filetypes 0.1.2

Determine file type via magic numbers.
Documentation 
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use super::{
    base::{new_type, HashMapTypeMatcher, Type},
    utils::image::{get_ftyp, is_iso_bmf},
};

const TYPE_JPEG: Type = new_type("image/jpeg", "jpg");
const TYPE_JPEG2000: Type = new_type("image/jp2", "jp2");
const TYPE_PNG: Type = new_type("image/png", "png");
const TYPE_GIF: Type = new_type("image/gif", "gif");
const TYPE_WEBP: Type = new_type("image/webp", "webp");
const TYPE_CR2: Type = new_type("image/x-canon-cr2", "cr2");
const TYPE_TIFF: Type = new_type("image/tiff", "tif");
const TYPE_BMP: Type = new_type("image/bmp", "bmp");
const TYPE_JXR: Type = new_type("image/vnd.ms-photo", "jxr");
const TYPE_PSD: Type = new_type("image/vnd.adobe.photosh", "psd");
const TYPE_ICO: Type = new_type("image/vnd.microsoft.ico", "ico");
const TYPE_HEIF: Type = new_type("image/heif", "heif");
const TYPE_DWG: Type = new_type("image/vnd.dwg", "dwg");
const TYPE_EXR: Type = new_type("image/x-exr", "exr");
const TYPE_AVIF: Type = new_type("image/avif", "avif");

fn is_jpeg(buf: &[u8]) -> bool {
    buf.len() > 2 && buf[..3] == [0xFF, 0xD8, 0xFF]
}

fn is_jpeg2000(buf: &[u8]) -> bool {
    buf.len() > 12
        && buf[..13]
            == [
                0x0, 0x0, 0x0, 0xC, 0x6A, 0x50, 0x20, 0x20, 0xD, 0xA, 0x87, 0xA, 0x0,
            ]
}

fn is_png(buf: &[u8]) -> bool {
    buf.len() > 3 && buf[..4] == [0x89, 0x50, 0x4E, 0x47]
}

fn is_gif(buf: &[u8]) -> bool {
    buf.len() > 2 && buf[..3] == [0x47, 0x49, 0x46]
}

fn is_webp(buf: &[u8]) -> bool {
    buf.len() > 11 && buf[8..12] == [0x57, 0x45, 0x42, 0x50]
}

fn is_cr2(buf: &[u8]) -> bool {
    buf.len() > 10 &&
    (
        buf[..4] == [0x49, 0x49, 0x2A, 0x00] || // Little Endian
        buf[..4] == [0x4D, 0x4D, 0x00, 0x2A] // Big Endian
    ) &&
    buf[8..10] == [0x43, 0x52] && // CR2 magic word
    buf[10] == 0x02 // CR2 major version
}

fn is_tiff(buf: &[u8]) -> bool {
    buf.len() > 10
        && (
            buf[..4] == [ 0x49, 0x49, 0x2A, 0x00 ] || // Little Endian
        buf[..4] == [ 0x4D, 0x4D, 0x00, 0x2A ]
            // Big Endian
        )
        && !is_cr2(buf) // To avoid conflicts differentiate Tiff from CR2
}

fn is_bmp(buf: &[u8]) -> bool {
    buf.len() > 1 && buf[..2] == [0x42, 0x4D]
}

fn is_jxr(buf: &[u8]) -> bool {
    buf.len() > 2 && buf[..3] == [0x49, 0x49, 0xBC]
}

fn is_psd(buf: &[u8]) -> bool {
    buf.len() > 3 && buf[..4] == [0x38, 0x42, 0x50, 0x53]
}

fn is_ico(buf: &[u8]) -> bool {
    buf.len() > 3 && buf[..4] == [0x00, 0x00, 0x01, 0x00]
}

fn is_heif(buf: &[u8]) -> bool {
    if !is_iso_bmf(buf) {
        return false;
    }

    let (major_brand, _, compatible_brands) = get_ftyp(buf);
    if major_brand == "heic" {
        return true;
    }

    if major_brand == "mif1" || major_brand == "msf1" {
        for cb in compatible_brands {
            if cb == "heic" {
                return true;
            }
        }
    }

    false
}

fn is_dwg(buf: &[u8]) -> bool {
    buf.len() > 3 && buf[..4] == [0x41, 0x43, 0x31, 0x30]
}

fn is_exr(buf: &[u8]) -> bool {
    buf.len() > 3 && buf[..4] == [0x76, 0x2f, 0x31, 0x01]
}

fn is_avif(buf: &[u8]) -> bool {
    if !is_iso_bmf(buf) {
        return false;
    }

    let (major_brand, _, compatible_brands) = get_ftyp(buf);
    if major_brand == "avif" {
        return true;
    }

    if major_brand == "mif1" || major_brand == "msf1" {
        for cb in compatible_brands {
            if cb == "avif" {
                return true;
            }
        }
    }
    false
}

pub fn sum() -> HashMapTypeMatcher {
    let mut ret = HashMapTypeMatcher::new();

    ret.insert(TYPE_JPEG, is_jpeg);
    ret.insert(TYPE_JPEG2000, is_jpeg2000);
    ret.insert(TYPE_PNG, is_png);
    ret.insert(TYPE_GIF, is_gif);
    ret.insert(TYPE_WEBP, is_webp);
    ret.insert(TYPE_CR2, is_cr2);
    ret.insert(TYPE_TIFF, is_tiff);
    ret.insert(TYPE_BMP, is_bmp);
    ret.insert(TYPE_JXR, is_jxr);
    ret.insert(TYPE_PSD, is_psd);
    ret.insert(TYPE_ICO, is_ico);
    ret.insert(TYPE_HEIF, is_heif);
    ret.insert(TYPE_DWG, is_dwg);
    ret.insert(TYPE_EXR, is_exr);
    ret.insert(TYPE_AVIF, is_avif);

    ret
}