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Changeset c5e578de1969 …

Parent 5eab0eaf52a5 …

by Jelmer Vernooij Mar 26 09 at 11:17 PM

Changes to 2 files · Browse files at c5e578de1969 Showing diff from parent 5eab0eaf52a5 Diff from another changeset...

Change 1 of 1 Show Changes Only Show Entire File Loading... dulwich/object_store.py Stacked
110 111 112 113 114 115 116 117	110 111 112 113 114 115 116 117 118 119	@@ -110,8 +110,10 @@ `:return: tuple with object type and object contents.` `"""` `for pack in self.packs:`-`if sha in pack:`+`try:` `return pack.get_raw(sha, self.get_raw)`+`except KeyError:`+`pass` `# FIXME: Are thin pack deltas ever against on-disk shafiles ?` `ret = self._get_shafile(sha)` `if ret is not None:`

Change 1 of 2 Show Changes Only Show Entire File Loading... dulwich/pack.py Stacked
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623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932	`# pack.py -- For dealing wih packed git objects.` `# Copyright (C) 2007 James Westby <jw+debian@jameswestby.net>` `# Copryight (C) 2008 Jelmer Vernooij <jelmer@samba.org>` `#` `# This program is free software; you can redistribute it and/or` `# modify it under the terms of the GNU General Public License` `# as published by the Free Software Foundation; version 2` `# of the License or (at your option) a later version.` `#` `# This program is distributed in the hope that it will be useful,` `# but WITHOUT ANY WARRANTY; without even the implied warranty of` `# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the` `# GNU General Public License for more details.` `#` `# You should have received a copy of the GNU General Public License` `# along with this program; if not, write to the Free Software` `# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,` `# MA 02110-1301, USA.` `"""Classes for dealing with packed git objects.` `A pack is a compact representation of a bunch of objects, stored` `using deltas where possible.` `They have two parts, the pack file, which stores the data, and an index` `that tells you where the data is.` `To find an object you look in all of the index files 'til you find a` `match for the object name. You then use the pointer got from this as` `a pointer in to the corresponding packfile.` `"""` `try:` `from collections import defaultdict` `except ImportError:` `from misc import defaultdict` `from itertools import imap, izip` `import mmap` `import os` `import struct` `try:` `from struct import unpack_from` `except ImportError:` `from dulwich.misc import unpack_from` `import sys` `import zlib` `import difflib` `from dulwich.errors import (` `ApplyDeltaError,` `ChecksumMismatch,` `)` `from dulwich.lru_cache import (` `LRUSizeCache,` `)` `from dulwich.objects import (` `ShaFile,` `hex_to_sha,` `sha_to_hex,` `)` `from dulwich.misc import make_sha` `supports_mmap_offset = (sys.version_info[0] >= 3 or` `(sys.version_info[0] == 2 and sys.version_info[1] >= 6))` `def take_msb_bytes(map, offset):` `ret = []` `while len(ret) == 0 or ret[-1] & 0x80:` `ret.append(ord(map[offset]))` `offset += 1` `return ret` `def read_zlib(data, offset, dec_size):` `obj = zlib.decompressobj()` `x = ""` `fed = 0` `while obj.unused_data == "":` `base = offset+fed` `add = data[base:base+1024]` `if len(add) < 1024:` `add += "Z"` `fed += len(add)` `x += obj.decompress(add)` `assert len(x) == dec_size` `comp_len = fed-len(obj.unused_data)` `return x, comp_len` `def iter_sha1(iter):` `sha1 = make_sha()` `for name in iter:` `sha1.update(name)` `return sha1.hexdigest()` -`MAX_MMAP_SIZE = 256 * 1024 * 1024`+`MAX_MMAP_SIZE = 1024 * 1024 * 1024` `def simple_mmap(f, offset, size, access=mmap.ACCESS_READ):` `"""Simple wrapper for mmap() which always supports the offset parameter.` `:param f: File object.` `:param offset: Offset in the file, from the beginning of the file.` `:param size: Size of the mmap'ed area` `:param access: Access mechanism.` `:return: MMAP'd area.` `"""` `if offset+size > MAX_MMAP_SIZE and not supports_mmap_offset:` `raise AssertionError("%s is larger than 256 meg, and this version "` `"of Python does not support the offset argument to mmap().")