icuSources/i18n/csr2022.h

   1 // © 2016 and later: Unicode, Inc. and others.
   2 // License & terms of use: http://www.unicode.org/copyright.html
   3 /*
   4  **********************************************************************
   5  *   Copyright (C) 2005-2015, International Business Machines
   6  *   Corporation and others.  All Rights Reserved.
   7  **********************************************************************
   8  */
   9
  10 #ifndef __CSR2022_H
  11 #define __CSR2022_H
  12
  13 #include "unicode/utypes.h"
  14
  15 #if !UCONFIG_NO_CONVERSION
  16
  17 #include "csrecog.h"
  18
  19 U_NAMESPACE_BEGIN
  20
  21 class CharsetMatch;
  22
  23 /**
  24  *  class CharsetRecog_2022  part of the ICU charset detection imlementation.
  25  *                           This is a superclass for the individual detectors for
  26  *                           each of the detectable members of the ISO 2022 family
  27  *                           of encodings.
  28  *
  29  *                           The separate classes are nested within this class.
  30  *
  31  * @internal
  32  */
  33 class CharsetRecog_2022 : public CharsetRecognizer
  34 {
  35
  36 public:
  37     virtual ~CharsetRecog_2022() = 0;
  38
  39 protected:
  40
  41     /**
  42      * Matching function shared among the 2022 detectors JP, CN and KR
  43      * Counts up the number of legal an unrecognized escape sequences in
  44      * the sample of text, and computes a score based on the total number &
  45      * the proportion that fit the encoding.
  46      *
  47      *
  48      * @param text the byte buffer containing text to analyse
  49      * @param textLen  the size of the text in the byte.
  50      * @param escapeSequences the byte escape sequences to test for.
  51      * @return match quality, in the range of 0-100.
  52      */
  53     int32_t match_2022(const uint8_t *text,
  54                        int32_t textLen,
  55                        const uint8_t escapeSequences[][5],
  56                        int32_t escapeSequences_length) const;
  57
  58 };
  59
  60 class CharsetRecog_2022JP :public CharsetRecog_2022
  61 {
  62 public:
  63     virtual ~CharsetRecog_2022JP();
  64
  65     const char *getName() const;
  66
  67     UBool match(InputText *textIn, CharsetMatch *results) const;
  68 };
  69
  70 #if !UCONFIG_ONLY_HTML_CONVERSION
  71 class CharsetRecog_2022KR :public CharsetRecog_2022 {
  72 public:
  73     virtual ~CharsetRecog_2022KR();
  74
  75     const char *getName() const;
  76
  77     UBool match(InputText *textIn, CharsetMatch *results) const;
  78
  79 };
  80
  81 class CharsetRecog_2022CN :public CharsetRecog_2022
  82 {
  83 public:
  84     virtual ~CharsetRecog_2022CN();
  85
  86     const char* getName() const;
  87
  88     UBool match(InputText *textIn, CharsetMatch *results) const;
  89 };
  90 #endif
  91
  92 U_NAMESPACE_END
  93
  94 #endif
  95 #endif /* __CSR2022_H */