Check in the pristine copy of ICU 4.6...

icu46/source/i18n/csr2022.h

+/*
+ **********************************************************************
+ *   Copyright (C) 2005-2006, International Business Machines
+ *   Corporation and others.  All Rights Reserved.
+ **********************************************************************
+ */
+
+#ifndef __CSR2022_H
+#define __CSR2022_H
+
+#include "unicode/utypes.h"
+
+#if !UCONFIG_NO_CONVERSION
+
+#include "csrecog.h"
+
+U_NAMESPACE_BEGIN
+
+/**
+ *  class CharsetRecog_2022  part of the ICU charset detection imlementation.
+ *                           This is a superclass for the individual detectors for
+ *                           each of the detectable members of the ISO 2022 family
+ *                           of encodings.
+ * 
+ *                           The separate classes are nested within this class.
+ * 
+ * @internal
+ */
+class CharsetRecog_2022 : public CharsetRecognizer
+{
+
+public:    
+    virtual ~CharsetRecog_2022() = 0;
+
+protected:
+
+    /**
+     * Matching function shared among the 2022 detectors JP, CN and KR
+     * Counts up the number of legal an unrecognized escape sequences in
+     * the sample of text, and computes a score based on the total number &
+     * the proportion that fit the encoding.
+     * 
+     * 
+     * @param text the byte buffer containing text to analyse
+     * @param textLen  the size of the text in the byte.
+     * @param escapeSequences the byte escape sequences to test for.
+     * @return match quality, in the range of 0-100.
+     */
+    int32_t match_2022(const uint8_t *text, int32_t textLen, const uint8_t escapeSequences[][5], int32_t escapeSequences_length);
+
+};
+
+class CharsetRecog_2022JP :public CharsetRecog_2022
+{
+public:        
+    virtual ~CharsetRecog_2022JP() {}
+
+    const char *getName() const;
+
+    int32_t match(InputText *textIn);
+};
+
+class CharsetRecog_2022KR :public CharsetRecog_2022 {
+public:       
+    virtual ~CharsetRecog_2022KR() {}
+
+    const char *getName() const;
+
+    int32_t match(InputText *textIn);
+
+};
+
+class CharsetRecog_2022CN :public CharsetRecog_2022
+{
+public:        
+    virtual ~CharsetRecog_2022CN() {}
+
+    const char* getName() const;
+
+    int32_t match(InputText *textIn);
+};
+
+U_NAMESPACE_END
+
+#endif
+#endif /* __CSR2022_H */