` `if supports_mmap_offset:` `return mmap.mmap(f.fileno(), size, access=access, offset=offset)` `else:` `class ArraySkipper(object):` `def __init__(self, array, offset):` `self.array = array` `self.offset = offset` `def __getslice__(self, i, j):` `return self.array[i+self.offset:j+self.offset]` `def __getitem__(self, i):` `return self.array[i+self.offset]` `def __len__(self):` `return len(self.array) - self.offset` `def __str__(self):` `return str(self.array[self.offset:])` `mem = mmap.mmap(f.fileno(), size+offset, access=access)` `if offset == 0:` `return mem` `return ArraySkipper(mem, offset)` `class PackIndex(object):` `"""An index in to a packfile.` `Given a sha id of an object a pack index can tell you the location in the` `packfile of that object if it has it.` `To do the loop it opens the file, and indexes first 256 4 byte groups` `with the first byte of the sha id. The value in the four byte group indexed` `is the end of the group that shares the same starting byte. Subtract one` `from the starting byte and index again to find the start of the group.` `The values are sorted by sha id within the group, so do the math to find` `the start and end offset and then bisect in to find if the value is present.` `"""` `def __init__(self, filename):` `"""Create a pack index object.` `Provide it with the name of the index file to consider, and it will map` `it whenever required.` `"""` `self._filename = filename` `# Take the size now, so it can be checked each time we map the file to` `# ensure that it hasn't changed.` `self._size = os.path.getsize(filename)` `self._file = open(filename, 'r')` `self._contents = simple_mmap(self._file, 0, self._size)` `if self._contents[:4] != '\377tOc':` `self.version = 1` `self._fan_out_table = self._read_fan_out_table(0)` `else:` `(self.version, ) = unpack_from(">L", self._contents, 4)` `assert self.version in (2,), "Version was %d" % self.version` `self._fan_out_table = self._read_fan_out_table(8)` `self._name_table_offset = 8 + 0x100 * 4` `self._crc32_table_offset = self._name_table_offset + 20 * len(self)` `self._pack_offset_table_offset = self._crc32_table_offset + 4 * len(self)` `def __eq__(self, other):` `if type(self) != type(other):` `return False` `if self._fan_out_table != other._fan_out_table:` `return False` `for (name1, _, _), (name2, _, _) in izip(self.iterentries(), other.iterentries()):` `if name1 != name2:` `return False` `return True` `def close(self):` `self._file.close()` `def __len__(self):` `"""Return the number of entries in this pack index."""` `return self._fan_out_table[-1]` `def _unpack_entry(self, i):` `"""Unpack the i-th entry in the index file.` `:return: Tuple with object name (SHA), offset in pack file and` `CRC32 checksum (if known)."""` `if self.version == 1:` `(offset, name) = unpack_from(">L20s", self._contents,` `(0x100 * 4) + (i * 24))` `return (name, offset, None)` `else:` `return (self._unpack_name(i), self._unpack_offset(i),` `self._unpack_crc32_checksum(i))` `def _unpack_name(self, i):` `if self.version == 1:` `return self._unpack_entry(i)[0]` `else:` `return unpack_from("20s", self._contents,` `self._name_table_offset + i * 20)[0]` `def _unpack_offset(self, i):` `if self.version == 1:` `return self._unpack_entry(i)[1]` `else:` `return unpack_from(">L", self._contents,` `self._pack_offset_table_offset + i * 4)[0]` `def _unpack_crc32_checksum(self, i):` `if self.version == 1:` `return None` `else:` `return unpack_from(">L", self._contents,` `self._crc32_table_offset + i * 4)[0]` `def __iter__(self):` `return imap(sha_to_hex, self._itersha())` `def _itersha(self):` `for i in range(len(self)):` `yield self._unpack_name(i)` `def objects_sha1(self):` `return iter_sha1(self._itersha())` `def iterentries(self):` `"""Iterate over the entries in this pack index.` `Will yield tuples with object name, offset in packfile and crc32 checksum.