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65b420f996
These instances were detected by searching for files that include AK/Memory.h, but don't match the regex: \\b(fast_u32_copy|fast_u32_fill|secure_zero|timing_safe_compare)\\b This regex is pessimistic, so there might be more files that don't actually use any memory function. In theory, one might use LibCPP to detect things like this automatically, but let's do this one step after another.
149 lines
3.8 KiB
C++
149 lines
3.8 KiB
C++
/*
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* Copyright (c) 2018-2020, 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/CharacterTypes.h>
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#include <AK/FlyString.h>
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#include <AK/HashTable.h>
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#include <AK/StringHash.h>
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#include <AK/StringImpl.h>
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#include <AK/kmalloc.h>
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namespace AK {
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static StringImpl* s_the_empty_stringimpl = nullptr;
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StringImpl& StringImpl::the_empty_stringimpl()
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{
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if (!s_the_empty_stringimpl) {
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void* slot = kmalloc(sizeof(StringImpl) + sizeof(char));
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s_the_empty_stringimpl = new (slot) StringImpl(ConstructTheEmptyStringImpl);
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}
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return *s_the_empty_stringimpl;
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}
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StringImpl::StringImpl(ConstructWithInlineBufferTag, size_t length)
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: m_length(length)
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{
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}
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StringImpl::~StringImpl()
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{
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if (m_fly)
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FlyString::did_destroy_impl({}, *this);
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}
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NonnullRefPtr<StringImpl> StringImpl::create_uninitialized(size_t length, char*& buffer)
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{
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VERIFY(length);
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void* slot = kmalloc(allocation_size_for_stringimpl(length));
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VERIFY(slot);
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auto new_stringimpl = adopt_ref(*new (slot) StringImpl(ConstructWithInlineBuffer, length));
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buffer = const_cast<char*>(new_stringimpl->characters());
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buffer[length] = '\0';
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return new_stringimpl;
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}
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RefPtr<StringImpl> StringImpl::create(char const* cstring, size_t length, ShouldChomp should_chomp)
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{
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if (!cstring)
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return nullptr;
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if (should_chomp) {
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while (length) {
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char last_ch = cstring[length - 1];
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if (!last_ch || last_ch == '\n' || last_ch == '\r')
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--length;
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else
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break;
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}
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}
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if (!length)
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return the_empty_stringimpl();
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char* buffer;
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auto new_stringimpl = create_uninitialized(length, buffer);
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memcpy(buffer, cstring, length * sizeof(char));
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return new_stringimpl;
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}
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RefPtr<StringImpl> StringImpl::create(char const* cstring, ShouldChomp shouldChomp)
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{
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if (!cstring)
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return nullptr;
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if (!*cstring)
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return the_empty_stringimpl();
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return create(cstring, strlen(cstring), shouldChomp);
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}
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RefPtr<StringImpl> StringImpl::create(ReadonlyBytes bytes, ShouldChomp shouldChomp)
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{
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return StringImpl::create(reinterpret_cast<char const*>(bytes.data()), bytes.size(), shouldChomp);
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}
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RefPtr<StringImpl> StringImpl::create_lowercased(char const* cstring, size_t length)
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{
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if (!cstring)
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return nullptr;
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if (!length)
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return the_empty_stringimpl();
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char* buffer;
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auto impl = create_uninitialized(length, buffer);
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for (size_t i = 0; i < length; ++i)
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buffer[i] = (char)to_ascii_lowercase(cstring[i]);
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return impl;
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}
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RefPtr<StringImpl> StringImpl::create_uppercased(char const* cstring, size_t length)
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{
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if (!cstring)
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return nullptr;
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if (!length)
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return the_empty_stringimpl();
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char* buffer;
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auto impl = create_uninitialized(length, buffer);
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for (size_t i = 0; i < length; ++i)
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buffer[i] = (char)to_ascii_uppercase(cstring[i]);
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return impl;
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}
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NonnullRefPtr<StringImpl> StringImpl::to_lowercase() const
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{
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for (size_t i = 0; i < m_length; ++i) {
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if (is_ascii_upper_alpha(characters()[i]))
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return create_lowercased(characters(), m_length).release_nonnull();
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}
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return const_cast<StringImpl&>(*this);
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}
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NonnullRefPtr<StringImpl> StringImpl::to_uppercase() const
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{
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for (size_t i = 0; i < m_length; ++i) {
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if (is_ascii_lower_alpha(characters()[i]))
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return create_uppercased(characters(), m_length).release_nonnull();
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}
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return const_cast<StringImpl&>(*this);
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}
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unsigned StringImpl::case_insensitive_hash() const
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{
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return case_insensitive_string_hash(characters(), length());
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}
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void StringImpl::compute_hash() const
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{
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if (!length())
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m_hash = 0;
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else
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m_hash = string_hash(characters(), m_length);
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m_has_hash = true;
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}
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}
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