def _from_bytes(byte_list):
"""Takes a list of bytes, computes the checksum, and outputs the entire
record as a string. bytes should be the hex record without the colon
or final checksum.
@param byte_list list of byte values so far to pack into record.
@return String representation of one HEX record
"""
assert len(byte_list) >= 4
# calculate checksum
s = (-sum(byte_list)) & 0x0FF
bin = array('B', byte_list + [s])
return ':' + asstr(hexlify(array_tobytes(bin))).upper()
def gets(self, addr, length):
"""Get string of bytes from given address. If any entries are blank
from addr through addr+length, a NotEnoughDataError exception will
be raised. Padding is not used.
"""
a = array('B', asbytes('\0' * length))
try:
for i in range_g(length):
a[i] = self._buf[addr + i]
except KeyError:
raise NotEnoughDataError(address=addr, length=length)
return array_tobytes(a)
def gets(self, addr, length):
"""Get string of bytes from given address. If any entries are blank
from addr through addr+length, a NotEnoughDataError exception will
be raised. Padding is not used.
"""
a = array('B', asbytes('\0'*length))
try:
for i in range_g(length):
a[i] = self._buf[addr+i]
except KeyError:
raise NotEnoughDataError(address=addr, length=length)
return array_tobytes(a)
def _from_bytes(bytes):
"""Takes a list of bytes, computes the checksum, and outputs the entire
record as a string. bytes should be the hex record without the colon
or final checksum.
@param bytes list of byte values so far to pack into record.
@return String representation of one HEX record
"""
assert len(bytes) >= 4
# calculate checksum
s = (-sum(bytes)) & 0x0FF
bin = array('B', bytes + [s])
return ':' + asstr(hexlify(array_tobytes(bin))).upper()
def write_hex_file(self, f, write_start_addr=True):
"""Write data to file f in HEX format.
@param f filename or file-like object for writing
@param write_start_addr enable or disable writing start address
record to file (enabled by default).
If there is no start address in obj, nothing
will be written regardless of this setting.
"""
fwrite = getattr(f, "write", None)
if fwrite:
fobj = f
fclose = None
else:
fobj = open(f, 'w')
fwrite = fobj.write
fclose = fobj.close
# Translation table for uppercasing hex ascii string.
# timeit shows that using hexstr.translate(table)
# is faster than hexstr.upper():
# 0.452ms vs. 0.652ms (translate vs. upper)
if sys.version_info[0] >= 3:
# Python 3
table = bytes(range_l(256)).upper()
else:
# Python 2
table = ''.join(chr(i).upper() for i in range_g(256))
# start address record if any
if self.start_addr and write_start_addr:
keys = dict_keys(self.start_addr)
keys.sort()
bin = array('B', asbytes('\0'*9))
if keys == ['CS','IP']:
# Start Segment Address Record
bin[0] = 4 # reclen
bin[1] = 0 # offset msb
bin[2] = 0 # offset lsb
bin[3] = 3 # rectyp
cs = self.start_addr['CS']
bin[4] = (cs >> 8) & 0x0FF
bin[5] = cs & 0x0FF
ip = self.start_addr['IP']
bin[6] = (ip >> 8) & 0x0FF
bin[7] = ip & 0x0FF
bin[8] = (-sum(bin)) & 0x0FF # chksum
fwrite(':' +
