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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"
#include <ctype.h>
#include <stdlib.h>
static int parse(const gnu_old_sparse_t *in, size_t count,
sparse_map_t **head, sparse_map_t **tail)
{
sparse_map_t *node;
sqfs_u64 off, sz;
while (count--) {
if (!isdigit(in->offset[0]) || !isdigit(in->numbytes[0]))
return 1;
if (read_number(in->offset, sizeof(in->offset), &off))
return -1;
if (read_number(in->numbytes, sizeof(in->numbytes), &sz))
return -1;
++in;
node = calloc(1, sizeof(*node));
if (node == NULL) {
perror("parsing GNU sparse header");
return -1;
}
node->offset = off;
node->count = sz;
if ((*head) == NULL) {
(*head) = (*tail) = node;
} else {
(*tail)->next = node;
(*tail) = node;
}
}
return 0;
}
sparse_map_t *read_gnu_old_sparse(sqfs_istream_t *fp, tar_header_t *hdr)
{
sparse_map_t *list = NULL, *end = NULL;
gnu_old_sparse_record_t sph;
int ret;
ret = parse(hdr->tail.gnu.sparse, 4, &list, &end);
if (ret < 0)
goto fail;
if (ret > 0 || hdr->tail.gnu.isextended == 0)
return list;
do {
ret = sqfs_istream_read(fp, &sph, sizeof(sph));
if (ret < 0) {
sqfs_perror(fp->get_filename(fp),
"reading old GNU sparse list", ret);
goto fail;
}
if ((size_t)ret < sizeof(sph))
goto fail_eof;
ret = parse(sph.sparse, 21, &list, &end);
if (ret < 0)
goto fail;
} while (ret == 0 && sph.isextended != 0);
return list;
fail_eof:
fputs("reading GNU sparse header: unexpected end-of-file\n", stderr);
fail:
free_sparse_list(list);
return NULL;
}
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