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#pragma once
#include "clickhouse_config.h"
#if USE_BASE64
# include <Columns/ColumnFixedString.h>
# include <Columns/ColumnString.h>
# include <DataTypes/DataTypeString.h>
# include <Functions/FunctionHelpers.h>
# include <Functions/IFunction.h>
# include <Interpreters/Context_fwd.h>
# include <turbob64.h>
# include <Common/MemorySanitizer.h>
# include <span>
namespace DB
{
namespace ErrorCodes
{
extern const int BAD_ARGUMENTS;
extern const int ILLEGAL_COLUMN;
extern const int ILLEGAL_TYPE_OF_ARGUMENT;
extern const int INCORRECT_DATA;
}
namespace Detail
{
inline size_t base64Decode(const std::span<const UInt8> src, UInt8 * dst)
{
# if defined(__aarch64__)
return tb64sdec(reinterpret_cast<const uint8_t *>(src.data()), src.size(), reinterpret_cast<uint8_t *>(dst));
# else
return _tb64d(reinterpret_cast<const uint8_t *>(src.data()), src.size(), reinterpret_cast<uint8_t *>(dst));
# endif
}
}
struct Base64Encode
{
static constexpr auto name = "base64Encode";
static size_t getBufferSize(const size_t string_length, const size_t string_count)
{
return ((string_length - string_count) / 3 + string_count) * 4 + string_count;
}
static size_t performCoding(const std::span<const UInt8> src, UInt8 * dst)
{
/*
* Some bug in sse arm64 implementation?
* `base64Encode(repeat('a', 46))` returns wrong padding character
*/
# if defined(__aarch64__)
return tb64senc(reinterpret_cast<const uint8_t *>(src.data()), src.size(), reinterpret_cast<uint8_t *>(dst));
# else
return _tb64e(reinterpret_cast<const uint8_t *>(src.data()), src.size(), reinterpret_cast<uint8_t *>(dst));
# endif
}
};
struct Base64Decode
{
static constexpr auto name = "base64Decode";
static size_t getBufferSize(const size_t string_length, const size_t string_count)
{
return ((string_length - string_count) / 4 + string_count) * 3 + string_count;
}
static size_t performCoding(const std::span<const UInt8> src, UInt8 * dst)
{
const auto outlen = Detail::base64Decode(src, dst);
if (src.size() > 0 && !outlen)
throw Exception(
ErrorCodes::INCORRECT_DATA,
"Failed to {} input '{}'",
name,
String(reinterpret_cast<const char *>(src.data()), src.size()));
return outlen;
}
};
struct TryBase64Decode
{
static constexpr auto name = "tryBase64Decode";
static size_t getBufferSize(const size_t string_length, const size_t string_count)
{
return Base64Decode::getBufferSize(string_length, string_count);
}
static size_t performCoding(const std::span<const UInt8> src, UInt8 * dst)
{
if (src.empty())
return 0;
const auto outlen = Detail::base64Decode(src, dst);
// during decoding character array can be partially polluted
// if fail, revert back and clean
if (!outlen)
*dst = 0;
return outlen;
}
};
template <typename Func>
class FunctionBase64Conversion : public IFunction
{
public:
static constexpr auto name = Func::name;
static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionBase64Conversion>(); }
String getName() const override { return Func::name; }
size_t getNumberOfArguments() const override { return 1; }
bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return true; }
bool useDefaultImplementationForConstants() const override { return true; }
DataTypePtr getReturnTypeImpl(const ColumnsWithTypeAndName & arguments) const override
{
if (arguments.size() != 1)
throw Exception(ErrorCodes::BAD_ARGUMENTS, "Wrong number of arguments for function {}: 1 expected.", getName());
if (!WhichDataType(arguments[0].type).isStringOrFixedString())
throw Exception(
ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT,
"Illegal type {} of 1st argument of function {}. Must be FixedString or String.",
arguments[0].type->getName(),
getName());
return std::make_shared<DataTypeString>();
}
ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, const size_t input_rows_count) const override
{
const auto & input_column = arguments[0].column;
if (const auto * src_column_as_fixed_string = checkAndGetColumn<ColumnFixedString>(*input_column))
return execute(*src_column_as_fixed_string, input_rows_count);
else if (const auto * src_column_as_string = checkAndGetColumn<ColumnString>(*input_column))
return execute(*src_column_as_string, input_rows_count);
throw Exception(
ErrorCodes::ILLEGAL_COLUMN,
"Illegal column {} of first argument of function {}, must be of type FixedString or String.",
input_column->getName(),
getName());
}
private:
static ColumnPtr execute(const ColumnString & src_column, const size_t src_row_count)
{
auto dst_column = ColumnString::create();
auto & dst_chars = dst_column->getChars();
auto & dst_offsets = dst_column->getOffsets();
const auto reserve = Func::getBufferSize(src_column.byteSize(), src_column.size());
dst_chars.resize(reserve);
dst_offsets.resize(src_row_count);
const auto & src_chars = src_column.getChars();
const auto & src_offsets = src_column.getOffsets();
auto * dst = dst_chars.data();
auto * dst_pos = dst;
const auto * src = src_chars.data();
size_t src_offset_prev = 0;
for (size_t row = 0; row < src_row_count; ++row)
{
const size_t src_length = src_offsets[row] - src_offset_prev - 1;
const auto outlen = Func::performCoding({src, src_length}, dst_pos);
/// Base64 library is using AVX-512 with some shuffle operations.
/// Memory sanitizer don't understand if there was uninitialized memory in SIMD register but it was not used in the result of shuffle.
__msan_unpoison(dst_pos, outlen);
src += src_length + 1;
dst_pos += outlen;
*dst_pos = '\0';
dst_pos += 1;
dst_offsets[row] = dst_pos - dst;
src_offset_prev = src_offsets[row];
}
dst_chars.resize(dst_pos - dst);
return dst_column;
}
static ColumnPtr execute(const ColumnFixedString & src_column, const size_t src_row_count)
{
auto dst_column = ColumnString::create();
auto & dst_chars = dst_column->getChars();
auto & dst_offsets = dst_column->getOffsets();
const auto reserve = Func::getBufferSize(src_column.byteSize(), src_column.size());
dst_chars.resize(reserve);
dst_offsets.resize(src_row_count);
const auto & src_chars = src_column.getChars();
const auto & src_n = src_column.getN();
auto * dst = dst_chars.data();
auto * dst_pos = dst;
const auto * src = src_chars.data();
for (size_t row = 0; row < src_row_count; ++row)
{
const auto outlen = Func::performCoding({src, src_n}, dst_pos);
/// Base64 library is using AVX-512 with some shuffle operations.
/// Memory sanitizer don't understand if there was uninitialized memory in SIMD register but it was not used in the result of shuffle.
__msan_unpoison(dst_pos, outlen);
src += src_n;
dst_pos += outlen;
*dst_pos = '\0';
dst_pos += 1;
dst_offsets[row] = dst_pos - dst;
}
dst_chars.resize(dst_pos - dst);
return dst_column;
}
};
}
#endif
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