Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream

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

3 files changed, 1968 insertions, 0 deletions

diff --git a/tools/source/inet/inetmime.cxx b/tools/source/inet/inetmime.cxx
new file mode 100644
index 000000000..2a57c099c
--- /dev/null
+++ b/tools/source/inet/inetmime.cxx
@@ -0,0 +1,1380 @@
+/* -*- 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 <algorithm>
+#include <limits>
+#include <forward_list>
+#include <memory>
+
+#include <sal/log.hxx>
+#include <rtl/ustring.hxx>
+#include <rtl/strbuf.hxx>
+#include <rtl/ustrbuf.hxx>
+#include <rtl/tencinfo.h>
+#include <tools/inetmime.hxx>
+#include <rtl/character.hxx>
+
+namespace {
+
+rtl_TextEncoding getCharsetEncoding(const char * pBegin,
+                                           const char * pEnd);
+
+/** Check for US-ASCII white space character.
+
+    @param nChar  Some UCS-4 character.
+
+    @return  True if nChar is a US-ASCII white space character (US-ASCII
+    0x09 or 0x20).
+ */
+bool isWhiteSpace(sal_uInt32 nChar)
+{
+    return nChar == '\t' || nChar == ' ';
+}
+
+/** Get the Base 64 digit weight of a US-ASCII character.
+
+    @param nChar  Some UCS-4 character.
+
+    @return  If nChar is a US-ASCII Base 64 digit character (US-ASCII
+    'A'--'F', or 'a'--'f', '0'--'9', '+', or '/'), return the
+    corresponding weight (0--63); if nChar is the US-ASCII Base 64 padding
+    character (US-ASCII '='), return -1; otherwise, return -2.
+ */
+int getBase64Weight(sal_uInt32 nChar)
+{
+    return rtl::isAsciiUpperCase(nChar) ? int(nChar - 'A') :
+           rtl::isAsciiLowerCase(nChar) ? int(nChar - 'a' + 26) :
+           rtl::isAsciiDigit(nChar) ? int(nChar - '0' + 52) :
+           nChar == '+' ? 62 :
+           nChar == '/' ? 63 :
+           nChar == '=' ? -1 : -2;
+}
+
+bool startsWithLineFolding(const sal_Unicode * pBegin,
+                                            const sal_Unicode * pEnd)
+{
+    DBG_ASSERT(pBegin && pBegin <= pEnd,
+               "startsWithLineFolding(): Bad sequence");
+
+    return pEnd - pBegin >= 3 && pBegin[0] == 0x0D && pBegin[1] == 0x0A
+           && isWhiteSpace(pBegin[2]); // CR, LF
+}
+
+rtl_TextEncoding translateFromMIME(rtl_TextEncoding
+                                                        eEncoding)
+{
+#if defined(_WIN32)
+    return eEncoding == RTL_TEXTENCODING_ISO_8859_1 ?
+               RTL_TEXTENCODING_MS_1252 : eEncoding;
+#else
+    return eEncoding;
+#endif
+}
+
+bool isMIMECharsetEncoding(rtl_TextEncoding eEncoding)
+{
+    return rtl_isOctetTextEncoding(eEncoding);
+}
+
+std::unique_ptr<sal_Unicode[]> convertToUnicode(const char * pBegin,
+                                         const char * pEnd,
+                                         rtl_TextEncoding eEncoding,
+                                         sal_Size & rSize)
+{
+    if (eEncoding == RTL_TEXTENCODING_DONTKNOW)
+        return nullptr;
+    rtl_TextToUnicodeConverter hConverter
+        = rtl_createTextToUnicodeConverter(eEncoding);
+    rtl_TextToUnicodeContext hContext
+        = rtl_createTextToUnicodeContext(hConverter);
+    std::unique_ptr<sal_Unicode[]> pBuffer;
+    sal_uInt32 nInfo;
+    for (sal_Size nBufferSize = pEnd - pBegin;;
+         nBufferSize += nBufferSize / 3 + 1)
+    {
+        pBuffer.reset(new sal_Unicode[nBufferSize]);
+        sal_Size nSrcCvtBytes;
+        rSize = rtl_convertTextToUnicode(
+                    hConverter, hContext, pBegin, pEnd - pBegin, pBuffer.get(),
+                    nBufferSize,
+                    RTL_TEXTTOUNICODE_FLAGS_UNDEFINED_ERROR
+                        | RTL_TEXTTOUNICODE_FLAGS_MBUNDEFINED_ERROR
+                        | RTL_TEXTTOUNICODE_FLAGS_INVALID_ERROR,
+                    &nInfo, &nSrcCvtBytes);
+        if (nInfo != RTL_TEXTTOUNICODE_INFO_DESTBUFFERTOOSMALL)
+            break;
+        pBuffer.reset();
+        rtl_resetTextToUnicodeContext(hConverter, hContext);
+    }
+    rtl_destroyTextToUnicodeContext(hConverter, hContext);
+    rtl_destroyTextToUnicodeConverter(hConverter);
+    if (nInfo != 0)
+    {
+        pBuffer.reset();
+    }
+    return pBuffer;
+}
+
+void writeUTF8(OStringBuffer & rSink, sal_uInt32 nChar)
+{
+    // See RFC 2279 for a discussion of UTF-8.
+    DBG_ASSERT(nChar < 0x80000000, "writeUTF8(): Bad char");
+
+    if (nChar < 0x80)
+        rSink.append(char(nChar));
+    else if (nChar < 0x800)
+        rSink.append(char(nChar >> 6 | 0xC0))
+             .append(char((nChar & 0x3F) | 0x80));
+    else if (nChar < 0x10000)
+        rSink.append(char(nChar >> 12 | 0xE0))
+             .append(char((nChar >> 6 & 0x3F) | 0x80))
+             .append(char((nChar & 0x3F) | 0x80));
+    else if (nChar < 0x200000)
+        rSink.append(char(nChar >> 18 | 0xF0))
+             .append(char((nChar >> 12 & 0x3F) | 0x80))
+             .append(char((nChar >> 6 & 0x3F) | 0x80))
+             .append(char((nChar & 0x3F) | 0x80));
+    else if (nChar < 0x4000000)
+        rSink.append(char(nChar >> 24 | 0xF8))
+             .append(char((nChar >> 18 & 0x3F) | 0x80))
+             .append(char((nChar >> 12 & 0x3F) | 0x80))
+             .append(char((nChar >> 6 & 0x3F) | 0x80))
+             .append(char((nChar & 0x3F) | 0x80));
+    else
+        rSink.append(char(nChar >> 30 | 0xFC))
+             .append(char((nChar >> 24 & 0x3F) | 0x80))
+             .append(char((nChar >> 18 & 0x3F) | 0x80))
+             .append(char((nChar >> 12 & 0x3F) | 0x80))
+             .append(char((nChar >> 6 & 0x3F) | 0x80))
+             .append(char((nChar & 0x3F) | 0x80));
+}
+
+bool translateUTF8Char(const char *& rBegin,
+                                 const char * pEnd,
+                                 sal_uInt32 & rCharacter)
+{
+    if (rBegin == pEnd || static_cast< unsigned char >(*rBegin) < 0x80
+        || static_cast< unsigned char >(*rBegin) >= 0xFE)
+        return false;
+
+    int nCount;
+    sal_uInt32 nMin;
+    sal_uInt32 nUCS4;
+    const char * p = rBegin;
+    if (static_cast< unsigned char >(*p) < 0xE0)
+    {
+        nCount = 1;
+        nMin = 0x80;
+        nUCS4 = static_cast< unsigned char >(*p) & 0x1F;
+    }
+    else if (static_cast< unsigned char >(*p) < 0xF0)
+    {
+        nCount = 2;
+        nMin = 0x800;
+        nUCS4 = static_cast< unsigned char >(*p) & 0xF;
+    }
+    else if (static_cast< unsigned char >(*p) < 0xF8)
+    {
+        nCount = 3;
+        nMin = 0x10000;
+        nUCS4 = static_cast< unsigned char >(*p) & 7;
+    }
+    else if (static_cast< unsigned char >(*p) < 0xFC)
+    {
+        nCount = 4;
+        nMin = 0x200000;
+        nUCS4 = static_cast< unsigned char >(*p) & 3;
+    }
+    else
+    {
+        nCount = 5;
+        nMin = 0x4000000;
+        nUCS4 = static_cast< unsigned char >(*p) & 1;
+    }
+    ++p;
+
+    for (; nCount-- > 0; ++p)
+        if ((static_cast< unsigned char >(*p) & 0xC0) == 0x80)
+            nUCS4 = (nUCS4 << 6) | (static_cast< unsigned char >(*p) & 0x3F);
+        else
+            return false;
+
+    if (!rtl::isUnicodeCodePoint(nUCS4) || nUCS4 < nMin)
+        return false;
+
+    rCharacter = nUCS4;
+    rBegin = p;
+    return true;
+}
+
+void appendISO88591(OUStringBuffer & rText, char const * pBegin,
+                    char const * pEnd);
+
+struct Parameter
+{
+    OString m_aAttribute;
+    OString m_aCharset;
+    OString m_aLanguage;
+    OString m_aValue;
+    sal_uInt32 m_nSection;
+    bool m_bExtended;
+
+    bool operator<(const Parameter& rhs) const // is used by std::list<Parameter>::sort
+    {
+        int nComp = m_aAttribute.compareTo(rhs.m_aAttribute);
+        return nComp < 0 ||
+                (nComp == 0 && m_nSection < rhs.m_nSection);
+    }
+    struct IsSameSection // is used to check container for duplicates with std::any_of
+    {
+        const OString& rAttribute;
+        const sal_uInt32 nSection;
+        bool operator()(const Parameter& r) const
+        { return r.m_aAttribute == rAttribute && r.m_nSection == nSection; }
+    };
+};
+
+typedef std::forward_list<Parameter> ParameterList;
+
+bool parseParameters(ParameterList const & rInput,
+                     INetContentTypeParameterList * pOutput);
+
+//  appendISO88591
+
+void appendISO88591(OUStringBuffer & rText, char const * pBegin,
+                    char const * pEnd)
+{
+    sal_Int32 nLength = pEnd - pBegin;
+    std::unique_ptr<sal_Unicode[]> pBuffer(new sal_Unicode[nLength]);
+    for (sal_Unicode * p = pBuffer.get(); pBegin != pEnd;)
+        *p++ = static_cast<unsigned char>(*pBegin++);
+    rText.append(pBuffer.get(), nLength);
+}
+
+//  parseParameters
+
+bool parseParameters(ParameterList const & rInput,
+                     INetContentTypeParameterList * pOutput)
+{
+    if (pOutput)
+        pOutput->clear();
+
+    for (auto it = rInput.begin(), itPrev = rInput.end(); it != rInput.end() ; itPrev = it++)
+    {
+        if (it->m_nSection > 0
+            && (itPrev == rInput.end()
+                || itPrev->m_nSection != it->m_nSection - 1
+                || itPrev->m_aAttribute != it->m_aAttribute))
+            return false;
+    }
+
+    if (pOutput)
+        for (auto it = rInput.begin(), itNext = rInput.begin(); it != rInput.end(); it = itNext)
+        {
+            bool bCharset = !it->m_aCharset.isEmpty();
+            rtl_TextEncoding eEncoding = RTL_TEXTENCODING_DONTKNOW;
+            if (bCharset)
+                eEncoding
+                    = getCharsetEncoding(it->m_aCharset.getStr(),
+                                                   it->m_aCharset.getStr()
+                                                       + it->m_aCharset.getLength());
+            OUStringBuffer aValue(64);
+            bool bBadEncoding = false;
+            itNext = it;
+            do
+            {
+                sal_Size nSize;
+                std::unique_ptr<sal_Unicode[]> pUnicode
+                    = convertToUnicode(itNext->m_aValue.getStr(),
+                                                 itNext->m_aValue.getStr()
+                                                     + itNext->m_aValue.getLength(),
+                                                 bCharset && it->m_bExtended ?
