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#
# Copyright 2009 Free Software Foundation, Inc.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# 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, see <http://www.gnu.org/licenses/>.
#
_SBF_MAGIC = 'SBF!'
_SBF_DONT_EXECUTE = 0x1
_SBF_MAX_SECTIONS = 14
_SBF_HEADER_LEN = 128
import struct
import sys
from pprint import pprint
def dump_data(f, offset, data):
L = len(data) // 4
for i in range(L):
f.write('%08x: %08x\n' % (offset + 4 * i, struct.unpack('>I', data[4*i:4*(i+1)])[0]))
remainder = len(data) - L * 4
if remainder != 0:
f.write('%08x: ' % (offset + L*4,))
i = 0
while i < remainder:
f.write('%02x' % ((ord(data[L*4 + i]),)))
i += 1
f.write('\n')
class sec_desc(object):
def __init__(self, target_addr, data):
self.target_addr = target_addr
self.data = data
def __repr__(self):
#print >>sys.stderr, "target_addr:", self.target_addr
#print >>sys.stderr, "data:", self.data
return "<sec_desc target_addr=0x%x len=%d>" % (
self.target_addr, len(self.data))
class header(object):
def __init__(self, entry, sections):
self.entry = entry
self.section = sections
def dump(self, f):
if self.entry == _SBF_DONT_EXECUTE:
f.write("Entry: DONT_EXECUTE\n")
else:
f.write("Entry: 0x%x\n" % (self.entry,))
for i in range(len(self.section)):
s = self.section[i]
f.write("Section[%d]: target_addr = 0x%x length = %d\n" % (i,
s.target_addr,
len(s.data)))
dump_data(f, s.target_addr, s.data)
#
# Returns an iterator. Each yield returns (target_addr, data)
#
def iterator(self, max_piece=512):
for s in self.section:
offset = 0
L = len(s.data)
while offset < L:
n = min(max_piece, L - offset)
yield (s.target_addr + offset,
s.data[offset:offset+n])
offset += n
def read_sbf(input_file):
"""Parse an SBF file"""
f = input_file.read(_SBF_HEADER_LEN)
#if len(f) < _SBF_HEADER_LEN or not f.startswith(_SBF_MAGIC):
#raise ValueError, '%s: not an SBF file' % (input_file.name,)
def extract(i):
start = 16+8*i
stop = start+8
return struct.unpack('>2I', f[start:stop])
def get_data(ss):
L = ss[1]
s = input_file.read(L)
#if len(s) != L:
#raise ValueError, '%s: file is too short' % (input_file.name(),)
return s
(magic, entry, nsections, reserved) = struct.unpack('>4s3I', f[0:16])
assert nsections <= _SBF_MAX_SECTIONS
descs = [extract(i) for i in range(nsections)]
#pprint(descs, sys.stderr)
data = map(get_data, descs)
secs = map(lambda ss, data: sec_desc(ss[0], data), descs, data)
return header(entry, secs)
def write_sbf(output_file, sbf_header):
assert(len(sbf_header.section) <= _SBF_MAX_SECTIONS)
sbf_header.nsections = len(sbf_header.section)
f = output_file
# write the file header
f.write(struct.pack('>4s3I', _SBF_MAGIC, sbf_header.entry, sbf_header.nsections, 0))
# write the section headers
for i in range(sbf_header.nsections):
f.write(struct.pack('>2I',
sbf_header.section[i].target_addr,
len(sbf_header.section[i].data)))
for i in range(_SBF_MAX_SECTIONS - sbf_header.nsections):
f.write(struct.pack('>2I', 0, 0))
# write the section data
for i in range(sbf_header.nsections):
f.write(sbf_header.section[i].data)
return True
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