/* * Copyright (c) 1997, 2022, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. *
*/
class UTF8 : AllStatic { public: // returns the unicode length of a 0-terminated utf8 string staticint unicode_length(constchar* utf8_str) { bool is_latin1, has_multibyte; return unicode_length(utf8_str, is_latin1, has_multibyte);
} staticint unicode_length(constchar* utf8_str, bool& is_latin1, bool& has_multibyte);
// returns the unicode length of a non-0-terminated utf8 string staticint unicode_length(constchar* utf8_str, int len) { bool is_latin1, has_multibyte; return unicode_length(utf8_str, len, is_latin1, has_multibyte);
} staticint unicode_length(constchar* utf8_str, int len, bool& is_latin1, bool& has_multibyte);
// converts a utf8 string to a unicode string template<typename T> staticvoid convert_to_unicode(constchar* utf8_str, T* unicode_str, int unicode_length);
// returns the quoted ascii length of a utf8 string staticint quoted_ascii_length(constchar* utf8_str, int utf8_length);
// converts a utf8 string to quoted ascii staticvoid as_quoted_ascii(constchar* utf8_str, int utf8_length, char* buf, int buflen);
#ifndef PRODUCT // converts a quoted ascii string to utf8 string. returns the original // string unchanged if nothing needs to be done. staticconstchar* from_quoted_ascii(constchar* quoted_ascii_string); #endif
// decodes the current utf8 character, stores the result in value, // and returns the end of the current utf8 character. template<typename T> staticchar* next(constchar* str, T* value);
// decodes the current utf8 character, gets the supplementary character instead of // the surrogate pair when seeing a supplementary character in string, // stores the result in value, and returns the end of the current utf8 character. staticchar* next_character(constchar* str, jint* value);
// Utility methods
// Returns NULL if 'c' it not found. This only works as long // as 'c' is an ASCII character staticconst jbyte* strrchr(const jbyte* base, int length, jbyte c) {
assert(length >= 0, "sanity check");
assert(c >= 0, "does not work for non-ASCII characters"); // Skip backwards in string until 'c' is found or end is reached while(--length >= 0 && base[length] != c); return (length < 0) ? NULL : &base[length];
} staticbool equal(const jbyte* base1, int length1, const jbyte* base2,int length2); staticbool is_supplementary_character(constunsignedchar* str); static jint get_supplementary_character(constunsignedchar* str);
staticbool is_legal_utf8(constunsignedchar* buffer, int length, bool version_leq_47);
};
// Low-level interface for UNICODE strings
// A unicode string represents a string in the UTF-16 format in which supplementary // characters are represented by surrogate pairs. Index values refer to char code // units, so a supplementary character uses two positions in a unicode string.
class UNICODE : AllStatic { public: // checks if the given unicode character can be encoded as latin1 staticbool is_latin1(jchar c);
// checks if the given string can be encoded as latin1 staticbool is_latin1(const jchar* base, int length);
// returns the utf8 size of a unicode character staticint utf8_size(jchar c); staticint utf8_size(jbyte c);
// returns the utf8 length of a unicode string template<typename T> staticint utf8_length(const T* base, int length);
// converts a unicode string to utf8 string staticvoid convert_to_utf8(const jchar* base, int length, char* utf8_buffer);
// converts a unicode string to a utf8 string; result is allocated // in resource area unless a buffer is provided. The unicode 'length' // parameter is set to the length of the result utf8 string. template<typename T> staticchar* as_utf8(const T* base, int& length); staticchar* as_utf8(const jchar* base, int length, char* buf, int buflen); staticchar* as_utf8(const jbyte* base, int length, char* buf, int buflen);
// returns the quoted ascii length of a unicode string template<typename T> staticint quoted_ascii_length(const T* base, int length);
// converts a unicode string to quoted ascii template<typename T> staticvoid as_quoted_ascii(const T* base, int length, char* buf, int buflen);
};
#endif// SHARE_UTILITIES_UTF8_HPP
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