зеркало из https://github.com/mozilla/pjs.git
375 строки
13 KiB
Python
375 строки
13 KiB
Python
# ***** BEGIN LICENSE BLOCK *****
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# Version: MPL 1.1/GPL 2.0/LGPL 2.1
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#
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# The contents of this file are subject to the Mozilla Public License Version
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# 1.1 (the "License"); you may not use this file except in compliance with
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# the License. You may obtain a copy of the License at
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# http://www.mozilla.org/MPL/
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#
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# Software distributed under the License is distributed on an "AS IS" basis,
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# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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# for the specific language governing rights and limitations under the
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# License.
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#
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# The Original Code is mozilla.org code
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#
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# The Initial Developer of the Original Code is
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# Mozilla Foundation.
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# Portions created by the Initial Developer are Copyright (C) 2010
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# the Initial Developer. All Rights Reserved.
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#
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# Contributor(s):
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# Taras Glek <tglek@mozilla.com>
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#
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# Alternatively, the contents of this file may be used under the terms of
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# either the GNU General Public License Version 2 or later (the "GPL"), or
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# the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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# in which case the provisions of the GPL or the LGPL are applicable instead
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# of those above. If you wish to allow use of your version of this file only
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# under the terms of either the GPL or the LGPL, and not to allow others to
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# use your version of this file under the terms of the MPL, indicate your
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# decision by deleting the provisions above and replace them with the notice
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# and other provisions required by the GPL or the LGPL. If you do not delete
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# the provisions above, a recipient may use your version of this file under
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# the terms of any one of the MPL, the GPL or the LGPL.
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#
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# ***** END LICENSE BLOCK *****
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import sys, os, subprocess, struct, re
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local_file_header = [
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("signature", "uint32"),
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("min_version", "uint16"),
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("general_flag", "uint16"),
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("compression", "uint16"),
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("lastmod_time", "uint16"),
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("lastmod_date", "uint16"),
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("crc32", "uint32"),
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("compressed_size", "uint32"),
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("uncompressed_size", "uint32"),
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("filename_size", "uint16"),
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("extra_field_size", "uint16"),
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("filename", "filename_size"),
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("extra_field", "extra_field_size"),
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("data", "compressed_size")
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]
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cdir_entry = [
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("signature", "uint32"),
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("creator_version", "uint16"),
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("min_version", "uint16"),
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("general_flag", "uint16"),
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("compression", "uint16"),
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("lastmod_time", "uint16"),
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("lastmod_date", "uint16"),
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("crc32", "uint32"),
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("compressed_size", "uint32"),
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("uncompressed_size", "uint32"),
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("filename_size", "uint16"),
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("extrafield_size", "uint16"),
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("filecomment_size", "uint16"),
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("disknum", "uint16"),
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("internal_attr", "uint16"),
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("external_attr", "uint32"),
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("offset", "uint32"),
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("filename", "filename_size"),
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("extrafield", "extrafield_size"),
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("filecomment", "filecomment_size"),
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]
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cdir_end = [
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("signature", "uint32"),
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("disk_num", "uint16"),
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("cdir_disk", "uint16"),
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("disk_entries", "uint16"),
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("cdir_entries", "uint16"),
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("cdir_size", "uint32"),
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("cdir_offset", "uint32"),
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("comment_size", "uint16"),
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]
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type_mapping = { "uint32":"I", "uint16":"H"}
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def format_struct (format):
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string_fields = {}
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fmt = "<"
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for (name,value) in iter(format):
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try:
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fmt += type_mapping[value][0]
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except KeyError:
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string_fields[name] = value
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return (fmt, string_fields)
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def size_of(format):
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return struct.calcsize(format_struct(format)[0])
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class MyStruct:
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def __init__(self, format, string_fields):
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self.__dict__["struct_members"] = {}
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self.__dict__["format"] = format
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self.__dict__["string_fields"] = string_fields
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def addMember(self, name, value):
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self.__dict__["struct_members"][name] = value
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def __getattr__(self, item):
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try:
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return self.__dict__["struct_members"][item]
