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BigEndianStream.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  * BigEndianStream.h
17  * Wraps another {Input,Output}StreamInterface object and converts from Big
18  * Endian to host order.
19  * Copyright (C) 2012 Simon Newton
20  */
21 
22 #ifndef INCLUDE_OLA_IO_BIGENDIANSTREAM_H_
23 #define INCLUDE_OLA_IO_BIGENDIANSTREAM_H_
24 
25 #include <ola/io/InputStream.h>
26 #include <ola/io/OutputStream.h>
27 #include <ola/network/NetworkUtils.h>
28 #include <string>
29 
30 namespace ola {
31 namespace io {
32 
33 // An abstract class that guarantees byte order will be converted.
35 
42  public:
43  // Ownership of the stream is not transferred.
45  : m_stream(stream) {
46  }
48 
49  bool operator>>(int8_t &val) { return ExtractAndConvert(&val); }
50  bool operator>>(uint8_t &val) { return ExtractAndConvert(&val); }
51  bool operator>>(int16_t &val) { return ExtractAndConvert(&val); }
52  bool operator>>(uint16_t &val) { return ExtractAndConvert(&val); }
53  bool operator>>(int32_t &val) { return ExtractAndConvert(&val); }
54  bool operator>>(uint32_t &val) { return ExtractAndConvert(&val); }
55 
56  unsigned int ReadString(std::string *output, unsigned int size) {
57  return m_stream->ReadString(output, size);
58  }
59 
60  private:
61  InputStreamInterface *m_stream;
62 
63  template <typename T>
64  bool ExtractAndConvert(T *val) {
65  bool ok = (*m_stream) >> *val;
66  *val = ola::network::NetworkToHost(*val);
67  return ok;
68  }
69 
72 };
73 
74 
79  public:
80  // Ownership of the InputBuffer is not transferred.
82  : m_input_stream(buffer),
83  m_adaptor(&m_input_stream) {
84  }
86 
87  bool operator>>(int8_t &val) { return m_adaptor >> val; }
88  bool operator>>(uint8_t &val) { return m_adaptor >> val; }
89  bool operator>>(int16_t &val) { return m_adaptor >> val; }
90  bool operator>>(uint16_t &val) { return m_adaptor >> val; }
91  bool operator>>(int32_t &val) { return m_adaptor >> val; }
92  bool operator>>(uint32_t &val) { return m_adaptor >> val; }
93 
94  unsigned int ReadString(std::string *output, unsigned int size) {
95  return m_adaptor.ReadString(output, size);
96  }
97 
98  private:
99  InputStream m_input_stream;
100  BigEndianInputStreamAdaptor m_adaptor;
101 
103  BigEndianInputStream& operator=(const BigEndianInputStream&);
104 };
105 
106 
107 // An abstract class that guarantees byte order will be converted.
109 
116  public:
117  // Ownership of the stream is not transferred.
119  : m_stream(stream) {
120  }
122 
123  void Write(const uint8_t *data, unsigned int length) {
124  m_stream->Write(data, length);
125  }
126 
127  BigEndianOutputStreamAdaptor& operator<<(int8_t val) {
128  return ConvertAndWrite(val);
129  }
130 
131  BigEndianOutputStreamAdaptor& operator<<(uint8_t val) {
132  return ConvertAndWrite(val);
133  }
134 
135  BigEndianOutputStreamAdaptor& operator<<(int16_t val) {
136  return ConvertAndWrite(val);
137  }
138 
139  BigEndianOutputStreamAdaptor& operator<<(uint16_t val) {
140  return ConvertAndWrite(val);
141  }
142 
143  BigEndianOutputStreamAdaptor& operator<<(int32_t val) {
144  return ConvertAndWrite(val);
145  }
146 
147  BigEndianOutputStreamAdaptor& operator<<(uint32_t val) {
148  return ConvertAndWrite(val);
149  }
150 
151  private:
152  OutputStreamInterface *m_stream;
153 
154  template <typename T>
155  BigEndianOutputStreamAdaptor& ConvertAndWrite(const T &val) {
156  (*m_stream) << ola::network::HostToNetwork(val);
157  return *this;
158  }
159 
161  BigEndianOutputStreamAdaptor& operator=(
163 };
164 
165 
170  public:
171  // Ownership of the OutputBuffer is not transferred.
173  : m_output_stream(buffer),
174  m_adaptor(&m_output_stream) {
175  }
177 
178  void Write(const uint8_t *data, unsigned int length) {
179  m_adaptor.Write(data, length);
180  }
181 
182  BigEndianOutputStream& operator<<(int8_t val) { return Output(val); }
183  BigEndianOutputStream& operator<<(uint8_t val) { return Output(val); }
184  BigEndianOutputStream& operator<<(int16_t val) { return Output(val); }
185  BigEndianOutputStream& operator<<(uint16_t val) { return Output(val); }
186  BigEndianOutputStream& operator<<(int32_t val) { return Output(val); }
187  BigEndianOutputStream& operator<<(uint32_t val) { return Output(val); }
188 
189  private:
190  OutputStream m_output_stream;
192 
193  template <typename T>
194  BigEndianOutputStream& Output(T val) {
195  m_adaptor << val;
196  return *this;
197  }
198 
200  BigEndianOutputStream& operator=(const BigEndianOutputStream&);
201 };
202 } // namespace io
203 } // namespace ola
204 #endif // INCLUDE_OLA_IO_BIGENDIANSTREAM_H_