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office-gobmx/sal/textenc/converteuctw.cxx
Mike Kaganski 8b333c7694 Use rtl functions instead of own surrogate checking/combining 
Change-Id: I3eb05d8f5b0761bc3b672d4c855eb469f8cc1a29
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/127375
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>
2021-12-24 21:42:08 +01:00

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#include <sal/config.h>
#include <cassert>
#include <rtl/character.hxx>
#include <rtl/textcvt.h>
#include <sal/types.h>
#include "context.hxx"
#include "converter.hxx"
#include "converteuctw.hxx"
#include "tenchelp.hxx"
#include "unichars.hxx"
namespace {
enum ImplEucTwToUnicodeState
{
IMPL_EUC_TW_TO_UNICODE_STATE_0,
IMPL_EUC_TW_TO_UNICODE_STATE_1,
IMPL_EUC_TW_TO_UNICODE_STATE_2_1,
IMPL_EUC_TW_TO_UNICODE_STATE_2_2,
IMPL_EUC_TW_TO_UNICODE_STATE_2_3
};
struct ImplEucTwToUnicodeContext
{
ImplEucTwToUnicodeState m_eState;
sal_Int32 m_nPlane; // 0--15
sal_Int32 m_nRow; // 0--93
};
}
void * ImplCreateEucTwToUnicodeContext()
{
ImplEucTwToUnicodeContext * pContext = new ImplEucTwToUnicodeContext;
pContext->m_eState = IMPL_EUC_TW_TO_UNICODE_STATE_0;
return pContext;
}
void ImplResetEucTwToUnicodeContext(void * pContext)
{
if (pContext)
static_cast< ImplEucTwToUnicodeContext * >(pContext)->m_eState
= IMPL_EUC_TW_TO_UNICODE_STATE_0;
}
void ImplDestroyEucTwToUnicodeContext(void * pContext)
{
delete static_cast< ImplEucTwToUnicodeContext * >(pContext);
}
sal_Size ImplConvertEucTwToUnicode(void const * pData,
void * pContext,
char const * pSrcBuf,
sal_Size nSrcBytes,
sal_Unicode * pDestBuf,
sal_Size nDestChars,
sal_uInt32 nFlags,
sal_uInt32 * pInfo,
sal_Size * pSrcCvtBytes)
{
sal_uInt16 const * pCns116431992Data
= static_cast< ImplEucTwConverterData const * >(pData)->
m_pCns116431992ToUnicodeData;
sal_Int32 const * pCns116431992RowOffsets
= static_cast< ImplEucTwConverterData const * >(pData)->
m_pCns116431992ToUnicodeRowOffsets;
sal_Int32 const * pCns116431992PlaneOffsets
= static_cast< ImplEucTwConverterData const * >(pData)->
m_pCns116431992ToUnicodePlaneOffsets;
ImplEucTwToUnicodeState eState = IMPL_EUC_TW_TO_UNICODE_STATE_0;
sal_Int32 nPlane = 0;
sal_Int32 nRow = 0;
sal_uInt32 nInfo = 0;
sal_Size nConverted = 0;
sal_Unicode * pDestBufPtr = pDestBuf;
sal_Unicode * pDestBufEnd = pDestBuf + nDestChars;
sal_Size startOfCurrentChar = 0;
if (pContext)
{
eState = static_cast< ImplEucTwToUnicodeContext * >(pContext)->m_eState;
nPlane = static_cast< ImplEucTwToUnicodeContext * >(pContext)->m_nPlane;
nRow = static_cast< ImplEucTwToUnicodeContext * >(pContext)->m_nRow;
}
