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filereadstream.h
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3 // Copyright (C) 2015 THL A29 Limited, a Tencent company, and Milo Yip. All rights reserved.
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5 // Licensed under the MIT License (the "License"); you may not use this file except
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7 //
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14 
15 #ifndef RAPIDJSON_FILEREADSTREAM_H_
16 #define RAPIDJSON_FILEREADSTREAM_H_
17 
18 #include "stream.h"
19 #include <cstdio>
20 
21 #ifdef __clang__
22 RAPIDJSON_DIAG_PUSH
23 RAPIDJSON_DIAG_OFF(padded)
24 RAPIDJSON_DIAG_OFF(unreachable-code)
25 RAPIDJSON_DIAG_OFF(missing-noreturn)
26 #endif
27 
29 
31 
35 public:
36  typedef char Ch;
37 
39 
44  FileReadStream(std::FILE* fp, char* buffer, size_t bufferSize) : fp_(fp), buffer_(buffer), bufferSize_(bufferSize), bufferLast_(0), current_(buffer_), readCount_(0), count_(0), eof_(false) {
45  RAPIDJSON_ASSERT(fp_ != 0);
46  RAPIDJSON_ASSERT(bufferSize >= 4);
47  Read();
48  }
49 
50  Ch Peek() const { return *current_; }
51  Ch Take() { Ch c = *current_; Read(); return c; }
52  size_t Tell() const { return count_ + static_cast<size_t>(current_ - buffer_); }
53 
54  // Not implemented
55  void Put(Ch) { RAPIDJSON_ASSERT(false); }
56  void Flush() { RAPIDJSON_ASSERT(false); }
57  Ch* PutBegin() { RAPIDJSON_ASSERT(false); return 0; }
58  size_t PutEnd(Ch*) { RAPIDJSON_ASSERT(false); return 0; }
59 
60  // For encoding detection only.
61  const Ch* Peek4() const {
62  return (current_ + 4 <= bufferLast_) ? current_ : 0;
63  }
64 
65 private:
66  void Read() {
67  if (current_ < bufferLast_)
68  ++current_;
69  else if (!eof_) {
70  count_ += readCount_;
73  current_ = buffer_;
74 
75  if (readCount_ < bufferSize_) {
76  buffer_[readCount_] = '\0';
77  ++bufferLast_;
78  eof_ = true;
79  }
80  }
81  }
82 
85  size_t bufferSize_;
88  size_t readCount_;
89  size_t count_;
90  bool eof_;
91 };
92 
94 
95 #ifdef __clang__
96 RAPIDJSON_DIAG_POP
97 #endif
98 
99 #endif // RAPIDJSON_FILESTREAM_H_
Ch Peek() const
Definition: filereadstream.h:50
void Flush()
Definition: filereadstream.h:56
size_t Tell() const
Definition: filereadstream.h:52
size_t count_
Number of characters read.
Definition: filereadstream.h:89
void Read()
Definition: filereadstream.h:66
char Ch
Character type (byte).
Definition: filereadstream.h:36
File byte stream for input using fread().
Definition: filereadstream.h:34
size_t bufferSize_
Definition: filereadstream.h:85
size_t readCount_
Definition: filereadstream.h:88
void Put(Ch)
Definition: filereadstream.h:55
bool eof_
Definition: filereadstream.h:90
#define RAPIDJSON_NAMESPACE_END
provide custom rapidjson namespace (closing expression)
Definition: rapidjson.h:119
const GLubyte * c
Definition: glext.h:9812
std::FILE * fp_
Definition: filereadstream.h:83
Ch * buffer_
Definition: filereadstream.h:84
#define RAPIDJSON_ASSERT(x)
Assertion.
Definition: rapidjson.h:402
size_t PutEnd(Ch *)
Definition: filereadstream.h:58
Definition: inftrees.h:27
Ch * current_
Definition: filereadstream.h:87
const Ch * Peek4() const
Definition: filereadstream.h:61
#define FILE
Definition: file_stream_transforms.h:35
Ch * bufferLast_
Definition: filereadstream.h:86
#define RAPIDJSON_NAMESPACE_BEGIN
provide custom rapidjson namespace (opening expression)
Definition: rapidjson.h:116
Ch * PutBegin()
Definition: filereadstream.h:57
#define fread
Definition: file_stream_transforms.h:56
Ch Take()
Definition: filereadstream.h:51
FileReadStream(std::FILE *fp, char *buffer, size_t bufferSize)
Constructor.
Definition: filereadstream.h:44
#define false
Definition: ordinals.h:83
Definition: video4linux2.c:51