Initial vendor packages

Signed-off-by: Valentin Popov <valentin@popov.link>

3 files changed, 678 insertions, 0 deletions

diff --git a/vendor/image/src/codecs/ico/decoder.rs b/vendor/image/src/codecs/ico/decoder.rs
new file mode 100644
index 0000000..4f02787
--- /dev/null
+++ b/vendor/image/src/codecs/ico/decoder.rs
@@ -0,0 +1,470 @@
+use byteorder::{LittleEndian, ReadBytesExt};
+use std::convert::TryFrom;
+use std::io::{self, Cursor, Read, Seek, SeekFrom};
+use std::marker::PhantomData;
+use std::{error, fmt, mem};
+
+use crate::color::ColorType;
+use crate::error::{
+    DecodingError, ImageError, ImageResult, UnsupportedError, UnsupportedErrorKind,
+};
+use crate::image::{self, ImageDecoder, ImageFormat};
+
+use self::InnerDecoder::*;
+use crate::codecs::bmp::BmpDecoder;
+use crate::codecs::png::{PngDecoder, PNG_SIGNATURE};
+
+/// Errors that can occur during decoding and parsing an ICO image or one of its enclosed images.
+#[derive(Debug, Copy, Clone, Hash, PartialEq, Eq, PartialOrd, Ord)]
+enum DecoderError {
+    /// The ICO directory is empty
+    NoEntries,
+    /// The number of color planes (0 or 1), or the horizontal coordinate of the hotspot for CUR files too big.
+    IcoEntryTooManyPlanesOrHotspot,
+    /// The bit depth (may be 0 meaning unspecified), or the vertical coordinate of the hotspot for CUR files too big.
+    IcoEntryTooManyBitsPerPixelOrHotspot,
+
+    /// The entry is in PNG format and specified a length that is shorter than PNG header.
+    PngShorterThanHeader,
+    /// The enclosed PNG is not in RGBA, which is invalid: https://blogs.msdn.microsoft.com/oldnewthing/20101022-00/?p=12473/.
+    PngNotRgba,
+
+    /// The entry is in BMP format and specified a data size that is not correct for the image and optional mask data.
+    InvalidDataSize,
+
+    /// The dimensions specified by the entry does not match the dimensions in the header of the enclosed image.
+    ImageEntryDimensionMismatch {
+        /// The mismatched subimage's type
+        format: IcoEntryImageFormat,
+        /// The dimensions specified by the entry
+        entry: (u16, u16),
+        /// The dimensions of the image itself
+        image: (u32, u32),
+    },
+}
+
+impl fmt::Display for DecoderError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            DecoderError::NoEntries => f.write_str("ICO directory contains no image"),
+            DecoderError::IcoEntryTooManyPlanesOrHotspot => {
+                f.write_str("ICO image entry has too many color planes or too large hotspot value")
+            }
+            DecoderError::IcoEntryTooManyBitsPerPixelOrHotspot => f.write_str(
+                "ICO image entry has too many bits per pixel or too large hotspot value",
+            ),
+            DecoderError::PngShorterThanHeader => {
+                f.write_str("Entry specified a length that is shorter than PNG header!")
