268 lines
8.1 KiB
Python
268 lines
8.1 KiB
Python
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#!/usr/bin/env python
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import sys
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import os
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import struct
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from collections import namedtuple
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import io
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import argparse
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parser = argparse.ArgumentParser()
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parser.add_argument('rootdir', type=str, help='the path to rootfs')
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parser.add_argument('output', type=argparse.FileType('wb'), nargs='?', help='output file name')
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parser.add_argument('--dump', action='store_true', help='dump the fs hierarchy')
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parser.add_argument('--binary', action='store_true', help='output binary file')
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parser.add_argument('--addr', default='0', help='set the base address of the binary file, default to 0.')
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class File(object):
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def __init__(self, name):
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self._name = name
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self._data = open(name, 'rb').read()
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@property
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def name(self):
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return self._name
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@property
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def c_name(self):
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return '_' + self._name.replace('.', '_')
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@property
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def bin_name(self):
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# Pad to 4 bytes boundary with \0
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pad_len = 4
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bn = self._name + '\0' * (pad_len - len(self._name) % pad_len)
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return bn
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def c_data(self, prefix=''):
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'''Get the C code represent of the file content.'''
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head = 'static const rt_uint8_t %s[] = {\n' % \
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(prefix + self.c_name)
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tail = '\n};'
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if self.entry_size == 0:
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return ''
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if len(self._data) > 0 and type(self._data[0]) == int:
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return head + ','.join(('0x%02x' % i for i in self._data)) + tail
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else:
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return head + ','.join(('0x%02x' % ord(i) for i in self._data)) + tail
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@property
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def entry_size(self):
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return len(self._data)
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def bin_data(self, base_addr=0x0):
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return bytes(self._data)
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def dump(self, indent=0):
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print('%s%s' % (' ' * indent, self._name))
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class Folder(object):
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bin_fmt = struct.Struct('IIII')
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bin_item = namedtuple('dirent', 'type, name, data, size')
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def __init__(self, name):
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self._name = name
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self._children = []
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@property
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def name(self):
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return self._name
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@property
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def c_name(self):
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# add _ to avoid conflict with C key words.
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return '_' + self._name
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@property
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def bin_name(self):
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# Pad to 4 bytes boundary with \0
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pad_len = 4
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bn = self._name + '\0' * (pad_len - len(self._name) % pad_len)
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return bn
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def walk(self):
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# os.listdir will return unicode list if the argument is unicode.
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# TODO: take care of the unicode names
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for ent in os.listdir(u'.'):
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if os.path.isdir(ent):
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cwd = os.getcwd()
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d = Folder(ent)
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# depth-first
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os.chdir(os.path.join(cwd, ent))
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d.walk()
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# restore the cwd
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os.chdir(cwd)
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self._children.append(d)
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else:
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self._children.append(File(ent))
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def sort(self):
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def _sort(x, y):
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if x.name == y.name:
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return 0
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elif x.name > y.name:
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return 1
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else:
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return -1
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from functools import cmp_to_key
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self._children.sort(key=cmp_to_key(_sort))
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# sort recursively
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for c in self._children:
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if isinstance(c, Folder):
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c.sort()
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def dump(self, indent=0):
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print('%s%s' % (' ' * indent, self._name))
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for c in self._children:
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c.dump(indent + 1)
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def c_data(self, prefix=''):
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'''get the C code represent of the folder.
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It is recursive.'''
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# make the current dirent
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# static is good. Only root dirent is global visible.
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if self.entry_size == 0:
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return ''
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dhead = 'static const struct romfs_dirent %s[] = {\n' % (prefix + self.c_name)
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dtail = '\n};'
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body_fmt = ' {{{type}, "{name}", (rt_uint8_t *){data}, sizeof({data})/sizeof({data}[0])}}'
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body_fmt0= ' {{{type}, "{name}", RT_NULL, 0}}'
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# prefix of children
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cpf = prefix+self.c_name
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body_li = []
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payload_li = []
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for c in self._children:
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entry_size = c.entry_size
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if isinstance(c, File):
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tp = 'ROMFS_DIRENT_FILE'
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elif isinstance(c, Folder):
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tp = 'ROMFS_DIRENT_DIR'
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else:
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assert False, 'Unkown instance:%s' % str(c)
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if entry_size == 0:
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body_li.append(body_fmt0.format(type=tp, name = c.name))
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else:
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body_li.append(body_fmt.format(type=tp,
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name=c.name,
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data=cpf+c.c_name))
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payload_li.append(c.c_data(prefix=cpf))
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# All the data we need is defined in payload so we should append the
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# dirent to it. It also meet the depth-first policy in this code.
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payload_li.append(dhead + ',\n'.join(body_li) + dtail)
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return '\n\n'.join(payload_li)
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@property
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def entry_size(self):
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return len(self._children)
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def bin_data(self, base_addr=0x0):
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'''Return StringIO object'''
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# The binary layout is different from the C code layout. We put the
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# dirent before the payload in this mode. But the idea is still simple:
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# Depth-First.
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#{
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# rt_uint32_t type;
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# const char *name;
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# const rt_uint8_t *data;
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# rt_size_t size;
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#}
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d_li = []
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# payload base
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p_base = base_addr + self.bin_fmt.size * self.entry_size
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# the length to record how many data is in
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v_len = p_base
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# payload
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p_li = []
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for c in self._children:
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if isinstance(c, File):
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# ROMFS_DIRENT_FILE
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tp = 0
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elif isinstance(c, Folder):
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# ROMFS_DIRENT_DIR
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tp = 1
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else:
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assert False, 'Unkown instance:%s' % str(c)
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name = bytes(c.bin_name)
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name_addr = v_len
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v_len += len(name)
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data = c.bin_data(base_addr=v_len)
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data_addr = v_len
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# pad the data to 4 bytes boundary
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pad_len = 4
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if len(data) % pad_len != 0:
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data += '\0' * (pad_len - len(data) % pad_len)
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v_len += len(data)
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d_li.append(self.bin_fmt.pack(*self.bin_item(
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type=tp,
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name=name_addr,
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data=data_addr,
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size=c.entry_size)))
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p_li.extend((name, data))
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return bytes().join(d_li) + bytes().join(p_li)
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def get_c_data(tree):
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# Handle the root dirent specially.
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root_dirent_fmt = '''/* Generated by mkromfs. Edit with caution. */
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#include <rtthread.h>
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#include <dfs_romfs.h>
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{data}
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const struct romfs_dirent {name} = {{
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ROMFS_DIRENT_DIR, "/", (rt_uint8_t *){rootdirent}, sizeof({rootdirent})/sizeof({rootdirent}[0])
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}};
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'''
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return root_dirent_fmt.format(name='romfs_root',
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rootdirent=tree.c_name,
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data=tree.c_data())
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def get_bin_data(tree, base_addr):
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v_len = base_addr + Folder.bin_fmt.size
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name = bytes('/\0\0\0')
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name_addr = v_len
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v_len += len(name)
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data_addr = v_len
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# root entry
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data = Folder.bin_fmt.pack(*Folder.bin_item(type=1,
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name=name_addr,
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data=data_addr,
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size=tree.entry_size))
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return data + name + tree.bin_data(v_len)
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if __name__ == '__main__':
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args = parser.parse_args()
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os.chdir(args.rootdir)
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tree = Folder('romfs_root')
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tree.walk()
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tree.sort()
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if args.dump:
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tree.dump()
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if args.binary:
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data = get_bin_data(tree, int(args.addr, 16))
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else:
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data = get_c_data(tree).encode()
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output = args.output
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if not output:
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output = sys.stdout
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output.write(data)
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