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except:
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pass
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print("no %s" %item)
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print(self.__dict__["struct_members"])
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raise AttributeError
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def __setattr__(self, item, value):
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if item in self.__dict__["struct_members"]:
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self.__dict__["struct_members"][item] = value
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else:
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raise AttributeError
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def pack(self):
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extra_data = ""
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values = []
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string_fields = self.__dict__["string_fields"]
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struct_members = self.__dict__["struct_members"]
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format = self.__dict__["format"]
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for (name,_) in format:
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if name in string_fields:
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extra_data = extra_data + struct_members[name]
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else:
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values.append(struct_members[name]);
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return struct.pack(format_struct(format)[0], *values) + extra_data
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ENDSIG = 0x06054b50
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def assert_true(cond, msg):
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if not cond:
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raise Exception(msg)
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exit(1)
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class BinaryBlob:
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def __init__(self, f):
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self.data = open(f, "rb").read()
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self.offset = 0
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self.length = len(self.data)
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def readAt(self, pos, length):
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self.offset = pos + length
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return self.data[pos:self.offset]
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def read_struct (self, format, offset = None):
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if offset == None:
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offset = self.offset
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(fstr, string_fields) = format_struct(format)
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size = struct.calcsize(fstr)
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data = self.readAt(offset, size)
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ret = struct.unpack(fstr, data)
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retstruct = MyStruct(format, string_fields)
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i = 0
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for (name,_) in iter(format):
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member_desc = None
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if not name in string_fields:
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member_data = ret[i]
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i = i + 1
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else:
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# zip has data fields which are described by other struct fields, this does
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# additional reads to fill em in
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member_desc = string_fields[name]
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member_data = self.readAt(self.offset, retstruct.__getattr__(member_desc))
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retstruct.addMember(name, member_data)
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# sanity check serialization code
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data = self.readAt(offset, self.offset - offset)
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out_data = retstruct.pack()
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assert_true(out_data == data, "Serialization fail %d !=%d"% (len(out_data), len(data)))
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return retstruct
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def optimizejar(jar, outjar, inlog = None):
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if inlog is not None:
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inlog = open(inlog).read().rstrip()
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# in the case of an empty log still move the index forward
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if len(inlog) == 0:
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inlog = []
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else:
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inlog = inlog.split("\n")
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outlog = []
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jarblob = BinaryBlob(jar)
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dirend = jarblob.read_struct(cdir_end, jarblob.length - size_of(cdir_end))
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assert_true(dirend.signature == ENDSIG, "no signature in the end");
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cdir_offset = dirend.cdir_offset
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readahead = 0
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if inlog is None and cdir_offset == 4:
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readahead = struct.unpack("<I", jarblob.readAt(0, 4))[0]
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print("%s: startup data ends at byte %d" % (outjar, readahead));
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total_stripped = 0;
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jarblob.offset = cdir_offset
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central_directory = []
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for i in range(0, dirend.cdir_entries):
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entry = jarblob.read_struct(cdir_entry)
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if entry.filename[-1:] == "/":
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total_stripped += len(entry.pack())
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else:
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total_stripped += entry.extrafield_size
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central_directory.append(entry)
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reordered_count = 0
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if inlog is not None:
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dup_guard = set()
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for ordered_name in inlog:
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if ordered_name in dup_guard:
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continue
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else:
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dup_guard.add(ordered_name)
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found = False
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for i in range(reordered_count, len(central_directory)):
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if central_directory[i].filename == ordered_name:
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# swap the cdir entries
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tmp = central_directory[i]
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central_directory[i] = central_directory[reordered_count]
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central_directory[reordered_count] = tmp
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reordered_count = reordered_count + 1
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found = True
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break
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if not found:
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print( "Can't find '%s' in %s" % (ordered_name, jar))
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outfd = open(outjar, "wb")
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out_offset = 0
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if inlog is not None:
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# have to put central directory at offset 4 cos 0 confuses some tools.
