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Diffstat (limited to 'include/rtl/tencinfo.h')
| -rw-r--r-- | include/rtl/tencinfo.h | 280 |
1 files changed, 280 insertions, 0 deletions
diff --git a/include/rtl/tencinfo.h b/include/rtl/tencinfo.h new file mode 100644 index 000000000..74c3bb04f --- /dev/null +++ b/include/rtl/tencinfo.h @@ -0,0 +1,280 @@ +/* -*- 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 . + */ + +#ifndef INCLUDED_RTL_TENCINFO_H +#define INCLUDED_RTL_TENCINFO_H + +#include "sal/config.h" + +#include "rtl/textenc.h" +#include "sal/saldllapi.h" +#include "sal/types.h" + +#ifdef __cplusplus +extern "C" { +#endif + +// See rtl_TextEncodingInfo.Flags below for documentation on these values: +#define RTL_TEXTENCODING_INFO_CONTEXT ((sal_uInt32)0x00000001) +#define RTL_TEXTENCODING_INFO_ASCII ((sal_uInt32)0x00000002) +#define RTL_TEXTENCODING_INFO_UNICODE ((sal_uInt32)0x00000004) +#define RTL_TEXTENCODING_INFO_MULTIBYTE ((sal_uInt32)0x00000008) +#define RTL_TEXTENCODING_INFO_R2L ((sal_uInt32)0x00000010) +#define RTL_TEXTENCODING_INFO_7BIT ((sal_uInt32)0x00000020) +#define RTL_TEXTENCODING_INFO_SYMBOL ((sal_uInt32)0x00000040) +#define RTL_TEXTENCODING_INFO_MIME ((sal_uInt32)0x00000080) + +/** Information about a text encoding. + */ +typedef struct _rtl_TextEncodingInfo +{ + /** The size (in bytes) of this structure. Should be 12. + */ + sal_uInt32 StructSize; + + /** The minimum number of bytes needed to encode any character in the + given encoding. + + Can be rather meaningless for encodings that encode global state along + with the characters (e.g., ISO-2022 encodings). + */ + sal_uInt8 MinimumCharSize; + + /** The maximum number of bytes needed to encode any character in the + given encoding. + + Can be rather meaningless for encodings that encode global state along + with the characters (e.g., ISO-2022 encodings). + */ + sal_uInt8 MaximumCharSize; + + /** The average number of bytes needed to encode a character in the given + encoding. + */ + sal_uInt8 AverageCharSize; + + /** An unused byte, for padding. + */ + sal_uInt8 Reserved; + + /** Any combination of the RTL_TEXTENCODING_INFO flags. + + RTL_TEXTENCODING_INFO_CONTEXT: The encoding uses some mechanism (like + state-changing byte sequences) to switch between different modes (e.g., + to encode multiple character repertoires within the same byte ranges). + + Even if an encoding does not have the CONTEXT property, interpretation + of certain byte values within that encoding can depend on context (e.g., + a certain byte value could be either a single-byte character or a + subsequent byte of a multi-byte character). Likewise, the single shift + characters (SS2 and SS3) used by some of the EUC encodings (to denote + that the following bytes constitute a character from another character + repertoire) do not imply that encodings making use of these characters + have the CONTEXT property. Examples of encodings that do have the + CONTEXT property are the ISO-2022 encodings and UTF-7. + + RTL_TEXTENCODING_INFO_ASCII: The encoding is a superset of ASCII. More + specifically, any appearance of a byte in the range 0x20--7F denotes the + corresponding ASCII character (from SPACE to DELETE); in particular, + such a byte cannot be part of a multi-byte character. Note that the + ASCII control codes 0x00--1F are not included here, as they are used for + special purposes in some encodings. + + If an encoding has this property, it is easy to search for occurrences of + ASCII characters within strings of this encoding---you do not need to + keep track whether a byte in the range 0x20--7F really represents an + ASCII character or rather is part of some multi-byte character. + + The guarantees when mapping between Unicode and a given encoding with + the ASCII property are as follows: When mapping from Unicode to the + given encoding, U+0020--007F map to 0x20--7F (but there can also be + other Unicode characters mapping into the range 0x20--7F), and when + mapping from the given encoding to Unicode, 0x20--7F map to U+0020--007F + (again, there can also be other characters mapping into the range + U+0020--007F). In particular, this ensures round-trip conversion for + the ASCII range. + + In principle, the ASCII property is orthogonal to the CONTEXT property. + In practice, however, an encoding that has the ASCII property will most + likely not also have the CONTEXT property. + + RTL_TEXTENCODING_INFO_UNICODE: The encoding is based on the Unicode + character repertoire. + + RTL_TEXTENCODING_INFO_MULTIBYTE: A multi-byte encoding. + + RTL_TEXTENCODING_INFO_R2L: An encoding used mainly