1 files changed, 399 insertions, 0 deletions
diff --git a/vendor/image/src/codecs/webp/decoder.rs b/vendor/image/src/codecs/webp/decoder.rs
new file mode 100644
index 0000000..9120290
--- /dev/null
+++ b/vendor/image/src/codecs/webp/decoder.rs
@@ -0,0 +1,399 @@
+use byteorder::{LittleEndian, ReadBytesExt};
+use std::convert::TryFrom;
+use std::io::{self, Cursor, Error, Read};
+use std::marker::PhantomData;
+use std::{error, fmt, mem};
+
+use crate::error::{DecodingError, ImageError, ImageResult, ParameterError, ParameterErrorKind};
+use crate::image::{ImageDecoder, ImageFormat};
+use crate::{color, AnimationDecoder, Frames, Rgba};
+
+use super::lossless::{LosslessDecoder, LosslessFrame};
+use super::vp8::{Frame as VP8Frame, Vp8Decoder};
+
+use super::extended::{read_extended_header, ExtendedImage};
+
+/// All errors that can occur when attempting to parse a WEBP container
+#[derive(Debug, Clone, Copy)]
+pub(crate) enum DecoderError {
+    /// RIFF's "RIFF" signature not found or invalid
+    RiffSignatureInvalid([u8; 4]),
+    /// WebP's "WEBP" signature not found or invalid
+    WebpSignatureInvalid([u8; 4]),
+    /// Chunk Header was incorrect or invalid in its usage
+    ChunkHeaderInvalid([u8; 4]),
+}
+
+impl fmt::Display for DecoderError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        struct SignatureWriter([u8; 4]);
+        impl fmt::Display for SignatureWriter {
+            fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+                write!(
+                    f,
+                    "[{:#04X?}, {:#04X?}, {:#04X?}, {:#04X?}]",
+                    self.0[0], self.0[1], self.0[2], self.0[3]
+                )
+            }
+        }
+
+        match self {
+            DecoderError::RiffSignatureInvalid(riff) => f.write_fmt(format_args!(
+                "Invalid RIFF signature: {}",
+                SignatureWriter(*riff)
+            )),
+            DecoderError::WebpSignatureInvalid(webp) => f.write_fmt(format_args!(
+                "Invalid WebP signature: {}",
+                SignatureWriter(*webp)
+            )),
+            DecoderError::ChunkHeaderInvalid(header) => f.write_fmt(format_args!(
+                "Invalid Chunk header: {}",
+                SignatureWriter(*header)
+            )),
+        }
+    }
+}
+
+impl From<DecoderError> for ImageError {
+    fn from(e: DecoderError) -> ImageError {
+        ImageError::Decoding(DecodingError::new(ImageFormat::WebP.into(), e))
+    }
+}
+
+impl error::Error for DecoderError {}
+
+/// All possible RIFF chunks in a WebP image file
+#[allow(clippy::upper_case_acronyms)]
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub(crate) enum WebPRiffChunk {
+    RIFF,
+    WEBP,
+    VP8,
+    VP8L,
+    VP8X,
+    ANIM,
+    ANMF,
+    ALPH,
+    ICCP,
+    EXIF,
+    XMP,
+}
+
+impl WebPRiffChunk {
+    pub(crate) fn from_fourcc(chunk_fourcc: [u8; 4]) -> ImageResult<Self> {
+        match &chunk_fourcc {
+            b"RIFF" => Ok(Self::RIFF),
+            b"WEBP" => Ok(Self::WEBP),
+            b"VP8 " => Ok(Self::VP8),
+            b"VP8L" => Ok(Self::VP8L),
+            b"VP8X" => Ok(Self::VP8X),
+            b"ANIM" => Ok(Self::ANIM),
+            b"ANMF" => Ok(Self::ANMF),
+            b"ALPH" => Ok(Self::ALPH),
+            b"ICCP" => Ok(Self::ICCP),
+            b"EXIF" => Ok(Self::EXIF),
+            b"XMP " => Ok(Self::XMP),
+            _ => Err(DecoderError::ChunkHeaderInvalid(chunk_fourcc).into()),
+        }
+    }
+
+    pub(crate) fn to_fourcc(&self) -> [u8; 4] {
+        match self {
+            Self::RIFF => *b"RIFF",
+            Self::WEBP => *b"WEBP",
+            Self::VP8 => *b"VP8 ",
+            Self::VP8L => *b"VP8L",
+            Self::VP8X => *b"VP8X",
+            Self::ANIM => *b"ANIM",
+            Self::ANMF => *b"ANMF",
+            Self::ALPH => *b"ALPH",
+            Self::ICCP => *b"ICCP",
+            Self::EXIF => *b"EXIF",
+            Self::XMP => *b"XMP ",
+        }
+    }
+}
+
+enum WebPImage {
+    Lossy(VP8Frame),
+    Lossless(LosslessFrame),
+    Extended(ExtendedImage),
+}
+
+/// WebP Image format decoder. Currently only supports lossy RGB images or lossless RGBA images.
