1use std::io::{BufRead, Seek, SeekFrom};
2
3use crate::{
4 util::{read_u32, Endian},
5 ImageResult, ImageSize,
6};
7
8pub fn size<R: BufRead + Seek>(reader: &mut R) -> ImageResult<ImageSize> {
9 reader.seek(pos:SeekFrom::Start(16))?;
10
11 let width: usize = read_u32(reader, &Endian::Little)? as usize;
12 let height: usize = read_u32(reader, &Endian::Little)? as usize;
13
14 Ok(ImageSize { width, height })
15}
16
17pub fn matches(header: &[u8]) -> bool {
18 let ktx2_identifier: [u8; 12] = [
19 0xAB, 0x4B, 0x54, 0x58, 0x20, 0x32, 0x30, 0xBB, 0x0D, 0x0A, 0x1A, 0x0A,
20 ];
21 header.starts_with(&ktx2_identifier)
22}
23