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gecko-dev/xpcom/io/nsFileStream.h

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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();
nsresult lastWriteStatus();
// 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);
nsresult mWriteStatus;
// 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 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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