jpeg-decoder-0.1.22/.cargo_vcs_info.json0000644000000001121400477074300135040ustar { "git": { "sha1": "3bf223f7dcaa03cf0422e9e79eaf936ff406686f" } } jpeg-decoder-0.1.22/.github/workflows/rust.yml010064400017500001750000000020011370007336000174120ustar 00000000000000name: Rust CI on: push: branches: [ master, github-actions ] pull_request: branches: [ master ] jobs: build: runs-on: ubuntu-latest strategy: matrix: rust: ["1.34.2", stable, beta, nightly] features: ["", "rayon"] command: [test, benchmark] steps: - uses: actions/checkout@v2 - run: rustup default ${{ matrix.rust }} - name: build run: > cargo build --verbose --no-default-features --features "$FEATURES" - name: test run: > cargo test --tests --benches --no-default-features --features "$FEATURES" if: ${{ matrix.command == 'test' && matrix.rust != '1.34.2' }} env: FEATURES: ${{ matrix.features }} - name: benchmark run: cargo bench --bench decoding_benchmark --no-default-features --features "$FEATURES" -- --warm-up-time 1 --measurement-time 1 --sample-size 25 if: ${{ matrix.command == 'benchmark' && matrix.rust != '1.34.2' }} env: FEATURES: ${{ matrix.features }} jpeg-decoder-0.1.22/.gitignore010064400017500001750000000000231357303225700142770ustar 00000000000000Cargo.lock target/ jpeg-decoder-0.1.22/CHANGELOG.md010064400017500001750000000064601400431673700141310ustar 00000000000000# Change Log All notable changes to this project will be documented in this file. This project adheres to [Semantic Versioning](http://semver.org/). ## Unreleased ## v0.1.22 (2021-01-27) - Fix panic on jpeg without frames. ## v0.1.21 (2021-01-23) - Fix incorrect order of MCUs in non-interleaved streams - DCT Progressive images with incomplete coefficient blocks are now rendered - Fix a panic on invalid dimensions - Reduce allocations and runtime of decoding - Rework multi-threading to run a thread per component ## v0.1.20 (2020-07-04) - Fix decoding of some progressive images failing - Several more performance improvements - Add `PixelFormat::pixel_bytes` to determine the size of pixels - Cleanup and clarification of the 8x8 idct implementation - Updated fuzzing harnesses and helpers ## v0.1.19 (2020-04-27) - Fix decoding returning too much image data - Fix recognizing padding in marker segments - Several decode performance improvements - Remove use of deprecated `Error::description` ## v0.1.18 (2019-12-10) - Fix two bugs causing panics introduced in 0.1.17. ## v0.1.17 (2019-12-08) - Minimum supported rust version changed to 1.34 - Fix clippy::into_iter_on_array warning - Ignore extraneous bytes after SOS - Support IDCT Scaling ## v0.1.16 (2019-08-25) - Minimum supported rust version changed to 1.28 - Allow zero length DHT segments ## v0.1.15 (2018-06-10) - Added support for WebAssembly and asm.js (thanks @CryZe!) - Bugfix for images with APP14 segments longer than 12 bytes. ## v0.1.14 (2018-02-15) - Updated `rayon` to 1.0. ## v0.1.13 (2017-06-14) - Updated `rayon` to 0.8. ## v0.1.12 (2017-04-07) - Fixed an integer overflow in `derive_huffman_codes`. - Updated `rayon` to 0.7. ## v0.1.11 (2017-01-09) - Fixed an integer overflow. - Updated `byteorder` to 1.0. ## v0.1.10 (2016-12-23) - Updated `rayon` to 0.6 ## v0.1.9 (2016-12-12) - Added a generic integer upsampler, which brings support for some unusual subsampling schemes, e.g. 4:1:1 (thanks @iamrohit7!) - Made rayon optional through the `rayon` cargo feature (thanks @jackpot51!) ## v0.1.8 (2016-11-05) * Updated rayon to version 0.5. ## v0.1.7 (2016-10-04) - Added `UnsupportedFeature::NonIntegerSubsamplingRatio` error - Fixed a bug which could cause certain images to fail decoding - Fixed decoding of JPEGs which has a final RST marker in their entropy-coded data - Avoid allocating coefficients when calling `read_info()` on progressive JPEGs ## v0.1.6 (2016-07-12) - Added support for 16-bit quantization tables (even though the JPEG spec explicitly states "An 8-bit DCT-based process shall not use a 16-bit precision quantization table", but since libjpeg allows it there is little choice...) - Added support for decoding files with extraneous data (this violates the JPEG spec, but libjpeg allows it) - Fixed panic when decoding files without SOF - Fixed bug which caused files with certain APP marker segments to fail decoding ## v0.1.5 (2016-06-22) - Removed `euclid` and `num-rational` dependencies - Updated `rayon` to 0.4 ## v0.1.4 (2016-04-20) - Replaced `num` with `num-rational` ## v0.1.3 (2016-04-06) - Updated `byteorder` to 0.5 ## v0.1.2 (2016-03-08) - Fixed a bug which was causing some progressive JPEGs to fail decoding - Performance improvements ## v0.1.1 (2016-02-29) - Performance improvements ## v0.1.0 (2016-02-13) - Initial release jpeg-decoder-0.1.22/Cargo.lock0000644000000374531400477074300115010ustar # This file is automatically @generated by Cargo. # It is not intended for manual editing. 