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