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/*
* 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; /* Type of reader */
FILE *fp; /* File pointer */
guththila_char_t *buff; /* Buffer */
int buff_size; /* Buff size */
GUTHTHILA_READ_INPUT_CALLBACK input_read_callback; /* Call back */
void *context; /* 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
/*
* Reading a file.
* @param filename name of the file
* @param env environment
*/
GUTHTHILA_EXPORT guththila_reader_t * GUTHTHILA_CALL
guththila_reader_create_for_file(
guththila_char_t *filename,
const axutil_env_t * env);
/*
* Reading from a call back function.
* @param input_read_callback function pointer to read data
* @param ctx context
* @param env environment
*/
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);
/*
* Reading from memory buffer.
* @param buffer buffer
* @param size size of the buffer
* @param env environment
*/
GUTHTHILA_EXPORT guththila_reader_t * GUTHTHILA_CALL
guththila_reader_create_for_memory(
void *buffer,
int size,
const axutil_env_t * env);
/*
* Read the specified number of character to the given buffer.
* @param r reader
* @param buffer buffer to place the read data
* @param offset position to place the data on the given buffer
* @param length number of bytes to read
* @param env environment
* @return number of bytes put in to the buffer. -1 if end of the read.
*/
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);
/*
* Free the reader.
* @param r reader
* @param env environment
*/
GUTHTHILA_EXPORT void GUTHTHILA_CALL
guththila_reader_free(
guththila_reader_t * r,
const axutil_env_t * env);
EXTERN_C_END()
#endif /* */
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