/*
 * Copyright (C) 2010 The Android Open Source Project
 *
 * Licensed 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 _BACKED_BLOCK_H_
#define _BACKED_BLOCK_H_

#include <stdint.h>

struct backed_block_list;
struct backed_block;

enum backed_block_type {
  BACKED_BLOCK_DATA,
  BACKED_BLOCK_FILE,
  BACKED_BLOCK_FD,
  BACKED_BLOCK_FILL,
};

int backed_block_add_data(struct backed_block_list* bbl, void* data, unsigned int len,
                          unsigned int block);
int backed_block_add_fill(struct backed_block_list* bbl, unsigned int fill_val, unsigned int len,
                          unsigned int block);
int backed_block_add_file(struct backed_block_list* bbl, const char* filename, int64_t offset,
                          unsigned int len, unsigned int block);
int backed_block_add_fd(struct backed_block_list* bbl, int fd, int64_t offset, unsigned int len,
                        unsigned int block);

struct backed_block* backed_block_iter_new(struct backed_block_list* bbl);
struct backed_block* backed_block_iter_next(struct backed_block* bb);
unsigned int backed_block_len(struct backed_block* bb);
unsigned int backed_block_block(struct backed_block* bb);
void* backed_block_data(struct backed_block* bb);
const char* backed_block_filename(struct backed_block* bb);
int backed_block_fd(struct backed_block* bb);
int64_t backed_block_file_offset(struct backed_block* bb);
uint32_t backed_block_fill_val(struct backed_block* bb);
enum backed_block_type backed_block_type(struct backed_block* bb);
int backed_block_split(struct backed_block_list* bbl, struct backed_block* bb, unsigned int max_len);

struct backed_block* backed_block_iter_new(struct backed_block_list* bbl);
struct backed_block* backed_block_iter_next(struct backed_block* bb);

struct backed_block_list* backed_block_list_new(unsigned int block_size);
void backed_block_list_destroy(struct backed_block_list* bbl);

void backed_block_list_move(struct backed_block_list* from, struct backed_block_list* to,
                            struct backed_block* start, struct backed_block* end);

#endif