meta: id: ico title: Microsoft Windows icon file file-extension: ico xref: justsolve: ICO mime: - image/x-icon - image/vnd.microsoft.icon pronom: x-fmt/418 wikidata: Q729366 tags: - windows license: CC0-1.0 endian: le doc: | Microsoft Windows uses specific file format to store applications icons - ICO. This is a container that contains one or more image files (effectively, DIB parts of BMP files or full PNG files are contained inside). doc-ref: https://learn.microsoft.com/en-us/previous-versions/ms997538(v=msdn.10) seq: - id: magic contents: [0, 0, 1, 0] - id: num_images -orig-id: idCount type: u2 doc: Number of images contained in this file - id: images -orig-id: idEntries type: icon_dir_entry repeat: expr repeat-expr: num_images types: icon_dir_entry: -orig-id: ICONDIRENTRY seq: - id: width -orig-id: bWidth type: u1 doc: Width of image, px - id: height -orig-id: bHeight type: u1 doc: Height of image, px - id: num_colors -orig-id: bColorCount type: u1 doc: | Number of colors in palette of the image or 0 if image has no palette (i.e. RGB, RGBA, etc) - id: reserved -orig-id: bReserved contents: [0] - id: num_planes -orig-id: wPlanes type: u2 doc: Number of color planes - id: bpp -orig-id: wBitCount type: u2 doc: Bits per pixel in the image - id: len_img -orig-id: dwBytesInRes type: u4 doc: Size of the image data - id: ofs_img -orig-id: dwImageOffset type: u4 doc: Absolute offset of the image data start in the file instances: img: pos: ofs_img size: len_img doc: | Raw image data. Use `is_png` to determine whether this is an embedded PNG file (true) or a DIB bitmap (false) and call a relevant parser, if needed to parse image data further. png_header: pos: ofs_img size: 8 doc: | Pre-reads first 8 bytes of the image to determine if it's an embedded PNG file. is_png: value: png_header == [137, 80, 78, 71, 13, 10, 26, 10] doc: True if this image is in PNG format.