2 * Copyright (C) 2011 The Android Open Source Project
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 #ifndef ART_RUNTIME_UTF_H_
18 #define ART_RUNTIME_UTF_H_
20 #include "base/macros.h"
21 #include "base/mutex.h"
27 * All UTF-8 in art is actually modified UTF-8. Mostly, this distinction
30 * See http://en.wikipedia.org/wiki/UTF-8#Modified_UTF-8 for the details.
35 template<class T> class PrimitiveArray;
36 typedef PrimitiveArray<uint16_t> CharArray;
40 * Returns the number of UTF-16 characters in the given modified UTF-8 string.
42 size_t CountModifiedUtf8Chars(const char* utf8);
43 size_t CountModifiedUtf8Chars(const char* utf8, size_t byte_count);
46 * Returns the number of modified UTF-8 bytes needed to represent the given
49 size_t CountUtf8Bytes(const uint16_t* chars, size_t char_count);
52 * Convert from Modified UTF-8 to UTF-16.
54 void ConvertModifiedUtf8ToUtf16(uint16_t* utf16_out, const char* utf8_in);
55 void ConvertModifiedUtf8ToUtf16(uint16_t* utf16_out, size_t out_chars,
56 const char* utf8_in, size_t in_bytes);
59 * Compare two modified UTF-8 strings as UTF-16 code point values in a non-locale sensitive manner
61 ALWAYS_INLINE int CompareModifiedUtf8ToModifiedUtf8AsUtf16CodePointValues(const char* utf8_1,
65 * Compare a null-terminated modified UTF-8 string with a UTF-16 string (not null-terminated)
66 * as code point values in a non-locale sensitive manner.
68 int CompareModifiedUtf8ToUtf16AsCodePointValues(const char* utf8, const uint16_t* utf16,
72 * Convert from UTF-16 to Modified UTF-8. Note that the output is _not_
73 * NUL-terminated. You probably need to call CountUtf8Bytes before calling
74 * this anyway, so if you want a NUL-terminated string, you know where to
77 void ConvertUtf16ToModifiedUtf8(char* utf8_out, size_t byte_count,
78 const uint16_t* utf16_in, size_t char_count);
81 * The java.lang.String hashCode() algorithm.
83 int32_t ComputeUtf16Hash(mirror::CharArray* chars, int32_t offset, size_t char_count)
84 SHARED_REQUIRES(Locks::mutator_lock_);
85 int32_t ComputeUtf16Hash(const uint16_t* chars, size_t char_count);
86 int32_t ComputeUtf16HashFromModifiedUtf8(const char* utf8, size_t utf16_length);
88 // Compute a hash code of a modified UTF-8 string. Not the standard java hash since it returns a
89 // uint32_t and hashes individual chars instead of codepoint words.
90 uint32_t ComputeModifiedUtf8Hash(const char* chars);
93 * Retrieve the next UTF-16 character or surrogate pair from a UTF-8 string.
94 * single byte, 2-byte and 3-byte UTF-8 sequences result in a single UTF-16
95 * character (possibly one half of a surrogate) whereas 4-byte UTF-8 sequences
96 * result in a surrogate pair. Use GetLeadingUtf16Char and GetTrailingUtf16Char
97 * to process the return value of this function.
99 * Advances "*utf8_data_in" to the start of the next character.
101 * WARNING: If a string is corrupted by dropping a '\0' in the middle
102 * of a multi byte sequence, you can end up overrunning the buffer with
103 * reads (and possibly with the writes if the length was computed and
104 * cached before the damage). For performance reasons, this function
105 * assumes that the string being parsed is known to be valid (e.g., by
106 * already being verified). Most strings we process here are coming
107 * out of dex files or other internal translations, so the only real
108 * risk comes from the JNI NewStringUTF call.
110 uint32_t GetUtf16FromUtf8(const char** utf8_data_in);
113 * Gets the leading UTF-16 character from a surrogate pair, or the sole
114 * UTF-16 character from the return value of GetUtf16FromUtf8.
116 ALWAYS_INLINE uint16_t GetLeadingUtf16Char(uint32_t maybe_pair);
119 * Gets the trailing UTF-16 character from a surrogate pair, or 0 otherwise
120 * from the return value of GetUtf16FromUtf8.
122 ALWAYS_INLINE uint16_t GetTrailingUtf16Char(uint32_t maybe_pair);
126 #endif // ART_RUNTIME_UTF_H_