experimental/tools/mskp_parser.py

TBR=
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2268403003

Review-Url: https://codereview.chromium.org/2268403003

experimental/tools/mskp_parser.py

@@ -0,0 +1,57 @@
+#!/usr/bin/env python
+
+# Copyright 2016 Google Inc.
+# 
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# Experimental Skia Multi-Picture Doc parser.
+
+from __future__ import print_function
+
+import fileinput
+import sys
+import struct
+
+if len(sys.argv) < 2:
+  sys.stderr.write('Usage:\n\tpython %s MSKP_FILE [OUTPUT_SKP]\n\n'
+                   % sys.argv[0])
+  exit(1)
+
+mskp_src = sys.argv[1]
+src = open(mskp_src, 'rb')
+
+magic_constant = b'Skia Multi-Picture Doc\n\n'
+magic = src.read(len(magic_constant))
+if magic != magic_constant:
+  sys.stderr.write('Not a mskp file: "%s"\n' % mskp_src)
+  exit(2)
+
+version, page_count = struct.unpack('II', src.read(8))[:2]
+print('MSKP version: ', version)
+print('page count: ', page_count)
+if version > 2 or version < 1:
+  #TODO(halcanary): Remove support for version 1.
+  sys.stderr.write('unsupported mskp version\n')
+  exit(3)
+offsets = []
+for page in range(page_count):
+  print('page %3d\t' % page, end='')
+  if version == 1:
+    offset, size_x, size_y =struct.unpack('Qff', src.read(16))
+    print('offset = %-7d\t' % offset, end='')
+    offsets.append(offset)
+  elif version == 2:
+    size_x, size_y =struct.unpack('ff', src.read(8))
+  print('size = (%r,%r)' % (size_x, size_y))
+
+if len(sys.argv) >= 3:
+  with open(sys.argv[2], 'wb') as o:
+    if version == 2 or len(offsets) < 2:
+      while True:
+        file_buffer = src.read(8192)
+        if 0 == len(file_buffer):
+          break
+        o.write(file_buffer)
+    else:
+      o.write(src.read(offsets[1] - offsets[0]))