From 6bf0a5cb5034a7e684dcc3500e841785237ce2dd Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 19:32:43 +0200 Subject: Adding upstream version 1:115.7.0. Signed-off-by: Daniel Baumann --- .../sandbox/chromium/base/strings/string_piece.h | 513 +++++++++++++++++++++ 1 file changed, 513 insertions(+) create mode 100644 security/sandbox/chromium/base/strings/string_piece.h (limited to 'security/sandbox/chromium/base/strings/string_piece.h') diff --git a/security/sandbox/chromium/base/strings/string_piece.h b/security/sandbox/chromium/base/strings/string_piece.h new file mode 100644 index 0000000000..536bf3f023 --- /dev/null +++ b/security/sandbox/chromium/base/strings/string_piece.h @@ -0,0 +1,513 @@ +// Copyright (c) 2012 The Chromium Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. +// Copied from strings/stringpiece.h with modifications +// +// A string-like object that points to a sized piece of memory. +// +// You can use StringPiece as a function or method parameter. A StringPiece +// parameter can receive a double-quoted string literal argument, a "const +// char*" argument, a string argument, or a StringPiece argument with no data +// copying. Systematic use of StringPiece for arguments reduces data +// copies and strlen() calls. +// +// Prefer passing StringPieces by value: +// void MyFunction(StringPiece arg); +// If circumstances require, you may also pass by const reference: +// void MyFunction(const StringPiece& arg); // not preferred +// Both of these have the same lifetime semantics. Passing by value +// generates slightly smaller code. For more discussion, Googlers can see +// the thread go/stringpiecebyvalue on c-users. + +#ifndef BASE_STRINGS_STRING_PIECE_H_ +#define BASE_STRINGS_STRING_PIECE_H_ + +#include + +#include +#include +#include + +#include "base/base_export.h" +#include "base/logging.h" +#include "base/strings/char_traits.h" +#include "base/strings/string16.h" +#include "base/strings/string_piece_forward.h" + +namespace base { + +// internal -------------------------------------------------------------------- + +// Many of the StringPiece functions use different implementations for the +// 8-bit and 16-bit versions, and we don't want lots of template expansions in +// this (very common) header that will slow down compilation. +// +// So here we define overloaded functions called by the StringPiece template. +// For those that share an implementation, the two versions will expand to a +// template internal to the .cc file. +namespace internal { + +BASE_EXPORT void AppendToString(const StringPiece& self, std::string* target); +BASE_EXPORT void AppendToString(const StringPiece16& self, string16* target); + +BASE_EXPORT size_t copy(const StringPiece& self, + char* buf, + size_t n, + size_t pos); +BASE_EXPORT size_t copy(const StringPiece16& self, + char16* buf, + size_t n, + size_t pos); + +BASE_EXPORT size_t find(const StringPiece& self, + const StringPiece& s, + size_t pos); +BASE_EXPORT size_t find(const StringPiece16& self, + const StringPiece16& s, + size_t pos); +BASE_EXPORT size_t find(const StringPiece& self, + char c, + size_t pos); +BASE_EXPORT size_t find(const StringPiece16& self, + char16 c, + size_t pos); + +BASE_EXPORT size_t rfind(const StringPiece& self, + const StringPiece& s, + size_t pos); +BASE_EXPORT size_t rfind(const StringPiece16& self, + const StringPiece16& s, + size_t pos); +BASE_EXPORT size_t rfind(const StringPiece& self, + char c, + size_t pos); +BASE_EXPORT size_t rfind(const StringPiece16& self, + char16 c, + size_t pos); + +BASE_EXPORT size_t find_first_of(const StringPiece& self, + const StringPiece& s, + size_t pos); +BASE_EXPORT size_t find_first_of(const StringPiece16& self, + const StringPiece16& s, + size_t pos); + +BASE_EXPORT size_t find_first_not_of(const StringPiece& self, + const StringPiece& s, + size_t pos); +BASE_EXPORT size_t find_first_not_of(const StringPiece16& self, + const StringPiece16& s, + size_t pos); +BASE_EXPORT size_t find_first_not_of(const StringPiece& self, + char c, + size_t