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# This also lets us specify how many entries should be preread
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dirend.cdir_offset = 4
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# make room for central dir + end of dir + 4 extra bytes at front
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out_offset = dirend.cdir_offset + dirend.cdir_size + size_of(cdir_end) - total_stripped
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outfd.seek(out_offset)
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cdir_data = ""
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written_count = 0
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crc_mapping = {}
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dups_found = 0
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dupe_bytes = 0
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# store number of bytes suggested for readahead
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for entry in central_directory:
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# read in the header twice..first for comparison, second time for convenience when writing out
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jarfile = jarblob.read_struct(local_file_header, entry.offset)
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assert_true(jarfile.filename == entry.filename, "Directory/Localheader mismatch")
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# drop directory entries
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if entry.filename[-1:] == "/":
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total_stripped += len(jarfile.pack())
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dirend.cdir_entries -= 1
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continue
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# drop extra field data
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else:
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total_stripped += jarfile.extra_field_size;
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entry.extrafield = jarfile.extra_field = ""
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entry.extrafield_size = jarfile.extra_field_size = 0
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# January 1st, 2010
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entry.lastmod_date = jarfile.lastmod_date = ((2010 - 1980) << 9) | (1 << 5) | 1
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entry.lastmod_time = jarfile.lastmod_time = 0
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data = jarfile.pack()
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outfd.write(data)
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old_entry_offset = entry.offset
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entry.offset = out_offset
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out_offset = out_offset + len(data)
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entry_data = entry.pack()
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cdir_data += entry_data
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expected_len = entry.filename_size + entry.extrafield_size + entry.filecomment_size
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assert_true(len(entry_data) != expected_len,
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"%s entry size - expected:%d got:%d" % (entry.filename, len(entry_data), expected_len))
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written_count += 1
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if entry.crc32 in crc_mapping:
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dups_found += 1
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dupe_bytes += entry.compressed_size + len(data) + len(entry_data)
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print("%s\n\tis a duplicate of\n%s\n---"%(entry.filename, crc_mapping[entry.crc32]))
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else:
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crc_mapping[entry.crc32] = entry.filename;
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if inlog is not None:
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if written_count == reordered_count:
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readahead = out_offset
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print("%s: startup data ends at byte %d"%( outjar, readahead));
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elif written_count < reordered_count:
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pass
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#print("%s @ %d" % (entry.filename, out_offset))
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elif readahead >= old_entry_offset + len(data):
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outlog.append(entry.filename)
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reordered_count += 1
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if inlog is None:
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dirend.cdir_offset = out_offset
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if dups_found > 0:
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print("WARNING: Found %d duplicate files taking %d bytes"%(dups_found, dupe_bytes))
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dirend.cdir_size = len(cdir_data)
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dirend.disk_entries = dirend.cdir_entries
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dirend_data = dirend.pack()
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assert_true(size_of(cdir_end) == len(dirend_data), "Failed to serialize directory end correctly. Serialized size;%d, expected:%d"%(len(dirend_data), size_of(cdir_end)));
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outfd.seek(dirend.cdir_offset)
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outfd.write(cdir_data)
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outfd.write(dirend_data)
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# for ordered jars the central directory is written in the begining of the file, so a second central-directory
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# entry has to be written in the end of the file
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if inlog is not None:
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outfd.seek(0)
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outfd.write(struct.pack("<I", readahead));
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outfd.seek(out_offset)
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outfd.write(dirend_data)
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print "Stripped %d bytes" % total_stripped
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print "%s %d/%d in %s" % (("Ordered" if inlog is not None else "Deoptimized"),
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reordered_count, len(central_directory), outjar)
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outfd.close()
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return outlog
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if len(sys.argv) != 5:
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print "Usage: --optimize|--deoptimize %s JAR_LOG_DIR IN_JAR_DIR OUT_JAR_DIR" % sys.argv[0]
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exit(1)
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jar_regex = re.compile("\\.jar?$")
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def optimize(JAR_LOG_DIR, IN_JAR_DIR, OUT_JAR_DIR):
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ls = os.listdir(IN_JAR_DIR)
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for jarfile in ls:
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if not re.search(jar_regex, jarfile):
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continue
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injarfile = os.path.join(IN_JAR_DIR, jarfile)
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outjarfile = os.path.join(OUT_JAR_DIR, jarfile)
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logfile = os.path.join(JAR_LOG_DIR, jarfile + ".log")
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if not os.path.isfile(logfile):
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logfile = None
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optimizejar(injarfile, outjarfile, logfile)
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def deoptimize(JAR_LOG_DIR, IN_JAR_DIR, OUT_JAR_DIR):
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if not os.path.exists(JAR_LOG_DIR):
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os.makedirs(JAR_LOG_DIR)
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ls = os.listdir(IN_JAR_DIR)
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for jarfile in ls:
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if not re.search(jar_regex, jarfile):
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continue
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injarfile = os.path.join(IN_JAR_DIR, jarfile)
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outjarfile = os.path.join(OUT_JAR_DIR, jarfile)
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logfile = os.path.join(JAR_LOG_DIR, jarfile + ".log")
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log = optimizejar(injarfile, outjarfile, None)
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open(logfile, "wb").write("\n".join(log))
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def main():
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MODE = sys.argv[1]
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JAR_LOG_DIR = sys.argv[2]
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IN_JAR_DIR = sys.argv[3]
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OUT_JAR_DIR = sys.argv[4]
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if MODE == "--optimize":
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optimize(JAR_LOG_DIR, IN_JAR_DIR, OUT_JAR_DIR)
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elif MODE == "--deoptimize":
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deoptimize(JAR_LOG_DIR, IN_JAR_DIR, OUT_JAR_DIR)
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else:
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print("Unknown mode %s" % MODE)
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exit(1)
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if __name__ == '__main__':
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main()
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