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/*
* dump2tar - tool to dump files and command output into a tar archive
*
* Data buffering functions
*
* Copyright IBM Corp. 2016, 2017
*
* s390-tools is free software; you can redistribute it and/or modify
* it under the terms of the MIT license. See LICENSE for details.
*/
#ifndef BUFFER_H
#define BUFFER_H
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
/* Buffers for building tar file entries */
struct buffer {
size_t total; /* Total number of bytes in buffer */
size_t off; /* Current offset to next free byte in memory buffer */
size_t size; /* Memory buffer size */
char *addr; /* Memory buffer address */
bool fd_open; /* Has fd been openend yet? */
FILE *file; /* FILE * of file containing previous buffer data */
int fd; /* Handle of file containing previous buffer data */
};
void buffer_init(struct buffer *buffer, size_t size);
struct buffer *buffer_alloc(size_t size);
void buffer_reset(struct buffer *buffer);
void buffer_close(struct buffer *buffer);
void buffer_free(struct buffer *buffer, bool dyn);
int buffer_open(struct buffer *buffer);
int buffer_flush(struct buffer *buffer);
ssize_t buffer_make_room(struct buffer *buffer, size_t size, bool usefile,
size_t max_buffer_size);
int buffer_truncate(struct buffer *buffer, size_t len);
ssize_t buffer_read_fd(struct buffer *buffer, int fd, size_t chunk,
bool usefile, size_t max_buffer_size);
int buffer_add_data(struct buffer *buffer, char *addr, size_t len,
bool usefile, size_t max_buffer_size);
typedef int (*buffer_cb_t)(void *data, void *addr, size_t len);
int buffer_iterate(struct buffer *buffer, buffer_cb_t cb, void *data);
void buffer_print(struct buffer *buffer);
#endif /* BUFFER_H */
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