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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "utf.h"
#include "base/logging.h"
#include "mirror/array.h"
#include "mirror/object-inl.h"
#include "utf-inl.h"
namespace art {
size_t CountModifiedUtf8Chars(const char* utf8) {
size_t len = 0;
int ic;
while ((ic = *utf8++) != '\0') {
len++;
if ((ic & 0x80) == 0) {
// one-byte encoding
continue;
}
// two- or three-byte encoding
utf8++;
if ((ic & 0x20) == 0) {
// two-byte encoding
continue;
}
// three-byte encoding
utf8++;
}
return len;
}
void ConvertModifiedUtf8ToUtf16(uint16_t* utf16_data_out, const char* utf8_data_in) {
while (*utf8_data_in != '\0') {
*utf16_data_out++ = GetUtf16FromUtf8(&utf8_data_in);
}
}
void ConvertUtf16ToModifiedUtf8(char* utf8_out, const uint16_t* utf16_in, size_t char_count) {
while (char_count--) {
uint16_t ch = *utf16_in++;
if (ch > 0 && ch <= 0x7f) {
*utf8_out++ = ch;
} else {
if (ch > 0x07ff) {
*utf8_out++ = (ch >> 12) | 0xe0;
*utf8_out++ = ((ch >> 6) & 0x3f) | 0x80;
*utf8_out++ = (ch & 0x3f) | 0x80;
} else /*(ch > 0x7f || ch == 0)*/ {
*utf8_out++ = (ch >> 6) | 0xc0;
*utf8_out++ = (ch & 0x3f) | 0x80;
}
}
}
}
int32_t ComputeUtf16Hash(mirror::CharArray* chars, int32_t offset,
size_t char_count) {
uint32_t hash = 0;
for (size_t i = 0; i < char_count; i++) {
hash = hash * 31 + chars->Get(offset + i);
}
return static_cast<int32_t>(hash);
}
int32_t ComputeUtf16Hash(const uint16_t* chars, size_t char_count) {
uint32_t hash = 0;
while (char_count--) {
hash = hash * 31 + *chars++;
}
return static_cast<int32_t>(hash);
}
size_t ComputeModifiedUtf8Hash(const char* chars) {
size_t hash = 0;
while (*chars != '\0') {
hash = hash * 31 + *chars++;
}
return static_cast<int32_t>(hash);
}
int CompareModifiedUtf8ToUtf16AsCodePointValues(const char* utf8_1, const uint16_t* utf8_2) {
for (;;) {
if (*utf8_1 == '\0') {
return (*utf8_2 == '\0') ? 0 : -1;
} else if (*utf8_2 == '\0') {
return 1;
}
int c1 = GetUtf16FromUtf8(&utf8_1);
int c2 = *utf8_2;
if (c1 != c2) {
return c1 > c2 ? 1 : -1;
}
}
}
size_t CountUtf8Bytes(const uint16_t* chars, size_t char_count) {
size_t result = 0;
while (char_count--) {
uint16_t ch = *chars++;
if (ch > 0 && ch <= 0x7f) {
++result;
} else {
if (ch > 0x7ff) {
result += 3;
} else {
result += 2;
}
}
}
return result;
}
} // namespace art
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