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f85b94e6d4
KBufferBuilder is always allowed to expand if it wants to. This restriction was added a long time ago when it was unsafe to allocate VM while generating ProcFS contents.
112 lines
2.4 KiB
C++
112 lines
2.4 KiB
C++
/*
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* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/StdLibExtras.h>
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#include <Kernel/KBufferBuilder.h>
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namespace Kernel {
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inline bool KBufferBuilder::check_expand(size_t size)
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{
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if (!m_buffer)
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return false;
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if ((m_size + size) < m_buffer->capacity())
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return true;
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if (Checked<size_t>::addition_would_overflow(m_size, size))
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return false;
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size_t new_buffer_size = m_size + size;
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if (Checked<size_t>::addition_would_overflow(new_buffer_size, 1 * MiB))
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return false;
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new_buffer_size = page_round_up(new_buffer_size + 1 * MiB);
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return m_buffer->expand(new_buffer_size);
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}
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bool KBufferBuilder::flush()
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{
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if (!m_buffer)
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return false;
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m_buffer->set_size(m_size);
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return true;
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}
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OwnPtr<KBuffer> KBufferBuilder::build()
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{
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if (!flush())
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return {};
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return try_make<KBuffer>(move(m_buffer));
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}
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KBufferBuilder::KBufferBuilder()
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: m_buffer(KBufferImpl::try_create_with_size(4 * MiB, Region::Access::Read | Region::Access::Write))
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{
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}
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void KBufferBuilder::append_bytes(ReadonlyBytes bytes)
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{
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if (!check_expand(bytes.size()))
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return;
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memcpy(insertion_ptr(), bytes.data(), bytes.size());
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m_size += bytes.size();
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}
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void KBufferBuilder::append(const StringView& str)
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{
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if (str.is_empty())
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return;
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if (!check_expand(str.length()))
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return;
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memcpy(insertion_ptr(), str.characters_without_null_termination(), str.length());
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m_size += str.length();
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}
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void KBufferBuilder::append(const char* characters, int length)
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{
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if (!length)
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return;
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if (!check_expand(length))
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return;
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memcpy(insertion_ptr(), characters, length);
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m_size += length;
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}
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void KBufferBuilder::append(char ch)
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{
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if (!check_expand(1))
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return;
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insertion_ptr()[0] = ch;
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m_size += 1;
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}
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void KBufferBuilder::append_escaped_for_json(const StringView& string)
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{
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for (auto ch : string) {
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switch (ch) {
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case '\e':
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append("\\u001B");
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break;
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case '\b':
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append("\\b");
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break;
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case '\n':
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append("\\n");
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break;
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case '\t':
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append("\\t");
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break;
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case '\"':
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append("\\\"");
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break;
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case '\\':
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append("\\\\");
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break;
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default:
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append(ch);
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}
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}
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}
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}
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