+                                                     eEncoding :
+                                                     RTL_TEXTENCODING_UTF8,
+                                                 nSize);
+                if (!pUnicode && !(bCharset && it->m_bExtended))
+                    pUnicode = convertToUnicode(
+                                   itNext->m_aValue.getStr(),
+                                   itNext->m_aValue.getStr()
+                                       + itNext->m_aValue.getLength(),
+                                   RTL_TEXTENCODING_ISO_8859_1, nSize);
+                if (!pUnicode)
+                {
+                    bBadEncoding = true;
+                    break;
+                }
+                aValue.append(pUnicode.get(), static_cast<sal_Int32>(nSize));
+                ++itNext;
+            }
+            while (itNext != rInput.end() && itNext->m_nSection != 0);
+
+            if (bBadEncoding)
+            {
+                aValue.setLength(0);
+                itNext = it;
+                do
+                {
+                    if (itNext->m_bExtended)
+                    {
+                        for (sal_Int32 i = 0; i < itNext->m_aValue.getLength(); ++i)
+                            aValue.append(
+                                static_cast<sal_Unicode>(
+                                    static_cast<unsigned char>(itNext->m_aValue[i])
+                                    | 0xF800)); // map to unicode corporate use sub area
+                    }
+                    else
+                    {
+                        for (sal_Int32 i = 0; i < itNext->m_aValue.getLength(); ++i)
+                            aValue.append( itNext->m_aValue[i] );
+                    }
+                    ++itNext;
+                }
+                while (itNext != rInput.end() && itNext->m_nSection != 0);
+            }
+            auto const ret = pOutput->insert(
+                {it->m_aAttribute,
+                 {it->m_aCharset, it->m_aLanguage, aValue.makeStringAndClear(), !bBadEncoding}});
+            SAL_INFO_IF(!ret.second, "tools",
+                "INetMIME: dropping duplicate parameter: " << it->m_aAttribute);
+        }
+    return true;
+}
+
+/** Check whether some character is valid within an RFC 2045 <token>.
+
+    @param nChar  Some UCS-4 character.
+
+    @return  True if nChar is valid within an RFC 2047 <token> (US-ASCII
+    'A'--'Z', 'a'--'z', '0'--'9', '!', '#', '$', '%', '&', ''', '*', '+',
+    '-', '.', '^', '_', '`', '{', '|', '}', or '~').
+ */
+bool isTokenChar(sal_uInt32 nChar)
+{
+    static const bool aMap[128]
+        = { false, false, false, false, false, false, false, false,
+            false, false, false, false, false, false, false, false,
+            false, false, false, false, false, false, false, false,
+            false, false, false, false, false, false, false, false,
+            false,  true, false,  true,  true,  true,  true,  true, // !"#$%&'
+            false, false,  true,  true, false,  true,  true, false, //()*+,-./
+             true,  true,  true,  true,  true,  true,  true,  true, //01234567
+             true,  true, false, false, false, false, false, false, //89:;<=>?
+            false,  true,  true,  true,  true,  true,  true,  true, //@ABCDEFG
+             true,  true,  true,  true,  true,  true,  true,  true, //HIJKLMNO
+             true,  true,  true,  true,  true,  true,  true,  true, //PQRSTUVW
+             true,  true,  true, false, false, false,  true,  true, //XYZ[\]^_
+             true,  true,  true,  true,  true,  true,  true,  true, //`abcdefg
+             true,  true,  true,  true,  true,  true,  true,  true, //hijklmno
+             true,  true,  true,  true,  true,  true,  true,  true, //pqrstuvw
+             true,  true,  true,  true,  true,  true,  true, false  //xyz{|}~
+          };
+    return rtl::isAscii(nChar) && aMap[nChar];
+}
+
+const sal_Unicode * skipComment(const sal_Unicode * pBegin,
+                                          const sal_Unicode * pEnd)
+{
+    DBG_ASSERT(pBegin && pBegin <= pEnd,
+               "skipComment(): Bad sequence");
+
+    if (pBegin != pEnd && *pBegin == '(')
+    {
+        sal_uInt32 nLevel = 0;
+        for (const sal_Unicode * p = pBegin; p != pEnd;)
+            switch (*p++)
+            {
+                case '(':
+                    ++nLevel;
+                    break;
+
+                case ')':
+                    if (--nLevel == 0)
+                        return p;
+                    break;
+
+                case '\\':
+                    if (p != pEnd)
+                        ++p;
+                    break;
+            }
+    }
+    return pBegin;
+}
+
+const sal_Unicode * skipLinearWhiteSpaceComment(const sal_Unicode *
+                                                              pBegin,
+                                                          const sal_Unicode *
+                                                              pEnd)
+{
+    DBG_ASSERT(pBegin && pBegin <= pEnd,
+               "skipLinearWhiteSpaceComment(): Bad sequence");
+
+    while (pBegin != pEnd)
+        switch (*pBegin)
+        {
+            case '\t':
+            case ' ':
+                ++pBegin;
+                break;
+
+            case 0x0D: // CR
+                if (startsWithLineFolding(pBegin, pEnd))
+                    pBegin += 3;
+                else
+                    return pBegin;
+                break;
+
+            case '(':
+            {
+                const sal_Unicode * p = skipComment(pBegin, pEnd);
+                if (p == pBegin)
+                    return pBegin;
+                pBegin = p;
+                break;
+            }
+
+            default:
+                return pBegin;
+        }
+    return pBegin;
+}
+
+const sal_Unicode * skipQuotedString(const sal_Unicode * pBegin,
+                                               const sal_Unicode * pEnd)
+{
+    DBG_ASSERT(pBegin && pBegin <= pEnd,
+               "skipQuotedString(): Bad sequence");
+
+    if (pBegin != pEnd && *pBegin == '"')
+        for (const sal_Unicode * p = pBegin + 1; p != pEnd;)
+            switch (*p++)
+            {
+                case 0x0D: // CR
+                    if (pEnd - p < 2 || *p++ != 0x0A // LF
+                        || !isWhiteSpace(*p++))
+                        return pBegin;
+                    break;
+
+                case '"':
+                    return p;
+
+                case '\\':
+                    if (p != pEnd)
+                        ++p;
+                    break;
+            }
+    return pBegin;
+}
+
+sal_Unicode const * scanParameters(sal_Unicode const * pBegin,
+                                             sal_Unicode const * pEnd,
+                                             INetContentTypeParameterList *
+                                                 pParameters)
+{
+    ParameterList aList;
+    sal_Unicode const * pParameterBegin = pBegin;
+    for (sal_Unicode const * p = pParameterBegin;;)
+    {
+        pParameterBegin = skipLinearWhiteSpaceComment(p, pEnd);
+        if (pParameterBegin == pEnd || *pParameterBegin != ';')
+            break;
+        p = pParameterBegin + 1;
+
+        sal_Unicode const * pAttributeBegin
+            = skipLinearWhiteSpaceComment(p, pEnd);
+        p = pAttributeBegin;
+        bool bDowncaseAttribute = false;
+        while (p != pEnd && isTokenChar(*p) && *p != '*')
+        {
+            bDowncaseAttribute = bDowncaseAttribute || rtl::isAsciiUpperCase(*p);
+            ++p;
+        }
+        if (p == pAttributeBegin)
+            break;
+        OString aAttribute(pAttributeBegin, p - pAttributeBegin, RTL_TEXTENCODING_ASCII_US);
