66 lines
2.4 KiB
C++
66 lines
2.4 KiB
C++
/**
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* Copyright (c) 2021 OceanBase
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* OceanBase CE is licensed under Mulan PubL v2.
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* You can use this software according to the terms and conditions of the Mulan PubL v2.
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* You may obtain a copy of Mulan PubL v2 at:
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* http://license.coscl.org.cn/MulanPubL-2.0
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* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
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* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
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* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
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* See the Mulan PubL v2 for more details.
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*/
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#ifndef OCEANBASE_SQL_ENGINE_OB_EXPR_TO_BASE64_
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#define OCEANBASE_SQL_ENGINE_OB_EXPR_TO_BASE64_
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#include "sql/engine/expr/ob_expr_operator.h"
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#include "share/object/ob_obj_cast.h"
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namespace oceanbase
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{
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namespace sql
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{
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class ObExprToBase64 : public ObFuncExprOperator
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{
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public:
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explicit ObExprToBase64(common::ObIAllocator &alloc);
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virtual ~ObExprToBase64();
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virtual int calc_result_type1(ObExprResType &type,
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ObExprResType &str,
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common::ObExprTypeCtx &type_ctx) const;
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virtual int cg_expr(ObExprCGCtx &expr_cg_ctx,
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const ObRawExpr &raw_expr,
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ObExpr &rt_expr) const;
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static int eval_to_base64(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &res);
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static int eval_to_base64_batch(const ObExpr &expr,
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ObEvalCtx &ctx,
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const ObBitVector &skip,
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const int64_t batch_size);
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private:
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DISALLOW_COPY_AND_ASSIGN(ObExprToBase64);
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static int calc(common::ObObj &result,
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const common::ObObj &obj1,
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common::ObIAllocator *allocator);
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static const int64_t NCHAR_PER_BASE64 = 4;
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static const int64_t NCHAR_PER_BASE64_GROUP = 3;
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static const int64_t NCHAR_PER_STR_PAD = 2;
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static const int64_t NUM_OF_CHAR_PER_LINE_QUOTED_PRINTABLE = 76;
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static inline ObLength base64_needed_encoded_length(ObLength length_of_data)
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{
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ObLength nb_base64_chars;
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if (length_of_data == 0) {
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return 0;
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}
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nb_base64_chars = (length_of_data + NCHAR_PER_STR_PAD) / NCHAR_PER_BASE64_GROUP * NCHAR_PER_BASE64;
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return nb_base64_chars + /* base64 char incl padding */
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(nb_base64_chars - 1) / 76 + /* newlines */
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1; /* NUL termination of string */
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}
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};
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}
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}
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#endif //OCEANBASE_SQL_ENGINE_OB_EXPR_TO_BASE64_
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