guththila/include/guththila_reader.h

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#ifndef GUTHTHILA_READER_H
#define GUTHTHILA_READER_H

#include <stdio.h>
#include <guththila_defines.h>
#include <axutil_utils.h>
EXTERN_C_START()  typedef int(
    GUTHTHILA_CALL * GUTHTHILA_READ_INPUT_CALLBACK)(
        guththila_char_t *buffer,
        int size,
        void *ctx);
enum guththila_reader_type
{
    GUTHTHILA_FILE_READER =
        1, GUTHTHILA_IO_READER, GUTHTHILA_MEMORY_READER
};
typedef struct guththila_reader_s
{
    int
    type;

    FILE *
    fp;
    guththila_char_t *
    buff;
    int
    buff_size;

    GUTHTHILA_READ_INPUT_CALLBACK
    input_read_callback;
    void *
    context;
    
}
guththila_reader_t;

#ifndef GUTHTHILA_READER_SET_LAST_START
#define GUTHTHILA_READER_SET_LAST_START(_reader, _start) ((_reader)->start = _start)
#endif  /*  */

#ifndef GUTHTHILA_READER_STEP_BACK
#define GUTHTHILA_READER_STEP_BACK(_reader) ((_reader->next--))
#endif  /*  */
GUTHTHILA_EXPORT guththila_reader_t * GUTHTHILA_CALL
guththila_reader_create_for_file(guththila_char_t *filename,
        const axutil_env_t * env);
GUTHTHILA_EXPORT guththila_reader_t * GUTHTHILA_CALL
guththila_reader_create_for_io(GUTHTHILA_READ_INPUT_CALLBACK
        input_read_callback, void *ctx,
        const axutil_env_t * env);
GUTHTHILA_EXPORT guththila_reader_t * GUTHTHILA_CALL
guththila_reader_create_for_memory(void *buffer,
        int size,
        const axutil_env_t * env);
GUTHTHILA_EXPORT int GUTHTHILA_CALL  guththila_reader_read(
    guththila_reader_t * r,
    guththila_char_t * buffer,
    int offset,
    int length,
    const axutil_env_t * env);
GUTHTHILA_EXPORT void GUTHTHILA_CALL  guththila_reader_free(
    guththila_reader_t * r,
    const axutil_env_t * env);
EXTERN_C_END() 
#endif  /*  */