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Diffstat (limited to '')
| -rw-r--r-- | sal/textenc/tcvtutf8.cxx | 458 |
1 files changed, 458 insertions, 0 deletions
diff --git a/sal/textenc/tcvtutf8.cxx b/sal/textenc/tcvtutf8.cxx new file mode 100644 index 000000000..f210b654d --- /dev/null +++ b/sal/textenc/tcvtutf8.cxx @@ -0,0 +1,458 @@ +/* -*- 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 <sal/types.h> +#include <rtl/character.hxx> +#include <rtl/textcvt.h> + +#include "converter.hxx" +#include "tcvtutf8.hxx" +#include "tenchelp.hxx" +#include "unichars.hxx" + +namespace { + +struct ImplUtf8ToUnicodeContext +{ + sal_uInt32 nUtf32; + int nBytes; + int nShift; + bool bCheckBom; +}; + +struct ImplUnicodeToUtf8Context +{ + sal_Unicode nHighSurrogate; /* 0xFFFF: write BOM */ +}; + +} + +void * ImplCreateUtf8ToUnicodeContext() +{ + ImplUtf8ToUnicodeContext * p = new ImplUtf8ToUnicodeContext; + ImplResetUtf8ToUnicodeContext(p); + return p; +} + +void ImplResetUtf8ToUnicodeContext(void * pContext) +{ + if (pContext != nullptr) + { + static_cast< ImplUtf8ToUnicodeContext * >(pContext)->nShift = -1; + static_cast< ImplUtf8ToUnicodeContext * >(pContext)->bCheckBom = true; + } +} + +void ImplDestroyUtf8ToUnicodeContext(void * pContext) +{ + delete static_cast< ImplUtf8ToUnicodeContext * >(pContext); +} + +sal_Size ImplConvertUtf8ToUnicode( + 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) +{ + bool bJavaUtf8 = pData != nullptr; + sal_uInt32 nUtf32 = 0; + int nBytes = int(); + int nShift = -1; + bool bCheckBom = true; + sal_uInt32 nInfo = 0; + unsigned char const * pSrcBufPtr = reinterpret_cast<unsigned char const *>(pSrcBuf); + unsigned char const * pSrcBufEnd = pSrcBufPtr + nSrcBytes; + sal_Unicode * pDestBufPtr = pDestBuf; + sal_Unicode * pDestBufEnd = pDestBufPtr + nDestChars; + unsigned char const * startOfCurrentChar = pSrcBufPtr; + + if (pContext != nullptr) + { + nUtf32 = static_cast< ImplUtf8ToUnicodeContext * >(pContext)->nUtf32; + nBytes = static_cast< ImplUtf8ToUnicodeContext * >(pContext)->nBytes; + nShift = static_cast< ImplUtf8ToUnicodeContext * >(pContext)->nShift; + bCheckBom = static_cast< ImplUtf8ToUnicodeContext * >(pContext)->bCheckBom; + } + + while (pSrcBufPtr < pSrcBufEnd) + { + bool bConsume = true; + sal_uInt32 nChar = *pSrcBufPtr++; + if (nShift < 0) + // Allow (illegal) 5 and 6 byte sequences, so they are read as a + // single individual bad character: + if (nChar <= 0x7F) + { + nUtf32 = nChar; + nBytes = 1; + goto transform; + } + else if (nChar <= 0xBF) + goto bad_input; + else if (nChar <= 0xDF) + { + nUtf32 = (nChar & 0x1F) << 6; + nBytes = 2; + nShift = 0; + } + else if (nChar <= 0xEF) + { + nUtf32 = (nChar & 0x0F) << 12; + nBytes = 3; + nShift = 6; + } + else if (nChar <= 0xF7) + { + nUtf32 = (nChar & 0x07) << 18; + nBytes = 4; + nShift = 12; + } + else if (nChar <= 0xFB) + { + nUtf32 = (nChar & 0x03) << 24; + nBytes = 5; + nShift = 18; + } + else if (nChar <= 0xFD) + { + nUtf32 = (nChar & 0x01) << 30; + nBytes = 6; + nShift = 24; + } + else + goto bad_input; + else if ((nChar & 0xC0) == 0x80) + { + nUtf32 |= (nChar & 0x3F) << nShift; + if (nShift == 0) + goto transform; + else + nShift -= 6; + } + else + { + /* + This byte is preceded by