528 lines
19 KiB
Python
528 lines
19 KiB
Python
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#!/usr/bin/env python
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#
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# spiffsgen is a tool used to generate a spiffs image from a directory
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#
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# Copyright 2019 Espressif Systems (Shanghai) PTE LTD
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http:#www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from __future__ import division
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import os
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import io
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import math
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import struct
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import argparse
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import ctypes
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SPIFFS_PH_FLAG_USED_FINAL_INDEX = 0xF8
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SPIFFS_PH_FLAG_USED_FINAL = 0xFC
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SPIFFS_PH_FLAG_LEN = 1
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SPIFFS_PH_IX_SIZE_LEN = 4
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SPIFFS_PH_IX_OBJ_TYPE_LEN = 1
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SPIFFS_TYPE_FILE = 1
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# Based on typedefs under spiffs_config.h
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SPIFFS_OBJ_ID_LEN = 2 # spiffs_obj_id
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SPIFFS_SPAN_IX_LEN = 2 # spiffs_span_ix
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SPIFFS_PAGE_IX_LEN = 2 # spiffs_page_ix
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SPIFFS_BLOCK_IX_LEN = 2 # spiffs_block_ix
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class SpiffsBuildConfig():
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def __init__(self, page_size, page_ix_len, block_size,
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block_ix_len, meta_len, obj_name_len, obj_id_len,
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span_ix_len, packed, aligned, endianness, use_magic, use_magic_len):
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if block_size % page_size != 0:
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raise RuntimeError("block size should be a multiple of page size")
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self.page_size = page_size
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self.block_size = block_size
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self.obj_id_len = obj_id_len
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self.span_ix_len = span_ix_len
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self.packed = packed
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self.aligned = aligned
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self.obj_name_len = obj_name_len
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self.meta_len = meta_len
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self.page_ix_len = page_ix_len
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self.block_ix_len = block_ix_len
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self.endianness = endianness
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self.use_magic = use_magic
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self.use_magic_len = use_magic_len
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self.PAGES_PER_BLOCK = self.block_size // self.page_size
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self.OBJ_LU_PAGES_PER_BLOCK = int(math.ceil(self.block_size / self.page_size * self.obj_id_len / self.page_size))
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self.OBJ_USABLE_PAGES_PER_BLOCK = self.PAGES_PER_BLOCK - self.OBJ_LU_PAGES_PER_BLOCK
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self.OBJ_LU_PAGES_OBJ_IDS_LIM = self.page_size // self.obj_id_len
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self.OBJ_DATA_PAGE_HEADER_LEN = self.obj_id_len + self.span_ix_len + SPIFFS_PH_FLAG_LEN
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pad = 4 - (4 if self.OBJ_DATA_PAGE_HEADER_LEN % 4 == 0 else self.OBJ_DATA_PAGE_HEADER_LEN % 4)
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self.OBJ_DATA_PAGE_HEADER_LEN_ALIGNED = self.OBJ_DATA_PAGE_HEADER_LEN + pad
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self.OBJ_DATA_PAGE_HEADER_LEN_ALIGNED_PAD = pad
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self.OBJ_DATA_PAGE_CONTENT_LEN = self.page_size - self.OBJ_DATA_PAGE_HEADER_LEN
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self.OBJ_INDEX_PAGES_HEADER_LEN = (self.OBJ_DATA_PAGE_HEADER_LEN_ALIGNED + SPIFFS_PH_IX_SIZE_LEN +
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SPIFFS_PH_IX_OBJ_TYPE_LEN + self.obj_name_len + self.meta_len)
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self.OBJ_INDEX_PAGES_OBJ_IDS_HEAD_LIM = (self.page_size - self.OBJ_INDEX_PAGES_HEADER_LEN) // self.block_ix_len
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self.OBJ_INDEX_PAGES_OBJ_IDS_LIM = (self.page_size - self.OBJ_DATA_PAGE_HEADER_LEN_ALIGNED) / self.block_ix_len
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class SpiffsFullError(RuntimeError):
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def __init__(self, message=None):
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super(SpiffsFullError, self).__init__(message)
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class SpiffsPage():
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_endianness_dict = {
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"little": "<",
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"big": ">"
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}
