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/* $Id: helpers.cpp $ */
/** @file
* COM helper functions for XPCOM
*/
/*
* Copyright (C) 2006-2020 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.
*/
#include "VBox/com/defs.h"
#include <nsMemory.h>
#include <iprt/assertcompile.h>
#include <iprt/utf16.h>
//
// OLE Automation string APIs
//
// Note: on Windows, every BSTR stores its length in the
// byte just before the pointer you get. If we do it like this,
// the caller cannot just use nsMemory::Free() on our strings.
// Therefore we'll try to implement it differently and hope that
// we don't run into problems.
/**
* Copies a string into a new memory block including the terminating UCS2 NULL.
*
* @param pwsz Source string to duplicate.
* @returns New BSTR string buffer.
*/
BSTR SysAllocString(const OLECHAR *pwszSrc)
{
AssertCompile(sizeof(*pwszSrc) == sizeof(PRUnichar));
if (pwszSrc)
return SysAllocStringLen(pwszSrc, RTUtf16Len((PCRTUTF16)pwszSrc));
return NULL;
}
/**
* Duplicates an ANSI string into a BSTR / allocates a BSTR with a size given in
* bytes.
*
* No conversion is done.
*
* @param pszSrc Source string to copy, optional.
* @param cbSrcReq Length of the source string / memory request in bytes.
* @returns new BSTR string buffer, NULL on failure.
*/
BSTR SysAllocStringByteLen(char const *pszSrc, unsigned int cbSrcReq)
{
BSTR pBstrNew = (BSTR)nsMemory::Alloc(RT_ALIGN_Z(cbSrcReq + sizeof(OLECHAR), sizeof(OLECHAR)));
AssertCompile(sizeof(*pBstrNew) == sizeof(OLECHAR));
if (pBstrNew)
{
if (!pszSrc)
memset(pBstrNew, 0, cbSrcReq + sizeof(OLECHAR));
else
{
// Copy the string and make sure it is terminated.
memcpy(pBstrNew, pszSrc, cbSrcReq);
char *pchTerminator = (char *)pBstrNew;
pchTerminator[cbSrcReq] = '\0';
pchTerminator[cbSrcReq + 1] = '\0';
}
}
return pBstrNew;
}
/**
* Duplicates a UTF-16 string into a BSTR / Allocates a BSTR with a size given
* in UTF-16 characters.
*
* @param pwszSrc Pointer to the source string, optional.
* @param cwcSrcReq Length of the source string / memory request in UTF-16
* characters.
* @returns new BSTR string buffer, NULL on failure.
*/
BSTR SysAllocStringLen(const OLECHAR *pwszSrc, unsigned int cwcSrcReq)
{
size_t const cbReq = (cwcSrcReq + 1) * sizeof(OLECHAR);
BSTR pBstrNew = (BSTR)nsMemory::Alloc(cbReq);
AssertCompile(sizeof(*pBstrNew) == sizeof(OLECHAR));
if (pBstrNew)
{
if (!pwszSrc)
memset(pBstrNew, 0, cbReq);
else
{
// Copy the string and make sure it is terminated.
memcpy(pBstrNew, pwszSrc, cbReq - sizeof(OLECHAR));
pBstrNew[cwcSrcReq] = L'\0';
}
}
return pBstrNew;
}
/**
* Frees the memory associated with the given BSTR.
*
* @param pBstr The string to free. NULL is ignored.
*/
void SysFreeString(BSTR pBstr)
{
if (pBstr)
nsMemory::Free(pBstr);
}
/**
* Duplicates @a pwszSrc into an exsting BSTR, adjust its size to make it fit.
*
* @param ppBstr The existing BSTR buffer pointer.
* @param pwszSrc Source string to copy. If NULL, the existing BSTR is freed.
* @returns success indicator (TRUE/FALSE)
*/
int SysReAllocString(BSTR *ppBstr, const OLECHAR *pwszSrc)
{
if (pwszSrc)
return SysReAllocStringLen(ppBstr, pwszSrc, RTUtf16Len((PCRTUTF16)pwszSrc));
SysFreeString(*ppBstr);
*ppBstr = NULL;
return 1;
}
/**
* Duplicates @a pwszSrc into an exsting BSTR / resizing an existing BSTR buffer
* into the given size (@a cwcSrcReq).
*
* @param ppBstr The existing BSTR buffer pointer.
* @param pwszSrc Source string to copy into the adjusted pbstr, optional.
* @param cwcSrcReq Length of the source string / request in UCS2
* characters, a zero terminator is always added.
* @returns success indicator (TRUE/FALSE)
*/
int SysReAllocStringLen(BSTR *ppBstr, const OLECHAR *pwszSrc, unsigned int cwcSrcReq)
{
BSTR pBstrOld = *ppBstr;
AssertCompile(sizeof(*pBstrOld) == sizeof(OLECHAR));
if (pBstrOld)
{
if ((BSTR)pwszSrc == pBstrOld)
pwszSrc = NULL;
size_t cbReq = (cwcSrcReq + 1) * sizeof(OLECHAR);
BSTR pBstrNew = (BSTR)nsMemory::Realloc(pBstrOld, cbReq);
if (pBstrNew)
{
if (pwszSrc)
memcpy(pBstrNew, pwszSrc, cbReq - sizeof(OLECHAR));
pBstrNew[cwcSrcReq] = L'\0';
*ppBstr = pBstrNew;
return 1;
}
}
else
{
// allocate a new string
*ppBstr = SysAllocStringLen(pwszSrc, cwcSrcReq);
if (*ppBstr)
return 1;
}
return 0;
}
/**
* Returns the string length in bytes without the terminator.
*
* @param pBstr The BSTR to get the byte length of.
* @returns String length in bytes.
*/
unsigned int SysStringByteLen(BSTR pBstr)
{
AssertCompile(sizeof(OLECHAR) == sizeof(*pBstr));
return RTUtf16Len(pBstr) * sizeof(OLECHAR);
}
/**
* Returns the string length in OLECHARs without the terminator.
*
* @param pBstr The BSTR to get the length of.
* @returns String length in OLECHARs.
*/
unsigned int SysStringLen(BSTR pBstr)
{
return RTUtf16Len(pBstr);
}
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