a broken UTF-8 sequence; if this byte + is neither in the range [0x80..0xBF] nor in the range + [0xFE..0xFF], assume that this byte does not belong to that + broken sequence, but instead starts a new, legal UTF-8 sequence: + */ + bConsume = nChar >= 0xFE; + goto bad_input; + } + continue; + + transform: + if (!bCheckBom || nUtf32 != 0xFEFF || nBytes != 3 + || (nFlags & RTL_TEXTTOUNICODE_FLAGS_GLOBAL_SIGNATURE) == 0 + || bJavaUtf8) + { + switch (nBytes) { + case 1: + if (bJavaUtf8 && nUtf32 == 0) { + goto bad_input; + } + break; + case 2: + if (nUtf32 < 0x80 && !(bJavaUtf8 && nUtf32 == 0)) { + goto bad_input; + } + break; + case 3: + if (nUtf32 < 0x800 || (!bJavaUtf8 && rtl::isSurrogate(nUtf32))) + { + goto bad_input; + } + break; + case 4: + if (nUtf32 < 0x10000 || !rtl::isUnicodeCodePoint(nUtf32) + || bJavaUtf8) + { + goto bad_input; + } + break; + default: + goto bad_input; + } + if (nUtf32 <= 0xFFFF) + if (pDestBufPtr != pDestBufEnd) + *pDestBufPtr++ = static_cast<sal_Unicode>(nUtf32); + else + goto no_output; + else if (pDestBufEnd - pDestBufPtr >= 2) + pDestBufPtr += rtl::splitSurrogates(nUtf32, pDestBufPtr); + else + goto no_output; + } + nShift = -1; + bCheckBom = false; + startOfCurrentChar = pSrcBufPtr; + continue; + + bad_input: + switch (sal::detail::textenc::handleBadInputTextToUnicodeConversion( + false, nBytes != 1, 0, nFlags, &pDestBufPtr, pDestBufEnd, + &nInfo)) + { + case sal::detail::textenc::BAD_INPUT_STOP: + nShift = -1; + bCheckBom = false; + if ((nFlags & RTL_TEXTTOUNICODE_FLAGS_FLUSH) == 0) { + if (!bConsume) + --pSrcBufPtr; + } else { + pSrcBufPtr = startOfCurrentChar; + } + break; + + case sal::detail::textenc::BAD_INPUT_CONTINUE: + nShift = -1; + bCheckBom = false; + if (!bConsume) + --pSrcBufPtr; + startOfCurrentChar = pSrcBufPtr; + continue; + + case sal::detail::textenc::BAD_INPUT_NO_OUTPUT: + goto no_output; + } + break; + + no_output: + --pSrcBufPtr; + nInfo |= RTL_TEXTTOUNICODE_INFO_DESTBUFFERTOOSMALL; + break; + } + + if (nShift >= 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) { + pSrcBufPtr = startOfCurrentChar; + } + [[fallthrough]]; + case sal::detail::textenc::BAD_INPUT_CONTINUE: + nShift = -1; + bCheckBom = false; + break; + + case sal::detail::textenc::BAD_INPUT_NO_OUTPUT: + nInfo |= RTL_TEXTTOUNICODE_INFO_DESTBUFFERTOOSMALL; + break; + } + } + + if (pContext != nullptr) + { + static_cast< ImplUtf8ToUnicodeContext * >(pContext)->nUtf32 = nUtf32; + static_cast< ImplUtf8ToUnicodeContext * >(pContext)->nBytes = nBytes; + static_cast< ImplUtf8ToUnicodeContext * >(pContext)->nShift = nShift; + static_cast< ImplUtf8ToUnicodeContext * >(pContext)->bCheckBom = bCheckBom; + } + if (pInfo != nullptr) + *pInfo = nInfo; + if (pSrcCvtBytes != nullptr) + *pSrcCvtBytes = reinterpret_cast< char const * >(pSrcBufPtr) - pSrcBuf; + return pDestBufPtr - pDestBuf; +} + +void * ImplCreateUnicodeToUtf8Context() +{ + ImplUnicodeToUtf8Context * p = new ImplUnicodeToUtf8Context; + ImplResetUnicodeToUtf8Context(p); + return p; +} + +void ImplResetUnicodeToUtf8Context(void * pContext) +{ + if (pContext != nullptr) + static_cast< ImplUnicodeToUtf8Context * >(pContext)->nHighSurrogate = 0xFFFF; +} + +void ImplDestroyUnicodeToUtf8Context(void * pContext) +{ + delete