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 odinfmt.json
 example/example
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 {
    // Use IntelliSense to learn about possible attributes.
    // Hover to view descriptions of existing attributes.
    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
    "version": "0.2.0",
    "configurations": [
        {
            "name": "Debug (CPPDBG)",
            "type": "cppdbg",
            "request": "launch",
            "program": "${workspaceFolder}/example/example",
            "args": ["${workspaceFolder}/example/colors_wcg_hdr_rec2020.avif"],
            "cwd": "${workspaceRoot}",
        }
    ]
 }
@@ -0,0 +1,674 @@
                    GNU GENERAL PUBLIC LICENSE
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 notice like this when it starts in an interactive mode:
    <program>  Copyright (C) <year>  <name of author>
    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
    This is free software, and you are welcome to redistribute it
    under certain conditions; type `show c' for details.
 The hypothetical commands `show w' and `show c' should show the appropriate
 parts of the General Public License.  Of course, your program's commands
 might be different; for a GUI interface, you would use an "about box".
  You should also get your employer (if you work as a programmer) or school,
 if any, to sign a "copyright disclaimer" for the program, if necessary.
 For more information on this, and how to apply and follow the GNU GPL, see
 <https://www.gnu.org/licenses/>.
  The GNU General Public License does not permit incorporating your program
 into proprietary programs.  If your program is a subroutine library, you
 may consider it more useful to permit linking proprietary applications with
 the library.  If this is what you want to do, use the GNU Lesser General
 Public License instead of this License.  But first, please read
 <https://www.gnu.org/licenses/why-not-lgpl.html>.
@@ -0,0 +1,15 @@
 Decoder:-
 - Figure out how to parse OBU structures (kinda getting there)
    - Implement a bitstream reader
 - Figure out how to apply the metadata to the mdat box.
    - By reading the spec in its entirety.
    - By checking out libheif's code.
 Encoder:-
 Goals:-
 - Fast and optimized
 - Reliable and robust (doesn't shit itself and panic when things go wrong, and can handle big data)
 - Works on lots of targets (Linux, Windows, Darwin, Wasm, BSDs?)
 - Tests?
 - Get it merged into the Odin core library?
@@ -0,0 +1,491 @@
 package avif
 import "core:bytes"
 import "core:fmt"
 import "core:image"
 import "core:encoding/endian"
 import "core:io"
 import "core:strings"
 Error :: image.Error
 //Image   :: image.Image
 Options :: image.Options
 Image :: struct {
    compatible_brands: [dynamic]ISOBMFFBrand,
    major_brand:       ISOBMFFBrand,
    brand_version:     u32,
    handler_type:      HEIFTrack,
    handler_name:      string,
    primary_item_id:   u32,
 }
 //            Noticed avif compatible brands, avif, mif1, miaf, MA1A, MA1B
 //            Files containing MA1A as a compatible brand are expected to list the following brands in any order:
 //            avif, mif1, miaf, MA1A
 //            If the file contains a `pict` track compliant with this profile then it's expected to list the following brands in any order:
 //            avis, msf1, miaf, MA1A
 //            Files containing MA1B as a compatible brand is expected to list the following brands in any order:
 //            avif, mif1, miaf, MA1B
 //            If the file contains a `pict` track compliant with this profile then it's expected to list the following brands in any order:
 //            avis, msf1, miaf, MA1B
 //            If the file contains a `pict` track compliant with this profile and made only of samples marked `sync` then it's expected to list the following brands in any order:
 //            avis, avio, msf1, miaf, MA1B
 VersionAndFlags :: bit_field u32 {
    flags: u32 | 24,
    version: u16 | 8, // should be u8 but compiler fails an assertion that I couldn't reproduce
 }
 ILOCSize :: bit_field u16 {
    index_size_OR_reserved: u8 | 4,
    base_offset_size: u8 | 4,
    length_size: u8 | 4,
    offset_size: u8 | 4,
 }
 // NOTE: We order the bits in the reverse order because Odin's bit_field is LSB while the spec is MSB.
