The Tor Browser: comparison security/sandbox/chromium/base/strings/string

--1:000000000000
+:7cb48bc47cf8
+// 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.
+//
+// Functions or methods may use const StringPiece& parameters to accept either
+// a "const char*" or a "string" value that will be implicitly converted to
+// a StringPiece.  The implicit conversion means that it is often appropriate
+// to include this .h file in other files rather than forward-declaring
+// StringPiece as would be appropriate for most other Google classes.
+//
+// Systematic usage of StringPiece is encouraged as it will reduce unnecessary
+// conversions from "const char*" to "string" and back again.
+//
+// StringPiece16 is similar to StringPiece but for base::string16 instead of
+// std::string. We do not define as large of a subset of the STL functions
+// from basic_string as in StringPiece, but this can be changed if these
+// functions (find, find_first_of, etc.) are found to be useful in this context.
+//
+#ifndef BASE_STRINGS_STRING_PIECE_H_
+#define BASE_STRINGS_STRING_PIECE_H_
+#include <stddef.h>
+#include <iosfwd>
+#include <string>
+#include "base/base_export.h"
+#include "base/basictypes.h"
+#include "base/containers/hash_tables.h"
+#include "base/strings/string16.h"
+namespace base {
+template <typename STRING_TYPE> class BasicStringPiece;
+typedef BasicStringPiece<std::string> StringPiece;
+typedef BasicStringPiece<string16> StringPiece16;
+namespace internal {
+// Defines the types, methods, operators, and data members common to both
+// StringPiece and StringPiece16. Do not refer to this class directly, but
+// rather to BasicStringPiece, StringPiece, or StringPiece16.
+template <typename STRING_TYPE> class StringPieceDetail {
+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_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).
+StringPieceDetail() : ptr_(NULL), length_(0) {}
+StringPieceDetail(const value_type* str)
+: ptr_(str),
+length_((str == NULL) ? 0 : STRING_TYPE::traits_type::length(str)) {}
+StringPieceDetail(const STRING_TYPE& str)
+: ptr_(str.data()), length_(str.size()) {}
+StringPieceDetail(const value_type* offset, size_type len)
+: ptr_(offset), length_(len) {}
+StringPieceDetail(const typename STRING_TYPE::const_iterator& begin,
+const typename STRING_TYPE::const_iterator& end)
+: ptr_((end > begin) ? &(*begin) : NULL),
+length_((end > begin) ? (size_type)(end - begin) : 0) {}
+// 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.
+const value_type* data() const { return ptr_; }
+size_type size() const { return length_; }
+size_type length() const { return length_; }
+bool empty() const { return length_ == 0; }
+void clear() {
+ptr_ = NULL;
+length_ = 0;
+}
+void set(const value_type* data, size_type len) {
+ptr_ = data;
+length_ = len;
+}
+void set(const value_type* str) {
+ptr_ = str;
+length_ = str ? STRING_TYPE::traits_type::length(str) : 0;
+}
+value_type operator[](size_type i) const { return ptr_[i]; }
+void remove_prefix(size_type n) {
+ptr_ += n;
+length_ -= n;
+}
+void remove_suffix(size_type n) {
+length_ -= n;
+}
+int compare(const BasicStringPiece<STRING_TYPE>& x) const {
+int r = wordmemcmp(
+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;
+}
+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_; }
+static int wordmemcmp(const value_type* p,
+const value_type* p2,
+size_type N) {
+return STRING_TYPE::traits_type::compare(p, p2, N);
+}
+protected:
+const value_type* ptr_;
+size_type     length_;
+};
+template <typename STRING_TYPE>
+const typename StringPieceDetail<STRING_TYPE>::size_type
+StringPieceDetail<STRING_TYPE>::npos =
+typename StringPieceDetail<STRING_TYPE>::size_type(-1);
+// MSVC doesn't like complex extern templates and DLLs.