+        if (bDowncaseAttribute)
+            aAttribute = aAttribute.toAsciiLowerCase();
+
+        sal_uInt32 nSection = 0;
+        if (p != pEnd && *p == '*')
+        {
+            ++p;
+            if (p != pEnd && rtl::isAsciiDigit(*p)
+                && !INetMIME::scanUnsigned(p, pEnd, false, nSection))
+                break;
+        }
+
+        bool bPresent = std::any_of(aList.begin(), aList.end(),
+                                    Parameter::IsSameSection{aAttribute, nSection});
+        if (bPresent)
+            break;
+
+        bool bExtended = false;
+        if (p != pEnd && *p == '*')
+        {
+            ++p;
+            bExtended = true;
+        }
+
+        p = skipLinearWhiteSpaceComment(p, pEnd);
+
+        if (p == pEnd || *p != '=')
+            break;
+
+        p = skipLinearWhiteSpaceComment(p + 1, pEnd);
+
+        OString aCharset;
+        OString aLanguage;
+        OString aValue;
+        if (bExtended)
+        {
+            if (nSection == 0)
+            {
+                sal_Unicode const * pCharsetBegin = p;
+                bool bDowncaseCharset = false;
+                while (p != pEnd && isTokenChar(*p) && *p != '\'')
+                {
+                    bDowncaseCharset = bDowncaseCharset || rtl::isAsciiUpperCase(*p);
+                    ++p;
+                }
+                if (p == pCharsetBegin)
+                    break;
+                if (pParameters)
+                {
+                    aCharset = OString(
+                        pCharsetBegin,
+                        p - pCharsetBegin,
+                        RTL_TEXTENCODING_ASCII_US);
+                    if (bDowncaseCharset)
+                        aCharset = aCharset.toAsciiLowerCase();
+                }
+
+                if (p == pEnd || *p != '\'')
+                    break;
+                ++p;
+
+                sal_Unicode const * pLanguageBegin = p;
+                bool bDowncaseLanguage = false;
+                int nLetters = 0;
+                for (; p != pEnd; ++p)
+                    if (rtl::isAsciiAlpha(*p))
+                    {
+                        if (++nLetters > 8)
+                            break;
+                        bDowncaseLanguage = bDowncaseLanguage
+                                            || rtl::isAsciiUpperCase(*p);
+                    }
+                    else if (*p == '-')
+                    {
+                        if (nLetters == 0)
+                            break;
+                        nLetters = 0;
+                    }
+                    else
+                        break;
+                if (nLetters == 0 || nLetters > 8)
+                    break;
+                if (pParameters)
+                {
+                    aLanguage = OString(
+                        pLanguageBegin,
+                        p - pLanguageBegin,
+                        RTL_TEXTENCODING_ASCII_US);
+                    if (bDowncaseLanguage)
+                        aLanguage = aLanguage.toAsciiLowerCase();
+                }
+
+                if (p == pEnd || *p != '\'')
+                    break;
+                ++p;
+            }
+            if (pParameters)
+            {
+                OStringBuffer aSink;
+                while (p != pEnd)
+                {
+                    auto q = p;
+                    sal_uInt32 nChar = INetMIME::getUTF32Character(q, pEnd);
+                    if (rtl::isAscii(nChar) && !isTokenChar(nChar))
+                        break;
+                    p = q;
+                    if (nChar == '%' && p + 1 < pEnd)
+                    {
+                        int nWeight1 = INetMIME::getHexWeight(p[0]);
+                        int nWeight2 = INetMIME::getHexWeight(p[1]);
+                        if (nWeight1 >= 0 && nWeight2 >= 0)
+                        {
+                            aSink.append(char(nWeight1 << 4 | nWeight2));
+                            p += 2;
+                            continue;
+                        }
+                    }
+                    writeUTF8(aSink, nChar);
+                }
+                aValue = aSink.makeStringAndClear();
+            }
+            else
+                while (p != pEnd && (isTokenChar(*p) || !rtl::isAscii(*p)))
+                    ++p;
+        }
+        else if (p != pEnd && *p == '"')
+            if (pParameters)
+            {
+                OStringBuffer aSink(256);
+                bool bInvalid = false;
+                for (++p;;)
+                {
+                    if (p == pEnd)
+                    {
+                        bInvalid = true;
+                        break;
+                    }
+                    sal_uInt32 nChar = INetMIME::getUTF32Character(p, pEnd);
+                    if (nChar == '"')
+                        break;
+                    else if (nChar == 0x0D) // CR
+                    {
+                        if (pEnd - p < 2 || *p++ != 0x0A // LF
+                            || !isWhiteSpace(*p))
+                        {
+                            bInvalid = true;
+                            break;
+                        }
+                        nChar = static_cast<unsigned char>(*p++);
+                    }
+                    else if (nChar == '\\')
+                    {
+                        if (p == pEnd)
+                        {
+                            bInvalid = true;
+                            break;
+                        }
+                        nChar = INetMIME::getUTF32Character(p, pEnd);
+                    }
+                    writeUTF8(aSink, nChar);
+                }
+                if (bInvalid)
+                    break;
+                aValue = aSink.makeStringAndClear();
+            }
+            else
+            {
+                sal_Unicode const * pStringEnd = skipQuotedString(p, pEnd);
+                if (p == pStringEnd)
+                    break;
+                p = pStringEnd;
+            }
+        else
+        {
+            sal_Unicode const * pTokenBegin = p;
+            while (p != pEnd && (isTokenChar(*p) || !rtl::isAscii(*p)))
+                ++p;
+            if (p == pTokenBegin)
+                break;
+            if (pParameters)
+                aValue = OString(
+                    pTokenBegin, p - pTokenBegin,
+                    RTL_TEXTENCODING_UTF8);
+        }
+        aList.emplace_front(Parameter{aAttribute, aCharset, aLanguage, aValue, nSection, bExtended});
+    }
+    aList.sort();
+    return parseParameters(aList, pParameters) ? pParameterBegin : pBegin;
+}
+
+bool equalIgnoreCase(const char * pBegin1,
+                               const char * pEnd1,
+                               const char * pString2)
+{
+    DBG_ASSERT(pBegin1 && pBegin1 <= pEnd1 && pString2,
+               "equalIgnoreCase(): Bad sequences");
+
+    while (*pString2 != 0)
+        if (pBegin1 == pEnd1
+            || (rtl::toAsciiUpperCase(static_cast<unsigned char>(*pBegin1++))
+                != rtl::toAsciiUpperCase(
+                    static_cast<unsigned char>(*pString2++))))
+            return false;
+    return pBegin1 == pEnd1;
+}
+
+struct EncodingEntry
+{
+    char const * m_aName;
+    rtl_TextEncoding m_eEncoding;
+};
+
+// The source for the following table is <ftp://ftp.iana.org/in-notes/iana/
+// assignments/character-sets> as of Jan, 21 2000 12:46:00, unless  otherwise
+// noted:
+EncodingEntry const aEncodingMap[]
+    = { { "US-ASCII", RTL_TEXTENCODING_ASCII_US },
+        { "ANSI_X3.4-1968", RTL_TEXTENCODING_ASCII_US },
+        { "ISO-IR-6", RTL_TEXTENCODING_ASCII_US },
+        { "ANSI_X3.4-1986", RTL_TEXTENCODING_ASCII_US },
+        { "ISO_646.IRV:1991", RTL_TEXTENCODING_ASCII_US },