+            }
+            DecoderError::PngNotRgba => f.write_str("The PNG is not in RGBA format!"),
+            DecoderError::InvalidDataSize => {
+                f.write_str("ICO image data size did not match expected size")
+            }
+            DecoderError::ImageEntryDimensionMismatch {
+                format,
+                entry,
+                image,
+            } => f.write_fmt(format_args!(
+                "Entry{:?} and {}{:?} dimensions do not match!",
+                entry, format, image
+            )),
+        }
+    }
+}
+
+impl From<DecoderError> for ImageError {
+    fn from(e: DecoderError) -> ImageError {
+        ImageError::Decoding(DecodingError::new(ImageFormat::Ico.into(), e))
+    }
+}
+
+impl error::Error for DecoderError {}
+
+/// The image formats an ICO may contain
+#[derive(Debug, Copy, Clone, Hash, PartialEq, Eq, PartialOrd, Ord)]
+enum IcoEntryImageFormat {
+    /// PNG in ARGB
+    Png,
+    /// BMP with optional alpha mask
+    Bmp,
+}
+
+impl fmt::Display for IcoEntryImageFormat {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.write_str(match self {
+            IcoEntryImageFormat::Png => "PNG",
+            IcoEntryImageFormat::Bmp => "BMP",
+        })
+    }
+}
+
+impl From<IcoEntryImageFormat> for ImageFormat {
+    fn from(val: IcoEntryImageFormat) -> Self {
+        match val {
+            IcoEntryImageFormat::Png => ImageFormat::Png,
+            IcoEntryImageFormat::Bmp => ImageFormat::Bmp,
+        }
+    }
+}
+
+/// An ico decoder
+pub struct IcoDecoder<R: Read> {
+    selected_entry: DirEntry,
+    inner_decoder: InnerDecoder<R>,
+}
+
+enum InnerDecoder<R: Read> {
+    Bmp(BmpDecoder<R>),
+    Png(Box<PngDecoder<R>>),
+}
+
+#[derive(Clone, Copy, Default)]
+struct DirEntry {
+    width: u8,
+    height: u8,
+    // We ignore some header fields as they will be replicated in the PNG, BMP and they are not
+    // necessary for determining the best_entry.
+    #[allow(unused)]
+    color_count: u8,
+    // Wikipedia has this to say:
+    // Although Microsoft's technical documentation states that this value must be zero, the icon
+    // encoder built into .NET (System.Drawing.Icon.Save) sets this value to 255. It appears that
+    // the operating system ignores this value altogether.
+    #[allow(unused)]
+    reserved: u8,
+
+    // We ignore some header fields as they will be replicated in the PNG, BMP and they are not
+    // necessary for determining the best_entry.
+    #[allow(unused)]
+    num_color_planes: u16,
+    bits_per_pixel: u16,
+
+    image_length: u32,
+    image_offset: u32,
+}
+
+impl<R: Read + Seek> IcoDecoder<R> {
+    /// Create a new decoder that decodes from the stream ```r```
+    pub fn new(mut r: R) -> ImageResult<IcoDecoder<R>> {
+        let entries = read_entries(&mut r)?;
+        let entry = best_entry(entries)?;
+        let decoder = entry.decoder(r)?;
+
+        Ok(IcoDecoder {
+            selected_entry: entry,
+            inner_decoder: decoder,
+        })
+    }
+}
+
+fn read_entries<R: Read>(r: &mut R) -> ImageResult<Vec<DirEntry>> {
+    let _reserved = r.read_u16::<LittleEndian>()?;
+    let _type = r.read_u16::<LittleEndian>()?;
+    let count = r.read_u16::<LittleEndian>()?;
+    (0..count).map(|_| read_entry(r)).collect()
+}
+
+fn read_entry<R: Read>(r: &mut R) -> ImageResult<DirEntry> {
+    Ok(DirEntry {
+        width: r.read_u8()?,
+        height: r.read_u8()?,
+        color_count: r.read_u8()?,
+        reserved: r.read_u8()?,
+        num_color_planes: {
+            // This may be either the number of color planes (0 or 1), or the horizontal coordinate
+            // of the hotspot for CUR files.
+            let num = r.read_u16::<LittleEndian>()?;
+            if num > 256 {
+                return Err(DecoderError::IcoEntryTooManyPlanesOrHotspot.into());
+            }
+            num
+        },
+        bits_per_pixel: {
+            // This may be either the bit depth (may be 0 meaning unspecified),
+            // or the vertical coordinate of the hotspot for CUR files.
+            let num = r.read_u16::<LittleEndian>()?;
+            if num > 256 {
+                return Err(DecoderError::IcoEntryTooManyBitsPerPixelOrHotspot.into());
+            }
+            num
+        },
+        image_length: r.read_u32::<LittleEndian>()?,
+        image_offset: r.read_u32::<LittleEndian>()?,
+    })
+}
+
+/// Find the entry with the highest (color depth, size).