+#if !defined(COMPILER_MSVC)
+extern template class BASE_EXPORT StringPieceDetail<std::string>;
+extern template class BASE_EXPORT StringPieceDetail<string16>;
+#endif
+BASE_EXPORT void CopyToString(const StringPiece& self, std::string* target);
+BASE_EXPORT void AppendToString(const StringPiece& self, std::string* target);
+BASE_EXPORT StringPieceDetail<std::string>::size_type copy(
+const StringPiece& self,
+char* buf,
+StringPieceDetail<std::string>::size_type n,
+StringPieceDetail<std::string>::size_type pos);
+BASE_EXPORT StringPieceDetail<std::string>::size_type find(
+const StringPiece& self,
+const StringPiece& s,
+StringPieceDetail<std::string>::size_type pos);
+BASE_EXPORT StringPieceDetail<std::string>::size_type find(
+const StringPiece& self,
+char c,
+StringPieceDetail<std::string>::size_type pos);
+BASE_EXPORT StringPieceDetail<std::string>::size_type rfind(
+const StringPiece& self,
+const StringPiece& s,
+StringPieceDetail<std::string>::size_type pos);
+BASE_EXPORT StringPieceDetail<std::string>::size_type rfind(
+const StringPiece& self,
+char c,
+StringPieceDetail<std::string>::size_type pos);
+BASE_EXPORT StringPieceDetail<std::string>::size_type find_first_of(
+const StringPiece& self,
+const StringPiece& s,
+StringPieceDetail<std::string>::size_type pos);
+BASE_EXPORT StringPieceDetail<std::string>::size_type find_first_not_of(
+const StringPiece& self,
+const StringPiece& s,
+StringPieceDetail<std::string>::size_type pos);
+BASE_EXPORT StringPieceDetail<std::string>::size_type find_first_not_of(
+const StringPiece& self,
+char c,
+StringPieceDetail<std::string>::size_type pos);
+BASE_EXPORT StringPieceDetail<std::string>::size_type find_last_of(
+const StringPiece& self,
+const StringPiece& s,
+StringPieceDetail<std::string>::size_type pos);
+BASE_EXPORT StringPieceDetail<std::string>::size_type find_last_of(
+const StringPiece& self,
+char c,
+StringPieceDetail<std::string>::size_type pos);
+BASE_EXPORT StringPieceDetail<std::string>::size_type find_last_not_of(
+const StringPiece& self,
+const StringPiece& s,
+StringPieceDetail<std::string>::size_type pos);
+BASE_EXPORT StringPieceDetail<std::string>::size_type find_last_not_of(
+const StringPiece& self,
+char c,
+StringPieceDetail<std::string>::size_type pos);
+BASE_EXPORT StringPiece substr(const StringPiece& self,
+StringPieceDetail<std::string>::size_type pos,
+StringPieceDetail<std::string>::size_type n);
+}  // namespace internal
+// Defines the template type that is instantiated as either StringPiece or
+// StringPiece16.
+template <typename STRING_TYPE> class BasicStringPiece :
+public internal::StringPieceDetail<STRING_TYPE> {
+public:
+typedef typename internal::StringPieceDetail<STRING_TYPE>::value_type
+value_type;
+typedef typename internal::StringPieceDetail<STRING_TYPE>::size_type
+size_type;
+BasicStringPiece() {}
+BasicStringPiece(const value_type*str)
+: internal::StringPieceDetail<STRING_TYPE>(str) {}
+BasicStringPiece(const STRING_TYPE& str)
+: internal::StringPieceDetail<STRING_TYPE>(str) {}
+BasicStringPiece(const value_type* offset, size_type len)
+: internal::StringPieceDetail<STRING_TYPE>(offset, len) {}
+BasicStringPiece(const typename STRING_TYPE::const_iterator& begin,
+const typename STRING_TYPE::const_iterator& end)
+: internal::StringPieceDetail<STRING_TYPE>(begin, end) {}
+};
+// Specializes BasicStringPiece for std::string to add a few operations that
+// are not needed for string16.
+template <> class BasicStringPiece<std::string> :
+public internal::StringPieceDetail<std::string> {
+public:
+BasicStringPiece() {}
+BasicStringPiece(const char* str)
+: internal::StringPieceDetail<std::string>(str) {}
+BasicStringPiece(const std::string& str)
+: internal::StringPieceDetail<std::string>(str) {}
+BasicStringPiece(const char* offset, size_type len)
+: internal::StringPieceDetail<std::string>(offset, len) {}
+BasicStringPiece(const std::string::const_iterator& begin,
+const std::string::const_iterator& end)
+: internal::StringPieceDetail<std::string>(begin, end) {}
+// Prevent the following overload of set() from hiding the definitions in the
+// base class.