+        { "ASCII", RTL_TEXTENCODING_ASCII_US },
+        { "ISO646-US", RTL_TEXTENCODING_ASCII_US },
+        { "US", RTL_TEXTENCODING_ASCII_US },
+        { "IBM367", RTL_TEXTENCODING_ASCII_US },
+        { "CP367", RTL_TEXTENCODING_ASCII_US },
+        { "CSASCII", RTL_TEXTENCODING_ASCII_US },
+        { "ISO-8859-1", RTL_TEXTENCODING_ISO_8859_1 },
+        { "ISO_8859-1:1987", RTL_TEXTENCODING_ISO_8859_1 },
+        { "ISO-IR-100", RTL_TEXTENCODING_ISO_8859_1 },
+        { "ISO_8859-1", RTL_TEXTENCODING_ISO_8859_1 },
+        { "LATIN1", RTL_TEXTENCODING_ISO_8859_1 },
+        { "L1", RTL_TEXTENCODING_ISO_8859_1 },
+        { "IBM819", RTL_TEXTENCODING_ISO_8859_1 },
+        { "CP819", RTL_TEXTENCODING_ISO_8859_1 },
+        { "CSISOLATIN1", RTL_TEXTENCODING_ISO_8859_1 },
+        { "ISO-8859-2", RTL_TEXTENCODING_ISO_8859_2 },
+        { "ISO_8859-2:1987", RTL_TEXTENCODING_ISO_8859_2 },
+        { "ISO-IR-101", RTL_TEXTENCODING_ISO_8859_2 },
+        { "ISO_8859-2", RTL_TEXTENCODING_ISO_8859_2 },
+        { "LATIN2", RTL_TEXTENCODING_ISO_8859_2 },
+        { "L2", RTL_TEXTENCODING_ISO_8859_2 },
+        { "CSISOLATIN2", RTL_TEXTENCODING_ISO_8859_2 },
+        { "ISO-8859-3", RTL_TEXTENCODING_ISO_8859_3 },
+        { "ISO_8859-3:1988", RTL_TEXTENCODING_ISO_8859_3 },
+        { "ISO-IR-109", RTL_TEXTENCODING_ISO_8859_3 },
+        { "ISO_8859-3", RTL_TEXTENCODING_ISO_8859_3 },
+        { "LATIN3", RTL_TEXTENCODING_ISO_8859_3 },
+        { "L3", RTL_TEXTENCODING_ISO_8859_3 },
+        { "CSISOLATIN3", RTL_TEXTENCODING_ISO_8859_3 },
+        { "ISO-8859-4", RTL_TEXTENCODING_ISO_8859_4 },
+        { "ISO_8859-4:1988", RTL_TEXTENCODING_ISO_8859_4 },
+        { "ISO-IR-110", RTL_TEXTENCODING_ISO_8859_4 },
+        { "ISO_8859-4", RTL_TEXTENCODING_ISO_8859_4 },
+        { "LATIN4", RTL_TEXTENCODING_ISO_8859_4 },
+        { "L4", RTL_TEXTENCODING_ISO_8859_4 },
+        { "CSISOLATIN4", RTL_TEXTENCODING_ISO_8859_4 },
+        { "ISO-8859-5", RTL_TEXTENCODING_ISO_8859_5 },
+        { "ISO_8859-5:1988", RTL_TEXTENCODING_ISO_8859_5 },
+        { "ISO-IR-144", RTL_TEXTENCODING_ISO_8859_5 },
+        { "ISO_8859-5", RTL_TEXTENCODING_ISO_8859_5 },
+        { "CYRILLIC", RTL_TEXTENCODING_ISO_8859_5 },
+        { "CSISOLATINCYRILLIC", RTL_TEXTENCODING_ISO_8859_5 },
+        { "ISO-8859-6", RTL_TEXTENCODING_ISO_8859_6 },
+        { "ISO_8859-6:1987", RTL_TEXTENCODING_ISO_8859_6 },
+        { "ISO-IR-127", RTL_TEXTENCODING_ISO_8859_6 },
+        { "ISO_8859-6", RTL_TEXTENCODING_ISO_8859_6 },
+        { "ECMA-114", RTL_TEXTENCODING_ISO_8859_6 },
+        { "ASMO-708", RTL_TEXTENCODING_ISO_8859_6 },
+        { "ARABIC", RTL_TEXTENCODING_ISO_8859_6 },
+        { "CSISOLATINARABIC", RTL_TEXTENCODING_ISO_8859_6 },
+        { "ISO-8859-7", RTL_TEXTENCODING_ISO_8859_7 },
+        { "ISO_8859-7:1987", RTL_TEXTENCODING_ISO_8859_7 },
+        { "ISO-IR-126", RTL_TEXTENCODING_ISO_8859_7 },
+        { "ISO_8859-7", RTL_TEXTENCODING_ISO_8859_7 },
+        { "ELOT_928", RTL_TEXTENCODING_ISO_8859_7 },
+        { "ECMA-118", RTL_TEXTENCODING_ISO_8859_7 },
+        { "GREEK", RTL_TEXTENCODING_ISO_8859_7 },
+        { "GREEK8", RTL_TEXTENCODING_ISO_8859_7 },
+        { "CSISOLATINGREEK", RTL_TEXTENCODING_ISO_8859_7 },
+        { "ISO-8859-8", RTL_TEXTENCODING_ISO_8859_8 },
+        { "ISO_8859-8:1988", RTL_TEXTENCODING_ISO_8859_8 },
+        { "ISO-IR-138", RTL_TEXTENCODING_ISO_8859_8 },
+        { "ISO_8859-8", RTL_TEXTENCODING_ISO_8859_8 },
+        { "HEBREW", RTL_TEXTENCODING_ISO_8859_8 },
+        { "CSISOLATINHEBREW", RTL_TEXTENCODING_ISO_8859_8 },
+        { "ISO-8859-9", RTL_TEXTENCODING_ISO_8859_9 },
+        { "ISO_8859-9:1989", RTL_TEXTENCODING_ISO_8859_9 },
+        { "ISO-IR-148", RTL_TEXTENCODING_ISO_8859_9 },
+        { "ISO_8859-9", RTL_TEXTENCODING_ISO_8859_9 },
+        { "LATIN5", RTL_TEXTENCODING_ISO_8859_9 },
+        { "L5", RTL_TEXTENCODING_ISO_8859_9 },
+        { "CSISOLATIN5", RTL_TEXTENCODING_ISO_8859_9 },
+        { "ISO-8859-14", RTL_TEXTENCODING_ISO_8859_14 }, // RFC 2047
+        { "ISO_8859-15", RTL_TEXTENCODING_ISO_8859_15 },
+        { "ISO-8859-15", RTL_TEXTENCODING_ISO_8859_15 }, // RFC 2047
+        { "MACINTOSH", RTL_TEXTENCODING_APPLE_ROMAN },
+        { "MAC", RTL_TEXTENCODING_APPLE_ROMAN },
+        { "CSMACINTOSH", RTL_TEXTENCODING_APPLE_ROMAN },
+        { "IBM437", RTL_TEXTENCODING_IBM_437 },
+        { "CP437", RTL_TEXTENCODING_IBM_437 },
+        { "437", RTL_TEXTENCODING_IBM_437 },
+        { "CSPC8CODEPAGE437", RTL_TEXTENCODING_IBM_437 },
+        { "IBM850", RTL_TEXTENCODING_IBM_850 },
+        { "CP850", RTL_TEXTENCODING_IBM_850 },
+        { "850", RTL_TEXTENCODING_IBM_850 },
+        { "CSPC850MULTILINGUAL", RTL_TEXTENCODING_IBM_850 },
+        { "IBM860", RTL_TEXTENCODING_IBM_860 },
+        { "CP860", RTL_TEXTENCODING_IBM_860 },
+        { "860", RTL_TEXTENCODING_IBM_860 },
+        { "CSIBM860", RTL_TEXTENCODING_IBM_860 },
+        { "IBM861", RTL_TEXTENCODING_IBM_861 },
+        { "CP861", RTL_TEXTENCODING_IBM_861 },
+        { "861", RTL_TEXTENCODING_IBM_861 },
+        { "CP-IS", RTL_TEXTENCODING_IBM_861 },
+        { "CSIBM861", RTL_TEXTENCODING_IBM_861 },
+        { "IBM863", RTL_TEXTENCODING_IBM_863 },
+        { "CP863", RTL_TEXTENCODING_IBM_863 },
+        { "863", RTL_TEXTENCODING_IBM_863 },
+        { "CSIBM863", RTL_TEXTENCODING_IBM_863 },
+        { "IBM865", RTL_TEXTENCODING_IBM_865 },
+        { "CP865", RTL_TEXTENCODING_IBM_865 },
+        { "865", RTL_TEXTENCODING_IBM_865 },
+        { "CSIBM865", RTL_TEXTENCODING_IBM_865 },
+        { "IBM775", RTL_TEXTENCODING_IBM_775 },
+        { "CP775", RTL_TEXTENCODING_IBM_775 },
+        { "CSPC775BALTIC", RTL_TEXTENCODING_IBM_775 },
+        { "IBM852", RTL_TEXTENCODING_IBM_852 },
+        { "CP852", RTL_TEXTENCODING_IBM_852 },
+        { "852", RTL_TEXTENCODING_IBM_852 },
+        { "CSPCP852", RTL_TEXTENCODING_IBM_852 },
+        { "IBM855", RTL_TEXTENCODING_IBM_855 },
+        { "CP855", RTL_TEXTENCODING_IBM_855 },
+        { "855", RTL_TEXTENCODING_IBM_855 },
+        { "CSIBM855", RTL_TEXTENCODING_IBM_855 },
+        { "IBM857", RTL_TEXTENCODING_IBM_857 },
+        { "CP857", RTL_TEXTENCODING_IBM_857 },
+        { "857", RTL_TEXTENCODING_IBM_857 },
+        { "CSIBM857", RTL_TEXTENCODING_IBM_857 },
+        { "IBM862", RTL_TEXTENCODING_IBM_862 },
+        { "CP862", RTL_TEXTENCODING_IBM_862 },
+        { "862", RTL_TEXTENCODING_IBM_862 },
+        { "CSPC862LATINHEBREW", RTL_TEXTENCODING_IBM_862 },
+        { "IBM864", RTL_TEXTENCODING_IBM_864 },
+        { "CP864", RTL_TEXTENCODING_IBM_864 },
+        { "CSIBM864", RTL_TEXTENCODING_IBM_864 },
+        { "IBM866", RTL_TEXTENCODING_IBM_866 },
+        { "CP866", RTL_TEXTENCODING_IBM_866 },
+        { "866", RTL_TEXTENCODING_IBM_866 },
+        { "CSIBM866", RTL_TEXTENCODING_IBM_866 },
+        { "IBM869", RTL_TEXTENCODING_IBM_869 },
+        { "CP869", RTL_TEXTENCODING_IBM_869 },
+        { "869", RTL_TEXTENCODING_IBM_869 },
+        { "CP-GR", RTL_TEXTENCODING_IBM_869 },
+        { "CSIBM869", RTL_TEXTENCODING_IBM_869 },
+        { "WINDOWS-1250", RTL_TEXTENCODING_MS_1250 },
+        { "WINDOWS-1251", RTL_TEXTENCODING_MS_1251 },
+        { "WINDOWS-1253", RTL_TEXTENCODING_MS_1253 },
+        { "WINDOWS-1254", RTL_TEXTENCODING_MS_1254 },
+        { "WINDOWS-1255", RTL_TEXTENCODING_MS_1255 },
+        { "WINDOWS-1256", RTL_TEXTENCODING_MS_1256 },
+        { "WINDOWS-1257", RTL_TEXTENCODING_MS_1257 },
+        { "WINDOWS-1258", RTL_TEXTENCODING_MS_1258 },
+        { "SHIFT_JIS", RTL_TEXTENCODING_SHIFT_JIS },
+        { "MS_KANJI", RTL_TEXTENCODING_SHIFT_JIS },
+        { "CSSHIFTJIS", RTL_TEXTENCODING_SHIFT_JIS },
+        { "GB2312", RTL_TEXTENCODING_GB_2312 },
+        { "CSGB2312", RTL_TEXTENCODING_GB_2312 },
