def pfactory(**kwds):
keys = 'length modrm imm reg'.split(' ')
res = prop([(k, None) for k in keys])
for k,v in kwds.items():
res[k] = v
return res
def decode(s):
'''given an iterable s, return the next valid instruction'''
s = iter(s)
size = 0
keys = 'prefix opcode modrm sib disp imm size'.split(' ')
res = prop([(k, None) for k in keys])
res['prefix'] = []
## prefixes
for x in range(4):
v = s.next()
size += 1
if ord(v) in prefix:
res['prefix'].append(v)
continue
break
## rex prefixes
# j/k
## opcode
row = optable[ ord(v) ]
opcode = str(v)
if row[0] == '>':
tbl = table[row[1]]
v = s.next()
row = tbl[ ord(v) ]
opcode += v
args = row[2]
res['opcode'] = opcode
## modrm / sib
if args['modrm']:
res['modrm'] = s.next()
mod,reg,rm = modrm(res['modrm'])
size += 1
if mod < 3 and rm == 4:
res['sib'] = True
if mod == 0 and rm == 5:
res['disp'] = 4
if mod == 1:
res['disp'] = 1
if mod == 2:
res['disp'] = 4
if res['sib']:
res['sib'] = s.next()
size += 1
## displacement
if res['disp']:
length = res['disp']
res['disp'] = ''.join([x for i,x in zip(range(length), s)])
size += length
## immediate
if args['imm']:
length = args['length']( 0x66 not in res['prefix'] )
res['imm'] = ''.join([x for i,x in zip(range(length), s)])
size += length
res['size'] = size
return res
def decode(s):
'''given an iterable s, return the next valid instruction'''
s = iter(s)
size = 0
keys = 'prefix opcode modrm sib disp imm size'.split(' ')
res = prop([(k, None) for k in keys])
res['prefix'] = []
## prefixes
for x in range(4):
v = s.next()
size += 1
if ord(v) in prefix:
res['prefix'].append(v)
continue
break
## rex prefixes
# j/k
## opcode
row = optable[ord(v)]
opcode = str(v)
if row[0] == '>':
tbl = table[row[1]]
v = s.next()
row = tbl[ord(v)]
opcode += v
args = row[2]
res['opcode'] = opcode
## modrm / sib
if args['modrm']:
res['modrm'] = s.next()
mod, reg, rm = modrm(res['modrm'])
size += 1
if mod < 3 and rm == 4:
res['sib'] = True
if mod == 0 and rm == 5:
res['disp'] = 4
if mod == 1:
res['disp'] = 1
if mod == 2:
res['disp'] = 4
if res['sib']:
res['sib'] = s.next()
size += 1
## displacement
if res['disp']:
length = res['disp']
res['disp'] = ''.join([x for i, x in zip(range(length), s)])
size += length
## immediate
if args['imm']:
length = args['length'](0x66 not in res['prefix'])
res['imm'] = ''.join([x for i, x in zip(range(length), s)])
size += length
res['size'] = size
return res
