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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 "common.h"
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <stdio.h>
#include <errno.h>
static int append_block(int fd, const sqfs_block_t *blk)
{
const unsigned char *ptr = blk->data;
size_t size = blk->size;
ssize_t ret;
while (size > 0) {
ret = write(fd, ptr, size);
if (ret < 0) {
if (errno == EINTR)
continue;
perror("writing data block");
}
if (ret == 0) {
fputs("writing data block: unexpected end of file\n",
stderr);
}
ptr += ret;
size -= ret;
}
return 0;
}
int sqfs_data_reader_dump(const char *name, sqfs_data_reader_t *data,
const sqfs_inode_generic_t *inode,
int outfd, size_t block_size, bool allow_sparse)
{
sqfs_block_t *blk;
sqfs_u64 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) {
sqfs_perror(name, "reading data block", err);
return -1;
}
if (append_block(outfd, blk)) {
free(blk);
return -1;
}
filesz -= blk->size;
free(blk);
}
}
if (filesz > 0) {
err = sqfs_data_reader_get_fragment(data, inode, &blk);
if (err) {
sqfs_perror(name, "reading fragment block", err);
return -1;
}
if (append_block(outfd, blk)) {
free(blk);
return -1;
}
free(blk);
}
return 0;
fail_sparse:
perror("creating sparse output file");
return -1;
}
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