class Write16(mrc.Block):
value = mrc.UInt16_BE(0x00)
@property
def repr(self):
return f'0x{self.value:04x}'
class ScriptChannelV4(mrc.Block):
index = mrc.UInt16_BE(0x00)
class SordV4(mrc.Block):
unk1 = mrc.Bytes(0x00, length=0xc)
count = mrc.UInt32_BE(0x0c)
unk2 = mrc.UInt16_BE(0x10)
unk3 = mrc.UInt16_BE(0x12)
index = mrc.UInt16_BE(0x14, count=mrc.Ref('count'))
def import_data(self, buffer, parent=None):
assert utils.is_bytes(buffer)
pattern_count = mrc.UInt16_BE(0x0000).get_from_buffer(buffer)
xor_mode = (pattern_count & 0x8000) != 0
pattern_count &= 0x7fff
index = 2
lut = {}
prev_pal_index = 0
while index < len(buffer):
test = buffer[index]
if test == 0xff:
break
elif test & 0x80:
code_raw = buffer[index + 2]
bit_count = buffer[index + 1] & 0x0f
code = ''.join([
'1' if (code_raw & (1 << i)) else '0'
for i in range(bit_count - 1, -1, -1)
])
lut[code] = {
'pal_index': buffer[index] & 0x0f,
'copy_count': ((buffer[index + 1] & 0xf0) >> 4) + 1,
}
prev_pal_index = lut[code]['pal_index']
index += 3
else:
code_raw = buffer[index + 1]
bit_count = buffer[index] & 0x0f
code = ''.join([
'1' if (code_raw & (1 << i)) else '0'
for i in range(bit_count - 1, -1, -1)
])
lut[code] = {
'pal_index': prev_pal_index,
'copy_count': ((buffer[index] & 0xf0) >> 4) + 1,
}
index += 2
bs = bits.BitStream(buffer[index + 1:], 0, bit_endian='big')
state = {
'output': bytearray(64 * pattern_count),
'output_index': 0,
'current_row': [],
'prev_row': bytearray(8)
}
def push_pal(pal, state):
state['current_row'].append(pal)
if len(state['current_row']) == 8:
output_index = state['output_index']
for i in range(8):
state['output'][output_index + i] = state['current_row'][i]
if xor_mode:
for i in range(8):
state['output'][output_index +
i] ^= state['prev_row'][i]
prev_row = state['output'][output_index:output_index + 8]
state['output_index'] += 8
state['current_row'].clear()
return
max_key_size = max([len(x) for x in lut.keys()])
while state['output_index'] < 64 * pattern_count:
test = ''
for i in range(max_key_size):
test += '1' if bs.read(1) else '0'
if test in lut or test == '111111':
break
if test in lut:
for i in range(lut[test]['copy_count']):
push_pal(lut[test]['pal_index'], state)
elif test == '111111':
copy_count = bs.read(3)
pal_index = bs.read(4)
for i in range(copy_count):
push_pal(pal_index, state)
else:
raise Exception('Invalid code found in data stream, aborting')
return bytes(state['output'])
class OddRecord(mrc.Block):
"""Represents an alternative set of conditions for a level.
Used in Lemmings to repeat the same level with a different difficulty.
"""
#: Minimum Lemming release-rate.
release_rate = mrc.UInt16_BE(0x0000, range=range(0, 251))
#: Number of Lemmings released.
num_released = mrc.UInt16_BE(0x0002, range=range(0, 115))
#: Number of Lemmings required to be saved.
num_to_save = mrc.UInt16_BE(0x0004, range=range(0, 115))
#: Time limit for the level (minutes).
time_limit_mins = mrc.UInt16_BE(0x0006, range=range(0, 256))
#: Number of Climber skills.
num_climbers = mrc.UInt16_BE(0x0008, range=range(0, 251))
#: Number of Floater skills.
num_floaters = mrc.UInt16_BE(0x000a, range=range(0, 251))
#: Number of Bomber skills.
