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InputStream.h
1 /*
2  * This library is free software; you can redistribute it and/or
3  * modify it under the terms of the GNU Lesser General Public
4  * License as published by the Free Software Foundation; either
5  * version 2.1 of the License, or (at your option) any later version.
6  *
7  * This library is distributed in the hope that it will be useful,
8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
10  * Lesser General Public License for more details.
11  *
12  * You should have received a copy of the GNU Lesser General Public
13  * License along with this library; if not, write to the Free Software
14  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
15  *
16  * InputStream.h
17  * A interface & class to extract formatted data.
18  * Copyright (C) 2012 Simon Newton
19  */
20 
21 #ifndef INCLUDE_OLA_IO_INPUTSTREAM_H_
22 #define INCLUDE_OLA_IO_INPUTSTREAM_H_
23 
24 #include <stdint.h>
25 #include <ola/io/InputBuffer.h>
26 #include <string>
27 
28 namespace ola {
29 namespace io {
30 
35  public:
36  virtual ~InputStreamInterface() {}
37 
38  /*
39  * Extract data from the Stream.
40  * Returns false if there was insufficient data to extract.
41  */
42  virtual bool operator>>(int8_t &val) = 0;
43  virtual bool operator>>(uint8_t &val) = 0;
44  virtual bool operator>>(int16_t &val) = 0;
45  virtual bool operator>>(uint16_t &val) = 0;
46  virtual bool operator>>(int32_t &val) = 0;
47  virtual bool operator>>(uint32_t &val) = 0;
48 
49  /*
50  * Append up to size bytes of data to the string.
51  * @returns the number of bytes read
52  */
53  virtual unsigned int ReadString(std::string *output, unsigned int size) = 0;
54 };
55 
56 
62  public:
63  // Ownership of the InputBuffer is not transferred.
64  explicit InputStream(InputBufferInterface *buffer)
65  : m_buffer(buffer) {
66  }
67  virtual ~InputStream() {}
68 
69  bool operator>>(int8_t &val) { return Extract(&val); }
70  bool operator>>(uint8_t &val) { return Extract(&val); }
71  bool operator>>(int16_t &val) { return Extract(&val); }
72  bool operator>>(uint16_t &val) { return Extract(&val); }
73  bool operator>>(int32_t &val) { return Extract(&val); }
74  bool operator>>(uint32_t &val) { return Extract(&val); }
75 
76  unsigned int ReadString(std::string *output, unsigned int size) {
77  return m_buffer->Read(output, size);
78  }
79 
80  private:
81  InputBufferInterface *m_buffer;
82 
83  template <typename T>
84  bool Extract(T *val) {
85  unsigned int length = m_buffer->Read(reinterpret_cast<uint8_t*>(val),
86  sizeof(*val));
87  return length == sizeof(*val);
88  }
89 
90  InputStream(const InputStream&);
91  InputStream& operator=(const InputStream&);
92 };
93 } // namespace io
94 } // namespace ola
95 #endif // INCLUDE_OLA_IO_INPUTSTREAM_H_