imageinfo 0.7.27

Rust library to get image size and format without loading/decoding.
Documentation 
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use crate::{ImageFormat, ImageInfo, ImageInfoError, ImageInfoResult, ImageSize, ReadInterface};
use std::io::{BufRead, Seek};

pub fn try_dds<R>(ri: &mut ReadInterface<R>, length: usize) -> ImageInfoResult<ImageInfo>
where
    R: BufRead + Seek,
{
    if length < 20 {
        return Err(ImageInfoError::UnrecognizedFormat);
    }
    let buffer = ri.read(0, 20)?;
    if !buffer.cmp(0, 4, b"DDS ") {
        return Err(ImageInfoError::UnrecognizedFormat);
    }

    Ok(ImageInfo {
        format: ImageFormat::DDS,
        ext: "dds",
        full_ext: "dds",
        mimetype: "image/dds",
        size: ImageSize {
            width: buffer.read_u32_le(16) as i64,
            height: buffer.read_u32_le(12) as i64,
        },
        entry_sizes: vec![],
    })
}