coreclr/src/utilcode/sstring_com.cpp at master · dotnet/coreclr · GitHub

Name: coreclr/src/utilcode/sstring_com.cpp at master · dotnet/coreclr · GitHub
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
// ---------------------------------------------------------------------------
// SString_COM.cpp

// ---------------------------------------------------------------------------

#include"stdafx.h"
#include"sstring.h"
#include"ex.h"
#include"holder.h"

#defineDEFAULT_RESOURCE_STRING_SIZE255

//----------------------------------------------------------------------------
// Load the string resource into this string.
//----------------------------------------------------------------------------
BOOL SString::LoadResource(CCompRC::ResourceCategory eCategory, int resourceID)
{
returnSUCCEEDED(LoadResourceAndReturnHR(eCategory, resourceID));
}

HRESULT SString::LoadResourceAndReturnHR(CCompRC::ResourceCategory eCategory, int resourceID)
{
 WRAPPER_NO_CONTRACT;
returnLoadResourceAndReturnHR(NULL, eCategory,resourceID);
}

HRESULT SString::LoadResourceAndReturnHR(CCompRC* pResourceDLL, CCompRC::ResourceCategory eCategory, int resourceID)
{
CONTRACT(BOOL)
 {
 INSTANCE_CHECK;
 NOTHROW;
 }
 CONTRACT_END;

 HRESULT hr = E_FAIL;

#ifndef FEATURE_UTILCODE_NO_DEPENDENCIES
if (pResourceDLL == NULL)
 {
 pResourceDLL = CCompRC::GetDefaultResourceDll();
 }

if (pResourceDLL != NULL)
 {

int size = 0;

 EX_TRY
 {
if (GetRawCount() == 0)
Resize(DEFAULT_RESOURCE_STRING_SIZE, REPRESENTATION_UNICODE);

while (TRUE)
 {
// First try and load the string in the amount of space that we have.
// In fatal error reporting scenarios, we may not have enough memory to
// allocate a larger buffer.

 hr = pResourceDLL->LoadString(eCategory, resourceID, GetRawUnicode(), GetRawCount()+1, &size);
if (hr != HRESULT_FROM_WIN32(ERROR_INSUFFICIENT_BUFFER))
 {
if (FAILED(hr))
 {
Clear();
break;
 }

// Although we cannot generally detect truncation, we can tell if we
// used up all the space (in which case we will assume truncation.)
if (size < (int)GetRawCount())
 {
break;
 }
 }

// Double the size and try again.
Resize(size*2, REPRESENTATION_UNICODE);

 }

if (SUCCEEDED(hr))
 {
Truncate(Begin() + (COUNT_T) wcslen(GetRawUnicode()));
 }

Normalize();

 }
 EX_CATCH
 {
 hr = E_FAIL;
 }
EX_END_CATCH(SwallowAllExceptions);
 }
#endif//!FEATURE_UTILCODE_NO_DEPENDENCIES

 RETURN hr;
} // SString::LoadResourceAndReturnHR