blob: 15a97576eb77497bac17d86ce9f10277b3d6341a (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
|
#include "coding/reader_writer_ops.hpp"
#include <algorithm>
#include <cstddef>
#include <cstdint>
#include <vector>
namespace rw_ops
{
void Reverse(Reader const & src, Writer & dest)
{
// Read from end, reverse and write directly.
size_t const bufSz = 1024;
std::vector<uint8_t> buffer(bufSz);
uint64_t pos = src.Size();
while (pos > 0)
{
size_t const sz = pos > bufSz ? bufSz : static_cast<size_t>(pos);
ASSERT_GREATER_OR_EQUAL(pos, sz, ());
src.Read(pos - sz, &buffer[0], sz);
std::reverse(buffer.begin(), buffer.begin() + sz);
dest.Write(&buffer[0], sz);
pos -= sz;
}
}
} // namespace rw_ops
|