsIOutputStream> GetIStream() const
{
return mOutputStream;
}
nsresult close()
{
if (mOutputStream)
return mOutputStream->Close();
return NS_OK;
}
void put(char c);
PRInt32 write(const void* s, PRInt32 n);
virtual nsresult flush();
// Output streamers. Add more as needed (but you have to add delegators to the derived
// classes, too, because these operators don't inherit).
nsOutputStream& operator << (const char* buf);
nsOutputStream& operator << (char ch);
nsOutputStream& operator << (short val);
nsOutputStream& operator << (unsigned short val);
nsOutputStream& operator << (long val);
nsOutputStream& operator << (unsigned long val);
nsOutputStream& operator << (int val);
nsOutputStream& operator << (unsigned int val);
// Support manipulators
nsOutputStream& operator << (nsOutputStream& (*pf)(nsOutputStream&))
{
return pf(*this);
}
private:
// private and unimplemented to disallow copies and assigns
nsOutputStream(const nsOutputStream& rhs);
nsOutputStream& operator=(const nsOutputStream& rhs);
// DATA
protected:
nsCOMPtr<nsIOutputStream> mOutputStream;
}; // class nsOutputStream
typedef nsOutputStream nsBasicOutStream; // Historic support for this name
//========================================================================================
class NS_COM nsErrorProne
// Common (virtual) base class for remembering errors on demand
//========================================================================================
{
public:
nsErrorProne() // for delayed opening
: mResult(NS_OK)
{
}
PRBool failed() const
{
return NS_FAILED(mResult);
}
nsresult error() const
{
return mResult;
}
// DATA
protected:
nsresult mResult;
}; // class nsErrorProne
//========================================================================================
class NS_COM nsFileClient
// Because COM does not allow us to write functions which return a boolean value etc,
// this class is here to take care of the tedious "declare variable then call with
// the address of the variable" chores.
//========================================================================================
: public virtual nsErrorProne
{
public:
nsFileClient(const nsCOMPtr<nsIOpenFile>& inFile)
: mFile(do_QueryInterface(inFile))
{
}
virtual ~nsFileClient() {}
void open(
const nsFileSpec& inFile,
int nsprMode,
PRIntn accessMode)
{
if (mFile)
mResult = mFile->Open(inFile, nsprMode, accessMode);
}
PRBool is_open() const
{
PRBool result = PR_FALSE;
if (mFile)
mFile->GetIsOpen(&result);
return result;
}
PRBool is_file() const
{
return mFile ? PR_TRUE : PR_FALSE;
}
protected:
nsFileClient() // for delayed opening
{
}
// DATA
protected:
nsCOMPtr<nsIOpenFile> mFile;
}; // class nsFileClient
//========================================================================================
class NS_COM nsRandomAccessStoreClient
// Because COM does not allow us to write functions which return a boolean value etc,
// this class is here to take care of the tedious "declare variable then call with
// the address of the variable" chores.
//========================================================================================
: public virtual nsErrorProne
{
public:
nsRandomAccessStoreClient() // for delayed opening
{
}
nsRandomAccessStoreClient(const nsCOMPtr<nsIRandomAccessStore>& inStore)
: mStore(do_QueryInterface(inStore))
{
}
virtual ~nsRandomAccessStoreClient() {}
void seek(PRInt32 offset)
{
seek(PR_SEEK_SET, offset);
}
void seek(PRSeekWhence whence, PRInt32 offset)
{
set_at_eof(PR_FALSE);
if (mStore)
mResult = mStore->Seek(whence, offset);
}
PRIntn tell()
{
PRIntn result = -1;
if (mStore)
mResult = mStore->Tell((PRUint32 *)&result);
return result;
}
protected:
virtual PRBool get_at_eof() const
{
PRBool result = PR_TRUE;
if (mStore)
mStore->GetAtEOF(&result);
return result;
}
virtual void set_at_eof(PRBool atEnd)
{
if (mStore)
mStore->SetAtEOF(atEnd);
}
private:
// private and unimplemented to disallow copies and assigns
nsRandomAccessStoreClient(const nsRandomAccessStoreClient& rhs);
nsRandomAccessStoreClient& operator=(const nsRandomAccessStoreClient& rhs);
// DATA
protected:
nsCOMPtr<nsIRandomAccessStore> mStore;
}; // class nsRandomAccessStoreClient
//========================================================================================
class NS_COM nsRandomAccessInputStream
// Please read the comments at the top of this file
//========================================================================================
: public nsRandomAccessStoreClient
, public nsInputStream
{
public:
nsRandomAccessInputStream(nsIInputStream* inStream)
: nsRandomAccessStoreClient(do_QueryInterface(inStream))
, nsInputStream(inStream)
{
}
PRBool readline(char* s, PRInt32 n);
// Result always null-terminated.