+        { "BIG5", RTL_TEXTENCODING_BIG5 },
+        { "CSBIG5", RTL_TEXTENCODING_BIG5 },
+        { "EUC-JP", RTL_TEXTENCODING_EUC_JP },
+        { "EXTENDED_UNIX_CODE_PACKED_FORMAT_FOR_JAPANESE",
+          RTL_TEXTENCODING_EUC_JP },
+        { "CSEUCPKDFMTJAPANESE", RTL_TEXTENCODING_EUC_JP },
+        { "ISO-2022-JP", RTL_TEXTENCODING_ISO_2022_JP },
+        { "CSISO2022JP", RTL_TEXTENCODING_ISO_2022_JP },
+        { "ISO-2022-CN", RTL_TEXTENCODING_ISO_2022_CN },
+        { "KOI8-R", RTL_TEXTENCODING_KOI8_R },
+        { "CSKOI8R", RTL_TEXTENCODING_KOI8_R },
+        { "UTF-7", RTL_TEXTENCODING_UTF7 },
+        { "UTF-8", RTL_TEXTENCODING_UTF8 },
+        { "ISO-8859-10", RTL_TEXTENCODING_ISO_8859_10 }, // RFC 2047
+        { "ISO-8859-13", RTL_TEXTENCODING_ISO_8859_13 }, // RFC 2047
+        { "EUC-KR", RTL_TEXTENCODING_EUC_KR },
+        { "CSEUCKR", RTL_TEXTENCODING_EUC_KR },
+        { "ISO-2022-KR", RTL_TEXTENCODING_ISO_2022_KR },
+        { "CSISO2022KR", RTL_TEXTENCODING_ISO_2022_KR },
+        { "ISO-10646-UCS-4", RTL_TEXTENCODING_UCS4 },
+        { "CSUCS4", RTL_TEXTENCODING_UCS4 },
+        { "ISO-10646-UCS-2", RTL_TEXTENCODING_UCS2 },
+        { "CSUNICODE", RTL_TEXTENCODING_UCS2 } };
+
+rtl_TextEncoding getCharsetEncoding(char const * pBegin,
+                                              char const * pEnd)
+{
+    for (const EncodingEntry& i : aEncodingMap)
+        if (equalIgnoreCase(pBegin, pEnd, i.m_aName))
+            return i.m_eEncoding;
+    return RTL_TEXTENCODING_DONTKNOW;
+}
+
+}
+
+//  INetMIME
+
+// static
+bool INetMIME::isAtomChar(sal_uInt32 nChar)
+{
+    static const bool aMap[128]
+        = { false, false, false, false, false, false, false, false,
+            false, false, false, false, false, false, false, false,
+            false, false, false, false, false, false, false, false,
+            false, false, false, false, false, false, false, false,
+            false,  true, false,  true,  true,  true,  true,  true, // !"#$%&'
+            false, false,  true,  true, false,  true, false,  true, //()*+,-./
+             true,  true,  true,  true,  true,  true,  true,  true, //01234567
+             true,  true, false, false, false,  true, false,  true, //89:;<=>?
+            false,  true,  true,  true,  true,  true,  true,  true, //@ABCDEFG
+             true,  true,  true,  true,  true,  true,  true,  true, //HIJKLMNO
+             true,  true,  true,  true,  true,  true,  true,  true, //PQRSTUVW
+             true,  true,  true, false, false, false,  true,  true, //XYZ[\]^_
+             true,  true,  true,  true,  true,  true,  true,  true, //`abcdefg
+             true,  true,  true,  true,  true,  true,  true,  true, //hijklmno
+             true,  true,  true,  true,  true,  true,  true,  true, //pqrstuvw
+             true,  true,  true,  true,  true,  true,  true, false  //xyz{|}~
+          };
+    return rtl::isAscii(nChar) && aMap[nChar];
+}
+
+// static
+bool INetMIME::isIMAPAtomChar(sal_uInt32 nChar)
+{
+    static const bool aMap[128]
+        = { false, false, false, false, false, false, false, false,
+            false, false, false, false, false, false, false, false,
+            false, false, false, false, false, false, false, false,
+            false, false, false, false, false, false, false, false,
+            false,  true, false,  true,  true, false,  true,  true, // !"#$%&'
+            false, false, false,  true,  true,  true,  true,  true, //()*+,-./
+             true,  true,  true,  true,  true,  true,  true,  true, //01234567
+             true,  true,  true,  true,  true,  true,  true,  true, //89:;<=>?
+             true,  true,  true,  true,  true,  true,  true,  true, //@ABCDEFG
+             true,  true,  true,  true,  true,  true,  true,  true, //HIJKLMNO
+             true,  true,  true,  true,  true,  true,  true,  true, //PQRSTUVW
+             true,  true,  true,  true, false,  true,  true,  true, //XYZ[\]^_
+             true,  true,  true,  true,  true,  true,  true,  true, //`abcdefg
+             true,  true,  true,  true,  true,  true,  true,  true, //hijklmno
+             true,  true,  true,  true,  true,  true,  true,  true, //pqrstuvw
+             true,  true,  true, false,  true,  true,  true, false  //xyz{|}~
+          };
+    return rtl::isAscii(nChar) && aMap[nChar];
+}
+
+// static
+bool INetMIME::equalIgnoreCase(const sal_Unicode * pBegin1,
+                               const sal_Unicode * pEnd1,
+                               const char * pString2)
+{
+    DBG_ASSERT(pBegin1 && pBegin1 <= pEnd1 && pString2,
+               "INetMIME::equalIgnoreCase(): Bad sequences");
+
+    while (*pString2 != 0)
+        if (pBegin1 == pEnd1
+            || (rtl::toAsciiUpperCase(*pBegin1++)
+                != rtl::toAsciiUpperCase(
+                    static_cast<unsigned char>(*pString2++))))
+            return false;
+    return pBegin1 == pEnd1;
+}
+
+// static
+bool INetMIME::scanUnsigned(const sal_Unicode *& rBegin,
+                            const sal_Unicode * pEnd, bool bLeadingZeroes,
+                            sal_uInt32 & rValue)
+{
+    sal_uInt64 nTheValue = 0;
+    const sal_Unicode * p = rBegin;
+    for ( ; p != pEnd; ++p)
+    {
+        int nWeight = getWeight(*p);
+        if (nWeight < 0)
+            break;
+        nTheValue = 10 * nTheValue + nWeight;
+        if (nTheValue > std::numeric_limits< sal_uInt32 >::max())
+            return false;
+    }
+    if (nTheValue == 0 && (p == rBegin || (!bLeadingZeroes && p - rBegin != 1)))
+        return false;
+    rBegin = p;
+    rValue = sal_uInt32(nTheValue);
+    return true;
+}
+
+// static
+sal_Unicode const * INetMIME::scanContentType(
+    std::u16string_view rStr, OUString * pType,
+    OUString * pSubType, INetContentTypeParameterList * pParameters)
+{
+    sal_Unicode const * pBegin = rStr.data();
+    sal_Unicode const * pEnd = pBegin + rStr.size();
+    sal_Unicode const * p = skipLinearWhiteSpaceComment(pBegin, pEnd);
+    sal_Unicode const * pTypeBegin = p;
+    while (p != pEnd && isTokenChar(*p))
+    {
+        ++p;
+    }
+    if (p == pTypeBegin)
+        return nullptr;
+    sal_Unicode const * pTypeEnd = p;
+
+    p = skipLinearWhiteSpaceComment(p, pEnd);
+    if (p == pEnd || *p++ != '/')
+        return nullptr;
+
+    p = skipLinearWhiteSpaceComment(p, pEnd);
+    sal_Unicode const * pSubTypeBegin = p;
+    while (p != pEnd && isTokenChar(*p))
+    {
+        ++p;
+    }
+    if (p == pSubTypeBegin)
+        return nullptr;
+    sal_Unicode const * pSubTypeEnd = p;
+
+    if (pType != nullptr)
+    {
+        *pType = OUString(pTypeBegin, pTypeEnd - pTypeBegin).toAsciiLowerCase();
+    }
+    if (pSubType != nullptr)
+    {
+        *pSubType = OUString(pSubTypeBegin, pSubTypeEnd - pSubTypeBegin)
+            .toAsciiLowerCase();
+    }
+
+    return scanParameters(p, pEnd, pParameters);
+}
+
+// static
+OUString INetMIME::decodeHeaderFieldBody(const OString& rBody)
+{
+    // Due to a bug in INetCoreRFC822MessageStream::ConvertTo7Bit(), old
+    // versions of StarOffice send mails with header fields where encoded
+    // words can be preceded by '=', ',', '.', '"', or '(', and followed by
+    // '=', ',', '.', '"', ')', without any required white space in between.
+    // And there appear to exist some broken mailers that only encode single
+    // letters within words, like "Appel
+    // =?iso-8859-1?Q?=E0?=t=?iso-8859-1?Q?=E9?=moin", so it seems best to
+    // detect encoded words even when not properly surrounded by white space.
+
+    // Non US-ASCII characters in rBody are treated as ISO-8859-1.
+
+    // encoded-word = "=?"
+    //     1*(%x21 / %x23-27 / %x2A-2B / %x2D / %30-39 / %x41-5A / %x5E-7E)
+    //     ["*" 1*8ALPHA *("-" 1*8ALPHA)] "?"