` `"""` `for i in range(len(self)):` `yield self._unpack_entry(i)` `def _read_fan_out_table(self, start_offset):` `ret = []` `for i in range(0x100):` `ret.append(struct.unpack(">L", self._contents[start_offset+i4:start_offset+(i+1)4])[0])` `return ret` `def check(self):` `"""Check that the stored checksum matches the actual checksum."""` `return self.calculate_checksum() == self.get_stored_checksum()` `def calculate_checksum(self):` `f = open(self._filename, 'r')` `try:` `return make_sha(self._contents[:-20]).digest()` `finally:` `f.close()` `def get_pack_checksum(self):` `"""Return the SHA1 checksum stored for the corresponding packfile."""` `return str(self._contents[-40:-20])` `def get_stored_checksum(self):` `"""Return the SHA1 checksum stored for this index."""` `return str(self._contents[-20:])` `def object_index(self, sha):` `"""Return the index in to the corresponding packfile for the object.` `Given the name of an object it will return the offset that object lives` `at within the corresponding pack file. If the pack file doesn't have the` `object then None will be returned.` `"""` `size = os.path.getsize(self._filename)` `assert size == self._size, "Pack index %s has changed size, I don't " \` `"like that" % self._filename` `if len(sha) == 40:` `sha = hex_to_sha(sha)` `return self._object_index(sha)` `def _object_index(self, sha):` `"""See object_index"""` `idx = ord(sha[0])` `if idx == 0:` `start = 0` `else:` `start = self._fan_out_table[idx-1]` `end = self._fan_out_table[idx]` `assert start <= end` `while start <= end:` `i = (start + end)/2` `file_sha = self._unpack_name(i)` `if file_sha < sha:` `start = i + 1` `elif file_sha > sha:` `end = i - 1` `else:` `return self._unpack_offset(i)` `return None` `def read_pack_header(f):` `header = f.read(12)` `assert header[:4] == "PACK"` `(version,) = unpack_from(">L", header, 4)` `assert version in (2, 3), "Version was %d" % version` `(num_objects,) = unpack_from(">L", header, 8)` `return (version, num_objects)` `def read_pack_tail(f):` `return (f.read(20),)` `def unpack_object(map):` `bytes = take_msb_bytes(map, 0)` `type = (bytes[0] >> 4) & 0x07` `size = bytes[0] & 0x0f` `for i, byte in enumerate(bytes[1:]):` `size += (byte & 0x7f) << ((i * 7) + 4)` `raw_base = len(bytes)` `if type == 6: # offset delta` `bytes = take_msb_bytes(map, raw_base)` `assert not (bytes[-1] & 0x80)` `delta_base_offset = bytes[0] & 0x7f` `for byte in bytes[1:]:` `delta_base_offset += 1` `delta_base_offset <<= 7` `delta_base_offset += (byte & 0x7f)` `raw_base+=len(bytes)` `uncomp, comp_len = read_zlib(map, raw_base, size)` `assert size == len(uncomp)` `return type, (delta_base_offset, uncomp), comp_len+raw_base` `elif type == 7: # ref delta` `basename = map[raw_base:raw_base+20]` `uncomp, comp_len = read_zlib(map, raw_base+20, size)` `assert size == len(uncomp)` `return type, (basename, uncomp), comp_len+raw_base+20` `else:` `uncomp, comp_len = read_zlib(map, raw_base, size)` `assert len(uncomp) == size` `return type, uncomp, comp_len+raw_base` `def compute_object_size((num, obj)):` `if num in (6, 7):` `return len(obj[1])` `assert isinstance(obj, str)` `return len(obj)` `class PackData(object):` `"""The data contained in a packfile.` `Pack files can be accessed both sequentially for exploding a pack, and` `directly with the help of an index to retrieve a specific object.` `The objects within are either complete or a delta aginst another.` `The header is variable length. If the MSB of each byte is set then it` `indicates that the subsequent byte is still part of the header.` `For the first byte the next MS bits are the type, which tells you the type` `of object, and whether it is a delta. The LS byte is the lowest bits of the` `size. For each subsequent byte the LS 7 bits are the next MS bits of the` `size, i.e. the last byte of the header contains the MS bits of the size.` `For the complete objects the data is stored as zlib deflated data.` `The size in the header is the uncompressed object size, so to uncompress` `you need to just keep feeding data to zlib until you get an object back,` `or it errors on bad data. This is done here by just giving the complete` `buffer from the start of the deflated object on. This is bad, but until I` `get mmap sorted out it will have to do.