num_bombers = mrc.UInt16_BE(0x000c, range=range(0, 251))
#: Number of Blocker skills.
num_blockers = mrc.UInt16_BE(0x000e, range=range(0, 251))
#: Number of Builder skills.
num_builders = mrc.UInt16_BE(0x0010, range=range(0, 251))
#: Number of Basher skills.
num_bashers = mrc.UInt16_BE(0x0012, range=range(0, 251))
#: Number of Miner skills.
num_miners = mrc.UInt16_BE(0x0014, range=range(0, 251))
#: Number of Digger skills.
num_diggers = mrc.UInt16_BE(0x0016, range=range(0, 251))
#: Name of the level (ASCII string).
name = mrc.Bytes(0x0018,
length=32,
default=b' ')
@property
def repr(self):
return self.name.strip().decode('utf8')
class Level(mrc.Block):
"""Represents a single Lemmings level."""
#: Minimum Lemming release-rate.
release_rate = mrc.UInt16_BE(0x0000, range=range(0, 251))
#: Number of Lemmings released.
num_released = mrc.UInt16_BE(0x0002, range=range(0, 115))
#: Number of Lemmings required to be saved.
num_to_save = mrc.UInt16_BE(0x0004, range=range(0, 115))
#: Time limit for the level (minutes).
time_limit_mins = mrc.UInt16_BE(0x0006, range=range(0, 256))
#: Number of Climber skills.
num_climbers = mrc.UInt16_BE(0x0008, range=range(0, 251))
#: Number of Floater skills.
num_floaters = mrc.UInt16_BE(0x000a, range=range(0, 251))
#: Number of Bomber skills.
num_bombers = mrc.UInt16_BE(0x000c, range=range(0, 251))
#: Number of Blocker skills.
num_blockers = mrc.UInt16_BE(0x000e, range=range(0, 251))
#: Number of Builder skills.
num_builders = mrc.UInt16_BE(0x0010, range=range(0, 251))
#: Number of Basher skills.
num_bashers = mrc.UInt16_BE(0x0012, range=range(0, 251))
#: Number of Miner skills.
num_miners = mrc.UInt16_BE(0x0014, range=range(0, 251))
#: Number of Digger skills.
num_diggers = mrc.UInt16_BE(0x0016, range=range(0, 251))
#: Raw value for the start x position of the camera.
camera_x_raw = mrc.UInt16_BE(0x0018, range=range(0, 1265))
#: Index denoting which graphical Style to use.
style_index = mrc.UInt16_BE(0x001a)
#: Index denoting which Special graphic to use (optional).
custom_index = mrc.UInt16_BE(0x001c)
#: List of Interactive object references (32 slots).
interactives = mrc.BlockField(Interactive,
0x0020,
count=32,
fill=b'\x00' * 8)
#: List of Terrain object references (400 slots).
terrains = mrc.BlockField(Terrain, 0x0120, count=400, fill=b'\xff' * 4)
#: List of SteelArea object references (32 slots).
steel_areas = mrc.BlockField(SteelArea, 0x0760, count=32, fill=b'\x00' * 4)
#: Name of the level (ASCII string).
name = mrc.Bytes(0x07e0,
length=32,
default=b' ')
@property
def camera_x(self):
"""Start x position of the camera."""
return self.camera_x_raw - (self.camera_x_raw % 8)
@property
def repr(self):
return self.name.strip().decode('utf8')
class Test(mrc.Block):
field1 = mrc.UInt16_BE(0x00)
field2 = mrc.Int32_LE()
field3 = mrc.Bits8(0x08, bits=0b00111100)
field4 = mrc.Bits8(0x08, bits=0b11000011)
field5 = mrc.Int8(enum=TestEnum)
class ChannelV4(mrc.Block):
channel_size = mrc.UInt16_BE(0x00)
channel_offset = mrc.UInt16_BE(0x02)
data = mrc.Bytes(0x04, length=mrc.Ref('channel_size'))