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

security/sandbox/chromium/base/strings/string_piece.h@6474c204b198 (annotated)

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

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 // 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 / annotate

security/sandbox/chromium/base/strings/string_piece.h@6474c204b198 (annotated)

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