void testVarint(uint64_t val, std::initializer_list<uint8_t> bytes) {
size_t n = bytes.size();
ByteRange expected(&*bytes.begin(), n);
{
uint8_t buf[kMaxVarintLength64];
EXPECT_EQ(expected.size(), encodeVarint(val, buf));
EXPECT_TRUE(ByteRange(buf, expected.size()) == expected);
}
{
ByteRange r = expected;
uint64_t decoded = decodeVarint(r);
EXPECT_TRUE(r.empty());
EXPECT_EQ(val, decoded);
}
if (n < kMaxVarintLength64) {
// Try from a full buffer too, different code path
uint8_t buf[kMaxVarintLength64];
memcpy(buf, &*bytes.begin(), n);
uint8_t fills[] = {0, 0x7f, 0x80, 0xff};
for (uint8_t fill : fills) {
memset(buf + n, fill, kMaxVarintLength64 - n);
ByteRange r(buf, kMaxVarintLength64);
uint64_t decoded = decodeVarint(r);
EXPECT_EQ(val, decoded);
EXPECT_EQ(kMaxVarintLength64 - n, r.size());
}
}
}
void RecordIOReader::Iterator::advanceToValid() {
ByteRange record = findRecord(range_, fileId_).record;
if (record.empty()) {
recordAndPos_ = std::make_pair(ByteRange(), off_t(-1));
range_.clear(); // at end
} else {
size_t skipped = record.begin() - range_.begin();
DCHECK_GE(skipped, headerSize());
skipped -= headerSize();
range_.advance(skipped);
recordAndPos_.first = record;
recordAndPos_.second += skipped;
}
}
