1/*
2 **********************************************************************
3 *   Copyright (C) 2005-2012, 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
17U_NAMESPACE_BEGIN
18
19class 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 */
31class CharsetRecog_2022 : public CharsetRecognizer
32{
33
34public:
35    virtual ~CharsetRecog_2022() = 0;
36
37protected:
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
58class CharsetRecog_2022JP :public CharsetRecog_2022
59{
60public:
61    virtual ~CharsetRecog_2022JP();
62
63    const char *getName() const;
64
65    UBool match(InputText *textIn, CharsetMatch *results) const;
66};
67
68class CharsetRecog_2022KR :public CharsetRecog_2022 {
69public:
70    virtual ~CharsetRecog_2022KR();
71
72    const char *getName() const;
73
74    UBool match(InputText *textIn, CharsetMatch *results) const;
75
76};
77
78class CharsetRecog_2022CN :public CharsetRecog_2022
79{
80public:
81    virtual ~CharsetRecog_2022CN();
82
83    const char* getName() const;
84
85    UBool match(InputText *textIn, CharsetMatch *results) const;
86};
87
88U_NAMESPACE_END
89
90#endif
91#endif /* __CSR2022_H */
92