gecko-dev/xpcom/io/nsFileStream.cpp

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Исходник Обычный вид История

/* -*- 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
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*
* 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/
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*
* 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.
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*
* 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 ***** */
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// 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.
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#include "nsFileStream.h"
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#include "nsFileSpec.h"
#include "nsIFileSpec.h"
#include "nsIStringStream.h"
#include <string.h>
#include <stdio.h>
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//========================================================================================
// nsInputStream
//========================================================================================
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//----------------------------------------------------------------------------------------
nsInputStream::~nsInputStream()
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//----------------------------------------------------------------------------------------
{
}
//----------------------------------------------------------------------------------------
char nsInputStream::get()
//----------------------------------------------------------------------------------------
{
char c;
if (read(&c, sizeof(c)) == sizeof(c))
return c;
return 0;
}
//----------------------------------------------------------------------------------------
PRInt32 nsInputStream::read(void* s, PRInt32 n)
//----------------------------------------------------------------------------------------
{
if (!mInputStream)
return 0;
PRInt32 result = 0;
mInputStream->Read((char*)s, n, (PRUint32*)&result);
if (result == 0)
set_at_eof(PR_TRUE);
return result;
} // nsInputStream::read
//----------------------------------------------------------------------------------------
static void TidyEndOfLine(char*& cp)
// Assumes that cp is pointing at \n or \r. Nulls out the character, checks for
// a second terminator (of the opposite persuasion), and returns cp pointing past the
// entire eol construct (one or two characters).
//----------------------------------------------------------------------------------------
{
char ch = *cp;
*cp++ = '\0'; // terminate at the newline, then skip past it
if ((ch == '\n' && *cp == '\r') || (ch == '\r' && *cp == '\n'))
cp++; // possibly a pair.
}
//----------------------------------------------------------------------------------------
nsInputStream& nsInputStream::operator >> (char& c)
//----------------------------------------------------------------------------------------
{
c = get();
return *this;
}
//========================================================================================
// nsOutputStream
//========================================================================================
//----------------------------------------------------------------------------------------
nsOutputStream::~nsOutputStream()
//----------------------------------------------------------------------------------------
{
}
//----------------------------------------------------------------------------------------
void nsOutputStream::put(char c)
//----------------------------------------------------------------------------------------
{
write(&c, sizeof(c));
}
//----------------------------------------------------------------------------------------
PRInt32 nsOutputStream::write(const void* s, PRInt32 n)
//----------------------------------------------------------------------------------------
{
if (!mOutputStream)
return 0;
PRInt32 result = 0;
mOutputStream->Write((char*)s, n, (PRUint32*)&result);
return result;
} // nsOutputStream::write
//----------------------------------------------------------------------------------------
nsresult nsOutputStream::flush()
//----------------------------------------------------------------------------------------
{
return NS_OK;
}
//----------------------------------------------------------------------------------------
nsOutputStream& nsOutputStream::operator << (char c)
//----------------------------------------------------------------------------------------
{
put(c);
return *this;
}
//----------------------------------------------------------------------------------------
nsOutputStream& nsOutputStream::operator << (const char* s)
//----------------------------------------------------------------------------------------
{
if (s)
write(s, strlen(s));
return *this;
}
//----------------------------------------------------------------------------------------
nsOutputStream& nsOutputStream::operator << (short val)
//----------------------------------------------------------------------------------------
{
char buf[30];
sprintf(buf, "%hd", val);
return (*this << buf);
}
//----------------------------------------------------------------------------------------
nsOutputStream& nsOutputStream::operator << (unsigned short val)
//----------------------------------------------------------------------------------------
{
char buf[30];
sprintf(buf, "%hu", val);
return (*this << buf);
}
//----------------------------------------------------------------------------------------
nsOutputStream& nsOutputStream::operator << (long val)
//----------------------------------------------------------------------------------------
{
char buf[30];
sprintf(buf, "%ld", val);
return (*this << buf);
}
//----------------------------------------------------------------------------------------
nsOutputStream& nsOutputStream::operator << (unsigned long val)
//----------------------------------------------------------------------------------------
{
char buf[30];
sprintf(buf, "%lu", val);
return (*this << buf);
}
//----------------------------------------------------------------------------------------
nsOutputStream& nsOutputStream::operator << (int val)
//----------------------------------------------------------------------------------------
{
char buf[30];
sprintf(buf, "%d", val);
return (*this << buf);
}
//----------------------------------------------------------------------------------------
nsOutputStream& nsOutputStream::operator << (unsigned int val)
//----------------------------------------------------------------------------------------
{
char buf[30];
sprintf(buf, "%u", val);
return (*this << buf);
}
//========================================================================================
// nsRandomAccessInputStream
//========================================================================================
//----------------------------------------------------------------------------------------
PRBool nsRandomAccessInputStream::readline(char* s, PRInt32 n)
// This will truncate if the buffer is too small. Result will always be null-terminated.