asstr(hexlify(array_tobytes(bin)).translate(table)) +
'\n')
elif keys == ['EIP']:
# Start Linear Address Record
bin[0] = 4 # reclen
bin[1] = 0 # offset msb
bin[2] = 0 # offset lsb
bin[3] = 5 # rectyp
eip = self.start_addr['EIP']
bin[4] = (eip >> 24) & 0x0FF
bin[5] = (eip >> 16) & 0x0FF
bin[6] = (eip >> 8) & 0x0FF
bin[7] = eip & 0x0FF
bin[8] = (-sum(bin)) & 0x0FF # chksum
fwrite(':' +
asstr(hexlify(array_tobytes(bin)).translate(table)) +
'\n')
else:
if fclose:
fclose()
raise InvalidStartAddressValueError(start_addr=self.start_addr)
# data
addresses = dict_keys(self._buf)
addresses.sort()
addr_len = len(addresses)
if addr_len:
minaddr = addresses[0]
maxaddr = addresses[-1]
if maxaddr > 65535:
need_offset_record = True
else:
need_offset_record = False
high_ofs = 0
cur_addr = minaddr
cur_ix = 0
while cur_addr <= maxaddr:
if need_offset_record:
bin = array('B', asbytes('\0'*7))
bin[0] = 2 # reclen
bin[1] = 0 # offset msb
bin[2] = 0 # offset lsb
bin[3] = 4 # rectyp
high_ofs = int(cur_addr>>16)
b = divmod(high_ofs, 256)
bin[4] = b[0] # msb of high_ofs
bin[5] = b[1] # lsb of high_ofs
bin[6] = (-sum(bin)) & 0x0FF # chksum
fwrite(':' +
asstr(hexlify(array_tobytes(bin)).translate(table)) +
'\n')
while True:
# produce one record
low_addr = cur_addr & 0x0FFFF
# chain_len off by 1
chain_len = min(15, 65535-low_addr, maxaddr-cur_addr)
# search continuous chain
stop_addr = cur_addr + chain_len
if chain_len:
ix = bisect_right(addresses, stop_addr,
cur_ix,
min(cur_ix+chain_len+1, addr_len))
chain_len = ix - cur_ix # real chain_len
# there could be small holes in the chain
# but we will catch them by try-except later
# so for big continuous files we will work
# at maximum possible speed
else:
chain_len = 1 # real chain_len
bin = array('B', asbytes('\0'*(5+chain_len)))
b = divmod(low_addr, 256)
bin[1] = b[0] # msb of low_addr
bin[2] = b[1] # lsb of low_addr
bin[3] = 0 # rectype
try: # if there is small holes we'll catch them
for i in range_g(chain_len):
bin[4+i] = self._buf[cur_addr+i]
except KeyError:
# we catch a hole so we should shrink the chain
chain_len = i
bin = bin[:5+i]
bin[0] = chain_len
bin[4+chain_len] = (-sum(bin)) & 0x0FF # chksum
fwrite(':' +
asstr(hexlify(array_tobytes(bin)).translate(table)) +
'\n')
# adjust cur_addr/cur_ix
cur_ix += chain_len
if cur_ix < addr_len:
cur_addr = addresses[cur_ix]
else:
cur_addr = maxaddr + 1
break
high_addr = int(cur_addr>>16)
if high_addr > high_ofs:
break
# end-of-file record
fwrite(":00000001FF\n")
if fclose:
fclose()
def _tobinstr_really(self, start, end, pad, size):
return array_tobytes(self._tobinarray_really(start, end, pad, size))
def write_hex_file(self, f, write_start_addr=True):
"""Write data to file f in HEX format.
@param f filename or file-like object for writing
@param write_start_addr enable or disable writing start address
record to file (enabled by default).
If there is no start address in obj, nothing
will be written regardless of this setting.
"""
fwrite = getattr(f, "write", None)
if fwrite:
fobj = f
fclose = None
else:
fobj = open(f, 'w')
