physis 0.5.0

Library for reading and writing FFXIV data.
Documentation 
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
142
143
144

// SPDX-FileCopyrightText: 2023 Joshua Goins <josh@redstrate.com>
// SPDX-License-Identifier: GPL-3.0-or-later

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

use binrw::{BinRead, BinWrite, binrw};
use data::{BlockHeader, CompressionMode};

use crate::common::{Platform, Region};
use crate::compression::no_header_decompress;

mod data;
pub use data::SqPackData;

mod db;
pub use db::SqPackDatabase;

mod index;
pub use index::{Hash, IndexEntry, SqPackIndex};

/// The type of this SqPack file.
#[binrw]
#[brw(repr = u8)]
#[derive(Debug)]
pub(crate) enum SqPackFileType {
    /// FFXIV Explorer says "SQDB", whatever that is.
    Sqdb = 0x0,
    /// Dat files.
    Data = 0x1,
    /// Index/Index2 files.
    Index = 0x2,
}

#[binrw]
#[brw(magic = b"SqPack\0\0")]
#[derive(Debug)]
pub(crate) struct SqPackHeader {
    #[brw(pad_size_to = 4)]
    platform_id: Platform,
    pub size: u32,
    // Have only seen version 1
    version: u32,
    #[brw(pad_size_to = 4)]
    file_type: SqPackFileType,

    // some unknown value, zeroed out for index files
    // XivAlexandar says date/time, where does that come from?
    unk1: u32,
    unk2: u32,

    #[br(pad_size_to = 4)]
    region: Region,

    #[brw(pad_before = 924)]
    #[brw(pad_after = 44)]
    // The SHA1 of the bytes immediately before this
    sha1_hash: [u8; 20],
}

pub(crate) fn read_data_block<T: Read + Seek>(
    mut buf: T,
    starting_position: u64,
) -> Option<Vec<u8>> {
    buf.seek(SeekFrom::Start(starting_position)).ok()?;

    let block_header = BlockHeader::read(&mut buf).unwrap();

    match block_header.compression {
        CompressionMode::Compressed {
            compressed_length,
            decompressed_length,
        } => {
            let mut compressed_data: Vec<u8> = vec![0; compressed_length as usize];
            buf.read_exact(&mut compressed_data).ok()?;

            let mut decompressed_data: Vec<u8> = vec![0; decompressed_length as usize];
            if !no_header_decompress(&mut compressed_data, &mut decompressed_data) {
                return None;
            }

            Some(decompressed_data)
        }
        CompressionMode::Uncompressed { file_size } => {
            let mut local_data: Vec<u8> = vec![0; file_size as usize];
            buf.read_exact(&mut local_data).ok()?;

            Some(local_data)
        }
    }
}

/// A fixed version of read_data_block accounting for differing compressed block sizes in ZiPatch files.
pub(crate) fn read_data_block_patch<T: Read + Seek>(mut buf: T) -> Option<Vec<u8>> {
    let block_header = BlockHeader::read(&mut buf).unwrap();

    match block_header.compression {
        CompressionMode::Compressed {
            compressed_length,
            decompressed_length,
        } => {
            let compressed_length: usize =
                ((compressed_length as usize + 143) & 0xFFFFFF80) - (block_header.size as usize);

            let mut compressed_data: Vec<u8> = vec![0; compressed_length];
            buf.read_exact(&mut compressed_data).ok()?;

            let mut decompressed_data: Vec<u8> = vec![0; decompressed_length as usize];
            if !no_header_decompress(&mut compressed_data, &mut decompressed_data) {
                return None;
            }

            Some(decompressed_data)
        }
        CompressionMode::Uncompressed { file_size } => {
            let new_file_size: usize = (file_size as usize + 143) & 0xFFFFFF80;

            let mut local_data: Vec<u8> = vec![0; file_size as usize];
            buf.read_exact(&mut local_data).ok()?;

            buf.seek(SeekFrom::Current(
                (new_file_size - block_header.size as usize - file_size as usize) as i64,
            ))
            .ok()?;

            Some(local_data)
        }
    }
}

pub(crate) fn write_data_block_patch<T: Write + Seek>(mut writer: T, data: Vec<u8>) {
    let new_file_size: usize = (data.len() + 143) & 0xFFFFFF80;

    // This only adds uncompressed data for now, to simplify implementation
    // TODO: write compressed blocks
    let block_header = BlockHeader {
        size: (new_file_size - data.len()) as u32, // TODO: i have no idea what this value is from
        compression: CompressionMode::Uncompressed {
            file_size: data.len() as i32,
        },
    };
    block_header.write(&mut writer).unwrap();

    data.write(&mut writer).unwrap();
}