+pub struct WebPDecoder<R> {
+    r: R,
+    image: WebPImage,
+}
+
+impl<R: Read> WebPDecoder<R> {
+    /// Create a new WebPDecoder from the Reader ```r```.
+    /// This function takes ownership of the Reader.
+    pub fn new(r: R) -> ImageResult<WebPDecoder<R>> {
+        let image = WebPImage::Lossy(Default::default());
+
+        let mut decoder = WebPDecoder { r, image };
+        decoder.read_data()?;
+        Ok(decoder)
+    }
+
+    //reads the 12 bytes of the WebP file header
+    fn read_riff_header(&mut self) -> ImageResult<u32> {
+        let mut riff = [0; 4];
+        self.r.read_exact(&mut riff)?;
+        if &riff != b"RIFF" {
+            return Err(DecoderError::RiffSignatureInvalid(riff).into());
+        }
+
+        let size = self.r.read_u32::<LittleEndian>()?;
+
+        let mut webp = [0; 4];
+        self.r.read_exact(&mut webp)?;
+        if &webp != b"WEBP" {
+            return Err(DecoderError::WebpSignatureInvalid(webp).into());
+        }
+
+        Ok(size)
+    }
+
+    //reads the chunk header, decodes the frame and returns the inner decoder
+    fn read_frame(&mut self) -> ImageResult<WebPImage> {
+        let chunk = read_chunk(&mut self.r)?;
+
+        match chunk {
+            Some((cursor, WebPRiffChunk::VP8)) => {
+                let mut vp8_decoder = Vp8Decoder::new(cursor);
+                let frame = vp8_decoder.decode_frame()?;
+
+                Ok(WebPImage::Lossy(frame.clone()))
+            }
+            Some((cursor, WebPRiffChunk::VP8L)) => {
+                let mut lossless_decoder = LosslessDecoder::new(cursor);
+                let frame = lossless_decoder.decode_frame()?;
+
+                Ok(WebPImage::Lossless(frame.clone()))
+            }
+            Some((mut cursor, WebPRiffChunk::VP8X)) => {
+                let info = read_extended_header(&mut cursor)?;
+
+                let image = ExtendedImage::read_extended_chunks(&mut self.r, info)?;
+
+                Ok(WebPImage::Extended(image))
+            }
+            None => Err(ImageError::IoError(Error::from(
+                io::ErrorKind::UnexpectedEof,
+            ))),
+            Some((_, chunk)) => Err(DecoderError::ChunkHeaderInvalid(chunk.to_fourcc()).into()),
+        }
+    }
+
+    fn read_data(&mut self) -> ImageResult<()> {
+        let _size = self.read_riff_header()?;
+
+        let image = self.read_frame()?;
+
+        self.image = image;
+
+        Ok(())
+    }
+
+    /// Returns true if the image as described by the bitstream is animated.
+    pub fn has_animation(&self) -> bool {
+        match &self.image {
+            WebPImage::Lossy(_) => false,
+            WebPImage::Lossless(_) => false,
+            WebPImage::Extended(extended) => extended.has_animation(),
+        }
+    }
+
+    /// Sets the background color if the image is an extended and animated webp.
+    pub fn set_background_color(&mut self, color: Rgba<u8>) -> ImageResult<()> {
+        match &mut self.image {
+            WebPImage::Extended(image) => image.set_background_color(color),
+            _ => Err(ImageError::Parameter(ParameterError::from_kind(
+                ParameterErrorKind::Generic(
+                    "Background color can only be set on animated webp".to_owned(),
+                ),
+            ))),
+        }
+    }
+}
+
+pub(crate) fn read_len_cursor<R>(r: &mut R) -> ImageResult<Cursor<Vec<u8>>>
+where
+    R: Read,
+{
+    let unpadded_len = u64::from(r.read_u32::<LittleEndian>()?);
+
+    // RIFF chunks containing an uneven number of bytes append
+    // an extra 0x00 at the end of the chunk
+    //
+    // The addition cannot overflow since we have a u64 that was created from a u32
+    let len = unpadded_len + (unpadded_len % 2);
+
+    let mut framedata = Vec::new();
+    r.by_ref().take(len).read_to_end(&mut framedata)?;
+
+    //remove padding byte
+    if unpadded_len % 2 == 1 {
+        framedata.pop();
+    }
+
+    Ok(io::Cursor::new(framedata))
+}
+
+/// Reads a chunk header FourCC
+/// Returns None if and only if we hit end of file reading the four character code of the chunk
+/// The inner error is `Err` if and only if the chunk header FourCC is present but unknown
+pub(crate) fn read_fourcc<R: Read>(r: &mut R) -> ImageResult<Option<ImageResult<WebPRiffChunk>>> {
+    let mut chunk_fourcc = [0; 4];
+    let result = r.read_exact(&mut chunk_fourcc);
+
+    match result {
+        Ok(()) => {}
+        Err(err) => {
+            if err.kind() == io::ErrorKind::UnexpectedEof {
+                return Ok(None);