 AV1CodecConfigRecord :: bit_field u32 {
    initial_presentation_delay_minus_one_OR_reserved: u8 | 4,
    initial_presentation_delay_present:               u8 | 1,
    reserved:                                         u8 | 3,
    chroma_sample_position:                           u8 | 2,
    chroma_subsampling_y:                             u8 | 1,
    chroma_subsampling_x:                             u8 | 1,
    monochrome:                                       u8 | 1,
    twelve_bit:                                       u8 | 1,
    high_bitdepth:                                    u8 | 1,
    seq_tier_0:                                       u8 | 1,
    seq_level_idx_0:                                  u8 | 5,
    seq_profile:                                      u8 | 3,
    version:                                          u8 | 7,
    marker:                                           u8 | 1,
 }
 ISOBMFFBrand :: enum u32 {
    AVIF = 'a' << 24 | 'v' << 16 | 'i' << 8 | 'f',
    MIF1 = 'm' << 24 | 'i' << 16 | 'f' << 8 | '1',
    MIAF = 'm' << 24 | 'i' << 16 | 'a' << 8 | 'f',
    MA1A = 'M' << 24 | 'A' << 16 | '1' << 8 | 'A',
    MA1B = 'M' << 24 | 'A' << 16 | '1' << 8 | 'B',
    AVIS = 'a' << 24 | 'v' << 16 | 'i' << 8 | 's',
    AVIO = 'a' << 24 | 'v' << 16 | 'i' << 8 | 'o',
    MSF1 = 'm' << 24 | 's' << 16 | 'f' << 8 | '1',
    AV01 = 'a' << 24 | 'v' << 16 | '0' << 8 | '1',
 }
 HEIFTrack :: enum u32 {
    PICT = 'p' << 24 | 'i' << 16 | 'c' << 8 | 't', // Picture track
 }
 save_to_buffer :: proc(
    output: ^bytes.Buffer,
    img: ^Image,
    options := Options{},
    allocator := context.allocator,
 ) -> (
    err: Error,
 ) {
    // TODO:
    return nil
 }
 load_from_bytes :: proc(
    data: []byte,
    options := Options{},
    allocator := context.allocator,
 ) -> (
    img: ^Image,
    err: Error,
 ) {
    context.allocator = allocator
    img = new(Image)
    //img.which = .AVIF
    reader: Reader
    reader_init(&reader, data)
    res := read_box(img, &reader)
    for res == .None {
        res = read_box(img, &reader)
    }
    if res != .EOF {
        fmt.eprintln(res)
        return nil, .Invalid_Input_Image
    }
    return img, nil
 }
@(private)
 read_box :: proc(img: ^Image, reader: ^Reader) -> (err: io.Error) {
    if read_header(reader) == .EOF {
        return .EOF
    }
    // if the Box has a size 0 then it's the last Box, parse it and return EOF
    if reader.size == 0 {
        err = .EOF
    }
    fmt.println("box size:", reader.size)
    fmt.println("type:", reader.type)
    #partial switch reader.type {
        case .FTYP:
            read_ftyp(img, reader)
        case .META:
            read_meta(reader)
        case .HDLR:
            read_hdlr(img, reader)
        case .PITM:
            read_pitm(img, reader)
        case .ILOC:
            read_iloc(reader)
        case .IINF:
            read_iinf(reader)
        case .INFE:
            read_infe(reader)
        case .IPRP: // Just serves as a container for the boxes inside it.
        case .IPCO: // Same as IPRP
        case .ISPE:
            read_ispe(reader)
        case .PIXI:
            read_pixi(reader)
        case .AV1C:
            read_av1c(reader)
        case .COLR:
            read_colr(reader)
        case .IPMA:
            read_ipma(reader)
        case:
            // Skip unknown boxes
            skip_box(reader)
    }
    return err
 }
@(private)
 read_ipma :: proc(reader: ^Reader) {
    vaf, _ := read_bitfield(reader, VersionAndFlags)
    entry_count, _ := read_u32be(reader)
    fmt.println("association entries:", entry_count)
    for i in 0 ..< entry_count {
        item_id: u32
        if vaf.version == 0 {
            t, _ := read_u16be(reader)
            item_id = auto_cast t
        } else {
            item_id, _ = read_u32be(reader)
        }
        association_count, _ := read_byte(reader)
        fmt.println("item_id:", item_id)
        fmt.println("association_count:", association_count)
        // TODO: something something association, IDFK I DONT HAVE THE LATEST SPEC CUZ ITS PAYWALLED
        for c in 0 ..< association_count {
            if (vaf.flags & 1) == 1 {     // if LSB is 1
                // TODO: idfk
                //data: [2]u8
                //reader_read(reader, data[:])
            } else {
                data, _ := read_byte(reader)
                fmt.println(data)
            }
        }
    }
 }
@(private)
 read_colr :: proc(reader: ^Reader) {
    _color_type: [4]u8
    read_slice(reader, _color_type[:])
    color_type := string(_color_type[:])
    if color_type == "nclx" {
        color_primaries, _ := read_u16be(reader)
        transfer_characteristics, _ := read_u16be(reader)
        matrix_coefficients, _ := read_u16be(reader)
        data, _ := read_byte(reader)
        // remaining 7 bits are reserved
        full_range_flag := data >> 7
        fmt.println("color primaries:", color_primaries)
        fmt.println("transfer characteristics:", transfer_characteristics)
        fmt.println("matrix coefficients:", matrix_coefficients)
        fmt.println("full_range_flag", full_range_flag)
    } else if color_type == "rICC" {
        // TODO: restricted icc profile
        fmt.eprintln("rICC color profile is not supported yet")
    } else if color_type == "prof" {
        fmt.eprintln("prof color profile is not supported yet")
        // TODO: icc profile
    }
 }
@(private)
 read_av1c :: proc(reader: ^Reader) {
    data, _ := read_bitfield(reader, AV1CodecConfigRecord)
    fmt.println(data)
 }
@(private)
 read_pixi :: proc(reader: ^Reader) {
    vaf, _ := read_bitfield(reader, VersionAndFlags)
    channel_bits: []u8
    if vaf.version == 0 {
        channels_count, _ := read_byte(reader)
        channel_bits = make([]u8, channels_count)
        fmt.printfln("There are %d channels in this image", channels_count)
        for i in 0 ..< channels_count {
            bits_per_channel, _ := read_byte(reader)
            channel_bits[i] = bits_per_channel
        }
    }
    fmt.println(channel_bits)
 }
@(private)
 read_ispe :: proc(reader: ^Reader) {
    vaf, _ := read_bitfield(reader, VersionAndFlags)
    if vaf.version == 0 {
        width, _ := read_u32be(reader)
        height, _ := read_u32be(reader)
        fmt.println("Width:", width)
        fmt.println("Height:", height)
    } else {
        // TODO: should we error here??
        fmt.eprintln("Unknown ispe version:", vaf.version)
    }
 }
@(private)
 read_infe :: proc(reader: ^Reader) {
    vaf, _ := read_bitfield(reader, VersionAndFlags)
    item_id: u32
    item_protection_index: u16
    item_name: string
    content_type: string
    content_encoding: string
    if vaf.version == 0 || vaf.version == 1 {
        _item_id, _ := read_u16be(reader)
        item_id = auto_cast _item_id
        item_protection_index, _ = read_u16be(reader)
        item_name, _ = read_string(reader)
        content_type, _ = read_string(reader)
        content_encoding, _ = read_string(reader)
    }
    if vaf.version == 1 {
        // TODO: ?? not sure about the ItemInfoExtension class
    }
    if vaf.version >= 2 {
        // Reference: https://github.com/strukturag/libheif/blob/master/libheif/box.cc#L1567
        hidden_item: bool = (vaf.flags & 1) == 1
        if vaf.version == 2 {
            t, _ := read_u16be(reader)
            item_id = auto_cast t
        } else if vaf.version == 3 {
            item_id, _ = read_u32be(reader)
        }
        item_uri_type: string
        item_type: [4]u8
        item_protection_index, _ = read_u16be(reader)
        read_slice(reader, item_type[:])
        item_name, _ = read_string(reader)
        // This is for ISOBMFF, avif uses av01 and similar named types
        if string(item_type[:]) == "mime" {
            content_type, _ = read_string(reader)
            content_encoding, _ := read_string(reader)
        } else if string(item_type[:]) == "uri " {
            item_uri_type, _ = read_string(reader)
        } else if string(item_type[:]) == "av01" {
            // TODO: ??? idfk
        }
        fmt.println("item type", string(item_type[:]))
        fmt.println("item uri type", item_uri_type)
    }
    fmt.println("VAF:", vaf)
    fmt.println("item_id", item_id)
    fmt.println("item_protection_index", item_protection_index)
    fmt.println("item_name", item_name)
    fmt.println("content type", content_type)
    fmt.println("content encoding", content_encoding)
 }
@(private)
 read_iinf :: proc(reader: ^Reader) {
    vaf, _ := read_bitfield(reader, VersionAndFlags)
    entry_count: u32 = 0
    if vaf.version == 0 {
        t, _ := read_u16be(reader)
        entry_count = auto_cast t
    } else {
        entry_count, _ = read_u32be(reader)
    }
 }
@(private)
 read_iloc :: proc(reader: ^Reader) {
    vaf, _ := read_bitfield(reader, VersionAndFlags)
    size, _ := read_bitfield(reader, ILOCSize)
    item_count: u32
    if vaf.version < 2 {
        _item_count, _ := read_u16be(reader)
        item_count = auto_cast _item_count
    } else if vaf.version == 2 {
        item_count, _ = read_u32be(reader)
    }
    fmt.println("VAF:", vaf)
    fmt.println("Size:", size)
    fmt.println("Item count", item_count)
    for i in 0 ..< item_count {
        item_id: u32
        construction_method: u8 = 0
        if vaf.version < 2 {
            _item_id, _ := read_u16be(reader)
            item_id = auto_cast _item_id
        } else {
            item_count, _ = read_u32be(reader)
        }
        if vaf.version == 1 || vaf.version == 2 {
            data, _ := read_u16be(reader)
            // First 12 bits are reserved
            construction_method = auto_cast (data & 0xF)
        }
        data_reference_index, _ := read_u16be(reader)
        base_offset: u64 = 0
        if size.base_offset_size == 4 {
            t, _ := read_u32be(reader)
            base_offset = auto_cast t
        } else if size.base_offset_size == 8 {
            base_offset, _ = read_u64be(reader)
        }
        extent_count, _ := read_u16be(reader)
        fmt.println("item id:", item_id)
        fmt.println("construction method", construction_method)
        fmt.println("data reference index", data_reference_index)
        fmt.println("base offset", base_offset)
        fmt.println("extent count", extent_count)
        for j in 0 ..< extent_count {
            if (vaf.version == 1 || vaf.version == 2) && size.index_size_OR_reserved > 0 {
                extent_index: u64 = 0
                if size.index_size_OR_reserved == 4 {
                    t, _ := read_u32be(reader)
                    extent_index = auto_cast t
                } else if size.index_size_OR_reserved == 8 {
                    extent_index, _ = read_u64be(reader)
                }
                fmt.println("extent index", extent_index)
            }
            extent_offset: u64 = 0
            extent_length: u64 = 0
            if size.offset_size == 4 {
                t, _ := read_u32be(reader)
                extent_offset = auto_cast t
            } else if size.offset_size == 8 {
                extent_offset, _ = read_u64be(reader)
            }
            if size.length_size == 4 {
                t, _ := read_u32be(reader)
                extent_length = auto_cast t
            } else if size.length_size == 8 {
                extent_length, _ = read_u64be(reader)
            }
            fmt.println("extent offset", extent_offset)
            fmt.println("extent length", extent_length)
        }
    }
 }
@(private)
 read_pitm :: proc(img: ^Image, reader: ^Reader) {
    vaf, _ := read_bitfield(reader, VersionAndFlags)
    if vaf.version == 0 {
        item_id, _ := read_u16be(reader)
        img.primary_item_id = auto_cast item_id
    } else {
        img.primary_item_id, _ = read_u32be(reader)
    }
 }
@(private)
 read_hdlr :: proc(img: ^Image, reader: ^Reader) {
    vaf, _ := read_bitfield(reader, VersionAndFlags)
    reader_seek(reader, 4, .Current) // Field called 'Predefined'. Always 0?
    handler_type, err := read_u32be(reader)
    if err != nil {
        fmt.eprintln(err)
    }
    reader_seek(reader, 4 * 3, .Current) // array with size 3 of 4byte reserved data. [3]u32
    img.handler_type = transmute(HEIFTrack)handler_type
    img.handler_name, _ = read_string(reader)
 }
@(private)
 read_meta :: proc(reader: ^Reader) {
    vaf, _ := read_bitfield(reader, VersionAndFlags)
    fmt.println("Meta Box VAF:", vaf)
 }
@(private)
 read_ftyp :: proc(img: ^Image, reader: ^Reader) {
    major_brand, _ := read_u32be(reader)
    img.major_brand = transmute(ISOBMFFBrand)major_brand
    img.brand_version, _ = read_u32be(reader)
    num_compatible_brands := remaining_box_size(reader) / size_of(ISOBMFFBrand)
    for i in 0 ..< num_compatible_brands {
        brand, _ := read_u32be(reader)
        append(&img.compatible_brands, transmute(ISOBMFFBrand)brand)
    }
 }
@@ -0,0 +1,6 @@
 //+build js
 package avif
 save :: proc{save_to_buffer}
 load :: proc{load_from_bytes}
@@ -0,0 +1,33 @@
 //+build !js
 package avif
 import "core:os"
 import "core:bytes"
 save :: proc{save_to_file, save_to_buffer}
 save_to_file :: proc(output: string, img: ^Image, options := Options{}, allocator := context.allocator) -> (err: Error) {
 	out := &bytes.Buffer{}
 	defer bytes.buffer_destroy(out)
 	save_to_buffer(out, img, options) or_return
 	write_ok := os.write_entire_file(output, out.buf[:])
 	return nil if write_ok else .Unable_To_Write_File
 }
 load :: proc{load_from_file, load_from_bytes}
 load_from_file :: proc(filename: string, options := Options{}, allocator := context.allocator) -> (img: ^Image, err: Error) {
 	context.allocator = allocator
 	data, ok := os.read_entire_file(filename)
 	defer delete(data)
 	if ok {
 		return load_from_bytes(data, options)
 	} else {
 		return nil, .Unable_To_Read_File
 	}
 }
@@ -0,0 +1,219 @@
 package avif
 import "core:encoding/endian"
 import "core:fmt"
 import "core:io"
 import "core:strings"
 import "core:unicode/utf8"
 BOX_HEADER_SIZE :: 8 // 4 for box size, 4 for box type
 _BoxError :: enum {
    ReadExceedsBox,
 }
 BoxType :: enum u32 {
    FTYP = 'f' << 24 | 't' << 16 | 'y' << 8 | 'p', // File Type
    MDAT = 'm' << 24 | 'd' << 16 | 'a' << 8 | 't', // Media Data
    META = 'm' << 24 | 'e' << 16 | 't' << 8 | 'a', // Metadata
    HDLR = 'h' << 24 | 'd' << 16 | 'l' << 8 | 'r', // Declares Metadata Handler Type
    ILOC = 'i' << 24 | 'l' << 16 | 'o' << 8 | 'c', // Item Location
    IINF = 'i' << 24 | 'i' << 16 | 'n' << 8 | 'f', // Item Information
    INFE = 'i' << 24 | 'n' << 16 | 'f' << 8 | 'e', // Item Info Entry
    PITM = 'p' << 24 | 'i' << 16 | 't' << 8 | 'm', // Primary Item Reference
    IPRP = 'i' << 24 | 'p' << 16 | 'r' << 8 | 'p', // Item Properties
    IREF = 'i' << 24 | 'r' << 16 | 'e' << 8 | 'f', // Item Reference
    GRPL = 'g' << 24 | 'r' << 16 | 'p' << 8 | 'l', // Group List
    IPCO = 'i' << 24 | 'p' << 16 | 'c' << 8 | 'o', // Item Property Container
    ISPE = 'i' << 24 | 's' << 16 | 'p' << 8 | 'e', // Image Spatial Extents
    PIXI = 'p' << 24 | 'i' << 16 | 'x' << 8 | 'i', // Pixel Information
    COLR = 'c' << 24 | 'o' << 16 | 'l' << 8 | 'r', // Color Information
    AV1C = 'a' << 24 | 'v' << 16 | '1' << 8 | 'C', // AV1 Codec Configuration
    IPMA = 'i' << 24 | 'p' << 16 | 'm' << 8 | 'a', // Item Property Association
    CLLI = 'c' << 24 | 'l' << 16 | 'l' << 8 | 'i', // Content Light Level Info
 }
 BoxError :: union {
    io.Error,
    _BoxError,
 }
 Box :: struct {
    size: u32,
    type: BoxType,
 }
 Reader :: struct {
    using current_box: Box,
    s:                 []byte, // read-only buffer
    i:                 i64, // current reading index
    box_pos:           i64, // Byte index for the Box
 }
 reader_init :: proc(r: ^Reader, s: []byte) {
    r.s = s
    r.i = 0
    r.box_pos = 0
 }
 read_header :: proc(r: ^Reader) -> (err: BoxError) {
    r.box_pos = 0
    r.size = read_u32be(r) or_return
    type := read_u32be(r) or_return
    r.type = transmute(BoxType)type
    return err
 }
 read_byte :: proc(r: ^Reader) -> (byte, BoxError) {
    if r.i >= i64(len(r.s)) {
        return 0, .EOF
    }
    if r.box_pos >= i64(r.size) {
        return 0, .ReadExceedsBox
    }
    b := r.s[r.i]
    r.i += 1
    r.box_pos += 1
    return b, nil
 }
 read_u16be :: proc(r: ^Reader) -> (u16, BoxError) {
    if r.i >= i64(len(r.s)) {
        return 0, .EOF
    }
    if r.box_pos + 2 > i64(r.size) {
        return 0, .ReadExceedsBox
    }
    b := endian.unchecked_get_u16be(r.s[r.i:])
    r.i += 2
    r.box_pos += 2
    return b, nil
 }
 read_u32be :: proc(r: ^Reader) -> (u32, BoxError) {
    if r.i >= i64(len(r.s)) {
        return 0, .EOF
    }
    if r.size != 0 && r.box_pos + 4 > i64(r.size) {
        return 0, .ReadExceedsBox
    }
    b := endian.unchecked_get_u32be(r.s[r.i:])
    r.i += 4
    r.box_pos += 4
    return b, nil
 }
 read_u64be :: proc(r: ^Reader) -> (u64, BoxError) {
    if r.i >= i64(len(r.s)) {
        return 0, .EOF
    }
    if r.size != 0 && r.box_pos + 8 > i64(r.size) {
        return 0, .ReadExceedsBox
    }
    b := endian.unchecked_get_u64be(r.s[r.i:])
    r.i += 8
    r.box_pos += 8
    return b, nil
 }
 read_slice :: proc(r: ^Reader, s: []byte) -> (n: int, err: BoxError) {
    if r.i >= i64(len(r.s)) {
        return 0, .EOF
    }
    n = copy(s, r.s[r.i:])
    if r.box_pos + i64(n) > i64(r.size) {
        return 0, .ReadExceedsBox
    }
    r.i += i64(n)
    r.box_pos += i64(n)
    return
 }
 read_rune :: proc(r: ^Reader) -> (ch: rune, size: int, err: BoxError) {
    if r.i >= i64(len(r.s)) {
        return 0, 0, .EOF
    }
    if c := r.s[r.i]; c < utf8.RUNE_SELF {
        if r.box_pos >= i64(r.size) {
            return 0, 0, .ReadExceedsBox
        }
        r.i += 1
        r.box_pos += 1
        return rune(c), 1, nil
    }
    ch, size = utf8.decode_rune(r.s[r.i:])
    if r.box_pos + i64(size) > i64(r.size) {
        return 0, 0, .ReadExceedsBox
    }
    r.i += i64(size)
    r.box_pos += i64(size)
    return
 }
 read_string :: proc(r: ^Reader) -> (str: string, err: BoxError) {
    if r.i >= i64(len(r.s)) {
        return "", .EOF
    }
    sb: strings.Builder
    strings.builder_init_len_cap(&sb, 0, 8)
    defer strings.builder_destroy(&sb)
    for {
        rune, _ := read_rune(r) or_break
