зеркало из https://github.com/mozilla/gecko-dev.git
670 строки
21 KiB
C++
670 строки
21 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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* Pierre Phaneuf <pp@ludusdesign.com>
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*/
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#include "nsIFileStream.h"
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#include "nsFileSpec.h"
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#include "nsCOMPtr.h"
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#include "prerror.h"
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#include "nsSegmentedBuffer.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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#ifdef XP_MAC
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#include <Errors.h>
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#include <iostream>
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#endif
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//========================================================================================
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class FileImpl
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: public nsIRandomAccessStore
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, public nsIFileOutputStream
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, public nsIFileInputStream
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, public nsIOpenFile
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//========================================================================================
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{
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public:
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FileImpl(PRFileDesc* inDesc);
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FileImpl(const nsFileSpec& inFile, int nsprMode, PRIntn accessMode);
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virtual ~FileImpl();
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// nsISupports interface
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NS_DECL_ISUPPORTS
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// nsIOpenFile interface
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NS_IMETHOD Open(const nsFileSpec& inFile, int nsprMode, PRIntn accessMode);
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NS_IMETHOD Close();
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NS_IMETHOD Seek(PRSeekWhence whence, PRInt32 offset);
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NS_IMETHOD GetIsOpen(PRBool* outOpen);
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NS_IMETHOD Tell(PRIntn* outWhere);
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// nsIInputStream interface
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NS_IMETHOD Available(PRUint32 *aLength);
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NS_IMETHOD Read(char* aBuf, PRUint32 aCount, PRUint32 *aReadCount);
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// nsIOutputStream interface
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NS_IMETHOD Write(const char* aBuf, PRUint32 aCount, PRUint32 *aWriteCount);
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NS_IMETHOD Flush();
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NS_IMETHOD GetAtEOF(PRBool* outAtEOF);
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NS_IMETHOD SetAtEOF(PRBool inAtEOF);
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protected:
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enum {
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kOuputBufferSegmentSize = 4096,
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kOuputBufferMaxSize = 4096
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};
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nsresult AllocateBuffers(PRUint32 segmentSize, PRUint32 maxSize);
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PRFileDesc* mFileDesc;
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int mNSPRMode;
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PRBool mFailed;
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PRBool mEOF;
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PRInt32 mLength;
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PRBool mGotBuffers;
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nsSegmentedBuffer mOutBuffer;
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char* mWriteCursor;
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char* mWriteLimit;
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}; // class FileImpl
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NS_IMPL_RELEASE(FileImpl)
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NS_IMPL_ADDREF(FileImpl)
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NS_IMPL_QUERY_HEAD(FileImpl)
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NS_IMPL_QUERY_BODY(nsIOpenFile)
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NS_IMPL_QUERY_BODY(nsIRandomAccessStore)
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NS_IMPL_QUERY_BODY(nsIOutputStream)
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NS_IMPL_QUERY_BODY(nsIInputStream)
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NS_IMPL_QUERY_BODY(nsIFileInputStream)
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NS_IMPL_QUERY_BODY(nsIFileOutputStream)
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if ( aIID.Equals(NS_GET_IID(nsIBaseStream)) )
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foundInterface = NS_STATIC_CAST(nsIBaseStream*, NS_STATIC_CAST(nsIOutputStream*, this));
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else
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NS_IMPL_QUERY_TAIL(nsIOutputStream)
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//----------------------------------------------------------------------------------------
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FileImpl::FileImpl(PRFileDesc* inDesc)
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//----------------------------------------------------------------------------------------
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: mFileDesc(inDesc)
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, mNSPRMode(0)
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, mFailed(PR_FALSE)
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, mEOF(PR_FALSE)
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, mLength(-1)
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, mGotBuffers(PR_FALSE)
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{
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NS_INIT_REFCNT();
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mWriteCursor = nsnull;
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mWriteLimit = nsnull;
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}
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//----------------------------------------------------------------------------------------
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FileImpl::FileImpl(const nsFileSpec& inFile, int nsprMode, PRIntn accessMode)
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//----------------------------------------------------------------------------------------
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: mFileDesc(nsnull)
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, mNSPRMode(-1)
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, mFailed(PR_FALSE)
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, mEOF(PR_FALSE)
