308 lines
11 KiB
Python
Executable file
308 lines
11 KiB
Python
Executable file
#!/usr/bin/env python
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#
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# ESP32 partition table generation tool
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#
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# Converts partition tables to/from CSV and binary formats.
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#
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# See the sdkng README.md file for details about how to use this tool.
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import struct
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import argparse
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import sys
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__version__ = '1.0'
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quiet = False
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def status(msg):
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""" Print status message to stderr """
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if not quiet:
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critical(msg)
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def critical(msg):
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""" Print critical message to stderr """
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if not quiet:
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sys.stderr.write(msg)
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sys.stderr.write('\n')
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class PartitionTable(list):
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def __init__(self):
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super(PartitionTable, self).__init__(self)
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@classmethod
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def from_csv(cls, csv_contents):
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res = PartitionTable()
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lines = csv_contents.split("\n")
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for line_no in range(len(lines)):
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line = lines[line_no].strip()
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if line.startswith("#") or len(line) == 0:
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continue
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try:
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res.append(PartitionDefinition.from_csv(line))
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except InputError as e:
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raise InputError("Error at line %d: %s" % (line_no+1, e))
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except Exception:
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critical("Unexpected error parsing line %d: %s" % (line_no+1, line))
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raise
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# fix up missing offsets & negative sizes
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last_end = 0x5000 # first offset after partition table
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for e in res:
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if e.offset is None:
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pad_to = 0x10000 if e.type == PartitionDefinition.APP_TYPE else 4
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if last_end % pad_to != 0:
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last_end += pad_to - (last_end % pad_to)
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e.offset = last_end
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if e.size < 0:
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e.size = -e.size - e.offset
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last_end = e.offset + e.size
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return res
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def __getitem__(self, item):
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""" Allow partition table access via name as well as by
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numeric index. """
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if isinstance(item, str):
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for x in self:
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if x.name == item:
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return x
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raise ValueError("No partition entry named '%s'" % item)
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else:
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return super(PartitionTable, self).__getitem__(item)
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def verify(self):
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# verify each partition individually
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for p in self:
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p.verify()
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# check for overlaps
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last = None
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for p in sorted(self):
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if p.offset < 0x5000:
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raise InputError("Partition offset 0x%x is below 0x5000" % p.offset)
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if last is not None and p.offset < last.offset + last.size:
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raise InputError("Partition at 0x%x overlaps 0x%x-0x%x" % (p.offset, last.offset, last.offset+last.size-1))
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last = p
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@classmethod
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def from_binary(cls, b):
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if len(b) % 32 != 0:
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raise InputError("Partition table length must be a multiple of 32 bytes. Got %d bytes." % len(b))
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result = cls()
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for o in range(0,len(b),32):
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result.append(PartitionDefinition.from_binary(b[o:o+32]))
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return result
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def to_binary(self):
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return "".join(e.to_binary() for e in self)
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def to_csv(self, simple_formatting=False):
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rows = [ "# Espressif ESP32 Partition Table",
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"# Name, Type, SubType, Offset, Size" ]
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rows += [ x.to_csv(simple_formatting) for x in self ]
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return "\n".join(rows) + "\n"
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class PartitionDefinition(object):
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APP_TYPE = 0x00
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DATA_TYPE = 0x01
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TYPES = {
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"app" : APP_TYPE,
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"data" : DATA_TYPE,
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}
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SUBTYPES = {
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APP_TYPE : {
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"factory" : 0x00,
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"test" : 0x20,
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},
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DATA_TYPE : {
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"ota" : 0x00,
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"rf" : 0x01,
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"wifi" : 0x02,
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},
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}
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MAGIC_BYTES = "\xAA\x50"
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ALIGNMENT = {
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APP_TYPE : 0x1000,
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DATA_TYPE : 0x04,
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}
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# add subtypes for the 16 OTA slot values ("ota_XXX, etc.")
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for ota_slot in range(16):
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SUBTYPES[TYPES["app"]]["ota_%d" % ota_slot] = 0x10 + ota_slot
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def __init__(self):
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self.name = ""
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self.type = None
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self.subtype = None
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self.offset = None
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self.size = None
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@classmethod
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def from_csv(cls, line):
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""" Parse a line from the CSV """
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line_w_defaults = line + ",,," # lazy way to support default fields
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fields = [ f.strip() for f in line_w_defaults.split(",") ]
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res = PartitionDefinition()
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res.name = fields[0]
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res.type = res.parse_type(fields[1])
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res.subtype = res.parse_subtype(fields[2])
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res.offset = res.parse_address(fields[3])
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res.size = res.parse_address(fields[4])
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if res.size is None:
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raise InputError("Size field can't be empty")
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return res
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def __eq__(self, other):
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return self.name == other.name and self.type == other.type \
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and self.subtype == other.subtype and self.offset == other.offset \
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and self.size == other.size
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def __repr__(self):
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def maybe_hex(x):
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return "0x%x" % x if x is not None else "None"
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return "PartitionDefinition('%s', 0x%x, 0x%x, %s, %s)" % (self.name, self.type, self.subtype or 0,
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maybe_hex(self.offset), maybe_hex(self.size))
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def __str__(self):
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return "Part '%s' %d/%d @ 0x%x size 0x%x" % (self.name, self.type, self.subtype, self.offset or -1, self.size or -1)
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def __cmp__(self, other):
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return self.offset - other.offset
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def parse_type(self, strval):
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if strval == "":
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raise InputError("Field 'type' can't be left empty.")