+fn best_entry(mut entries: Vec<DirEntry>) -> ImageResult<DirEntry> {
+    let mut best = entries.pop().ok_or(DecoderError::NoEntries)?;
+
+    let mut best_score = (
+        best.bits_per_pixel,
+        u32::from(best.real_width()) * u32::from(best.real_height()),
+    );
+
+    for entry in entries {
+        let score = (
+            entry.bits_per_pixel,
+            u32::from(entry.real_width()) * u32::from(entry.real_height()),
+        );
+        if score > best_score {
+            best = entry;
+            best_score = score;
+        }
+    }
+    Ok(best)
+}
+
+impl DirEntry {
+    fn real_width(&self) -> u16 {
+        match self.width {
+            0 => 256,
+            w => u16::from(w),
+        }
+    }
+
+    fn real_height(&self) -> u16 {
+        match self.height {
+            0 => 256,
+            h => u16::from(h),
+        }
+    }
+
+    fn matches_dimensions(&self, width: u32, height: u32) -> bool {
+        u32::from(self.real_width()) == width.min(256)
+            && u32::from(self.real_height()) == height.min(256)
+    }
+
+    fn seek_to_start<R: Read + Seek>(&self, r: &mut R) -> ImageResult<()> {
+        r.seek(SeekFrom::Start(u64::from(self.image_offset)))?;
+        Ok(())
+    }
+
+    fn is_png<R: Read + Seek>(&self, r: &mut R) -> ImageResult<bool> {
+        self.seek_to_start(r)?;
+
+        // Read the first 8 bytes to sniff the image.
+        let mut signature = [0u8; 8];
+        r.read_exact(&mut signature)?;
+
+        Ok(signature == PNG_SIGNATURE)
+    }
+
+    fn decoder<R: Read + Seek>(&self, mut r: R) -> ImageResult<InnerDecoder<R>> {
+        let is_png = self.is_png(&mut r)?;
+        self.seek_to_start(&mut r)?;
+
+        if is_png {
+            Ok(Png(Box::new(PngDecoder::new(r)?)))
+        } else {
+            Ok(Bmp(BmpDecoder::new_with_ico_format(r)?))
+        }
+    }
+}
+
+/// Wrapper struct around a `Cursor<Vec<u8>>`
+pub struct IcoReader<R>(Cursor<Vec<u8>>, PhantomData<R>);
+impl<R> Read for IcoReader<R> {
+    fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
+        self.0.read(buf)
+    }
+    fn read_to_end(&mut self, buf: &mut Vec<u8>) -> io::Result<usize> {
+        if self.0.position() == 0 && buf.is_empty() {
+            mem::swap(buf, self.0.get_mut());
+            Ok(buf.len())
+        } else {
+            self.0.read_to_end(buf)
+        }
+    }
+}
+
+impl<'a, R: 'a + Read + Seek> ImageDecoder<'a> for IcoDecoder<R> {
+    type Reader = IcoReader<R>;
+
+    fn dimensions(&self) -> (u32, u32) {
+        match self.inner_decoder {
+            Bmp(ref decoder) => decoder.dimensions(),
+            Png(ref decoder) => decoder.dimensions(),
+        }
+    }
+
+    fn color_type(&self) -> ColorType {
+        match self.inner_decoder {
+            Bmp(ref decoder) => decoder.color_type(),
+            Png(ref decoder) => decoder.color_type(),
+        }
+    }
+
+    fn into_reader(self) -> ImageResult<Self::Reader> {
+        Ok(IcoReader(
+            Cursor::new(image::decoder_to_vec(self)?),
+            PhantomData,
+        ))
+    }
+
+    fn read_image(self, buf: &mut [u8]) -> ImageResult<()> {
+        assert_eq!(u64::try_from(buf.len()), Ok(self.total_bytes()));
+        match self.inner_decoder {
+            Png(decoder) => {
+                if self.selected_entry.image_length < PNG_SIGNATURE.len() as u32 {
+                    return Err(DecoderError::PngShorterThanHeader.into());
+                }
+
+                // Check if the image dimensions match the ones in the image data.
+                let (width, height) = decoder.dimensions();
+                if !self.selected_entry.matches_dimensions(width, height) {
+                    return Err(DecoderError::ImageEntryDimensionMismatch {
+                        format: IcoEntryImageFormat::Png,
+                        entry: (
+                            self.selected_entry.real_width(),
+                            self.selected_entry.real_height(),
+                        ),
+                        image: (width, height),
+                    }
+                    .into());
+                }
+
+                // Embedded PNG images can only be of the 32BPP RGBA format.
