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744 lines
35 KiB
C++
744 lines
35 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0(the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright(C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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// First checked in on 98/11/20 by John R. McMullen in the wrong directory.
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// Checked in again 98/12/04.
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// Polished version 98/12/08.
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// Completely rewritten to integrate with nsIInputStream and nsIOutputStream (the
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// xpcom stream objects.
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//========================================================================================
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//
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// Classes defined:
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//
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// nsInputStream, nsOutputStream
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// These are the lightweight STATICALLY LINKED wrappers for
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// the xpcom objects nsIInputStream and nsIOutputstream.
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// Possible uses:
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// If you are implementing a function that accepts one of these xpcom
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// streams, just make one of these little jobbies on the stack, and
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// the handy << or >> notation can be yours.
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//
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// nsInputFileStream, nsOutputFileStream
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// These are the STATICALLY LINKED wrappers for the file-related
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// versions of the above.
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// nsIOFileStream
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// An input and output file stream attached to the same file.
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//
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// This suite provide the following services:
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//
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// 1. Encapsulates all platform-specific file details, so that file i/o
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// can be done correctly without any platform #ifdefs
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//
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// 2. Uses NSPR file services (NOT ansi file I/O), in order to get best
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// native performance. This performance difference is especially large on
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// macintosh.
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//
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// 3. Allows all the power of the ansi stream syntax.
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//
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// Basic example:
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//
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// nsFileSpec myPath("/Development/iotest.txt");
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//
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// nsOutputFileStream testStream(myPath);
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// testStream << "Hello World" << nsEndl;
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//
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// 4. Requires streams to be constructed using typesafe nsFileSpec specifier
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// (not the notorious and bug prone const char*), namely nsFileSpec. See
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// nsFileSpec.h for more details.
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//
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// 5. Fixes a bug that have been there for a long time, and
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// is inevitable if you use NSPR alone:
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//
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// The problem on platforms (Macintosh) in which a path does not fully
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// specify a file, because two volumes can have the same name.
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//
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// Not yet provided:
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//
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// Endian-awareness for reading and writing crossplatform binary files. At this
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// time there seems to be no demand for this.
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//
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//========================================================================================
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#ifndef _FILESTREAM_H_
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#define _FILESTREAM_H_
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#include "nscore.h"
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#ifdef XP_MAC
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#include "pprio.h" // To get PR_ImportFile
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#else
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#include "prio.h"
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#endif
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#include "nsCOMPtr.h"
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#include "nsIFileStream.h"
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// Defined elsewhere
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class nsFileSpec;
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class nsString;
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class nsIInputStream;
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class nsIOutputStream;
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//========================================================================================
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// Compiler-specific macros, as needed
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//========================================================================================
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#if !defined(NS_USING_NAMESPACE) && (defined(__MWERKS__) || defined(XP_PC))
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#define NS_USING_NAMESPACE
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#endif
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#if !defined(NS_USING_STL) && (defined(__MWERKS__) || defined(XP_PC))
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#define NS_USING_STL
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#endif
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#ifdef NS_USING_NAMESPACE
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#define NS_NAMESPACE_PROTOTYPE
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#define NS_NAMESPACE namespace
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#define NS_NAMESPACE_END
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#else
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#define NS_NAMESPACE_PROTOTYPE static
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#define NS_NAMESPACE struct
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#define NS_NAMESPACE_END ;
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#endif // NS_USING_NAMESPACE
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#ifndef XP_MAC
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// PR_STDOUT and PR_STDIN are fatal on Macintosh. So for console i/o, we must use the std
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// stream stuff instead. However, we have to require that cout and cin are passed in
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// to the constructor because in the current build, there is a copy in the base.shlb,
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// and another in the caller's file. Passing it in as a parameter ensures that the
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// caller and this library are using the same global object. Groan.
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//
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// Unix currently does not support iostreams at all. Their compilers do not support
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// ANSI C++, or even ARM C++.
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//
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// Windows supports them, but only if you turn on the -GX compile flag, to support
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// exceptions.
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// Catch 22.
