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Diffstat (limited to 'intl/icu/source/i18n/csrmbcs.h')
| -rw-r--r-- | intl/icu/source/i18n/csrmbcs.h | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/intl/icu/source/i18n/csrmbcs.h b/intl/icu/source/i18n/csrmbcs.h new file mode 100644 index 0000000000..ff7fc4e2a7 --- /dev/null +++ b/intl/icu/source/i18n/csrmbcs.h @@ -0,0 +1,207 @@ +// © 2016 and later: Unicode, Inc. and others. +// License & terms of use: http://www.unicode.org/copyright.html +/* + ********************************************************************** + * Copyright (C) 2005-2012, International Business Machines + * Corporation and others. All Rights Reserved. + ********************************************************************** + */ + +#ifndef __CSRMBCS_H +#define __CSRMBCS_H + +#include "unicode/utypes.h" + +#if !UCONFIG_NO_CONVERSION + +#include "csrecog.h" + +U_NAMESPACE_BEGIN + +// "Character" iterated character class. +// Recognizers for specific mbcs encodings make their "characters" available +// by providing a nextChar() function that fills in an instance of IteratedChar +// with the next char from the input. +// The returned characters are not converted to Unicode, but remain as the raw +// bytes (concatenated into an int) from the codepage data. +// +// For Asian charsets, use the raw input rather than the input that has been +// stripped of markup. Detection only considers multi-byte chars, effectively +// stripping markup anyway, and double byte chars do occur in markup too. +// +class IteratedChar : public UMemory +{ +public: + uint32_t charValue; // 1-4 bytes from the raw input data + int32_t index; + int32_t nextIndex; + UBool error; + UBool done; + +public: + IteratedChar(); + //void reset(); + int32_t nextByte(InputText* det); +}; + + +class CharsetRecog_mbcs : public CharsetRecognizer { + +protected: + /** + * Test the match of this charset with the input text data + * which is obtained via the CharsetDetector object. + * + * @param det The CharsetDetector, which contains the input text + * to be checked for being in this charset. + * @return Two values packed into one int (Damn java, anyhow) + * <br/> + * bits 0-7: the match confidence, ranging from 0-100 + * <br/> + * bits 8-15: The match reason, an enum-like value. + */ + int32_t match_mbcs(InputText* det, const uint16_t commonChars[], int32_t commonCharsLen) const; + +public: + + virtual ~CharsetRecog_mbcs(); + + /** + * Get the IANA name of this charset. + * @return the charset name. + */ + + const char *getName() const override = 0; + const char *getLanguage() const override = 0; + UBool match(InputText* input, CharsetMatch *results) const override = 0; + + /** + * Get the next character (however many bytes it is) from the input data + * Subclasses for specific charset encodings must implement this function + * to get characters according to the rules of their encoding scheme. + * + * This function is not a method of class IteratedChar only because + * that would require a lot of extra derived classes, which is awkward. + * @param it The IteratedChar "struct" into which the returned char is placed. + * @param det The charset detector, which is needed to get at the input byte data + * being iterated over. + * @return True if a character was returned, false at end of input. + */ + virtual UBool nextChar(IteratedChar *it, InputText *textIn) const = 0; + +}; + + +/** + * Shift-JIS charset recognizer. + * + */ +class CharsetRecog_sjis : public CharsetRecog_mbcs { +public: + virtual ~CharsetRecog_sjis(); + + UBool nextChar(IteratedChar *it, InputText *det) const override; + + UBool match(InputText* input, CharsetMatch *results) const override; + + const char *getName() const override; + const char *getLanguage() const override; + +}; + + +/** + * EUC charset recognizers. One abstract class that provides the common function + * for getting the next character according to the EUC encoding scheme, + * and nested derived classes for EUC_KR, EUC_JP, EUC_CN. + * + */ +class CharsetRecog_euc : public CharsetRecog_mbcs +{ +public: + virtual ~CharsetRecog_euc(); + + const char *getName() const override = 0; + const char *getLanguage() const override = 0; + + UBool match(InputText* input, CharsetMatch *results) const override = 0; + /* + * (non-Javadoc) + * Get the next character value for EUC based encodings. + * Character "value" is simply the raw bytes that make up the character + * packed into an int. + */ + UBool nextChar(IteratedChar *it, InputText *det) const override; +}; + +/** + * The charset recognize for EUC-JP. A singleton instance of this class + * is created and kept by the public CharsetDetector class + */ +class CharsetRecog_euc_jp : public CharsetRecog_euc +{ +public: + virtual ~CharsetRecog_euc_jp(); + + const char *getName() const override; + const char *getLanguage() const override; + + UBool match(InputText* input, CharsetMatch *results) const override; +}; + +/** + * The charset recognize for EUC-KR. A singleton instance of this class + * is created and kept by the public CharsetDetector class + */ +class CharsetRecog_euc_kr : public CharsetRecog_euc +{ +public: + virtual ~CharsetRecog_euc_kr(); + + const char *getName() const override; + const char *getLanguage() const override; + + UBool match(InputText* input, CharsetMatch *results) const override; +}; + +/** + * + * Big5 charset recognizer. + * + */ +class CharsetRecog_big5 : public CharsetRecog_mbcs +{ +public: + virtual ~CharsetRecog_big5(); + + UBool nextChar(IteratedChar* it, InputText* det) const override; + + const char *getName() const override; + const char *getLanguage() const override; + + UBool match(InputText* input, CharsetMatch *results) const override; +}; + + +/** + * + * GB-18030 recognizer. Uses simplified Chinese statistics. + * + */ +class CharsetRecog_gb_18030 : public CharsetRecog_mbcs +{ +public: + virtual ~CharsetRecog_gb_18030(); + + UBool nextChar(IteratedChar* it, InputText* det) const override; + + const char *getName() const override; + const char *getLanguage() const override; + + UBool match(InputText* input, CharsetMatch *results) const override; +}; + +U_NAMESPACE_END + +#endif +#endif /* __CSRMBCS_H */ |