ClickHouse/dbms/IO/tests/var_uint.cpp

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#include <string>
#include <iostream>
#include <IO/VarInt.h>
#include <IO/WriteBufferFromString.h>
#include <IO/ReadBufferFromString.h>
#include <IO/ReadHelpers.h>
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#include <Poco/HexBinaryEncoder.h>
static void parse_trash_string_as_uint_must_fail(const std::string & str)
{
using namespace DB;
unsigned x = 0xFF;
try
{
x = parse<unsigned>(str);
}
catch (...)
{
/// Ok
return;
}
std::cerr << "Parsing must fail, but finished sucessfully x=" << x;
exit(-1);
}
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int main(int argc, char ** argv)
{
parse_trash_string_as_uint_must_fail("trash");
parse_trash_string_as_uint_must_fail("-1");
if (argc != 2)
{
std::cerr << "Usage: " << std::endl
<< argv[0] << " unsigned_number" << std::endl;
return 1;
}
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DB::UInt64 x = DB::parse<UInt64>(argv[1]);
Poco::HexBinaryEncoder hex(std::cout);
DB::writeVarUInt(x, hex);
std::cout << std::endl;
std::string s;
{
DB::WriteBufferFromString wb(s);
DB::writeVarUInt(x, wb);
wb.next();
}
hex << s;
std::cout << std::endl;
s.clear();
s.resize(9);
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s.resize(DB::writeVarUInt(x, s.data()) - s.data());
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hex << s;
std::cout << std::endl;
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DB::UInt64 y = 0;
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DB::ReadBufferFromString rb(s);
DB::readVarUInt(y, rb);
std::cerr << "x: " << x << ", y: " << y << std::endl;
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return 0;
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}