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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
#include "include/interval_set.h"
#include "include/buffer_fwd.h"
#include <map>
#ifndef COMMON_OBJECT_H
#define COMMON_OBJECT_H
enum {
RANDOMWRITEFULL,
DELETED,
CLONERANGE
};
bool test_object_contents();
class ObjectContents {
uint64_t _size;
std::map<uint64_t, unsigned int> seeds;
interval_set<uint64_t> written;
bool _exists;
public:
class Iterator {
ObjectContents *parent;
std::map<uint64_t, unsigned int>::iterator iter;
unsigned int current_state;
int current_val;
uint64_t pos;
private:
unsigned int get_state(uint64_t pos);
public:
explicit Iterator(ObjectContents *parent) :
parent(parent), iter(parent->seeds.end()),
current_state(0), current_val(0), pos(-1) {
seek_to_first();
}
char operator*() {
return parent->written.contains(pos) ?
static_cast<char>(current_val % 256) : '\0';
}
uint64_t get_pos() {
return pos;
}
void seek_to(uint64_t _pos) {
if (pos > _pos ||
(iter != parent->seeds.end() && _pos >= iter->first)) {
iter = parent->seeds.upper_bound(_pos);
--iter;
current_state = iter->second;
current_val = rand_r(¤t_state);
pos = iter->first;
++iter;
}
while (pos < _pos) ++(*this);
}
void seek_to_first() {
seek_to(0);
}
Iterator &operator++() {
++pos;
if (iter != parent->seeds.end() && pos >= iter->first) {
ceph_assert(pos == iter->first);
current_state = iter->second;
++iter;
}
current_val = rand_r(¤t_state);
return *this;
}
bool valid() {
return pos < parent->size();
}
friend class ObjectContents;
};
ObjectContents() : _size(0), _exists(false) {
seeds[0] = 0;
}
explicit ObjectContents(bufferlist::const_iterator &bp) {
decode(_size, bp);
decode(seeds, bp);
decode(written, bp);
decode(_exists, bp);
}
void clone_range(ObjectContents &other,
interval_set<uint64_t> &intervals);
void write(unsigned int seed,
uint64_t from,
uint64_t len);
Iterator get_iterator() {
return Iterator(this);
}
uint64_t size() const { return _size; }
bool exists() { return _exists; }
void debug(std::ostream &out) {
out << "_size is " << _size << std::endl;
out << "seeds is: (";
for (std::map<uint64_t, unsigned int>::iterator i = seeds.begin();
i != seeds.end();
++i) {
out << "[" << i->first << "," << i->second << "], ";
}
out << ")" << std::endl;
out << "written is " << written << std::endl;
out << "_exists is " << _exists << std::endl;
}
void encode(bufferlist &bl) const {
using ceph::encode;
encode(_size, bl);
encode(seeds, bl);
encode(written, bl);
encode(_exists, bl);
}
};
#endif
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