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1 | // Tencent is pleased to support the open source community by making RapidJSON available. |
2 | // | |
3 | // Copyright (C) 2015 THL A29 Limited, a Tencent company, and Milo Yip. All rights reserved. | |
4 | // | |
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 | |
7 | // | |
8 | // http://opensource.org/licenses/MIT | |
9 | // | |
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. | |
14 | ||
15 | #ifndef RAPIDJSON_FILEWRITESTREAM_H_ | |
16 | #define RAPIDJSON_FILEWRITESTREAM_H_ | |
17 | ||
18 | #include "stream.h" | |
19 | #include <cstdio> | |
20 | ||
21 | #ifdef __clang__ | |
22 | RAPIDJSON_DIAG_PUSH | |
23 | RAPIDJSON_DIAG_OFF(unreachable-code) | |
24 | #endif | |
25 | ||
26 | RAPIDJSON_NAMESPACE_BEGIN | |
27 | ||
28 | //! Wrapper of C file stream for input using fread(). | |
29 | /*! | |
30 | \note implements Stream concept | |
31 | */ | |
32 | class FileWriteStream { | |
33 | public: | |
34 | typedef char Ch; //!< Character type. Only support char. | |
35 | ||
36 | FileWriteStream(std::FILE* fp, char* buffer, size_t bufferSize) : fp_(fp), buffer_(buffer), bufferEnd_(buffer + bufferSize), current_(buffer_) { | |
37 | RAPIDJSON_ASSERT(fp_ != 0); | |
38 | } | |
39 | ||
40 | void Put(char c) { | |
41 | if (current_ >= bufferEnd_) | |
42 | Flush(); | |
43 | ||
44 | *current_++ = c; | |
45 | } | |
46 | ||
47 | void PutN(char c, size_t n) { | |
48 | size_t avail = static_cast<size_t>(bufferEnd_ - current_); | |
49 | while (n > avail) { | |
50 | std::memset(current_, c, avail); | |
51 | current_ += avail; | |
52 | Flush(); | |
53 | n -= avail; | |
54 | avail = static_cast<size_t>(bufferEnd_ - current_); | |
55 | } | |
56 | ||
57 | if (n > 0) { | |
58 | std::memset(current_, c, n); | |
59 | current_ += n; | |
60 | } | |
61 | } | |
62 | ||
63 | void Flush() { | |
64 | if (current_ != buffer_) { | |
65 | size_t result = 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 | |
69 | } | |
70 | current_ = buffer_; | |
71 | } | |
72 | } | |
73 | ||
74 | // Not implemented | |
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; } | |
80 | ||
81 | private: | |
82 | // Prohibit copy constructor & assignment operator. | |
83 | FileWriteStream(const FileWriteStream&); | |
84 | FileWriteStream& operator=(const FileWriteStream&); | |
85 | ||
86 | std::FILE* fp_; | |
87 | char *buffer_; | |
88 | char *bufferEnd_; | |
89 | char *current_; | |
90 | }; | |
91 | ||
92 | //! Implement specialized version of PutN() with memset() for better performance. | |
93 | template<> | |
94 | inline void PutN(FileWriteStream& stream, char c, size_t n) { | |
95 | stream.PutN(c, n); | |
96 | } | |
97 | ||
98 | RAPIDJSON_NAMESPACE_END | |
99 | ||
100 | #ifdef __clang__ | |
101 | RAPIDJSON_DIAG_POP | |
102 | #endif | |
103 | ||
104 | #endif // RAPIDJSON_FILESTREAM_H_ |