/* * 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(const mirror::CharArray* chars, int32_t offset, size_t char_count) { int32_t hash = 0; for (size_t i = 0; i < char_count; i++) { hash = hash * 31 + chars->Get(offset + i); } return hash; } int32_t ComputeUtf16Hash(const uint16_t* chars, size_t char_count) { int32_t hash = 0; while (char_count--) { hash = hash * 31 + *chars++; } return 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