15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Copyright (c) 2009 The Chromium Authors. All rights reserved. 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// found in the LICENSE file. 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 55821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifndef COURGETTE_REGION_H_ 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define COURGETTE_REGION_H_ 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include <string> 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/basictypes.h" 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace courgette { 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// A Region is a descriptor for a region of memory. It has a start address and 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// a length measured in bytes. The Region object does not own the memory. 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)class Region { 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) public: 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Default constructor: and empty region. 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Region() : start_(NULL), length_(0) {} 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Usual constructor for regions given a |start| address and |length|. 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Region(const void* start, size_t length) 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) : start_(static_cast<const uint8*>(start)), 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) length_(length) { 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // String constructor. Region is owned by the string, so the string should 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // have a lifetime greater than the region. 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) explicit Region(const std::string& string) 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) : start_(reinterpret_cast<const uint8*>(string.c_str())), 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) length_(string.length()) { 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Copy constructor. 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Region(const Region& other) : start_(other.start_), length_(other.length_) {} 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Assignment 'operator' makes |this| region the same as |other|. 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Region& assign(const Region& other) { 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) this->start_ = other.start_; 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) this->length_ = other.length_; 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return *this; 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Returns the starting address of the region. 465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const uint8* start() const { return start_; } 475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Returns the length of the region. 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t length() const { return length_; } 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Returns the address after the last byte of the region. 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const uint8* end() const { return start_ + length_; } 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) private: 555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const uint8* start_; 565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t length_; 575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) void operator=(const Region&); // Disallow assignment operator. 595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace 625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif // COURGETTE_REGION_H_ 63