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"registry+https://github.com/rust-lang/crates.io-index" checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f" jpeg-decoder-0.1.22/Cargo.toml0000644000000021671400477074300115160ustar # THIS FILE IS AUTOMATICALLY GENERATED BY CARGO # # When uploading crates to the registry Cargo will automatically # "normalize" Cargo.toml files for maximal compatibility # with all versions of Cargo and also rewrite `path` dependencies # to registry (e.g., crates.io) dependencies # # If you believe there's an error in this file please file an # issue against the rust-lang/cargo repository. 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See the License for the specific language governing permissions and limitations under the License. jpeg-decoder-0.1.22/LICENSE-MIT010064400017500001750000000020741357303225700137530ustar 00000000000000MIT License Copyright (c) 2016 The jpeg-decoder Developers Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. 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IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. jpeg-decoder-0.1.22/README.md010064400017500001750000000017741367174505500136120ustar 00000000000000# jpeg-decoder [![Rust CI](https://github.com/image-rs/jpeg-decoder/workflows/Rust%20CI/badge.svg)](https://github.com/image-rs/jpeg-decoder/actions) [![AppVeyor Build Status](https://ci.appveyor.com/api/projects/status/k65rrkd0f8yb4o9w/branch/master?svg=true)](https://ci.appveyor.com/project/kaksmet/jpeg-decoder/branch/master) [![Crates.io](https://img.shields.io/crates/v/jpeg-decoder.svg)](https://crates.io/crates/jpeg-decoder) A Rust library for decoding JPEGs. [Documentation](https://docs.rs/jpeg-decoder) ## Example Cargo.toml: ```toml [dependencies] jpeg-decoder = "0.1" ``` main.rs: ```rust extern crate jpeg_decoder as jpeg; use std::fs::File; use std::io::BufReader; fn main() { let file = File::open("hello_world.jpg").expect("failed to open file"); let mut decoder = jpeg::Decoder::new(BufReader::new(file)); let pixels = decoder.decode().expect("failed to decode image"); let metadata = decoder.info().unwrap(); } ``` ## Requirements This crate compiles only with rust >= 1.34. jpeg-decoder-0.1.22/appveyor.yml010064400017500001750000000012311367172151600147030ustar 00000000000000environment: matrix: - TARGET: x86_64-pc-windows-msvc - TARGET: i686-pc-windows-msvc - TARGET: i686-pc-windows-gnu install: - ps: Start-FileDownload "https://static.rust-lang.org/dist/rust-nightly-${env:TARGET}.exe" - rust-nightly-%TARGET%.exe /VERYSILENT /NORESTART /DIR="C:\Program Files (x86)\Rust" - SET PATH=%PATH%;C:\Program Files (x86)\Rust\bin - SET PATH=%PATH%;C:\MinGW\bin - rustc -V - cargo -V build: false test_script: - cargo build --verbose - cargo test --tests --benches - cargo bench --bench decoding_benchmark --no-default-features --features "$FEATURES" -- --warm-up-time 1 --measurement-time 1 --sample-size 25 jpeg-decoder-0.1.22/benches/decoding_benchmark.rs010064400017500001750000000020351367714443400200650ustar 00000000000000extern crate criterion; extern crate jpeg_decoder; use criterion::{black_box, Criterion}; use jpeg_decoder as jpeg; use jpeg_decoder::ImageInfo; fn read_image(image: &[u8]) -> Vec { jpeg::Decoder::new(black_box(image)).decode().unwrap() } fn read_metadata(image: &[u8]) -> ImageInfo { let mut decoder = jpeg::Decoder::new(black_box(image)); decoder.read_info().unwrap(); decoder.info().unwrap() } fn main() { let mut c = Criterion::default().configure_from_args(); c.bench_function("decode a 512x512 JPEG", |b| b.iter(|| { read_image(include_bytes!("tower.jpg")) })); c.bench_function("decode a 512x512 progressive JPEG", |b| b.iter(|| { read_image(include_bytes!("tower_progressive.jpg")) })); c.bench_function("decode a 512x512 grayscale JPEG", |b| b.iter(|| { read_image(include_bytes!