pos); +BASE_EXPORT size_t find_first_not_of(const StringPiece16& self, + char16 c, + size_t pos); + +BASE_EXPORT size_t find_last_of(const StringPiece& self, + const StringPiece& s, + size_t pos); +BASE_EXPORT size_t find_last_of(const StringPiece16& self, + const StringPiece16& s, + size_t pos); +BASE_EXPORT size_t find_last_of(const StringPiece& self, + char c, + size_t pos); +BASE_EXPORT size_t find_last_of(const StringPiece16& self, + char16 c, + size_t pos); + +BASE_EXPORT size_t find_last_not_of(const StringPiece& self, + const StringPiece& s, + size_t pos); +BASE_EXPORT size_t find_last_not_of(const StringPiece16& self, + const StringPiece16& s, + size_t pos); +BASE_EXPORT size_t find_last_not_of(const StringPiece16& self, + char16 c, + size_t pos); +BASE_EXPORT size_t find_last_not_of(const StringPiece& self, + char c, + size_t pos); + +BASE_EXPORT StringPiece substr(const StringPiece& self, + size_t pos, + size_t n); +BASE_EXPORT StringPiece16 substr(const StringPiece16& self, + size_t pos, + size_t n); + +} // namespace internal + +// BasicStringPiece ------------------------------------------------------------ + +// Defines the types, methods, operators, and data members common to both +// StringPiece and StringPiece16. +// +// This is templatized by string class type rather than character type, so +// BasicStringPiece or BasicStringPiece. +template class BasicStringPiece { + public: + // Standard STL container boilerplate. + typedef size_t size_type; + typedef typename STRING_TYPE::value_type value_type; + typedef const value_type* pointer; + typedef const value_type& reference; + typedef const value_type& const_reference; + typedef ptrdiff_t difference_type; + typedef const value_type* const_iterator; + typedef std::reverse_iterator const_reverse_iterator; + + static const size_type npos; + + public: + // We provide non-explicit singleton constructors so users can pass + // in a "const char*" or a "string" wherever a "StringPiece" is + // expected (likewise for char16, string16, StringPiece16). + constexpr BasicStringPiece() : ptr_(NULL), length_(0) {} + // TODO(dcheng): Construction from nullptr is not allowed for + // std::basic_string_view, so remove the special handling for it. + // Note: This doesn't just use STRING_TYPE::traits_type::length(), since that + // isn't constexpr until C++17. + constexpr BasicStringPiece(const value_type* str) + : ptr_(str), length_(!str ? 0 : CharTraits::length(str)) {} + BasicStringPiece(const STRING_TYPE& str) + : ptr_(str.data()), length_(str.size()) {} + constexpr BasicStringPiece(const value_type* offset, size_type len) + : ptr_(offset), length_(len) {} + BasicStringPiece(const typename STRING_TYPE::const_iterator& begin, + const typename STRING_TYPE::const_iterator& end) { + DCHECK(begin <= end) << "StringPiece iterators swapped or invalid."; + length_ = static_cast(std::distance(begin, end)); + + // The length test before assignment is to avoid dereferencing an iterator + // that may point to the end() of a string. + ptr_ = length_ > 0 ? &*begin : nullptr; + } + + // data() may return a pointer to a buffer with embedded NULs, and the + // returned buffer may or may not be null terminated. Therefore it is + // typically a mistake to pass data() to a routine that expects a NUL + // terminated string. + constexpr const value_type* data() const { return ptr_; } + constexpr size_type size() const noexcept { return length_; } + constexpr size_type length() const noexcept { return length_; } + bool empty() const { return length_ == 0; } + + constexpr value_type operator[](size_type i) const { + CHECK(i < length_); + return ptr_[i]; + } + + value_type front() const { + CHECK_NE(0UL, length_); + return ptr_[0]; + } + + value_type back() const { + CHECK_NE(0UL, length_); + return ptr_[length_ - 1]; + } + + constexpr void remove_prefix(size_type n) { + CHECK(n <= length_); + ptr_ += n; + length_ -= n; + } + + constexpr void remove_suffix(size_type n) { + CHECK(n <= length_); + length_ -= n; + } + + constexpr int compare(BasicStringPiece