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, mLength(-1)
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, mGotBuffers(PR_FALSE)
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{
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NS_INIT_REFCNT();
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mWriteCursor = nsnull;
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mWriteLimit = nsnull;
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nsresult rv = Open(inFile, nsprMode, accessMode); // this sets nsprMode
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if (NS_FAILED(rv))
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{
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#if DEBUG
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char *fileName = inFile.GetLeafName();
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printf("Opening file %s failed\n", fileName);
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nsCRT::free(fileName);
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#endif
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}
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}
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//----------------------------------------------------------------------------------------
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FileImpl::~FileImpl()
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//----------------------------------------------------------------------------------------
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{
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nsresult rv = Close();
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NS_ASSERTION(NS_SUCCEEDED(rv), "Close failed");
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}
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//----------------------------------------------------------------------------------------
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NS_IMETHODIMP FileImpl::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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{
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if (mFileDesc)
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if ((nsprMode & mNSPRMode) == nsprMode)
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return NS_OK;
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else
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return NS_FILE_RESULT(PR_ILLEGAL_ACCESS_ERROR);
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const int nspr_modes[]={
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PR_WRONLY | PR_CREATE_FILE,
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PR_WRONLY | PR_CREATE_FILE | PR_APPEND,
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PR_WRONLY | PR_CREATE_FILE | PR_TRUNCATE,
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PR_RDONLY,
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PR_RDONLY | PR_APPEND,
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PR_RDWR | PR_CREATE_FILE,
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PR_RDWR | PR_CREATE_FILE | PR_TRUNCATE,
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// "wb",
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// "ab",
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// "wb",
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// "rb",
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// "r+b",
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// "w+b",
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0 };
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const int* currentLegalMode = nspr_modes;
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while (*currentLegalMode && nsprMode != *currentLegalMode)
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++currentLegalMode;
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if (!*currentLegalMode)
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return NS_FILE_RESULT(PR_ILLEGAL_ACCESS_ERROR);
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#ifdef XP_MAC
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// Use the file spec to open the file, because one path can be common to
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// several files on the Macintosh (you can have several volumes with the
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// same name, see).
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mFileDesc = 0;
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OSErr err = inFile.Error();
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if (err != noErr)
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if (err != fnfErr || !(nsprMode & PR_CREATE_FILE))
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return NS_FILE_RESULT(inFile.Error());
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err = noErr;
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#if DEBUG
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const OSType kCreator = 'CWIE';
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#else
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const OSType kCreator = 'MOSS';
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#endif
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// Resolve the alias to the original file.
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nsFileSpec original = inFile;
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PRBool ignoredResult;
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original.ResolveSymlink(ignoredResult);
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const FSSpec& spec = original.operator const FSSpec&();
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if (nsprMode & PR_CREATE_FILE)
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err = FSpCreate(&spec, kCreator, 'TEXT', 0);
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if (err == dupFNErr)
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err = noErr;
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if (err != noErr)
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return NS_FILE_RESULT(err);
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SInt8 perm;
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if (nsprMode & PR_RDWR)
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perm = fsRdWrPerm;
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else if (nsprMode & PR_WRONLY)
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perm = fsWrPerm;
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else
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perm = fsRdPerm;
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short refnum;
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err = FSpOpenDF(&spec, perm, &refnum);
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if (err == noErr && (nsprMode & PR_TRUNCATE))
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err = SetEOF(refnum, 0);
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if (err == noErr && (nsprMode & PR_APPEND))
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err = SetFPos(refnum, fsFromLEOF, 0);
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if (err != noErr)
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return NS_FILE_RESULT(err);
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if ((mFileDesc = PR_ImportFile(refnum)) == 0)
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return NS_FILE_RESULT(PR_GetError());
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#else
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// Platforms other than Macintosh...
