Deleted vendor folder

1 files changed, 0 insertions, 783 deletions

diff --git a/vendor/image/src/codecs/webp/lossless.rs b/vendor/image/src/codecs/webp/lossless.rs
deleted file mode 100644
index 7271eda..0000000
--- a/vendor/image/src/codecs/webp/lossless.rs
+++ /dev/null
@@ -1,783 +0,0 @@
-//! Decoding of lossless WebP images
-//!
-//! [Lossless spec](https://developers.google.com/speed/webp/docs/webp_lossless_bitstream_specification)
-//!
-
-use std::{
-    convert::TryFrom,
-    convert::TryInto,
-    error, fmt,
-    io::Read,
-    ops::{AddAssign, Shl},
-};
-
-use byteorder::ReadBytesExt;
-
-use crate::{error::DecodingError, ImageError, ImageFormat, ImageResult};
-
-use super::huffman::HuffmanTree;
-use super::lossless_transform::{add_pixels, TransformType};
-
-const CODE_LENGTH_CODES: usize = 19;
-const CODE_LENGTH_CODE_ORDER: [usize; CODE_LENGTH_CODES] = [
-    17, 18, 0, 1, 2, 3, 4, 5, 16, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
-];
-
-#[rustfmt::skip]
-const DISTANCE_MAP: [(i8, i8); 120] = [
-    (0, 1),  (1, 0),  (1, 1),  (-1, 1), (0, 2),  (2, 0),  (1, 2),  (-1, 2),
-    (2, 1),  (-2, 1), (2, 2),  (-2, 2), (0, 3),  (3, 0),  (1, 3),  (-1, 3),
-    (3, 1),  (-3, 1), (2, 3),  (-2, 3), (3, 2),  (-3, 2), (0, 4),  (4, 0),
-    (1, 4),  (-1, 4), (4, 1),  (-4, 1), (3, 3),  (-3, 3), (2, 4),  (-2, 4),
-    (4, 2),  (-4, 2), (0, 5),  (3, 4),  (-3, 4), (4, 3),  (-4, 3), (5, 0),
-    (1, 5),  (-1, 5), (5, 1),  (-5, 1), (2, 5),  (-2, 5), (5, 2),  (-5, 2),
-    (4, 4),  (-4, 4), (3, 5),  (-3, 5), (5, 3),  (-5, 3), (0, 6),  (6, 0),
-    (1, 6),  (-1, 6), (6, 1),  (-6, 1), (2, 6),  (-2, 6), (6, 2),  (-6, 2),
-    (4, 5),  (-4, 5), (5, 4),  (-5, 4), (3, 6),  (-3, 6), (6, 3),  (-6, 3),
-    (0, 7),  (7, 0),  (1, 7),  (-1, 7), (5, 5),  (-5, 5), (7, 1),  (-7, 1),
-    (4, 6),  (-4, 6), (6, 4),  (-6, 4), (2, 7),  (-2, 7), (7, 2),  (-7, 2),
-    (3, 7),  (-3, 7), (7, 3),  (-7, 3), (5, 6),  (-5, 6), (6, 5),  (-6, 5),
-    (8, 0),  (4, 7),  (-4, 7), (7, 4),  (-7, 4), (8, 1),  (8, 2),  (6, 6),
-    (-6, 6), (8, 3),  (5, 7),  (-5, 7), (7, 5),  (-7, 5), (8, 4),  (6, 7),
-    (-6, 7), (7, 6),  (-7, 6), (8, 5),  (7, 7),  (-7, 7), (8, 6),  (8, 7)
-];
-
-const GREEN: usize = 0;
-const RED: usize = 1;
-const BLUE: usize = 2;
-const ALPHA: usize = 3;
-const DIST: usize = 4;
-
-const HUFFMAN_CODES_PER_META_CODE: usize = 5;
-
-type HuffmanCodeGroup = [HuffmanTree; HUFFMAN_CODES_PER_META_CODE];
-
-const ALPHABET_SIZE: [u16; HUFFMAN_CODES_PER_META_CODE] = [256 + 24, 256, 256, 256, 40];
-
-#[inline]
-pub(crate) fn subsample_size(size: u16, bits: u8) -> u16 {
-    ((u32::from(size) + (1u32 << bits) - 1) >> bits)
-        .try_into()
-        .unwrap()
-}
-
-#[derive(Debug, Clone, Copy)]
-pub(crate) enum DecoderError {
-    /// Signature of 0x2f not found
-    LosslessSignatureInvalid(u8),
-    /// Version Number must be 0
-    VersionNumberInvalid(u8),
-
-    ///
-    InvalidColorCacheBits(u8),
-
-    HuffmanError,
-
-    BitStreamError,
-
-    TransformError,
-}
-
-impl fmt::Display for DecoderError {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self {
-            DecoderError::LosslessSignatureInvalid(sig) => {
-                f.write_fmt(format_args!("Invalid lossless signature: {}", sig))
-            }
-            DecoderError::VersionNumberInvalid(num) => {
-                f.write_fmt(format_args!("Invalid version number: {}", num))
-            }
-            DecoderError::InvalidColorCacheBits(num) => f.write_fmt(format_args!(
-                "Invalid color cache(must be between 1-11): {}",
-                num
-            )),
-            DecoderError::HuffmanError => f.write_fmt(format_args!("Error building Huffman Tree")),
-            DecoderError::BitStreamError => {
