Check in the pristine copy of ICU 4.6...

icu46/source/i18n/csrmbcs.h

+/*
+ **********************************************************************
+ *   Copyright (C) 2005-2008, 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);
+
+public:
+
+    virtual ~CharsetRecog_mbcs();
+
+    /**
+     * Get the IANA name of this charset.
+     * @return the charset name.
+     */
+
+    const char *getName() const = 0;
+    const char *getLanguage() const = 0;
+    int32_t match(InputText* det) = 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) = 0;
+
+};
+
+
+/**
+ *   Shift-JIS charset recognizer.
+ *
+ */
+class CharsetRecog_sjis : public CharsetRecog_mbcs {
+public:
+    virtual ~CharsetRecog_sjis();
+
+    UBool nextChar(IteratedChar *it, InputText *det);
+
+    int32_t match(InputText *det);
+
+    const char *getName() const;
+    const char *getLanguage() const;
+
+};
+
+
+/**
+ *   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 = 0;
+    const char *getLanguage() const = 0;
+
+    int32_t match(InputText* det) = 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);
+};
+
+/**
+ * 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;
+    const char *getLanguage() const;
+
+    int32_t match(InputText *det);
+};
+
+/**
+ * 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;
+    const char *getLanguage() const;
+
+    int32_t match(InputText *det);
+};
+
+/**
+ *
+ *   Big5 charset recognizer.
+ *
+ */
+class CharsetRecog_big5 : public CharsetRecog_mbcs
+{
+public:
+    virtual ~CharsetRecog_big5();
+
+    UBool nextChar(IteratedChar* it, InputText* det);
+
+    const char *getName() const;
+    const char *getLanguage() const;
+
+    int32_t match(InputText *det);
+};
+
+
+/**
+ *
+ *   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 char *getName() const;
+    const char *getLanguage() const;
+
+    int32_t match(InputText *det);
+};
+
+U_NAMESPACE_END
+
+#endif
+#endif /* __CSRMBCS_H */