+    //     ("B?" *(4base64) (4base64 / 3base64 "=" / 2base64 "==")
+    //      / "Q?" 1*(%x21-3C / %x3E / %x40-7E / "=" 2HEXDIG))
+    //     "?="
+
+    // base64 = ALPHA / DIGIT / "+" / "/"
+
+    const char * pBegin = rBody.getStr();
+    const char * pEnd = pBegin + rBody.getLength();
+
+    OUStringBuffer sDecoded;
+    const char * pCopyBegin = pBegin;
+
+    /* bool bStartEncodedWord = true; */
+    const char * pWSPBegin = pBegin;
+
+    for (const char * p = pBegin; p != pEnd;)
+    {
+        if (*p == '=' /* && bStartEncodedWord */)
+        {
+            const char * q = p + 1;
+            bool bEncodedWord = q != pEnd && *q++ == '?';
+
+            rtl_TextEncoding eCharsetEncoding = RTL_TEXTENCODING_DONTKNOW;
+            if (bEncodedWord)
+            {
+                const char * pCharsetBegin = q;
+                const char * pLanguageBegin = nullptr;
+                int nAlphaCount = 0;
+                for (bool bDone = false; !bDone;)
+                    if (q == pEnd)
+                    {
+                        bEncodedWord = false;
+                        bDone = true;
+                    }
+                    else
+                    {
+                        char cChar = *q++;
+                        switch (cChar)
+                        {
+                            case '*':
+                                pLanguageBegin = q - 1;
+                                nAlphaCount = 0;
+                                break;
+
+                            case '-':
+                                if (pLanguageBegin != nullptr)
+                                {
+                                    if (nAlphaCount == 0)
+                                        pLanguageBegin = nullptr;
+                                    else
+                                        nAlphaCount = 0;
+                                }
+                                break;
+
+                            case '?':
+                                if (pCharsetBegin == q - 1)
+                                    bEncodedWord = false;
+                                else
+                                {
+                                    eCharsetEncoding
+                                        = getCharsetEncoding(
+                                              pCharsetBegin,
+                                              pLanguageBegin == nullptr
+                                              || nAlphaCount == 0 ?
+                                                  q - 1 : pLanguageBegin);
+                                    bEncodedWord = isMIMECharsetEncoding(
+                                                       eCharsetEncoding);
+                                    eCharsetEncoding
+                                        = translateFromMIME(eCharsetEncoding);
+                                }
+                                bDone = true;
+                                break;
+
+                            default:
+                                if (pLanguageBegin != nullptr
+                                    && (!rtl::isAsciiAlpha(
+                                            static_cast<unsigned char>(cChar))
+                                        || ++nAlphaCount > 8))
+                                    pLanguageBegin = nullptr;
+                                break;
+                        }
+                    }
+            }
+
+            bool bEncodingB = false;
+            if (bEncodedWord)
+            {
+                if (q == pEnd)
+                    bEncodedWord = false;
+                else
+                {
+                    switch (*q++)
+                    {
+                        case 'B':
+                        case 'b':
+                            bEncodingB = true;
+                            break;
+
+                        case 'Q':
+                        case 'q':
+                            bEncodingB = false;
+                            break;
+
+                        default:
+                            bEncodedWord = false;
+                            break;
+                    }
+                }
+            }
+
+            bEncodedWord = bEncodedWord && q != pEnd && *q++ == '?';
+
+            OStringBuffer sText;
+            if (bEncodedWord)
+            {
+                if (bEncodingB)
+                {
+                    for (bool bDone = false; !bDone;)
+                    {
+                        if (pEnd - q < 4)
+                        {
+                            bEncodedWord = false;
+                            bDone = true;
+                        }
+                        else
+                        {
+                            bool bFinal = false;
+                            int nCount = 3;
+                            sal_uInt32 nValue = 0;
+                            for (int nShift = 18; nShift >= 0; nShift -= 6)
+                            {
+                                int nWeight = getBase64Weight(*q++);
+                                if (nWeight == -2)
+                                {
+                                    bEncodedWord = false;
+                                    bDone = true;
+                                    break;
+                                }
+                                if (nWeight == -1)
+                                {
+                                    if (!bFinal)
+                                    {
+                                        if (nShift >= 12)
+                                        {
+                                            bEncodedWord = false;
+                                            bDone = true;
+                                            break;
+                                        }
+                                        bFinal = true;
+                                        nCount = nShift == 6 ? 1 : 2;
+                                    }
+                                }
+                                else
+                                    nValue |= nWeight << nShift;
+                            }
+                            if (bEncodedWord)
+                            {
+                                for (int nShift = 16; nCount-- > 0; nShift -= 8)
+                                    sText.append(char(nValue >> nShift & 0xFF));
+                                if (*q == '?')
+                                {
+                                    ++q;
+                                    bDone = true;
+                                }
+                                if (bFinal && !bDone)
+                                {
+                                    bEncodedWord = false;
+                                    bDone = true;
+                                }
+                            }
+                        }
+                    }
+                }
+                else
+                {
+                    const char * pEncodedTextBegin = q;
+                    const char * pEncodedTextCopyBegin = q;
+                    for (bool bDone = false; !bDone;)
+                        if (q == pEnd)
+                        {
+                            bEncodedWord = false;
+                            bDone = true;
+                        }
+                        else
+                        {
+                            sal_uInt32 nChar = static_cast<unsigned char>(*q++);
+                            switch (nChar)
+                            {
+                                case '=':
+                                {
+                                    if (pEnd - q < 2)
+                                    {
+                                        bEncodedWord = false;
+                                        bDone = true;
+                                        break;
+                                    }
+                                    int nDigit1 = getHexWeight(q[0]);
+                                    int nDigit2 = getHexWeight(q[1]);
+                                    if (nDigit1 < 0 || nDigit2 < 0)
+                                    {
+                                        bEncodedWord = false;
+                                        bDone = true;
+                                        break;
+                                    }
+                                    sText.append(rBody.subView(
+                                        (pEncodedTextCopyBegin - pBegin),
+                                        (q - 1 - pEncodedTextCopyBegin)));
+                                    sText.append(char(nDigit1 << 4 | nDigit2));
+                                    q += 2;
+                                    pEncodedTextCopyBegin = q;
+                                    break;
+                                }
+
+                                case '?':
+                                    if (q - pEncodedTextBegin > 1)
+                                        sText.append(rBody.subView(
+                                            (pEncodedTextCopyBegin - pBegin),
+                                            (q - 1 - pEncodedTextCopyBegin)));
+                                    else
+                                        bEncodedWord = false;
+                                    bDone = true;
+                                    break;
+
+                                case '_':
+                                    sText.append(rBody.subView(
+                                        (pEncodedTextCopyBegin - pBegin),
+                                        (q - 1 - pEncodedTextCopyBegin)));
+                                    sText.append(' ');
+                                    pEncodedTextCopyBegin = q;
+                                    break;
+
+                                default:
+                                    if (!isVisible(nChar))
+                                    {
+                                        bEncodedWord = false;
+                                        bDone = true;
+                                    }
+                                    break;
+                            }
+                        }
+                }
+            }
+
+            bEncodedWord = bEncodedWord && q != pEnd && *q++ == '=';
+
+            std::unique_ptr<sal_Unicode[]> pUnicodeBuffer;
+            sal_Size nUnicodeSize = 0;
+            if (bEncodedWord)
+            {
+                pUnicodeBuffer
+                    = convertToUnicode(sText.getStr(),
+                                       sText.getStr() + sText.getLength(),
+                                       eCharsetEncoding, nUnicodeSize);
+                if (!pUnicodeBuffer)
+                    bEncodedWord = false;
+            }
+
+            if (bEncodedWord)
+            {
+                appendISO88591(sDecoded, pCopyBegin, pWSPBegin);
+                sDecoded.append(
+                    pUnicodeBuffer.get(),
+                    static_cast< sal_Int32 >(nUnicodeSize));
+                pUnicodeBuffer.reset();
+                p = q;
+                pCopyBegin = p;
+
+                pWSPBegin = p;
+                while (p != pEnd && isWhiteSpace(*p))
+                    ++p;
+                /* bStartEncodedWord = p != pWSPBegin; */
+                continue;
+            }
+        }
+
+        if (p == pEnd)
+            break;
+
+        switch (*p++)
+        {
+            case '"':
+                /* bStartEncodedWord = true; */
+                break;
+
+            case '(':
+                /* bStartEncodedWord = true; */
+                break;
+
+            case ')':
+                /* bStartEncodedWord = false; */
+                break;
+
+            default:
+            {
+                const char * pUTF8Begin = p - 1;
+                const char * pUTF8End = pUTF8Begin;
+                sal_uInt32 nCharacter = 0;
+                if (translateUTF8Char(pUTF8End, pEnd, nCharacter))
+                {
+                    appendISO88591(sDecoded, pCopyBegin, p - 1);
+                    sDecoded.appendUtf32(nCharacter);
+                    p = pUTF8End;
+                    pCopyBegin = p;
+                }
+                /* bStartEncodedWord = false; */
+                break;
+            }
+        }
+        pWSPBegin = p;
+    }
+
+    appendISO88591(sDecoded, pCopyBegin, pEnd);
+    return sDecoded.makeStringAndClear();
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/tools/source/inet/inetmsg.cxx b/tools/source/inet/inetmsg.cxx
new file mode 100644
index 000000000..b2e7f70b4
--- /dev/null
+++ b/tools/source/inet/inetmsg.cxx
@@ -0,0 +1,292 @@
+/* -*- 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/types.h>
+#include <tools/datetime.hxx>
+#include <tools/inetmsg.hxx>
+#include <comphelper/string.hxx>
+#include <rtl/character.hxx>
+#include <o3tl/safeint.hxx>
+#include <o3tl/sprintf.hxx>
+#include <o3tl/string_view.hxx>
+
+#include <map>
+
+void INetMIMEMessage::SetHeaderField_Impl (
+    const OString &rName,
+    const OUString &rValue,
+    sal_uInt32 &rnIndex)
+{
+    SetHeaderField_Impl (
+        INetMessageHeader (rName, rValue.toUtf8()), rnIndex);
+}
+
+/* ParseDateField and local helper functions.