//----------------------------------------------------------------------------------------
{
PRBool bufferLargeEnough = PR_TRUE; // result
if (!s || !n)
return PR_TRUE;
PRIntn position = tell();
if (position < 0)
return PR_FALSE;
PRInt32 bytesRead = read(s, n - 1);
if (failed())
return PR_FALSE;
s[bytesRead] = '\0'; // always terminate at the end of the buffer
char* tp = strpbrk(s, "\n\r");
if (tp)
{
TidyEndOfLine(tp);
bytesRead = (tp - s);
}
else if (!eof() && n-1 == bytesRead)
bufferLargeEnough = PR_FALSE;
position += bytesRead;
seek(position);
return bufferLargeEnough;
} // nsRandomAccessInputStream::readline
//========================================================================================
// nsInputStringStream
//========================================================================================
//----------------------------------------------------------------------------------------
nsInputStringStream::nsInputStringStream(const char* stringToRead)
//----------------------------------------------------------------------------------------
{
nsISupports* stream;
if (NS_FAILED(NS_NewCharInputStream(&stream, stringToRead)))
return;
mInputStream = do_QueryInterface(stream);
mStore = do_QueryInterface(stream);
NS_RELEASE(stream);
}
//----------------------------------------------------------------------------------------
nsInputStringStream::nsInputStringStream(const nsString& stringToRead)
//----------------------------------------------------------------------------------------
{
nsISupports* stream;
if (NS_FAILED(NS_NewStringInputStream(&stream, stringToRead)))
return;
mInputStream = do_QueryInterface(stream);
mStore = do_QueryInterface(stream);
NS_RELEASE(stream);
}
//========================================================================================
// nsOutputStringStream
//========================================================================================
//----------------------------------------------------------------------------------------
nsOutputStringStream::nsOutputStringStream(char*& stringToChange)
//----------------------------------------------------------------------------------------
{
nsISupports* stream;
if (NS_FAILED(NS_NewCharOutputStream(&stream, &stringToChange)))
return;
mOutputStream = do_QueryInterface(stream);
mStore = do_QueryInterface(stream);
NS_RELEASE(stream);
}
//----------------------------------------------------------------------------------------
nsOutputStringStream::nsOutputStringStream(nsString& stringToChange)
//----------------------------------------------------------------------------------------
{
nsISupports* stream;
if (NS_FAILED(NS_NewStringOutputStream(&stream, stringToChange)))
return;
mOutputStream = do_QueryInterface(stream);
mStore = do_QueryInterface(stream);
NS_RELEASE(stream);
}
//========================================================================================
// nsInputFileStream
//========================================================================================
//----------------------------------------------------------------------------------------
nsInputFileStream::nsInputFileStream(
const nsFileSpec& inFile,
int nsprMode,
PRIntn accessMode)
//----------------------------------------------------------------------------------------
{
nsISupports* stream;
if (NS_FAILED(NS_NewIOFileStream(&stream, inFile, nsprMode, accessMode)))
return;
AssignFrom(stream);
NS_RELEASE(stream);
} // nsInputFileStream::nsInputFileStream
//----------------------------------------------------------------------------------------
nsInputFileStream::nsInputFileStream(nsIFileSpec* inSpec)
//----------------------------------------------------------------------------------------
{
nsIInputStream* stream;
if (NS_FAILED(inSpec->GetInputStream(&stream)))
return;
AssignFrom(stream);
NS_RELEASE(stream);
} // nsInputFileStream::nsInputFileStream
//----------------------------------------------------------------------------------------
nsInputFileStream::~nsInputFileStream()
//----------------------------------------------------------------------------------------
{
// if (is_open())
// close();
}
//----------------------------------------------------------------------------------------
void nsInputFileStream::AssignFrom(nsISupports* stream)
//----------------------------------------------------------------------------------------
{
mFile = do_QueryInterface(stream);
mInputStream = do_QueryInterface(stream);
mStore = do_QueryInterface(stream);
mFileInputStream = do_QueryInterface(stream);
}
//========================================================================================
