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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 <assert.h>
#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)
{
return backed_block_add_data(s->backed_block_list, data, len, block);
}
int sparse_file_add_fill(struct sparse_file *s,
uint32_t fill_val, unsigned int len, unsigned int block)
{
return backed_block_add_fill(s->backed_block_list, fill_val, len, block);
}
int sparse_file_add_file(struct sparse_file *s,
const char *filename, int64_t file_offset, unsigned int len,
unsigned int block)
{
return backed_block_add_file(s->backed_block_list, filename, file_offset,
len, block);
}
int sparse_file_add_fd(struct sparse_file *s,
int fd, int64_t file_offset, unsigned int len, unsigned int block)
{
return backed_block_add_fd(s->backed_block_list, fd, file_offset,
len, block);
}
unsigned int sparse_count_chunks(struct sparse_file *s)
{
struct backed_block *bb;
unsigned int last_block = 0;
unsigned int chunks = 0;
for (bb = backed_block_iter_new(s->backed_block_list); bb;
bb = backed_block_iter_next(bb)) {
if (backed_block_block(bb) > last_block) {
/* If there is a gap between chunks, add a skip chunk */
chunks++;
}
chunks++;
last_block = backed_block_block(bb) +
DIV_ROUND_UP(backed_block_len(bb), s->block_size);
}
if (last_block < DIV_ROUND_UP(s->len, s->block_size)) {
chunks++;
}
return chunks;
}
int sparse_file_write(struct sparse_file *s, int fd, bool gz, bool sparse,
bool crc)
{
struct backed_block *bb;
unsigned int last_block = 0;
int64_t pad;
int chunks;
struct output_file *out;
chunks = sparse_count_chunks(s);
out = open_output_fd(fd, s->block_size, s->len, gz, sparse, chunks, crc);
if (!out)
return -ENOMEM;
for (bb = backed_block_iter_new(s->backed_block_list); bb;
bb = backed_block_iter_next(bb)) {
if (backed_block_block(bb) > last_block) {
unsigned int blocks = backed_block_block(bb) - last_block;
write_skip_chunk(out, (int64_t)blocks * s->block_size);
}
switch (backed_block_type(bb)) {
case BACKED_BLOCK_DATA:
write_data_chunk(out, backed_block_len(bb), backed_block_data(bb));
break;
case BACKED_BLOCK_FILE:
write_file_chunk(out, backed_block_len(bb),
backed_block_filename(bb), backed_block_file_offset(bb));
break;
case BACKED_BLOCK_FD:
write_fd_chunk(out, backed_block_len(bb),
backed_block_fd(bb), backed_block_file_offset(bb));
break;
case BACKED_BLOCK_FILL:
write_fill_chunk(out, backed_block_len(bb),
backed_block_fill_val(bb));
break;
}
last_block = backed_block_block(bb) +
DIV_ROUND_UP(backed_block_len(bb), s->block_size);
}
pad = s->len - last_block * s->block_size;
assert(pad >= 0);
if (pad > 0) {
write_skip_chunk(out, pad);
}
close_output_file(out);
return 0;
}
void sparse_file_verbose(struct sparse_file *s)
{
s->verbose = true;
}
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