diff options
Diffstat (limited to 'src/jpg/segment.rs')
-rw-r--r-- | src/jpg/segment.rs | 66 |
1 files changed, 0 insertions, 66 deletions
diff --git a/src/jpg/segment.rs b/src/jpg/segment.rs deleted file mode 100644 index f54d0e2..0000000 --- a/src/jpg/segment.rs +++ /dev/null @@ -1,66 +0,0 @@ -use std::{mem::size_of, usize}; - -use img_parts::jpeg::{markers, Jpeg, JpegSegment}; -use thiserror::Error; - -use crate::codec::Codec; - -#[derive(Debug, PartialEq, Eq)] -pub struct JpegSegmentCodec { - pub start_index: usize, -} - -impl Codec for JpegSegmentCodec { - type Carrier = Vec<u8>; - type Payload = Vec<u8>; - type Output = Self::Carrier; - type Error = JpegSegmentError; - - fn encode(&self, carrier: impl Into<Self::Carrier>, payload: impl Into<Self::Payload>) -> Result<Self::Output, Self::Error> { - let mut jpeg = match Jpeg::from_bytes(carrier.into().into()) { - Ok(image) => image, - Err(err) => return Err(JpegSegmentError::ParseFailed { inner: err }) - }; - let mut payload_bytes: Self::Carrier = payload.into(); - let segment_count = ((payload_bytes.len() + size_of::<u64>()) as u64).div_ceil((u16::MAX as usize - size_of::<u16>()) as u64); - payload_bytes.splice(0..0, segment_count.to_le_bytes()); - for (index, payload_chunk) in payload_bytes.chunks(u16::MAX as usize - size_of::<u16>()).enumerate() { - let segment = JpegSegment::new_with_contents(markers::COM, payload_chunk.to_vec().into()); - jpeg.segments_mut().insert(self.start_index + index, segment); - } - Ok(jpeg.encoder().bytes().to_vec()) - } - - fn decode(&self, encoded: impl Into<Self::Output>) -> Result<(Self::Carrier, Self::Payload), Self::Error> { - let mut jpeg = match Jpeg::from_bytes(encoded.into().into()) { - Ok(image) => image, - Err(err) => return Err(JpegSegmentError::ParseFailed { inner: err }) - }; - let segment = jpeg.segments_mut().remove(self.start_index); - let segment_bytes = segment.contents(); - let segment_count = u64::from_le_bytes(segment_bytes[0..size_of::<u64>()].try_into().unwrap()) as usize; - let mut payload_vec: Vec<u8> = Vec::with_capacity((u16::MAX as usize - size_of::<u16>()) * segment_count); - payload_vec.extend(segment_bytes[size_of::<u64>()..].to_vec()); - - for _ in 0..segment_count-1 { - let segment = jpeg.segments_mut().remove(self.start_index); - payload_vec.extend(segment.contents()); - } - - Ok((jpeg.encoder().bytes().to_vec(), payload_vec)) - } -} - -impl Default for JpegSegmentCodec { - fn default() -> Self { - Self { - start_index: 3, - } - } -} - -#[derive(Error, Debug)] -pub enum JpegSegmentError { - #[error("Failed to parse JPEG data: {inner:?}")] - ParseFailed { inner: img_parts::Error } -} |