// Check eof() before each call.
// CAUTION: false result only indicates line was truncated
// to fit buffer, or an error occurred (OTHER THAN eof).
// Input streamers. Unfortunately, they don't inherit!
nsInputStream& operator >> (char& ch)
{ return nsInputStream::operator >>(ch); }
nsInputStream& operator >> (nsInputStream& (*pf)(nsInputStream&))
{ return nsInputStream::operator >>(pf); }
protected:
nsRandomAccessInputStream()
: nsInputStream(nsnull)
{
}
virtual PRBool get_at_eof() const
{
return nsRandomAccessStoreClient::get_at_eof();
}
virtual void set_at_eof(PRBool atEnd)
{
nsRandomAccessStoreClient::set_at_eof(atEnd);
}
private:
// private and unimplemented to disallow copies and assigns
nsRandomAccessInputStream(const nsRandomAccessInputStream& rhs);
nsRandomAccessInputStream& operator=(const nsRandomAccessInputStream& rhs);
}; // class nsRandomAccessInputStream
//========================================================================================
class NS_COM nsInputStringStream
//========================================================================================
: public nsRandomAccessInputStream
{
public:
nsInputStringStream(const char* stringToRead);
nsInputStringStream(const nsString& stringToRead);
// Input streamers. Unfortunately, they don't inherit!
nsInputStream& operator >> (char& ch)
{ return nsInputStream::operator >>(ch); }
nsInputStream& operator >> (nsInputStream& (*pf)(nsInputStream&))
{ return nsInputStream::operator >>(pf); }
private:
// private and unimplemented to disallow copies and assigns
nsInputStringStream(const nsInputStringStream& rhs);
nsInputStringStream& operator=(const nsInputStringStream& rhs);
}; // class nsInputStringStream
//========================================================================================
class NS_COM nsInputFileStream
// Please read the comments at the top of this file
//========================================================================================
: public nsRandomAccessInputStream
, public nsFileClient
{
public:
enum { kDefaultMode = PR_RDONLY };
nsInputFileStream(nsIInputStream* inStream)
: nsRandomAccessInputStream(inStream)
, nsFileClient(do_QueryInterface(inStream))
, mFileInputStream(do_QueryInterface(inStream))
{
}
nsInputFileStream(
const nsFileSpec& inFile,
int nsprMode = kDefaultMode,
PRIntn accessMode = 00666);
nsInputFileStream(nsIFileSpec* inFile);
virtual ~nsInputFileStream();
void Open(
const nsFileSpec& inFile,
int nsprMode = kDefaultMode,
PRIntn accessMode = 00666)
{
if (mFile)
mFile->Open(inFile, nsprMode, accessMode);
}
// Input streamers. Unfortunately, they don't inherit!
nsInputStream& operator >> (char& ch)
{ return nsInputStream::operator >>(ch); }
nsInputStream& operator >> (nsInputStream& (*pf)(nsInputStream&))
{ return nsInputStream::operator >>(pf); }
protected:
void AssignFrom(nsISupports* stream);
private:
// private and unimplemented to disallow copies and assigns
nsInputFileStream(const nsInputFileStream& rhs);
nsInputFileStream& operator=(const nsInputFileStream& rhs);
// DATA
protected:
nsCOMPtr<nsIFileSpecInputStream> mFileInputStream;
}; // class nsInputFileStream
//========================================================================================
class NS_COM nsRandomAccessOutputStream
// Please read the comments at the top of this file
//========================================================================================
: public nsRandomAccessStoreClient
, public nsOutputStream
{
public:
nsRandomAccessOutputStream(nsIOutputStream* inStream)
: nsRandomAccessStoreClient(do_QueryInterface(inStream))
, nsOutputStream(inStream)
{
}
// Output streamers. Unfortunately, they don't inherit!
