add python script to interpret the calc cache format

Change-Id: I5d66024024b8150fad67397a0debc40aab1ae5fc
Reviewed-on: https://gerrit.libreoffice.org/41200
Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>
Tested-by: Markus Mohrhard <markus.mohrhard@googlemail.com>

1 files changed, 76 insertions, 0 deletions

diff --git a/sc/workben/cache.py b/sc/workben/cache.py
new file mode 100644
index 000000000000..da2fe2e82290
--- /dev/null
+++ b/sc/workben/cache.py
@@ -0,0 +1,76 @@
+# -*- Mode: python; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+#
+
+import sys
+import struct
+
+column_block_type = {
+        0 : "empty block",
+        1 : "numeric block",
+        2 : "string block"
+        }
+
+
+def parse_block(data, index):
+    start_row = struct.unpack('Q', data[index:index+8])[0]
+    index += 8
+    data_size = struct.unpack('Q', data[index:index+8])[0]
+    index += 8
+    block_type = struct.unpack('B', data[index:index+1])[0]
+    index += 1
+    vals = {}
+    if block_type == 1:
+        # numeric block
+        for i in range(data_size):
+            vals[start_row + i] = struct.unpack('d', data[index:index+8])[0]
+            index += 8
+    elif block_type == 2:
+        # string block
+        for i in range(data_size):
+            str_length = struct.unpack('i', data[index:index+4])[0]
+            index += 4
+            vals[start_row + i] = data[index:index+str_length].decode("utf-8")
+            index += str_length
+
+    return index, data_size, vals
+
+
+def parse_column(data, index):
+    column_index = struct.unpack('Q', data[index:index+8])[0]
+    index += 8
+    column_entries = struct.unpack('Q', data[index:index+8])[0]
+    index += 8
+    imported_columns = 0
+    column_values = {}
+    while imported_columns < column_entries:
+        index, block_size, vals = parse_block(data, index)
+        imported_columns += block_size
+        column_values.update(vals)
+    return index, column_values
+
+def parse_columns(data, index):
+    column_count = struct.unpack('Q', data[index:index+8])[0]
+    index += 8
+    columns = {}
+    for i in range(column_count):
+        index, column_values = parse_column(data, index)
+        columns[i] = column_values
+
+    return columns
+
+def main():
+    filename = sys.argv[1]
+    with open(filename, "rb") as f:
+        content = f.read()
+        index = 0
+        columns = parse_columns(content, index)
+        print(columns)
+
+if __name__ == "__main__":
+    main()
+
+# vim:set shiftwidth=4 softtabstop=4 expandtab: */