+using internal::StringPieceDetail<std::string>::set;
+void set(const void* data, size_type len) {
+ptr_ = reinterpret_cast<const value_type*>(data);
+length_ = len;
+}
+void CopyToString(std::string* target) const {
+internal::CopyToString(*this, target);
+}
+void AppendToString(std::string* target) const {
+internal::AppendToString(*this, target);
+}
+// Does "this" start with "x"
+bool starts_with(const BasicStringPiece& x) const {
+return ((length_ >= x.length_) &&
+(wordmemcmp(ptr_, x.ptr_, x.length_) == 0));
+}
+// Does "this" end with "x"
+bool ends_with(const BasicStringPiece& x) const {
+return ((length_ >= x.length_) &&
+(wordmemcmp(ptr_ + (length_-x.length_), x.ptr_, x.length_) == 0));
+}
+size_type copy(char* buf, size_type n, size_type pos = 0) const {
+return internal::copy(*this, buf, n, pos);
+}
+size_type find(const BasicStringPiece& s, size_type pos = 0) const {
+return internal::find(*this, s, pos);
+}
+size_type find(char c, size_type pos = 0) const {
+return internal::find(*this, c, pos);
+}
+size_type rfind(const BasicStringPiece& s, size_type pos = npos) const {
+return internal::rfind(*this, s, pos);
+}
+size_type rfind(char c, size_type pos = npos) const {
+return internal::rfind(*this, c, pos);
+}
+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(char c, size_type pos = 0) const {
+return find(c, pos);
+}
+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(char c, size_type pos = 0) const {
+return internal::find_first_not_of(*this, c, pos);
+}
+size_type find_last_of(const BasicStringPiece& s,
+size_type pos = npos) const {
+return internal::find_last_of(*this, s, pos);
+}
+size_type find_last_of(char c, size_type pos = npos) const {
+return rfind(c, pos);
+}
+size_type find_last_not_of(const BasicStringPiece& s,
+size_type pos = npos) const {
+return internal::find_last_not_of(*this, s, pos);
+}
+size_type find_last_not_of(char c, size_type pos = npos) const {
+return internal::find_last_not_of(*this, c, pos);
+}
+BasicStringPiece substr(size_type pos, size_type n = npos) const {
+return internal::substr(*this, pos, n);
+}
+};
+// MSVC doesn't like complex extern templates and DLLs.
+#if !defined(COMPILER_MSVC)
+// We can't explicitly declare the std::string instantiation here because it was
+// already instantiated when specialized, above. Not only is it a no-op, but
+// currently it also crashes Clang (see http://crbug.com/107412).
+extern template class BASE_EXPORT BasicStringPiece<string16>;
+#endif
+BASE_EXPORT bool operator==(const StringPiece& x, const StringPiece& y);
+inline bool operator!=(const StringPiece& x, const StringPiece& y) {
+return !(x == y);
+}
+inline bool operator<(const StringPiece& x, const StringPiece& y) {
+const int r = StringPiece::wordmemcmp(
+x.data(), y.data(), (x.size() < y.size() ? x.size() : y.size()));
+return ((r < 0) || ((r == 0) && (x.size() < y.size())));
+}
+inline bool operator>(const StringPiece& x, const StringPiece& y) {
+return y < x;
+}
+inline bool operator<=(const StringPiece& x, const StringPiece& y) {
+return !(x > y);
+}
+inline bool operator>=(const StringPiece& x, const StringPiece& y) {
+return !(x < y);
+}
+inline bool operator==(const StringPiece16& x, const StringPiece16& y) {
+if (x.size() != y.size())
+return false;
+return StringPiece16::wordmemcmp(x.data(), y.data(), x.size()) == 0;
+}
+inline bool operator!=(const StringPiece16& x, const StringPiece16& y) {
+return !(x == y);
+}
+inline bool operator<(const StringPiece16& x, const StringPiece16& y) {
+const int r = StringPiece16::wordmemcmp(
+x.data(), y.data(), (x.size() < y.size() ? x.size() : y.size()));
+return ((r < 0) || ((r == 0) && (x.size() < y.size())));
+}
+inline bool operator>(const StringPiece16& x, const StringPiece16& y) {
+return y < x;
+}
+inline bool operator<=(const StringPiece16& x, const StringPiece16& y) {
+return !(x > y);
+}
+inline bool operator>=(const StringPiece16& x, const StringPiece16& y) {
+return !(x < y);
+}
+BASE_EXPORT std::ostream& operator<<(std::ostream& o,
+const StringPiece& piece);
+}  // namespace base
+// 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/containers/hash_tables.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.
+#define HASH_STRING_PIECE(StringPieceType, string_piece)                \
+std::size_t result = 0;                                               \
+for (StringPieceType::const_iterator i = string_piece.begin();        \
+i != string_piece.end(); ++i)                                    \
+result = (result * 131) + *i;                                       \
+return result;                                                        \
+namespace BASE_HASH_NAMESPACE {
+#if defined(COMPILER_GCC)
+template<>
+struct hash<base::StringPiece> {
+std::size_t operator()(const base::StringPiece& sp) const {
+HASH_STRING_PIECE(base::StringPiece, sp);
+}
+};
+template<>
+struct hash<base::StringPiece16> {
+std::size_t operator()(const base::StringPiece16& sp16) const {
+HASH_STRING_PIECE(base::StringPiece16, sp16);
+}
+};
+#elif defined(COMPILER_MSVC)
+inline size_t hash_value(const base::StringPiece& sp) {
+HASH_STRING_PIECE(base::StringPiece, sp);
+}
+inline size_t hash_value(const base::StringPiece16& sp16) {
+HASH_STRING_PIECE(base::StringPiece16, sp16);
+}
+#endif  // COMPILER
+}  // namespace BASE_HASH_NAMESPACE
+#endif  // BASE_STRINGS_STRING_PIECE_H_

The Tor Browser / file comparison

comparison: security/sandbox/chromium/base/strings/string_piece.h

security/sandbox/chromium/base/strings/string_piece.h