Add incremental storage manager reader.

src/tablestream/templates/incremental_storage_manager.ksy

@@ -0,0 +1,176 @@
+meta:
+    id: table_incremental_store
+    title: Casacore Table Data System StandardStMan layout
+    application:
+      - casacore
+      - AIPS++
+      - CASA
+    tags:
+      - scientific
+      - astronomy
+    license: LGPL-2.0-or-later
+    ks-version: 0.10
+    endian: le
+
+doc: |
+  The [casacore table system](https://casacore.github.io/casacore-notes/255.html) is a binary, table
+  oriented storage system for radio astronoy data. Many systems use it to store, manipulate and process
+  the data collected from radio telescopes. It can be used to store both the raw visibilities as collected
+  from the telescopes and the images that are produced as a final product. This file parses only the
+  table description stored in the table.dat file within the table directory.
+
+seq:
+    - id: header
+      type: header
+    - id: trash
+      size: 512 - _io.pos
+    - id: data
+      type: bucket(header.bucket_size)
+      repeat: expr
+      repeat-expr: header.num_buckets
+    - id: index_set
+      type: index_set
+
+types:
+
+    bucket:
+        params:
+          - id: bucket_size
+            type: u4
+        seq:
+          - id: index_offset
+            type: u4
+          - id: data
+            size: index_offset - 4
+          - id: index
+            size: bucket_size - index_offset
+        instances:
+          first_col:
+            pos: 28977
+            type: one_col
+
+    one_col:
+        seq:
+          - id: rows_stored
+            type: u4
+          - id: rows_populated
+            type: u4
+            repeat: expr
+            repeat-expr: rows_stored
+          - id: some_int
+            type: u4
+            repeat: expr
+            repeat-expr: 50
+
+    onex_col:
+        seq:
+          - id: num_rows
+            type: u4
+          - id: row_numbers_of_values_stored_in_row
+            type: u4
+          - id: offset_in_data_part_of_values_stored
+            type: u4
+            repeat: expr
+            repeat-expr: num_rows
+
+    data_block:
+        params:
+          - id: block_size
+            type: u4
+        seq:
+          - id: block
+            size: block_size
+
+    type_name:
+        params:
+          - id: value
+            type: str
+        seq:
+          - id: size
+            type: u4
+          - id: name
+            size: value.length # `str.length` gives the number of *characters*, not bytes as we would need here; but in ASCII they're equal
+            type: str
+            encoding: ASCII
+            valid:
+              eq: value
+
+    header:
+        seq:
+          - id: magic
+            contents: [ 0xbe, 0xbe, 0xbe, 0xbe ]
+            doc: casa magic unsigned int 3200171710  190 190 190 190
+          - id: number01
+            type: u4
+          - id: type
+            type: string
+          - id: version
+            doc: 4 is big endian while 5 is little endian
+            type: u4
+          - id: isbigendian
+            type: u1
+            if: version == 5
+          - id: bucket_size
+            type: u4
+          - id: num_buckets
+            type: u4
+          - id: persistent_cache_size
+            type: u4
+          - id: unique_column_number
+            type: u4
+          - id: number_free_buckets
+            type: u4
+          - id: first_free_bucket
+            type: s4
+
+    index_set:
+        seq:
+          - id: magic
+            contents: [ 0xbe, 0xbe, 0xbe, 0xbe ]
+            doc: casa magic unsigned int 3200171710  190 190 190 190
+          - id: size
+            type: u4
+          - id: type
+            type: type_name("ISMIndex")
+          - id: version
+            type: u4
+          - id: blocks_in_use
+            type: u4
+          - id: index_2_row
+            doc: rows_p in ISMIndex.cc
+            type: index_map(version)
+          - id: index_2_bucket
+            doc: bucketNr_p in ISMIndex.cc, row number index_2_row[i] starts in bucket number index_2_bucket[i]
+            type: index_map(version)
+
+    index_map:
+        params:
+          - id: index_version
+            type: u4
+        seq:
+          - id: number
+            type: u4
+          - id: type
+            type: type_name("Block")
+          - id: version
+            type: u4
+          - id: size
+            type: u4
+          - id: elements
+            type:
+              switch-on: index_version
+              cases:
+                1: u4
+                _: u8
+            repeat: expr
+            repeat-expr: size
+
+
+    string:
+        seq:
+          - id: len
+            type: u4
+          - id: value
+            type: str
+            encoding: ASCII
+            size: len