+                // https://blogs.msdn.microsoft.com/oldnewthing/20101022-00/?p=12473/
+                if decoder.color_type() != ColorType::Rgba8 {
+                    return Err(DecoderError::PngNotRgba.into());
+                }
+
+                decoder.read_image(buf)
+            }
+            Bmp(mut decoder) => {
+                let (width, height) = decoder.dimensions();
+                if !self.selected_entry.matches_dimensions(width, height) {
+                    return Err(DecoderError::ImageEntryDimensionMismatch {
+                        format: IcoEntryImageFormat::Bmp,
+                        entry: (
+                            self.selected_entry.real_width(),
+                            self.selected_entry.real_height(),
+                        ),
+                        image: (width, height),
+                    }
+                    .into());
+                }
+
+                // The ICO decoder needs an alpha channel to apply the AND mask.
+                if decoder.color_type() != ColorType::Rgba8 {
+                    return Err(ImageError::Unsupported(
+                        UnsupportedError::from_format_and_kind(
+                            ImageFormat::Bmp.into(),
+                            UnsupportedErrorKind::Color(decoder.color_type().into()),
+                        ),
+                    ));
+                }
+
+                decoder.read_image_data(buf)?;
+
+                let r = decoder.reader();
+                let image_end = r.stream_position()?;
+                let data_end = u64::from(self.selected_entry.image_offset)
+                    + u64::from(self.selected_entry.image_length);
+
+                let mask_row_bytes = ((width + 31) / 32) * 4;
+                let mask_length = u64::from(mask_row_bytes) * u64::from(height);
+
+                // data_end should be image_end + the mask length (mask_row_bytes * height).
+                // According to
+                // https://devblogs.microsoft.com/oldnewthing/20101021-00/?p=12483
+                // the mask is required, but according to Wikipedia
+                // https://en.wikipedia.org/wiki/ICO_(file_format)
+                // the mask is not required. Unfortunately, Wikipedia does not have a citation
+                // for that claim, so we can't be sure which is correct.
+                if data_end >= image_end + mask_length {
+                    // If there's an AND mask following the image, read and apply it.
+                    for y in 0..height {
+                        let mut x = 0;
+                        for _ in 0..mask_row_bytes {
+                            // Apply the bits of each byte until we reach the end of the row.
+                            let mask_byte = r.read_u8()?;
+                            for bit in (0..8).rev() {
+                                if x >= width {
+                                    break;
+                                }
+                                if mask_byte & (1 << bit) != 0 {
+                                    // Set alpha channel to transparent.
+                                    buf[((height - y - 1) * width + x) as usize * 4 + 3] = 0;
+                                }
+                                x += 1;
+                            }
+                        }
+                    }
+
+                    Ok(())
+                } else if data_end == image_end {
+                    // accept images with no mask data
+                    Ok(())
+                } else {
+                    Err(DecoderError::InvalidDataSize.into())
+                }
+            }
+        }
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    // Test if BMP images without alpha channel inside ICOs don't panic.
+    // Because the test data is invalid decoding should produce an error.
