diff options
Diffstat (limited to 'sal/textenc/tcvtutf8.cxx')
| -rw-r--r-- | sal/textenc/tcvtutf8.cxx | 422 |
1 files changed, 422 insertions, 0 deletions
diff --git a/sal/textenc/tcvtutf8.cxx b/sal/textenc/tcvtutf8.cxx new file mode 100644 index 000000000000..18c6c62dacce --- /dev/null +++ b/sal/textenc/tcvtutf8.cxx @@ -0,0 +1,422 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/************************************************************************* + * + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * Copyright 2000, 2010 Oracle and/or its affiliates. + * + * OpenOffice.org - a multi-platform office productivity suite + * + * This file is part of OpenOffice.org. + * + * OpenOffice.org is free software: you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 3 + * only, as published by the Free Software Foundation. + * + * OpenOffice.org is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Lesser General Public License version 3 for more details + * (a copy is included in the LICENSE file that accompanied this code). + * + * You should have received a copy of the GNU Lesser General Public License + * version 3 along with OpenOffice.org. If not, see + * <http://www.openoffice.org/license.html> + * for a copy of the LGPLv3 License. + * + ************************************************************************/ + +#include "sal/config.h" + +#include "sal/types.h" +#include "rtl/textcvt.h" + +#include "converter.hxx" +#include "tenchelp.hxx" +#include "unichars.hxx" + +struct ImplUtf8ToUnicodeContext +{ + sal_uInt32 nUtf32; + 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 != NULL) + { + static_cast< ImplUtf8ToUnicodeContext * >(pContext)->nShift = -1; + static_cast< ImplUtf8ToUnicodeContext * >(pContext)->bCheckBom = true; + } +} + +sal_Size ImplConvertUtf8ToUnicode(ImplTextConverterData 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) +{ + /* + This function is very liberal with the UTF-8 input. Accepted are: + - non-shortest forms (e.g., C0 41 instead of 41 to represent U+0041) + - surrogates (e.g., ED A0 80 to represent U+D800) + - encodings with up to six bytes (everything outside the range + U+0000..10FFFF is considered "undefined") + The first two of these points allow this routine to translate from both + RTL_TEXTENCODING_UTF8 and RTL_TEXTENCODING_JAVA_UTF8. + */ + + int bJavaUtf8 = pData != NULL; + sal_uInt32 nUtf32 = 0; + int nShift = -1; + bool bCheckBom = true; + sal_uInt32 nInfo = 0; + sal_uChar const * pSrcBufPtr = (sal_uChar const *) pSrcBuf; + sal_uChar const * pSrcBufEnd = pSrcBufPtr + nSrcBytes; + sal_Unicode * pDestBufPtr = pDestBuf; + sal_Unicode * pDestBufEnd = pDestBufPtr + nDestChars; + + if (pContext != NULL) + { + nUtf32 = static_cast< ImplUtf8ToUnicodeContext * >(pContext)->nUtf32; + nShift = static_cast< ImplUtf8ToUnicodeContext * >(pContext)->nShift; + bCheckBom = static_cast< ImplUtf8ToUnicodeContext * >(pContext)->bCheckBom; + } + + while (pSrcBufPtr < pSrcBufEnd) + { + bool bUndefined = false; + int bConsume = true; + sal_uInt32 nChar = *pSrcBufPtr++; + if (nShift < 0) + if (nChar <= 0x7F) + { + nUtf32 = nChar; + goto transform; + } + else if (nChar <= 0xBF) + goto bad_input; + else if (nChar <= 0xDF) + { + nUtf32 = (nChar & 0x1F) << 6; + nShift = 0; + } + else if (nChar <= 0xEF) + { + nUtf32 = (nChar & 0x0F) << 12; + nShift = 6; + } + else if (nChar <= 0xF7) + { + nUtf32 = (nChar & 0x07) << 18; + nShift = 12; + } + else if (nChar <= 0xFB) + { + nUtf32 = (nChar & 0x03) << 24; + nShift = 18; + } + else if (nChar <= 0xFD) + { + nUtf32 = (nChar & 0x01) << 30; + 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 preceeded 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 + || (nFlags & RTL_TEXTTOUNICODE_FLAGS_GLOBAL_SIGNATURE) == 0 + || bJavaUtf8) + { + if (nUtf32 <= 0xFFFF) + if (pDestBufPtr != pDestBufEnd) + *pDestBufPtr++ = (sal_Unicode) nUtf32; + else + goto no_output; + else if (nUtf32 <= 0x10FFFF) + if (pDestBufEnd - pDestBufPtr >= 2) + { + *pDestBufPtr++ = (sal_Unicode) ImplGetHighSurrogate(nUtf32); + *pDestBufPtr++ = (sal_Unicode) ImplGetLowSurrogate(nUtf32); + } + else + goto no_output; + else + { + bUndefined = true; + goto bad_input; + } + } + nShift = -1; + bCheckBom = false; + continue; + + bad_input: + switch (ImplHandleBadInputTextToUnicodeConversion( + bUndefined, true, 0, nFlags, &pDestBufPtr, pDestBufEnd, + &nInfo)) + { + case IMPL_BAD_INPUT_STOP: + nShift = -1; + bCheckBom = false; + if (!bConsume) + --pSrcBufPtr; + break; + + case IMPL_BAD_INPUT_CONTINUE: + nShift = -1; + bCheckBom = false; + if (!bConsume) + --pSrcBufPtr; + continue; + + case IMPL_BAD_INPUT_NO_OUTPUT: + goto no_output; + } + break; + + no_output: + --pSrcBufPtr; + nInfo |= RTL_TEXTTOUNICODE_INFO_DESTBUFFERTOSMALL; + break; + } + + if (nShift >= 0 + && (nInfo & (RTL_TEXTTOUNICODE_INFO_ERROR + | RTL_TEXTTOUNICODE_INFO_DESTBUFFERTOSMALL)) + == 0) + { + if ((nFlags & RTL_TEXTTOUNICODE_FLAGS_FLUSH) == 0) + nInfo |= RTL_TEXTTOUNICODE_INFO_SRCBUFFERTOSMALL; + else + switch (ImplHandleBadInputTextToUnicodeConversion( + false, true, 0, nFlags, &pDestBufPtr, pDestBufEnd, + &nInfo)) + { + case IMPL_BAD_INPUT_STOP: + case IMPL_BAD_INPUT_CONTINUE: + nShift = -1; + bCheckBom = false; + break; + + case IMPL_BAD_INPUT_NO_OUTPUT: + nInfo |= RTL_TEXTTOUNICODE_INFO_DESTBUFFERTOSMALL; + break; + } + } + + if (pContext != NULL) + { + static_cast< ImplUtf8ToUnicodeContext * >(pContext)->nUtf32 = nUtf32; + static_cast< ImplUtf8ToUnicodeContext * >(pContext)->nShift = nShift; + static_cast< ImplUtf8ToUnicodeContext * >(pContext)->bCheckBom = bCheckBom; + } + if (pInfo != NULL) + *pInfo = nInfo; + if (pSrcCvtBytes != NULL) + *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 != NULL) + static_cast< ImplUnicodeToUtf8Context * >(pContext)->nHighSurrogate = 0xFFFF; +} + +sal_Size ImplConvertUnicodeToUtf8(ImplTextConverterData 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) +{ + int bJavaUtf8 = pData != NULL; + 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 != NULL) + 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 (ImplIsHighSurrogate(nChar) && !bJavaUtf8) + { + nHighSurrogate = (sal_Unicode) nChar; + continue; + } + } + else if (ImplIsLowSurrogate(nChar) && !bJavaUtf8) + nChar = ImplCombineSurrogates(nHighSurrogate, nChar); + else + goto bad_input; + + if ((ImplIsLowSurrogate(nChar) && !bJavaUtf8) + || ImplIsNoncharacter(nChar)) + goto bad_input; + + 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 (ImplHandleBadInputUnicodeToTextConversion(false, 0, nFlags, + &pDestBufPtr, + pDestBufEnd, &nInfo, + NULL, 0, NULL)) + { + case IMPL_BAD_INPUT_STOP: + nHighSurrogate = 0; + break; + + case IMPL_BAD_INPUT_CONTINUE: + nHighSurrogate = 0; + continue; + + case IMPL_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 (ImplHandleBadInputUnicodeToTextConversion(false, 0, nFlags, + &pDestBufPtr, + pDestBufEnd, + &nInfo, NULL, 0, + NULL)) + { + case IMPL_BAD_INPUT_STOP: + case IMPL_BAD_INPUT_CONTINUE: + nHighSurrogate = 0; + break; + + case IMPL_BAD_INPUT_NO_OUTPUT: + nInfo |= RTL_UNICODETOTEXT_INFO_DESTBUFFERTOSMALL; + break; + } + } + + done: + if (pContext != NULL) + static_cast< ImplUnicodeToUtf8Context * >(pContext)->nHighSurrogate + = nHighSurrogate; + if (pInfo != NULL) + *pInfo = nInfo; + if (pSrcCvtChars != NULL) + *pSrcCvtChars = pSrcBufPtr - pSrcBuf; + return pDestBufPtr - pDestBuf; +} + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |