ImageFormat

pub const ImageFormat = enum(u2)

File

Code

pub const ImageFormat = enum(u2) {
    dib,
    png,
    riff,

    const riff_header = std.mem.readInt(u32, "RIFF", native_endian);
    const png_signature = std.mem.readInt(u64, "\x89PNG\r\n\x1a\n", native_endian);
    const ihdr_code = std.mem.readInt(u32, "IHDR", native_endian);
    const acon_form_type = std.mem.readInt(u32, "ACON", native_endian);

    pub fn detect(header_bytes: *const [16]u8) ImageFormat {
        if (std.mem.readInt(u32, header_bytes[0..4], native_endian) == riff_header) return .riff;
        if (std.mem.readInt(u64, header_bytes[0..8], native_endian) == png_signature) return .png;
        return .dib;
    }

    pub fn validate(format: ImageFormat, header_bytes: *const [16]u8) bool {
        return switch (format) {
            .png => std.mem.readInt(u32, header_bytes[12..16], native_endian) == ihdr_code,
            .riff => std.mem.readInt(u32, header_bytes[8..12], native_endian) == acon_form_type,
            .dib => true,
        };
    }
}