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use crate::texture::Texture;
use crate::texture_decoder;
use crate::TextureParseError;
use byteorder::{LittleEndian, ReadBytesExt};
use encoding_rs::UTF_8;
use std::io::prelude::*;
use std::io::{Cursor, Read, Seek, SeekFrom};
type Result<T> = std::result::Result<T, TextureParseError>;
#[allow(dead_code)]
pub struct Header {
magic_id: u32,
backward_compatibility: u8,
forward_compatibility: u8,
version: u16,
contents_address: u32,
strings_address: u32,
commands_address: u32,
raw_data_address: u32,
raw_ext_address: u32,
relocation_address: u32,
contents_length: u32,
strings_length: u32,
commands_length: u32,
raw_data_length: u32,
raw_ext_length: u32,
relocation_length: u32,
uninit_data_length: u32,
uninit_commands_length: u32,
}
impl Header {
fn new(reader: &mut Cursor<&[u8]>) -> Result<Self> {
let magic_id = reader.read_u32::<LittleEndian>()?;
if magic_id != 0x484342 {
return Err(TextureParseError::BadMagicNumber);
}
let backward_compatibility = reader.read_u8()?;
let forward_compatibility = reader.read_u8()?;
let version = reader.read_u16::<LittleEndian>()?;
let contents_address = reader.read_u32::<LittleEndian>()?;
let strings_address = reader.read_u32::<LittleEndian>()?;
let commands_address = reader.read_u32::<LittleEndian>()?;
let raw_data_address = reader.read_u32::<LittleEndian>()?;
let raw_ext_address = if backward_compatibility > 20 {
reader.read_u32::<LittleEndian>()?
} else {
0
};
let relocation_address = reader.read_u32::<LittleEndian>()?;
let contents_length = reader.read_u32::<LittleEndian>()?;
let strings_length = reader.read_u32::<LittleEndian>()?;
let commands_length = reader.read_u32::<LittleEndian>()?;
let raw_data_length = reader.read_u32::<LittleEndian>()?;
let raw_ext_length = if backward_compatibility > 20 {
reader.read_u32::<LittleEndian>()?
} else {
0
};
let relocation_length = reader.read_u32::<LittleEndian>()?;
let uninit_data_length = reader.read_u32::<LittleEndian>()?;
let uninit_commands_length = reader.read_u32::<LittleEndian>()?;
Ok(Header {
magic_id,
backward_compatibility,
forward_compatibility,
version,
contents_address,
strings_address,
commands_address,
raw_data_address,
raw_ext_address,
relocation_address,
contents_length,
strings_length,
commands_length,
raw_data_length,
raw_ext_length,
relocation_length,
uninit_data_length,
uninit_commands_length,
})
}
}
pub struct ContentTable {
textures_ptr_table_offset: u32,
textures_ptr_table_entries: u32,
}
impl ContentTable {
fn new(reader: &mut Cursor<&[u8]>, contents_address: u32) -> Result<Self> {
reader.seek(SeekFrom::Start((contents_address + 0x24).into()))?;
let textures_ptr_table_offset = reader.read_u32::<LittleEndian>()? + contents_address;
let textures_ptr_table_entries = reader.read_u32::<LittleEndian>()?;
Ok(ContentTable {
textures_ptr_table_offset,
textures_ptr_table_entries,
})
}
}
pub fn read(file: &[u8]) -> Result<Vec<Texture>> {
let mut reader = Cursor::new(file);
let header = Header::new(&mut reader)?;
reader.seek(SeekFrom::Start(header.contents_address.into()))?;
let content_table = ContentTable::new(&mut reader, header.contents_address)?;
let mut bch: Vec<Texture> = Vec::new();
for entry in 0..content_table.textures_ptr_table_entries {
reader.seek(SeekFrom::Start(
(content_table.textures_ptr_table_offset + entry * 4).into(),
))?;
let dest = reader.read_u32::<LittleEndian>()?;
reader.seek(SeekFrom::Start((dest + header.contents_address).into()))?;
let tex_unit0_commands_offset =
reader.read_u32::<LittleEndian>()? + header.commands_address;
reader.seek(SeekFrom::Current(24))?;
let name_offset = reader.read_u32::<LittleEndian>()?;
reader.seek(SeekFrom::Start(
(header.strings_address + name_offset).into(),
))?;
let mut filename_buffer: Vec<u8> = Vec::new();
reader.read_until(0x0, &mut filename_buffer)?;
filename_buffer.pop();
let (result, _, errors) = UTF_8.decode(filename_buffer.as_slice());
if errors {
return Err(TextureParseError::BadText);
}
let filename: String = result.into();
reader.seek(SeekFrom::Start(tex_unit0_commands_offset.into()))?;
let height = reader.read_u16::<LittleEndian>()? as usize;
let width = reader.read_u16::<LittleEndian>()? as usize;
reader.seek(SeekFrom::Current(0xC))?;
let data_offset = reader.read_u32::<LittleEndian>()? + header.raw_data_address;
reader.seek(SeekFrom::Current(0x4))?;
let pixel_format = reader.read_u32::<LittleEndian>()?;
reader.seek(SeekFrom::Start(data_offset.into()))?;
let mut pixel_data: Vec<u8> = vec![
0;
(texture_decoder::get_pixel_format_bpp(pixel_format) * width as f32 * height as f32)
as usize
];
reader.read_exact(&mut pixel_data)?;
let pixel_data =
texture_decoder::decode_pixel_data(&pixel_data, width, height, pixel_format)?;
bch.push(Texture {
filename,
height,
width,
pixel_data,
});
}
Ok(bch)
}