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src/sql/engine/expr/ob_expr_des_hex_str.cpp

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+/**
+ * Copyright (c) 2021 OceanBase
+ * OceanBase CE is licensed under Mulan PubL v2.
+ * You can use this software according to the terms and conditions of the Mulan PubL v2.
+ * You may obtain a copy of Mulan PubL v2 at:
+ *          http://license.coscl.org.cn/MulanPubL-2.0
+ * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
+ * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
+ * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+ * See the Mulan PubL v2 for more details.
+ */
+
+#define USING_LOG_PREFIX SQL_ENG
+
+#include "sql/engine/expr/ob_expr_des_hex_str.h"
+#include "sql/engine/expr/ob_expr_result_type_util.h"
+#include "sql/session/ob_sql_session_info.h"
+
+namespace oceanbase {
+using namespace oceanbase::common;
+namespace sql {
+ObExprDesHexStr::ObExprDesHexStr(ObIAllocator& alloc)
+    : ObFuncExprOperator(alloc, T_FUN_DES_HEX_STR, N_DES_HEX_STR, 1, NOT_ROW_DIMENSION)
+{}
+
+int ObExprDesHexStr::calc_result_type1(ObExprResType& type, ObExprResType& type1, common::ObExprTypeCtx& type_ctx) const
+{
+  UNUSED(type_ctx);
+  int ret = common::OB_SUCCESS;
+
+  if (!type1.is_varchar()) {
+    ret = common::OB_INVALID_ARGUMENT;
+    LOG_WARN("invalid type1 argument.", K(ret), K(type1));
+  } else {
+    type.set_varchar();
+    type.set_collation_level(type1.get_collation_level());
+    type.set_collation_type(type1.get_collation_type());
+    type.set_scale(type1.get_scale());
+  }
+
+  return ret;
+}
+
+int ObExprDesHexStr::calc_result1(common::ObObj& result, const common::ObObj& obj, common::ObExprCtx& expr_ctx) const
+{
+  int ret = common::OB_SUCCESS;
+  ObString obj_string;
+
+  if (!obj.is_valid_type() || OB_ISNULL(expr_ctx.calc_buf_)) {
+    ret = common::OB_INVALID_ARGUMENT;
+    LOG_WARN("invalid argument.", K(ret), K(obj.is_valid_type()), KP(expr_ctx.calc_buf_));
+  } else {
+    obj_string = obj.get_varchar();
+    if (OB_FAIL(deserialize_hex_cstr(obj_string.ptr(), obj_string.length(), *expr_ctx.calc_buf_, result))) {
+      LOG_WARN("deserialize_hex_cstr obj_string failed.", K(ret));
+    }
+  }
+
+  return ret;
+}
+
+int ObExprDesHexStr::deserialize_hex_cstr(
+    const char* buf, int64_t buf_len, common::ObExprStringBuf& string_buf, common::ObObj& obj)
+{
+  int ret = common::OB_SUCCESS;
+
+  int64_t pos = 0;
+  int64_t ret_len = 0;
+  char* res_buf = NULL;
+  if (OB_ISNULL(buf) || buf_len < 0) {
+    ret = OB_INVALID_ARGUMENT;
+    LOG_WARN("invalid arguments.", K(ret), K(buf_len));
+  } else if (NULL == (res_buf = static_cast<char*>(string_buf.alloc(buf_len)))) {
+    ret = OB_ALLOCATE_MEMORY_FAILED;
+    LOG_ERROR("fail to allocate memory for res_buf.", K(ret), K(buf_len));
+  } else if (buf_len != (ret_len = common::str_to_hex(
+                             buf, static_cast<int32_t>(buf_len), res_buf, static_cast<int32_t>(buf_len)))) {
+    ret = OB_ERR_UNEXPECTED;
+    LOG_WARN("transfer str to hex failed.", K(ret), K(buf), K(buf_len), K(ret_len));
+  } else if (OB_FAIL(obj.deserialize(res_buf, ret_len / 2, pos))) {
+    LOG_WARN("deserialize obj failed.", K(ret), K(buf), K(buf_len), K(pos));
+  }
+
+  return ret;
+}
+
+int ObExprDesHexStr::cg_expr(ObExprCGCtx&, const ObRawExpr&, ObExpr& expr) const
+{
+  int ret = OB_SUCCESS;
+  CK(1 == expr.arg_cnt_);
+  expr.eval_func_ = eval_des_hex_str;
+  return ret;
+}
+
+int ObExprDesHexStr::eval_des_hex_str(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum)
+{
+  int ret = OB_SUCCESS;
+  ObDatum* in = NULL;
+  ObIAllocator& alloc = ctx.get_reset_tmp_alloc();
+  ObObj obj;
+  if (OB_FAIL(expr.eval_param_value(ctx, in))) {
+    LOG_WARN("evaluate parameter failed", K(ret));
+  } else if (in->is_null()) {
+    expr_datum.set_null();
+  } else if (OB_FAIL(deserialize_hex_cstr(in->ptr_, in->len_, alloc, obj))) {
+    LOG_WARN("unhex or deserialize failed", K(ret));
+  } else {
+    const int64_t len = std::max(128, in->len_ * 2);
+    char* buf = expr.get_str_res_mem(ctx, len);
+    int64_t pos = 0;
+    if (OB_ISNULL(buf)) {
+      ret = OB_ALLOCATE_MEMORY_FAILED;
+      LOG_WARN("allocate memory failed", K(ret));
+    } else if (OB_FAIL(obj.print_plain_str_literal(buf, len, pos))) {
+      LOG_WARN("print sql literal failed", K(ret), K(obj));
+    } else {
+      expr_datum.set_string(buf, pos);
+    }
+  }
+  return ret;
+}
+
+}  // namespace sql
+}  // namespace oceanbase