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use nom::{be_u8, be_u16, be_u32, le_u32, IResult};
use super::MscsbFile;
use super::super::{Cmd, Command, Script};
fn get_nom_position(input: &[u8], input_size: usize) -> IResult<&[u8], usize> {
let remaining = input.len();
do_parse!(input, (input_size - remaining))
}
fn take_script(input: &[u8], position: usize) -> IResult<&[u8], Script> {
do_parse!(
input,
commands: many0!(complete!(
do_parse!(
pos: apply!(get_nom_position, input.len()) >>
cmd: apply!(take_cmd, pos) >>
(cmd)
))) >>
size: apply!(get_nom_position, input.len()) >>
(Script {
bounds: (position as u32, (position + size) as u32),
commands
})
)
}
pub fn str_from_u8_nul_utf8(utf8_src: &[u8]) -> Result<&str, std::str::Utf8Error> {
let nul_range_end = utf8_src.iter()
.position(|&c| c == b'\0')
.unwrap_or(utf8_src.len()); // default to length if no `\0` present
::std::str::from_utf8(&utf8_src[0..nul_range_end])
}
pub fn take_file(input: &[u8]) -> IResult<&[u8], MscsbFile> {
do_parse!(
input,
tag!(b"\xB2\xAC\xBC\xBA\xE6\x90\x32\x01\xFD\x02\x00\x00\x00\x00\x00\x00") >>
script_data_size: le_u32 >>
entrypoint: le_u32 >>
script_count: le_u32 >>
_unk: le_u32 >>
string_size: le_u32 >>
string_count: le_u32 >>
_padding: take!(8) >>
script_data: take!(script_data_size) >>
_padding: take!((0x10 - (script_data_size & 0xF)) & 0xF) >> // pad to 0x10
script_offsets: count!(le_u32, script_count as usize) >>
_padding: take!((0x10 - ((script_count * 4) & 0xF)) & 0xF) >> // pad to 0x10
strings: count!(take!(string_size), string_count as usize) >>
({
let mut script_offsets = script_offsets.clone();
script_offsets.sort();
script_offsets.push(script_data_size);
let scripts =
(0..script_offsets.len() - 1)
.filter_map(|i| {
Some(do_parse!(
&script_data[script_offsets[i] as usize..script_offsets[i+1] as usize],
script: complete!(apply!(take_script, script_offsets[i] as usize)) >>
(script)
).unwrap().1)
})
.collect();
let strings =
strings
.iter()
.map(|s|
String::from(
str_from_u8_nul_utf8(s).unwrap_or("[UTF-8 Error]")
)).collect();
MscsbFile {
scripts,
strings,
entrypoint
}
})
)
}
fn take_cmd(input: &[u8], position: usize) -> IResult<&[u8], Command> {
do_parse!(
input,
cmd_num: be_u8 >>
cmd: switch!(value!(cmd_num & 0x7F, take!(0)),
0 => value!(Cmd::Nop, take!(0)) |
1 => value!(Cmd::Unk1, take!(0)) |
2 => do_parse!(
arg_count: be_u16 >>
var_count: be_u16 >>
(Cmd::Begin {
arg_count,
var_count
})
) |
3 => value!(Cmd::End, take!(0)) |
4 => do_parse!(
loc: be_u32 >>
(Cmd::Jump {
loc
})
) |
5 => do_parse!(
loc: be_u32 >>
(Cmd::Jump5 {
loc
})
) |
6 => value!(Cmd::Return6, take!(0)) |
7 => value!(Cmd::Return7, take!(0)) |
8 => value!(Cmd::Return8, take!(0)) |
9 => value!(Cmd::Return9, take!(0)) |
0xA => do_parse!(
val: be_u32 >>
(Cmd::PushInt {
val
})
) |
0xB => do_parse!(
var_type: be_u8 >>
var_num: be_u16 >>
(Cmd::PushVar {
var_type,
var_num
})
) |
0xC => value!(Cmd::ErrorC, take!(0)) |
0xD => do_parse!(
val: be_u16 >>
(Cmd::PushShort {
val
})
) |
0xE => value!(Cmd::AddI, take!(0)) |
0xF => value!(Cmd::SubI, take!(0)) |
0x10 => value!(Cmd::MultI, take!(0)) |
0x11 => value!(Cmd::DivI, take!(0)) |
0x12 => value!(Cmd::ModI, take!(0)) |
0x13 => value!(Cmd::NegI, take!(0)) |
0x14 => do_parse!(
var_type: be_u8 >>
var_num: be_u16 >>
(Cmd::IncI {
var_type,
var_num
})
) |
0x15 => do_parse!(
var_type: be_u8 >>
var_num: be_u16 >>
(Cmd::DecI {
var_type,
var_num
})
) |
0x16 => value!(Cmd::AndI, take!(0)) |
0x17 => value!(Cmd::OrI, take!(0)) |
0x18 => value!(Cmd::NotI, take!(0)) |