("tower_grayscale.jpg")) })); c.bench_function("extract metadata from an image", |b| b.iter(|| { read_metadata(include_bytes!("tower.jpg")) })); c.final_summary(); }jpeg-decoder-0.1.22/benches/tower.jpg010064400017500001750000002120011367172151600155630ustar 00000000000000JFIFHHExifMM* (1 2ï%OnePlusONEPLUS A5010HHGIMP 2.8.222019:11:26 22:37:44.6"'d0220>R fn v  ~|0100 d2019:11:09 10:59:362019:11:09 10:59:36)cddMM*3AD602695602695602695R980100N:ERjr 03Y'('+ ;$2019:11:09(HHJFIFC    $.' 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{ write!(io::stderr(), "usage: decode image.jpg image.png").unwrap(); process::exit(1) } fn main() { let mut args = env::args().skip(1); let input_path = args.next().unwrap_or_else(|| usage()); let output_path = args.next().unwrap_or_else(|| usage()); let input_file = File::open(input_path).expect("The specified input file could not be opened"); let mut decoder = jpeg::Decoder::new(BufReader::new(input_file)); let mut data = decoder.decode().expect("Decoding failed. If other software can successfully decode the specified JPEG image, then it's likely that there is a bug in jpeg-decoder"); let info = decoder.info().unwrap(); let output_file = File::create(output_path).unwrap(); let mut encoder = png::Encoder::new(output_file, info.width as u32, info.height as u32); encoder.set_depth(png::BitDepth::Eight); match info.pixel_format { jpeg::PixelFormat::L8 => encoder.set_color(png::ColorType::Grayscale), jpeg::PixelFormat::RGB24 => encoder.set_color(png::ColorType::RGB), jpeg::PixelFormat::CMYK32 => { data = cmyk_to_rgb(&mut data); encoder.set_color(png::ColorType::RGB) }, }; encoder.write_header() .expect("writing png header failed") .write_image_data(&data) .expect("png encoding failed"); } fn cmyk_to_rgb(input: &[u8]) -> Vec { let size = input.len() - input.len() / 4; let mut output = Vec::with_capacity(size); for pixel in input.chunks(4) { let c = pixel[0] as f32 / 255.0; let m = pixel[1] as f32 / 255.0; let y = pixel[2] as f32 / 255.0; let k = pixel[3] as f32 / 255.0; // CMYK -> CMY let c = c * (1.0 - k) + k; let m = m * (1.0 - k) + k; let y = y * (1.0 - k) + k; // CMY -> RGB let r = (1.0 - c) * 255.0; let g = (1.0 - m) * 255.0; let b = (1.0 - y) * 255.0; output.push(r as u8); output.push(g as u8); output.push(b as u8); } output } jpeg-decoder-0.1.22/src/decoder.rs010064400017500001750000001311151400431655600150550ustar 00000000000000use crate::read_u8; use error::{Error, Result, UnsupportedFeature}; use huffman::{fill_default_mjpeg_tables, HuffmanDecoder, HuffmanTable}; use marker::Marker; use parser::{AdobeColorTransform, AppData, CodingProcess, Component, Dimensions, EntropyCoding, FrameInfo, parse_app, parse_com, parse_dht, parse_dqt, parse_dri, parse_sof, parse_sos, IccChunk, ScanInfo}; use upsampler::Upsampler; use std::cmp; use std::io::Read; use std::mem; use std::ops::Range; use std::sync::Arc; use worker::{RowData, PlatformWorker, Worker}; pub const MAX_COMPONENTS: usize = 4; static UNZIGZAG: [u8; 64] = [ 0, 1, 8, 16, 9, 2, 3, 10, 17, 24, 32, 25, 18, 11, 4, 5, 12, 19, 26, 33, 40, 48, 41, 34, 27, 20, 13, 6, 7, 14, 21, 28, 35, 42, 49, 56, 57, 50, 43, 36, 29, 22, 15, 23, 30, 37, 44, 51, 58, 59, 52, 45, 38, 31, 39, 46, 53, 60, 61, 54, 47, 55, 62, 63, ]; /// An enumeration over combinations of color spaces and bit depths a pixel can have. #[derive(Clone, Copy, Debug, PartialEq)] pub enum PixelFormat { /// Luminance (grayscale), 8 bits L8, /// RGB, 8 bits per channel RGB24, /// CMYK, 8 bits per channel CMYK32, } impl PixelFormat { /// Determine the size in bytes of each pixel in this format pub fn pixel_bytes(&self) -> usize { match self { PixelFormat::L8 => 1, PixelFormat::RGB24 => 3, PixelFormat::CMYK32 => 4, } } } /// Represents metadata of an image. #[derive(Clone, Copy, Debug, PartialEq)] pub struct ImageInfo { /// The width of the image, in pixels. pub width: u16, /// The height of the image, in pixels. pub height: u16, /// The pixel format of the image. pub pixel_format: PixelFormat, } /// JPEG decoder pub struct Decoder { reader: R, frame: Option, dc_huffman_tables: Vec>, ac_huffman_tables: Vec>, quantization_tables: [Option>; 4], restart_interval: u16, color_transform: Option, is_jfif: bool, is_mjpeg: bool, icc_markers: Vec, // Used for progressive JPEGs. coefficients: Vec>, // Bitmask of which coefficients has been completely