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119 lines
4.8 KiB
Python
119 lines
4.8 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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#############################################################
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# Adapted in part from linux-source-3.2/drivers/mtd/ubi/ubi-media.h
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# for use in Python.
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# Oct. 2013 by Jason Pruitt
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#
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# Original copyright notice.
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# --------------------------
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#
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# Copyright (c) International Business Machines Corp., 2006
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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# the GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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# Authors: Artem Bityutskiy (Битюцкий Артём)
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# Thomas Gleixner
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# Frank Haverkamp
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# Oliver Lohmann
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# Andreas Arnez
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#
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#############################################################
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import struct
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# Magic number
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UBI_EC_HDR_MAGIC = b'\x55\x42\x49\x23'
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# Initial CRC32 checksum value.
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UBI_CRC32_INIT = 4294967295 #0xFFFFFFFF
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# Max number of volumes allowed.
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UBI_MAX_VOLUMES = 128
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# Internal Volume ID start.
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UBI_INTERNAL_VOL_START = 2147479551
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# Error Count header.
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EC_HDR_FORMAT = '>4sB3sQIII32sI'
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EC_HDR_FIELDS = ['magic', # Magic string UBI#
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'version', # UBI version meant to accept this image.
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'padding', # Reserved for future, zeros.
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'ec', # Erase counter
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'vid_hdr_offset', # Where the VID header starts.
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'data_offset', # Where user data starts.
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'image_seq', # Image sequence number
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'padding2', # Reserved for future, zeros.
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'hdr_crc'] # EC header crc32 checksum.
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UBI_EC_HDR_SZ = struct.calcsize(EC_HDR_FORMAT) # 64
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# Volume ID header.
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UBI_VID_HDR_MAGIC =b'\x55\x42\x49\x21' # UBI!
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VID_HDR_FORMAT = '>4sBBBBII4sIIII4sQ12sI'
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VID_HDR_FIELDS = ['magic', # Magic string UBI!
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'version', # UBI version meant to accept this image.
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'vol_type', # Volume type, Dynamic/Static
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'copy_flag', # If this is a copied PEB b/c of wear leveling.
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'compat', # Compatibility of this volume UBI_COMPAT_*
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'vol_id', # ID of this volume.
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'lnum', # LEB number.
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'padding', # Reserved for future, zeros.
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'data_size', # How many bytes of data this contains.
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# Used for static types only.
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'used_ebs', # Total num of used LEBs in this volume.
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'data_pad', # How many bytes at end of LEB are not used.
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'data_crc', # CRC32 checksum of data, static type only.
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'padding2', # Reserved for future, zeros.
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'sqnum', # Sequence number.
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'padding3', # Reserved for future, zeros.
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'hdr_crc'] # VID header CRC32 checksum.
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UBI_VID_HDR_SZ = struct.calcsize(VID_HDR_FORMAT) # 64
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# Volume table records.
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VTBL_REC_FORMAT = '>IIIBBH128sB23sI'
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VTBL_REC_FIELDS = ['reserved_pebs', # How many PEBs reserved for this volume.
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'alignment', # Volume alignment.
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'data_pad', # Number of unused bytes at end of PEB.
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'vol_type', # Volume type, static/dynamic.
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'upd_marker', # If vol update started but not finished.
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'name_len', # Length of name.
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'name', # Volume name.
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'flags', # Volume flags
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'padding', # Reserved for future, zeros.
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'crc'] # Vol record CRC32 checksum.
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UBI_VTBL_REC_SZ = struct.calcsize(VTBL_REC_FORMAT) # 172
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# Volume Identifier Header
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UBI_VID_DYNAMIC = 1 # Volume can be resized.
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UBI_VID_STATIC = 2 # Volume can not be resized.
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PRINT_VOL_TYPE_LIST = [0, 'dynamic', 'static']
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# Volume table record
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UBI_VTBL_AUTORESIZE_FLG = 1
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UBI_COMPAT_DELETE = 1 # Delete this internal volume before anything written.
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UBI_COMPAT_RO = 2 # Attach this device in read-only mode.
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UBI_COMPAT_PRESERVE = 4 # Preserve this internal volume - touch nothing.
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UBI_COMPAT_REJECT = 5 # Reject this UBI image
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PRINT_COMPAT_LIST = [0, 'Delete', 'Read Only', 0, 'Preserve', 'Reject']
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# File chunk size for reads.
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FILE_CHUNK_SZ = 5 * 1024 * 1024 |