1 /* 2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_UTILITIES_UTF8_HPP 26 #define SHARE_VM_UTILITIES_UTF8_HPP 27 28 #include "memory/allocation.hpp" 29 #include "utilities/top.hpp" 30 31 // Low-level interface for UTF8 strings 32 33 class UTF8 : AllStatic { 34 public: 35 // returns the unicode length of a 0-terminated uft8 string 36 static int unicode_length(const char* uft8_str); 37 38 // returns the unicode length of a non-0-terminated uft8 string 39 static int unicode_length(const char* uft8_str, int len); 40 41 // converts a uft8 string to a unicode string 42 static void convert_to_unicode(const char* utf8_str, jchar* unicode_buffer, int unicode_length); 43 44 // decodes the current utf8 character, stores the result in value, 45 // and returns the end of the current uft8 chararacter. 46 static char* next(const char* str, jchar* value); 47 48 // decodes the current utf8 character, gets the supplementary character instead of 49 // the surrogate pair when seeing a supplementary character in string, 50 // stores the result in value, and returns the end of the current uft8 chararacter. 51 static char* next_character(const char* str, jint* value); 52 53 // Utility methods 54 static jbyte* strrchr(jbyte* base, int length, jbyte c); 55 static bool equal(jbyte* base1, int length1, jbyte* base2, int length2); 56 static bool is_supplementary_character(const unsigned char* str); 57 static jint get_supplementary_character(const unsigned char* str); 58 }; 59 60 61 // Low-level interface for UNICODE strings 62 63 // A unicode string represents a string in the UTF-16 format in which supplementary 64 // characters are represented by surrogate pairs. Index values refer to char code 65 // units, so a supplementary character uses two positions in a unicode string. 66 67 class UNICODE : AllStatic { 68 public: 69 // returns the utf8 size of a unicode character 70 static int utf8_size(jchar c); 71 72 // returns the utf8 length of a unicode string 73 static int utf8_length(jchar* base, int length); 74 75 // converts a unicode string to utf8 string 76 static void convert_to_utf8(const jchar* base, int length, char* utf8_buffer); 77 78 // converts a unicode string to a utf8 string; result is allocated 79 // in resource area unless a buffer is provided. 80 static char* as_utf8(jchar* base, int length); 81 static char* as_utf8(jchar* base, int length, char* buf, int buflen); 82 }; 83 84 #endif // SHARE_VM_UTILITIES_UTF8_HPP