decoded. coefficients_finished: [u64; MAX_COMPONENTS], } impl Decoder { /// Creates a new `Decoder` using the reader `reader`. pub fn new(reader: R) -> Decoder { Decoder { reader: reader, frame: None, dc_huffman_tables: vec![None, None, None, None], ac_huffman_tables: vec![None, None, None, None], quantization_tables: [None, None, None, None], restart_interval: 0, color_transform: None, is_jfif: false, is_mjpeg: false, icc_markers: Vec::new(), coefficients: Vec::new(), coefficients_finished: [0; MAX_COMPONENTS], } } /// Returns metadata about the image. /// /// The returned value will be `None` until a call to either `read_info` or `decode` has /// returned `Ok`. pub fn info(&self) -> Option { match self.frame { Some(ref frame) => { let pixel_format = match frame.components.len() { 1 => PixelFormat::L8, 3 => PixelFormat::RGB24, 4 => PixelFormat::CMYK32, _ => panic!(), }; Some(ImageInfo { width: frame.output_size.width, height: frame.output_size.height, pixel_format: pixel_format, }) }, None => None, } } /// Returns the embeded icc profile if the image contains one. pub fn icc_profile(&self) -> Option> { let mut marker_present: [Option<&IccChunk>; 256] = [None; 256]; let num_markers = self.icc_markers.len(); if num_markers == 0 && num_markers < 256 { return None; } // check the validity of the markers for chunk in &self.icc_markers { if usize::from(chunk.num_markers) != num_markers { // all the lengths must match return None; } if chunk.seq_no == 0 { return None; } if marker_present[usize::from(chunk.seq_no)].is_some() { // duplicate seq_no return None; } else { marker_present[usize::from(chunk.seq_no)] = Some(chunk); } } // assemble them together by seq_no failing if any are missing let mut data = Vec::new(); // seq_no's start at 1 for &chunk in marker_present.get(1..=num_markers)? { data.extend_from_slice(&chunk?.data); } Some(data) } /// Tries to read metadata from the image without decoding it. /// /// If successful, the metadata can be obtained using the `info` method. pub fn read_info(&mut self) -> Result<()> { self.decode_internal(true).map(|_| ()) } /// Configure the decoder to scale the image during decoding. /// /// This efficiently scales the image by the smallest supported scale /// factor that produces an image larger than or equal to the requested /// size in at least one axis. The currently implemented scale factors /// are 1/8, 1/4, 1/2 and 1. /// /// To generate a thumbnail of an exact size, pass the desired size and /// then scale to the final size using a traditional resampling algorithm. pub fn scale(&mut self, requested_width: u16, requested_height: u16) -> Result<(u16, u16)> { self.read_info()?; let frame = self.frame.as_mut().unwrap(); let idct_size = crate::idct::choose_idct_size(frame.image_size, Dimensions{ width: requested_width, height: requested_height }); frame.update_idct_size(idct_size)?; Ok((frame.output_size.width, frame.output_size.height)) } /// Decodes the image and returns the decoded pixels if successful. pub fn decode(&mut self) -> Result> { self.decode_internal(false) } fn decode_internal(&mut self, stop_after_metadata: bool) -> Result> { if stop_after_metadata && self.frame.is_some() { // The metadata has already been read. return Ok(Vec::new()); } else if self.frame.is_none() && (read_u8(&mut self.reader)? != 0xFF || Marker::from_u8(read_u8(&mut self.reader)?) != Some(Marker::SOI)) { return Err(Error::Format("first two bytes are not an SOI marker".to_owned())); } let mut previous_marker = Marker::SOI; let mut pending_marker = None; let mut worker = None; let mut scans_processed = 0; let mut planes = vec![Vec::new(); self.frame.as_ref().map_or(0, |frame| frame.components.len())]; loop { let marker = match pending_marker.take() { Some(m) => m, None => self.read_marker()?, }; match marker { // Frame header Marker::SOF(..) => { // Section 4.10 // "An image contains only one frame in the cases of sequential and // progressive coding processes; an image contains multiple frames for the // hierarchical mode." if self.frame.is_some() { return Err(Error::Unsupported(UnsupportedFeature::Hierarchical)); } let frame = parse_sof(&mut self.reader, marker)?; let component_count = frame.components.len(); if frame.is_differential { return Err(Error::Unsupported(UnsupportedFeature::Hierarchical)); } if frame.coding_process == CodingProcess::Lossless { return