1 // Tencent is pleased to support the open source community by making RapidJSON available.
3 // Copyright (C) 2015 THL A29 Limited, a Tencent company, and Milo Yip.
5 // Licensed under the MIT License (the "License"); you may not use this file except
6 // in compliance with the License. You may obtain a copy of the License at
8 // http://opensource.org/licenses/MIT
10 // Unless required by applicable law or agreed to in writing, software distributed
11 // under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
12 // CONDITIONS OF ANY KIND, either express or implied. See the License for the
13 // specific language governing permissions and limitations under the License.
15 #ifndef RAPIDJSON_FILEWRITESTREAM_H_
16 #define RAPIDJSON_FILEWRITESTREAM_H_
23 RAPIDJSON_DIAG_OFF(unreachable
-code
)
26 RAPIDJSON_NAMESPACE_BEGIN
28 //! Wrapper of C file stream for output using fwrite().
30 \note implements Stream concept
32 class FileWriteStream
{
34 typedef char Ch
; //!< Character type. Only support char.
36 FileWriteStream(std::FILE* fp
, char* buffer
, size_t bufferSize
) : fp_(fp
), buffer_(buffer
), bufferEnd_(buffer
+ bufferSize
), current_(buffer_
) {
37 RAPIDJSON_ASSERT(fp_
!= 0);
41 if (current_
>= bufferEnd_
)
47 void PutN(char c
, size_t n
) {
48 size_t avail
= static_cast<size_t>(bufferEnd_
- current_
);
50 std::memset(current_
, c
, avail
);
54 avail
= static_cast<size_t>(bufferEnd_
- current_
);
58 std::memset(current_
, c
, n
);
64 if (current_
!= buffer_
) {
65 size_t result
= std::fwrite(buffer_
, 1, static_cast<size_t>(current_
- buffer_
), fp_
);
66 if (result
< static_cast<size_t>(current_
- buffer_
)) {
67 // failure deliberately ignored at this time
68 // added to avoid warn_unused_result build errors
75 char Peek() const { RAPIDJSON_ASSERT(false); return 0; }
76 char Take() { RAPIDJSON_ASSERT(false); return 0; }
77 size_t Tell() const { RAPIDJSON_ASSERT(false); return 0; }
78 char* PutBegin() { RAPIDJSON_ASSERT(false); return 0; }
79 size_t PutEnd(char*) { RAPIDJSON_ASSERT(false); return 0; }
82 // Prohibit copy constructor & assignment operator.
83 FileWriteStream(const FileWriteStream
&);
84 FileWriteStream
& operator=(const FileWriteStream
&);
92 //! Implement specialized version of PutN() with memset() for better performance.
94 inline void PutN(FileWriteStream
& stream
, char c
, size_t n
) {
98 RAPIDJSON_NAMESPACE_END
104 #endif // RAPIDJSON_FILESTREAM_H_