add specification for SerpentOS .stone files

archive/stone.ksy

@@ -0,0 +1,69 @@
+meta:
+  id: stone
+  title: SerpentOS Stone
+  license: Zlib
+  endian: be
+doc-ref: https://github.com/serpent-os/libmoss/blob/841a6d67/source/moss/format/binary/archive_header.d
+seq:
+  - id: header
+    type: header
+    size: 32
+  - id: payloads
+    type: payload
+    repeat: expr
+    repeat-expr: header.num_payloads
+types:
+  header:
+    seq:
+      - id: signature
+        contents: [0, 0x6d, 0x6f, 0x73]
+      - id: num_payloads
+        type: u2
+      - id: integrity_check
+        contents: [0, 0, 1, 0, 0, 2, 0, 0, 3, 0, 0, 4, 0, 0, 5, 0, 0, 6, 0, 0, 7]
+      - id: file_type
+        type: u1
+        enum: file_types
+      - id: version
+        type: u4
+  payload:
+    -webide-representation: "{type}"
+    seq:
+      - id: len_data
+        type: u8
+      - id: len_usable_data
+        type: u8
+        # use len_uncompressed instead?
+      - id: xxhash3_64
+        size: 8
+      - id: num_records
+        type: u4
+      - id: payload_version
+        type: u2
+      - id: type
+        type: u1
+        enum: payload_type
+      - id: compression
+        type: u1
+        enum: compression
+      - id: data
+        size: len_data
+enums:
+  file_types:
+    0: unknown
+    1: binary
+    2: delta
+    3: repository
+    4: build_manifest
+  compression:
+    0: unknown
+    1: no_compression
+    2: zstd
+  payload_type:
+    0: unknown
+    1: meta
+    2: content
+    3: layout
+    4: index
+    5: attributes
+    6: dumb