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#include "buffered.h"
#include <library/cpp/testing/unittest/registar.h>
#include <util/generic/string.h>
#include <util/random/mersenne.h>
Y_UNIT_TEST_SUITE(TestBufferedIO) {
template <class TOut>
inline void Run(TOut&& out) {
TMersenne<ui64> r;
for (size_t i = 0; i < 1000; ++i) {
const size_t c = r.GenRand() % 10000;
TString s;
for (size_t j = 0; j < c; ++j) {
s.append('A' + (r.GenRand() % 10));
}
out.Write(s.data(), s.size());
}
}
Y_UNIT_TEST(TestEqual) {
TString s1;
TString s2;
Run(TBuffered<TStringOutput>(8000, s1));
Run(TAdaptivelyBuffered<TStringOutput>(s2));
UNIT_ASSERT_VALUES_EQUAL(s1, s2);
}
Y_UNIT_TEST(Test1) {
TString s;
TBuffered<TStringOutput>(100, s).Write("1", 1);
UNIT_ASSERT_VALUES_EQUAL(s, "1");
}
Y_UNIT_TEST(Test2) {
TString s;
TBuffered<TStringOutput>(1, s).Write("12", 2);
UNIT_ASSERT_VALUES_EQUAL(s, "12");
}
Y_UNIT_TEST(Test3) {
TString s;
auto&& b = TBuffered<TStringOutput>(1, s);
b.Write("1", 1);
b.Write("12", 2);
b.Finish();
UNIT_ASSERT_VALUES_EQUAL(s, "112");
}
Y_UNIT_TEST(Test4) {
TString s;
auto&& b = TBuffered<TStringOutput>(1, s);
b.Write('1');
b.Write('2');
b.Write('3');
b.Finish();
UNIT_ASSERT_VALUES_EQUAL(s, "123");
}
template <class TOut>
inline void DoGenAndWrite(TOut&& output, TString& str) {
TMersenne<ui64> r;
for (size_t i = 0; i < 43210; ++i) {
str.append('A' + (r.GenRand() % 10));
}
size_t written = 0;
void* ptr = nullptr;
while (written < str.size()) {
size_t bufferSize = output.Next(&ptr);
UNIT_ASSERT(ptr && bufferSize > 0);
size_t toWrite = Min(bufferSize, str.size() - written);
memcpy(ptr, str.begin() + written, toWrite);
written += toWrite;
if (toWrite < bufferSize) {
output.Undo(bufferSize - toWrite);
}
}
}
Y_UNIT_TEST(TestWriteViaNextAndUndo) {
TString str1, str2;
DoGenAndWrite(TBuffered<TStringOutput>(5000, str1), str2);
UNIT_ASSERT_STRINGS_EQUAL(str1, str2);
}
Y_UNIT_TEST(TestWriteViaNextAndUndoAdaptive) {
TString str1, str2;
DoGenAndWrite(TAdaptivelyBuffered<TStringOutput>(str1), str2);
UNIT_ASSERT_STRINGS_EQUAL(str1, str2);
}
Y_UNIT_TEST(TestInput) {
TString s("0123456789abcdefghijklmn");
TBuffered<TStringInput> in(5, s);
char c;
UNIT_ASSERT_VALUES_EQUAL(in.Read(&c, 1), 1); // 1
UNIT_ASSERT_VALUES_EQUAL(c, '0');
UNIT_ASSERT_VALUES_EQUAL(in.Skip(4), 4); // 5 end of buffer
UNIT_ASSERT_VALUES_EQUAL(in.Read(&c, 1), 1); // 6
UNIT_ASSERT_VALUES_EQUAL(c, '5');
UNIT_ASSERT_VALUES_EQUAL(in.Skip(3), 3); // 9
UNIT_ASSERT_VALUES_EQUAL(in.Read(&c, 1), 1); // 10 end of buffer
UNIT_ASSERT_VALUES_EQUAL(c, '9');
UNIT_ASSERT_VALUES_EQUAL(in.Skip(3), 3); // 13
UNIT_ASSERT_VALUES_EQUAL(in.Read(&c, 1), 1); // 14 start new buffer
UNIT_ASSERT_VALUES_EQUAL(c, 'd');
UNIT_ASSERT_VALUES_EQUAL(in.Skip(6), 6); // 20
UNIT_ASSERT_VALUES_EQUAL(in.Read(&c, 1), 1); // 21 start new buffer
UNIT_ASSERT_VALUES_EQUAL(c, 'k');
UNIT_ASSERT_VALUES_EQUAL(in.Skip(6), 3); // 24 eof
}
Y_UNIT_TEST(TestReadTo) {
TString s("0123456789abc");
TBuffered<TStringInput> in(2, s);
TString t;
UNIT_ASSERT_VALUES_EQUAL(in.ReadTo(t, '7'), 8);
UNIT_ASSERT_VALUES_EQUAL(t, "0123456");
UNIT_ASSERT_VALUES_EQUAL(in.ReadTo(t, '8'), 1);
UNIT_ASSERT_VALUES_EQUAL(t, "");
UNIT_ASSERT_VALUES_EQUAL(in.ReadTo(t, 'z'), 4);
UNIT_ASSERT_VALUES_EQUAL(t, "9abc");
}
}
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