nsOutputStream& operator << (const char* buf)
{ return nsOutputStream::operator << (buf); }
nsOutputStream& operator << (char ch)
{ return nsOutputStream::operator << (ch); }
nsOutputStream& operator << (short val)
{ return nsOutputStream::operator << (val); }
nsOutputStream& operator << (unsigned short val)
{ return nsOutputStream::operator << (val); }
nsOutputStream& operator << (long val)
{ return nsOutputStream::operator << (val); }
nsOutputStream& operator << (unsigned long val)
{ return nsOutputStream::operator << (val); }
nsOutputStream& operator << (int val)
{ return nsOutputStream::operator << (val); }
nsOutputStream& operator << (unsigned int val)
{ return nsOutputStream::operator << (val); }
nsOutputStream& operator << (nsOutputStream& (*pf)(nsOutputStream&))
{ return nsOutputStream::operator << (pf); }
protected:
nsRandomAccessOutputStream()
: nsOutputStream(nsnull)
{
}
private:
// private and unimplemented to disallow copies and assigns
nsRandomAccessOutputStream(const nsRandomAccessOutputStream& rhs);
nsRandomAccessOutputStream& operator=(const nsRandomAccessOutputStream& rhs);
}; // class nsRandomAccessOutputStream
//========================================================================================
class NS_COM nsOutputStringStream
//========================================================================================
: public nsRandomAccessOutputStream
{
public:
nsOutputStringStream(char*& stringToChange);
nsOutputStringStream(nsString& stringToChange);
// Output streamers. Unfortunately, they don't inherit!
nsOutputStream& operator << (const char* buf)
{ return nsOutputStream::operator << (buf); }
nsOutputStream& operator << (char ch)
{ return nsOutputStream::operator << (ch); }
nsOutputStream& operator << (short val)
{ return nsOutputStream::operator << (val); }
nsOutputStream& operator << (unsigned short val)
{ return nsOutputStream::operator << (val); }
nsOutputStream& operator << (long val)
{ return nsOutputStream::operator << (val); }
nsOutputStream& operator << (unsigned long val)
{ return nsOutputStream::operator << (val); }
nsOutputStream& operator << (int val)
{ return nsOutputStream::operator << (val); }
nsOutputStream& operator << (unsigned int val)
{ return nsOutputStream::operator << (val); }
nsOutputStream& operator << (nsOutputStream& (*pf)(nsOutputStream&))
{ return nsOutputStream::operator << (pf); }
private:
// private and unimplemented to disallow copies and assigns
nsOutputStringStream(const nsOutputStringStream& rhs);
nsOutputStringStream& operator=(const nsOutputStringStream& rhs);
}; // class nsOutputStringStream
//========================================================================================
class NS_COM nsOutputFileStream
// Please read the comments at the top of this file
//========================================================================================
: public nsRandomAccessOutputStream
, public nsFileClient
{
public:
enum { kDefaultMode = (PR_WRONLY | PR_CREATE_FILE | PR_TRUNCATE) };
nsOutputFileStream() {}
nsOutputFileStream(nsIOutputStream* inStream)
{
AssignFrom(inStream);
}
nsOutputFileStream(
const nsFileSpec& inFile,
int nsprMode = kDefaultMode,
PRIntn accessMode = 00666)
{
nsISupports* stream;
if (NS_FAILED(NS_NewIOFileStream(
&stream,
inFile, nsprMode, accessMode)))
return;
AssignFrom(stream);
NS_RELEASE(stream);
}
nsOutputFileStream(nsIFileSpec* inFile);
virtual ~nsOutputFileStream();
virtual nsresult flush();
virtual void abort();
// Output streamers. Unfortunately, they don't inherit!