+    #[test]
+    fn bmp_16_with_missing_alpha_channel() {
+        let data = vec![
+            0x00, 0x00, 0x01, 0x00, 0x01, 0x00, 0x0e, 0x04, 0xc3, 0x7e, 0x00, 0x00, 0x00, 0x00,
+            0x7c, 0x00, 0x00, 0x00, 0x0e, 0x00, 0x00, 0x00, 0xf8, 0xff, 0xff, 0xff, 0x01, 0x00,
+            0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x12, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x8f, 0xf6, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0x20, 0x66, 0x74, 0x83, 0x70, 0x61, 0x76, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02,
+            0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xeb, 0x00, 0x9b, 0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x4e, 0x47, 0x0d,
+            0x0a, 0x1a, 0x0a, 0x00, 0x00, 0x00, 0x62, 0x49, 0x48, 0x44, 0x52, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x0c,
+            0x00, 0x00, 0x00, 0xc3, 0x3f, 0x94, 0x61, 0xaa, 0x17, 0x4d, 0x8d, 0x79, 0x1d, 0x8b,
+            0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x14, 0x2e, 0x28, 0x40, 0xe5, 0x9f,
+            0x4b, 0x4d, 0xe9, 0x87, 0xd3, 0xda, 0xd6, 0x89, 0x81, 0xc5, 0xa4, 0xa1, 0x60, 0x98,
+            0x31, 0xc7, 0x1d, 0xb6, 0x8f, 0x20, 0xc8, 0x3e, 0xee, 0xd8, 0xe4, 0x8f, 0xee, 0x7b,
+            0x48, 0x9b, 0x88, 0x25, 0x13, 0xda, 0xa4, 0x13, 0xa4, 0x00, 0x00, 0x00, 0x00, 0x40,
+            0x16, 0x01, 0xff, 0xff, 0xff, 0xff, 0xe9, 0x0c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0xa3, 0x66, 0x64, 0x41, 0x54, 0xa3, 0xa3, 0x00, 0x00, 0x00, 0xb8, 0x00,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xa3, 0x66, 0x64, 0x41, 0x54, 0xa3, 0xa3,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x8f, 0xf6, 0xff, 0xff,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x20, 0x66, 0x74, 0x83, 0x70, 0x61, 0x76,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff,
+            0xeb, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a, 0x00, 0x00, 0x00, 0x62, 0x49,
+            0x48, 0x44, 0x52, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0xff, 0xff, 0x94, 0xc8, 0x00, 0x02, 0x0c, 0x00, 0xff, 0xff, 0xc6,
+            0x84, 0x00, 0x2a, 0x75, 0x03, 0xa3, 0x05, 0xfb, 0xe1, 0x6e, 0xe8, 0x27, 0xd6, 0xd3,
+            0x96, 0xc1, 0xe4, 0x30, 0x0c, 0x05, 0xb9, 0xa3, 0x8b, 0x29, 0xda, 0xa4, 0xf1, 0x4d,
+            0xf3, 0xb2, 0x98, 0x2b, 0xe6, 0x93, 0x07, 0xf9, 0xca, 0x2b, 0xc2, 0x39, 0x20, 0xba,
+            0x7c, 0xa0, 0xb1, 0x43, 0xe6, 0xf9, 0xdc, 0xd1, 0xc2, 0x52, 0xdc, 0x41, 0xc1, 0x2f,
+            0x29, 0xf7, 0x46, 0x32, 0xda, 0x1b, 0x72, 0x8c, 0xe6, 0x2b, 0x01, 0xe5, 0x49, 0x21,
+            0x89, 0x89, 0xe4, 0x3d, 0xa1, 0xdb, 0x3b, 0x4a, 0x0b, 0x52, 0x86, 0x52, 0x33, 0x9d,
+            0xb2, 0xcf, 0x4a, 0x86, 0x53, 0xd7, 0xa9, 0x4b, 0xaf, 0x62, 0x06, 0x49, 0x53, 0x00,
+            0xc3, 0x3f, 0x94, 0x61, 0xaa, 0x17, 0x4d, 0x8d, 0x79, 0x1d, 0x8b, 0x10, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x14, 0x2e, 0x28, 0x40, 0xe5, 0x9f, 0x4b, 0x4d, 0xe9,
+            0x87, 0xd3, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xe7, 0xc5, 0x00,
+            0x02, 0x00, 0x00, 0x00, 0x06, 0x00, 0x0b, 0x00, 0x50, 0x31, 0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x06, 0x76, 0x76, 0x01, 0x00, 0x00, 0x00, 0x76, 0x00,
+            0x00, 0x23, 0x3f, 0x52, 0x41, 0x44, 0x49, 0x41, 0x4e, 0x43, 0x45, 0x61, 0x50, 0x35,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0x4d, 0x47, 0x49, 0x46, 0x38, 0x37, 0x61, 0x05,
+            0x50, 0x37, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc7, 0x37, 0x61,
+        ];
+
+        let decoder = IcoDecoder::new(Cursor::new(&data)).unwrap();
+        let mut buf = vec![0; usize::try_from(decoder.total_bytes()).unwrap()];
+        assert!(decoder.read_image(&mut buf).is_err());
+    }
+}
diff --git a/vendor/image/src/codecs/ico/encoder.rs b/vendor/image/src/codecs/ico/encoder.rs
