diff options
Diffstat (limited to 'libarchive/archive_read_disk_entry_from_file.c')
| -rw-r--r-- | libarchive/archive_read_disk_entry_from_file.c | 30 |
1 files changed, 25 insertions, 5 deletions
diff --git a/libarchive/archive_read_disk_entry_from_file.c b/libarchive/archive_read_disk_entry_from_file.c index 38303aa..74fe353 100644 --- a/libarchive/archive_read_disk_entry_from_file.c +++ b/libarchive/archive_read_disk_entry_from_file.c @@ -1046,7 +1046,7 @@ setup_sparse(struct archive_read_disk *a, struct fiemap *fm; struct fiemap_extent *fe; int64_t size; - int count, do_fiemap; + int count, do_fiemap, iters; int exit_sts = ARCHIVE_OK; if (archive_entry_filetype(entry) != AE_IFREG @@ -1083,7 +1083,7 @@ setup_sparse(struct archive_read_disk *a, fm->fm_extent_count = count; do_fiemap = 1; size = archive_entry_size(entry); - for (;;) { + for (iters = 0; ; ++iters) { int i, r; r = ioctl(*fd, FS_IOC_FIEMAP, fm); @@ -1093,8 +1093,13 @@ setup_sparse(struct archive_read_disk *a, * version(<2.6.28) cannot perfom FS_IOC_FIEMAP. */ goto exit_setup_sparse; } - if (fm->fm_mapped_extents == 0) + if (fm->fm_mapped_extents == 0) { + if (iters == 0) { + /* Fully sparse file; insert a zero-length "data" entry */ + archive_entry_sparse_add_entry(entry, 0, 0); + } break; + } fe = fm->fm_extents; for (i = 0; i < (int)fm->fm_mapped_extents; i++, fe++) { if (!(fe->fe_flags & FIEMAP_EXTENT_UNWRITTEN)) { @@ -1139,6 +1144,7 @@ setup_sparse(struct archive_read_disk *a, off_t initial_off; /* FreeBSD/Solaris only, so off_t okay here */ off_t off_s, off_e; /* FreeBSD/Solaris only, so off_t okay here */ int exit_sts = ARCHIVE_OK; + int check_fully_sparse = 0; if (archive_entry_filetype(entry) != AE_IFREG || archive_entry_size(entry) <= 0 @@ -1191,8 +1197,14 @@ setup_sparse(struct archive_read_disk *a, while (off_s < size) { off_s = lseek(*fd, off_s, SEEK_DATA); if (off_s == (off_t)-1) { - if (errno == ENXIO) - break;/* no more hole */ + if (errno == ENXIO) { + /* no more hole */ + if (archive_entry_sparse_count(entry) == 0) { + /* Potentially a fully-sparse file. */ + check_fully_sparse = 1; + } + break; + } archive_set_error(&a->archive, errno, "lseek(SEEK_HOLE) failed"); exit_sts = ARCHIVE_FAILED; @@ -1216,6 +1228,14 @@ setup_sparse(struct archive_read_disk *a, off_e - off_s); off_s = off_e; } + + if (check_fully_sparse) { + if (lseek(*fd, 0, SEEK_HOLE) == 0 && + lseek(*fd, 0, SEEK_END) == size) { + /* Fully sparse file; insert a zero-length "data" entry */ + archive_entry_sparse_add_entry(entry, 0, 0); + } + } exit_setup_sparse: lseek(*fd, initial_off, SEEK_SET); return (exit_sts); |