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#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 : 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
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