x) const noexcept { + int r = CharTraits::compare( + ptr_, x.ptr_, (length_ < x.length_ ? length_ : x.length_)); + if (r == 0) { + if (length_ < x.length_) r = -1; + else if (length_ > x.length_) r = +1; + } + return r; + } + + // This is the style of conversion preferred by std::string_view in C++17. + explicit operator STRING_TYPE() const { return as_string(); } + + STRING_TYPE as_string() const { + // std::string doesn't like to take a NULL pointer even with a 0 size. + return empty() ? STRING_TYPE() : STRING_TYPE(data(), size()); + } + + const_iterator begin() const { return ptr_; } + const_iterator end() const { return ptr_ + length_; } + const_reverse_iterator rbegin() const { + return const_reverse_iterator(ptr_ + length_); + } + const_reverse_iterator rend() const { + return const_reverse_iterator(ptr_); + } + + size_type max_size() const { return length_; } + size_type capacity() const { return length_; } + + void AppendToString(STRING_TYPE* target) const { + internal::AppendToString(*this, target); + } + + size_type copy(value_type* buf, size_type n, size_type pos = 0) const { + return internal::copy(*this, buf, n, pos); + } + + // Does "this" start with "x" + constexpr bool starts_with(BasicStringPiece x) const noexcept { + return ( + (this->length_ >= x.length_) && + (CharTraits::compare(this->ptr_, x.ptr_, x.length_) == 0)); + } + + // Does "this" end with "x" + constexpr bool ends_with(BasicStringPiece x) const noexcept { + return ((this->length_ >= x.length_) && + (CharTraits::compare( + this->ptr_ + (this->length_ - x.length_), x.ptr_, x.length_) == + 0)); + } + + // find: Search for a character or substring at a given offset. + size_type find(const BasicStringPiece& s, + size_type pos = 0) const { + return internal::find(*this, s, pos); + } + size_type find(value_type c, size_type pos = 0) const { + return internal::find(*this, c, pos); + } + + // rfind: Reverse find. + size_type rfind(const BasicStringPiece& s, + size_type pos = BasicStringPiece::npos) const { + return internal::rfind(*this, s, pos); + } + size_type rfind(value_type c, size_type pos = BasicStringPiece::npos) const { + return internal::rfind(*this, c, pos); + } + + // find_first_of: Find the first occurence of one of a set of characters. + size_type find_first_of(const BasicStringPiece& s, + size_type pos = 0) const { + return internal::find_first_of(*this, s, pos); + } + size_type find_first_of(value_type c, size_type pos = 0) const { + return find(c, pos); + } + + // find_first_not_of: Find the first occurence not of a set of characters. + size_type find_first_not_of(const BasicStringPiece& s, + size_type pos = 0) const { + return internal::find_first_not_of(*this, s, pos); + } + size_type find_first_not_of(value_type c, size_type pos = 0) const { + return internal::find_first_not_of(*this, c, pos); + } + + // find_last_of: Find the last occurence of one of a set of characters. + size_type find_last_of(const BasicStringPiece& s, + size_type pos = BasicStringPiece::npos) const { + return internal::find_last_of(*this, s, pos); + } + size_type find_last_of(value_type c, + size_type pos = BasicStringPiece::npos) const { + return rfind(c, pos); + } + + // find_last_not_of: Find the last occurence not of a set of characters. + size_type find_last_not_of(const BasicStringPiece& s, + size_type pos = BasicStringPiece::npos) const { + return internal::find_last_not_of(*this, s, pos); + } + size_type find_last_not_of(value_type c, + size_type pos = BasicStringPiece::npos) const { + return internal::find_last_not_of(*this, c, pos); + } + + // substr. + BasicStringPiece substr(size_type pos, + size_type n = BasicStringPiece::npos) const { + return internal::substr(*this, pos, n); + } + + protected: + const value_type* ptr_; + size_type length_; +}; + +template +const typename BasicStringPiece::size_type +BasicStringPiece::npos = + typename BasicStringPiece::size_type(-1); + +// MSVC doesn't like complex extern templates and DLLs. +#if !defined(COMPILER_MSVC) +extern template class BASE_EXPORT