blob: 5de5c4d7fcd259c82c6bfad0207c1fc5f89787f9 (
plain)
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
|
/*
* Copyright (c) 2021, Ali Mohammad Pur <mpfard@serenityos.org>
* Copyright (c) 2023, Tim Schumacher <timschumi@gmx.de>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/ConstrainedStream.h>
namespace AK {
ConstrainedStream::ConstrainedStream(MaybeOwned<Stream> stream, u64 limit)
: m_stream(move(stream))
, m_limit(limit)
{
}
ErrorOr<Bytes> ConstrainedStream::read_some(Bytes bytes)
{
if (bytes.size() >= m_limit)
bytes = bytes.trim(m_limit);
auto result = TRY(m_stream->read_some(bytes));
m_limit -= result.size();
return result;
}
ErrorOr<void> ConstrainedStream::discard(size_t discarded_bytes)
{
if (discarded_bytes >= m_limit)
return Error::from_string_literal("Trying to discard more bytes than allowed");
// Note: This will remove more bytes from the limit than intended if a failing discard yields partial results.
// However, stopping early is most likely better than running over the end of the stream.
m_limit -= discarded_bytes;
TRY(m_stream->discard(discarded_bytes));
return {};
}
ErrorOr<size_t> ConstrainedStream::write_some(ReadonlyBytes)
{
return Error::from_errno(EBADF);
}
bool ConstrainedStream::is_eof() const
{
return m_limit == 0 || m_stream->is_eof();
}
bool ConstrainedStream::is_open() const
{
return m_stream->is_open();
}
void ConstrainedStream::close()
{
}
}
|