-                f.write_fmt(format_args!("Error while reading bitstream"))
-            }
-            DecoderError::TransformError => {
-                f.write_fmt(format_args!("Error while reading or writing transforms"))
-            }
-        }
-    }
-}
-
-impl From<DecoderError> for ImageError {
-    fn from(e: DecoderError) -> ImageError {
-        ImageError::Decoding(DecodingError::new(ImageFormat::WebP.into(), e))
-    }
-}
-
-impl error::Error for DecoderError {}
-
-const NUM_TRANSFORM_TYPES: usize = 4;
-
-//Decodes lossless WebP images
-#[derive(Debug)]
-pub(crate) struct LosslessDecoder<R> {
-    r: R,
-    bit_reader: BitReader,
-    frame: LosslessFrame,
-    transforms: [Option<TransformType>; NUM_TRANSFORM_TYPES],
-    transform_order: Vec<u8>,
-}
-
-impl<R: Read> LosslessDecoder<R> {
-    /// Create a new decoder
-    pub(crate) fn new(r: R) -> LosslessDecoder<R> {
-        LosslessDecoder {
-            r,
-            bit_reader: BitReader::new(),
-            frame: Default::default(),
-            transforms: [None, None, None, None],
-            transform_order: Vec::new(),
-        }
-    }
-
-    /// Reads the frame
-    pub(crate) fn decode_frame(&mut self) -> ImageResult<&LosslessFrame> {
-        let signature = self.r.read_u8()?;
-
-        if signature != 0x2f {
-            return Err(DecoderError::LosslessSignatureInvalid(signature).into());
-        }
-
-        let mut buf = Vec::new();
-        self.r.read_to_end(&mut buf)?;
-        self.bit_reader.init(buf);
-
-        self.frame.width = self.bit_reader.read_bits::<u16>(14)? + 1;
-        self.frame.height = self.bit_reader.read_bits::<u16>(14)? + 1;
-
-        let _alpha_used = self.bit_reader.read_bits::<u8>(1)?;
-
-        let version_num = self.bit_reader.read_bits::<u8>(3)?;
-
-        if version_num != 0 {
-            return Err(DecoderError::VersionNumberInvalid(version_num).into());
-        }
-
-        let mut data = self.decode_image_stream(self.frame.width, self.frame.height, true)?;
-
-        for &trans_index in self.transform_order.iter().rev() {
-            let trans = self.transforms[usize::from(trans_index)].as_ref().unwrap();
-            trans.apply_transform(&mut data, self.frame.width, self.frame.height)?;
-        }
-
-        self.frame.buf = data;
-        Ok(&self.frame)
-    }
-
-    //used for alpha data in extended decoding
-    pub(crate) fn decode_frame_implicit_dims(
-        &mut self,
-        width: u16,
-        height: u16,
-    ) -> ImageResult<&LosslessFrame> {
-        let mut buf = Vec::new();
-        self.r.read_to_end(&mut buf)?;
-        self.bit_reader.init(buf);
-
-        self.frame.width = width;
-        self.frame.height = height;
-
-        let mut data = self.decode_image_stream(self.frame.width, self.frame.height, true)?;
-
-        //transform_order is vector of indices(0-3) into transforms in order decoded
-        for &trans_index in self.transform_order.iter().rev() {
-            let trans = self.transforms[usize::from(trans_index)].as_ref().unwrap();
-            trans.apply_transform(&mut data, self.frame.width, self.frame.height)?;
-        }
-
-        self.frame.buf = data;
-        Ok(&self.frame)
-    }
-
-    /// Reads Image data from the bitstream
-    /// Can be in any of the 5 roles described in the Specification
-    /// ARGB Image role has different behaviour to the other 4
-    /// xsize and ysize describe the size of the blocks where each block has its own entropy code
-    fn decode_image_stream(
-        &mut self,
-        xsize: u16,
-        ysize: u16,
-        is_argb_img: bool,
-    ) -> ImageResult<Vec<u32>> {
-        let trans_xsize = if is_argb_img {
-            self.read_transforms()?
