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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#include <random>
#include "CDC.h"
#include "FastCDC.h"
#include "FixedCDC.h"
std::unique_ptr<CDC> CDC::create(
const std::string& type,
int bits,
int windowbits)
{
if (type == "fastcdc") {
return std::unique_ptr<CDC>(new FastCDC(bits, windowbits));
}
if (type == "fixed") {
return std::unique_ptr<CDC>(new FixedCDC(bits, windowbits));
}
return nullptr;
}
void generate_buffer(int size, bufferlist *outbl, int seed)
{
std::mt19937_64 engine, engine2;
engine.seed(seed);
engine2.seed(seed);
// assemble from randomly-sized segments!
outbl->clear();
auto left = size;
while (left) {
size_t l = std::min<size_t>((engine2() & 0xffff0) + 16, left);
left -= l;
bufferptr p(l);
p.set_length(l);
char *b = p.c_str();
for (size_t i = 0; i < l / sizeof(uint64_t); ++i) {
((ceph_le64 *)b)[i] = ceph_le64(engine());
}
outbl->append(p);
}
}
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