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This prevents, for example: StringView view = ByteString { "foo" }.view(); This prevents a class of potential UAF.
403 lines
11 KiB
C++
403 lines
11 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/ByteBuffer.h>
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#include <AK/ByteString.h>
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#include <AK/DeprecatedFlyString.h>
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#include <AK/Format.h>
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#include <AK/Function.h>
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#include <AK/StdLibExtras.h>
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#include <AK/StringView.h>
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#include <AK/Utf8View.h>
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#include <AK/Vector.h>
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namespace AK {
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bool ByteString::operator==(DeprecatedFlyString const& fly_string) const
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{
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return m_impl == fly_string.impl() || view() == fly_string.view();
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}
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bool ByteString::operator==(ByteString const& other) const
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{
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return m_impl == other.impl() || view() == other.view();
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}
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bool ByteString::operator==(StringView other) const
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{
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if (other.is_null())
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return is_empty();
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return view() == other;
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}
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bool ByteString::operator<(ByteString const& other) const
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{
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return view() < other.view();
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}
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bool ByteString::operator>(ByteString const& other) const
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{
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return view() > other.view();
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}
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bool ByteString::copy_characters_to_buffer(char* buffer, size_t buffer_size) const
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{
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// We must fit at least the NUL-terminator.
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VERIFY(buffer_size > 0);
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size_t characters_to_copy = min(length(), buffer_size - 1);
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__builtin_memcpy(buffer, characters(), characters_to_copy);
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buffer[characters_to_copy] = 0;
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return characters_to_copy == length();
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}
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ByteString ByteString::isolated_copy() const
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{
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if (m_impl->length() == 0)
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return empty();
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char* buffer;
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auto impl = StringImpl::create_uninitialized(length(), buffer);
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memcpy(buffer, m_impl->characters(), m_impl->length());
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return ByteString(move(*impl));
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}
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ByteString ByteString::substring(size_t start, size_t length) const
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{
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if (!length)
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return ByteString::empty();
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VERIFY(!Checked<size_t>::addition_would_overflow(start, length));
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VERIFY(start + length <= m_impl->length());
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return { characters() + start, length };
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}
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ByteString ByteString::substring(size_t start) const
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{
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VERIFY(start <= length());
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return { characters() + start, length() - start };
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}
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StringView ByteString::substring_view(size_t start, size_t length) const&
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{
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VERIFY(!Checked<size_t>::addition_would_overflow(start, length));
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VERIFY(start + length <= m_impl->length());
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return { characters() + start, length };
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}
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StringView ByteString::substring_view(size_t start) const&
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{
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VERIFY(start <= length());
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return { characters() + start, length() - start };
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}
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Vector<ByteString> ByteString::split(char separator, SplitBehavior split_behavior) const
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{
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return split_limit(separator, 0, split_behavior);
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}
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Vector<ByteString> ByteString::split_limit(char separator, size_t limit, SplitBehavior split_behavior) const
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{
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if (is_empty())
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return {};
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Vector<ByteString> v;
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size_t substart = 0;
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bool keep_empty = has_flag(split_behavior, SplitBehavior::KeepEmpty);
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bool keep_separator = has_flag(split_behavior, SplitBehavior::KeepTrailingSeparator);
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for (size_t i = 0; i < length() && (v.size() + 1) != limit; ++i) {
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char ch = characters()[i];
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if (ch == separator) {
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size_t sublen = i - substart;
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if (sublen != 0 || keep_empty)
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v.append(substring(substart, keep_separator ? sublen + 1 : sublen));
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substart = i + 1;
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}
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}
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size_t taillen = length() - substart;
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if (taillen != 0 || keep_empty)
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v.append(substring(substart, taillen));
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return v;
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}
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Vector<StringView> ByteString::split_view(Function<bool(char)> separator, SplitBehavior split_behavior) const&
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{
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if (is_empty())
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return {};
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Vector<StringView> v;
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size_t substart = 0;
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bool keep_empty = has_flag(split_behavior, SplitBehavior::KeepEmpty);
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bool keep_separator = has_flag(split_behavior, SplitBehavior::KeepTrailingSeparator);
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for (size_t i = 0; i < length(); ++i) {
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char ch = characters()[i];
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if (separator(ch)) {
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size_t sublen = i - substart;
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if (sublen != 0 || keep_empty)
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v.append(substring_view(substart, keep_separator ? sublen + 1 : sublen));
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substart = i + 1;
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}
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}
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size_t taillen = length() - substart;
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if (taillen != 0 || keep_empty)
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v.append(substring_view(substart, taillen));
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return v;
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}
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Vector<StringView> ByteString::split_view(char const separator, SplitBehavior split_behavior) const&
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{
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return split_view([separator](char ch) { return ch == separator; }, split_behavior);
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}
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ByteBuffer ByteString::to_byte_buffer() const
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{
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// FIXME: Handle OOM failure.
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return ByteBuffer::copy(bytes()).release_value_but_fixme_should_propagate_errors();
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}
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bool ByteString::starts_with(StringView str, CaseSensitivity case_sensitivity) const
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{
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return StringUtils::starts_with(*this, str, case_sensitivity);
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}
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bool ByteString::starts_with(char ch) const
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{
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if (is_empty())
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return false;
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return characters()[0] == ch;
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}
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bool ByteString::ends_with(StringView str, CaseSensitivity case_sensitivity) const
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{
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return StringUtils::ends_with(*this, str, case_sensitivity);
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}
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bool ByteString::ends_with(char ch) const
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{
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if (is_empty())
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return false;
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return characters()[length() - 1] == ch;
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}
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ByteString ByteString::repeated(char ch, size_t count)
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{
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if (!count)
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return empty();
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char* buffer;
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auto impl = StringImpl::create_uninitialized(count, buffer);
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memset(buffer, ch, count);
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return *impl;
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}
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ByteString ByteString::repeated(StringView string, size_t count)
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{
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if (!count || string.is_empty())
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return empty();
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char* buffer;
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auto impl = StringImpl::create_uninitialized(count * string.length(), buffer);
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for (size_t i = 0; i < count; i++)
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__builtin_memcpy(buffer + i * string.length(), string.characters_without_null_termination(), string.length());
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return *impl;
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}
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ByteString ByteString::bijective_base_from(size_t value, unsigned base, StringView map)
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{
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value++;
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if (map.is_null())
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map = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"sv;
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VERIFY(base >= 2 && base <= map.length());
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// The '8 bits per byte' assumption may need to go?