` `Currently there are no integrity checks done. Also no attempt is made to try` `and detect the delta case, or a request for an object at the wrong position.` `It will all just throw a zlib or KeyError.` `"""` `def __init__(self, filename):` `"""Create a PackData object that represents the pack in the given filename.` `The file must exist and stay readable until the object is disposed of. It` `must also stay the same size. It will be mapped whenever needed.` `Currently there is a restriction on the size of the pack as the python` `mmap implementation is flawed.` `"""` `self._filename = filename` `assert os.path.exists(filename), "%s is not a packfile" % filename` `self._size = os.path.getsize(filename)` `self._header_size = 12` `assert self._size >= self._header_size, "%s is too small for a packfile (%d < %d)" % (filename, self._size, self._header_size)` `self._read_header()`-`self._offset_cache = LRUSizeCache(102410245,`+`self._offset_cache = LRUSizeCache(10241024100,` `compute_size=compute_object_size)` `def _read_header(self):` `f = open(self._filename, 'rb')` `try:` `(version, self._num_objects) = \` `read_pack_header(f)` `f.seek(self._size-20)` `(self._stored_checksum,) = read_pack_tail(f)` `finally:` `f.close()` `def __len__(self):` `"""Returns the number of objects in this pack."""` `return self._num_objects` `def calculate_checksum(self):` `"""Calculate the checksum for this pack."""` `f = open(self._filename, 'rb')` `try:` `map = simple_mmap(f, 0, self._size)` `return make_sha(map[:-20]).digest()` `finally:` `f.close()` `def resolve_object(self, offset, type, obj, get_ref, get_offset=None):` `"""Resolve an object, possibly resolving deltas when necessary.` `:return: Tuple with object type and contents.` `"""` `if not type in (6, 7): # Not a delta` `return type, obj` `if get_offset is None:` `get_offset = self.get_object_at` `if type == 6: # offset delta` `(delta_offset, delta) = obj` `assert isinstance(delta_offset, int)` `assert isinstance(delta, str)` `base_offset = offset-delta_offset` `type, base_obj = get_offset(base_offset)` `assert isinstance(type, int)` `elif type == 7: # ref delta` `(basename, delta) = obj` `assert isinstance(basename, str) and len(basename) == 20` `assert isinstance(delta, str)` `type, base_obj = get_ref(basename)` `assert isinstance(type, int)` `# Can't be a ofs delta, as we wouldn't know the base offset` `assert type != 6` `base_offset = None` `type, base_text = self.resolve_object(base_offset, type, base_obj, get_ref)` `if base_offset is not None:` `self._offset_cache[base_offset] = type, base_text` `ret = (type, apply_delta(base_text, delta))` `return ret` `def iterobjects(self):` `offset = self._header_size` `f = open(self._filename, 'rb')` `for i in range(len(self)):` `map = simple_mmap(f, offset, self._size-offset)` `(type, obj, total_size) = unpack_object(map)` `crc32 = zlib.crc32(map[:total_size]) & 0xffffffff` `yield offset, type, obj, crc32` `offset += total_size` `f.close()` `def iterentries(self, ext_resolve_ref=None):` `found = {}` `postponed = defaultdict(list)` `class Postpone(Exception):` `"""Raised to postpone delta resolving."""` `def get_ref_text(sha):` `if sha in found:` `return found[sha]` `if ext_resolve_ref:` `try:` `return ext_resolve_ref(sha)` `except KeyError:` `pass` `raise Postpone, (sha, )` `todo = list(self.iterobjects())` `while todo:` `(offset, type, obj, crc32) = todo.pop(0)` `assert isinstance(offset, int)` `assert isinstance(type, int)` `assert isinstance(obj, tuple) or isinstance(obj, str)` `try:` `type, obj = self.resolve_object(offset, type, obj, get_ref_text)` `except Postpone, (sha, ):` `postponed[sha].append((offset, type, obj))` `else:` `shafile = ShaFile.from_raw_string(type, obj)` `sha = shafile.sha().digest()` `found[sha] = (type, obj)` `yield sha, offset, crc32` `todo += postponed.get(sha, [])` `if postponed:` `raise KeyError([sha_to_hex(h) for h in