imagesize/formats/
gif.rs

1use crate::{
2    util::{read_u16, Endian},
3    ImageResult, ImageSize,
4};
5use std::io::{BufRead, Seek, SeekFrom};
6
7pub fn size<R: BufRead + Seek>(reader: &mut R) -> ImageResult<ImageSize> {
8    reader.seek(SeekFrom::Start(6))?;
9
10    Ok(ImageSize {
11        width: read_u16(reader, &Endian::Little)? as usize,
12        height: read_u16(reader, &Endian::Little)? as usize,
13    })
14}
15
16pub fn matches(header: &[u8]) -> bool {
17    header.starts_with(b"GIF8")
18}