-        } else {
-            xsize
-        };
-
-        let color_cache_bits = self.read_color_cache()?;
-
-        let color_cache = color_cache_bits.map(|bits| {
-            let size = 1 << bits;
-            let cache = vec![0u32; size];
-            ColorCache {
-                color_cache_bits: bits,
-                color_cache: cache,
-            }
-        });
-
-        let huffman_info = self.read_huffman_codes(is_argb_img, trans_xsize, ysize, color_cache)?;
-
-        //decode data
-        let data = self.decode_image_data(trans_xsize, ysize, huffman_info)?;
-
-        Ok(data)
-    }
-
-    /// Reads transforms and their data from the bitstream
-    fn read_transforms(&mut self) -> ImageResult<u16> {
-        let mut xsize = self.frame.width;
-
-        while self.bit_reader.read_bits::<u8>(1)? == 1 {
-            let transform_type_val = self.bit_reader.read_bits::<u8>(2)?;
-
-            if self.transforms[usize::from(transform_type_val)].is_some() {
-                //can only have one of each transform, error
-                return Err(DecoderError::TransformError.into());
-            }
-
-            self.transform_order.push(transform_type_val);
-
-            let transform_type = match transform_type_val {
-                0 => {
-                    //predictor
-
-                    let size_bits = self.bit_reader.read_bits::<u8>(3)? + 2;
-
-                    let block_xsize = subsample_size(xsize, size_bits);
-                    let block_ysize = subsample_size(self.frame.height, size_bits);
-
-                    let data = self.decode_image_stream(block_xsize, block_ysize, false)?;
-
-                    TransformType::PredictorTransform {
-                        size_bits,
-                        predictor_data: data,
-                    }
-                }
-                1 => {
-                    //color transform
-
-                    let size_bits = self.bit_reader.read_bits::<u8>(3)? + 2;
-
-                    let block_xsize = subsample_size(xsize, size_bits);
-                    let block_ysize = subsample_size(self.frame.height, size_bits);
-
-                    let data = self.decode_image_stream(block_xsize, block_ysize, false)?;
-
-                    TransformType::ColorTransform {
-                        size_bits,
-                        transform_data: data,
-                    }
-                }
-                2 => {
-                    //subtract green
-
-                    TransformType::SubtractGreen
-                }
-                3 => {
-                    let color_table_size = self.bit_reader.read_bits::<u16>(8)? + 1;
-
-                    let mut color_map = self.decode_image_stream(color_table_size, 1, false)?;
-
-                    let bits = if color_table_size <= 2 {
-                        3
-                    } else if color_table_size <= 4 {
-                        2
-                    } else if color_table_size <= 16 {
-                        1
-                    } else {
-                        0
-                    };
-                    xsize = subsample_size(xsize, bits);
-
-                    Self::adjust_color_map(&mut color_map);
-
-                    TransformType::ColorIndexingTransform {
-                        table_size: color_table_size,
-                        table_data: color_map,
-                    }
-                }
-                _ => unreachable!(),
-            };
-
-            self.transforms[usize::from(transform_type_val)] = Some(transform_type);
-        }
-
-        Ok(xsize)
-    }
-
-    /// Adjusts the color map since it's subtraction coded
-    fn adjust_color_map(color_map: &mut Vec<u32>) {
-        for i in 1..color_map.len() {
-            color_map[i] = add_pixels(color_map[i], color_map[i - 1]);
-        }
-    }
-
-    /// Reads huffman codes associated with an image
-    fn read_huffman_codes(
-        &mut self,
-        read_meta: bool,
-        xsize: u16,
-        ysize: u16,
-        color_cache: Option<ColorCache>,