fwrite = fobj.write
fclose = fobj.close
# Translation table for uppercasing hex ascii string.
# timeit shows that using hexstr.translate(table)
# is faster than hexstr.upper():
# 0.452ms vs. 0.652ms (translate vs. upper)
if sys.version_info[0] >= 3:
# Python 3
table = bytes(range_l(256)).upper()
else:
# Python 2
table = ''.join(chr(i).upper() for i in range_g(256))
# start address record if any
if self.start_addr and write_start_addr:
keys = dict_keys(self.start_addr)
keys.sort()
bin = array('B', asbytes('\0' * 9))
if keys == ['CS', 'IP']:
# Start Segment Address Record
bin[0] = 4 # reclen
bin[1] = 0 # offset msb
bin[2] = 0 # offset lsb
bin[3] = 3 # rectyp
cs = self.start_addr['CS']
bin[4] = (cs >> 8) & 0x0FF
bin[5] = cs & 0x0FF
ip = self.start_addr['IP']
bin[6] = (ip >> 8) & 0x0FF
bin[7] = ip & 0x0FF
bin[8] = (-sum(bin)) & 0x0FF # chksum
fwrite(':' +
asstr(hexlify(array_tobytes(bin)).translate(table)) +
'\n')
elif keys == ['EIP']:
# Start Linear Address Record
bin[0] = 4 # reclen
bin[1] = 0 # offset msb
bin[2] = 0 # offset lsb
bin[3] = 5 # rectyp
eip = self.start_addr['EIP']
bin[4] = (eip >> 24) & 0x0FF
bin[5] = (eip >> 16) & 0x0FF
bin[6] = (eip >> 8) & 0x0FF
bin[7] = eip & 0x0FF
bin[8] = (-sum(bin)) & 0x0FF # chksum
fwrite(':' +
asstr(hexlify(array_tobytes(bin)).translate(table)) +
'\n')
else:
if fclose:
fclose()
raise InvalidStartAddressValueError(start_addr=self.start_addr)
# data
addresses = dict_keys(self._buf)
addresses.sort()
addr_len = len(addresses)
if addr_len:
minaddr = addresses[0]
maxaddr = addresses[-1]
if maxaddr > 65535:
need_offset_record = True
else:
need_offset_record = False
high_ofs = 0
cur_addr = minaddr
cur_ix = 0
while cur_addr <= maxaddr:
if need_offset_record:
bin = array('B', asbytes('\0' * 7))
bin[0] = 2 # reclen
bin[1] = 0 # offset msb
bin[2] = 0 # offset lsb
bin[3] = 4 # rectyp
high_ofs = int(cur_addr >> 16)
b = divmod(high_ofs, 256)
bin[4] = b[0] # msb of high_ofs
bin[5] = b[1] # lsb of high_ofs
bin[6] = (-sum(bin)) & 0x0FF # chksum
fwrite(
':' +
asstr(hexlify(array_tobytes(bin)).translate(table)) +
'\n')
while True:
# produce one record
low_addr = cur_addr & 0x0FFFF
# chain_len off by 1
chain_len = min(15, 65535 - low_addr, maxaddr - cur_addr)
# search continuous chain
stop_addr = cur_addr + chain_len
if chain_len:
ix = bisect_right(
addresses, stop_addr, cur_ix,
min(cur_ix + chain_len + 1, addr_len))
chain_len = ix - cur_ix # real chain_len
# there could be small holes in the chain
# but we will catch them by try-except later
# so for big continuous files we will work
# at maximum possible speed
else:
chain_len = 1 # real chain_len
bin = array('B', asbytes('\0' * (5 + chain_len)))
b = divmod(low_addr, 256)
bin[1] = b[0] # msb of low_addr
bin[2] = b[1] # lsb of low_addr
bin[3] = 0 # rectype
try: # if there is small holes we'll catch them
for i in range_g(chain_len):
bin[4 + i] = self._buf[cur_addr + i]
except KeyError:
# we catch a hole so we should shrink the chain
chain_len = i
bin = bin[:5 + i]
bin[0] = chain_len
bin[4 + chain_len] = (-sum(bin)) & 0x0FF # chksum
fwrite(
':' +
asstr(hexlify(array_tobytes(bin)).translate(table)) +
'\n')
# adjust cur_addr/cur_ix
cur_ix += chain_len
if cur_ix < addr_len:
cur_addr = addresses[cur_ix]
else:
cur_addr = maxaddr + 1
break
high_addr = int(cur_addr >> 16)
if high_addr > high_ofs:
break
# end-of-file record
fwrite(":00000001FF\n")
if fclose:
fclose()
def _tobinstr_really(self, start, end, pad, size):
return array_tobytes(self._tobinarray_really(start, end, pad, size))