postponed.keys()])` `def sorted_entries(self, resolve_ext_ref=None):` `ret = list(self.iterentries(resolve_ext_ref))` `ret.sort()` `return ret` `def create_index_v1(self, filename, resolve_ext_ref=None):` `entries = self.sorted_entries(resolve_ext_ref)` `write_pack_index_v1(filename, entries, self.calculate_checksum())` `def create_index_v2(self, filename, resolve_ext_ref=None):` `entries = self.sorted_entries(resolve_ext_ref)` `write_pack_index_v2(filename, entries, self.calculate_checksum())` `def get_stored_checksum(self):` `return self._stored_checksum` `def check(self):` `return (self.calculate_checksum() == self.get_stored_checksum())` `def get_object_at(self, offset):` `"""Given an offset in to the packfile return the object that is there.` `Using the associated index the location of an object can be looked up, and` `then the packfile can be asked directly for that object using this` `function.` `"""` `if offset in self._offset_cache:` `return self._offset_cache[offset]` `assert isinstance(offset, long) or isinstance(offset, int),\` `"offset was %r" % offset` `assert offset >= self._header_size` `size = os.path.getsize(self._filename)` `assert size == self._size, "Pack data %s has changed size, I don't " \` `"like that" % self._filename` `f = open(self._filename, 'rb')` `try:` `map = simple_mmap(f, offset, size-offset)` `ret = unpack_object(map)[:2]` `return ret` `finally:` `f.close()` `class SHA1Writer(object):` `def __init__(self, f):` `self.f = f` `self.sha1 = make_sha("")` `def write(self, data):` `self.sha1.update(data)` `self.f.write(data)` `def write_sha(self):` `sha = self.sha1.digest()` `assert len(sha) == 20` `self.f.write(sha)` `return sha` `def close(self):` `sha = self.write_sha()` `self.f.close()` `return sha` `def tell(self):` `return self.f.tell()` `def write_pack_object(f, type, object):` `"""Write pack object to a file.` `:param f: File to write to` `:param o: Object to write` `:return: Tuple with offset at which the object was written, and crc32` `"""` `ret = f.tell()` `packed_data_hdr = ""` `if type == 6: # ref delta` `(delta_base_offset, object) = object` `elif type == 7: # offset delta` `(basename, object) = object` `size = len(object)` `c = (type << 4) \| (size & 15)` `size >>= 4` `while size:` `packed_data_hdr += (chr(c \| 0x80))` `c = size & 0x7f` `size >>= 7` `packed_data_hdr += chr(c)` `if type == 6: # offset delta` `ret = [delta_base_offset & 0x7f]` `delta_base_offset >>= 7` `while delta_base_offset:` `delta_base_offset -= 1` `ret.insert(0, 0x80 \| (delta_base_offset & 0x7f))` `delta_base_offset >>= 7` `packed_data_hdr += "".join([chr(x) for x in ret])` `elif type == 7: # ref delta` `assert len(basename) == 20` `packed_data_hdr += basename` `packed_data = packed_data_hdr + zlib.compress(object)` `f.write(packed_data)` `return (f.tell(), (zlib.crc32(packed_data) & 0xffffffff))` `def write_pack(filename, objects, num_objects):` `f = open(filename + ".pack", 'w')` `try:` `entries, data_sum = write_pack_data(f, objects, num_objects)` `finally:` `f.close()` `entries.sort()` `write_pack_index_v2(filename + ".idx", entries, data_sum)` `def write_pack_data(f, objects, num_objects, window=10):` `"""Write a new pack file.` `:param filename: The filename of the new pack file.` `:param objects: List of objects to write (tuples with object and path)` `:return: List with (name, offset, crc32 checksum) entries, pack checksum` `"""` `recency = list(objects)` `# FIXME: Somehow limit delta depth` `# FIXME: Make thin-pack optional (its not used when cloning a pack)` `# Build a list of objects ordered by the magic Linus heuristic` `# This helps us find good objects to diff against us` `magic = []` `for obj, path in recency:` `magic.append( (obj.type, path, 1, -len(obj.as_raw_string()[1]), obj) )` `magic.sort()` `# Build a map of objects and their index in magic - so we can find preceeding objects` `# to diff against` `offs = {}` `for i in range(len(magic)):` `offs[magic[i][4]] = i` `# Write the pack` `entries = []` `f = SHA1Writer(f)` `f.write("PACK") # Pack