new file mode 100644
index 0000000..dd5961b
--- /dev/null
+++ b/vendor/image/src/codecs/ico/encoder.rs
@@ -0,0 +1,194 @@
+use byteorder::{LittleEndian, WriteBytesExt};
+use std::borrow::Cow;
+use std::io::{self, Write};
+
+use crate::color::ColorType;
+use crate::error::{ImageError, ImageResult, ParameterError, ParameterErrorKind};
+use crate::image::ImageEncoder;
+
+use crate::codecs::png::PngEncoder;
+
+// Enum value indicating an ICO image (as opposed to a CUR image):
+const ICO_IMAGE_TYPE: u16 = 1;
+// The length of an ICO file ICONDIR structure, in bytes:
+const ICO_ICONDIR_SIZE: u32 = 6;
+// The length of an ICO file DIRENTRY structure, in bytes:
+const ICO_DIRENTRY_SIZE: u32 = 16;
+
+/// ICO encoder
+pub struct IcoEncoder<W: Write> {
+    w: W,
+}
+
+/// An ICO image entry
+pub struct IcoFrame<'a> {
+    // Pre-encoded PNG or BMP
+    encoded_image: Cow<'a, [u8]>,
+    // Stored as `0 => 256, n => n`
+    width: u8,
+    // Stored as `0 => 256, n => n`
+    height: u8,
+    color_type: ColorType,
+}
+
+impl<'a> IcoFrame<'a> {
+    /// Construct a new `IcoFrame` using a pre-encoded PNG or BMP
+    ///
+    /// The `width` and `height` must be between 1 and 256 (inclusive).
+    pub fn with_encoded(
+        encoded_image: impl Into<Cow<'a, [u8]>>,
+        width: u32,
+        height: u32,
+        color_type: ColorType,
+    ) -> ImageResult<Self> {
+        let encoded_image = encoded_image.into();
+
+        if !(1..=256).contains(&width) {
+            return Err(ImageError::Parameter(ParameterError::from_kind(
+                ParameterErrorKind::Generic(format!(
+                    "the image width must be `1..=256`, instead width {} was provided",
+                    width,
+                )),
+            )));
+        }
+
+        if !(1..=256).contains(&height) {
+            return Err(ImageError::Parameter(ParameterError::from_kind(
+                ParameterErrorKind::Generic(format!(
+                    "the image height must be `1..=256`, instead height {} was provided",
+                    height,
+                )),
+            )));
+        }
+
+        Ok(Self {
+            encoded_image,
+            width: width as u8,
+            height: height as u8,
+            color_type,
+        })
+    }
+
+    /// Construct a new `IcoFrame` by encoding `buf` as a PNG
+    ///
+    /// The `width` and `height` must be between 1 and 256 (inclusive)
+    pub fn as_png(buf: &[u8], width: u32, height: u32, color_type: ColorType) -> ImageResult<Self> {
+        let mut image_data: Vec<u8> = Vec::new();
+        PngEncoder::new(&mut image_data).write_image(buf, width, height, color_type)?;
+
+        let frame = Self::with_encoded(image_data, width, height, color_type)?;
+        Ok(frame)
+    }
+}
+
+impl<W: Write> IcoEncoder<W> {
+    /// Create a new encoder that writes its output to ```w```.
+    pub fn new(w: W) -> IcoEncoder<W> {
+        IcoEncoder { w }
+    }
+
+    /// Encodes the image ```image``` that has dimensions ```width``` and
+    /// ```height``` and ```ColorType``` ```c```.  The dimensions of the image
+    /// must be between 1 and 256 (inclusive) or an error will be returned.
+    ///
+    /// Expects data to be big endian.
+    #[deprecated = "Use `IcoEncoder::write_image` instead. Beware that `write_image` has a different endianness convention"]
+    pub fn encode(self, data: &[u8], width: u32, height: u32, color: ColorType) -> ImageResult<()> {
+        let mut image_data: Vec<u8> = Vec::new();
+        #[allow(deprecated)]
+        PngEncoder::new(&mut image_data).encode(data, width, height, color)?;
+
+        let image = IcoFrame::with_encoded(&image_data, width, height, color)?;
+        self.encode_images(&[image])
+    }
+
+    /// Takes some [`IcoFrame`]s and encodes them into an ICO.