Err(Error::Unsupported(UnsupportedFeature::Lossless)); } if frame.entropy_coding == EntropyCoding::Arithmetic { return Err(Error::Unsupported(UnsupportedFeature::ArithmeticEntropyCoding)); } if frame.precision != 8 { return Err(Error::Unsupported(UnsupportedFeature::SamplePrecision(frame.precision))); } if component_count != 1 && component_count != 3 && component_count != 4 { return Err(Error::Unsupported(UnsupportedFeature::ComponentCount(component_count as u8))); } // Make sure we support the subsampling ratios used. let _ = Upsampler::new(&frame.components, frame.image_size.width, frame.image_size.height)?; self.frame = Some(frame); if stop_after_metadata { return Ok(Vec::new()); } planes = vec![Vec::new(); component_count]; }, // Scan header Marker::SOS => { if self.frame.is_none() { return Err(Error::Format("scan encountered before frame".to_owned())); } if worker.is_none() { worker = Some(PlatformWorker::new()?); } let frame = self.frame.clone().unwrap(); let scan = parse_sos(&mut self.reader, &frame)?; if frame.coding_process == CodingProcess::DctProgressive && self.coefficients.is_empty() { self.coefficients = frame.components.iter().map(|c| { let block_count = c.block_size.width as usize * c.block_size.height as usize; vec![0; block_count * 64] }).collect(); } // This was previously buggy, so let's explain the log here a bit. When a // progressive frame is encoded then the coefficients (DC, AC) of each // component (=color plane) can be split amongst scans. In particular it can // happen or at least occurs in the wild that a scan contains coefficient 0 of // all components. If now one but not all components had all other coefficients // delivered in previous scans then such a scan contains all components but // completes only some of them! (This is technically NOT permitted for all // other coefficients as the standard dictates that scans with coefficients // other than the 0th must only contain ONE component so we would either // complete it or not. We may want to detect and error in case more component // are part of a scan than allowed.) What a weird edge case. // // But this means we track precisely which components get completed here. let mut finished = [false; MAX_COMPONENTS]; if scan.successive_approximation_low == 0 { for (&i, component_finished) in scan.component_indices.iter().zip(&mut finished) { if self.coefficients_finished[i] == !0 { continue; } for j in scan.spectral_selection.clone() { self.coefficients_finished[i] |= 1 << j; } if self.coefficients_finished[i] == !0 { *component_finished = true; } } } let (marker, data) = self.decode_scan(&frame, &scan, worker.as_mut().unwrap(), &finished)?; if let Some(data) = data { for (i, plane) in data.into_iter().enumerate().filter(|&(_, ref plane)| !plane.is_empty()) { if self.coefficients_finished[i] == !0 { planes[i] = plane; } } } pending_marker = marker; scans_processed += 1; }, // Table-specification and miscellaneous markers // Quantization table-specification Marker::DQT => { let tables = parse_dqt(&mut self.reader)?; for (i, &table) in tables.iter().enumerate() { if let Some(table) = table { let mut unzigzagged_table = [0u16; 64]; for j in 0 .. 64 { unzigzagged_table[UNZIGZAG[j] as usize] = table[j]; } self.quantization_tables[i] = Some(Arc::new(unzigzagged_table)); } } }, // Huffman table-specification Marker::DHT => { let is_baseline = self.frame.as_ref().map(|frame| frame.is_baseline); let (dc_tables, ac_tables) = parse_dht(&mut self.reader, is_baseline)?; let current_dc_tables = mem::replace(&mut self.dc_huffman_tables, vec![]); self.dc_huffman_tables = dc_tables.into_iter() .zip(current_dc_tables.into_iter()) .map(|(a, b)| a.or(b)) .collect(); let current_ac_tables = mem::replace(&mut self.ac_huffman_tables, vec![]); self.ac_huffman_tables = ac_tables.into_iter() .zip(current_ac_tables.into_iter()) .map(|(a, b)| a.or(b)) .collect(); }, // Arithmetic conditioning table-specification Marker::DAC => return Err(Error::Unsupported(UnsupportedFeature::ArithmeticEntropyCoding)), // Restart interval definition Marker::DRI => self.restart_interval = parse_dri(&mut self.reader)?, // Comment Marker::COM => { let _comment = parse_com(&mut self.reader)?; }, // Application data Marker::APP(..) => { if let Some(data) = parse_app(&mut self.reader, marker)? { match data { AppData::Adobe(color_transform) => self.color_transform = Some(color_transform), AppData::Jfif => { // From the JFIF spec: // "The APP0 marker is used to identify a JPEG FIF file. // The JPEG FIF APP0 marker is mandatory right after the SOI marker." // Some JPEGs in the wild does not follow this though, so we allow // JFIF headers anywhere APP0 markers are allowed. /* if previous_marker != Marker::SOI { return Err(Error::Format("the JFIF APP0 marker must come right after the SOI marker".to_owned())); } */ self.is_jfif = true; }, AppData::Avi1 => self.is_mjpeg = true, AppData::Icc(icc) => self.icc_markers.push(icc), } } }, // Restart Marker::RST(..) => { // Some encoders emit a final RST marker after entropy-coded data, which // decode_scan does not take care of. So if we encounter one, we ignore it. if previous_marker != Marker::SOS { return Err(Error::Format("RST found outside of entropy-coded data".to_owned())); } }, // Define number of lines Marker::DNL => { // Section B.2.1 // "If a DNL segment (see B.2.5) is present, it shall immediately follow the first scan." if previous_marker != Marker::SOS || scans_processed != 1 { return Err(Error::Format("DNL is only allowed immediately after the first scan".to_owned())); } return Err(Error::Unsupported(UnsupportedFeature::DNL)); }, // Hierarchical mode markers Marker::DHP | Marker::EXP => return Err(Error::Unsupported(UnsupportedFeature::Hierarchical)), // End of image Marker::EOI => break, _ => return Err(Error::Format(format!("{:?} marker found where not allowed", marker))), } previous_marker = marker; } if self.frame.is_none() { return Err(Error::Format("end of image encountered before frame".to_owned())); } let frame = self.frame.as_ref().unwrap(); // If we're decoding a progressive jpeg and a component is unfinished, render what we've got if frame.coding_process == CodingProcess::DctProgressive && self.coefficients.len() == frame.components.len() { for (i, component) in frame.components.iter().enumerate() { // Only dealing with unfinished components if self.coefficients_finished[i] == !0 { continue; } let quantization_table = match self.quantization_tables[component.quantization_table_index].clone() { Some(quantization_table) => quantization_table, None => continue, }; // Get the worker prepared if worker.is_none() { worker = Some(PlatformWorker::new()?); } let worker = worker.as_mut().unwrap(); let row_data = RowData { index: i, component: component.clone(), quantization_table, }; worker.start(row_data)?; // Send the rows over to the worker and collect the result let coefficients_per_mcu_row = usize::from(component.block_size.width) * usize::from(component.vertical_sampling_factor) * 64; for mcu_y in 0..frame.mcu_size.height { let row_coefficients = { let offset = usize::from(mcu_y) * coefficients_per_mcu_row; self.coefficients[i][offset .. offset + coefficients_per_mcu_row].to_vec() }; worker.append_row((i, row_coefficients))?; } planes[i] = worker.get_result(i)?; } } compute_image(&frame.components, planes, frame.output_size, self.is_jfif, self.color_transform) } fn read_marker(&mut self) -> Result { loop { // This should be an error as the JPEG spec doesn't allow extraneous data between marker segments. // libjpeg allows this though and there are images in the wild utilising it, so we are // forced to support this behavior. // Sony Ericsson P990i is an example of a device which produce this sort of JPEGs. while read_u8(&mut self.reader)? != 0xFF {} // Section B.1.1.2 // All markers are assigned two-byte codes: an X’FF’ byte followed by a // byte which is not equal to 0 or X’FF’ (see Table B.1). Any marker may // optionally be preceded by any number of fill bytes, which are bytes // assigned code X’FF’. let mut byte = read_u8(&mut self.reader)?; // Section B.1.1.2 // "Any marker may optionally be preceded by any number of fill bytes, which are bytes assigned code X’FF’." while byte == 0xFF { byte = read_u8(&mut self.reader)?; } if byte != 0x00 && byte != 0xFF { return Ok(Marker::from_u8(byte).unwrap()); } } } fn decode_scan(&mut self, frame: &FrameInfo, scan: &ScanInfo, worker: &mut PlatformWorker, finished: &[bool; MAX_COMPONENTS]) -> Result<(Option, Option>>)> { assert!