header` `f.write(struct.pack(">L", 2)) # Pack version` `f.write(struct.pack(">L", num_objects)) # Number of objects in pack` `for o, path in recency:` `sha1 = o.sha().digest()` `orig_t, raw = o.as_raw_string()` `winner = raw` `t = orig_t` `#for i in range(offs[o]-window, window):` `# if i < 0 or i >= len(offs): continue` `# b = magic[i][4]` `# if b.type != orig_t: continue` `# _, base = b.as_raw_string()` `# delta = create_delta(base, raw)` `# if len(delta) < len(winner):` `# winner = delta` `# t = 6 if magic[i][2] == 1 else 7` `offset, crc32 = write_pack_object(f, t, winner)` `entries.append((sha1, offset, crc32))` `return entries, f.write_sha()` `def write_pack_index_v1(filename, entries, pack_checksum):` `"""Write a new pack index file.` `:param filename: The filename of the new pack index file.` `:param entries: List of tuples with object name (sha), offset_in_pack, and` `crc32_checksum.` `:param pack_checksum: Checksum of the pack file.` `"""` `f = open(filename, 'w')` `f = SHA1Writer(f)` `fan_out_table = defaultdict(lambda: 0)` `for (name, offset, entry_checksum) in entries:` `fan_out_table[ord(name[0])] += 1` `# Fan-out table` `for i in range(0x100):` `f.write(struct.pack(">L", fan_out_table[i]))` `fan_out_table[i+1] += fan_out_table[i]` `for (name, offset, entry_checksum) in entries:` `f.write(struct.pack(">L20s", offset, name))` `assert len(pack_checksum) == 20` `f.write(pack_checksum)` `f.close()` `def create_delta(base_buf, target_buf):` `"""Use python difflib to work out how to transform base_buf to target_buf"""` `assert isinstance(base_buf, str)` `assert isinstance(target_buf, str)` `out_buf = ""` `# write delta header` `def encode_size(size):` `ret = ""` `c = size & 0x7f` `size >>= 7` `while size:` `ret += chr(c \| 0x80)` `c = size & 0x7f` `size >>= 7` `ret += chr(c)` `return ret` `out_buf += encode_size(len(base_buf))` `out_buf += encode_size(len(target_buf))` `# write out delta opcodes` `seq = difflib.SequenceMatcher(a=base_buf, b=target_buf)` `for opcode, i1, i2, j1, j2 in seq.get_opcodes():` `# Git patch opcodes don't care about deletes!` `#if opcode == "replace" or opcode == "delete":` `# pass` `if opcode == "equal":` `# If they are equal, unpacker will use data from base_buf` `# Write out an opcode that says what range to use` `scratch = ""` `op = 0x80` `o = i1` `for i in range(4):` `if o & 0xff << i8:` `scratch += chr(o >> i)` `op \|= 1 << i` `s = i2 - i1` `for i in range(2):` `if s & 0xff << i8:` `scratch += chr(s >> i)` `op \|= 1 << (4+i)` `out_buf += chr(op)` `out_buf += scratch` `if opcode == "replace" or opcode == "insert":` `# If we are replacing a range or adding one, then we just` `# output it to the stream (prefixed by its size)` `s = j2 - j1` `o = j1` `while s > 127:` `out_buf += chr(127)` `out_buf += target_buf[o:o+127]` `s -= 127` `o += 127` `out_buf += chr(s)` `out_buf += target_buf[o:o+s]` `return out_buf` `def apply_delta(src_buf, delta):` `"""Based on the similar function in git's patch-delta.c."""` `assert isinstance(src_buf, str), "was %r" % (src_buf,)` `assert isinstance(delta, str)` `out = []` `index = 0` `delta_length = len(delta)` `def pop(delta, index):` `ret = delta[index]` `index += 1` `return ord(ret), index` `def get_delta_header_size(delta, index):` `size = 0` `i = 0` `while delta:` `cmd, index = pop(delta, index)` `size \|= (cmd & ~0x80) << i` `i += 7` `if not cmd & 0x80:` `break` `return size, index` `src_size, index = get_delta_header_size(delta, index)` `dest_size, index = get_delta_header_size(delta, index)` `assert src_size == len(src_buf), "%d vs %d" % (src_size, len(src_buf))` `while index < delta_length:` `cmd, index = pop(delta, index)` `if cmd & 0x80:` `cp_off = 0` `for i in range(4):` `if cmd & (1 << i):` `x, index = pop(delta, index)` `cp_off \|= x << (i * 8)` `cp_size = 0` `for i in range(3):` `if cmd & (1 << (4+i)):` `x, index = pop(delta, index)` `cp_size \|= x << (i * 8)` `if cp_size == 0:` `cp_size = 0x10000` `if (cp_off + cp_size < cp_size or` `cp_off + cp_size > src_size or` `cp_size > dest_size):` `break` `out.append(src_buf[cp_off:cp_off+cp_size])` `elif cmd != 0:` `out.append(delta[index:index+cmd])` `index += cmd` `else:` `raise ApplyDeltaError("Invalid opcode 0")` `if index != delta_length:` `raise ApplyDeltaError("delta not empty: %r" % delta[index:])` `out = ''.join(out)` `if dest_size != len(out):` `raise ApplyDeltaError("dest size incorrect")` `return out` `def write_pack_index_v2(filename, entries, pack_checksum):` `"""Write a new pack index file.