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-rw-r--r--block/dmg.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/block/dmg.c b/block/dmg.c
index ba8ec344d4..675e840ca5 100644
--- a/block/dmg.c
+++ b/block/dmg.c
@@ -254,6 +254,25 @@ static int dmg_read_mish_block(BDRVDMGState *s, DmgHeaderState *ds,
for (i = s->n_chunks; i < s->n_chunks + chunk_count; i++) {
s->types[i] = buff_read_uint32(buffer, offset);
if (!dmg_is_known_block_type(s->types[i])) {
+ switch (s->types[i]) {
+ case UDBZ:
+ warn_report_once("dmg-bzip2 module is missing, accessing bzip2 "
+ "compressed blocks will result in I/O errors");
+ break;
+ case ULFO:
+ warn_report_once("dmg-lzfse module is missing, accessing lzfse "
+ "compressed blocks will result in I/O errors");
+ break;
+ case UDCM:
+ case UDLE:
+ /* Comments and last entry can be ignored without problems */
+ break;
+ default:
+ warn_report_once("Image contains chunks of unknown type %x, "
+ "accessing them will result in I/O errors",
+ s->types[i]);
+ break;
+ }
chunk_count--;
i--;
offset += 40;