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/* $Id: vfsiosmisc.cpp $ */
/** @file
* IPRT - Virtual File System, Misc I/O Stream Operations.
*/
/*
* Copyright (C) 2010 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
* VirtualBox OSE distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*/
/*******************************************************************************
* Header Files *
*******************************************************************************/
#include <iprt/vfs.h>
#include <iprt/vfslowlevel.h>
#include <iprt/err.h>
#include <iprt/string.h>
RTDECL(int) RTVfsIoStrmValidateUtf8Encoding(RTVFSIOSTREAM hVfsIos, uint32_t fFlags, PRTFOFF poffError)
{
/*
* Validate input.
*/
if (poffError)
{
AssertPtrReturn(poffError, VINF_SUCCESS);
*poffError = 0;
}
AssertReturn(!(fFlags & ~RTVFS_VALIDATE_UTF8_VALID_MASK), VERR_INVALID_PARAMETER);
/*
* The loop.
*/
char achBuf[1024 + 1];
size_t cbUsed = 0;
int rc;
for (;;)
{
/*
* Fill the buffer
*/
size_t cbRead = 0;
rc = RTVfsIoStrmRead(hVfsIos, &achBuf[cbUsed], sizeof(achBuf) - cbUsed - 1, true /*fBlocking*/, &cbRead);
if (RT_FAILURE(rc))
break;
cbUsed += cbRead;
if (!cbUsed)
{
Assert(rc == VINF_EOF);
break;
}
achBuf[sizeof(achBuf) - 1] = '\0';
/*
* Process the data in the buffer, maybe leaving the final chars till
* the next round.
*/
const char *pszCur = achBuf;
size_t offEnd = rc == VINF_EOF
? cbUsed
: cbUsed >= 7
? cbUsed - 7
: 0;
size_t off;
while ((off = (pszCur - &achBuf[0])) < offEnd)
{
RTUNICP uc;
rc = RTStrGetCpEx(&pszCur, &uc);
if (RT_FAILURE(rc))
break;
if (!uc)
{
if (fFlags & RTVFS_VALIDATE_UTF8_NO_NULL)
{
rc = VERR_INVALID_UTF8_ENCODING;
break;
}
}
else if (uc > 0x10ffff)
{
if (fFlags & RTVFS_VALIDATE_UTF8_BY_RTC_3629)
{
rc = VERR_INVALID_UTF8_ENCODING;
break;
}
}
}
if (off < cbUsed)
{
cbUsed -= off;
memmove(achBuf, pszCur, cbUsed);
}
}
/*
* Set the offset on failure.
*/
if (poffError && RT_FAILURE(rc))
{
}
return rc == VINF_EOF ? VINF_SUCCESS : rc;
}
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