for (; nConverted < nSrcBytes; ++nConverted)
{
bool bUndefined = true;
sal_uInt32 nChar = *reinterpret_cast<unsigned char const *>(pSrcBuf++);
switch (eState)
{
case IMPL_EUC_TW_TO_UNICODE_STATE_0:
if (nChar < 0x80)
if (pDestBufPtr != pDestBufEnd) {
*pDestBufPtr++ = static_cast<sal_Unicode>(nChar);
startOfCurrentChar = nConverted + 1;
} else
goto no_output;
else if (nChar >= 0xA1 && nChar <= 0xFE)
{
nRow = nChar - 0xA1;
eState = IMPL_EUC_TW_TO_UNICODE_STATE_1;
}
else if (nChar == 0x8E)
eState = IMPL_EUC_TW_TO_UNICODE_STATE_2_1;
else
{
bUndefined = false;
goto bad_input;
}
break;
case IMPL_EUC_TW_TO_UNICODE_STATE_1:
if (nChar >= 0xA1 && nChar <= 0xFE)
{
nPlane = 0;
goto transform;
}
else
{
bUndefined = false;
goto bad_input;
}
break;
case IMPL_EUC_TW_TO_UNICODE_STATE_2_1:
if (nChar >= 0xA1 && nChar <= 0xB0)
{
nPlane = nChar - 0xA1;
eState = IMPL_EUC_TW_TO_UNICODE_STATE_2_2;
}
else
{
bUndefined = false;
goto bad_input;
}
break;
case IMPL_EUC_TW_TO_UNICODE_STATE_2_2:
if (nChar >= 0xA1 && nChar <= 0xFE)
{
nRow = nChar - 0xA1;
eState = IMPL_EUC_TW_TO_UNICODE_STATE_2_3;
}
else
{
bUndefined = false;
goto bad_input;
}
break;
case IMPL_EUC_TW_TO_UNICODE_STATE_2_3:
if (nChar >= 0xA1 && nChar <= 0xFE)
goto transform;
else
{
bUndefined = false;
goto bad_input;
}
break;
}
continue;
transform:
{
sal_Int32 nPlaneOffset = pCns116431992PlaneOffsets[nPlane];
if (nPlaneOffset == -1)
goto bad_input;
else
{
sal_Int32 nOffset
= pCns116431992RowOffsets[nPlaneOffset + nRow];
if (nOffset == -1)
goto bad_input;
else
{
sal_uInt32 nFirstLast = pCns116431992Data[nOffset++];
sal_uInt32 nFirst = nFirstLast & 0xFF;
sal_uInt32 nLast = nFirstLast >> 8;
nChar -= 0xA0;
if (nChar >= nFirst && nChar <= nLast)
{
sal_uInt32 nUnicode
= pCns116431992Data[nOffset + (nChar - nFirst)];
if (nUnicode == 0xFFFF)
goto bad_input;
else if (rtl::isHighSurrogate(nUnicode))
if (pDestBufEnd - pDestBufPtr >= 2)
{
nOffset += nLast - nFirst + 1;
nFirst = pCns116431992Data[nOffset++];
*pDestBufPtr++ = static_cast<sal_Unicode>(nUnicode);
*pDestBufPtr++
= static_cast<sal_Unicode>(pCns116431992Data[
nOffset + (nChar - nFirst)]);
startOfCurrentChar = nConverted + 1;
}
else
goto no_output;
else
if (pDestBufPtr != pDestBufEnd) {
*pDestBufPtr++ = static_cast<sal_Unicode>(nUnicode);
startOfCurrentChar = nConverted + 1;
} else
goto no_output;
}
else
goto bad_input;
eState = IMPL_EUC_TW_TO_UNICODE_STATE_0;
}
}
continue;
}
bad_input:
switch (sal::detail::textenc::handleBadInputTextToUnicodeConversion(
bUndefined, true, 0, nFlags, &pDestBufPtr, pDestBufEnd,
&nInfo))
{
case sal::detail::textenc::BAD_INPUT_STOP:
eState = IMPL_EUC_TW_TO_UNICODE_STATE_0;
