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/*
* Copyright (C) 2012 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.
*/
#include <stdlib.h>
#include <sparse/sparse.h>
#include "sparse_file.h"
#include "output_file.h"
#include "backed_block.h"
#include "sparse_defs.h"
struct sparse_file *sparse_file_new(unsigned int block_size, int64_t len)
{
struct sparse_file *s = calloc(sizeof(struct sparse_file), 1);
if (!s) {
return NULL;
}
s->backed_block_list = backed_block_list_new();
if (!s->backed_block_list) {
free(s);
return NULL;
}
s->block_size = block_size;
s->len = len;
return s;
}
void sparse_file_destroy(struct sparse_file *s)
{
backed_block_list_destroy(s->backed_block_list);
free(s);
}
int sparse_file_add_data(struct sparse_file *s,
void *data, unsigned int len, unsigned int block)
{
queue_data_block(s->backed_block_list, data, len, block);
return 0;
}
int sparse_file_add_fill(struct sparse_file *s,
uint32_t fill_val, unsigned int len, unsigned int block)
{
queue_fill_block(s->backed_block_list, fill_val, len, block);
return 0;
}
int sparse_file_add_file(struct sparse_file *s,
const char *filename, int64_t file_offset, unsigned int len,
unsigned int block)
{
queue_data_file(s->backed_block_list, filename, file_offset, len, block);
return 0;
}
struct count_chunks {
unsigned int chunks;
int64_t cur_ptr;
unsigned int block_size;
};
static void count_data_block(void *priv, int64_t off, void *data, int len)
{
struct count_chunks *count_chunks = priv;
if (off > count_chunks->cur_ptr)
count_chunks->chunks++;
count_chunks->cur_ptr = off + ALIGN(len, count_chunks->block_size);
count_chunks->chunks++;
}
static void count_fill_block(void *priv, int64_t off, unsigned int fill_val, int len)
{
struct count_chunks *count_chunks = priv;
if (off > count_chunks->cur_ptr)
count_chunks->chunks++;
count_chunks->cur_ptr = off + ALIGN(len, count_chunks->block_size);
count_chunks->chunks++;
}
static void count_file_block(void *priv, int64_t off, const char *file,
int64_t offset, int len)
{
struct count_chunks *count_chunks = priv;
if (off > count_chunks->cur_ptr)
count_chunks->chunks++;
count_chunks->cur_ptr = off + ALIGN(len, count_chunks->block_size);
count_chunks->chunks++;
}
static int count_sparse_chunks(struct backed_block_list *b,
unsigned int block_size, int64_t len)
{
struct count_chunks count_chunks = {0, 0, block_size};
for_each_data_block(b, count_data_block, count_file_block,
count_fill_block, &count_chunks, block_size);
if (count_chunks.cur_ptr != len)
count_chunks.chunks++;
return count_chunks.chunks;
}
static void ext4_write_data_block(void *priv, int64_t off, void *data, int len)
{
write_data_block(priv, off, data, len);
}
static void ext4_write_fill_block(void *priv, int64_t off, unsigned int fill_val, int len)
{
write_fill_block(priv, off, fill_val, len);
}
static void ext4_write_data_file(void *priv, int64_t off, const char *file,
int64_t offset, int len)
{
write_data_file(priv, off, file, offset, len);
}
int sparse_file_write(struct sparse_file *s, int fd, bool gz, bool sparse,
bool crc)
{
int chunks = count_sparse_chunks(s->backed_block_list, s->block_size,
s->len);
struct output_file *out = open_output_fd(fd, s->block_size, s->len,
gz, sparse, chunks, crc);
if (!out)
return -ENOMEM;
for_each_data_block(s->backed_block_list, ext4_write_data_block,
ext4_write_data_file, ext4_write_fill_block, out, s->block_size);
if (s->len)
pad_output_file(out, s->len);
close_output_file(out);
return 0;
}
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