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#define NS_USE_PR_STDIO
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#endif
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#ifdef NS_USE_PR_STDIO
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class istream;
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class ostream;
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#define CONSOLE_IN 0
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#define CONSOLE_OUT 0
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#else
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#include <iostream>
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using std::istream;
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using std::ostream;
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#define CONSOLE_IN &std::cin
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#define CONSOLE_OUT &std::cout
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#endif
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//=========================== End Compiler-specific macros ===============================
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//========================================================================================
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class NS_BASE nsInputStream
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// This is a convenience class, for use on the STACK ("new" junkies: get detoxed first).
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// Given a COM-style stream, this allows you to use the >> operators. It also acquires and
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// reference counts its stream.
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// Please read the comments at the top of this file
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//========================================================================================
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{
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public:
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nsInputStream(nsIInputStream* inStream)
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: mInputStream(do_QueryInterface(inStream))
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, mEOF(PR_FALSE)
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{}
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virtual ~nsInputStream();
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nsCOMPtr<nsIInputStream> GetIStream() const
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{
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return mInputStream;
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}
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PRBool eof() const { return get_at_eof(); }
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char get();
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void close()
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{
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mInputStream->Close();
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}
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PRInt32 read(void* s, PRInt32 n);
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// Input streamers. Add more as needed (int&, unsigned int& etc). (but you have to
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// add delegators to the derived classes, too, because these operators don't inherit).
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nsInputStream& operator >> (char& ch);
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// Support manipulators
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nsInputStream& operator >> (nsInputStream& (*pf)(nsInputStream&))
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{
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return pf(*this);
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}
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protected:
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// These certainly need to be overridden, they give the best shot we can at detecting
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// eof in a simple nsIInputStream.
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virtual void set_at_eof(PRBool atEnd)
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{
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mEOF = atEnd;
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}
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virtual PRBool get_at_eof() const
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{
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return mEOF;
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}
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private:
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nsInputStream& operator >> (char* buf); // TOO DANGEROUS. DON'T DEFINE.
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// DATA
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protected:
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nsCOMPtr<nsIInputStream> mInputStream;
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PRBool mEOF;
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}; // class nsInputStream
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typedef nsInputStream nsBasicInStream; // historic support for this name
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//========================================================================================
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class NS_BASE nsOutputStream
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// This is a convenience class, for use on the STACK ("new" junkies, get detoxed first).
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// Given a COM-style stream, this allows you to use the << operators. It also acquires and
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// reference counts its stream.
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// Please read the comments at the top of this file
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//========================================================================================
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{
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public:
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nsOutputStream() {}
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nsOutputStream(nsIOutputStream* inStream)
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: mOutputStream(do_QueryInterface(inStream))
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{}
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virtual ~nsOutputStream();
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nsCOMPtr<nsIOutputStream> GetIStream() const
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{
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return mOutputStream;
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}
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void close()
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{
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mOutputStream->Close();
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}
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void put(char c);
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PRInt32 write(const void* s, PRInt32 n);
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virtual void flush();
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// Output streamers. Add more as needed (but you have to add delegators to the derived
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// classes, too, because these operators don't inherit).
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nsOutputStream& operator << (const char* buf);
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nsOutputStream& operator << (char ch);
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nsOutputStream& operator << (short val);
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nsOutputStream& operator << (unsigned short val);
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nsOutputStream& operator << (long val);
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nsOutputStream& operator << (unsigned long val);
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nsOutputStream& operator << (int val);
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nsOutputStream& operator << (unsigned int val);
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// Support manipulators
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nsOutputStream& operator << (nsOutputStream& (*pf)(nsOutputStream&))
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{
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return pf(*this);
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}
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// DATA
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protected:
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nsCOMPtr<nsIOutputStream> mOutputStream;
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}; // class nsOutputStream
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typedef nsOutputStream nsBasicOutStream; // Historic support for this name
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//========================================================================================
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class NS_BASE nsErrorProne
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// Common (virtual) base class for remembering errors on demand
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//========================================================================================
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{
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public:
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nsErrorProne() // for delayed opening
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: mResult(NS_OK)
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{
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}
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PRBool failed() const
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{
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return NS_FAILED(mResult);
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}
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// DATA
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protected:
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nsresult mResult;
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}; // class nsErrorProne
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//========================================================================================
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class NS_BASE nsFileClient
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// Because COM does not allow us to write functions which return a boolean value etc,
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// this class is here to take care of the tedious "declare variable then call with
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// the address of the variable" chores.