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_len_dict = {
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1: "B",
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2: "H",
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4: "I",
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8: "Q"
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}
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_type_dict = {
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1: ctypes.c_ubyte,
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2: ctypes.c_ushort,
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4: ctypes.c_uint,
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8: ctypes.c_ulonglong
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}
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def __init__(self, bix, build_config):
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self.build_config = build_config
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self.bix = bix
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class SpiffsObjLuPage(SpiffsPage):
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def __init__(self, bix, build_config):
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SpiffsPage.__init__(self, bix, build_config)
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self.obj_ids_limit = self.build_config.OBJ_LU_PAGES_OBJ_IDS_LIM
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self.obj_ids = list()
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def _calc_magic(self, blocks_lim):
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# Calculate the magic value mirrorring computation done by the macro SPIFFS_MAGIC defined in
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# spiffs_nucleus.h
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magic = 0x20140529 ^ self.build_config.page_size
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if self.build_config.use_magic_len:
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magic = magic ^ (blocks_lim - self.bix)
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magic = SpiffsPage._type_dict[self.build_config.obj_id_len](magic)
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return magic.value
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def register_page(self, page):
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if not self.obj_ids_limit > 0:
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raise SpiffsFullError()
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obj_id = (page.obj_id, page.__class__)
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self.obj_ids.append(obj_id)
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self.obj_ids_limit -= 1
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def to_binary(self):
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global test
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img = b""
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for (obj_id, page_type) in self.obj_ids:
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if page_type == SpiffsObjIndexPage:
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obj_id ^= (1 << ((self.build_config.obj_id_len * 8) - 1))
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img += struct.pack(SpiffsPage._endianness_dict[self.build_config.endianness] +
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SpiffsPage._len_dict[self.build_config.obj_id_len], obj_id)
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assert(len(img) <= self.build_config.page_size)
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img += b"\xFF" * (self.build_config.page_size - len(img))
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return img
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def magicfy(self, blocks_lim):
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# Only use magic value if no valid obj id has been written to the spot, which is the
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# spot taken up by the last obj id on last lookup page. The parent is responsible
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# for determining which is the last lookup page and calling this function.
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remaining = self.obj_ids_limit
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empty_obj_id_dict = {
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1: 0xFF,
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2: 0xFFFF,
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4: 0xFFFFFFFF,
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8: 0xFFFFFFFFFFFFFFFF
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}
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if (remaining >= 2):
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for i in range(remaining):
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if i == remaining - 2:
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self.obj_ids.append((self._calc_magic(blocks_lim), SpiffsObjDataPage))
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break
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else:
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self.obj_ids.append((empty_obj_id_dict[self.build_config.obj_id_len], SpiffsObjDataPage))
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self.obj_ids_limit -= 1
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class SpiffsObjIndexPage(SpiffsPage):
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def __init__(self, obj_id, span_ix, size, name, build_config):
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SpiffsPage.__init__(self, 0, build_config)
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self.obj_id = obj_id
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self.span_ix = span_ix
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self.name = name
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self.size = size
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if self.span_ix == 0:
