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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* data_reader_dump.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "config.h"
#include "sqfs/data_writer.h"
#include "sqfs/data_reader.h"
#include "highlevel.h"
#include "util.h"
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <stdio.h>
int sqfs_data_reader_dump(sqfs_data_reader_t *data,
const sqfs_inode_generic_t *inode,
int outfd, size_t block_size, bool allow_sparse)
{
sqfs_block_t *blk;
uint64_t filesz;
size_t i, diff;
int err;
sqfs_inode_get_file_size(inode, &filesz);
if (allow_sparse && ftruncate(outfd, filesz))
goto fail_sparse;
for (i = 0; i < inode->num_file_blocks; ++i) {
if (SQFS_IS_SPARSE_BLOCK(inode->block_sizes[i]) &&
allow_sparse) {
if (filesz < block_size) {
diff = filesz;
filesz = 0;
} else {
diff = block_size;
filesz -= block_size;
}
if (lseek(outfd, diff, SEEK_CUR) == (off_t)-1)
goto fail_sparse;
} else {
err = sqfs_data_reader_get_block(data, inode, i, &blk);
if (err) {
fprintf(stderr, "error reading "
"data block: %d\n", err);
return -1;
}
if (write_data("writing uncompressed block",
outfd, blk->data, blk->size)) {
free(blk);
return -1;
}
filesz -= blk->size;
free(blk);
}
}
if (filesz > 0) {
if (sqfs_data_reader_get_fragment(data, inode, &blk)) {
fputs("error reading fragment block", stderr);
return -1;
}
if (write_data("writing uncompressed fragment", outfd,
blk->data, blk->size)) {
free(blk);
return -1;
}
free(blk);
}
return 0;
fail_sparse:
perror("creating sparse output file");
return -1;
}
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