+            } else {
+                return Err(err.into());
+            }
+        }
+    }
+
+    let chunk = WebPRiffChunk::from_fourcc(chunk_fourcc);
+    Ok(Some(chunk))
+}
+
+/// Reads a chunk
+/// Returns an error if the chunk header is not a valid webp header or some other reading error
+/// Returns None if and only if we hit end of file reading the four character code of the chunk
+pub(crate) fn read_chunk<R>(r: &mut R) -> ImageResult<Option<(Cursor<Vec<u8>>, WebPRiffChunk)>>
+where
+    R: Read,
+{
+    if let Some(chunk) = read_fourcc(r)? {
+        let chunk = chunk?;
+        let cursor = read_len_cursor(r)?;
+        Ok(Some((cursor, chunk)))
+    } else {
+        Ok(None)
+    }
+}
+
+/// Wrapper struct around a `Cursor<Vec<u8>>`
+pub struct WebpReader<R>(Cursor<Vec<u8>>, PhantomData<R>);
+impl<R> Read for WebpReader<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> ImageDecoder<'a> for WebPDecoder<R> {
+    type Reader = WebpReader<R>;
+
+    fn dimensions(&self) -> (u32, u32) {
+        match &self.image {
+            WebPImage::Lossy(vp8_frame) => {
+                (u32::from(vp8_frame.width), u32::from(vp8_frame.height))
+            }
+            WebPImage::Lossless(lossless_frame) => (
+                u32::from(lossless_frame.width),
+                u32::from(lossless_frame.height),
+            ),
+            WebPImage::Extended(extended) => extended.dimensions(),
+        }
+    }
+
+    fn color_type(&self) -> color::ColorType {
+        match &self.image {
+            WebPImage::Lossy(_) => color::ColorType::Rgb8,
+            WebPImage::Lossless(_) => color::ColorType::Rgba8,
+            WebPImage::Extended(extended) => extended.color_type(),
+        }
+    }
+
+    fn into_reader(self) -> ImageResult<Self::Reader> {
+        match &self.image {
+            WebPImage::Lossy(vp8_frame) => {
+                let mut data = vec![0; vp8_frame.get_buf_size()];
+                vp8_frame.fill_rgb(data.as_mut_slice());
+                Ok(WebpReader(Cursor::new(data), PhantomData))
+            }
+            WebPImage::Lossless(lossless_frame) => {
+                let mut data = vec![0; lossless_frame.get_buf_size()];
+                lossless_frame.fill_rgba(data.as_mut_slice());
+                Ok(WebpReader(Cursor::new(data), PhantomData))
+            }
+            WebPImage::Extended(extended) => {
+                let mut data = vec![0; extended.get_buf_size()];
+                extended.fill_buf(data.as_mut_slice());
+                Ok(WebpReader(Cursor::new(data), PhantomData))
+            }
+        }
+    }
+
+    fn read_image(self, buf: &mut [u8]) -> ImageResult<()> {
+        assert_eq!(u64::try_from(buf.len()), Ok(self.total_bytes()));
+
+        match &self.image {
+            WebPImage::Lossy(vp8_frame) => {
+                vp8_frame.fill_rgb(buf);
+            }
+            WebPImage::Lossless(lossless_frame) => {
+                lossless_frame.fill_rgba(buf);
+            }
+            WebPImage::Extended(extended) => {
+                extended.fill_buf(buf);
+            }
+        }
+        Ok(())
+    }
+
+    fn icc_profile(&mut self) -> Option<Vec<u8>> {
+        if let WebPImage::Extended(extended) = &self.image {
+            extended.icc_profile()
+        } else {
+            None
+        }
+    }
+}
+
+impl<'a, R: 'a + Read> AnimationDecoder<'a> for WebPDecoder<R> {
+    fn into_frames(self) -> Frames<'a> {
+        match self.image {
+            WebPImage::Lossy(_) | WebPImage::Lossless(_) => {
+                Frames::new(Box::new(std::iter::empty()))
+            }
+            WebPImage::Extended(extended_image) => extended_image.into_frames(),
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn add_with_overflow_size() {
+        let bytes = vec![
+            0x52, 0x49, 0x46, 0x46, 0xaf, 0x37, 0x80, 0x47, 0x57, 0x45, 0x42, 0x50, 0x6c, 0x64,
+            0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xfb, 0x7e, 0x73, 0x00, 0x06, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00, 0x05, 0x00, 0x00, 0x00, 0x65, 0x65, 0x65, 0x65, 0x65, 0x65,
+            0x40, 0xfb, 0xff, 0xff, 0x65, 0x65, 0x65, 0x65, 0x65, 0x65, 0x65, 0x65, 0x65, 0x65,
+            0x00, 0x00, 0x00, 0x00, 0x62, 0x00, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x49,
+            0x49, 0x54, 0x55, 0x50, 0x4c, 0x54, 0x59, 0x50, 0x45, 0x33, 0x37, 0x44, 0x4d, 0x46,
+        ];
+
+        let data = std::io::Cursor::new(bytes);
+
+        let _ = WebPDecoder::new(data);
+    }
+}