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// Copyright (c) 2009 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.
#ifndef COURGETTE_REGION_H_
#define COURGETTE_REGION_H_
#include <string>
#include "base/basictypes.h"
namespace courgette {
// A Region is a descriptor for a region of memory. It has a start address and
// a length measured in bytes. The Region object does not own the memory.
//
class Region {
public:
// Default constructor: and empty region.
Region() : start_(NULL), length_(0) {}
// Usual constructor for regions given a |start| address and |length|.
Region(const void* start, size_t length)
: start_(static_cast<const uint8*>(start)),
length_(length) {
}
// String constructor. Region is owned by the string, so the string should
// have a lifetime greater than the region.
explicit Region(const std::string& string)
: start_(reinterpret_cast<const uint8*>(string.c_str())),
length_(string.length()) {
}
// Copy constructor.
Region(const Region& other) : start_(other.start_), length_(other.length_) {}
// Assignment 'operator' makes |this| region the same as |other|.
Region& assign(const Region& other) {
this->start_ = other.start_;
this->length_ = other.length_;
return *this;
}
// Returns the starting address of the region.
const uint8* start() const { return start_; }
// Returns the length of the region.
size_t length() const { return length_; }
// Returns the address after the last byte of the region.
const uint8* end() const { return start_ + length_; }
private:
const uint8* start_;
size_t length_;
void operator=(const Region&); // Disallow assignment operator.
};
} // namespace
#endif // COURGETTE_REGION_H_
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