1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
|
/*
* Copyright 2017 The Native Object Protocols Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef LIBNOP_INLCUDE_NOP_UTILITY_STREAM_WRITER_H_
#define LIBNOP_INLCUDE_NOP_UTILITY_STREAM_WRITER_H_
#include <cstdint>
#include <ostream>
#include <nop/status.h>
namespace nop {
//
// Writer template type that wraps STL output streams.
//
// Implements the basic writer interface on top of an STL output stream type.
//
template <typename OStream>
class StreamWriter {
public:
template <typename... Args>
StreamWriter(Args&&... args) : stream_{std::forward<Args>(args)...} {}
StreamWriter(const StreamWriter&) = default;
StreamWriter& operator=(const StreamWriter&) = default;
Status<void> Prepare(std::size_t /*size*/) { return {}; }
Status<void> Write(std::uint8_t byte) {
stream_.put(static_cast<typename OStream::char_type>(byte));
return ReturnStatus();
}
Status<void> Write(const void* begin, const void* end) {
using CharType = typename OStream::char_type;
const CharType* begin_char = static_cast<const CharType*>(begin);
const CharType* end_char = static_cast<const CharType*>(end);
const std::size_t length_bytes = std::distance(begin_char, end_char);
stream_.write(begin_char, length_bytes);
return ReturnStatus();
}
Status<void> Skip(std::size_t padding_bytes,
std::uint8_t padding_value = 0x00) {
for (std::size_t i = 0; i < padding_bytes; i++) {
stream_.put(padding_value);
auto status = ReturnStatus();
if (!status)
return status;
}
return {};
}
const OStream& stream() const { return stream_; }
OStream& stream() { return stream_; }
OStream&& take() { return std::move(stream_); }
private:
Status<void> ReturnStatus() {
if (stream_.bad() || stream_.eof())
return ErrorStatus::StreamError;
else
return {};
}
OStream stream_;
};
} // namespace nop
#endif // LIBNOP_INLCUDE_NOP_UTILITY_STREAM_WRITER_H_
|