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Array<char, round_up_to_power_of_two(sizeof(size_t) * 8 + 1, 2)> buffer;
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size_t i = 0;
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do {
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auto remainder = value % base;
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auto new_value = value / base;
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if (remainder == 0) {
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new_value--;
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remainder = map.length();
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}
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buffer[i++] = map[remainder - 1];
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value = new_value;
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} while (value > 0);
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for (size_t j = 0; j < i / 2; ++j)
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swap(buffer[j], buffer[i - j - 1]);
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return ByteString { ReadonlyBytes(buffer.data(), i) };
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}
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ByteString ByteString::roman_number_from(size_t value)
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{
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if (value > 3999)
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return ByteString::number(value);
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StringBuilder builder;
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while (value > 0) {
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if (value >= 1000) {
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builder.append('M');
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value -= 1000;
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} else if (value >= 900) {
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builder.append("CM"sv);
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value -= 900;
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} else if (value >= 500) {
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builder.append('D');
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value -= 500;
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} else if (value >= 400) {
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builder.append("CD"sv);
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value -= 400;
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} else if (value >= 100) {
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builder.append('C');
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value -= 100;
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} else if (value >= 90) {
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builder.append("XC"sv);
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value -= 90;
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} else if (value >= 50) {
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builder.append('L');
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value -= 50;
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} else if (value >= 40) {
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builder.append("XL"sv);
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value -= 40;
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} else if (value >= 10) {
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builder.append('X');
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value -= 10;
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} else if (value == 9) {
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builder.append("IX"sv);
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value -= 9;
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} else if (value >= 5 && value <= 8) {
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builder.append('V');
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value -= 5;
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} else if (value == 4) {
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builder.append("IV"sv);
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value -= 4;
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} else if (value <= 3) {
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builder.append('I');
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value -= 1;
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}
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}
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return builder.to_byte_string();
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}
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bool ByteString::matches(StringView mask, Vector<MaskSpan>& mask_spans, CaseSensitivity case_sensitivity) const
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{
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return StringUtils::matches(*this, mask, case_sensitivity, &mask_spans);
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}
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bool ByteString::matches(StringView mask, CaseSensitivity case_sensitivity) const
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{
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return StringUtils::matches(*this, mask, case_sensitivity);
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}
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bool ByteString::contains(StringView needle, CaseSensitivity case_sensitivity) const
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{
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return StringUtils::contains(*this, needle, case_sensitivity);
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}
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bool ByteString::contains(char needle, CaseSensitivity case_sensitivity) const
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{
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return StringUtils::contains(*this, StringView(&needle, 1), case_sensitivity);
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}
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bool ByteString::equals_ignoring_ascii_case(StringView other) const
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{
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return StringUtils::equals_ignoring_ascii_case(view(), other);
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}
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ByteString ByteString::reverse() const
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{
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StringBuilder reversed_string(length());
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for (size_t i = length(); i-- > 0;) {
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reversed_string.append(characters()[i]);
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}
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return reversed_string.to_byte_string();
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}
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ByteString escape_html_entities(StringView html)
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{
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StringBuilder builder;
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for (size_t i = 0; i < html.length(); ++i) {
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if (html[i] == '<')
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builder.append("<"sv);
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else if (html[i] == '>')
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builder.append(">"sv);
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else if (html[i] == '&')
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builder.append("&"sv);
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else if (html[i] == '"')
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builder.append("""sv);
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else
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builder.append(html[i]);
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}
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return builder.to_byte_string();
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}
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ByteString::ByteString(DeprecatedFlyString const& string)
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: m_impl(string.impl())
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{
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}
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ByteString ByteString::to_lowercase() const
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{
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return m_impl->to_lowercase();
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}
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ByteString ByteString::to_uppercase() const
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{
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return m_impl->to_uppercase();
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}
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ByteString ByteString::to_snakecase() const
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{
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return StringUtils::to_snakecase(*this);
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}
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ByteString ByteString::to_titlecase() const
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{
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return StringUtils::to_titlecase(*this);
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}
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ByteString ByteString::invert_case() const
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{
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return StringUtils::invert_case(*this);
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}
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bool ByteString::operator==(char const* cstring) const
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{
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if (!cstring)
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return is_empty();
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return view() == cstring;
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}
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ByteString ByteString::vformatted(StringView fmtstr, TypeErasedFormatParams& params)
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{
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StringBuilder builder;
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MUST(vformat(builder, fmtstr, params));
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return builder.to_byte_string();
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}
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Vector<size_t> ByteString::find_all(StringView needle) const
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{
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return StringUtils::find_all(*this, needle);
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}
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DeprecatedStringCodePointIterator ByteString::code_points() const
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{
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return DeprecatedStringCodePointIterator(*this);
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}
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ErrorOr<ByteString> ByteString::from_utf8(ReadonlyBytes bytes)
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{
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if (!Utf8View(bytes).validate())
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return Error::from_string_literal("ByteString::from_utf8: Input was not valid UTF-8");
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return ByteString { *StringImpl::create(bytes) };
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}
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}
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