gecko-dev/xpcom/io/nsStdFileStream.cpp

134 строки
4.1 KiB
C++
Исходник Обычный вид История

1998-12-19 01:38:28 +03:00
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
// First checked in on 98/12/08 by John R. McMullen.
// Since nsFileStream.h is entirely templates, common code (such as open())
// which does not actually depend on the charT, can be placed here.
#ifdef XP_UNIX
// Compile the un-inlined functions in this file only.
#define DEFINING_FILE_STREAM
#endif
#include "nsStdFileStream.h"
#ifdef XP_MAC
#include <Errors.h>
#endif
//----------------------------------------------------------------------------------------
PRFileDesc* nsFileStreamHelpers::open(
const nsFilePath& inFile,
IOS_BASE::openmode mode,
PRIntn accessMode)
//----------------------------------------------------------------------------------------
{
PRFileDesc* descriptor = 0;
const IOS_BASE::openmode valid_modes[]=
{
IOS_BASE::out,
IOS_BASE::out | IOS_BASE::app,
IOS_BASE::out | IOS_BASE::trunc,
IOS_BASE::in,
IOS_BASE::in | IOS_BASE::out,
IOS_BASE::in | IOS_BASE::out | IOS_BASE::trunc,
// IOS_BASE::out | IOS_BASE::binary,
// IOS_BASE::out | IOS_BASE::app | IOS_BASE::binary,
// IOS_BASE::out | IOS_BASE::trunc | IOS_BASE::binary,
// IOS_BASE::in | IOS_BASE::binary,
// IOS_BASE::in | IOS_BASE::out | IOS_BASE::binary,
// IOS_BASE::in | IOS_BASE::out | IOS_BASE::trunc | IOS_BASE::binary,
0
};
const int nspr_modes[]={
PR_WRONLY | PR_CREATE_FILE,
PR_WRONLY | PR_CREATE_FILE | PR_APPEND,
PR_WRONLY | PR_CREATE_FILE | PR_TRUNCATE,
PR_RDONLY,
PR_RDONLY | PR_APPEND,
PR_RDWR | PR_CREATE_FILE,
PR_RDWR | PR_CREATE_FILE | PR_TRUNCATE,
// "wb",
// "ab",
// "wb",
// "rb",
// "r+b",
// "w+b",
0 };
int ind=0;
while (valid_modes[ind] && valid_modes[ind] != (mode&~IOS_BASE::ate))
++ind;
if (!nspr_modes[ind])
return 0;
#ifdef XP_MAC
// Use the file spec to open the file, because one path can be common to
// several files on the Macintosh (you can have several volumes with the
// same name, see).
descriptor = 0;
if (inFile.GetNativeSpec().Error() != noErr)
return 0;
OSErr err = noErr;
#if DEBUG
const OSType kCreator = 'CWIE';
#else
const OSType kCreator = 'MOSS';
#endif
nsNativeFileSpec nativeSpec = inFile.GetNativeSpec();
FSSpec* spec = (FSSpec*)nativeSpec;
if (nspr_modes[ind] & PR_CREATE_FILE)
err = FSpCreate(spec, kCreator, 'TEXT', 0);
if (err == dupFNErr)
err = noErr;
if (err != noErr)
return 0;
SInt8 perm;
if (nspr_modes[ind] & PR_RDWR)
perm = fsRdWrPerm;
else if (nspr_modes[ind] & PR_WRONLY)
perm = fsWrPerm;
else
perm = fsRdPerm;
short refnum;
err = FSpOpenDF(spec, perm, &refnum);
if (err == noErr && (nspr_modes[ind] & PR_TRUNCATE))
err = SetEOF(refnum, 0);
if (err == noErr && (nspr_modes[ind] & PR_APPEND))
err = SetFPos(refnum, fsFromLEOF, 0);
if (err != noErr)
return 0;
if ((descriptor = PR_ImportFile(refnum)) == 0)
return 0;
#else
// Platforms other than Macintosh...
if ((descriptor = PR_Open(inFile, nspr_modes[ind], accessMode)) != 0)
#endif
if (mode&IOS_BASE::ate && PR_Seek(descriptor, 0, PR_SEEK_END) >= 0)
{
PR_Close(descriptor);
descriptor = 0;
return 0;
}
return descriptor;
} // nsFileStreamHelpers::open