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// Another bug in NSPR: Mac PR_Open assumes a unix style path, but Win PR_Open assumes
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// a windows path.
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if ((mFileDesc = PR_Open((const char*)nsFileSpec(inFile), nsprMode, accessMode)) == 0)
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return NS_FILE_RESULT(PR_GetError());
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#endif
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mNSPRMode = nsprMode;
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mLength = PR_Available(mFileDesc);
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return NS_OK;
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} // FileImpl::Open
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//----------------------------------------------------------------------------------------
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NS_IMETHODIMP FileImpl::Available(PRUint32 *aLength)
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//----------------------------------------------------------------------------------------
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{
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NS_PRECONDITION(aLength != nsnull, "null ptr");
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if (!aLength)
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return NS_ERROR_NULL_POINTER;
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if (mLength < 0)
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return NS_ERROR_UNEXPECTED;
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*aLength = mLength;
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return NS_OK;
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}
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//----------------------------------------------------------------------------------------
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NS_IMETHODIMP FileImpl::GetIsOpen(PRBool* outOpen)
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//----------------------------------------------------------------------------------------
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{
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*outOpen = (mFileDesc != nsnull);
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return NS_OK;
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}
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//----------------------------------------------------------------------------------------
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NS_IMETHODIMP FileImpl::Seek(PRSeekWhence whence, PRInt32 offset)
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//----------------------------------------------------------------------------------------
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{
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if (mFileDesc==PR_STDIN || mFileDesc==PR_STDOUT || mFileDesc==PR_STDERR || !mFileDesc)
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return NS_FILE_RESULT(PR_BAD_DESCRIPTOR_ERROR);
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mFailed = PR_FALSE; // reset on a seek.
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mEOF = PR_FALSE; // reset on a seek.
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// To avoid corruption, we flush during a seek. see bug number 18949
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Flush();
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PRInt32 position = PR_Seek(mFileDesc, 0, PR_SEEK_CUR);
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PRInt32 available = PR_Available(mFileDesc);
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PRInt32 fileSize = position + available;
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PRInt32 newPosition = 0;
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switch (whence)
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{
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case PR_SEEK_CUR: newPosition = position + offset; break;
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case PR_SEEK_SET: newPosition = offset; break;
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case PR_SEEK_END: newPosition = fileSize + offset; break;
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}
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if (newPosition < 0)
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{
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newPosition = 0;
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mFailed = PR_TRUE;
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}
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if (newPosition >= fileSize) // nb: not "else if".
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{
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newPosition = fileSize;
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mEOF = PR_TRUE;
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}
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if (PR_Seek(mFileDesc, newPosition, PR_SEEK_SET) < 0)
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mFailed = PR_TRUE;
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return NS_OK;
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} // FileImpl::Seek
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//----------------------------------------------------------------------------------------
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NS_IMETHODIMP FileImpl::Read(char* aBuf, PRUint32 aCount, PRUint32 *aReadCount)
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//----------------------------------------------------------------------------------------
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{
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NS_PRECONDITION(aBuf != nsnull, "null ptr");
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if (!aBuf)
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return NS_ERROR_NULL_POINTER;
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NS_PRECONDITION(aReadCount != nsnull, "null ptr");
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if (!aReadCount)
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return NS_ERROR_NULL_POINTER;
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if (!mFileDesc)
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return NS_FILE_RESULT(PR_BAD_DESCRIPTOR_ERROR);
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if (mFailed)
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return NS_ERROR_FAILURE;
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PRInt32 bytesRead = PR_Read(mFileDesc, aBuf, aCount);
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if (bytesRead < 0)
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{
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*aReadCount = 0;
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mFailed = PR_TRUE;
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return NS_FILE_RESULT(PR_GetError());
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}
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else if (bytesRead == 0)
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{
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mEOF = PR_TRUE;
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}
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*aReadCount = bytesRead;
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return NS_OK;
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}
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//----------------------------------------------------------------------------------------
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NS_IMETHODIMP FileImpl::Write(const char* aBuf, PRUint32 aCount, PRUint32 *aWriteCount)
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//----------------------------------------------------------------------------------------
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{
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NS_PRECONDITION(aBuf != nsnull, "null ptr");
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NS_PRECONDITION(aWriteCount != nsnull, "null ptr");
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*aWriteCount = 0;
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#ifdef XP_MAC
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// Calling PR_Write on stdout is sure suicide.
