self.directory_entries = data.uint16l(17)
self.total_sectors = data.uint16l(19)
self.media_descriptor = data.uint8(21) # just set to 0xF8
self.sectors_per_fat = data.uint16l(22)
self.sectors_per_track = data.uint16l(24)
self.media_sides = data.uint16l(26)
self.hidden_sectors = data.uint32l(28)
self.extended_sector_count = data.uint32l(32)
self.total_size = self.sector_size * self.total_sectors
class EBPB(vesicle.Vesicle):
expected_length = 512
def __init__(self, b):
data = self.begin(b)
self.bpb = data.subparse(0, BPB)
self.drive_number = data.uint8(36) # just set to 0x80
self.reserved_flags = data.uint8(37)
self.signature = data.uint8(38) # just set to 0x29
self.serial_number = data.uint32l(39) # doesn't really matter
self.volume_label = data.ascii(43, length=11, padding=0x20)
self.system_identifier = data.ascii(54, length=8, padding=0x20)
self.boot_code = data.byte_array(62, length=448)
self.partition_signature = data.fixed(510, 0x55, 0xAA)
with open("test", "rb") as f:
synthase.compile(lambda x: EBPB(x).bpb.total_size, concrete_types.binary, rettype=concrete_types.u32)
print(EBPB(f.read(512)))
import synthase, concrete_types
def from_bytes_little(x):
return x[0] | (x[1] << 8) | (x[2] << 16) | (x[3] << 24)
def example(x):
return from_bytes_little(x[0:4]) * from_bytes_little(x[4:8])
def example2(x, y):
return (x + 2) * 10 - y * 2
def min_func(a, b):
return synthase.ifelse(a < b, a, b)
print(synthase.compile(min_func, concrete_types.binary, rettype=concrete_types.u32))
