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#!/usr/bin/env python
from io import BytesIO, open
import struct
import hashlib
from dbparse import DBParser
import sys
from math import log
MAGIC = 0x52474442
VERSION = 20
if len(sys.argv) < 3:
print('Usage: %s output-file input-file' % sys.argv[0])
sys.exit(2)
def create_rules(countries):
result = {}
for c in countries.values():
for rule in c.permissions:
result[rule] = 1
return list(result)
def create_collections(countries):
result = {}
for c in countries.values():
result[(c.permissions, c.dfs_region)] = 1
return list(result)
def create_wmms(countries):
result = {}
for c in countries.values():
for rule in c.permissions:
if rule.wmmrule is not None:
result[rule.wmmrule] = 1
return list(result)
def be32(output, val):
output.write(struct.pack('>I', val))
def be16(output, val):
output.write(struct.pack('>H', val))
class PTR(object):
def __init__(self, output):
self._output = output
self._pos = output.tell()
be16(output, 0)
self._written = False
def set(self, val=None):
if val is None:
val = self._output.tell()
assert val & 3 == 0
self._offset = val
pos = self._output.tell()
self._output.seek(self._pos)
be16(self._output, val >> 2)
self._output.seek(pos)
self._written = True
def get(self):
return self._offset
@property
def written(self):
return self._written
p = DBParser()
countries = p.parse(open(sys.argv[2], 'r', encoding='utf-8'))
rules = create_rules(countries)
rules.sort()
collections = create_collections(countries)
collections.sort()
wmms = create_wmms(countries)
wmms.sort()
output = BytesIO()
# struct regdb_file_header
be32(output, MAGIC)
be32(output, VERSION)
country_ptrs = {}
countrynames = list(countries)
countrynames.sort()
for alpha2 in countrynames:
coll = countries[alpha2]
output.write(struct.pack('>2s', alpha2))
country_ptrs[alpha2] = PTR(output)
output.write(b'\x00' * 4)
wmmdb = {}
for w in wmms:
assert output.tell() & 3 == 0
wmmdb[w] = output.tell() >> 2
for r in w._as_tuple():
ecw = int(log(r[0] + 1, 2)) << 4 | int(log(r[1] + 1, 2))
ac = (ecw, r[2],r[3])
output.write(struct.pack('>BBH', *ac))
reg_rules = {}
flags = 0
for reg_rule in rules:
freq_range, power_rule, wmm_rule = reg_rule.freqband, reg_rule.power, reg_rule.wmmrule
reg_rules[reg_rule] = output.tell()
assert power_rule.max_ant_gain == 0
flags = 0
# convert to new rule flags
assert reg_rule.flags & ~0x899 == 0
if reg_rule.flags & 1<<0:
flags |= 1<<0
if reg_rule.flags & 1<<3:
flags |= 1<<1
if reg_rule.flags & 1<<4:
flags |= 1<<2
if reg_rule.flags & 1<<7:
flags |= 1<<3
if reg_rule.flags & 1<<11:
flags |= 1<<4
rule_len = 16
cac_timeout = 0 # TODO
if not (flags & 1<<2):
cac_timeout = 0
if cac_timeout or wmm_rule:
rule_len += 2
if wmm_rule is not None:
rule_len += 2
output.write(struct.pack('>BBHIII', rule_len, flags, int(power_rule.max_eirp * 100),
int(freq_range.start * 1000), int(freq_range.end * 1000), int(freq_range.maxbw * 1000),
))
if rule_len > 16:
output.write(struct.pack('>H', cac_timeout))
if rule_len > 18:
be16(output, wmmdb[wmm_rule])
while rule_len % 4:
output.write('\0')
rule_len += 1
for coll in collections:
for alpha2 in countrynames:
if (countries[alpha2].permissions, countries[alpha2].dfs_region) == coll:
assert not country_ptrs[alpha2].written
country_ptrs[alpha2].set()
slen = 3
output.write(struct.pack('>BBBx', slen, len(list(coll[0])), coll[1]))
coll = list(coll[0])
for regrule in coll:
be16(output, reg_rules[regrule] >> 2)
if len(coll) % 2:
be16(output, 0)
for alpha2 in countrynames:
assert country_ptrs[alpha2].written
outfile = open(sys.argv[1], 'wb')
outfile.write(output.getvalue())
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