Extract breakpad symbol files for Linux official builds.

build/linux/dump_signature.py

+#!/usr/bin/python2.4
+#
+# Copyright (c) 2009 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+#
+# This generates symbol signatures with the same algorithm as
+# src/breakpad/linux/minidump_writer.cc@17081
+
+import sys
+
+if len(sys.argv) != 2:
+  sys.stderr.write("Error, no filename specified.\n")
+  sys.exit(1)
+
+bin = open(sys.argv[1])
+data = bin.read(4096)
+if len(data) != 4096:
+  sys.stderr.write("Error, did not read first page of data.\n");

[Mark Mentovai, 2009/06/12 17:30:10]

Don't we want sys.exit(1) here too?

+bin.close()
+
+signature = [0] * 16
+for i in range(0, 4096):
+  signature[i % 16] ^= ord(data[i])
+
+out = ''

[Mark Mentovai, 2009/06/12 17:30:10]

I have a better recipe for this, and it's endian-neutral:

# at top
import struct

# here
out = '%08x%04x%04x%02x%02x%02x%02x%02x%02x%02x%02x0' %
struct.unpack('I2H8B',struct.pack('16B',*signature))

(note I've left the 0 on the end.)

+# Assume we're running on little endian
+for i in [3, 2, 1, 0, 5, 4, 7, 6, 8, 9, 10, 11, 12, 13, 14, 15]:
+  out += '%02X' % signature[i]
+out += '0'

[Mark Mentovai, 2009/06/12 17:30:10]

I know what the 0 means, but will others?

Put a comment here, even just a same-line deal like

out += '0'  # Linux always uses generation 0

+sys.stdout.write(out)