if ((nFlags & RTL_TEXTTOUNICODE_FLAGS_FLUSH) == 0) {
++nConverted;
} else {
nConverted = startOfCurrentChar;
}
break;
case sal::detail::textenc::BAD_INPUT_CONTINUE:
eState = IMPL_EUC_TW_TO_UNICODE_STATE_0;
startOfCurrentChar = nConverted + 1;
continue;
case sal::detail::textenc::BAD_INPUT_NO_OUTPUT:
goto no_output;
}
break;
no_output:
--pSrcBuf;
nInfo |= RTL_TEXTTOUNICODE_INFO_DESTBUFFERTOOSMALL;
break;
}
if (eState != IMPL_EUC_TW_TO_UNICODE_STATE_0
&& (nInfo & (RTL_TEXTTOUNICODE_INFO_ERROR
| RTL_TEXTTOUNICODE_INFO_DESTBUFFERTOOSMALL))
== 0)
{
if ((nFlags & RTL_TEXTTOUNICODE_FLAGS_FLUSH) == 0)
nInfo |= RTL_TEXTTOUNICODE_INFO_SRCBUFFERTOOSMALL;
else
switch (sal::detail::textenc::handleBadInputTextToUnicodeConversion(
false, true, 0, nFlags, &pDestBufPtr, pDestBufEnd,
&nInfo))
{
case sal::detail::textenc::BAD_INPUT_STOP:
if ((nFlags & RTL_TEXTTOUNICODE_FLAGS_FLUSH) != 0) {
nConverted = startOfCurrentChar;
}
[[fallthrough]];
case sal::detail::textenc::BAD_INPUT_CONTINUE:
eState = IMPL_EUC_TW_TO_UNICODE_STATE_0;
break;
case sal::detail::textenc::BAD_INPUT_NO_OUTPUT:
nInfo |= RTL_TEXTTOUNICODE_INFO_DESTBUFFERTOOSMALL;
break;
}
}
if (pContext)
{
static_cast< ImplEucTwToUnicodeContext * >(pContext)->m_eState = eState;
static_cast< ImplEucTwToUnicodeContext * >(pContext)->m_nPlane = nPlane;
static_cast< ImplEucTwToUnicodeContext * >(pContext)->m_nRow = nRow;
}
if (pInfo)
*pInfo = nInfo;
if (pSrcCvtBytes)
*pSrcCvtBytes = nConverted;
return pDestBufPtr - pDestBuf;
}
sal_Size ImplConvertUnicodeToEucTw(void const * pData,
void * pContext,
sal_Unicode const * pSrcBuf,
sal_Size nSrcChars,
char * pDestBuf,
sal_Size nDestBytes,
sal_uInt32 nFlags,
sal_uInt32 * pInfo,
sal_Size * pSrcCvtChars)
{
sal_uInt8 const * pCns116431992Data
= static_cast< ImplEucTwConverterData const * >(pData)->
m_pUnicodeToCns116431992Data;
sal_Int32 const * pCns116431992PageOffsets
= static_cast< ImplEucTwConverterData const * >(pData)->
m_pUnicodeToCns116431992PageOffsets;
sal_Int32 const * pCns116431992PlaneOffsets
= static_cast< ImplEucTwConverterData const * >(pData)->
m_pUnicodeToCns116431992PlaneOffsets;
sal_Unicode nHighSurrogate = 0;
sal_uInt32 nInfo = 0;
sal_Size nConverted = 0;
char * pDestBufPtr = pDestBuf;
char * pDestBufEnd = pDestBuf + nDestBytes;
if (pContext)
nHighSurrogate
= static_cast<ImplUnicodeToTextContext *>(pContext)->m_nHighSurrogate;
for (; nConverted < nSrcChars; ++nConverted)
{
bool bUndefined = true;
sal_uInt32 nChar = *pSrcBuf++;
if (nHighSurrogate == 0)
{
if (rtl::isHighSurrogate(nChar))
{
nHighSurrogate = static_cast<sal_Unicode>(nChar);
continue;
}
else if (rtl::isLowSurrogate(nChar))
{
