mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-11-29 19:10:26 +00:00
3f3f45580a
Each of these strings would previously rely on StringView's char const* constructor overload, which would call __builtin_strlen on the string. Since we now have operator ""sv, we can replace these with much simpler versions. This opens the door to being able to remove StringView(char const*). No functional changes.
132 lines
3.2 KiB
C++
132 lines
3.2 KiB
C++
/*
|
|
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include <AK/StdLibExtras.h>
|
|
#include <Kernel/KBufferBuilder.h>
|
|
|
|
namespace Kernel {
|
|
|
|
inline bool KBufferBuilder::check_expand(size_t size)
|
|
{
|
|
if (!m_buffer)
|
|
return false;
|
|
if ((m_size + size) < m_buffer->capacity())
|
|
return true;
|
|
if (Checked<size_t>::addition_would_overflow(m_size, size))
|
|
return false;
|
|
size_t new_buffer_size = m_size + size;
|
|
if (Checked<size_t>::addition_would_overflow(new_buffer_size, 1 * MiB))
|
|
return false;
|
|
auto rounded_new_buffer_size_or_error = Memory::page_round_up(new_buffer_size + 1 * MiB);
|
|
if (rounded_new_buffer_size_or_error.is_error()) {
|
|
return false;
|
|
}
|
|
auto new_buffer_or_error = KBuffer::try_create_with_size("KBufferBuilder"sv, rounded_new_buffer_size_or_error.value());
|
|
if (new_buffer_or_error.is_error())
|
|
return false;
|
|
auto new_buffer = new_buffer_or_error.release_value();
|
|
memcpy(new_buffer->data(), m_buffer->data(), m_buffer->size());
|
|
m_buffer = move(new_buffer);
|
|
return true;
|
|
}
|
|
|
|
bool KBufferBuilder::flush()
|
|
{
|
|
if (!m_buffer)
|
|
return false;
|
|
m_buffer->set_size(m_size);
|
|
return true;
|
|
}
|
|
|
|
OwnPtr<KBuffer> KBufferBuilder::build()
|
|
{
|
|
if (!flush())
|
|
return {};
|
|
|
|
return move(m_buffer);
|
|
}
|
|
|
|
ErrorOr<KBufferBuilder> KBufferBuilder::try_create()
|
|
{
|
|
auto buffer = TRY(KBuffer::try_create_with_size("KBufferBuilder"sv, 4 * MiB, Memory::Region::Access::ReadWrite));
|
|
return KBufferBuilder { move(buffer) };
|
|
}
|
|
|
|
KBufferBuilder::KBufferBuilder(NonnullOwnPtr<KBuffer> buffer)
|
|
: m_buffer(move(buffer))
|
|
{
|
|
}
|
|
|
|
ErrorOr<void> KBufferBuilder::append_bytes(ReadonlyBytes bytes)
|
|
{
|
|
if (!check_expand(bytes.size()))
|
|
return ENOMEM;
|
|
memcpy(insertion_ptr(), bytes.data(), bytes.size());
|
|
m_size += bytes.size();
|
|
return {};
|
|
}
|
|
|
|
ErrorOr<void> KBufferBuilder::append(StringView str)
|
|
{
|
|
if (str.is_empty())
|
|
return {};
|
|
if (!check_expand(str.length()))
|
|
return ENOMEM;
|
|
memcpy(insertion_ptr(), str.characters_without_null_termination(), str.length());
|
|
m_size += str.length();
|
|
return {};
|
|
}
|
|
|
|
ErrorOr<void> KBufferBuilder::append(char const* characters, int length)
|
|
{
|
|
if (!length)
|
|
return {};
|
|
if (!check_expand(length))
|
|
return ENOMEM;
|
|
memcpy(insertion_ptr(), characters, length);
|
|
m_size += length;
|
|
return {};
|
|
}
|
|
|
|
ErrorOr<void> KBufferBuilder::append(char ch)
|
|
{
|
|
if (!check_expand(1))
|
|
return ENOMEM;
|
|
insertion_ptr()[0] = ch;
|
|
m_size += 1;
|
|
return {};
|
|
}
|
|
|
|
ErrorOr<void> KBufferBuilder::append_escaped_for_json(StringView string)
|
|
{
|
|
for (auto ch : string) {
|
|
switch (ch) {
|
|
case '\b':
|
|
TRY(append("\\b"sv));
|
|
break;
|
|
case '\n':
|
|
TRY(append("\\n"sv));
|
|
break;
|
|
case '\t':
|
|
TRY(append("\\t"sv));
|
|
break;
|
|
case '\"':
|
|
TRY(append("\\\""sv));
|
|
break;
|
|
case '\\':
|
|
TRY(append("\\\\"sv));
|
|
break;
|
|
default:
|
|
if (ch >= 0 && ch <= 0x1f)
|
|
TRY(appendff("\\u{:04x}", ch));
|
|
else
|
|
TRY(append(ch));
|
|
}
|
|
}
|
|
return {};
|
|
}
|
|
|
|
}
|