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self.pages_lim = self.build_config.OBJ_INDEX_PAGES_OBJ_IDS_HEAD_LIM
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else:
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self.pages_lim = self.build_config.OBJ_INDEX_PAGES_OBJ_IDS_LIM
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self.pages = list()
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def register_page(self, page):
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if not self.pages_lim > 0:
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raise SpiffsFullError
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self.pages.append(page.offset)
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self.pages_lim -= 1
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def to_binary(self):
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obj_id = self.obj_id ^ (1 << ((self.build_config.obj_id_len * 8) - 1))
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img = struct.pack(SpiffsPage._endianness_dict[self.build_config.endianness] +
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SpiffsPage._len_dict[self.build_config.obj_id_len] +
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SpiffsPage._len_dict[self.build_config.span_ix_len] +
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SpiffsPage._len_dict[SPIFFS_PH_FLAG_LEN],
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obj_id,
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self.span_ix,
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SPIFFS_PH_FLAG_USED_FINAL_INDEX)
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# Add padding before the object index page specific information
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img += b"\xFF" * self.build_config.OBJ_DATA_PAGE_HEADER_LEN_ALIGNED_PAD
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# If this is the first object index page for the object, add filname, type
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# and size information
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if self.span_ix == 0:
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img += struct.pack(SpiffsPage._endianness_dict[self.build_config.endianness] +
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SpiffsPage._len_dict[SPIFFS_PH_IX_SIZE_LEN] +
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SpiffsPage._len_dict[SPIFFS_PH_FLAG_LEN],
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self.size,
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SPIFFS_TYPE_FILE)
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img += self.name.encode() + (b"\x00" * ((self.build_config.obj_name_len - len(self.name)) + self.build_config.meta_len))
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# Finally, add the page index of daa pages
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for page in self.pages:
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page = page >> int(math.log(self.build_config.page_size, 2))
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img += struct.pack(SpiffsPage._endianness_dict[self.build_config.endianness] +
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SpiffsPage._len_dict[self.build_config.page_ix_len], page)
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assert(len(img) <= self.build_config.page_size)
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img += b"\xFF" * (self.build_config.page_size - len(img))
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return img
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class SpiffsObjDataPage(SpiffsPage):
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def __init__(self, offset, obj_id, span_ix, contents, build_config):
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SpiffsPage.__init__(self, 0, build_config)
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self.obj_id = obj_id
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self.span_ix = span_ix
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self.contents = contents
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self.offset = offset
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def to_binary(self):
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img = struct.pack(SpiffsPage._endianness_dict[self.build_config.endianness] +
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SpiffsPage._len_dict[self.build_config.obj_id_len] +
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SpiffsPage._len_dict[self.build_config.span_ix_len] +
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SpiffsPage._len_dict[SPIFFS_PH_FLAG_LEN],
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self.obj_id,
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self.span_ix,
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SPIFFS_PH_FLAG_USED_FINAL)
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img += self.contents
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assert(len(img) <= self.build_config.page_size)
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img += b"\xFF" * (self.build_config.page_size - len(img))
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return img
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class SpiffsBlock():
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def _reset(self):
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self.cur_obj_index_span_ix = 0
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self.cur_obj_data_span_ix = 0
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self.cur_obj_id = 0
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self.cur_obj_idx_page = None
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def __init__(self, bix, blocks_lim, build_config):
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self.build_config = build_config
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self.offset = bix * self.build_config.block_size
