void readIntText(T & x, DB::ReadBuffer & buf)
{
bool negative = false;
x = 0;
if (unlikely(buf.eof()))
DB::throwReadAfterEOF();
if (std::is_signed<T>::value && *buf.position() == '-')
{
++buf.position();
negative = true;
}
if (*buf.position() == '0')
{
++buf.position();
return;
}
while (!buf.eof())
{
if ((*buf.position() & 0xF0) == 0x30)
{
x *= 10;
x += *buf.position() & 0x0F;
++buf.position();
}
else
break;
}
if (std::is_signed<T>::value && negative)
x = -x;
}
/// Выводит размеры разжатых и сжатых блоков для сжатого файла.
void stat(DB::ReadBuffer & in, DB::WriteBuffer & out)
{
while (!in.eof())
{
char header[COMPRESSED_BLOCK_HEADER_SIZE];
in.ignore(16); /// checksum
in.readStrict(header, COMPRESSED_BLOCK_HEADER_SIZE);
size_t size_compressed = 0;
memcpy(&size_compressed, &header[1], 4); /// little endian
if (size_compressed > DBMS_MAX_COMPRESSED_SIZE)
throw DB::Exception("Too large size_compressed. Most likely corrupted data.", DB::ErrorCodes::TOO_LARGE_SIZE_COMPRESSED);
size_t size_decompressed = 0;
memcpy(&size_compressed, &header[5], 4); /// little endian
DB::writeText(size_decompressed, out);
DB::writeChar('\t', out);
DB::writeText(size_compressed, out);
DB::writeChar('\n', out);
in.ignore(size_compressed - COMPRESSED_BLOCK_HEADER_SIZE);
}
}
/// Read and check header of compressed block. Print size of decompressed and compressed data.
std::pair<UInt32, UInt32> stat(DB::ReadBuffer & in, DB::WriteBuffer & out)
{
if (in.eof())
return {};
in.ignore(16); /// checksum
char header[COMPRESSED_BLOCK_HEADER_SIZE];
in.readStrict(header, COMPRESSED_BLOCK_HEADER_SIZE);
UInt32 size_compressed = unalignedLoad<UInt32>(&header[1]);
if (size_compressed > DBMS_MAX_COMPRESSED_SIZE)
throw DB::Exception("Too large size_compressed. Most likely corrupted data.", DB::ErrorCodes::TOO_LARGE_SIZE_COMPRESSED);
UInt32 size_decompressed = unalignedLoad<UInt32>(&header[5]);
return {size_compressed, size_decompressed};
}
/// Outputs sizes of uncompressed and compressed blocks for compressed file.
void stat(DB::ReadBuffer & in, DB::WriteBuffer & out)
{
while (!in.eof())
{
in.ignore(16); /// checksum
char header[COMPRESSED_BLOCK_HEADER_SIZE];
in.readStrict(header, COMPRESSED_BLOCK_HEADER_SIZE);
UInt32 size_compressed = unalignedLoad<UInt32>(&header[1]);
if (size_compressed > DBMS_MAX_COMPRESSED_SIZE)
throw DB::Exception("Too large size_compressed. Most likely corrupted data.", DB::ErrorCodes::TOO_LARGE_SIZE_COMPRESSED);
UInt32 size_decompressed = unalignedLoad<UInt32>(&header[5]);
DB::writeText(size_decompressed, out);
DB::writeChar('\t', out);
DB::writeText(size_compressed, out);
DB::writeChar('\n', out);
in.ignore(size_compressed - COMPRESSED_BLOCK_HEADER_SIZE);
}
}