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return parse_int(strval, self.TYPES)
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def parse_subtype(self, strval):
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if strval == "":
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return 0 # default
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return parse_int(strval, self.SUBTYPES.get(self.type, {}))
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def parse_address(self, strval):
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if strval == "":
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return None # PartitionTable will fill in default
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return parse_int(strval)
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def verify(self):
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if self.type is None:
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raise ValidationError("Type field is not set")
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if self.subtype is None:
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raise ValidationError("Subtype field is not set")
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if self.offset is None:
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raise ValidationError("Offset field is not set")
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align = self.ALIGNMENT.get(self.type, 4)
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if self.offset % align:
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raise ValidationError("%s offset 0x%x is not aligned to 0x%x" % (self.name, self.offset, align))
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if self.size is None:
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raise ValidationError("Size field is not set")
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STRUCT_FORMAT = "<2sBBLL16sL"
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@classmethod
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def from_binary(cls, b):
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if len(b) != 32:
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raise InputError("Partition definition length must be exactly 32 bytes. Got %d bytes." % len(b))
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res = cls()
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(magic, res.type, res.subtype, res.offset,
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res.size, res.name, reserved) = struct.unpack(cls.STRUCT_FORMAT, b)
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if "\x00" in res.name: # strip null byte padding from name string
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res.name = res.name[:res.name.index("\x00")]
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if magic != cls.MAGIC_BYTES:
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raise InputError("Invalid magic bytes (%r) for partition definition" % magic)
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if reserved != 0:
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critical("WARNING: Partition definition had unexpected reserved value 0x%08x. Newer binary format?" % reserved)
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return res
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def to_binary(self):
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return struct.pack(self.STRUCT_FORMAT,
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self.MAGIC_BYTES,
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self.type, self.subtype,
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self.offset, self.size,
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self.name,
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0) # reserved
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def to_csv(self, simple_formatting=False):
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def addr_format(a, include_sizes):
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if not simple_formatting and include_sizes:
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for (val, suffix) in [ (0x100000, "M"), (0x400, "K") ]:
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if a % val == 0:
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return "%d%s" % (a / val, suffix)
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return "0x%x" % a
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def lookup_keyword(t, keywords):
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for k,v in keywords.items():
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if simple_formatting == False and t == v:
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return k
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return "%d" % t
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return ",".join([ self.name,
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lookup_keyword(self.type, self.TYPES),
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lookup_keyword(self.subtype, self.SUBTYPES.get(self.type, {})),
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addr_format(self.offset, False),
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addr_format(self.size, True) ])
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class InputError(RuntimeError):
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def __init__(self, e):
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super(InputError, self).__init__(e)
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def parse_int(v, keywords={}):
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"""Generic parser for integer fields - int(x,0) with provision for
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k/m/K/M suffixes and 'keyword' value lookup.
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"""
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try:
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for letter, multiplier in [ ("k",1024), ("m",1024*1024) ]:
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if v.lower().endswith(letter):
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return parse_int(v[:-1], keywords) * multiplier
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return int(v, 0)
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except ValueError:
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if len(keywords) == 0:
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raise InputError("Invalid field value %s" % v)
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try:
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return keywords[v.lower()]
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except KeyError:
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raise InputError("Value '%s' is not valid. Known keywords: %s" % (v, ", ".join(keywords)))
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def main():
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global quiet
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parser = argparse.ArgumentParser(description='ESP32 partition table utility')
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parser.add_argument('--verify', '-v', help='Verify partition table fields', default=True, action='store_false')
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parser.add_argument('--quiet', '-q', help="Don't print status messages to stderr", action='store_true')
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parser.add_argument('input', help='Path to CSV or binary file to parse. Will use stdin if omitted.', type=argparse.FileType('r'), default=sys.stdin)
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parser.add_argument('output', help='Path to output converted binary or CSV file. Will use stdout if omitted, unless the --display argument is also passed (in which case only the summary is printed.)',
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nargs='?',
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default='-')
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args = parser.parse_args()
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quiet = args.quiet
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input = args.input.read()
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input_is_binary = input[0:2] == PartitionDefinition.MAGIC_BYTES
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if input_is_binary:
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status("Parsing binary partition input...")
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table = PartitionTable.from_binary(input)
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else:
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status("Parsing CSV input...")
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table = PartitionTable.from_csv(input)
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if args.verify:
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status("Verifying table...")
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table.verify()
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if input_is_binary:
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output = table.to_csv()
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else:
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output = table.to_binary()
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with sys.stdout if args.output == '-' else open(args.output, 'w') as f:
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f.write(output)
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if __name__ == '__main__':
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try:
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main()
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except InputError as e:
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print(e)
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sys.exit(2)
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