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if (mFileDesc == PR_STDOUT || mFileDesc == PR_STDERR)
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{
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cout.write(aBuf, aCount);
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*aWriteCount = aCount;
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return NS_OK;
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}
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#endif
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if (!mFileDesc)
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return NS_FILE_RESULT(PR_BAD_DESCRIPTOR_ERROR);
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if (mFailed)
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return NS_ERROR_FAILURE;
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if (!mGotBuffers)
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{
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nsresult rv = AllocateBuffers(kOuputBufferSegmentSize, kOuputBufferMaxSize);
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if (NS_FAILED(rv))
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return rv; // try to write non-buffered?
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}
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PRUint32 bufOffset = 0;
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PRUint32 currentWrite = 0;
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while (aCount > 0)
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{
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if (mWriteCursor == nsnull || mWriteCursor == mWriteLimit)
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{
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char* seg = mOutBuffer.AppendNewSegment();
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if (seg == nsnull)
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{
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// buffer is full, try again
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Flush();
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seg = mOutBuffer.AppendNewSegment();
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if (seg == nsnull)
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return NS_ERROR_OUT_OF_MEMORY;
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}
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mWriteCursor = seg;
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mWriteLimit = seg + mOutBuffer.GetSegmentSize();
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}
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// move
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currentWrite = mWriteLimit - mWriteCursor;
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if (aCount < currentWrite)
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currentWrite = aCount;
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memcpy(mWriteCursor, (aBuf + bufOffset), currentWrite);
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mWriteCursor += currentWrite;
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aCount -= currentWrite;
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bufOffset += currentWrite;
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*aWriteCount += currentWrite;
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}
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return NS_OK;
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}
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//----------------------------------------------------------------------------------------
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NS_IMETHODIMP FileImpl::Tell(PRIntn* outWhere)
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//----------------------------------------------------------------------------------------
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{
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if (mFileDesc==PR_STDIN || mFileDesc==PR_STDOUT || mFileDesc==PR_STDERR || !mFileDesc)
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return NS_FILE_RESULT(PR_BAD_DESCRIPTOR_ERROR);
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*outWhere = PR_Seek(mFileDesc, 0, PR_SEEK_CUR);
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return NS_OK;
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} // FileImpl::Tell
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//----------------------------------------------------------------------------------------
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NS_IMETHODIMP FileImpl::Close()
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//----------------------------------------------------------------------------------------
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{
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if ((mNSPRMode & PR_RDONLY) == 0)
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Flush();
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if (mFileDesc==PR_STDIN || mFileDesc==PR_STDOUT || mFileDesc==PR_STDERR || !mFileDesc)
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return NS_OK;
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if (PR_Close(mFileDesc) == PR_SUCCESS)
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mFileDesc = 0;
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else
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return NS_FILE_RESULT(PR_GetError());
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return NS_OK;
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} // FileImpl::close
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//----------------------------------------------------------------------------------------
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NS_IMETHODIMP FileImpl::Flush()
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//----------------------------------------------------------------------------------------
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{
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#ifdef XP_MAC
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if (mFileDesc == PR_STDOUT || mFileDesc == PR_STDERR)
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{
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cout.flush();
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return NS_OK;
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}
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#endif
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if (!mFileDesc)
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return NS_FILE_RESULT(PR_BAD_DESCRIPTOR_ERROR);
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PRInt32 segCount = mOutBuffer.GetSegmentCount();
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PRUint32 segSize = mOutBuffer.GetSegmentSize();
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for (PRInt32 i = 0; i < segCount; i++)
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{
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char* seg = mOutBuffer.GetSegment(i);
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// if it is the last buffer, it may not be completely full.