+    ///
+    /// `images` is a list of images, usually ordered by dimension, which
+    /// must be between 1 and 65535 (inclusive) in length.
+    pub fn encode_images(mut self, images: &[IcoFrame<'_>]) -> ImageResult<()> {
+        if !(1..=usize::from(u16::MAX)).contains(&images.len()) {
+            return Err(ImageError::Parameter(ParameterError::from_kind(
+                ParameterErrorKind::Generic(format!(
+                    "the number of images must be `1..=u16::MAX`, instead {} images were provided",
+                    images.len(),
+                )),
+            )));
+        }
+        let num_images = images.len() as u16;
+
+        let mut offset = ICO_ICONDIR_SIZE + (ICO_DIRENTRY_SIZE * (images.len() as u32));
+        write_icondir(&mut self.w, num_images)?;
+        for image in images {
+            write_direntry(
+                &mut self.w,
+                image.width,
+                image.height,
+                image.color_type,
+                offset,
+                image.encoded_image.len() as u32,
+            )?;
+
+            offset += image.encoded_image.len() as u32;
+        }
+        for image in images {
+            self.w.write_all(&image.encoded_image)?;
+        }
+        Ok(())
+    }
+}
+
+impl<W: Write> ImageEncoder for IcoEncoder<W> {
+    /// Write an ICO image with the specified width, height, and color type.
+    ///
+    /// For color types with 16-bit per channel or larger, the contents of `buf` should be in
+    /// native endian.
+    ///
+    /// WARNING: In image 0.23.14 and earlier this method erroneously expected buf to be in big endian.
+    fn write_image(
+        self,
+        buf: &[u8],
+        width: u32,
+        height: u32,
+        color_type: ColorType,
+    ) -> ImageResult<()> {
+        let image = IcoFrame::as_png(buf, width, height, color_type)?;
+        self.encode_images(&[image])
+    }
+}
+
+fn write_icondir<W: Write>(w: &mut W, num_images: u16) -> io::Result<()> {
+    // Reserved field (must be zero):
+    w.write_u16::<LittleEndian>(0)?;
+    // Image type (ICO or CUR):
+    w.write_u16::<LittleEndian>(ICO_IMAGE_TYPE)?;
+    // Number of images in the file:
+    w.write_u16::<LittleEndian>(num_images)?;
+    Ok(())
+}
+
+fn write_direntry<W: Write>(
+    w: &mut W,
+    width: u8,
+    height: u8,
+    color: ColorType,
+    data_start: u32,
+    data_size: u32,
+) -> io::Result<()> {
+    // Image dimensions:
+    w.write_u8(width)?;
+    w.write_u8(height)?;
+    // Number of colors in palette (or zero for no palette):
+    w.write_u8(0)?;
+    // Reserved field (must be zero):
+    w.write_u8(0)?;
+    // Color planes:
+    w.write_u16::<LittleEndian>(0)?;
+    // Bits per pixel:
+    w.write_u16::<LittleEndian>(color.bits_per_pixel())?;
+    // Image data size, in bytes:
+    w.write_u32::<LittleEndian>(data_size)?;
+    // Image data offset, in bytes:
+    w.write_u32::<LittleEndian>(data_start)?;
+    Ok(())
+}
diff --git a/vendor/image/src/codecs/ico/mod.rs b/vendor/image/src/codecs/ico/mod.rs
new file mode 100644
index 0000000..11493ac
--- /dev/null
+++ b/vendor/image/src/codecs/ico/mod.rs
@@ -0,0 +1,14 @@
+//!  Decoding and Encoding of ICO files
+//!
+//!  A decoder and encoder for ICO (Windows Icon) image container files.
+//!
+//!  # Related Links
+//!  * <https://msdn.microsoft.com/en-us/library/ms997538.aspx>
+//!  * <https://en.wikipedia.org/wiki/ICO_%28file_format%29>
+
+pub use self::decoder::IcoDecoder;
+#[allow(deprecated)]
+pub use self::encoder::{IcoEncoder, IcoFrame};
+
+mod decoder;
+mod encoder;