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 <algorithm>
20 #include <string>
21 
22 #include "utils/ByteOrder.h"
23 #include "utils/Unicode.h"
24 
25 #ifdef _WIN32
26 #ifdef ERROR
27 #undef ERROR
28 #endif
29 #endif
30 
31 namespace android {
32 namespace util {
33 
34 void ReadUtf16StringFromDevice(const uint16_t* src, size_t len, std::string* out) {
35   char buf[5];
36   while (*src && len != 0) {
37     char16_t c = static_cast<char16_t>(dtohs(*src));
38     utf16_to_utf8(&c, 1, buf, sizeof(buf));
39     out->append(buf, strlen(buf));
40     ++src;
41     --len;
42   }
43 }
44 
45 std::u16string Utf8ToUtf16(const StringPiece& utf8) {
46   ssize_t utf16_length =
47       utf8_to_utf16_length(reinterpret_cast<const uint8_t*>(utf8.data()), utf8.length());
48   if (utf16_length <= 0) {
49     return {};
50   }
51 
52   std::u16string utf16;
53   utf16.resize(utf16_length);
54   utf8_to_utf16(reinterpret_cast<const uint8_t*>(utf8.data()), utf8.length(), &*utf16.begin(),
55                 utf16_length + 1);
56   return utf16;
57 }
58 
59 std::string Utf16ToUtf8(const StringPiece16& utf16) {
60   ssize_t utf8_length = utf16_to_utf8_length(utf16.data(), utf16.length());
61   if (utf8_length <= 0) {
62     return {};
63   }
64 
65   std::string utf8;
66   utf8.resize(utf8_length);
67   utf16_to_utf8(utf16.data(), utf16.length(), &*utf8.begin(), utf8_length + 1);
68   return utf8;
69 }
70 
71 static std::vector<std::string> SplitAndTransform(
72     const StringPiece& str, char sep, const std::function<char(char)>& f) {
73   std::vector<std::string> parts;
74   const StringPiece::const_iterator end = std::end(str);
75   StringPiece::const_iterator start = std::begin(str);
76   StringPiece::const_iterator current;
77   do {
78     current = std::find(start, end, sep);
79     parts.emplace_back(str.substr(start, current).to_string());
80     if (f) {
81       std::string& part = parts.back();
82       std::transform(part.begin(), part.end(), part.begin(), f);
83     }
84     start = current + 1;
85   } while (current != end);
86   return parts;
87 }
88 
89 std::vector<std::string> SplitAndLowercase(const StringPiece& str, char sep) {
90   return SplitAndTransform(str, sep, ::tolower);
91 }
92 
93 
94 } // namespace util
95 } // namespace android
96