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/* $Id: vfsiosmisc.cpp $ */
/** @file
* IPRT - Virtual File System, Misc I/O Stream Operations.
*/
/*
* Copyright (C) 2010-2019 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/mem.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;
}
/** Header size. */
#define READ_ALL_HEADER_SIZE 0x20
/** The header magic. It's followed by the size (both size_t). */
#define READ_ALL_HEADER_MAGIC UINT32_C(0x11223355)
RTDECL(int) RTVfsIoStrmReadAll(RTVFSIOSTREAM hVfsIos, void **ppvBuf, size_t *pcbBuf)
{
/*
* Try query the object information and in case the stream has a known
* size we could use for guidance.
*/
RTFSOBJINFO ObjInfo;
int rc = RTVfsIoStrmQueryInfo(hVfsIos, &ObjInfo, RTFSOBJATTRADD_NOTHING);
size_t cbAllocated = RT_SUCCESS(rc) && ObjInfo.cbObject > 0 && ObjInfo.cbObject < _1G
? (size_t)ObjInfo.cbObject + 1 : _16K;
cbAllocated += READ_ALL_HEADER_SIZE;
void *pvBuf = RTMemAlloc(cbAllocated);
if (pvBuf)
{
memset(pvBuf, 0xfe, READ_ALL_HEADER_SIZE);
size_t off = 0;
for (;;)
{
/*
* Handle buffer growing and detecting the end of it all.
*/
size_t cbToRead = cbAllocated - off - READ_ALL_HEADER_SIZE - 1;
if (!cbToRead)
{
/* The end? */
uint8_t bIgn;
size_t cbIgn;
rc = RTVfsIoStrmRead(hVfsIos, &bIgn, 0, true /*fBlocking*/, &cbIgn);
if (rc == VINF_EOF)
break;
/* Grow the buffer. */
cbAllocated -= READ_ALL_HEADER_SIZE - 1;
cbAllocated = RT_MAX(RT_MIN(cbAllocated, _32M), _1K);
cbAllocated = RT_ALIGN_Z(cbAllocated, _4K);
cbAllocated += READ_ALL_HEADER_SIZE + 1;
void *pvNew = RTMemRealloc(pvBuf, cbAllocated);
AssertBreakStmt(pvNew, rc = VERR_NO_MEMORY);
pvBuf = pvNew;
cbToRead = cbAllocated - off - READ_ALL_HEADER_SIZE - 1;
}
Assert(cbToRead < cbAllocated);
/*
* Read.
*/
size_t cbActual;
rc = RTVfsIoStrmRead(hVfsIos, (uint8_t *)pvBuf + READ_ALL_HEADER_SIZE + off, cbToRead,
true /*fBlocking*/, &cbActual);
if (RT_FAILURE(rc))
break;
Assert(cbActual > 0);
Assert(cbActual <= cbToRead);
off += cbActual;
if (rc == VINF_EOF)
break;
}
Assert(rc != VERR_EOF);
if (RT_SUCCESS(rc))
{
((size_t *)pvBuf)[0] = READ_ALL_HEADER_MAGIC;
((size_t *)pvBuf)[1] = off;
((uint8_t *)pvBuf)[READ_ALL_HEADER_SIZE + off] = 0;
*ppvBuf = (uint8_t *)pvBuf + READ_ALL_HEADER_SIZE;
*pcbBuf = off;
return VINF_SUCCESS;
}
RTMemFree(pvBuf);
}
else
rc = VERR_NO_MEMORY;
*ppvBuf = NULL;
*pcbBuf = 0;
return rc;
}
RTDECL(void) RTVfsIoStrmReadAllFree(void *pvBuf, size_t cbBuf)
{
AssertPtrReturnVoid(pvBuf);
/* Spool back to the start of the header. */
pvBuf = (uint8_t *)pvBuf - READ_ALL_HEADER_SIZE;
/* Make sure the caller isn't messing with us. Hardcoded, but works. */
Assert(((size_t *)pvBuf)[0] == READ_ALL_HEADER_MAGIC);
Assert(((size_t *)pvBuf)[1] == cbBuf); RT_NOREF_PV(cbBuf);
/* Free it. */
RTMemFree(pvBuf);
}
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