-    ) -> ImageResult<HuffmanInfo> {
-        let mut num_huff_groups = 1;
-
-        let mut huffman_bits = 0;
-        let mut huffman_xsize = 1;
-        let mut huffman_ysize = 1;
-        let mut entropy_image = Vec::new();
-
-        if read_meta && self.bit_reader.read_bits::<u8>(1)? == 1 {
-            //meta huffman codes
-            huffman_bits = self.bit_reader.read_bits::<u8>(3)? + 2;
-            huffman_xsize = subsample_size(xsize, huffman_bits);
-            huffman_ysize = subsample_size(ysize, huffman_bits);
-
-            entropy_image = self.decode_image_stream(huffman_xsize, huffman_ysize, false)?;
-
-            for pixel in entropy_image.iter_mut() {
-                let meta_huff_code = (*pixel >> 8) & 0xffff;
-
-                *pixel = meta_huff_code;
-
-                if meta_huff_code >= num_huff_groups {
-                    num_huff_groups = meta_huff_code + 1;
-                }
-            }
-        }
-
-        let mut hufftree_groups = Vec::new();
-
-        for _i in 0..num_huff_groups {
-            let mut group: HuffmanCodeGroup = Default::default();
-            for j in 0..HUFFMAN_CODES_PER_META_CODE {
-                let mut alphabet_size = ALPHABET_SIZE[j];
-                if j == 0 {
-                    if let Some(color_cache) = color_cache.as_ref() {
-                        alphabet_size += 1 << color_cache.color_cache_bits;
-                    }
-                }
-
-                let tree = self.read_huffman_code(alphabet_size)?;
-                group[j] = tree;
-            }
-            hufftree_groups.push(group);
-        }
-
-        let huffman_mask = if huffman_bits == 0 {
-            !0
-        } else {
-            (1 << huffman_bits) - 1
-        };
-
-        let info = HuffmanInfo {
-            xsize: huffman_xsize,
-            _ysize: huffman_ysize,
-            color_cache,
-            image: entropy_image,
-            bits: huffman_bits,
-            mask: huffman_mask,
-            huffman_code_groups: hufftree_groups,
-        };
-
-        Ok(info)
-    }
-
-    /// Decodes and returns a single huffman tree
-    fn read_huffman_code(&mut self, alphabet_size: u16) -> ImageResult<HuffmanTree> {
-        let simple = self.bit_reader.read_bits::<u8>(1)? == 1;
-
-        if simple {
-            let num_symbols = self.bit_reader.read_bits::<u8>(1)? + 1;
-
-            let mut code_lengths = vec![u16::from(num_symbols - 1)];
-            let mut codes = vec![0];
-            let mut symbols = Vec::new();
-
-            let is_first_8bits = self.bit_reader.read_bits::<u8>(1)?;
-            symbols.push(self.bit_reader.read_bits::<u16>(1 + 7 * is_first_8bits)?);
-
-            if num_symbols == 2 {
-                symbols.push(self.bit_reader.read_bits::<u16>(8)?);
-                code_lengths.push(1);
-                codes.push(1);
-            }
-
-            HuffmanTree::build_explicit(code_lengths, codes, symbols)
-        } else {
-            let mut code_length_code_lengths = vec![0; CODE_LENGTH_CODES];
-
-            let num_code_lengths = 4 + self.bit_reader.read_bits::<usize>(4)?;
-            for i in 0..num_code_lengths {
-                code_length_code_lengths[CODE_LENGTH_CODE_ORDER[i]] =
-                    self.bit_reader.read_bits(3)?;
-            }
-
-            let new_code_lengths =
-                self.read_huffman_code_lengths(code_length_code_lengths, alphabet_size)?;
-
-            HuffmanTree::build_implicit(new_code_lengths)
-        }
-    }
-
-    /// Reads huffman code lengths
-    fn read_huffman_code_lengths(
-        &mut self,
-        code_length_code_lengths: Vec<u16>,
-        num_symbols: u16,
-    ) -> ImageResult<Vec<u16>> {
-        let table = HuffmanTree::build_implicit(code_length_code_lengths)?;
-
-        let mut max_symbol = if self.bit_reader.read_bits::<u8>(1)? == 1 {
-            let length_nbits = 2 + 2 * self.bit_reader.read_bits::<u8>(3)?;
-            2 + self.bit_reader.read_bits::<u16>(length_nbits)?