nsOutputStream& operator << (const char* buf)
{ return nsOutputStream::operator << (buf); }
nsOutputStream& operator << (char ch)
{ return nsOutputStream::operator << (ch); }
nsOutputStream& operator << (short val)
{ return nsOutputStream::operator << (val); }
nsOutputStream& operator << (unsigned short val)
{ return nsOutputStream::operator << (val); }
nsOutputStream& operator << (long val)
{ return nsOutputStream::operator << (val); }
nsOutputStream& operator << (unsigned long val)
{ return nsOutputStream::operator << (val); }
nsOutputStream& operator << (int val)
{ return nsOutputStream::operator << (val); }
nsOutputStream& operator << (unsigned int val)
{ return nsOutputStream::operator << (val); }
nsOutputStream& operator << (nsOutputStream& (*pf)(nsOutputStream&))
{ return nsOutputStream::operator << (pf); }
protected:
void AssignFrom(nsISupports* stream);
private:
// private and unimplemented to disallow copies and assigns
nsOutputFileStream(const nsOutputFileStream& rhs);
nsOutputFileStream& operator=(const nsOutputFileStream& rhs);
// DATA
protected:
nsCOMPtr<nsIFileSpecOutputStream> mFileOutputStream;
}; // class nsOutputFileStream
//========================================================================================
class NS_COM nsIOFileStream
// Please read the comments at the top of this file
//========================================================================================
: public nsInputFileStream
, public nsOutputStream
{
public:
enum { kDefaultMode = (PR_RDWR | PR_CREATE_FILE) };
nsIOFileStream(
nsIInputStream* inInputStream
, nsIOutputStream* inOutputStream)
: nsInputFileStream(inInputStream)
, nsOutputStream(inOutputStream)
, mFileOutputStream(do_QueryInterface(inOutputStream))
{
}
nsIOFileStream(
const nsFileSpec& inFile,
int nsprMode = kDefaultMode,
PRIntn accessMode = 00666)
: nsInputFileStream((nsIInputStream*)nsnull)
, nsOutputStream(nsnull)
{
nsISupports* stream;
if (NS_FAILED(NS_NewIOFileStream(
&stream,
inFile, nsprMode, accessMode)))
return;
mFile = do_QueryInterface(stream);
mStore = do_QueryInterface(stream);
mInputStream = do_QueryInterface(stream);
mOutputStream = do_QueryInterface(stream);
mFileInputStream = do_QueryInterface(stream);
mFileOutputStream = do_QueryInterface(stream);
NS_RELEASE(stream);
}
virtual nsresult close()
{
// Doesn't matter which of the two we close:
// they're hooked up to the same file.
return nsInputFileStream::close();
}
// Output streamers. Unfortunately, they don't inherit!
nsOutputStream& operator << (const char* buf)
{ return nsOutputStream::operator << (buf); }
nsOutputStream& operator << (char ch)
{ return nsOutputStream::operator << (ch); }
nsOutputStream& operator << (short val)
{ return nsOutputStream::operator << (val); }
nsOutputStream& operator << (unsigned short val)
{ return nsOutputStream::operator << (val); }
nsOutputStream& operator << (long val)
{ return nsOutputStream::operator << (val); }
nsOutputStream& operator << (unsigned long val)
{ return nsOutputStream::operator << (val); }
nsOutputStream& operator << (int val)
{ return nsOutputStream::operator << (val); }
nsOutputStream& operator << (unsigned int val)
{ return nsOutputStream::operator << (val); }
nsOutputStream& operator << (nsOutputStream& (*pf)(nsOutputStream&))
{ return nsOutputStream::operator << (pf); }
// Input streamers. Unfortunately, they don't inherit!
nsInputStream& operator >> (char& ch)
{ return nsInputStream::operator >>(ch); }
nsInputStream& operator >> (nsInputStream& (*pf)(nsInputStream&))
{ return nsInputStream::operator >>(pf); }
virtual nsresult flush() {if (mFileOutputStream) mFileOutputStream->Flush(); return error(); }
private:
// private and unimplemented to disallow copies and assigns
nsIOFileStream(const nsIOFileStream& rhs);
nsIOFileStream& operator=(const nsIOFileStream& rhs);
// DATA
protected:
nsCOMPtr<nsIFileSpecOutputStream> mFileOutputStream;
}; // class nsIOFileStream
//========================================================================================
// Manipulators
//========================================================================================
NS_COM nsOutputStream& nsEndl(nsOutputStream& os); // outputs and FLUSHES.
//========================================================================================
#endif /* _FILESTREAM_H_ */
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