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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.
// ---------------------------------------------------------------------------
// FString.cpp
//
// ---------------------------------------------------------------------------
#include "stdafx.h"
#include "ex.h"
#include "holder.h"
#include "fstring.h"
namespace FString
{
#ifdef _MSC_VER
#pragma optimize("t", on)
#endif // _MSC_VER
#define MAX_LENGTH 0x1fffff00
HRESULT Unicode_Utf8_Length(__in_z LPCWSTR pString, __out bool * pAllAscii, __out DWORD * pLength)
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
}
CONTRACTL_END;
* pAllAscii = true;
LPCWSTR p = pString;
while (true)
{
WCHAR ch = * p;
// Single check for termination and non ASCII
if (((unsigned) (ch - 1)) >= 0x7F)
{
if (ch != 0)
{
* pAllAscii = false;
}
break;
}
p ++;
}
if (* pAllAscii)
{
if ((p - pString) > MAX_LENGTH)
{
return COR_E_OVERFLOW;
}
* pLength = (DWORD) (p - pString);
}
else // use WideCharToMultiByte to calculate result length
{
* pLength = WszWideCharToMultiByte(CP_UTF8, 0, pString, -1, NULL, 0, NULL, NULL);
if (*pLength == 0)
{
return HRESULT_FROM_GetLastError();
}
// Remove the count of null terminator, to be consistent with the all-ASCII case.
--*pLength;
if (*pLength > MAX_LENGTH)
{
return COR_E_OVERFLOW;
}
}
return S_OK;
}
// UNICODE to UTF8
HRESULT Unicode_Utf8(__in_z LPCWSTR pString, bool allAscii, __out_z LPSTR pBuffer, DWORD length)
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
}
CONTRACTL_END;
pBuffer[length] = 0;
if (allAscii)
{
LPCWSTR p = pString;
LPSTR q = pBuffer;
LPCWSTR endP = p + length - 8;
// Unfold to optimize for long string: 8 chars per iteration
while (p < endP)
{
q[0] = (char) p[0];
q[1] = (char) p[1];
q[2] = (char) p[2];
q[3] = (char) p[3];
q[4] = (char) p[4];
q[5] = (char) p[5];
q[6] = (char) p[6];
q[7] = (char) p[7];
q += 8;
p += 8;
}
endP += 8;
while (p < endP)
{
* q ++ = (char) * p ++;
}
}
else
{
length = WszWideCharToMultiByte(CP_UTF8, 0, pString, -1, pBuffer, (int) length + 1, NULL, NULL);
if (length == 0)
{
return HRESULT_FROM_GetLastError();
}
}
return S_OK;
}
HRESULT Utf8_Unicode_Length(__in_z LPCSTR pString, __out bool * pAllAscii, __out DWORD * pLength)
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
}
CONTRACTL_END;
* pAllAscii = true;
LPCSTR p = pString;
while (true)
{
char ch = * p;
// Single check for termination and non ASCII
if (((unsigned) (ch - 1)) >= 0x7F)
{
if (ch != 0)
{
* pAllAscii = false;
}
break;
}
p ++;
}
if (* pAllAscii)
{
if ((p - pString) > MAX_LENGTH)
{
return COR_E_OVERFLOW;
}
* pLength = (DWORD)(p - pString);
}
else
{
* pLength = WszMultiByteToWideChar(CP_UTF8, 0, pString, -1, NULL, 0);
if (* pLength == 0)
{
return HRESULT_FROM_GetLastError();
}
// Remove the count of null terminator, to be consistent with the all-ASCII case.
--*pLength;
if (* pLength > MAX_LENGTH)
{
return COR_E_OVERFLOW;
}
}
return S_OK;
}
// UTF8 to Unicode
HRESULT Utf8_Unicode(__in_z LPCSTR pString, bool allAscii, __out_z LPWSTR pBuffer, DWORD length)
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
}
CONTRACTL_END;
pBuffer[length] = 0;
if (allAscii)
{
LPCSTR p = pString;
LPWSTR q = pBuffer;
LPCSTR endP = p + length - 8;
// Unfold to optimize for long string: 4 chars per iteration
while (p < endP)
{
q[0] = (WCHAR) p[0];
q[1] = (WCHAR) p[1];
q[2] = (WCHAR) p[2];
q[3] = (WCHAR) p[3];
q[4] = (WCHAR) p[4];
q[5] = (WCHAR) p[5];
q[6] = (WCHAR) p[6];
q[7] = (WCHAR) p[7];
q += 8;
p += 8;
}
endP += 8;
while (p < endP)
{
* q ++ = (WCHAR) * p ++;
}
}
else
{
length = WszMultiByteToWideChar(CP_UTF8, 0, pString, -1, pBuffer, (int) length + 1);
if (length == 0)
{
return HRESULT_FROM_GetLastError();
}
}
return S_OK;
}
HRESULT ConvertUnicode_Utf8(__in_z LPCWSTR pString, __out_z LPSTR * pBuffer)
{
bool allAscii;
DWORD length;
HRESULT hr = Unicode_Utf8_Length(pString, & allAscii, & length);
if (SUCCEEDED(hr))
{
* pBuffer = new (nothrow) char[length + 1];
if (* pBuffer == NULL)
{
hr = E_OUTOFMEMORY;
}
else
{
hr = Unicode_Utf8(pString, allAscii, * pBuffer, length);
}
}
return hr;
}
HRESULT ConvertUtf8_Unicode(__in_z LPCSTR pString, __out_z LPWSTR * pBuffer)
{
bool allAscii;
DWORD length;
HRESULT hr = Utf8_Unicode_Length(pString, & allAscii, & length);
if (SUCCEEDED(hr))
{
* pBuffer = new (nothrow) WCHAR[length + 1];
if (* pBuffer == NULL)
{
hr = E_OUTOFMEMORY;
}
else
{
hr = Utf8_Unicode(pString, allAscii, * pBuffer, length);
}
}
return hr;
}
#ifdef _MSC_VER
#pragma optimize("", on)
#endif // _MSC_VER
} // namespace FString
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