-        } else {
-            num_symbols
-        };
-
-        let mut code_lengths = vec![0; usize::from(num_symbols)];
-        let mut prev_code_len = 8; //default code length
-
-        let mut symbol = 0;
-        while symbol < num_symbols {
-            if max_symbol == 0 {
-                break;
-            }
-            max_symbol -= 1;
-
-            let code_len = table.read_symbol(&mut self.bit_reader)?;
-
-            if code_len < 16 {
-                code_lengths[usize::from(symbol)] = code_len;
-                symbol += 1;
-                if code_len != 0 {
-                    prev_code_len = code_len;
-                }
-            } else {
-                let use_prev = code_len == 16;
-                let slot = code_len - 16;
-                let extra_bits = match slot {
-                    0 => 2,
-                    1 => 3,
-                    2 => 7,
-                    _ => return Err(DecoderError::BitStreamError.into()),
-                };
-                let repeat_offset = match slot {
-                    0 | 1 => 3,
-                    2 => 11,
-                    _ => return Err(DecoderError::BitStreamError.into()),
-                };
-
-                let mut repeat = self.bit_reader.read_bits::<u16>(extra_bits)? + repeat_offset;
-
-                if symbol + repeat > num_symbols {
-                    return Err(DecoderError::BitStreamError.into());
-                } else {
-                    let length = if use_prev { prev_code_len } else { 0 };
-                    while repeat > 0 {
-                        repeat -= 1;
-                        code_lengths[usize::from(symbol)] = length;
-                        symbol += 1;
-                    }
-                }
-            }
-        }
-
-        Ok(code_lengths)
-    }
-
-    /// Decodes the image data using the huffman trees and either of the 3 methods of decoding
-    fn decode_image_data(
-        &mut self,
-        width: u16,
-        height: u16,
-        mut huffman_info: HuffmanInfo,
-    ) -> ImageResult<Vec<u32>> {
-        let num_values = usize::from(width) * usize::from(height);
-        let mut data = vec![0; num_values];
-
-        let huff_index = huffman_info.get_huff_index(0, 0);
-        let mut tree = &huffman_info.huffman_code_groups[huff_index];
-        let mut last_cached = 0;
-        let mut index = 0;
-        let mut x = 0;
-        let mut y = 0;
-        while index < num_values {
-            if (x & huffman_info.mask) == 0 {
-                let index = huffman_info.get_huff_index(x, y);
-                tree = &huffman_info.huffman_code_groups[index];
-            }
-
-            let code = tree[GREEN].read_symbol(&mut self.bit_reader)?;
-
-            //check code
-            if code < 256 {
-                //literal, so just use huffman codes and read as argb
-                let red = tree[RED].read_symbol(&mut self.bit_reader)?;
-                let blue = tree[BLUE].read_symbol(&mut self.bit_reader)?;
-                let alpha = tree[ALPHA].read_symbol(&mut self.bit_reader)?;
-
-                data[index] = (u32::from(alpha) << 24)
-                    + (u32::from(red) << 16)
-                    + (u32::from(code) << 8)
-                    + u32::from(blue);
-
-                index += 1;
-                x += 1;
-                if x >= width {
-                    x = 0;
-                    y += 1;
-                }
-            } else if code < 256 + 24 {
-                //backward reference, so go back and use that to add image data
-                let length_symbol = code - 256;
-                let length = Self::get_copy_distance(&mut self.bit_reader, length_symbol)?;
-
-                let dist_symbol = tree[DIST].read_symbol(&mut self.bit_reader)?;
