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1 /*
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2 * Copyright 1997-2003 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 // Low-level interface for UTF8 strings
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26
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27 class UTF8 : AllStatic {
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28 public:
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29 // returns the unicode length of a 0-terminated uft8 string
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30 static int unicode_length(const char* uft8_str);
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31
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32 // returns the unicode length of a non-0-terminated uft8 string
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33 static int unicode_length(const char* uft8_str, int len);
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34
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35 // converts a uft8 string to a unicode string
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36 static void convert_to_unicode(const char* utf8_str, jchar* unicode_buffer, int unicode_length);
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37
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38 // decodes the current utf8 character, stores the result in value,
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39 // and returns the end of the current uft8 chararacter.
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40 static char* next(const char* str, jchar* value);
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41
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42 // decodes the current utf8 character, gets the supplementary character instead of
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43 // the surrogate pair when seeing a supplementary character in string,
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44 // stores the result in value, and returns the end of the current uft8 chararacter.
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45 static char* next_character(const char* str, jint* value);
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46
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47 // Utility methods
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48 static jbyte* strrchr(jbyte* base, int length, jbyte c);
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49 static bool equal(jbyte* base1, int length1, jbyte* base2, int length2);
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50 static bool is_supplementary_character(const unsigned char* str);
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51 static jint get_supplementary_character(const unsigned char* str);
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52 };
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53
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54
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55 // Low-level interface for UNICODE strings
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56
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57 // A unicode string represents a string in the UTF-16 format in which supplementary
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58 // characters are represented by surrogate pairs. Index values refer to char code
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59 // units, so a supplementary character uses two positions in a unicode string.
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60
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61 class UNICODE : AllStatic {
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62 public:
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63 // returns the utf8 size of a unicode character
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64 static int utf8_size(jchar c);
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65
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66 // returns the utf8 length of a unicode string
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67 static int utf8_length(jchar* base, int length);
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68
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69 // converts a unicode string to utf8 string
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70 static void convert_to_utf8(const jchar* base, int length, char* utf8_buffer);
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71
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72 // converts a unicode string to a utf8 string; result is allocated
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73 // in resource area unless a buffer is provided.
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74 static char* as_utf8(jchar* base, int length);
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75 static char* as_utf8(jchar* base, int length, char* buf, int buflen);
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76 };
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