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src/sql/parser/parser_utility.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.
+ */
+
+#include "sql/parser/parser_utility.h"
+#include "lib/utility/ob_macro_utils.h"
+
+#include <cstddef>
+
+int parser_to_hex_cstr(const void* in_data, const int64_t data_length, char* buff, const int64_t buff_size)
+{
+  int ret = 0;
+  int64_t pos = 0;
+  int64_t cstr_pos = 0;
+  if (0 != (ret = parser_to_hex_cstr_(in_data, data_length, buff, buff_size, &pos, &cstr_pos))) {}
+  return ret;
+}
+
+static const char* HEXCHARS = "0123456789ABCDEF";
+
+int parser_to_hex_cstr_(
+    const void* in_data, const int64_t data_length, char* buf, const int64_t buf_len, int64_t* pos, int64_t* cstr_pos)
+{
+  int ret = 0;
+  *cstr_pos = *pos;
+  if ((OB_UNLIKELY(data_length > 0) && OB_ISNULL(in_data)) || OB_ISNULL(buf) || OB_UNLIKELY(*pos < 0) ||
+      OB_UNLIKELY(buf_len - *pos) < 1) {
+    ret = -1;
+    // LOG_WARN("Invalid argument", KP(in_data), KP(buf), K(data_length), K(buf_len), K(ret));
+  } else if ((buf_len - *pos) < (data_length * 2 + 1)) {
+    buf[*pos++] = '\0';
+    ret = -2;
+    // LOG_WARN("size is overflow", K(buf_len), K(data_length), K(buf_len), K(pos), K(ret));
+  } else {
+    unsigned const char* p = (unsigned const char*)in_data;
+    char* dst = static_cast<char*>(buf + *pos);
+    for (int64_t i = 0; i < data_length; ++i) {
+      *dst++ = HEXCHARS[*p >> 4 & 0xF];
+      *dst++ = HEXCHARS[*p & 0xF];
+      p++;
+    }
+    *dst = '\0';
+    *pos += (data_length * 2 + 1);
+  }
+  return ret;
+}