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//========================================================================================
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: public virtual nsErrorProne
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{
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public:
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nsFileClient(const nsCOMPtr<nsIFile>& inFile)
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: mFile(do_QueryInterface(inFile))
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{
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}
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virtual ~nsFileClient() {}
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void open(
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const nsFileSpec& inFile,
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int nsprMode,
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PRIntn accessMode)
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{
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if (mFile)
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mResult = mFile->Open(inFile, nsprMode, accessMode);
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}
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PRBool is_open() const
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{
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PRBool result = PR_FALSE;
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if (mFile)
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mFile->GetIsOpen(&result);
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return result;
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}
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PRBool is_file() const
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{
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return mFile ? PR_TRUE : PR_FALSE;
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}
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protected:
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nsFileClient() // for delayed opening
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{
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}
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// DATA
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protected:
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nsCOMPtr<nsIFile> mFile;
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}; // class nsFileClient
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//========================================================================================
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class NS_BASE nsRandomAccessStoreClient
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// Because COM does not allow us to write functions which return a boolean value etc,
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// this class is here to take care of the tedious "declare variable then call with
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// the address of the variable" chores.
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//========================================================================================
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: public virtual nsErrorProne
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{
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public:
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nsRandomAccessStoreClient() // for delayed opening
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{
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}
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nsRandomAccessStoreClient(const nsCOMPtr<nsIRandomAccessStore>& inStore)
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: mStore(do_QueryInterface(inStore))
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{
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}
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virtual ~nsRandomAccessStoreClient() {}
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void seek(PRInt32 offset)
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{
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seek(PR_SEEK_SET, offset);
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}
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void seek(PRSeekWhence whence, PRInt32 offset)
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{
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set_at_eof(PR_FALSE);
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if (mStore)
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mResult = mStore->Seek(whence, offset);
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}
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PRIntn tell()
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{
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PRIntn result = -1;
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if (mStore)
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mResult = mStore->Tell(&result);
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return result;
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}
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protected:
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virtual PRBool get_at_eof() const
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{
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PRBool result = PR_TRUE;
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if (mStore)
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mStore->GetAtEOF(&result);
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return result;
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}
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virtual void set_at_eof(PRBool atEnd)
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{
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if (mStore)
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mStore->SetAtEOF(atEnd);
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}
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// DATA
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protected:
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nsCOMPtr<nsIRandomAccessStore> mStore;
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}; // class nsRandomAccessStoreClient
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//========================================================================================
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class NS_BASE nsRandomAccessInputStream
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// Please read the comments at the top of this file
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//========================================================================================
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: public nsRandomAccessStoreClient
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, public nsInputStream
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{
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public:
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nsRandomAccessInputStream(nsIInputStream* inStream)
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: nsRandomAccessStoreClient(do_QueryInterface(inStream))
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, nsInputStream(inStream)
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{
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}
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PRBool readline(char* s, PRInt32 n);
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// Result always null-terminated.
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// Check eof() before each call.
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// CAUTION: false result only indicates line was truncated
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// to fit buffer, or an error occurred (OTHER THAN eof).
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// Input streamers. Unfortunately, they don't inherit!
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nsInputStream& operator >> (char& ch)
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{ return nsInputStream::operator >>(ch); }
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nsInputStream& operator >> (nsInputStream& (*pf)(nsInputStream&))
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{ return nsInputStream::operator >>(pf); }
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protected:
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nsRandomAccessInputStream()
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: nsInputStream(nsnull)
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{
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}
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virtual PRBool get_at_eof() const
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{
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return nsRandomAccessStoreClient::get_at_eof();
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}
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virtual void set_at_eof(PRBool atEnd)
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{
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nsRandomAccessStoreClient::set_at_eof(atEnd);
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}
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}; // class nsRandomAccessInputStream
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//========================================================================================
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class NS_BASE nsInputStringStream
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//========================================================================================
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: public nsRandomAccessInputStream
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{
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public:
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nsInputStringStream(const char* stringToRead);
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nsInputStringStream(const nsString& stringToRead);
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// Input streamers. Unfortunately, they don't inherit!