        if rune == '\x00' {
            break
        }
        strings.write_rune(&sb, rune)
    }
    return strings.clone(strings.to_string(sb)), err
 }
@(private = "file")
 read_bitfield_u32 :: proc(r: ^Reader, $T: typeid) -> (T, BoxError) where size_of(T) == 4 {
    b, err := read_u32be(r)
    return T(b), err
 }
@(private = "file")
 read_bitfield_u16 :: proc(r: ^Reader, $T: typeid) -> (T, BoxError) where size_of(T) == 2 {
    b, err := read_u16be(r)
    return T(b), err
 }
 read_bitfield :: proc {
    read_bitfield_u16,
    read_bitfield_u32,
 }
 skip_box :: proc(r: ^Reader) {
    fmt.printfln("SKIPPED! %v with size %d", r.type, r.size)
    reader_seek(r, auto_cast r.size - BOX_HEADER_SIZE, .Current)
 }
 remaining_box_size :: proc(r: ^Reader) -> i64 {
    return i64(r.size) - r.box_pos
 }
 reader_seek :: proc(r: ^Reader, offset: i64, whence: io.Seek_From) -> (i64, BoxError) {
    abs: i64
    switch whence {
        case .Start:
            abs = offset
        case .Current:
            abs = r.i + offset
        case .End:
            abs = i64(len(r.s)) + offset
        case:
            return 0, .Invalid_Whence
    }
    if abs < 0 {
        return 0, .Invalid_Offset
    }
    r.i = abs
    return abs, nil
 }
@@ -0,0 +1,20 @@
 package avif_example
 import "core:fmt"
 import "core:os"
 import avif "../"
 main :: proc() {
    if len(os.args) < 2 {
        fmt.eprintln("Please provide a path to an avif image.")
        os.exit(1)
    }
    img, err := avif.load_from_file(os.args[1])
    if err != nil {
        fmt.eprintln(err)
        os.exit(1)
    }
    fmt.println(img)
 }
@@ -0,0 +1,70 @@
 package avif
 import "core:io"
 OBUType :: enum u8 {
    SEQUENCE_HEADER        = 1,
    TEMPORAL_DELIMITER     = 2,
    FRAME_HEADER           = 3,
    TILE_GROUP             = 4,
    METADATA               = 5,
    FRAME                  = 6,
    REDUNDANT_FRAME_HEADER = 7,
    TILE_LIST              = 8,
    PADDING                = 15,
 }
 // TODO: write a nice bitstream reader
 // ??? Still don't know how I want this to work
 BitstreamReader :: struct {
    data: []byte,
    pos: i64, // Number of bits read from the data slice
 }
 OBUHeader :: bit_field u8 {
    obu_reserved:       u8      | 1,
    obu_has_size_field: u8      | 1,
    obu_extension_flag: u8      | 1,
    obu_type:           OBUType | 4,
    obu_forbidden_bit:  u8      | 1,
 }
 OBUExtensionHeader :: bit_field u8 {
    extension_header_reserved: u8 | 3,
    spatial_id:                u8 | 2,
    temporal_id:               u8 | 3,
 }
 read_bit :: proc() -> b8 {
    // TODO: idfk
    // This should read a single bit from the bitstream and advance the bitstream position by 1
    return false
 }
 f :: proc(n: int) -> u64 {
    x: u64 = 0
    for i in 0 ..< n {
        x = 2 * x + auto_cast read_bit()
    }
    return x
 }
 leb128 :: proc() -> u64 {
    value: u64 = 0
    leb128_bytes := 0
    for i: u64 = 0; i < 8; i += 1 {
        leb128_byte := f(8)
        value |= ((leb128_byte & 0x7f) << (i * 7))
        leb128_bytes += 1
        if (leb128_byte & 0x80) == 0 {
            break
        }
    }
    return value
 }