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#!/usr/bin/python
##
## license:BSD-3-Clause
## copyright-holders:Vas Crabb
from . import dbaccess
import codecs
import hashlib
import os
import os.path
import struct
import sys
import zlib
class _Identifier(object):
def __init__(self, dbcurs, **kwargs):
super(_Identifier, self).__init__(**kwargs)
self.dbcurs = dbcurs
self.pathwidth = 0
self.labelwidth = 0
self.matches = { }
self.unmatched = [ ]
def processRomFile(self, path, f):
crc, sha1 = self.digestRom(f)
matched = False
for shortname, description, label, bad in self.dbcurs.get_rom_dumps(crc, sha1):
matched = True
self.labelwidth = max(len(label), self.labelwidth)
romset = self.matches.get(shortname)
if romset is None:
romset = (description, [])
self.matches[shortname] = romset
romset[1].append((path, label, bad))
if not matched:
self.unmatched.append((path, crc, sha1))
self.pathwidth = max(len(path), self.pathwidth)
def processChd(self, path, sha1):
matched = False
for shortname, description, label, bad in self.dbcurs.get_disk_dumps(sha1):
matched = True
self.labelwidth = max(len(label), self.labelwidth)
romset = self.matches.get(shortname)
if romset is None:
romset = (description, [])
self.matches[shortname] = romset
romset[1].append((path, label, bad))
if not matched:
self.unmatched.append((path, None, sha1))
self.pathwidth = max(len(path), self.pathwidth)
def processFile(self, path):
if os.path.splitext(path)[1].lower() != '.chd':
with open(path, mode='rb', buffering=0) as f:
self.processRomFile(path, f)
else:
with open(path, mode='rb') as f:
sha1 = self.probeChd(f)
if sha1 is None:
f.seek(0)
self.processRomFile(path, f)
else:
self.processChd(path, sha1)
def processPath(self, path, depth=0):
try:
if not os.path.isdir(path):
self.processFile(path)
elif depth > 5:
sys.stderr.write('Not examining \'%s\' - maximum depth exceeded\n')
else:
for name in os.listdir(path):
self.processPath(os.path.join(path, name), depth + 1)
except BaseException as e:
sys.stderr.write('Error identifying \'%s\': %s\n' % (path, e))
def printResults(self):
pw = self.pathwidth - (self.pathwidth % 4) + 4
lw = self.labelwidth - (self.labelwidth % 4) + 4
first = True
for shortname, romset in sorted(self.matches.items()):
if first:
first = False
else:
sys.stdout.write('\n')
sys.stdout.write('%-20s%s\n' % (shortname, romset[0]))
for path, label, bad in romset[1]:
if bad:
sys.stdout.write(' %-*s= %-*s(BAD)\n' % (pw, path, lw, label))
else:
sys.stdout.write(' %-*s= %s\n' % (pw, path, label))
if self.unmatched:
if first:
first = False
else:
sys.stdout.write('\n')
sys.stdout.write('Unmatched\n')
for path, crc, sha1 in self.unmatched:
if crc is not None:
sys.stdout.write(' %-*sCRC(%08x) SHA1(%s)\n' % (pw, path, crc, sha1))
else:
sys.stdout.write(' %-*sSHA1(%s)\n' % (pw, path, sha1))
@staticmethod
def iterateBlocks(f, s=65536):
while True:
buf = f.read(s)
if buf:
yield buf
else:
break
@staticmethod
def digestRom(f):
crc = zlib.crc32(bytes())
sha = hashlib.sha1()
for block in _Identifier.iterateBlocks(f):
crc = zlib.crc32(block, crc)
sha.update(block)
return crc & 0xffffffff, sha.hexdigest()
@staticmethod
def probeChd(f):
buf = f.read(16)
if (len(buf) != 16) or (buf[:8] != b'MComprHD'):
return None
headerlen, version = struct.unpack('>II', buf[8:])
if version == 3:
if headerlen != 120:
return None
sha1offs = 80
elif version == 4:
if headerlen != 108:
return None
sha1offs = 48
elif version == 5:
if headerlen != 124:
return None
sha1offs = 84
else:
return None
f.seek(sha1offs)
if f.tell() != sha1offs:
return None
buf = f.read(20)
if len(buf) != 20:
return None
return codecs.getencoder('hex_codec')(buf)[0].decode('ascii')
def do_listfull(options):
dbconn = dbaccess.QueryConnection(options.database)
dbcurs = dbconn.cursor()
first = True
for shortname, description in dbcurs.listfull(options.pattern):
if first:
sys.stdout.write('Name: Description:\n')
first = False
sys.stdout.write('%-16s "%s"\n' % (shortname, description))
if first:
sys.stderr.write('No matching systems found for \'%s\'\n' % (options.pattern, ))
dbcurs.close()
dbconn.close()
def do_listsource(options):
dbconn = dbaccess.QueryConnection(options.database)
dbcurs = dbconn.cursor()
shortname = None
for shortname, sourcefile in dbcurs.listsource(options.pattern):
sys.stdout.write('%-16s %s\n' % (shortname, sourcefile))
if shortname is None:
sys.stderr.write('No matching systems found for \'%s\'\n' % (options.pattern, ))
dbcurs.close()
dbconn.close()
def do_listclones(options):
dbconn = dbaccess.QueryConnection(options.database)
dbcurs = dbconn.cursor()
first = True
for shortname, parent in dbcurs.listclones(options.pattern):
if first:
sys.stdout.write('Name: Clone of:\n')
first = False
sys.stdout.write('%-16s %s\n' % (shortname, parent))
if first:
count = dbcurs.count_systems(options.pattern).fetchone()[0]
if count:
sys.stderr.write('Found %d match(es) for \'%s\' but none were clones\n' % (count, options.pattern))
else:
sys.stderr.write('No matching systems found for \'%s\'\n' % (options.pattern, ))
dbcurs.close()
dbconn.close()
def do_listbrothers(options):
dbconn = dbaccess.QueryConnection(options.database)
dbcurs = dbconn.cursor()
first = True
for sourcefile, shortname, parent in dbcurs.listbrothers(options.pattern):
if first:
sys.stdout.write('%-20s %-16s %s\n' % ('Source file:', 'Name:', 'Parent:'))
first = False
sys.stdout.write('%-20s %-16s %s\n' % (sourcefile, shortname, parent or ''))
if first:
sys.stderr.write('No matching systems found for \'%s\'\n' % (options.pattern, ))
dbcurs.close()
dbconn.close()
def do_listaffected(options):
dbconn = dbaccess.QueryConnection(options.database)
dbcurs = dbconn.cursor()
first = True
for shortname, description in dbcurs.listaffected(*options.pattern):
if first:
sys.stdout.write('Name: Description:\n')
first = False
sys.stdout.write('%-16s "%s"\n' % (shortname, description))
if first:
sys.stderr.write('No matching systems found for \'%s\'\n' % (options.pattern, ))
dbcurs.close()
dbconn.close()
def do_romident(options):
dbconn = dbaccess.QueryConnection(options.database)
dbcurs = dbconn.cursor()
ident = _Identifier(dbcurs)
for path in options.path:
ident.processPath(path)
ident.printResults()
dbcurs.close()
dbconn.close()
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