// nsOutputFileStream
//========================================================================================
//----------------------------------------------------------------------------------------
nsOutputFileStream::nsOutputFileStream(nsIFileSpec* inSpec)
//----------------------------------------------------------------------------------------
{
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if (!inSpec)
return;
nsIOutputStream* stream;
if (NS_FAILED(inSpec->GetOutputStream(&stream)))
return;
AssignFrom(stream);
NS_RELEASE(stream);
}
//----------------------------------------------------------------------------------------
nsOutputFileStream::~nsOutputFileStream()
//----------------------------------------------------------------------------------------
{
// if (is_open())
// close();
}
//----------------------------------------------------------------------------------------
void nsOutputFileStream::AssignFrom(nsISupports* stream)
//----------------------------------------------------------------------------------------
{
mFile = do_QueryInterface(stream);
mOutputStream = do_QueryInterface(stream);
mStore = do_QueryInterface(stream);
mFileOutputStream = do_QueryInterface(stream);
}
//----------------------------------------------------------------------------------------
nsresult nsOutputFileStream::flush()
//----------------------------------------------------------------------------------------
{
if (mFileOutputStream)
mFileOutputStream->Flush();
return error();
}
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//----------------------------------------------------------------------------------------
void nsOutputFileStream::abort()
//----------------------------------------------------------------------------------------
{
mResult = NS_FILE_FAILURE;
close();
}
//========================================================================================
// nsSaveViaTempStream
//========================================================================================
//----------------------------------------------------------------------------------------
nsSaveViaTempStream::nsSaveViaTempStream(const nsFileSpec& inFileToSave)
//----------------------------------------------------------------------------------------
: mFileToSave(inFileToSave)
, mTempFileSpec(new nsFileSpec(inFileToSave))
{
// Make sure the temp file's unique (in particular, different from the target file)
mTempFileSpec->MakeUnique();
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open(*mTempFileSpec, (PR_WRONLY | PR_CREATE_FILE | PR_TRUNCATE), 0666);
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} // nsSaveViaTempStream::nsSaveViaTempStream
//----------------------------------------------------------------------------------------
void nsSaveViaTempStream::close()
//----------------------------------------------------------------------------------------
{
if (!mTempFileSpec)
return;
nsresult currentResult = mResult;
Inherited::close();
mResult = currentResult;
if (error())
{
mTempFileSpec->Delete(PR_FALSE);
}
else
{
nsFileSpec thirdSpec(mFileToSave);
thirdSpec.MakeUnique();
nsSimpleCharString originalName(mFileToSave.GetLeafName());
((nsFileSpec&)mFileToSave).Rename(nsSimpleCharString(thirdSpec.GetLeafName()));
if (NS_SUCCEEDED(mTempFileSpec->Rename(originalName)) && mTempFileSpec->Valid())
mFileToSave.Delete(PR_FALSE);
}
delete mTempFileSpec;
} // nsSaveViaTempStream::~nsSaveViaTempStream
//----------------------------------------------------------------------------------------
nsSaveViaTempStream::~nsSaveViaTempStream()
//----------------------------------------------------------------------------------------
{
delete mTempFileSpec;
} // nsSaveViaTempStream::~nsSaveViaTempStream
//========================================================================================
// Manipulators
//========================================================================================
//----------------------------------------------------------------------------------------
nsOutputStream& nsEndl(nsOutputStream& os)
//----------------------------------------------------------------------------------------
{
#if defined(XP_WIN) || defined(XP_OS2)
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os.write("\r\n", 2);
#elif defined (XP_MAC)
os.put('\r');
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#else
os.put('\n');
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#endif
//os.flush();
return os;
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} // nsEndl