static_cast< ImplUnicodeToUtf8Context * >(pContext); +} + +sal_Size ImplConvertUnicodeToUtf8( + 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) +{ + bool bJavaUtf8 = pData != nullptr; + sal_Unicode nHighSurrogate = 0xFFFF; + sal_uInt32 nInfo = 0; + sal_Unicode const * pSrcBufPtr = pSrcBuf; + sal_Unicode const * pSrcBufEnd = pSrcBufPtr + nSrcChars; + char * pDestBufPtr = pDestBuf; + char * pDestBufEnd = pDestBufPtr + nDestBytes; + + if (pContext != nullptr) + nHighSurrogate + = static_cast< ImplUnicodeToUtf8Context * >(pContext)->nHighSurrogate; + + if (nHighSurrogate == 0xFFFF) + { + if ((nFlags & RTL_UNICODETOTEXT_FLAGS_GLOBAL_SIGNATURE) != 0 + && !bJavaUtf8) + { + if (pDestBufEnd - pDestBufPtr >= 3) + { + /* Write BOM (U+FEFF) as UTF-8: */ + *pDestBufPtr++ = static_cast< char >(static_cast< unsigned char >(0xEF)); + *pDestBufPtr++ = static_cast< char >(static_cast< unsigned char >(0xBB)); + *pDestBufPtr++ = static_cast< char >(static_cast< unsigned char >(0xBF)); + } + else + { + nInfo |= RTL_UNICODETOTEXT_INFO_DESTBUFFERTOSMALL; + goto done; + } + } + nHighSurrogate = 0; + } + + while (pSrcBufPtr < pSrcBufEnd) + { + sal_uInt32 nChar = *pSrcBufPtr++; + if (nHighSurrogate == 0) + { + if (rtl::isHighSurrogate(nChar) && !bJavaUtf8) + { + nHighSurrogate = static_cast<sal_Unicode>(nChar); + continue; + } + else if (rtl::isLowSurrogate(nChar) && !bJavaUtf8) + { + goto bad_input; + } + } + else if (rtl::isLowSurrogate(nChar) && !bJavaUtf8) + nChar = rtl::combineSurrogates(nHighSurrogate, nChar); + else + goto bad_input; + + assert(bJavaUtf8 ? nChar <= 0xFFFF : rtl::isUnicodeScalarValue(nChar)); + + if (nChar <= 0x7F && (!bJavaUtf8 || nChar != 0)) + if (pDestBufPtr != pDestBufEnd) + *pDestBufPtr++ = static_cast< char >(nChar); + else + goto no_output; + else if (nChar <= 0x7FF) + if (pDestBufEnd - pDestBufPtr >= 2) + { + *pDestBufPtr++ = static_cast< char >(0xC0 | (nChar >> 6)); + *pDestBufPtr++ = static_cast< char >(0x80 | (nChar & 0x3F)); + } + else + goto no_output; + else if (nChar <= 0xFFFF) + if (pDestBufEnd - pDestBufPtr >= 3) + { + *pDestBufPtr++ = static_cast< char >(0xE0 | (nChar >> 12)); + *pDestBufPtr++ = static_cast< char >(0x80 | ((nChar >> 6) & 0x3F)); + *pDestBufPtr++ = static_cast< char >(0x80 | (nChar & 0x3F)); + } + else + goto no_output; + else if (pDestBufEnd - pDestBufPtr >= 4) + { + *pDestBufPtr++ = static_cast< char >(0xF0 | (nChar >> 18)); + *pDestBufPtr++ = static_cast< char >(0x80 | ((nChar >> 12) & 0x3F)); + *pDestBufPtr++ = static_cast< char >(0x80 | ((nChar >> 6) & 0x3F)); + *pDestBufPtr++ = static_cast< char >(0x80 | (nChar & 0x3F)); + } + else + goto no_output; + nHighSurrogate = 0; + continue; + + bad_input: + switch (sal::detail::textenc::handleBadInputUnicodeToTextConversion( + false, 0, 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: + --pSrcBufPtr; + 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; + } + } + + done: + if (pContext != nullptr) + static_cast< ImplUnicodeToUtf8Context * >(pContext)->nHighSurrogate + = nHighSurrogate; + if (pInfo != nullptr) + *pInfo = nInfo; + if (pSrcCvtChars != nullptr) + *pSrcCvtChars = pSrcBufPtr - pSrcBuf; + return pDestBufPtr - pDestBuf; +} + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |