dbutils/field.h

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2024 Olaf Wintermann. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *
 *   2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef DBU_FIELD_H
#define DBU_FIELD_H

#include "dbutils/dbutils.h"

#ifdef __cplusplus
extern "C" {
#endif

union DBUDefValue {
    int64_t def;
    uint64_t udef;
    float fdef;
    double ddef;
};
    
/*
 * used in most cases, when there is exactly one struct member
 */
typedef struct DBUOffsetField {
    DBUField field;
    off_t offset;
    union DBUDefValue def;
} DBUOffsetField;

/*
 * fields with 2 struct members: a obj pointer and length 
 */
typedef struct DBUObjLenField {
    DBUField field;
    off_t offset_obj;
    off_t offset_len;
} DBUObjLenField;


DBUField* dbuFieldCreateInt32(off_t offset);

DBUField* dbuFieldCreateUInt32(off_t offset);

DBUField* dbuFieldCreateInt64(off_t offset);

DBUField* dbuFieldCreateUInt64(off_t offset);

DBUField* dbuFieldCreateString(off_t offset);

DBUField* dbuFieldCreateCxMutStr(off_t offset);


#ifdef __cplusplus
}
#endif

#endif /* DBU_FIELD_H */