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if(i == (segCount-1))
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segSize = (mWriteCursor - seg);
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PRInt32 bytesWrit = PR_Write(mFileDesc, seg, segSize);
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if (bytesWrit != (PRInt32)segSize)
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{
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mFailed = PR_TRUE;
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return NS_FILE_RESULT(PR_GetError());
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}
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}
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if (mGotBuffers)
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mOutBuffer.Empty();
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mWriteCursor = nsnull;
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mWriteLimit = nsnull;
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#ifdef XP_MAC
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// On unix, it seems to fail always.
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if (PR_Sync(mFileDesc) != PR_SUCCESS)
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mFailed = PR_TRUE;
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#endif
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return NS_OK;
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} // FileImpl::flush
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//----------------------------------------------------------------------------------------
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NS_IMETHODIMP FileImpl::GetAtEOF(PRBool* outAtEOF)
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//----------------------------------------------------------------------------------------
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{
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*outAtEOF = mEOF;
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return NS_OK;
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}
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//----------------------------------------------------------------------------------------
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NS_IMETHODIMP FileImpl::SetAtEOF(PRBool inAtEOF)
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//----------------------------------------------------------------------------------------
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{
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mEOF = inAtEOF;
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return NS_OK;
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}
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//----------------------------------------------------------------------------------------
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nsresult FileImpl::AllocateBuffers(PRUint32 segmentSize, PRUint32 maxBufSize)
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//----------------------------------------------------------------------------------------
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{
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nsresult rv = mOutBuffer.Init(segmentSize, maxBufSize);
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if (NS_SUCCEEDED(rv))
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mGotBuffers = PR_TRUE;
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return rv;
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}
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//----------------------------------------------------------------------------------------
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NS_COM nsresult NS_NewTypicalInputFileStream(
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nsISupports** aResult,
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const nsFileSpec& inFile
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/*Default nsprMode == PR_RDONLY*/
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/*Default accessmode = 0700 (octal)*/)
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// Factory method to get an nsInputStream from a file, using most common options
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//----------------------------------------------------------------------------------------
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{
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// This QueryInterface was needed because NS_NewIOFileStream
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// does a cast from (void *) to (nsISupports *) thus causing a
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// vtable problem on Windows, where we really didn't have the proper pointer
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// to an nsIInputStream, this ensures that we do
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#if 1
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nsISupports * supports;
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nsIInputStream * inStr;
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nsresult rv = NS_NewIOFileStream(&supports, inFile, PR_RDONLY, 0700);
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|
*aResult = nsnull;
|
|
if (NS_SUCCEEDED(rv)) {
|
|
if (NS_SUCCEEDED(supports->QueryInterface(NS_GET_IID(nsIInputStream), (void**)&inStr))) {
|
|
*aResult = inStr;
|
|
}
|
|
NS_RELEASE(supports);
|
|
}
|
|
return rv;
|
|
#else
|
|
return NS_NewIOFileStream(aResult, inFile, PR_RDONLY, 0700);
|
|
#endif
|
|
}
|
|
|
|
//----------------------------------------------------------------------------------------
|
|
NS_COM nsresult NS_NewOutputConsoleStream(
|
|
nsISupports** aResult)
|
|
// Factory method to get an nsOutputStream to the console.
|
|
//----------------------------------------------------------------------------------------
|
|
{
|
|
NS_PRECONDITION(aResult != nsnull, "null ptr");
|
|
if (! aResult)
|
|
return NS_ERROR_NULL_POINTER;
|
|
|
|
FileImpl* stream = new FileImpl(PR_STDOUT);
|
|
if (! stream)
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
|
|
NS_ADDREF(stream);
|
|
*aResult = (nsISupports*)(void*)stream;
|
|
return NS_OK;
|
|
}
|
|
|
|
//----------------------------------------------------------------------------------------
|
|
NS_COM nsresult NS_NewTypicalOutputFileStream(
|
|
nsISupports** aResult,
|
|
const nsFileSpec& inFile
|
|
/*default nsprMode= (PR_WRONLY | PR_CREATE_FILE | PR_TRUNCATE)*/
|
|
/*Default accessMode= 0700 (octal)*/)
|
|
// Factory method to get an nsOutputStream to a file - most common case.