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nsInputStream& operator >> (char& ch)
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{ return nsInputStream::operator >>(ch); }
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nsInputStream& operator >> (nsInputStream& (*pf)(nsInputStream&))
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{ return nsInputStream::operator >>(pf); }
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}; // class nsInputStringStream
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//========================================================================================
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class NS_BASE nsInputFileStream
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// Please read the comments at the top of this file
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//========================================================================================
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: public nsRandomAccessInputStream
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, public nsFileClient
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{
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public:
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enum { kDefaultMode = PR_RDONLY };
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nsInputFileStream(nsIInputStream* inStream)
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: nsRandomAccessInputStream(inStream)
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, nsFileClient(do_QueryInterface(inStream))
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, mFileInputStream(do_QueryInterface(inStream))
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{
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}
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nsInputFileStream(
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const nsFileSpec& inFile,
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int nsprMode = kDefaultMode,
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PRIntn accessMode = 00700); // <- OCTAL
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void Open(
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const nsFileSpec& inFile,
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int nsprMode = kDefaultMode,
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PRIntn accessMode = 00700) // <- OCTAL
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{
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if (mFile)
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mFile->Open(inFile, nsprMode, accessMode);
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}
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// Input streamers. Unfortunately, they don't inherit!
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nsInputStream& operator >> (char& ch)
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{ return nsInputStream::operator >>(ch); }
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nsInputStream& operator >> (nsInputStream& (*pf)(nsInputStream&))
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{ return nsInputStream::operator >>(pf); }
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// DATA
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protected:
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nsCOMPtr<nsIFileInputStream> mFileInputStream;
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}; // class nsInputFileStream
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//========================================================================================
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class NS_BASE nsRandomAccessOutputStream
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// Please read the comments at the top of this file
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//========================================================================================
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: public nsRandomAccessStoreClient
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, public nsOutputStream
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{
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public:
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nsRandomAccessOutputStream(nsIOutputStream* inStream)
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: nsRandomAccessStoreClient(do_QueryInterface(inStream))
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, nsOutputStream(inStream)
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{
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}
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// Output streamers. Unfortunately, they don't inherit!
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nsOutputStream& operator << (const char* buf)
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{ return nsOutputStream::operator << (buf); }
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nsOutputStream& operator << (char ch)
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{ return nsOutputStream::operator << (ch); }
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nsOutputStream& operator << (short val)
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{ return nsOutputStream::operator << (val); }
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nsOutputStream& operator << (unsigned short val)
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{ return nsOutputStream::operator << (val); }
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nsOutputStream& operator << (long val)
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{ return nsOutputStream::operator << (val); }
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nsOutputStream& operator << (unsigned long val)
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{ return nsOutputStream::operator << (val); }
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nsOutputStream& operator << (int val)
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{ return nsOutputStream::operator << (val); }
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nsOutputStream& operator << (unsigned int val)
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{ return nsOutputStream::operator << (val); }
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nsOutputStream& operator << (nsOutputStream& (*pf)(nsOutputStream&))
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{ return nsOutputStream::operator << (pf); }
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protected:
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nsRandomAccessOutputStream()
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: nsOutputStream(nsnull)
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{
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}
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}; // class nsRandomAccessOutputStream
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//========================================================================================
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class NS_BASE nsOutputStringStream
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//========================================================================================
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: public nsRandomAccessOutputStream
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{
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public:
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nsOutputStringStream(char*& stringToChange);
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nsOutputStringStream(nsString& stringToChange);
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|
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// Output streamers. Unfortunately, they don't inherit!
