Adding upstream version 1:7.0.4.upstream/1%7.0.4upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 461 insertions, 0 deletions

diff --git a/sal/textenc/tcvtutf8.cxx b/sal/textenc/tcvtutf8.cxx
new file mode 100644
index 000000000..ca29156c4
--- /dev/null
+++ b/sal/textenc/tcvtutf8.cxx
@@ -0,0 +1,461 @@
+/* -*- 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++ = static_cast<sal_Unicode>(ImplGetHighSurrogate(nUtf32));
+                *pDestBufPtr++ = static_cast<sal_Unicode>(ImplGetLowSurrogate(nUtf32));
+            }
+            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 (ImplIsHighSurrogate(nChar) && !bJavaUtf8)
+            {
+                nHighSurrogate = static_cast<sal_Unicode>(nChar);
+                continue;
+            }
+            else if (ImplIsLowSurrogate(nChar) && !bJavaUtf8)
+            {
+                goto bad_input;
+            }
+        }
+        else if (ImplIsLowSurrogate(nChar) && !bJavaUtf8)
+            nChar = ImplCombineSurrogates(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: */