-                let dist_code = Self::get_copy_distance(&mut self.bit_reader, dist_symbol)?;
-                let dist = Self::plane_code_to_distance(width, dist_code);
-
-                if index < dist || num_values - index < length {
-                    return Err(DecoderError::BitStreamError.into());
-                }
-
-                for i in 0..length {
-                    data[index + i] = data[index + i - dist];
-                }
-                index += length;
-                x += u16::try_from(length).unwrap();
-                while x >= width {
-                    x -= width;
-                    y += 1;
-                }
-                if index < num_values {
-                    let index = huffman_info.get_huff_index(x, y);
-                    tree = &huffman_info.huffman_code_groups[index];
-                }
-            } else {
-                //color cache, so use previously stored pixels to get this pixel
-                let key = code - 256 - 24;
-
-                if let Some(color_cache) = huffman_info.color_cache.as_mut() {
-                    //cache old colors
-                    while last_cached < index {
-                        color_cache.insert(data[last_cached]);
-                        last_cached += 1;
-                    }
-                    data[index] = color_cache.lookup(key.into())?;
-                } else {
-                    return Err(DecoderError::BitStreamError.into());
-                }
-                index += 1;
-                x += 1;
-                if x >= width {
-                    x = 0;
-                    y += 1;
-                }
-            }
-        }
-
-        Ok(data)
-    }
-
-    /// Reads color cache data from the bitstream
-    fn read_color_cache(&mut self) -> ImageResult<Option<u8>> {
-        if self.bit_reader.read_bits::<u8>(1)? == 1 {
-            let code_bits = self.bit_reader.read_bits::<u8>(4)?;
-
-            if !(1..=11).contains(&code_bits) {
-                return Err(DecoderError::InvalidColorCacheBits(code_bits).into());
-            }
-
-            Ok(Some(code_bits))
-        } else {
-            Ok(None)
-        }
-    }
-
-    /// Gets the copy distance from the prefix code and bitstream
-    fn get_copy_distance(bit_reader: &mut BitReader, prefix_code: u16) -> ImageResult<usize> {
-        if prefix_code < 4 {
-            return Ok(usize::from(prefix_code + 1));
-        }
-        let extra_bits: u8 = ((prefix_code - 2) >> 1).try_into().unwrap();
-        let offset = (2 + (usize::from(prefix_code) & 1)) << extra_bits;
-
-        Ok(offset + bit_reader.read_bits::<usize>(extra_bits)? + 1)
-    }
-
-    /// Gets distance to pixel
-    fn plane_code_to_distance(xsize: u16, plane_code: usize) -> usize {
-        if plane_code > 120 {
-            plane_code - 120
-        } else {
-            let (xoffset, yoffset) = DISTANCE_MAP[plane_code - 1];
-
-            let dist = i32::from(xoffset) + i32::from(yoffset) * i32::from(xsize);
-            if dist < 1 {
-                return 1;
-            }
-            dist.try_into().unwrap()
-        }
-    }
-}
-
-#[derive(Debug, Clone)]
-struct HuffmanInfo {
-    xsize: u16,
-    _ysize: u16,
-    color_cache: Option<ColorCache>,
-    image: Vec<u32>,
-    bits: u8,
-    mask: u16,
-    huffman_code_groups: Vec<HuffmanCodeGroup>,
-}
-
-impl HuffmanInfo {
-    fn get_huff_index(&self, x: u16, y: u16) -> usize {
-        if self.bits == 0 {
-            return 0;
-        }
-        let position = usize::from((y >> self.bits) * self.xsize + (x >> self.bits));
-        let meta_huff_code: usize = self.image[position].try_into().unwrap();
-        meta_huff_code
-    }
-}
-
-#[derive(Debug, Clone)]
-struct ColorCache {
-    color_cache_bits: u8,
-    color_cache: Vec<u32>,
-}
-
-impl ColorCache {
-    fn insert(&mut self, color: u32) {
-        let index = (0x1e35a7bdu32.overflowing_mul(color).0) >> (32 - self.color_cache_bits);
-        self.color_cache[index as usize] = color;
-    }
-
-    fn lookup(&self, index: usize) -> ImageResult<u32> {
-        match self.color_cache.get(index) {
-            Some(&value) => Ok(value),
-            None => Err(DecoderError::BitStreamError.into()),
-        }
-    }
-}
-
-#[derive(Debug, Clone)]
-pub(crate) struct BitReader {
-    buf: Vec<u8>,
-    index: usize,
-    bit_count: u8,
-}
-
-impl BitReader {
-    fn new() -> BitReader {
-        BitReader {
-            buf: Vec::new(),
-            index: 0,
-            bit_count: 0,
-        }
-    }
-
-    fn init(&mut self, buf: Vec<u8>) {
-        self.buf = buf;
-    }
-
-    pub(crate) fn read_bits<T>(&mut self, num: u8) -> ImageResult<T>
-    where
-        T: num_traits::Unsigned + Shl<u8, Output = T> + AddAssign<T> + From<bool>,
-    {
-        let mut value: T = T::zero();
-
-        for i in 0..num {
-            if self.buf.len() <= self.index {
-                return Err(DecoderError::BitStreamError.into());
-            }
-            let bit_true = self.buf[self.index] & (1 << self.bit_count) != 0;
-            value += T::from(bit_true) << i;
-            self.bit_count = if self.bit_count == 7 {
-                self.index += 1;
-                0
-            } else {
-                self.bit_count + 1
-            };
-        }
-
-        Ok(value)
-    }
-}
-
-#[derive(Debug, Clone, Default)]
-pub(crate) struct LosslessFrame {
-    pub(crate) width: u16,
-    pub(crate) height: u16,
-
-    pub(crate) buf: Vec<u32>,
-}
-
-impl LosslessFrame {
-    /// Fills a buffer by converting from argb to rgba
-    pub(crate) fn fill_rgba(&self, buf: &mut [u8]) {
-        for (&argb_val, chunk) in self.buf.iter().zip(buf.chunks_exact_mut(4)) {
-            chunk[0] = ((argb_val >> 16) & 0xff).try_into().unwrap();
-            chunk[1] = ((argb_val >> 8) & 0xff).try_into().unwrap();
-            chunk[2] = (argb_val & 0xff).try_into().unwrap();
-            chunk[3] = ((argb_val >> 24) & 0xff).try_into().unwrap();
-        }
-    }
-
-    /// Get buffer size from the image
-    pub(crate) fn get_buf_size(&self) -> usize {
-        usize::from(self.width) * usize::from(self.height) * 4
-    }
-
-    /// Fills a buffer with just the green values from the lossless decoding
-    /// Used in extended alpha decoding
-    pub(crate) fn fill_green(&self, buf: &mut [u8]) {
-        for (&argb_val, buf_value) in self.buf.iter().zip(buf.iter_mut()) {
-            *buf_value = ((argb_val >> 8) & 0xff).try_into().unwrap();
-        }
-    }
-}
-
-#[cfg(test)]
-mod test {
-
-    use super::BitReader;
-
-    #[test]
-    fn bit_read_test() {
-        let mut bit_reader = BitReader::new();
-
-        //10011100 01000001 11100001
-        let buf = vec![0x9C, 0x41, 0xE1];
-
-        bit_reader.init(buf);
-
-        assert_eq!(bit_reader.read_bits::<u8>(3).unwrap(), 4); //100
-        assert_eq!(bit_reader.read_bits::<u8>(2).unwrap(), 3); //11
-        assert_eq!(bit_reader.read_bits::<u8>(6).unwrap(), 12); //001100
-        assert_eq!(bit_reader.read_bits::<u16>(10).unwrap(), 40); //0000101000
-        assert_eq!(bit_reader.read_bits::<u8>(3).unwrap(), 7); //111
-    }
-
-    #[test]
-    fn bit_read_error_test() {
-        let mut bit_reader = BitReader::new();
-
-        //01101010
-        let buf = vec![0x6A];
-
-        bit_reader.init(buf);
-
-        assert_eq!(bit_reader.read_bits::<u8>(3).unwrap(), 2); //010
-        assert_eq!(bit_reader.read_bits::<u8>(5).unwrap(), 13); //01101
-        assert!(bit_reader.read_bits::<u8>(4).is_err()); //error
-    }
-}