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