0x19 => value!(Cmd::XorI, take!(0)) |
0x1A => value!(Cmd::ShiftL, take!(0)) |
0x1B => value!(Cmd::ShiftR, take!(0)) |
0x1C => do_parse!(
var_type: be_u8 >>
var_num: be_u16 >>
(Cmd::SetVar {
var_type,
var_num
})
) |
0x1D => do_parse!(
var_type: be_u8 >>
var_num: be_u16 >>
(Cmd::AddVarBy {
var_type,
var_num
})
) |
0x1E => do_parse!(
var_type: be_u8 >>
var_num: be_u16 >>
(Cmd::SubVarBy {
var_type,
var_num
})
) |
0x1F => do_parse!(
var_type: be_u8 >>
var_num: be_u16 >>
(Cmd::MultVarBy {
var_type,
var_num
})
) |
0x20 => do_parse!(
var_type: be_u8 >>
var_num: be_u16 >>
(Cmd::DivVarBy {
var_type,
var_num
})
) |
0x21 => do_parse!(
var_type: be_u8 >>
var_num: be_u16 >>
(Cmd::ModVarBy {
var_type,
var_num
})
) |
0x22 => do_parse!(
var_type: be_u8 >>
var_num: be_u16 >>
(Cmd::AndVarBy {
var_type,
var_num
})
) |
0x23 => do_parse!(
var_type: be_u8 >>
var_num: be_u16 >>
(Cmd::OrVarBy {
var_type,
var_num
})
) |
0x24 => do_parse!(
var_type: be_u8 >>
var_num: be_u16 >>
(Cmd::XorVarBy {
var_type,
var_num
})
) |
0x25 => value!(Cmd::Equals, take!(0)) |
0x26 => value!(Cmd::NotEquals, take!(0)) |
0x27 => value!(Cmd::LessThan, take!(0)) |
0x28 => value!(Cmd::LessOrEqual, take!(0)) |
0x29 => value!(Cmd::Greater, take!(0)) |
0x2A => value!(Cmd::GreaterOrEqual, take!(0)) |
0x2B => value!(Cmd::Not, take!(0)) |
0x2C => do_parse!(
arg_count: be_u8 >>
(Cmd::PrintF {
arg_count
})
) |
0x2D => do_parse!(
arg_count: be_u8 >>
sys_num: be_u8 >>
(Cmd::Sys {
arg_count,
sys_num
})
) |
0x2E => do_parse!(
loc: be_u32 >>
(Cmd::Try {
loc
})
) |
0x2F => do_parse!(
arg_count: be_u8 >>
(Cmd::CallFunc {
arg_count
})
) |
0x30 => do_parse!(
arg_count: be_u8 >>
(Cmd::CallFunc2 {
arg_count
})
) |
0x31 => do_parse!(
arg_count: be_u8 >>
(Cmd::CallFunc3 {
arg_count
})
) |
0x32 => value!(Cmd::Push, take!(0)) |
0x33 => value!(Cmd::Pop, take!(0)) |
0x34 => do_parse!(
loc: be_u32 >>
(Cmd::If {
loc
})
) |
0x35 => do_parse!(
loc: be_u32 >>
(Cmd::IfNot {
loc
})
) |
0x36 => do_parse!(
loc: be_u32 >>
(Cmd::Else {
loc
})
) |
0x37 => value!(Cmd::Error37, take!(0)) |
0x38 => do_parse!(
stack_pos: be_u8 >>
(Cmd::IntToFloat {
stack_pos
})
) |
0x39 => do_parse!(
stack_pos: be_u8 >>
(Cmd::FloatToInt {
stack_pos
})
) |
0x3A => value!(Cmd::AddF, take!(0)) |
0x3B => value!(Cmd::SubF, take!(0)) |
0x3C => value!(Cmd::MultF, take!(0)) |
0x3D => value!(Cmd::DivF, take!(0)) |
0x3E => value!(Cmd::NegF, take!(0)) |
0x3F => do_parse!(
var_type: be_u8 >>
var_num: be_u16 >>
(Cmd::IncF {
var_type,
var_num
})
) |
0x40 => do_parse!(
var_type: be_u8 >>
var_num: be_u16 >>
(Cmd::DecF {
var_type,
var_num
})
) |
0x41 => do_parse!(
var_type: be_u8 >>
var_num: be_u16 >>
(Cmd::VarSetF {
var_type,
var_num
})
) |
0x42 => do_parse!(
var_type: be_u8 >>
var_num: be_u16 >>
(Cmd::AddVarByF {
var_type,
var_num
})
) |
0x43 => do_parse!(
var_type: be_u8 >>
var_num: be_u16 >>
(Cmd::SubVarByF {
var_type,
var_num
})
) |
0x44 => do_parse!(
var_type: be_u8 >>
var_num: be_u16 >>
(Cmd::MultVarByF {
var_type,
var_num
})
) |
0x45 => do_parse!(
var_type: be_u8 >>
var_num: be_u16 >>
(Cmd::DivVarByF {
var_type,
var_num
})
) |
0x46 => value!(Cmd::EqualsF, take!(0)) |
0x47 => value!(Cmd::NotEqualsF, take!(0)) |
0x48 => value!(Cmd::LessThanF, take!(0)) |
0x49 => value!(Cmd::LessOrEqualF, take!(0)) |
0x4A => value!(Cmd::GreaterF, take!(0)) |
0x4B => value!(Cmd::GreaterOrEqualF, take!(0)) |
0x4C => value!(Cmd::Error4C, take!(0)) |
0x4D => value!(Cmd::Exit, take!(0))
) >>
({
Command {
position: position as u32,
push_bit: cmd_num & 0x80 == 0x80,
cmd
}
})
)
}