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nsOutputStream& operator << (const char* buf)
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{ return nsOutputStream::operator << (buf); }
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nsOutputStream& operator << (char ch)
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{ return nsOutputStream::operator << (ch); }
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nsOutputStream& operator << (short val)
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{ return nsOutputStream::operator << (val); }
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nsOutputStream& operator << (unsigned short val)
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{ return nsOutputStream::operator << (val); }
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nsOutputStream& operator << (long val)
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{ return nsOutputStream::operator << (val); }
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nsOutputStream& operator << (unsigned long val)
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{ return nsOutputStream::operator << (val); }
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nsOutputStream& operator << (int val)
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{ return nsOutputStream::operator << (val); }
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nsOutputStream& operator << (unsigned int val)
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{ return nsOutputStream::operator << (val); }
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nsOutputStream& operator << (nsOutputStream& (*pf)(nsOutputStream&))
|
|
{ return nsOutputStream::operator << (pf); }
|
|
|
|
}; // class nsOutputStringStream
|
|
|
|
//========================================================================================
|
|
class NS_BASE 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(
|
|
const nsFileSpec& inFile,
|
|
int nsprMode = kDefaultMode,
|
|
PRIntn accessMode = 00700) // <- OCTAL
|
|
{
|
|
nsISupports* stream;
|
|
if (NS_FAILED(NS_NewIOFileStream(
|
|
&stream,
|
|
inFile, nsprMode, accessMode)))
|
|
return;
|
|
mFile = nsQueryInterface(stream);
|
|
mOutputStream = nsQueryInterface(stream);
|
|
mStore = nsQueryInterface(stream);
|
|
mFileOutputStream = nsQueryInterface(stream);
|
|
NS_RELEASE(stream);
|
|
}
|
|
|
|
virtual void flush();
|
|
|
|
// 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); }
|
|
|
|
// DATA
|
|
protected:
|
|
nsCOMPtr<nsIFileOutputStream> mFileOutputStream;
|
|
}; // class nsOutputFileStream
|
|
|
|
//========================================================================================
|
|
class NS_BASE nsOutputConsoleStream
|
|
// Please read the comments at the top of this file
|
|
//========================================================================================
|
|
: public nsOutputFileStream
|
|
{
|
|
public:
|
|
|
|
nsOutputConsoleStream()
|
|
{
|
|
nsISupports* stream;
|
|
if (NS_FAILED(NS_NewOutputConsoleStream(&stream)))
|
|
return;
|
|
mFile = nsQueryInterface(stream);
|
|
mOutputStream = nsQueryInterface(stream);
|
|
mFileOutputStream = nsQueryInterface(stream);
|
|
NS_RELEASE(stream);
|
|
}
|
|
|
|
// 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); }
|
|
|
|
}; // class nsOutputConsoleStream
|
|
|
|
//========================================================================================
|
|
class NS_BASE 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 = 00700) // <- OCTAL
|
|
: nsInputFileStream(nsnull)
|
|
, nsOutputStream(nsnull)
|
|
{
|
|
nsISupports* stream;
|
|
if (NS_FAILED(NS_NewIOFileStream(
|
|
&stream,
|
|
inFile, nsprMode, accessMode)))
|
|
return;
|
|
mFile = nsQueryInterface(stream);
|
|
mStore = nsQueryInterface(stream);
|
|
mInputStream = nsQueryInterface(stream);
|
|
mOutputStream = nsQueryInterface(stream);
|
|
mFileInputStream = nsQueryInterface(stream);
|
|
mFileOutputStream = nsQueryInterface(stream);
|
|
NS_RELEASE(stream);
|
|
}
|
|
|
|
virtual void close()
|
|
{
|
|
// Doesn't matter which of the two we close:
|
|
// they're hooked up to the same file.
|
|
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); }
|
|
|
|
// DATA
|
|
protected:
|
|
nsCOMPtr<nsIFileOutputStream> mFileOutputStream;
|
|
}; // class nsIOFileStream
|
|
|
|
//========================================================================================
|
|
// Manipulators
|
|
//========================================================================================
|
|
|
|
NS_BASE nsOutputStream& nsEndl(nsOutputStream& os); // outputs and FLUSHES.
|
|
|
|
|
|
#endif /* _FILESTREAM_H_ */
|