1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141

use std::io::{Read,Seek,SeekFrom};

use nom::IResult;
use nom::number::complete::le_u32;
use nom::bytes::complete::tag;
use nom::combinator::all_consuming;
use nom::multi::count;

use crate::{Error,Decode};
use crate::shared::decode_rle_string;
use crate::Entry;

use super::{
    Stb,
    StbHeader,
    StbEntriesHeader,
    StbEntry,
    StbEntryExtras,
};

impl Decode for Stb {
    fn decode<Source>(source: &mut Source) -> Result<Self, Error> where
        Source: Read + Seek
    {
        let mut header_buf = [0; 32];
        let mut entries_header_buf = [0; 12];
        let mut entries_buf = Vec::new();

        source.read_exact(&mut header_buf)?;
        let (_, header) = all_consuming(Stb::decode_header)(&header_buf)?;

        source.seek(SeekFrom::Start(header.entries_offset as u64))?;
        source.read_exact(&mut entries_header_buf)?;
        let (_, entries_header) = all_consuming(Stb::decode_entries_header)(&header_buf)?;

        source.read_to_end(&mut entries_buf)?;
        let (_, entries) = count(Stb::decode_entry, header.files_count as usize)(&entries_buf)?;

        Ok(Stb { header: header, entries_header: entries_header, entries: entries })
    }
}

impl Stb {
    pub fn decode_header(input: &[u8]) -> IResult<&[u8], StbHeader, Error> {
        let (input, _magic_number) = tag("BBBB")(input)?;
        let (input, version) = le_u32(input)?;
        let (input, _unknown_1) = le_u32(input)?;
        let (input, _unknown_2) = le_u32(input)?;
        let (input, header_size) = le_u32(input)?;
        let (input, files_count) = le_u32(input)?;
        let (input, levels_count) = le_u32(input)?;
        let (input, entries_offset) = le_u32(input)?;

        Ok(
            (
                input,
                StbHeader {
                    version: version,
                    header_size: header_size,
                    files_count: files_count,
                    levels_count: levels_count,
                    entries_offset: entries_offset,
                }
            )
        )
    }

    pub fn decode_entries_header(input: &[u8]) -> IResult<&[u8], StbEntriesHeader, Error> {
        let (input, start) = le_u32(input)?;
        let (input, _null) = le_u32(input)?;
        let (input, levels_count) = le_u32(input)?;

        Ok(
            (
                input,
                StbEntriesHeader {
                    start: start,
                    levels_count: levels_count,
                }
            )
        )
    }

    pub fn decode_entry(input: &[u8]) -> IResult<&[u8], StbEntry, Error> {
        let (input, listing_start) = le_u32(input)?;
        let (input, id) = le_u32(input)?;
        let (input, _null) = le_u32(input)?;
        let (input, length) = le_u32(input)?;
        let (input, offset) = le_u32(input)?;
        let (input, _null) = le_u32(input)?;
        let (input, name_1) = decode_rle_string(input)?;
        let (input, _null) = le_u32(input)?;
        let (input, _unknown_1) = le_u32(input)?;
        let (input, name_2) = decode_rle_string(input)?;
        let (input, bytes_left) = le_u32(input)?;

        // These aren't very useful until they can be understood.

        let (input, extras) =
            // TODO: Is this being misused? Maybe there can be different sized extras.
            if bytes_left != 0 {
                let (input, field_1) = le_u32(input)?;
                let (input, field_2) = le_u32(input)?;
                let (input, field_3) = le_u32(input)?;
                let (input, field_4) = le_u32(input)?;
                (
                    input,
                    Some(
                        StbEntryExtras {
                            field_1: field_1,
                            field_2: field_2,
                            field_3: field_3,
                            field_4: field_4,
                        }
                    )
                )
            } else {
                (input, None)
            };

        Ok(
            (
                input,
                StbEntry {
                    listing_start: listing_start,
                    id: id,
                    length: length,
                    offset: offset,
                    name_1: name_1,
                    name_2: name_2,
                    extras: extras,
                }
            )
        )
    }
}

impl Entry for StbEntry {
    fn len(&self) -> u64 { self.length as u64 }
    fn pos(&self) -> u64 { self.offset as u64 }
}