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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* read_sparse_map_old.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "config.h"
#include "internal.h"
sparse_map_t *read_gnu_old_sparse(istream_t *fp, tar_header_t *hdr)
{
sparse_map_t *list = NULL, *end = NULL, *node;
gnu_sparse_t sph;
sqfs_u64 off, sz;
int i, ret;
for (i = 0; i < 4; ++i) {
if (!isdigit(hdr->tail.gnu.sparse[i].offset[0]))
break;
if (!isdigit(hdr->tail.gnu.sparse[i].numbytes[0]))
break;
if (read_octal(hdr->tail.gnu.sparse[i].offset,
sizeof(hdr->tail.gnu.sparse[i].offset), &off))
goto fail;
if (read_octal(hdr->tail.gnu.sparse[i].numbytes,
sizeof(hdr->tail.gnu.sparse[i].numbytes), &sz))
goto fail;
node = calloc(1, sizeof(*node));
if (node == NULL)
goto fail_errno;
node->offset = off;
node->count = sz;
if (list == NULL) {
list = end = node;
} else {
end->next = node;
end = node;
}
}
if (hdr->tail.gnu.isextended == 0)
return list;
do {
ret = istream_read(fp, &sph, sizeof(sph));
if (ret < 0)
goto fail;
if ((size_t)ret < sizeof(sph)) {
fputs("reading GNU sparse header: "
"unexpected end-of-file\n",
stderr);
goto fail;
}
for (i = 0; i < 21; ++i) {
if (!isdigit(sph.sparse[i].offset[0]))
break;
if (!isdigit(sph.sparse[i].numbytes[0]))
break;
if (read_octal(sph.sparse[i].offset,
sizeof(sph.sparse[i].offset), &off))
goto fail;
if (read_octal(sph.sparse[i].numbytes,
sizeof(sph.sparse[i].numbytes), &sz))
goto fail;
node = calloc(1, sizeof(*node));
if (node == NULL)
goto fail_errno;
node->offset = off;
node->count = sz;
if (list == NULL) {
list = end = node;
} else {
end->next = node;
end = node;
}
}
} while (sph.isextended != 0);
return list;
fail_errno:
perror("parsing GNU sparse header");
goto fail;
fail:
free_sparse_list(list);
return NULL;
}
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