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self.remaining_pages = self.build_config.OBJ_USABLE_PAGES_PER_BLOCK
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self.pages = list()
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self.bix = bix
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lu_pages = list()
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for i in range(self.build_config.OBJ_LU_PAGES_PER_BLOCK):
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page = SpiffsObjLuPage(self.bix, self.build_config)
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lu_pages.append(page)
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self.pages.extend(lu_pages)
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self.lu_page_iter = iter(lu_pages)
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self.lu_page = next(self.lu_page_iter)
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self._reset()
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def _register_page(self, page):
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if isinstance(page, SpiffsObjDataPage):
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self.cur_obj_idx_page.register_page(page) # can raise SpiffsFullError
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try:
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self.lu_page.register_page(page)
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except SpiffsFullError:
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self.lu_page = next(self.lu_page_iter)
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try:
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self.lu_page.register_page(page)
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except AttributeError: # no next lookup page
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# Since the amount of lookup pages is pre-computed at every block instance,
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# this should never occur
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raise RuntimeError("invalid attempt to add page to a block when there is no more space in lookup")
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self.pages.append(page)
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def begin_obj(self, obj_id, size, name, obj_index_span_ix=0, obj_data_span_ix=0):
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if not self.remaining_pages > 0:
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raise SpiffsFullError()
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self._reset()
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self.cur_obj_id = obj_id
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self.cur_obj_index_span_ix = obj_index_span_ix
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self.cur_obj_data_span_ix = obj_data_span_ix
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page = SpiffsObjIndexPage(obj_id, self.cur_obj_index_span_ix, size, name, self.build_config)
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self._register_page(page)
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self.cur_obj_idx_page = page
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self.remaining_pages -= 1
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self.cur_obj_index_span_ix += 1
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def update_obj(self, contents):
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if not self.remaining_pages > 0:
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raise SpiffsFullError()
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page = SpiffsObjDataPage(self.offset + (len(self.pages) * self.build_config.page_size),
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self.cur_obj_id, self.cur_obj_data_span_ix, contents, self.build_config)
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self._register_page(page)
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self.cur_obj_data_span_ix += 1
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self.remaining_pages -= 1
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def end_obj(self):
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self._reset()
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def is_full(self):
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return self.remaining_pages <= 0
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def to_binary(self, blocks_lim):
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img = b""
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if self.build_config.use_magic:
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for (idx, page) in enumerate(self.pages):
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if idx == self.build_config.OBJ_LU_PAGES_PER_BLOCK - 1:
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page.magicfy(blocks_lim)
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img += page.to_binary()
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else:
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for page in self.pages:
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img += page.to_binary()
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||
|
|
|
||
|
|
assert(len(img) <= self.build_config.block_size)
|
||
|
|
|
||
|
|
img += b"\xFF" * (self.build_config.block_size - len(img))
|
||
|
|
return img
|
||
|
|
|
||
|
|
|
||
|
|
class SpiffsFS():
|
||
|
|
def __init__(self, img_size, build_config):
|
||
|
|
if img_size % build_config.block_size != 0:
|
||
|
|
raise RuntimeError("image size should be a multiple of block size")
|
||
|
|
|
||
|
|
self.img_size = img_size
|
||
|
|
self.build_config = build_config
|
||
|
|
|
||
|
|
self.blocks = list()
|
||
|
|
self.blocks_lim = self.img_size // self.build_config.block_size
|
||
|
|
self.remaining_blocks = self.blocks_lim
|
||
|
|
self.cur_obj_id = 1 # starting object id
|
||
|
|
|
||
|
|
def _create_block(self):
|
||
|
|
if self.is_full():
|
||
|
|
raise SpiffsFullError("the image size has been exceeded")