` `:param filename: The filename of the new pack index file.` `:param entries: List of tuples with object name (sha), offset_in_pack, and` `crc32_checksum.` `:param pack_checksum: Checksum of the pack file.` `"""` `f = open(filename, 'w')` `f = SHA1Writer(f)` `f.write('\377tOc') # Magic!` `f.write(struct.pack(">L", 2))` `fan_out_table = defaultdict(lambda: 0)` `for (name, offset, entry_checksum) in entries:` `fan_out_table[ord(name[0])] += 1` `# Fan-out table` `for i in range(0x100):` `f.write(struct.pack(">L", fan_out_table[i]))` `fan_out_table[i+1] += fan_out_table[i]` `for (name, offset, entry_checksum) in entries:` `f.write(name)` `for (name, offset, entry_checksum) in entries:` `f.write(struct.pack(">L", entry_checksum))` `for (name, offset, entry_checksum) in entries:` `# FIXME: handle if MSBit is set in offset` `f.write(struct.pack(">L", offset))` `# FIXME: handle table for pack files > 8 Gb` `assert len(pack_checksum) == 20` `f.write(pack_checksum)` `f.close()` `class Pack(object):` `def __init__(self, basename):` `self._basename = basename` `self._data_path = self._basename + ".pack"` `self._idx_path = self._basename + ".idx"` `self._data = None` `self._idx = None` `def name(self):` `"""The SHA over the SHAs of the objects in this pack."""` `return self.idx.objects_sha1()` `@property` `def data(self):` `if self._data is None:` `self._data = PackData(self._data_path)` `assert len(self.idx) == len(self._data)` `idx_stored_checksum = self.idx.get_pack_checksum()` `data_stored_checksum = self._data.get_stored_checksum()` `if idx_stored_checksum != data_stored_checksum:` `raise ChecksumMismatch(sha_to_hex(idx_stored_checksum),` `sha_to_hex(data_stored_checksum))` `return self._data` `@property` `def idx(self):` `if self._idx is None:` `self._idx = PackIndex(self._idx_path)` `return self._idx` `def close(self):` `if self._data is not None:` `self._data.close()` `self.idx.close()` `def __eq__(self, other):` `return type(self) == type(other) and self.idx == other.idx` `def __len__(self):` `"""Number of entries in this pack."""` `return len(self.idx)` `def __repr__(self):` `return "Pack(%r)" % self._basename` `def __iter__(self):` `"""Iterate over all the sha1s of the objects in this pack."""` `return iter(self.idx)` `def check(self):` `if not self.idx.check():` `return False` `if not self.data.check():` `return False` `return True` `def get_stored_checksum(self):` `return self.data.get_stored_checksum()` `def __contains__(self, sha1):` `"""Check whether this pack contains a particular SHA1."""` `return (self.idx.object_index(sha1) is not None)` `def get_raw(self, sha1, resolve_ref=None):` `offset = self.idx.object_index(sha1)` `if offset is None:` `raise KeyError(sha1)` `type, obj = self.data.get_object_at(offset)` `if isinstance(offset, long):` `offset = int(offset)` `assert isinstance(offset, int)` `return self.data.resolve_object(offset, type, obj, resolve_ref)` `def __getitem__(self, sha1):` `"""Retrieve the specified SHA1."""` `type, uncomp = self.get_raw(sha1)` `return ShaFile.from_raw_string(type, uncomp)` `def iterobjects(self, get_raw=None):` `if get_raw is None:` `def get_raw(x):` `raise KeyError(x)` `for offset, type, obj, crc32 in self.data.iterobjects():` `assert isinstance(offset, int)` `yield ShaFile.from_raw_string(` `*self.data.resolve_object(offset, type, obj, get_raw))` `def load_packs(path):` `if not os.path.exists(path):` `return` `for name in os.listdir(path):` `if name.startswith("pack-") and name.endswith(".pack"):` `yield Pack(os.path.join(path, name[:-len(".pack")]))`

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