Add 32-bit size teset only when needed - libcdio.git - libcdio

diff --git a/lib/iso9660/iso9660_fs.c b/lib/iso9660/iso9660_fs.c
index 2374d463..7ff6c73b 100644
--- a/lib/iso9660/iso9660_fs.c
+++ b/lib/iso9660/iso9660_fs.c

@@ -1514,6 +1514,7 @@ iso9660_fs_readdir (CdIo_t *p_cdio, const char psz_path[])

return NULL;

}

+#if (SIZE_MAX / 2048) < UINT32_MAX

/* Check for overflow on 32-bit systems.

uint32_t has a limited maximum value, and if p_stat->total_size (the total

size of the directory) is very large, the calculation might exceed this limit.

@@ -1523,16 +1524,20 @@ iso9660_fs_readdir (CdIo_t *p_cdio, const char psz_path[])

iso9660_stat_free(p_stat);

return NULL;

}

+#endif

blocks = CDIO_EXTENT_BLOCKS(p_stat->total_size);

retval = _cdio_list_new ();

- /* Check for potential integer overflow when calculating total blocks */

+#if (SIZE_MAX / 2048) < UINT32_MAX

+ /* Check for potential integer overflow on 32-bit systems when

+ calculating total blocks */

if (blocks > (SIZE_MAX / ISO_BLOCKSIZE)) {

cdio_warn("Total size is too large");

iso9660_stat_free(p_stat);

return NULL;

}

+#endif

_dirbuf = calloc(1, blocks * ISO_BLOCKSIZE);

if (!_dirbuf)