1 /*
2 * Copyright (C) 2023 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 #pragma once
17
18 #include <android/persistable_bundle.h>
19 #include <log/log.h>
20 #include <utils/String8.h>
21
22 // take a vector and put the contents into a buffer.
23 // return the size of the contents.
24 // This may not put all of the contents into the buffer if the buffer is not
25 // large enough.
26 template <typename T>
getVecInternal(const std::vector<T> & inVec,T * _Nullable buffer,int32_t bufferSizeBytes)27 int32_t getVecInternal(const std::vector<T>& inVec, T* _Nullable buffer, int32_t bufferSizeBytes) {
28 LOG_ALWAYS_FATAL_IF(inVec.size() > INT32_MAX,
29 "The size of the APersistableBundle has gotten too large!");
30 LOG_ALWAYS_FATAL_IF(
31 bufferSizeBytes < 0,
32 "The buffer size in bytes can not be larger than INT32_MAX and can not be negative.");
33 int32_t num = inVec.size();
34 int32_t numAvailable = bufferSizeBytes / sizeof(T);
35 int32_t numFill = numAvailable < num ? numAvailable : num;
36
37 if (numFill > 0 && buffer) {
38 for (int32_t i = 0; i < numFill; i++) {
39 buffer[i] = inVec[i];
40 }
41 }
42 return num * sizeof(T);
43 }
44
45 // take a vector or a set of String16 and put the contents into a char** buffer.
46 // return the size of the contents.
47 // This may not put all of the contents into the buffer if the buffer is not
48 // large enough.
49 // The strings are duped with a user supplied callback
50 template <typename T>
getStringsInternal(const T & strings,char * _Nullable * _Nullable buffer,int32_t bufferSizeBytes,APersistableBundle_stringAllocator stringAllocator,void * _Nullable context)51 int32_t getStringsInternal(const T& strings, char* _Nullable* _Nullable buffer,
52 int32_t bufferSizeBytes,
53 APersistableBundle_stringAllocator stringAllocator,
54 void* _Nullable context) {
55 LOG_ALWAYS_FATAL_IF(strings.size() > INT32_MAX,
56 "The size of the APersistableBundle has gotten too large!");
57 LOG_ALWAYS_FATAL_IF(
58 bufferSizeBytes < 0,
59 "The buffer size in bytes can not be larger than INT32_MAX and can not be negative.");
60 int32_t num = strings.size();
61 int32_t numAvailable = bufferSizeBytes / sizeof(char*);
62 int32_t numFill = numAvailable < num ? numAvailable : num;
63 if (!stringAllocator) {
64 return APERSISTABLEBUNDLE_ALLOCATOR_FAILED;
65 }
66
67 if (numFill > 0 && buffer) {
68 int32_t i = 0;
69 for (const auto& val : strings) {
70 android::String8 tmp8 = android::String8(val);
71 buffer[i] = stringAllocator(tmp8.bytes() + 1, context);
72 if (buffer[i] == nullptr) {
73 return APERSISTABLEBUNDLE_ALLOCATOR_FAILED;
74 }
75 strncpy(buffer[i], tmp8.c_str(), tmp8.bytes() + 1);
76 i++;
77 if (i > numFill - 1) {
78 // buffer is too small to keep going or this is the end of the
79 // set
80 break;
81 }
82 }
83 }
84 return num * sizeof(char*);
85 }
86