+ *
+ * Parses a String in (implied) GMT format into class Date and tools::Time objects.
+ * Four formats are accepted:
+ *
+ *  [Wkd,] 1*2DIGIT Mon 2*4DIGIT 00:00:00 [GMT]  (rfc1123)
+ *  [Wkd,] 00 Mon 0000 00:00:00 [GMT])           (rfc822, rfc1123)
+ *   Weekday, 00-Mon-00 00:00:00 [GMT]           (rfc850, rfc1036)
+ *   Wkd Mon 00 00:00:00 0000 [GMT]              (ctime)
+ *   1*DIGIT                                     (delta seconds)
+ */
+
+static const char *months[12] =
+{
+    "Jan", "Feb", "Mar", "Apr", "May", "Jun",
+    "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
+};
+
+static sal_uInt16 ParseNumber(std::string_view rStr, size_t& nIndex)
+{
+    size_t n = nIndex;
+    while ((n < rStr.size())
+           && rtl::isAsciiDigit(static_cast<unsigned char>(rStr[n])))
+        n++;
+
+    std::string_view aNum(rStr.substr(nIndex, (n - nIndex)));
+    nIndex = n;
+
+    return static_cast<sal_uInt16>(o3tl::toInt32(aNum));
+}
+
+static sal_uInt16 ParseMonth(std::string_view rStr, size_t& nIndex)
+{
+    size_t n = nIndex;
+    while ((n < rStr.size())
+           && rtl::isAsciiAlpha(static_cast<unsigned char>(rStr[n])))
+        n++;
+
+    std::string_view aMonth(rStr.substr(nIndex, 3));
+    nIndex = n;
+
+    sal_uInt16 i;
+    for (i = 0; i < 12; i++)
+        if (o3tl::equalsIgnoreAsciiCase(aMonth, months[i])) break;
+    return (i + 1);
+}
+
+bool INetMIMEMessage::ParseDateField (
+    std::u16string_view rDateFieldW, DateTime& rDateTime)
+{
+    OString aDateField(OUStringToOString(rDateFieldW,
+        RTL_TEXTENCODING_ASCII_US));
+
+    if (aDateField.isEmpty()) return false;
+
+    if (aDateField.indexOf(':') != -1)
+    {
+        // Some DateTime format.
+        size_t nIndex = 0;
+
+        // Skip over <Wkd> or <Weekday>, leading and trailing space.
+        while ((nIndex < o3tl::make_unsigned(aDateField.getLength())) &&
+               (aDateField[nIndex] == ' '))
+            nIndex++;
+
+        while (
+            (nIndex < o3tl::make_unsigned(aDateField.getLength())) &&
+            (rtl::isAsciiAlpha (static_cast<unsigned char>(aDateField[nIndex])) ||
+             (aDateField[nIndex] == ',')     ))
+            nIndex++;
+
+        while ((nIndex < o3tl::make_unsigned(aDateField.getLength())) &&
+               (aDateField[nIndex] == ' '))
+            nIndex++;
+
+        if (rtl::isAsciiAlpha (static_cast<unsigned char>(aDateField[nIndex])))
+        {
+            // Format: ctime().
+            if ((aDateField.getLength() - nIndex) < 20) return false;
+
+            rDateTime.SetMonth  (ParseMonth  (aDateField, nIndex)); nIndex++;
+            rDateTime.SetDay    (ParseNumber (aDateField, nIndex)); nIndex++;
+
+            rDateTime.SetHour   (ParseNumber (aDateField, nIndex)); nIndex++;
+            rDateTime.SetMin    (ParseNumber (aDateField, nIndex)); nIndex++;
+            rDateTime.SetSec    (ParseNumber (aDateField, nIndex)); nIndex++;
+            rDateTime.SetNanoSec (0);
+
+            sal_uInt16 nYear = ParseNumber (aDateField, nIndex);
+            if (nYear < 100) nYear += 1900;
+            rDateTime.SetYear   (nYear);
+        }
+        else
+        {
+            // Format: RFC1036 or RFC1123.
+            if ((aDateField.getLength() - nIndex) < 17) return false;
+
+            rDateTime.SetDay    (ParseNumber (aDateField, nIndex)); nIndex++;
+            rDateTime.SetMonth  (ParseMonth  (aDateField, nIndex)); nIndex++;
+
+            sal_uInt16 nYear  = ParseNumber (aDateField, nIndex);  nIndex++;
+            if (nYear < 100) nYear += 1900;
+            rDateTime.SetYear   (nYear);
+
+            rDateTime.SetHour   (ParseNumber (aDateField, nIndex)); nIndex++;
+            rDateTime.SetMin    (ParseNumber (aDateField, nIndex)); nIndex++;
+            rDateTime.SetSec    (ParseNumber (aDateField, nIndex)); nIndex++;
+            rDateTime.SetNanoSec (0);
+
+            const char cPossiblePlusMinus = nIndex < o3tl::make_unsigned(aDateField.getLength()) ? aDateField[nIndex] : 0;
+            if (cPossiblePlusMinus == '+' || cPossiblePlusMinus == '-')
+            {
+                // Offset from GMT: "(+|-)HHMM".
+                bool bEast   = (aDateField[nIndex++] == '+');
+                sal_uInt16 nOffset = ParseNumber (aDateField, nIndex);
+                if (nOffset > 0)
+                {
+                    tools::Time aDiff( tools::Time::EMPTY );
+                    aDiff.SetHour   (nOffset / 100);
+                    aDiff.SetMin    (nOffset % 100);
+                    aDiff.SetSec    (0);
+                    aDiff.SetNanoSec (0);
+
+                    if (bEast)
+                        rDateTime -= aDiff;
+                    else
+                        rDateTime += aDiff;
+                }
+            }
+        }
+    }
+    else if (comphelper::string::isdigitAsciiString(aDateField))
+    {
+        // Format: delta seconds.
+        tools::Time aDelta (0);
+        aDelta.SetTime (aDateField.toInt32() * 100);
+
+        DateTime aNow( DateTime::SYSTEM );
+        aNow += aDelta;
+        aNow.ConvertToUTC();
+
+        rDateTime.SetDate (aNow.GetDate());
+        rDateTime.SetTime (aNow.GetTime());
+    }
+    else
+    {
+        // Junk.
+        return false;
+    }
+
+    return (rDateTime.IsValidAndGregorian() &&
+            !((rDateTime.GetSec()  > 59) ||
+              (rDateTime.GetMin()  > 59) ||
+              (rDateTime.GetHour() > 23)    ));
+}
+
+const std::map<InetMessageMime, const char*> ImplINetMIMEMessageHeaderData =
+{
+    { InetMessageMime::VERSION, "MIME-Version"},
+    { InetMessageMime::CONTENT_DISPOSITION, "Content-Disposition"},
+    { InetMessageMime::CONTENT_TYPE, "Content-Type"},
+    { InetMessageMime::CONTENT_TRANSFER_ENCODING, "Content-Transfer-Encoding"}
+};
+
+INetMIMEMessage::INetMIMEMessage()
+    : pParent(nullptr)
+{
+    for (sal_uInt16 i = 0; i < static_cast<int>(InetMessageMime::NUMHDR); i++)
+        m_nMIMEIndex[static_cast<InetMessageMime>(i)] = SAL_MAX_UINT32;
+}
+
+INetMIMEMessage::~INetMIMEMessage()
+{
+}
+
+void INetMIMEMessage::SetMIMEVersion (const OUString& rVersion)
+{
+    SetHeaderField_Impl (
+        ImplINetMIMEMessageHeaderData.at(InetMessageMime::VERSION), rVersion,
+        m_nMIMEIndex[InetMessageMime::VERSION]);
+}
+
+void INetMIMEMessage::SetContentDisposition (const OUString& rDisposition)
+{
+    SetHeaderField_Impl (
+        ImplINetMIMEMessageHeaderData.at(InetMessageMime::CONTENT_DISPOSITION), rDisposition,
+        m_nMIMEIndex[InetMessageMime::CONTENT_DISPOSITION]);
+}
+
+void INetMIMEMessage::SetContentType (const OUString& rType)
+{
+    SetHeaderField_Impl (
+        ImplINetMIMEMessageHeaderData.at(InetMessageMime::CONTENT_TYPE), rType,
+        m_nMIMEIndex[InetMessageMime::CONTENT_TYPE]);
+}
+
+void INetMIMEMessage::SetContentTransferEncoding (
+    const OUString& rEncoding)
+{
+    SetHeaderField_Impl (
+        ImplINetMIMEMessageHeaderData.at(InetMessageMime::CONTENT_TRANSFER_ENCODING), rEncoding,
+        m_nMIMEIndex[InetMessageMime::CONTENT_TRANSFER_ENCODING]);
+}
+
+OUString INetMIMEMessage::GetDefaultContentType()
+{
+    if (pParent != nullptr)
+    {
+        OUString aParentCT (pParent->GetContentType());
+        if (aParentCT.isEmpty())
+            aParentCT = pParent->GetDefaultContentType();
+
+        if (aParentCT.equalsIgnoreAsciiCase("multipart/digest"))
+            return "message/rfc822";
+    }
+    return "text/plain; charset=us-ascii";
+}
+
+void INetMIMEMessage::EnableAttachMultipartFormDataChild()
+{
+    // Check context.