bUndefined = false;
goto bad_input;
}
}
else if (rtl::isLowSurrogate(nChar))
nChar = rtl::combineSurrogates(nHighSurrogate, nChar);
else
{
bUndefined = false;
goto bad_input;
}
assert(rtl::isUnicodeScalarValue(nChar));
if (nChar < 0x80)
if (pDestBufPtr != pDestBufEnd)
*pDestBufPtr++ = static_cast< char >(nChar);
else
goto no_output;
else
{
sal_Int32 nOffset = pCns116431992PlaneOffsets[nChar >> 16];
sal_uInt32 nFirst;
sal_uInt32 nLast;
sal_uInt32 nPlane;
if (nOffset == -1)
goto bad_input;
nOffset
= pCns116431992PageOffsets[nOffset + ((nChar & 0xFF00) >> 8)];
if (nOffset == -1)
goto bad_input;
nFirst = pCns116431992Data[nOffset++];
nLast = pCns116431992Data[nOffset++];
nChar &= 0xFF;
if (nChar < nFirst || nChar > nLast)
goto bad_input;
nOffset += 3 * (nChar - nFirst);
nPlane = pCns116431992Data[nOffset++];
if (nPlane == 0)
goto bad_input;
if (pDestBufEnd - pDestBufPtr < (nPlane == 1 ? 2 : 4))
goto no_output;
if (nPlane != 1)
{
*pDestBufPtr++ = static_cast< char >(static_cast< unsigned char >(0x8E));
*pDestBufPtr++ = static_cast< char >(0xA0 + nPlane);
}
*pDestBufPtr++ = static_cast< char >(0xA0 + pCns116431992Data[nOffset++]);
*pDestBufPtr++ = static_cast< char >(0xA0 + pCns116431992Data[nOffset]);
}
nHighSurrogate = 0;
continue;
bad_input:
switch (sal::detail::textenc::handleBadInputUnicodeToTextConversion(
bUndefined, nChar, nFlags, &pDestBufPtr, pDestBufEnd,
&nInfo, nullptr, 0, nullptr))
{
case sal::detail::textenc::BAD_INPUT_STOP:
nHighSurrogate = 0;
break;
case sal::detail::textenc::BAD_INPUT_CONTINUE:
nHighSurrogate = 0;
continue;
case sal::detail::textenc::BAD_INPUT_NO_OUTPUT:
goto no_output;
}
break;
no_output:
--pSrcBuf;
nInfo |= RTL_UNICODETOTEXT_INFO_DESTBUFFERTOSMALL;
break;
}
if (nHighSurrogate != 0
&& (nInfo & (RTL_UNICODETOTEXT_INFO_ERROR
| RTL_UNICODETOTEXT_INFO_DESTBUFFERTOSMALL))
== 0)
{
if ((nFlags & RTL_UNICODETOTEXT_FLAGS_FLUSH) != 0)
nInfo |= RTL_UNICODETOTEXT_INFO_SRCBUFFERTOSMALL;
else
switch (sal::detail::textenc::handleBadInputUnicodeToTextConversion(
false, 0, nFlags, &pDestBufPtr, pDestBufEnd, &nInfo,
nullptr, 0, nullptr))
{
case sal::detail::textenc::BAD_INPUT_STOP:
case sal::detail::textenc::BAD_INPUT_CONTINUE:
nHighSurrogate = 0;
break;
case sal::detail::textenc::BAD_INPUT_NO_OUTPUT:
nInfo |= RTL_UNICODETOTEXT_INFO_DESTBUFFERTOSMALL;
break;
}
}
if (pContext)
static_cast<ImplUnicodeToTextContext *>(pContext)->m_nHighSurrogate
= nHighSurrogate;
if (pInfo)
*pInfo = nInfo;
if (pSrcCvtChars)
*pSrcCvtChars = nConverted;
return pDestBufPtr - pDestBuf;
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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