|
||
|
|
|
||
|
|
block = SpiffsBlock(len(self.blocks), self.blocks_lim, self.build_config)
|
||
|
|
self.blocks.append(block)
|
||
|
|
self.remaining_blocks -= 1
|
||
|
|
return block
|
||
|
|
|
||
|
|
def is_full(self):
|
||
|
|
return self.remaining_blocks <= 0
|
||
|
|
|
||
|
|
def create_file(self, img_path, file_path):
|
||
|
|
contents = None
|
||
|
|
|
||
|
|
if len(img_path) > self.build_config.obj_name_len:
|
||
|
|
raise RuntimeError("object name '%s' too long" % img_path)
|
||
|
|
|
||
|
|
name = img_path
|
||
|
|
|
||
|
|
with open(file_path, "rb") as obj:
|
||
|
|
contents = obj.read()
|
||
|
|
|
||
|
|
stream = io.BytesIO(contents)
|
||
|
|
|
||
|
|
try:
|
||
|
|
block = self.blocks[-1]
|
||
|
|
block.begin_obj(self.cur_obj_id, len(contents), name)
|
||
|
|
except (IndexError, SpiffsFullError):
|
||
|
|
block = self._create_block()
|
||
|
|
block.begin_obj(self.cur_obj_id, len(contents), name)
|
||
|
|
|
||
|
|
contents_chunk = stream.read(self.build_config.OBJ_DATA_PAGE_CONTENT_LEN)
|
||
|
|
|
||
|
|
while contents_chunk:
|
||
|
|
try:
|
||
|
|
block = self.blocks[-1]
|
||
|
|
try:
|
||
|
|
# This can fail because either (1) all the pages in block have been
|
||
|
|
# used or (2) object index has been exhausted.
|
||
|
|
block.update_obj(contents_chunk)
|
||
|
|
except SpiffsFullError:
|
||
|
|
# If its (1), use the outer exception handler
|
||
|
|
if block.is_full():
|
||
|
|
raise SpiffsFullError
|
||
|
|
# If its (2), write another object index page
|
||
|
|
block.begin_obj(self.cur_obj_id, len(contents), name,
|
||
|
|
obj_index_span_ix=block.cur_obj_index_span_ix,
|
||
|
|
obj_data_span_ix=block.cur_obj_data_span_ix)
|
||
|
|
continue
|
||
|
|
except (IndexError, SpiffsFullError):
|
||
|
|
# All pages in the block have been exhausted. Create a new block, copying
|
||
|
|
# the previous state of the block to a new one for the continuation of the
|
||
|
|
# current object
|
||
|
|
prev_block = block
|
||
|
|
block = self._create_block()
|
||
|
|
block.cur_obj_id = prev_block.cur_obj_id
|
||
|
|
block.cur_obj_idx_page = prev_block.cur_obj_idx_page
|
||
|
|
block.cur_obj_data_span_ix = prev_block.cur_obj_data_span_ix
|
||
|
|
block.cur_obj_index_span_ix = prev_block.cur_obj_index_span_ix
|
||
|
|
continue
|
||
|
|
|
||
|
|
contents_chunk = stream.read(self.build_config.OBJ_DATA_PAGE_CONTENT_LEN)
|
||
|
|
|
||
|
|
block.end_obj()
|
||
|
|
|
||
|
|
self.cur_obj_id += 1
|
||
|
|
|
||
|
|
def to_binary(self):
|
||
|
|
img = b""
|
||
|
|
for block in self.blocks:
|
||
|
|
img += block.to_binary(self.blocks_lim)
|
||
|
|
bix = len(self.blocks)
|
||
|
|
if self.build_config.use_magic:
|
||
|
|
# Create empty blocks with magic numbers
|
||
|
|
while self.remaining_blocks > 0:
|
||
|
|
block = SpiffsBlock(bix, self.blocks_lim, self.build_config)
|
||
|
|
img += block.to_binary(self.blocks_lim)
|
||
|
|
self.remaining_blocks -= 1
|
||
|
|
bix += 1
|
||
|
|
else:
|
||
|
|
# Just fill remaining spaces FF's
|
||
|
|
img += "\xFF" * (self.img_size - len(img))
|
||
|
|
return img
|
||
|
|
|
||
|
|
|
||
|
|
def main():
|
||
|
|
parser = argparse.ArgumentParser(description="SPIFFS Image Generator",
|
||
|
|
formatter_class=argparse.ArgumentDefaultsHelpFormatter)
|
||
|
|
|
||
|
|
parser.add_argument("image_size",
|
||
|
|
help="Size of the created image")
|
||
|
|
|
||
|
|
parser.add_argument("base_dir",
|
||
|
|
help="Path to directory from which the image will be created")
|
||
|
|
|
||
|
|
parser.add_argument("output_file",
|
||
|
|
help="Created image output file path")
|
||
|
|
|
||
|
|
parser.add_argument("--page-size",
|
||
|
|
help="Logical page size. Set to value same as CONFIG_SPIFFS_PAGE_SIZE.",
|
||
|
|
type=int,
|
||
|
|
default=256)
|
||
|
|
|
||
|
|
parser.add_argument("--block-size",
|
||
|
|
help="Logical block size. Set to the same value as the flash chip's sector size (g_rom_flashchip.sector_size).",
|
||
|
|
type=int,
|
||
|
|
default=4096)
|
||
|
|
|
||
|
|
parser.add_argument("--obj-name-len",
|
||
|
|
help="File full path maximum length. Set to value same as CONFIG_SPIFFS_OBJ_NAME_LEN.",
|
||
|
|
type=int,
|
||
|
|
default=32)
|
||
|
|
|
||
|
|
parser.add_argument("--meta-len",
|
||
|
|
help="File metadata length. Set to value same as CONFIG_SPIFFS_META_LENGTH.",
|
||
|
|
type=int,
|
||
|
|
default=4)
|
||
|
|
|
||
|
|
parser.add_argument("--use-magic",
|
||
|
|
help="Use magic number to create an identifiable SPIFFS image. Specify if CONFIG_SPIFFS_USE_MAGIC.",
|
||
|
|
action="store_true",
|
||
|
|
default=True)
|
||
|
|
|
||
|
|
parser.add_argument("--use-magic-len",
|
||
|
|
help="Use position in memory to create different magic numbers for each block. Specify if CONFIG_SPIFFS_USE_MAGIC_LENGTH.",
|
||
|
|
action="store_true",
|
||
|
|
default=True)
|
||
|
|
|
||
|
|
parser.add_argument("--big-endian",
|
||
|
|
help="Specify if the target architecture is big-endian. If not specified, little-endian is assumed.",
|
||
|
|
action="store_true",
|
||
|
|
default=False)
|
||
|
|
|
||
|
|
args = parser.parse_args()
|
||
|
|
|
||
|
|
if not os.path.exists(args.base_dir):
|
||
|
|
raise RuntimeError("given base directory %s does not exist" % args.base_dir)
|
||
|
|
|
||
|
|
with open(args.output_file, "wb") as image_file:
|
||
|
|
image_size = int(args.image_size, 0)
|
||
|
|
spiffs_build_default = SpiffsBuildConfig(args.page_size, SPIFFS_PAGE_IX_LEN,
|
||
|
|
args.block_size, SPIFFS_BLOCK_IX_LEN, args.meta_len,
|
||
|
|
args.obj_name_len, SPIFFS_OBJ_ID_LEN, SPIFFS_SPAN_IX_LEN,
|
||
|
|
True, True, "big" if args.big_endian else "little",
|
||
|
|
args.use_magic, args.use_magic_len)
|
||
|
|
|
||
|
|
spiffs = SpiffsFS(image_size, spiffs_build_default)
|
||
|
|
|
||
|
|
for root, dirs, files in os.walk(args.base_dir):
|
||
|
|
for f in files:
|
||
|
|
full_path = os.path.join(root, f)
|
||
|
|
spiffs.create_file("/" + os.path.relpath(full_path, args.base_dir), full_path)
|
||
|
|
|
||
|
|
image = spiffs.to_binary()
|
||
|
|
|
||
|
|
image_file.write(image)
|
||
|
|
|
||
|
|
|
||
|
|
if __name__ == "__main__":
|
||
|
|
main()
|