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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(FILE *fp, const sqfs_block_t *blk)
{
const unsigned char *ptr = blk->data;
size_t ret, size = blk->size;
while (size > 0) {
if (ferror(fp)) {
fputs("writing data block: error writing to file\n",
stderr);
}
if (feof(fp)) {
fputs("writing data block: unexpected end of file\n",
stderr);
}
ret = fwrite(ptr, 1, size, fp);
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,
FILE *fp, 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 defined(_POSIX_VERSION) && (_POSIX_VERSION >= 200112L)
if (allow_sparse) {
int fd = fileno(fp);
if (ftruncate(fd, filesz))
goto fail_sparse;
}
#else
allow_sparse = false;
#endif
for (i = 0; i < inode->num_file_blocks; ++i) {
diff = (filesz < block_size) ? filesz : block_size;
if (SQFS_IS_SPARSE_BLOCK(inode->block_sizes[i]) &&
allow_sparse) {
if (fseek(fp, diff, SEEK_CUR) < 0)
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;
}
err = append_block(fp, blk);
free(blk);
if (err)
return -1;
}
filesz -= diff;
}
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(fp, blk)) {
free(blk);
return -1;
}
free(blk);
}
return 0;
fail_sparse:
perror("creating sparse output file");
return -1;
}
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