mirror of
https://github.com/mozilla/gecko-dev.git
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131 lines
4.3 KiB
C++
131 lines
4.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla code.
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*
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* The Initial Developer of the Original Code is
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* Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2010
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Taras Glek <tglek@mozilla.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#if defined(XP_UNIX)
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#elif defined(XP_WIN)
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#include <windows.h>
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#elif defined(XP_OS2)
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#define INCL_DOSFILEMGR
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#include <os2.h>
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#endif
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#include "nscore.h"
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#include "private/pprio.h"
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#include "mozilla/FileUtils.h"
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#include "mozilla/FunctionTimer.h"
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bool
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mozilla::fallocate(PRFileDesc *aFD, PRInt64 aLength)
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{
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NS_TIME_FUNCTION;
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#if defined(HAVE_POSIX_FALLOCATE)
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return posix_fallocate(PR_FileDesc2NativeHandle(aFD), 0, aLength) == 0;
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#elif defined(XP_WIN)
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PROffset64 oldpos = PR_Seek64(aFD, 0, PR_SEEK_CUR);
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if (oldpos == -1)
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return false;
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if (PR_Seek64(aFD, aLength, PR_SEEK_SET) != aLength)
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return false;
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bool retval = (0 != SetEndOfFile((HANDLE)PR_FileDesc2NativeHandle(aFD)));
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PR_Seek64(aFD, oldpos, PR_SEEK_SET);
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return retval;
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#elif defined(XP_OS2)
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return aLength <= PR_UINT32_MAX
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&& 0 == DosSetFileSize(PR_FileDesc2NativeHandle(aFD), (PRUint32)aLength);
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#elif defined(XP_MACOSX)
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int fd = PR_FileDesc2NativeHandle(aFD);
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fstore_t store = {F_ALLOCATECONTIG, F_PEOFPOSMODE, 0, aLength};
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// Try to get a continous chunk of disk space
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int ret = fcntl(fd, F_PREALLOCATE, &store);
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if (-1 == ret) {
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// OK, perhaps we are too fragmented, allocate non-continuous
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store.fst_flags = F_ALLOCATEALL;
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ret = fcntl(fd, F_PREALLOCATE, &store);
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if (-1 == ret)
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return false;
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}
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return 0 == ftruncate(fd, aLength);
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#elif defined(XP_UNIX)
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// The following is copied from fcntlSizeHint in sqlite
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/* If the OS does not have posix_fallocate(), fake it. First use
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** ftruncate() to set the file size, then write a single byte to
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** the last byte in each block within the extended region. This
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** is the same technique used by glibc to implement posix_fallocate()
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** on systems that do not have a real fallocate() system call.
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*/
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PROffset64 oldpos = PR_Seek64(aFD, 0, PR_SEEK_CUR);
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if (oldpos == -1)
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return false;
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struct stat buf;
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int fd = PR_FileDesc2NativeHandle(aFD);
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if (fstat(fd, &buf))
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return false;
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if (buf.st_size >= aLength)
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return false;
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const int nBlk = buf.st_blksize;
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if (!nBlk)
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return false;
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if (ftruncate(fd, aLength))
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return false;
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int nWrite; // Return value from write()
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PRInt64 iWrite = ((buf.st_size + 2 * nBlk - 1) / nBlk) * nBlk - 1; // Next offset to write to
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do {
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nWrite = 0;
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if (PR_Seek64(aFD, iWrite, PR_SEEK_SET) == iWrite)
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nWrite = PR_Write(aFD, "", 1);
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iWrite += nBlk;
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} while (nWrite == 1 && iWrite < aLength);
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PR_Seek64(aFD, oldpos, PR_SEEK_SET);
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return nWrite == 1;
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#endif
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return false;
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}
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