1 /*
2  * Copyright (c) 2024-2024 Huawei Device Co., Ltd.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at
6  *
7  *     http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 
16 #ifndef SIGNATRUETOOLS_RANDOM_ACCESS_FILE_H
17 #define SIGNATRUETOOLS_RANDOM_ACCESS_FILE_H
18 
19 #include <cerrno>
20 #include <fcntl.h>
21 #include <sys/mman.h>
22 #include <sys/stat.h>
23 #include <unistd.h>
24 #include <string>
25 #include <cstring>
26 #include <fstream>
27 
28 #include "export_define.h"
29 #include "byte_buffer.h"
30 #include "digest_parameter.h"
31 
32 namespace OHOS {
33 namespace SignatureTools {
34 
35 struct MmapInfo {
36     int64_t mmapPosition;
37     int32_t readMoreLen = 0;
38     int32_t mmapSize = 0;
39     char* mapAddr;
40 };
41 
42 class RandomAccessFile {
43 public:
44     DLL_EXPORT RandomAccessFile();
45     DLL_EXPORT ~RandomAccessFile();
46     DLL_EXPORT bool Init(const std::string& filePath);
47     DLL_EXPORT int64_t GetLength() const;
48     DLL_EXPORT int32_t ReadFileFullyFromOffset(ByteBuffer& buffer, int64_t offset);
49     DLL_EXPORT int32_t ReadFileFullyFromOffset(char buf[], int64_t offset, int64_t bufCapacity);
50     DLL_EXPORT int32_t WriteToFile(ByteBuffer& buffer, int64_t position, int64_t length);
51     DLL_EXPORT bool ReadFileFromOffsetAndDigestUpdate(const DigestParameter& digestParam, int32_t chunkSize,
52                                                       int64_t offset);
53 
54 private:
55     int32_t DoMMap(int32_t bufCapacity, int64_t offset, MmapInfo& mmapInfo);
56     bool CheckLittleEndian();
57     static int32_t memoryPageSize;
58     int32_t fd = 0;
59     int64_t fileLength;
60 };
61 } // namespace SignatureTools
62 } // namespace OHOS
63 #endif // SIGNATRUETOOLS_RANDOM_ACCESS_FILE_H
64