BasicStringPiece; +extern template class BASE_EXPORT BasicStringPiece; +#endif + +// Comparison operators -------------------------------------------------------- +// operator == +template +constexpr bool operator==(BasicStringPiece lhs, + BasicStringPiece rhs) noexcept { + return lhs.size() == rhs.size() && lhs.compare(rhs) == 0; +} + +// Here and below we make use of std::common_type_t to emulate an identity type +// transformation. This creates a non-deduced context, so that we can compare +// StringPieces with types that implicitly convert to StringPieces. See +// https://wg21.link/n3766 for details. +// Furthermore, we require dummy template parameters for these overloads to work +// around a name mangling issue on Windows. +template +constexpr bool operator==( + BasicStringPiece lhs, + std::common_type_t> rhs) noexcept { + return lhs.size() == rhs.size() && lhs.compare(rhs) == 0; +} + +template +constexpr bool operator==(std::common_type_t> lhs, + BasicStringPiece rhs) noexcept { + return lhs.size() == rhs.size() && lhs.compare(rhs) == 0; +} + +// operator != +template +constexpr bool operator!=(BasicStringPiece lhs, + BasicStringPiece rhs) noexcept { + return !(lhs == rhs); +} + +template +constexpr bool operator!=( + BasicStringPiece lhs, + std::common_type_t> rhs) noexcept { + return !(lhs == rhs); +} + +template +constexpr bool operator!=(std::common_type_t> lhs, + BasicStringPiece rhs) noexcept { + return !(lhs == rhs); +} + +// operator < +template +constexpr bool operator<(BasicStringPiece lhs, + BasicStringPiece rhs) noexcept { + return lhs.compare(rhs) < 0; +} + +template +constexpr bool operator<( + BasicStringPiece lhs, + std::common_type_t> rhs) noexcept { + return lhs.compare(rhs) < 0; +} + +template +constexpr bool operator<(std::common_type_t> lhs, + BasicStringPiece rhs) noexcept { + return lhs.compare(rhs) < 0; +} + +// operator > +template +constexpr bool operator>(BasicStringPiece lhs, + BasicStringPiece rhs) noexcept { + return rhs < lhs; +} + +template +constexpr bool operator>( + BasicStringPiece lhs, + std::common_type_t> rhs) noexcept { + return rhs < lhs; +} + +template +constexpr bool operator>(std::common_type_t> lhs, + BasicStringPiece rhs) noexcept { + return rhs < lhs; +} + +// operator <= +template +constexpr bool operator<=(BasicStringPiece lhs, + BasicStringPiece rhs) noexcept { + return !(rhs < lhs); +} + +template +constexpr bool operator<=( + BasicStringPiece lhs, + std::common_type_t> rhs) noexcept { + return !(rhs < lhs); +} + +template +constexpr bool operator<=(std::common_type_t> lhs, + BasicStringPiece rhs) noexcept { + return !(rhs < lhs); +} + +// operator >= +template +constexpr bool operator>=(BasicStringPiece lhs, + BasicStringPiece rhs) noexcept { + return !(lhs < rhs); +} + +template +constexpr bool operator>=( + BasicStringPiece lhs, + std::common_type_t> rhs) noexcept { + return !(lhs < rhs); +} + +template +constexpr bool operator>=(std::common_type_t> lhs, + BasicStringPiece rhs) noexcept { + return !(lhs < rhs); +} + +BASE_EXPORT std::ostream& operator<<(std::ostream& o, + const StringPiece& piece); + +BASE_EXPORT std::ostream& operator<<(std::ostream& o, + const StringPiece16& piece); + +// Hashing --------------------------------------------------------------------- + +// We provide appropriate hash functions so StringPiece and StringPiece16 can +// be used as keys in hash sets and maps. + +// This hash function is copied from base/strings/string16.h. We don't use the +// ones already defined for string and string16 directly because it would +// require the string constructors to be called, which we don't want. + +template +struct StringPieceHashImpl { + std::size_t operator()(StringPieceType sp) const { + std::size_t result = 0; + for (auto c : sp) + result = (result * 131) + c; + return result; + } +}; + +using StringPieceHash = StringPieceHashImpl; +using StringPiece16Hash = StringPieceHashImpl; +using WStringPieceHash = StringPieceHashImpl; + +} // namespace base + +#endif // BASE_STRINGS_STRING_PIECE_H_ -- cgit v1.2.3