or exclusively for + languages written from right to left. + + RTL_TEXTENCODING_INFO_7BIT: A 7-bit instead of an 8-bit encoding. + + RTL_TEXTENCODING_INFO_SYMBOL: A (generic) encoding for symbol character + sets. + + RTL_TEXTENCODING_INFO_MIME: The encoding is registered as a MIME + charset. + */ + sal_uInt32 Flags; +} rtl_TextEncodingInfo; + +/** Determine whether a text encoding uses single octets as basic units of + information (and can thus be used with the conversion routines in + rtl/textcvt.h). + + @param nEncoding + Any rtl_TextEncoding value. + + @return + True if the given encoding uses single octets as basic units of + information, false otherwise. + */ +SAL_DLLPUBLIC sal_Bool SAL_CALL rtl_isOctetTextEncoding(rtl_TextEncoding nEncoding); + +/** Return information about a text encoding. + + @param eTextEncoding + Any rtl_TextEncoding value. + + @param pEncInfo + Returns information about the given encoding. Must not be null, and the + StructSize member must be set correctly. + + @return + True if information about the given encoding is available, false + otherwise. + */ +SAL_DLLPUBLIC sal_Bool SAL_CALL rtl_getTextEncodingInfo( + rtl_TextEncoding eTextEncoding, rtl_TextEncodingInfo* pEncInfo ); + +/** Map from a numeric Windows charset to a text encoding. + + @param nWinCharset + Any numeric Windows charset. + + @return + The corresponding rtl_TextEncoding value, or RTL_TEXTENCODING_DONTKNOW if + no mapping is applicable. + If nWinCharset is 255 (OEM_CHARSET), then return value is RTL_TEXTENCODING_IBM_850, + regardless of current locale. + */ +SAL_DLLPUBLIC rtl_TextEncoding SAL_CALL rtl_getTextEncodingFromWindowsCharset( + sal_uInt8 nWinCharset ); + +/** Map from a MIME charset to a text encoding. + + @param pMimeCharset + Any MIME charset string. Must not be null. + + @return + The corresponding rtl_TextEncoding value, or RTL_TEXTENCODING_DONTKNOW if + no mapping is applicable. + */ +SAL_DLLPUBLIC rtl_TextEncoding SAL_CALL rtl_getTextEncodingFromMimeCharset( + const sal_Char* pMimeCharset ); + +/** Map from a Unix charset to a text encoding. + + @param pUnixCharset + Any Unix charset string. Must not be null. + + @return + The corresponding rtl_TextEncoding value, or RTL_TEXTENCODING_DONTKNOW if + no mapping is applicable. + */ +SAL_DLLPUBLIC rtl_TextEncoding SAL_CALL rtl_getTextEncodingFromUnixCharset( + const sal_Char* pUnixCharset ); + +/** Map from a text encoding to the best matching numeric Windows charset. + + @param eTextEncoding + Any rtl_TextEncoding value. + + @return + The best matching numeric Windows charset, or 1 if none matches. + */ +SAL_DLLPUBLIC sal_uInt8 SAL_CALL rtl_getBestWindowsCharsetFromTextEncoding( + rtl_TextEncoding eTextEncoding ); + +/** Map from a text encoding to a corresponding MIME charset name, if + available (see <http://www.iana.org/assignments/character-sets>). + + @param nEncoding + Any rtl_TextEncoding value. + + @return + The (preferred) MIME charset name corresponding to the given encoding, or + NULL if none is available. + */ +SAL_DLLPUBLIC char const * SAL_CALL rtl_getMimeCharsetFromTextEncoding( + rtl_TextEncoding nEncoding ); + +/** Map from a text encoding to the best matching MIME charset. + + @param eTextEncoding + Any rtl_TextEncoding value. + + @return + The best matching MIME charset string, or null if none matches. + */ +SAL_DLLPUBLIC const sal_Char* SAL_CALL rtl_getBestMimeCharsetFromTextEncoding( + rtl_TextEncoding eTextEncoding ); + +/** Map from a text encoding to the best matching Unix charset. + + @param eTextEncoding + Any rtl_TextEncoding value. + + @return + The best matching Unix charset string, or null if none matches. + */ +SAL_DLLPUBLIC const sal_Char* SAL_CALL rtl_getBestUnixCharsetFromTextEncoding( + rtl_TextEncoding eTextEncoding ); + +/** Map from a Windows code page to a text encoding. + + @param nCodePage + Any Windows code page number. + + @return + The corresponding rtl_TextEncoding value (which will be an octet text + encoding, see rtl_isOctetTextEncoding), or RTL_TEXTENCODING_DONTKNOW if no + mapping is applicable. + */ +SAL_DLLPUBLIC rtl_TextEncoding SAL_CALL +rtl_getTextEncodingFromWindowsCodePage(sal_uInt32 nCodePage); + +/** Map from a text encoding to a Windows code page. + + @param nEncoding + Any rtl_TextEncoding value. + + @return + The corresponding Windows code page number, or 0 if no mapping is + applicable. + */ +SAL_DLLPUBLIC sal_uInt32 SAL_CALL +rtl_getWindowsCodePageFromTextEncoding(rtl_TextEncoding nEncoding); + +#ifdef __cplusplus +} +#endif + +#endif // INCLUDED_RTL_TENCINFO_H + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |