https://git.reactos.org/?p=reactos.git;a=commitdiff;h=d0847939e4a0fddd1be253265be3e09c18adcf28
commit d0847939e4a0fddd1be253265be3e09c18adcf28 Author: Victor Perevertkin <vic...@perevertkin.ru> AuthorDate: Tue Aug 14 17:51:03 2018 +0300 Commit: Pierre Schweitzer <pie...@reactos.org> CommitDate: Mon Aug 20 08:26:56 2018 +0200 [BTRFSTOOLS] Added python scripts for inspecting BTRFS filesystem internals --- .../devutils/btrfstools/btrfs_playground.py | 40 + .../devutils/btrfstools/btrfs_structures.py | 1292 ++++++++++++++++++++ .../applications/devutils/btrfstools/crc32c.py | 105 ++ 3 files changed, 1437 insertions(+) diff --git a/modules/rosapps/applications/devutils/btrfstools/btrfs_playground.py b/modules/rosapps/applications/devutils/btrfstools/btrfs_playground.py new file mode 100644 index 0000000000..2a861e3af5 --- /dev/null +++ b/modules/rosapps/applications/devutils/btrfstools/btrfs_playground.py @@ -0,0 +1,40 @@ +# PROJECT: Python tools for traversing BTRFS structures +# LICENSE: GPL-2.0+ (https://spdx.org/licenses/GPL-2.0+) +# PURPOSE: Script for obtaining freeldr.sys from BTRFS disk image +# COPYRIGHT: Copyright 2018 Victor Perevertkin (vic...@perevertkin.ru) + +from btrfs_structures import * +import crc32c + +fs = FileSystem('btrfs-big.bin', 0x7e00) + +fs.print_chunk_map() + + +freeldr_dir_key = Key(256, DIR_ITEM_KEY, crc32c.name_hash('freeldr.sys')) # 256 - root dir objectid crc32c.name_hash('freeldr.sys') +print(freeldr_dir_key) + +print('!!!!!!!!!!!!!!!!!!!! fs tree 1') +fs_level, fs_root = fs.fs_root +freeldr_dir_key, freeldr_dir_item = fs.search_tree(fs_level, fs_root, freeldr_dir_key) +fs.search_tree(fs_level, fs_root, freeldr_dir_key, fs.print_node) + +freeldr_item, = (x for x in freeldr_dir_item if x.name.decode('utf-8') == 'freeldr.sys') +freeldr_extent_data_key = Key(freeldr_item.location.objectid, EXTENT_DATA_KEY, 0) + +print('!!!!!!!!!!!!!!!!!!!! fs tree 2') +freeldr_extent_data_key, freeldr_extent_data_item = fs.search_tree(fs_level, fs_root, freeldr_extent_data_key) +fs.search_tree(fs_level, fs_root, freeldr_extent_data_key, fs.print_node) + +# # exploring extent tree +print('!!!!!!!!!!!!!!!!!!!! extent tree') +extent_level, extent_root = fs.extent_root +exkey, extent_item = fs.search_tree(extent_level, extent_root, Key(freeldr_extent_data_item.disk_bytenr, EXTENT_ITEM_KEY, freeldr_extent_data_item.disk_num_bytes)) + +print(freeldr_extent_data_item) +fs.fd.seek(fs.logical_to_physical(extent_item.vaddr)) +freeldr = fs.fd.read(freeldr_extent_data_item.num_bytes) + +file = open("readed_freeldr.sys", "wb") +file.write(freeldr) +print(crc32c.name_hash('freeldr.sys')) diff --git a/modules/rosapps/applications/devutils/btrfstools/btrfs_structures.py b/modules/rosapps/applications/devutils/btrfstools/btrfs_structures.py new file mode 100644 index 0000000000..726a23cf58 --- /dev/null +++ b/modules/rosapps/applications/devutils/btrfstools/btrfs_structures.py @@ -0,0 +1,1292 @@ +# PROJECT: Python tools for traversing BTRFS structures +# LICENSE: GPL-2.0+ (https://spdx.org/licenses/GPL-2.0+) +# PURPOSE: Classes and structures for BTRFS on-disk layout +# COPYRIGHT: Copyright 2018 Victor Perevertkin (vic...@perevertkin.ru) + +# some code was taken from https://github.com/knorrie/python-btrfs + +from btrfs_constants import * +import struct +from collections import namedtuple, OrderedDict +import collections.abc +import copy +import datetime +import os +import uuid +import crc32c + +ULLONG_MAX = (1 << 64) - 1 +ULONG_MAX = (1 << 32) - 1 + + +def ULL(n): + return n & ULLONG_MAX + + +ROOT_TREE_OBJECTID = 1 +EXTENT_TREE_OBJECTID = 2 +CHUNK_TREE_OBJECTID = 3 +DEV_TREE_OBJECTID = 4 +FS_TREE_OBJECTID = 5 +ROOT_TREE_DIR_OBJECTID = 6 +CSUM_TREE_OBJECTID = 7 +QUOTA_TREE_OBJECTID = 8 +UUID_TREE_OBJECTID = 9 +FREE_SPACE_TREE_OBJECTID = 10 + +DEV_STATS_OBJECTID = 0 +BALANCE_OBJECTID = ULL(-4) +ORPHAN_OBJECTID = ULL(-5) +TREE_LOG_OBJECTID = ULL(-6) +TREE_LOG_FIXUP_OBJECTID = ULL(-7) +TREE_RELOC_OBJECTID = ULL(-8) +DATA_RELOC_TREE_OBJECTID = ULL(-9) +EXTENT_CSUM_OBJECTID = ULL(-10) +FREE_SPACE_OBJECTID = ULL(-11) +FREE_INO_OBJECTID = ULL(-12) +MULTIPLE_OBJECTIDS = ULL(-255) + +FIRST_FREE_OBJECTID = 256 +LAST_FREE_OBJECTID = ULL(-256) +FIRST_CHUNK_TREE_OBJECTID = 256 + +DEV_ITEMS_OBJECTID = 1 + +BTRFS_SYSTEM_CHUNK_ARRAY_SIZE = 2048 + + +INODE_ITEM_KEY = 1 +INODE_REF_KEY = 12 +INODE_EXTREF_KEY = 13 +XATTR_ITEM_KEY = 24 +ORPHAN_ITEM_KEY = 48 +DIR_LOG_ITEM_KEY = 60 +DIR_LOG_INDEX_KEY = 72 +DIR_ITEM_KEY = 84 +DIR_INDEX_KEY = 96 +EXTENT_DATA_KEY = 108 +EXTENT_CSUM_KEY = 128 +ROOT_ITEM_KEY = 132 +ROOT_BACKREF_KEY = 144 +ROOT_REF_KEY = 156 +EXTENT_ITEM_KEY = 168 +METADATA_ITEM_KEY = 169 +TREE_BLOCK_REF_KEY = 176 +EXTENT_DATA_REF_KEY = 178 +SHARED_BLOCK_REF_KEY = 182 +SHARED_DATA_REF_KEY = 184 +BLOCK_GROUP_ITEM_KEY = 192 +FREE_SPACE_INFO_KEY = 198 +FREE_SPACE_EXTENT_KEY = 199 +FREE_SPACE_BITMAP_KEY = 200 +DEV_EXTENT_KEY = 204 +DEV_ITEM_KEY = 216 +CHUNK_ITEM_KEY = 228 +QGROUP_STATUS_KEY = 240 +QGROUP_INFO_KEY = 242 +QGROUP_LIMIT_KEY = 244 +QGROUP_RELATION_KEY = 246 +BALANCE_ITEM_KEY = 248 +DEV_STATS_KEY = 249 +DEV_REPLACE_KEY = 250 +UUID_KEY_SUBVOL = 251 +UUID_KEY_RECEIVED_SUBVOL = 252 +STRING_ITEM_KEY = 253 + +BLOCK_GROUP_SINGLE = 0 +BLOCK_GROUP_DATA = 1 << 0 +BLOCK_GROUP_SYSTEM = 1 << 1 +BLOCK_GROUP_METADATA = 1 << 2 +BLOCK_GROUP_RAID0 = 1 << 3 +BLOCK_GROUP_RAID1 = 1 << 4 +BLOCK_GROUP_DUP = 1 << 5 +BLOCK_GROUP_RAID10 = 1 << 6 +BLOCK_GROUP_RAID5 = 1 << 7 +BLOCK_GROUP_RAID6 = 1 << 8 + +BLOCK_GROUP_TYPE_MASK = ( + BLOCK_GROUP_DATA | + BLOCK_GROUP_SYSTEM | + BLOCK_GROUP_METADATA +) + +BLOCK_GROUP_PROFILE_MASK = ( + BLOCK_GROUP_RAID0 | + BLOCK_GROUP_RAID1 | + BLOCK_GROUP_RAID5 | + BLOCK_GROUP_RAID6 | + BLOCK_GROUP_DUP | + BLOCK_GROUP_RAID10 +) + +AVAIL_ALLOC_BIT_SINGLE = 1 << 48 # used in balance_args +SPACE_INFO_GLOBAL_RSV = 1 << 49 + + +_block_group_flags_str_map = { + BLOCK_GROUP_DATA: 'DATA', + BLOCK_GROUP_METADATA: 'METADATA', + BLOCK_GROUP_SYSTEM: 'SYSTEM', + BLOCK_GROUP_RAID0: 'RAID0', + BLOCK_GROUP_RAID1: 'RAID1', + BLOCK_GROUP_DUP: 'DUP', + BLOCK_GROUP_RAID10: 'RAID10', + BLOCK_GROUP_RAID5: 'RAID5', + BLOCK_GROUP_RAID6: 'RAID6', +} + +_balance_args_profiles_str_map = { + BLOCK_GROUP_RAID0: 'RAID0', + BLOCK_GROUP_RAID1: 'RAID1', + BLOCK_GROUP_DUP: 'DUP', + BLOCK_GROUP_RAID10: 'RAID10', + BLOCK_GROUP_RAID5: 'RAID5', + BLOCK_GROUP_RAID6: 'RAID6', + AVAIL_ALLOC_BIT_SINGLE: 'SINGLE', +} + +QGROUP_LEVEL_SHIFT = 48 + +EXTENT_FLAG_DATA = 1 << 0 +EXTENT_FLAG_TREE_BLOCK = 1 << 1 +BLOCK_FLAG_FULL_BACKREF = 1 << 8 + +_extent_flags_str_map = { + EXTENT_FLAG_DATA: 'DATA', + EXTENT_FLAG_TREE_BLOCK: 'TREE_BLOCK', + BLOCK_FLAG_FULL_BACKREF: 'FULL_BACKREF', +} + +INODE_NODATASUM = 1 << 0 +INODE_NODATACOW = 1 << 1 +INODE_READONLY = 1 << 2 +INODE_NOCOMPRESS = 1 << 3 +INODE_PREALLOC = 1 << 4 +INODE_SYNC = 1 << 5 +INODE_IMMUTABLE = 1 << 6 +INODE_APPEND = 1 << 7 +INODE_NODUMP = 1 << 8 +INODE_NOATIME = 1 << 9 +INODE_DIRSYNC = 1 << 10 +INODE_COMPRESS = 1 << 11 + +_inode_flags_str_map = { + INODE_NODATASUM: 'NODATASUM', + INODE_READONLY: 'READONLY', + INODE_NOCOMPRESS: 'NOCOMPRESS', + INODE_PREALLOC: 'PREALLOC', + INODE_SYNC: 'SYNC', + INODE_IMMUTABLE: 'IMMUTABLE', + INODE_APPEND: 'APPEND', + INODE_NODUMP: 'NODUMP', + INODE_NOATIME: 'NOATIME', + INODE_DIRSYNC: 'DIRSYNC', + INODE_COMPRESS: 'COMPRESS', +} + +ROOT_SUBVOL_RDONLY = 1 << 0 + +_root_flags_str_map = { + ROOT_SUBVOL_RDONLY: 'RDONLY', +} + +FT_UNKNOWN = 0 +FT_REG_FILE = 1 +FT_DIR = 2 +FT_CHRDEV = 3 +FT_BLKDEV = 4 +FT_FIFO = 5 +FT_SOCK = 6 +FT_SYMLINK = 7 +FT_XATTR = 8 +FT_MAX = 9 + +_dir_item_type_str_map = { + FT_UNKNOWN: 'UNKNOWN', + FT_REG_FILE: 'FILE', + FT_DIR: 'DIR', + FT_CHRDEV: 'CHRDEV', + FT_BLKDEV: 'BLKDEV', + FT_FIFO: 'FIFO', + FT_SOCK: 'SOCK', + FT_SYMLINK: 'SYMLINK', + FT_XATTR: 'XATTR', +} + +COMPRESS_NONE = 0 +COMPRESS_ZLIB = 1 +COMPRESS_LZO = 2 +COMPRESS_ZSTD = 3 + +_compress_type_str_map = { + COMPRESS_NONE: 'none', + COMPRESS_ZLIB: 'zlib', + COMPRESS_LZO: 'lzo', + COMPRESS_ZSTD: 'zstd', +} + +FILE_EXTENT_INLINE = 0 +FILE_EXTENT_REG = 1 +FILE_EXTENT_PREALLOC = 2 + +_file_extent_type_str_map = { + FILE_EXTENT_INLINE: 'inline', + FILE_EXTENT_REG: 'regular', + FILE_EXTENT_PREALLOC: 'prealloc', +} + + +def qgroup_level(objectid): + return objectid >> QGROUP_LEVEL_SHIFT + + +def qgroup_subvid(objectid): + return objectid & ((1 << QGROUP_LEVEL_SHIFT) - 1) + + +_key_objectid_str_map = { + ROOT_TREE_OBJECTID: 'ROOT_TREE', + EXTENT_TREE_OBJECTID: 'EXTENT_TREE', + CHUNK_TREE_OBJECTID: 'CHUNK_TREE', + DEV_TREE_OBJECTID: 'DEV_TREE', + FS_TREE_OBJECTID: 'FS_TREE', + ROOT_TREE_DIR_OBJECTID: 'ROOT_TREE_DIR', + CSUM_TREE_OBJECTID: 'CSUM_TREE', + QUOTA_TREE_OBJECTID: 'QUOTA_TREE', + UUID_TREE_OBJECTID: 'UUID_TREE', + FREE_SPACE_TREE_OBJECTID: 'FREE_SPACE_TREE', + BALANCE_OBJECTID: 'BALANCE', + ORPHAN_OBJECTID: 'ORPHAN', + TREE_LOG_OBJECTID: 'TREE_LOG', + TREE_LOG_FIXUP_OBJECTID: 'TREE_LOG_FIXUP', + TREE_RELOC_OBJECTID: 'TREE_RELOC', + DATA_RELOC_TREE_OBJECTID: 'DATA_RELOC_TREE', + EXTENT_CSUM_OBJECTID: 'EXTENT_CSUM', + FREE_SPACE_OBJECTID: 'FREE_SPACE', + FREE_INO_OBJECTID: 'FREE_INO', + MULTIPLE_OBJECTIDS: 'MULTIPLE', +} + + +def key_objectid_str(objectid, _type): + if _type == DEV_EXTENT_KEY: + return str(objectid) + if _type == QGROUP_RELATION_KEY: + return "{}/{}".format(qgroup_level(objectid), qgroup_subvid(objectid)) + if _type == UUID_KEY_SUBVOL or _type == UUID_KEY_RECEIVED_SUBVOL: + return "0x{:0>16x}".format(objectid) + + if objectid == ROOT_TREE_OBJECTID and _type == DEV_ITEM_KEY: + return 'DEV_ITEMS' + if objectid == DEV_STATS_OBJECTID and _type == DEV_STATS_KEY: + return 'DEV_STATS' + if objectid == FIRST_CHUNK_TREE_OBJECTID and _type == CHUNK_ITEM_KEY: + return 'FIRST_CHUNK_TREE' + if objectid == ULLONG_MAX: + return '-1' + + return _key_objectid_str_map.get(objectid, str(objectid)) + + +_key_type_str_map = { + INODE_ITEM_KEY: 'INODE_ITEM', + INODE_REF_KEY: 'INODE_REF', + INODE_EXTREF_KEY: 'INODE_EXTREF', + XATTR_ITEM_KEY: 'XATTR_ITEM', + ORPHAN_ITEM_KEY: 'ORPHAN_ITEM', + DIR_LOG_ITEM_KEY: 'DIR_LOG_ITEM', + DIR_LOG_INDEX_KEY: 'DIR_LOG_INDEX', + DIR_ITEM_KEY: 'DIR_ITEM', + DIR_INDEX_KEY: 'DIR_INDEX', + EXTENT_DATA_KEY: 'EXTENT_DATA', + EXTENT_CSUM_KEY: 'EXTENT_CSUM', + ROOT_ITEM_KEY: 'ROOT_ITEM', + ROOT_BACKREF_KEY: 'ROOT_BACKREF', + ROOT_REF_KEY: 'ROOT_REF', + EXTENT_ITEM_KEY: 'EXTENT_ITEM', + METADATA_ITEM_KEY: 'METADATA_ITEM', + TREE_BLOCK_REF_KEY: 'TREE_BLOCK_REF', + EXTENT_DATA_REF_KEY: 'EXTENT_DATA_REF', + SHARED_BLOCK_REF_KEY: 'SHARED_BLOCK_REF', + SHARED_DATA_REF_KEY: 'SHARED_DATA_REF', + BLOCK_GROUP_ITEM_KEY: 'BLOCK_GROUP_ITEM', + FREE_SPACE_INFO_KEY: 'FREE_SPACE_INFO', + FREE_SPACE_EXTENT_KEY: 'FREE_SPACE_EXTENT', + FREE_SPACE_BITMAP_KEY: 'FREE_SPACE_BITMAP', + DEV_EXTENT_KEY: 'DEV_EXTENT', + DEV_ITEM_KEY: 'DEV_ITEM', + CHUNK_ITEM_KEY: 'CHUNK_ITEM', + QGROUP_STATUS_KEY: 'QGROUP_STATUS', + QGROUP_INFO_KEY: 'QGROUP_INFO', + QGROUP_LIMIT_KEY: 'QGROUP_LIMIT', + QGROUP_RELATION_KEY: 'QGROUP_RELATION', + BALANCE_ITEM_KEY: 'BALANCE_ITEM', + DEV_STATS_KEY: 'DEV_STATS', + DEV_REPLACE_KEY: 'DEV_REPLACE', + UUID_KEY_SUBVOL: 'UUID_SUBVOL', + UUID_KEY_RECEIVED_SUBVOL: 'RECEIVED_SUBVOL', + STRING_ITEM_KEY: 'STRING_ITEM', +} + +# === Helper functions + +def key_type_str(_type): + return _key_type_str_map.get(_type, str(_type)) + + +def key_offset_str(offset, _type): + if _type == QGROUP_RELATION_KEY or _type == QGROUP_INFO_KEY or _type == QGROUP_LIMIT_KEY: + return "{}/{}".format(qgroup_level(offset), qgroup_subvid(offset)) + if _type == UUID_KEY_SUBVOL or _type == UUID_KEY_RECEIVED_SUBVOL: + return "0x{:0>16x}".format(offset) + if _type == ROOT_ITEM_KEY: + return _key_objectid_str_map.get(offset, str(offset)) + if offset == ULLONG_MAX: + return '-1' + + return str(offset) + + +def flags_str(flags, flags_str_map): + ret = [] + for flag in sorted(flags_str_map.keys()): + if flags & flag: + ret.append(flags_str_map[flag]) + if len(ret) == 0: + ret.append("none") + return '|'.join(ret) + + +def embedded_text_for_str(text): + try: + return "utf-8 {}".format(text.decode('utf-8')) + except UnicodeDecodeError: + return "raw {}".format(repr(text)) + + +# === Basic structures + + +class TimeSpec(object): + sstruct = struct.Struct('<QL') + + @staticmethod + def from_values(sec, nsec): + t = TimeSpec.__new__(TimeSpec) + t.sec = sec + t.nsec = nsec + return t + + def __init__(self, data): + self.sec, self.nsec = TimeSpec.sstruct.unpack_from(data) + + @property + def iso8601(self): + return datetime.datetime.utcfromtimestamp( + float("{self.sec}.{self.nsec}".format(self=self)) + ).isoformat() + + def __str__(self): + return "{self.sec}.{self.nsec} ({self.iso8601})".format(self=self) + + +class Key(object): + def __init__(self, objectid, _type, offset): + self._objectid = objectid + self._type = _type + self._offset = offset + self._pack() + + @property + def objectid(self): + return self._objectid + + @objectid.setter + def objectid(self, _objectid): + self._objectid = _objectid + self._pack() + + @property + def type(self): + return self._type + + @type.setter + def type(self, _type): + self._type = _type + self._pack() + + @property + def offset(self): + return self._offset + + @offset.setter + def offset(self, _offset): + self._offset = _offset + self._pack() + + @property + def key(self): + return self._key + + @key.setter + def key(self, _key): + self._key = _key + self._unpack() + + def _pack(self): + self._key = (self.objectid << 72) + (self._type << 64) + self.offset + + def _unpack(self): + self._objectid = self._key >> 72 + self._type = (self._key & ((1 << 72) - 1)) >> 64 + self._offset = (self._key & ((1 << 64) - 1)) + + def __lt__(self, other): + if isinstance(other, Key): + return self._key < other._key + return self._key < other + + def __le__(self, other): + if isinstance(other, Key): + return self._key <= other._key + return self._key <= other + + def __eq__(self, other): + if isinstance(other, Key): + return self._key == other._key + return self._key == other + + def __ge__(self, other): + if isinstance(other, Key): + return self._key >= other._key + return self._key >= other + + def __gt__(self, other): + if isinstance(other, Key): + return self._key > other._key + return self._key > other + + def __str__(self): + return "({} {} {})".format( + key_objectid_str(self._objectid, self._type), + key_type_str(self._type), + key_offset_str(self._offset, self._type), + ) + + def __add__(self, amount): + new_key = copy.copy(self) + new_key.key += amount + return new_key + + def __sub__(self, amount): + new_key = copy.copy(self) + new_key.key -= amount + return new_key + +class DiskKey(Key): + sstruct = struct.Struct('<QBQ') + + def __init__(self, data): + super(DiskKey, self).__init__(*DiskKey.sstruct.unpack_from(data)) + +class InnerKey(Key): + sstruct = struct.Struct('<QBQQQ') + + def __init__(self, data): + unpacked_data = InnerKey.sstruct.unpack_from(data) + super().__init__(*unpacked_data[:3]) + self.block_num = unpacked_data[3] + self.generation = unpacked_data[4] + + def __str__(self): + return "(inner_key {} {} {} block_num {}, generation {})".format( + key_objectid_str(self._objectid, self._type), + key_type_str(self._type), + key_offset_str(self._offset, self._type), + self.block_num, + self.generation, + ) + +class LeafKey(Key): + sstruct = struct.Struct('<QBQLL') + + def __init__(self, data): + unpacked_data = LeafKey.sstruct.unpack_from(data) + super().__init__(*unpacked_data[:3]) + self.data_offset = unpacked_data[3] + self.data_size = unpacked_data[4] + + def __str__(self): + return "(leaf_key {} {} {} data_offset {:#x} data_size {})".format( + key_objectid_str(self._objectid, self._type), + key_type_str(self._type), + key_offset_str(self._offset, self._type), + self.data_offset, + self.data_size, + ) + +class ItemData(object): + def __init__(self, key): + self.key = key + + def setattr_from_key(self, objectid_attr=None, type_attr=None, offset_attr=None): + if objectid_attr is not None: + setattr(self, objectid_attr, self.key.objectid) + if type_attr is not None: + setattr(self, type_attr, self.key.type) + if offset_attr is not None: + setattr(self, offset_attr, self.key.offset) + self._key_attrs = objectid_attr, type_attr, offset_attr + + @property + def key_attrs(self): + try: + return self._key_attrs + except AttributeError: + return None, None, None + + def __lt__(self, other): + return self.key < other.key + + +superblock = struct.Struct('<32x16s2Q8s9Q5L4QH2B611x2048s') +# NOTE: the structure is not complete +# FS UUID +# Physical block address +# Flags +# Signature (_BHRfS_M) +# generation +# Log. address of root of tree roots +# Log. address of chunk tree root +# Log. address of log tree root +# log_root_transid +# total_bytes +# bytes_used +# root_dir_objectid (usually 6) +# num_devices +# sectorsize +# nodesize +# __unused_leafsize +# stripesize +# sys_chunk_array_size +# chunk_root_generation +# compat_flags +# compat_ro_flags +# incompat_flags +# csum_type +# root_level 23 +# chunk_root_level 24 +# --- +# sys_chunk_array + + +_node_header_struct = struct.Struct('<32x16sQQ16sQQLB') +NodeHeader = namedtuple('NodeHeader', 'FS_UUID node_addr flags chunk_tree_uuid generation tree_id items_num level') + +# === Items + +class InodeItem(ItemData): + _inode_item = [ + struct.Struct('<5Q4L3Q32x'), + TimeSpec.sstruct, + TimeSpec.sstruct, + TimeSpec.sstruct, + TimeSpec.sstruct, + ] + sstruct = struct.Struct('<' + ''.join([s.format[1:].decode() for s in _inode_item])) + + def __init__(self, key, data): + super().__init__(key) + self.generation, self.transid, self.size, self.nbytes, self.block_group, \ + self.nlink, self.uid, self.gid, self.mode, self.rdev, self.flags, self.sequence = \ + InodeItem._inode_item[0].unpack_from(data) + pos = InodeItem._inode_item[0].size + next_pos = pos + TimeSpec.sstruct.size + self.atime = TimeSpec(data[pos:next_pos]) + pos, next_pos = next_pos, next_pos + TimeSpec.sstruct.size + self.ctime = TimeSpec(data[pos:next_pos]) + pos, next_pos = next_pos, next_pos + TimeSpec.sstruct.size + self.mtime = TimeSpec(data[pos:next_pos]) + pos, next_pos = next_pos, next_pos + TimeSpec.sstruct.size + self.otime = TimeSpec(data[pos:next_pos]) + + @property + def flags_str(self): + return flags_str(self.flags, _inode_flags_str_map) + + def __str__(self): + return "inode generation {self.generation} transid {self.transid} size {self.size} " \ + "nbytes {self.nbytes} block_group {self.block_group} mode {self.mode:05o} " \ + "nlink {self.nlink} uid {self.uid} gid {self.gid} rdev {self.rdev} " \ + "flags {self.flags:#x}({self.flags_str})".format(self=self) + + +class RootItem(ItemData): + _root_item = [ + InodeItem.sstruct, + struct.Struct('<7QL'), + DiskKey.sstruct, + struct.Struct('<BBQ16s16s16s4Q'), + TimeSpec.sstruct, + TimeSpec.sstruct, + TimeSpec.sstruct, + TimeSpec.sstruct, + ] + sstruct = struct.Struct('<' + ''.join([s.format[1:].decode() for s in _root_item])) + + def __init__(self, key, data): + super().__init__(key) + self.inode = InodeItem(None, data[:InodeItem.sstruct.size]) + pos = InodeItem.sstruct.size + self.generation, self.dirid, self.bytenr, self.byte_limit, self.bytes_used, \ + self.last_snapshot, self.flags, self.refs = \ + RootItem._root_item[1].unpack_from(data, pos) + pos += RootItem._root_item[1].size + self.drop_progress = DiskKey(data[pos:pos+DiskKey.sstruct.size]) + pos += DiskKey.sstruct.size + self.drop_level, self.level, self.generation_v2, uuid_bytes, parent_uuid_bytes, \ + received_uuid_bytes, self.ctransid, self.otransid, self.stransid, self.rtransid = \ + RootItem._root_item[3].unpack_from(data, pos) + self.uuid = uuid.UUID(bytes=uuid_bytes) + self.parent_uuid = uuid.UUID(bytes=parent_uuid_bytes) + self.received_uuid = uuid.UUID(bytes=received_uuid_bytes) + pos += RootItem._root_item[3].size + next_pos = pos + TimeSpec.sstruct.size + self.ctime = TimeSpec(data[pos:next_pos]) + pos, next_pos = next_pos, next_pos + TimeSpec.sstruct.size + self.otime = TimeSpec(data[pos:next_pos]) + pos, next_pos = next_pos, next_pos + TimeSpec.sstruct.size + self.stime = TimeSpec(data[pos:next_pos]) + pos, next_pos = next_pos, next_pos + TimeSpec.sstruct.size + self.rtime = TimeSpec(data[pos:next_pos]) + + @property + def flags_str(self): + return flags_str(self.flags, _root_flags_str_map) + + def __str__(self): + return "root {self.key.objectid} uuid {self.uuid} " \ + "generation {self.generation} last_snapshot {self.last_snapshot} " \ + "bytenr {self.bytenr:#x} level {self.level} " \ + "flags {self.flags:#x}({self.flags_str})".format(self=self) + + +class Chunk(ItemData): + sstruct = struct.Struct('<4Q3L2H') + + def __init__(self, key, data): + super().__init__(key) + self.setattr_from_key(offset_attr='vaddr') + self.length, self.owner, self.stripe_len, self.type, self.io_align, \ + self.io_width, self.sector_size, self.num_stripes, self.sub_stripes = \ + Chunk.sstruct.unpack_from(data) + self.stripes = [] + pos = Chunk.sstruct.size + for i in range(self.num_stripes): + next_pos = pos + Stripe.sstruct.size + self.stripes.append(Stripe(data[pos:next_pos])) + pos = next_pos + + @property + def size(self): + return Chunk.sstruct.size + self.num_stripes * Stripe.sstruct.size + + @property + def type_str(self): + return flags_str(self.type, _block_group_flags_str_map) + + def __str__(self): + return "chunk vaddr {self.vaddr:#x} type {self.type_str} length {self.length} " \ + "num_stripes {self.num_stripes}".format(self=self) + + +class Stripe(object): + sstruct = struct.Struct('<2Q16s') + + def __init__(self, data): + self.devid, self.offset, uuid_bytes = Stripe.sstruct.unpack(data) + self.uuid = uuid.UUID(bytes=uuid_bytes) + + def __str__(self): + return "stripe devid {self.devid} offset {self.offset:#x}".format(self=self) + + +class InodeRefList(ItemData, collections.abc.MutableSequence): + def __init__(self, header, data): + super().__init__(header) + self._list = [] + pos = 0 + while pos < header.len: + inode_ref = InodeRef(data, pos) + self._list.append(inode_ref) + pos += len(inode_ref) + + def __getitem__(self, index): + return self._list[index] + + def __setitem__(self, index, value): + self._list[index] = value + + def __delitem__(self, index): + del self._list[index] + + def __len__(self): + return len(self._list) + + def insert(self, index, value): + self._list.insert(index, value) + + def __str__(self): + return "inode ref list size {}".format(len(self)) + + +class InodeRef(ItemData): + sstruct = struct.Struct('<QH') + + def __init__(self, key, data): + super().__init__(key) + self.index, self.name_len = InodeRef.sstruct.unpack_from(data) + self.name, = struct.Struct('<{}s'.format(self.name_len)).unpack_from(data, InodeRef.sstruct.size) + self._len = InodeRef.sstruct.size + self.name_len + + @property + def name_str(self): + return embedded_text_for_str(self.name) + + def __len__(self): + return self._len + + def __str__(self): + return "inode ref index {self.index} name {self.name_str}".format(self=self) + + +class DirItemList(ItemData, collections.abc.MutableSequence): + def __init__(self, key, data): + super().__init__(key) + self._list = [] + pos = 0 + while pos < key.data_size: + cls = {DIR_ITEM_KEY: DirItem, XATTR_ITEM_KEY: XAttrItem} + dir_item = cls[self.key.type](data, pos) + self._list.append(dir_item) + pos += len(dir_item) + + def __getitem__(self, index): + return self._list[index] + + def __setitem__(self, index, value): + self._list[index] = value + + def __delitem__(self, index): + del self._list[index] + + def __len__(self): + return len(self._list) + + def insert(self, index, value): + self._list.insert(index, value) + + def __str__(self): + return "dir item list hash {self.key.offset} size {}".format(len(self), self=self) + + +class XAttrItemList(DirItemList): + def __str__(self): + return "xattr item list hash {self.key.offset} size {}".format(len(self), self=self) + + +class DirItem(object): + _dir_item = [ + DiskKey.sstruct, + struct.Struct('<QHHB') + ] + sstruct = struct.Struct('<' + ''.join([s.format[1:].decode() for s in _dir_item])) + + def __init__(self, data, pos): + next_pos = pos + DiskKey.sstruct.size + self.location = DiskKey(data[pos:next_pos]) + pos = next_pos + self.transid, self.data_len, self.name_len, self.type = \ + DirItem._dir_item[1].unpack_from(data, pos) + pos += DirItem._dir_item[1].size + self.name, = struct.Struct('<{}s'.format(self.name_len)).unpack_from(data, pos) + pos += self.name_len + self.data, = struct.Struct('<{}s'.format(self.data_len)).unpack_from(data, pos) + pos += self.data_len + self._len = DirItem.sstruct.size + self.name_len + self.data_len + + @property + def type_str(self): + return _dir_item_type_str_map[self.type] + + @property + def name_str(self): + return embedded_text_for_str(self.name) + + @property + def data_str(self): + return embedded_text_for_str(self.data) + + def __len__(self): + return self._len + + def __str__(self): + return "dir item location {self.location} type {self.type_str} " \ + "name {self.name_str}".format(self=self) + + +class XAttrItem(DirItem): + def __str__(self): + return "xattr item name {self.name_str} data {self.data_str}".format(self=self) + + +class DirIndex(ItemData): + def __init__(self, header, data): + super().__init__(header) + self.location = DiskKey(data[:DiskKey.sstruct.size]) + pos = DiskKey.sstruct.size + self.transid, self.data_len, self.name_len, self.type = \ + DirItem._dir_item[1].unpack_from(data, pos) + pos += DirItem._dir_item[1].size + self.name, = struct.Struct('<{}s'.format(self.name_len)).unpack_from(data, pos) + + @property + def type_str(self): + return _dir_item_type_str_map[self.type] + + @property + def name_str(self): + return embedded_text_for_str(self.name) + + def __str__(self): + return "dir index {self.key.offset} location {self.location} type {self.type_str} " \ + "name {self.name_str}".format(self=self) + + +class FileExtentItem(ItemData): + _file_extent_item = [ + struct.Struct('<QQBB2xB'), + struct.Struct('<4Q'), + ] + sstruct = struct.Struct('<' + ''.join([s.format[1:].decode() + for s in _file_extent_item])) + + def __init__(self, key, data): + super().__init__(key) + self.logical_offset = key.offset + self.generation, self.ram_bytes, self.compression, self.encryption, self.type = \ + FileExtentItem._file_extent_item[0].unpack_from(data) + if self.type != FILE_EXTENT_INLINE: + # These are confusing, so they deserve a comment in the code: + # (disk_bytenr EXTENT_ITEM disk_num_bytes) is the tree key of + # the extent item storing the actual data. + # + # The third one, offset is the offset inside that extent where the + # data we need starts. num_bytes is the amount of bytes to be used + # from that offset onwards. + # + # Remember that these numbers always be multiples of disk block + # sizes, because that's how it gets cowed. We don't just use 1 or 2 + # bytes from another extent. + pos = FileExtentItem._file_extent_item[0].size + self.disk_bytenr, self.disk_num_bytes, self.offset, self.num_bytes = \ + FileExtentItem._file_extent_item[1].unpack_from(data, pos) + else: + self._inline_encoded_nbytes = key.data_size - FileExtentItem._file_extent_item[0].size + + @property + def compression_str(self): + return _compress_type_str_map.get(self.compression, 'unknown') + + @property + def type_str(self): + return _file_extent_type_str_map.get(self.type, 'unknown') + + def __str__(self): + ret = ["extent data at {self.logical_offset} generation {self.generation} " + "ram_bytes {self.ram_bytes} " + "compression {self.compression_str} type {self.type_str}".format(self=self)] + if self.type != FILE_EXTENT_INLINE: + ret.append("disk_bytenr {self.disk_bytenr} disk_num_bytes {self.disk_num_bytes} " + "offset {self.offset} num_bytes {self.num_bytes}".format(self=self)) + else: + ret.append("inline_encoded_nbytes {self._inline_encoded_nbytes}".format(self=self)) + return ' '.join(ret) + + +class ExtentItem(ItemData): + sstruct = struct.Struct('<3Q') + extent_inline_ref = struct.Struct('<BQ') + + def __init__(self, header, data, load_data_refs=True, load_metadata_refs=True): + super().__init__(header) + self.setattr_from_key(objectid_attr='vaddr', offset_attr='length') + pos = 0 + self.refs, self.generation, self.flags = ExtentItem.sstruct.unpack_from(data, pos) + pos += ExtentItem.sstruct.size + if self.flags == EXTENT_FLAG_DATA and load_data_refs: + self.extent_data_refs = [] + self.shared_data_refs = [] + while pos < len(data): + inline_ref_type, inline_ref_offset = \ + ExtentItem.extent_inline_ref.unpack_from(data, pos) + if inline_ref_type == EXTENT_DATA_REF_KEY: + pos += 1 + next_pos = pos + InlineExtentDataRef.sstruct.size + self.extent_data_refs.append(InlineExtentDataRef(data[pos:next_pos])) + pos = next_pos + elif inline_ref_type == SHARED_DATA_REF_KEY: + pos += 1 + next_pos = pos + InlineSharedDataRef.inline_shared_data_ref.size + self.shared_data_refs.append(InlineSharedDataRef(data[pos:next_pos])) + pos = next_pos + elif self.flags & EXTENT_FLAG_TREE_BLOCK and load_metadata_refs: + next_pos = pos + TreeBlockInfo.tree_block_info.size + self.tree_block_info = TreeBlockInfo(data[pos:next_pos]) + pos = next_pos + self.tree_block_refs = [] + self.shared_block_refs = [] + while pos < len(data): + inline_ref_type, inline_ref_offset = \ + ExtentItem.extent_inline_ref.unpack_from(data, pos) + if inline_ref_type == TREE_BLOCK_REF_KEY: + self.tree_block_refs.append(InlineTreeBlockRef(inline_ref_offset)) + elif inline_ref_type == SHARED_BLOCK_REF_KEY: + self.shared_block_refs.append(InlineSharedBlockRef(inline_ref_offset)) + else: + raise Exception("BUG: expected inline TREE_BLOCK_REF or SHARED_BLOCK_REF_KEY " + "but got inline_ref_type {}".format(inline_ref_type)) + pos += ExtentItem.extent_inline_ref.size + + def append_extent_data_ref(self, ref): + self.extent_data_refs.append(ref) + + def append_shared_data_ref(self, ref): + self.shared_data_refs.append(ref) + + def append_tree_block_ref(self, ref): + self.tree_block_refs.append(ref) + + def append_shared_block_ref(self, ref): + self.shared_block_refs.append(ref) + + @property + def flags_str(self): + return flags_str(self.flags, _extent_flags_str_map) + + def __str__(self): + return "extent vaddr {self.vaddr} length {self.length} refs {self.refs} " \ + "gen {self.generation} flags {self.flags_str}".format(self=self) + + +class ExtentDataRef(ItemData): + sstruct = struct.Struct('<3QL') + + def __init__(self, header, data): + super().__init__(header) + self.root, self.objectid, self.offset, self.count = \ + ExtentDataRef.sstruct.unpack(data) + + def __str__(self): + return "extent data backref root {self.root} objectid {self.objectid} " \ + "offset {self.offset} count {self.count}".format(self=self) + + +class InlineExtentDataRef(ExtentDataRef): + sstruct = ExtentDataRef.sstruct + + def __init__(self, data): + self.root, self.objectid, self.offset, self.count = \ + InlineExtentDataRef.sstruct.unpack(data) + + def __str__(self): + return "inline extent data backref root {self.root} objectid {self.objectid} " \ + "offset {self.offset} count {self.count}".format(self=self) + + +class SharedDataRef(ItemData): + sstruct = struct.Struct('<L') + + def __init__(self, header, data): + super().__init__(header) + self.setattr_from_key(offset_attr='parent') + self.count, = SharedDataRef.sstruct.unpack(data) + + def __str__(self): + return "shared data backref parent {self.parent} count {self.count}".format(self=self) + + +class InlineSharedDataRef(SharedDataRef): + sstruct = struct.Struct('<QL') + + def __init__(self, data): + self.parent, self.count = InlineSharedDataRef.sstruct.unpack(data) + + def __str__(self): + return "inline shared data backref parent {self.parent} " \ + "count {self.count}".format(self=self) + + +class TreeBlockInfo(object): + sstruct = struct.Struct('<QBQB') + + def __init__(self, data): + tb_objectid, tb_type, tb_offset, self.level = \ + TreeBlockInfo.sstruct.unpack(data) + self.key = Key(tb_objectid, tb_type, tb_offset) + + def __str__(self): + return "tree block key {self.key} level {self.level}".format(self=self) + +class TreeBlockRef(ItemData): + def __init__(self, header): + super().__init__(header) + self.setattr_from_key(offset_attr='root') + + def __str__(self): + return "tree block backref root {}".format(key_objectid_str(self.root, None)) + + +class InlineTreeBlockRef(TreeBlockRef): + def __init__(self, root): + self.root = root + + def __str__(self): + return "inline tree block backref root {}".format(key_objectid_str(self.root, None)) + + +class SharedBlockRef(ItemData): + def __init__(self, header): + super().__init__(header) + self.setattr_from_key(offset_attr='parent') + + def __str__(self): + return "shared block backref parent {}".format(self.parent) + + +class InlineSharedBlockRef(SharedBlockRef): + def __init__(self, parent): + self.parent = parent + + def __str__(self): + return "inline shared block backref parent {}".format(self.parent) + +# === Main FileSystem class + +def key_bin_search(fd, base_offset, item_size, cmp_item, min, max): + low = min + high = max + + while low < high: + mid = (low + high) // 2 + offset = base_offset + mid * item_size + + fd.seek(offset) + key1 = DiskKey(fd.read(item_size)) + if key1 > cmp_item: + high = mid + elif key1 < cmp_item: + low = mid + 1 + else: + return True, mid + + return False, low + + +chunk_map_item = namedtuple('chunk_map_item', 'logical physical length devid') + + +class FileSystem(object): + def __init__(self, path, part_offset): + self._chunk_map = OrderedDict() + self.path = path + self.part_offset = part_offset + self.fd = open(path, 'rb') + self.fd.seek(part_offset + 0x10000) # going to superblock + + sb_bytes = self.fd.read(superblock.size) + sb_tuple = superblock.unpack(sb_bytes) + + if sb_tuple[3] != b'_BHRfS_M': + raise "No signature found" + + # setting base FS information + self.fsid = sb_tuple[0] + self.nodesize = sb_tuple[14] + self.sectorsize = sb_tuple[13] + + self._chunk_root = sb_tuple[6] + self._chunk_root_level = sb_tuple[24] + self._tree_roots_root = sb_tuple[5] + self._tree_roots_root_level = sb_tuple[23] + + # setting chunk map + sys_chunk_array_size = sb_tuple[17] + sys_chunk = sb_tuple[25][:sys_chunk_array_size] + + pos = 0 + while pos < sys_chunk_array_size: + key = DiskKey(sys_chunk[pos:]) + pos += DiskKey.sstruct.size + chunk = Chunk(key, sys_chunk[pos:]) + for st in chunk.stripes: + self._insert_chunk(chunk_map_item(chunk.vaddr, st.offset, chunk.length, st.devid)) + pos += chunk.size + + # setting tree roots + _, fs_tree_root_item = self.search_tree(self._tree_roots_root_level, self._tree_roots_root, Key(FS_TREE_OBJECTID, ROOT_ITEM_KEY, 0)) + _, extent_tree_root_item = self.search_tree(self._tree_roots_root_level, self._tree_roots_root, Key(EXTENT_TREE_OBJECTID, ROOT_ITEM_KEY, 0)) + self._fs_root_level = fs_tree_root_item.level + self._fs_root = fs_tree_root_item.bytenr + self._extent_root_level = extent_tree_root_item.level + self._extent_root = extent_tree_root_item.bytenr + + @property + def chunk_root(self): + return self._chunk_root_level, self._chunk_root + + @property + def tree_roots_root(self): + return self._tree_roots_root_level, self._tree_roots_root + + @property + def fs_root(self): + return self._fs_root_level, self._fs_root + + @property + def extent_root(self): + return self._extent_root_level, self._extent_root + + def logical_to_physical(self, log): + cur_logical = next(iter(self._chunk_map)) # first item + + for logical, cmi in self._chunk_map.items(): + if logical > log: + break + cur_logical = logical + + # if there is no address in chunk_map, searching in chunk_tree + if cur_logical + self._chunk_map[cur_logical].length < log: + def process_func(header, offset): + for i in range(header.items_num): + self.fd.seek(offset + i * LeafKey.sstruct.size) + k = LeafKey(self.fd.read(LeafKey.sstruct.size)) + self.fd.seek(offset + k.data_offset) + if k.type == CHUNK_ITEM_KEY: + item = _key_type_class_map[k.type](k, self.fd.read(k.data_size)) + for st in item.stripes: + self._insert_chunk(chunk_map_item(item.vaddr, st.offset, item.length, st.devid)) + + self.search_tree(self._chunk_root_level, self._chunk_root, Key(FIRST_CHUNK_TREE_OBJECTID, CHUNK_ITEM_KEY, log), process_func) + + cur_logical = next(iter(self._chunk_map)) # first item + if cur_logical > log: + raise Exception(f'Cannot translate address {log:#x}') + + for logical, cmi in self._chunk_map.items(): + if logical > log: + break + cur_logical = logical + + if cur_logical + self._chunk_map[cur_logical].length < log: + raise Exception(f'Cannot translate address {log:#x}') + + print('address translation: {:#x} -> {:#x}'.format(log, self._chunk_map[cur_logical].physical + log - cur_logical)) + return self.part_offset + self._chunk_map[cur_logical].physical + log - cur_logical + + def search_tree(self, level, root_offset, key, process_node_func = None): + for lvl in range(level, 0, -1): + # inner node + root_offset = self.logical_to_physical(root_offset) + self.fd.seek(root_offset) + header = NodeHeader._make(_node_header_struct.unpack(self.fd.read(_node_header_struct.size))) + if header.level != lvl: + raise Exception('Invalid inner node level') + + found, itemnr = key_bin_search( + self.fd, + root_offset + _node_header_struct.size, + InnerKey.sstruct.size, + key, + 0, + header.items_num + ) + + # TODO: better understand this + if not found and itemnr > 0: + itemnr -= 1 + + self.fd.seek(root_offset + _node_header_struct.size + itemnr * InnerKey.sstruct.size) + k = InnerKey(self.fd.read(InnerKey.sstruct.size)) + root_offset = k.block_num + else: + # we are in leaf node + root_offset = self.logical_to_physical(root_offset) + self.fd.seek(root_offset) + header = NodeHeader._make(_node_header_struct.unpack(self.fd.read(_node_header_struct.size))) + if header.level != 0: + raise Exception('Invalid leaf level') + + if process_node_func: + process_node_func(header, root_offset + _node_header_struct.size) + return root_offset + + found, itemnr = key_bin_search( + self.fd, + root_offset + _node_header_struct.size, + LeafKey.sstruct.size, + key, + 0, + header.items_num + ) + + self.fd.seek(root_offset + _node_header_struct.size + itemnr * LeafKey.sstruct.size) + k = LeafKey(self.fd.read(LeafKey.sstruct.size)) + self.fd.seek(root_offset + _node_header_struct.size + k.data_offset) + + if k.type in _key_type_class_map: + return k, _key_type_class_map[k.type](k, self.fd.read(k.data_size)) + else: + return k, False + + def print_node(self, header, offset): + print(header) + root_paddr = self.logical_to_physical(header.node_addr) + key_size = InnerKey.sstruct.size if header.level > 0 else LeafKey.sstruct.size + key_struct = InnerKey if header.level > 0 else LeafKey + for i in range(header.items_num): + self.fd.seek(root_paddr + _node_header_struct.size + i * key_size) + k = key_struct(self.fd.read(key_size)) + print(k) + self.fd.seek(root_paddr + _node_header_struct.size + k.data_offset) + if k.type in _key_type_class_map and header.level == 0: + item = _key_type_class_map[k.type](k, self.fd.read(k.data_size)) + print(item) + if k.type == DIR_ITEM_KEY: + for it in item: + print(it) + print('============================') + + def print_chunk_map(self): + print('=== chunk map ===') + for logical, cmi in self._chunk_map.items(): + print(f'{cmi.logical:#x}..{cmi.logical+cmi.length:#x} -> {cmi.physical:#x}..{cmi.physical+cmi.length:#x}') + print('=================') + + def _insert_chunk(self, chunk): + if not chunk.logical in self._chunk_map: + cm = dict(self._chunk_map) + cm[chunk.logical] = chunk + self._chunk_map = OrderedDict(sorted(cm.items())) + + +_key_type_class_map = { + INODE_ITEM_KEY: InodeItem, + INODE_REF_KEY: InodeRef, + DIR_ITEM_KEY: DirItemList, + DIR_INDEX_KEY: DirIndex, + EXTENT_DATA_KEY: FileExtentItem, + ROOT_ITEM_KEY: RootItem, + EXTENT_ITEM_KEY: ExtentItem, + CHUNK_ITEM_KEY: Chunk, +} diff --git a/modules/rosapps/applications/devutils/btrfstools/crc32c.py b/modules/rosapps/applications/devutils/btrfstools/crc32c.py new file mode 100644 index 0000000000..0bb00dc828 --- /dev/null +++ b/modules/rosapps/applications/devutils/btrfstools/crc32c.py @@ -0,0 +1,105 @@ +# Copyright (C) 2017 Hans van Kranenburg <h...@knorrie.org> +# +# This file is part of the python-btrfs module. +# +# This program is free software; you can redistribute it and/or +# modify it under the terms of the GNU General Public +# License v2 as published by the Free Software Foundation. +# +# 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 + +table = ( + 0x00000000, 0xf26b8303, 0xe13b70f7, 0x1350f3f4, + 0xc79a971f, 0x35f1141c, 0x26a1e7e8, 0xd4ca64eb, + 0x8ad958cf, 0x78b2dbcc, 0x6be22838, 0x9989ab3b, + 0x4d43cfd0, 0xbf284cd3, 0xac78bf27, 0x5e133c24, + 0x105ec76f, 0xe235446c, 0xf165b798, 0x030e349b, + 0xd7c45070, 0x25afd373, 0x36ff2087, 0xc494a384, + 0x9a879fa0, 0x68ec1ca3, 0x7bbcef57, 0x89d76c54, + 0x5d1d08bf, 0xaf768bbc, 0xbc267848, 0x4e4dfb4b, + 0x20bd8ede, 0xd2d60ddd, 0xc186fe29, 0x33ed7d2a, + 0xe72719c1, 0x154c9ac2, 0x061c6936, 0xf477ea35, + 0xaa64d611, 0x580f5512, 0x4b5fa6e6, 0xb93425e5, + 0x6dfe410e, 0x9f95c20d, 0x8cc531f9, 0x7eaeb2fa, + 0x30e349b1, 0xc288cab2, 0xd1d83946, 0x23b3ba45, + 0xf779deae, 0x05125dad, 0x1642ae59, 0xe4292d5a, + 0xba3a117e, 0x4851927d, 0x5b016189, 0xa96ae28a, + 0x7da08661, 0x8fcb0562, 0x9c9bf696, 0x6ef07595, + 0x417b1dbc, 0xb3109ebf, 0xa0406d4b, 0x522bee48, + 0x86e18aa3, 0x748a09a0, 0x67dafa54, 0x95b17957, + 0xcba24573, 0x39c9c670, 0x2a993584, 0xd8f2b687, + 0x0c38d26c, 0xfe53516f, 0xed03a29b, 0x1f682198, + 0x5125dad3, 0xa34e59d0, 0xb01eaa24, 0x42752927, + 0x96bf4dcc, 0x64d4cecf, 0x77843d3b, 0x85efbe38, + 0xdbfc821c, 0x2997011f, 0x3ac7f2eb, 0xc8ac71e8, + 0x1c661503, 0xee0d9600, 0xfd5d65f4, 0x0f36e6f7, + 0x61c69362, 0x93ad1061, 0x80fde395, 0x72966096, + 0xa65c047d, 0x5437877e, 0x4767748a, 0xb50cf789, + 0xeb1fcbad, 0x197448ae, 0x0a24bb5a, 0xf84f3859, + 0x2c855cb2, 0xdeeedfb1, 0xcdbe2c45, 0x3fd5af46, + 0x7198540d, 0x83f3d70e, 0x90a324fa, 0x62c8a7f9, + 0xb602c312, 0x44694011, 0x5739b3e5, 0xa55230e6, + 0xfb410cc2, 0x092a8fc1, 0x1a7a7c35, 0xe811ff36, + 0x3cdb9bdd, 0xceb018de, 0xdde0eb2a, 0x2f8b6829, + 0x82f63b78, 0x709db87b, 0x63cd4b8f, 0x91a6c88c, + 0x456cac67, 0xb7072f64, 0xa457dc90, 0x563c5f93, + 0x082f63b7, 0xfa44e0b4, 0xe9141340, 0x1b7f9043, + 0xcfb5f4a8, 0x3dde77ab, 0x2e8e845f, 0xdce5075c, + 0x92a8fc17, 0x60c37f14, 0x73938ce0, 0x81f80fe3, + 0x55326b08, 0xa759e80b, 0xb4091bff, 0x466298fc, + 0x1871a4d8, 0xea1a27db, 0xf94ad42f, 0x0b21572c, + 0xdfeb33c7, 0x2d80b0c4, 0x3ed04330, 0xccbbc033, + 0xa24bb5a6, 0x502036a5, 0x4370c551, 0xb11b4652, + 0x65d122b9, 0x97baa1ba, 0x84ea524e, 0x7681d14d, + 0x2892ed69, 0xdaf96e6a, 0xc9a99d9e, 0x3bc21e9d, + 0xef087a76, 0x1d63f975, 0x0e330a81, 0xfc588982, + 0xb21572c9, 0x407ef1ca, 0x532e023e, 0xa145813d, + 0x758fe5d6, 0x87e466d5, 0x94b49521, 0x66df1622, + 0x38cc2a06, 0xcaa7a905, 0xd9f75af1, 0x2b9cd9f2, + 0xff56bd19, 0x0d3d3e1a, 0x1e6dcdee, 0xec064eed, + 0xc38d26c4, 0x31e6a5c7, 0x22b65633, 0xd0ddd530, + 0x0417b1db, 0xf67c32d8, 0xe52cc12c, 0x1747422f, + 0x49547e0b, 0xbb3ffd08, 0xa86f0efc, 0x5a048dff, + 0x8ecee914, 0x7ca56a17, 0x6ff599e3, 0x9d9e1ae0, + 0xd3d3e1ab, 0x21b862a8, 0x32e8915c, 0xc083125f, + 0x144976b4, 0xe622f5b7, 0xf5720643, 0x07198540, + 0x590ab964, 0xab613a67, 0xb831c993, 0x4a5a4a90, + 0x9e902e7b, 0x6cfbad78, 0x7fab5e8c, 0x8dc0dd8f, + 0xe330a81a, 0x115b2b19, 0x020bd8ed, 0xf0605bee, + 0x24aa3f05, 0xd6c1bc06, 0xc5914ff2, 0x37faccf1, + 0x69e9f0d5, 0x9b8273d6, 0x88d28022, 0x7ab90321, + 0xae7367ca, 0x5c18e4c9, 0x4f48173d, 0xbd23943e, + 0xf36e6f75, 0x0105ec76, 0x12551f82, 0xe03e9c81, + 0x34f4f86a, 0xc69f7b69, 0xd5cf889d, 0x27a40b9e, + 0x79b737ba, 0x8bdcb4b9, 0x988c474d, 0x6ae7c44e, + 0xbe2da0a5, 0x4c4623a6, 0x5f16d052, 0xad7d5351, +) + + +def crc32c(crc, data): + if not isinstance(data, (bytes, bytearray)): + data = bytes(data, 'utf-8') + crc = crc & 0xffffffff + for char in data: + crc = table[(crc ^ char) & 0xff] ^ (crc >> 8) + return crc & 0xffffffff + + +def crc32c_data(data): + return 0xffffffff ^ crc32c(~0, data) + + +def name_hash(name): + return crc32c(~1, name) + + +def extref_hash(parent_objectid, name): + return crc32c(parent_objectid, name)