Util.cpp revision d1ecd7af687bcad0f87c37fe33515ff6c5ea0f1d 
1/*
2 * Copyright (C) 2016 The Android Open Source Project
3 *
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
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
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.
15 */
16
17#include "androidfw/Util.h"
18
19#include <string>
20
21#include "utils/ByteOrder.h"
22#include "utils/Unicode.h"
23
24#ifdef _WIN32
25#ifdef ERROR
26#undef ERROR
27#endif
28#endif
29
30namespace android {
31namespace util {
32
33void ReadUtf16StringFromDevice(const uint16_t* src, size_t len, std::string* out) {
34  char buf[5];
35  while (*src && len != 0) {
36    char16_t c = static_cast<char16_t>(dtohs(*src));
37    utf16_to_utf8(&c, 1, buf, sizeof(buf));
38    out->append(buf, strlen(buf));
39    ++src;
40    --len;
41  }
42}
43
44std::u16string Utf8ToUtf16(const StringPiece& utf8) {
45  ssize_t utf16_length =
46      utf8_to_utf16_length(reinterpret_cast<const uint8_t*>(utf8.data()), utf8.length());
47  if (utf16_length <= 0) {
48    return {};
49  }
50
51  std::u16string utf16;
52  utf16.resize(utf16_length);
53  utf8_to_utf16(reinterpret_cast<const uint8_t*>(utf8.data()), utf8.length(), &*utf16.begin(),
54                utf16_length + 1);
55  return utf16;
56}
57
58std::string Utf16ToUtf8(const StringPiece16& utf16) {
59  ssize_t utf8_length = utf16_to_utf8_length(utf16.data(), utf16.length());
60  if (utf8_length <= 0) {
61    return {};
62  }
63
64  std::string utf8;
65  utf8.resize(utf8_length);
66  utf16_to_utf8(utf16.data(), utf16.length(), &*utf8.begin(), utf8_length + 1);
67  return utf8;
68}
69
70} // namespace util
71} // namespace android
72