+    if (IsContainer())
+        return;
+
+    // Generate a unique boundary from current time.
+    char sTail[16 + 1];
+    tools::Time aCurTime( tools::Time::SYSTEM );
+    sal_uInt64 nThis = reinterpret_cast< sal_uIntPtr >( this ); // we can be on a 64bit architecture
+    nThis = ( ( nThis >> 32 ) ^ nThis ) & SAL_MAX_UINT32;
+    o3tl::sprintf (sTail, "%08X%08X",
+             static_cast< unsigned int >(aCurTime.GetTime()),
+             static_cast< unsigned int >(nThis));
+    m_aBoundary = "------------_4D48";
+    m_aBoundary += sTail;
+
+    // Set header fields.
+    SetMIMEVersion("1.0");
+    SetContentType(
+        "multipart/form-data; boundary=" + OUString::fromUtf8(m_aBoundary));
+    SetContentTransferEncoding("7bit");
+}
+
+void INetMIMEMessage::AttachChild(std::unique_ptr<INetMIMEMessage> pChildMsg)
+{
+    assert(IsContainer());
+    if (IsContainer())
+    {
+        pChildMsg->pParent = this;
+        aChildren.push_back( std::move(pChildMsg) );
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/tools/source/inet/inetstrm.cxx b/tools/source/inet/inetstrm.cxx
new file mode 100644
index 000000000..c68b232d9
--- /dev/null
+++ b/tools/source/inet/inetstrm.cxx
@@ -0,0 +1,296 @@
+/* -*- 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 <tools/inetmsg.hxx>
+#include <tools/inetstrm.hxx>
+
+int INetMIMEMessageStream::GetHeaderLine(char* pData, sal_uInt32 nSize)
+{
+    char* pWBuf = pData;
+
+    sal_uInt32 i, n;
+
+    if (maMsgBuffer.Tell() == 0)
+    {
+        // Insert formatted header into buffer.
+        n = pSourceMsg->GetHeaderCount();
+        for (i = 0; i < n; i++)
+        {
+            INetMessageHeader aHeader (pSourceMsg->GetHeaderField(i));
+            if (aHeader.GetValue().getLength())
+            {
+                // NYI: Folding long lines.
+                maMsgBuffer.WriteOString( aHeader.GetName() );
+                maMsgBuffer.WriteCharPtr( ": " );
+                maMsgBuffer.WriteOString( aHeader.GetValue() );
+                maMsgBuffer.WriteCharPtr( "\r\n" );
+            }
+        }
+
+        pMsgWrite = const_cast<char *>(static_cast<char const *>(maMsgBuffer.GetData()));
+        pMsgRead  = pMsgWrite + maMsgBuffer.Tell();
+    }
+
+    n = pMsgRead - pMsgWrite;
+    if (n > 0)
+    {
+        // Move to caller.
+        if (nSize < n) n = nSize;
+        for (i = 0; i < n; i++) *pWBuf++ = *pMsgWrite++;
+    }
+    else
+    {
+        // Reset buffer.
+        maMsgBuffer.Seek(STREAM_SEEK_TO_BEGIN);
+    }
+
+    return (pWBuf - pData);
+}
+
+int INetMIMEMessageStream::GetBodyLine(char* pData, sal_uInt32 nSize)
+{
+    char* pWBuf = pData;
+    char* pWEnd = pData + nSize;
+
+    if (pSourceMsg->GetDocumentLB())
+    {
+        if (pMsgStrm == nullptr)
+            pMsgStrm.reset(new SvStream (pSourceMsg->GetDocumentLB()));
+
+        sal_uInt32 nRead = pMsgStrm->ReadBytes(pWBuf, (pWEnd - pWBuf));
+        pWBuf += nRead;
+    }
+
+    return (pWBuf - pData);
+}
+
+int INetMIMEMessageStream::GetMsgLine(char* pData, sal_uInt32 nSize)
+{
+    // Check for header or body.
+    if (!bHeaderGenerated)
+    {
+        if (!done)
+        {
+            // Prepare special header fields.
+            if (pSourceMsg->GetParent())
+            {
+                OUString aPCT(pSourceMsg->GetParent()->GetContentType());
+                if (aPCT.startsWithIgnoreAsciiCase("message/rfc822"))
+                    pSourceMsg->SetMIMEVersion("1.0");
+                else
+                    pSourceMsg->SetMIMEVersion(OUString());
+            }
+            else
+            {
+                pSourceMsg->SetMIMEVersion("1.0");
+            }
+
+            // Check ContentType.
+            OUString aContentType(pSourceMsg->GetContentType());
+            if (!aContentType.isEmpty())
+            {
+                // Determine default Content-Type.
+                OUString aDefaultType = pSourceMsg->GetDefaultContentType();
+
+                if (aDefaultType.equalsIgnoreAsciiCase(aContentType))
+                {
+                    // No need to specify default.
+                    pSourceMsg->SetContentType(OUString());
+                }
+            }
+
+            // No need to specify default.
+            pSourceMsg->SetContentTransferEncoding(OUString());
+
+            // Mark we're done.
+            done = true;
+        }
+
+        // Generate the message header.
+        int nRead = GetHeaderLine(pData, nSize);
+        if (nRead <= 0)
+        {
+            // Reset state.
+            done = false;
+        }
+        return nRead;
+    }
+    else
+    {
+        // Generate the message body.
+        if (pSourceMsg->IsContainer())
+        {
+            // Encapsulated message body.
+            while (!done)
+            {
+                if (pChildStrm == nullptr)
+                {
+                    INetMIMEMessage *pChild = pSourceMsg->GetChild(nChildIndex);
+                    if (pChild)
+                    {
+                        // Increment child index.
+                        nChildIndex++;
+
+                        // Create child stream.
+                        pChildStrm.reset(new INetMIMEMessageStream(pChild, false));
+
+                        if (pSourceMsg->IsMultipart())
+                        {
+                            // Insert multipart delimiter.
+                            OString aDelim = "--" +
+                                pSourceMsg->GetMultipartBoundary() +
+                                "\r\n";
+
+                            memcpy(pData, aDelim.getStr(),
+                                aDelim.getLength());
+                            return aDelim.getLength();
+                        }
+                    }
+                    else
+                    {
+                        // No more parts. Mark we're done.
+                        done = true;
+                        nChildIndex = 0;
+
+                        if (pSourceMsg->IsMultipart())
+                        {
+                            // Insert close delimiter.
+                            OString aDelim = "--" +
+                                pSourceMsg->GetMultipartBoundary() +
+                                "--\r\n";
+
+                            memcpy(pData, aDelim.getStr(),
+                                aDelim.getLength());
+                            return aDelim.getLength();
+                        }
+                    }
+                }
+                else
+                {
+                    // Read current child stream.
+                    int nRead = pChildStrm->Read(pData, nSize);
+                    if (nRead > 0)
+                    {
+                        return nRead;
+                    }
+                    else
+                    {
+                        // Cleanup exhausted child stream.
+                        pChildStrm.reset();
+                    }
+                }
+            }
+            return 0;
+        }
+        else
+        {
+            // Single part message body.
+            if (pSourceMsg->GetDocumentLB() == nullptr)
+            {
+                // Empty message body.
+                return 0;
+            }
+
+            // No Encoding.
+            return GetBodyLine(pData, nSize);
+        }
+    }
+}
+
+namespace
+{
+
+const int BUFFER_SIZE = 2048;
+
+}
+
+INetMIMEMessageStream::INetMIMEMessageStream(
+    INetMIMEMessage *pMsg, bool headerGenerated):
+    pSourceMsg(pMsg),
+    bHeaderGenerated(headerGenerated),
+    mvBuffer(BUFFER_SIZE),
+    pMsgRead(nullptr),
+    pMsgWrite(nullptr),
+    done(false),
+    nChildIndex(0)
+{
+    assert(pMsg != nullptr);
+    maMsgBuffer.SetStreamCharSet(RTL_TEXTENCODING_ASCII_US);
+    pRead = pWrite = mvBuffer.data();
+}
+
+INetMIMEMessageStream::~INetMIMEMessageStream()
+{
+    pChildStrm.reset();
+}
+
+int INetMIMEMessageStream::Read(char* pData, sal_uInt32 nSize)
+{
+    char* pWBuf = pData;
+    char* pWEnd = pData + nSize;
+
+    while (pWBuf < pWEnd)
+    {
+        // Caller's buffer not yet filled.
+        sal_uInt32 n = pRead - pWrite;
+        if (n > 0)
+        {
+            // Bytes still in buffer.
+            sal_uInt32 m = pWEnd - pWBuf;
+            if (m < n) n = m;
+            for (sal_uInt32 i = 0; i < n; i++) *pWBuf++ = *pWrite++;
+        }
+        else
+        {
+            // Buffer empty. Reset to <Begin-of-Buffer>.
+            pRead = pWrite = mvBuffer.data();
+
+            // Read next message line.
+            int nRead = GetMsgLine(mvBuffer.data(), mvBuffer.size());
+            if (nRead > 0)
+            {
+                // Set read pointer.
+                pRead = mvBuffer.data() + nRead;
+            }
+            else
+            {
+                if (!bHeaderGenerated)
+                {
+                    // Header generated. Insert empty line.
+                    bHeaderGenerated = true;
+                    *pRead++ = '\r';
+                    *pRead++ = '\n';
+                }
+                else
+                {
+                    // Body generated.
+                    return (pWBuf - pData);
+                }
+            }
+        }
+    }
+    return (pWBuf - pData);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */