Fix a bug related to 99e12af4e2b866c011fe0106cd1e0bfdcc8fe9c6.

lzma_metadata.header_metadata_size was not properly set to
zero if the Metadata had only the Metadata Flags field.

diff --git a/src/liblzma/common/metadata_decoder.c b/src/liblzma/common/metadata_decoder.c
index 9704575..8ff4e25 100644 (file)
--- a/src/liblzma/common/metadata_decoder.c
+++ b/src/liblzma/common/metadata_decoder.c
@@ -169,12 +169,6 @@ process(lzma_coder *coder, lzma_allocator *allocator)
                                return LZMA_DATA_ERROR;
 
                        --coder->todo_count;
-               } else {
-                       // Zero indicates that Size of Header Metadata Block
-                       // is not present. That is, after successful Metadata
-                       // decoding, metadata->header_metadata_size is
-                       // never LZMA_VLI_VALUE_UNKNOWN.
-                       coder->metadata->header_metadata_size = 0;
                }
 
                coder->sequence = SEQ_TOTAL_SIZE;
@@ -494,6 +488,13 @@ metadata_decode(lzma_coder *coder, lzma_allocator *allocator,
                        if (coder->todo_count != 0)
                                return LZMA_DATA_ERROR;
 
+                       // If Size of Header Metadata Block was not
+                       // present, we use zero as its size instead
+                       // of LZMA_VLI_VALUE_UNKNOWN.
+                       if (coder->metadata->header_metadata_size
+                                       == LZMA_VLI_VALUE_UNKNOWN)
+                               coder->metadata->header_metadata_size = 0;
+
                        return LZMA_STREAM_END;
                }
        }