icuSources/i18n/csr2022.h

   1 /*
   2  **********************************************************************
   3  *   Copyright (C) 2005-2006, International Business Machines
   4  *   Corporation and others.  All Rights Reserved.
   5  **********************************************************************
   6  */
   7
   8 #ifndef __CSR2022_H
   9 #define __CSR2022_H
  10
  11 #include "unicode/utypes.h"
  12
  13 #if !UCONFIG_NO_CONVERSION
  14
  15 #include "csrecog.h"
  16
  17 U_NAMESPACE_BEGIN
  18
  19 /**
  20  *  class CharsetRecog_2022  part of the ICU charset detection imlementation.
  21  *                           This is a superclass for the individual detectors for
  22  *                           each of the detectable members of the ISO 2022 family
  23  *                           of encodings.
  24  *
  25  *                           The separate classes are nested within this class.
  26  *
  27  * @internal
  28  */
  29 class CharsetRecog_2022 : public CharsetRecognizer
  30 {
  31
  32 public:
  33     virtual ~CharsetRecog_2022() = 0;
  34
  35 protected:
  36
  37     /**
  38      * Matching function shared among the 2022 detectors JP, CN and KR
  39      * Counts up the number of legal an unrecognized escape sequences in
  40      * the sample of text, and computes a score based on the total number &
  41      * the proportion that fit the encoding.
  42      *
  43      *
  44      * @param text the byte buffer containing text to analyse
  45      * @param textLen  the size of the text in the byte.
  46      * @param escapeSequences the byte escape sequences to test for.
  47      * @return match quality, in the range of 0-100.
  48      */
  49     int32_t match_2022(const uint8_t *text, int32_t textLen, const uint8_t escapeSequences[][5], int32_t escapeSequences_length);
  50
  51 };
  52
  53 class CharsetRecog_2022JP :public CharsetRecog_2022
  54 {
  55 public:
  56     virtual ~CharsetRecog_2022JP() {}
  57
  58     const char *getName() const;
  59
  60     int32_t match(InputText *textIn);
  61 };
  62
  63 class CharsetRecog_2022KR :public CharsetRecog_2022 {
  64 public:
  65     virtual ~CharsetRecog_2022KR() {}
  66
  67     const char *getName() const;
  68
  69     int32_t match(InputText *textIn);
  70
  71 };
  72
  73 class CharsetRecog_2022CN :public CharsetRecog_2022
  74 {
  75 public:
  76     virtual ~CharsetRecog_2022CN() {}
  77
  78     const char* getName() const;
  79
  80     int32_t match(InputText *textIn);
  81 };
  82
  83 U_NAMESPACE_END
  84
  85 #endif
  86 #endif /* __CSR2022_H */