|
|
//----------------------------------------------------------------------------------------
|
|
{
|
|
// This QueryInterface was needed because NS_NewIOFileStream
|
|
// does a cast from (void *) to (nsISupports *) thus causing a
|
|
// vtable problem on Windows, where we really didn't have the proper pointer
|
|
// to an nsIOutputStream, this ensures that we do
|
|
#if 1
|
|
/* nsISupports * supports;
|
|
nsIOutputStream * outStr;
|
|
|
|
nsresult rv = NS_NewIOFileStream(
|
|
&supports,
|
|
inFile,
|
|
(PR_WRONLY | PR_CREATE_FILE | PR_TRUNCATE),
|
|
0700);
|
|
|
|
*aResult = nsnull;
|
|
if (NS_SUCCEEDED(rv)) {
|
|
if (NS_SUCCEEDED(supports->QueryInterface(NS_GET_IID(nsIOutputStream), (void**)&outStr))) {
|
|
*aResult = outStr;
|
|
}
|
|
NS_RELEASE(supports);
|
|
}
|
|
return rv;
|
|
*/
|
|
|
|
nsCOMPtr<nsISupports> supports;
|
|
nsIOutputStream * outStr;
|
|
|
|
nsresult rv = NS_NewIOFileStream(
|
|
getter_AddRefs(supports),
|
|
inFile,
|
|
(PR_WRONLY | PR_CREATE_FILE | PR_TRUNCATE),
|
|
0700);
|
|
|
|
*aResult = nsnull;
|
|
if (NS_SUCCEEDED(rv)) {
|
|
if (NS_SUCCEEDED(supports->QueryInterface(NS_GET_IID(nsIOutputStream), (void**)&outStr))) {
|
|
*aResult = outStr;
|
|
}
|
|
}
|
|
return rv;
|
|
#else
|
|
return NS_NewIOFileStream(
|
|
aResult,
|
|
inFile,
|
|
(PR_WRONLY | PR_CREATE_FILE | PR_TRUNCATE),
|
|
0700);
|
|
#endif
|
|
}
|
|
|
|
//----------------------------------------------------------------------------------------
|
|
NS_COM nsresult NS_NewIOFileStream(
|
|
nsISupports** aResult,
|
|
const nsFileSpec& inFile,
|
|
PRInt32 nsprMode /*default = (PR_WRONLY | PR_CREATE_FILE | PR_TRUNCATE)*/,
|
|
PRInt32 accessMode /*Default = 0700 (octal)*/)
|
|
// Factory method to get an object that implements both nsIInputStream
|
|
// and nsIOutputStream, associated with a file.
|
|
//----------------------------------------------------------------------------------------
|
|
{
|
|
NS_PRECONDITION(aResult != nsnull, "null ptr");
|
|
if (!aResult)
|
|
return NS_ERROR_NULL_POINTER;
|
|
|
|
FileImpl* stream = new FileImpl(inFile, nsprMode, accessMode);
|
|
if (! stream)
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
|
|
NS_ADDREF(stream);
|
|
*aResult = (nsISupports*)(void*)stream;
|
|
return NS_OK;
|
|
}
|
|
|
|
//----------------------------------------------------------------------------------------
|
|
NS_COM nsresult NS_NewTypicalIOFileStream(
|
|
nsISupports** aResult,
|
|
const nsFileSpec& inFile
|
|
/*default nsprMode= (PR_RDWR | PR_CREATE_FILE)*/
|
|
/*Default accessMode= 0700 (octal)*/)
|
|
// Factory method to get an object that implements both nsIInputStream
|
|
// and nsIOutputStream, associated with a single file.
|
|
//----------------------------------------------------------------------------------------
|
|
{
|
|
return NS_NewIOFileStream(
|
|
aResult,
|
|
inFile,
|
|
(PR_RDWR | PR_CREATE_FILE),
|
|
0700);
|
|
}
|