(scan.component_indices.len() <= MAX_COMPONENTS); let components: Vec = scan.component_indices.iter() .map(|&i| frame.components[i].clone()) .collect(); // Verify that all required quantization tables has been set. if components.iter().any(|component| self.quantization_tables[component.quantization_table_index].is_none()) { return Err(Error::Format("use of unset quantization table".to_owned())); } if self.is_mjpeg { fill_default_mjpeg_tables(scan, &mut self.dc_huffman_tables, &mut self.ac_huffman_tables); } // Verify that all required huffman tables has been set. if scan.spectral_selection.start == 0 && scan.dc_table_indices.iter().any(|&i| self.dc_huffman_tables[i].is_none()) { return Err(Error::Format("scan makes use of unset dc huffman table".to_owned())); } if scan.spectral_selection.end > 1 && scan.ac_table_indices.iter().any(|&i| self.ac_huffman_tables[i].is_none()) { return Err(Error::Format("scan makes use of unset ac huffman table".to_owned())); } // Prepare the worker thread for the work to come. for (i, component) in components.iter().enumerate() { if finished[i] { let row_data = RowData { index: i, component: component.clone(), quantization_table: self.quantization_tables[component.quantization_table_index].clone().unwrap(), }; worker.start(row_data)?; } } let is_progressive = frame.coding_process == CodingProcess::DctProgressive; let is_interleaved = components.len() > 1; let mut dummy_block = [0i16; 64]; let mut huffman = HuffmanDecoder::new(); let mut dc_predictors = [0i16; MAX_COMPONENTS]; let mut mcus_left_until_restart = self.restart_interval; let mut expected_rst_num = 0; let mut eob_run = 0; let mut mcu_row_coefficients = Vec::with_capacity(components.len()); if !is_progressive { for (_, component) in components.iter().enumerate().filter(|&(i, _)| finished[i]) { let coefficients_per_mcu_row = component.block_size.width as usize * component.vertical_sampling_factor as usize * 64; mcu_row_coefficients.push(vec![0i16; coefficients_per_mcu_row]); } } // 4.8.2 // When reading from the stream, if the data is non-interleaved then an MCU consists of // exactly one block (effectively a 1x1 sample). let (mcu_horizontal_samples, mcu_vertical_samples) = if is_interleaved { let horizontal = components.iter().map(|component| component.horizontal_sampling_factor as u16).collect::>(); let vertical = components.iter().map(|component| component.vertical_sampling_factor as u16).collect::>(); (horizontal, vertical) } else { (vec![1], vec![1]) }; // This also affects how many MCU values we read from stream. If it's a non-interleaved stream, // the MCUs will be exactly the block count. let (max_mcu_x, max_mcu_y) = if is_interleaved { (frame.mcu_size.width, frame.mcu_size.height) } else { (components[0].block_size.width, components[0].block_size.height) }; for mcu_y in 0..max_mcu_y { if mcu_y * 8 >= frame.image_size.height { break; } for mcu_x in 0..max_mcu_x { if mcu_x * 8 >= frame.image_size.width { break; } if self.restart_interval > 0 { if mcus_left_until_restart == 0 { match huffman.take_marker(&mut self.reader)? { Some(Marker::RST(n)) => { if n != expected_rst_num { return Err(Error::Format(format!("found RST{} where RST{} was expected", n, expected_rst_num))); } huffman.reset(); // Section F.2.1.3.1 dc_predictors = [0i16; MAX_COMPONENTS]; // Section G.1.2.2 eob_run = 0; expected_rst_num = (expected_rst_num + 1) % 8; mcus_left_until_restart = self.restart_interval; }, Some(marker) => return Err(Error::Format(format!("found marker {:?} inside scan where RST{} was expected", marker, expected_rst_num))), None => return Err(Error::Format(format!("no marker found where RST{} was expected", expected_rst_num))), } } mcus_left_until_restart -= 1; } for (i, component) in components.iter().enumerate() { for v_pos in 0..mcu_vertical_samples[i] { for h_pos in 0..mcu_horizontal_samples[i] { let coefficients = if is_progressive { let block_y = (mcu_y * mcu_vertical_samples[i] + v_pos) as usize; let block_x = (mcu_x * mcu_horizontal_samples[i] + h_pos) as usize; let block_offset = (block_y * component.block_size.width as usize + block_x) * 64; &mut self.coefficients[scan.component_indices[i]][block_offset..block_offset + 64] } else if finished[i] { // Because the worker thread operates in batches as if we were always interleaved, we // need to distinguish between a single-shot buffer and one that's currently in process // (for a non-interleaved) stream let mcu_batch_current_row = if is_interleaved { 0 } else { mcu_y % component.vertical_sampling_factor as u16 }; let block_y = (mcu_batch_current_row * mcu_vertical_samples[i] + v_pos) as usize; let block_x = (mcu_x * mcu_horizontal_samples[i] + h_pos) as usize; let block_offset = (block_y * component.block_size.width as usize + block_x) * 64; &mut mcu_row_coefficients[i][block_offset..block_offset + 64] } else { &mut dummy_block[..] }; if scan.successive_approximation_high == 0 { decode_block(&mut self.reader, coefficients, &mut huffman, self.dc_huffman_tables[scan.dc_table_indices[i]].as_ref(), self.ac_huffman_tables[scan.ac_table_indices[i]].as_ref(), scan.spectral_selection.clone(), scan.successive_approximation_low, &mut eob_run, &mut dc_predictors[i])?; } else { decode_block_successive_approximation(&mut self.reader, coefficients, &mut huffman, self.ac_huffman_tables[scan.ac_table_indices[i]].as_ref(), scan.spectral_selection.clone(), scan.successive_approximation_low, &mut eob_run)?; } } } } } // Send the coefficients from this MCU row to the worker thread for dequantization and idct. for (i, component) in components.iter().enumerate() { if finished[i] { // In the event of non-interleaved streams, if we're still building the buffer out, // keep going; don't send it yet. We also need to ensure we don't skip over the last // row(s) of the image. if !is_interleaved && (mcu_y + 1) * 8 < frame.image_size.height { if (mcu_y + 1) % component.vertical_sampling_factor as u16 > 0 { continue; } } let coefficients_per_mcu_row = component.block_size.width as usize * component.vertical_sampling_factor as usize * 64; let row_coefficients = if is_progressive { // Because non-interleaved streams will have multiple MCU rows concatenated together, // the row for calculating the offset is different. let worker_mcu_y = if is_interleaved { mcu_y } else { // Explicitly doing floor-division here mcu_y / component.vertical_sampling_factor as u16 }; let offset = worker_mcu_y as usize * coefficients_per_mcu_row; self.coefficients[scan.component_indices[i]][offset .. offset + coefficients_per_mcu_row].to_vec() } else { mem::replace(&mut mcu_row_coefficients[i], vec![0i16; coefficients_per_mcu_row]) }; worker.append_row((i, row_coefficients))?; } } } let mut marker = huffman.take_marker(&mut self.reader)?; while let Some(Marker::RST(_)) = marker { marker = self.read_marker().ok(); } if finished.iter().any(|&c| c) { // Retrieve all the data from the worker thread. let mut data = vec![Vec::new(); frame.components.len()]; for (i, &component_index) in scan.component_indices.iter().enumerate() { if finished[i] { data[component_index] = worker.get_result(i)?; } } Ok((marker, Some(data))) } else { Ok((marker, None)) } } } fn decode_block(reader: &mut R, coefficients: &mut [i16], huffman: &mut HuffmanDecoder, dc_table: Option<&HuffmanTable>, ac_table: Option<&HuffmanTable>, spectral_selection: Range, successive_approximation_low: u8, eob_run: &mut u16, dc_predictor: &mut i16) -> Result<()> { debug_assert_eq!(coefficients.len(), 64); if spectral_selection.start == 0 { // Section F.2.2.1 // Figure F.12 let value = huffman.decode(reader, dc_table.unwrap())?; let diff = match value { 0 => 0, 1..=11 => huffman.receive_extend(reader, value)?, _ => { // Section F.1.2.1.1 // Table F.1 return Err(Error::Format("invalid DC difference magnitude category".to_owned())); }, }; // Malicious JPEG files can cause this add to overflow, therefore we use wrapping_add. // One example of such a file is tests/crashtest/images/dc-predictor-overflow.jpg *dc_predictor = dc_predictor.wrapping_add(diff); coefficients[0] = *dc_predictor << successive_approximation_low; } let mut index = cmp::max(spectral_selection.start, 1); if index < spectral_selection.end && *eob_run > 0 { *eob_run -= 1; return Ok(()); } // Section F.1.2.2.1 while index < spectral_selection.end { if let Some((value, run)) = huffman.decode_fast_ac(reader, ac_table.unwrap())? { index += run; if index >= spectral_selection.end { break; } coefficients[UNZIGZAG[index as usize] as usize] = value << successive_approximation_low; index += 1; } else { let byte = huffman.decode(reader, ac_table.unwrap())?; let r = byte >> 4; let s = byte & 0x0f; if s == 0 { match r { 15 => index += 16, // Run length of 16 zero coefficients. _ => { *eob_run = (1 << r) - 1; if r > 0 { *eob_run += huffman.get_bits(reader, r)?; } break; }, } } else { index += r; if index >= spectral_selection.end { break; } coefficients[UNZIGZAG[index as usize] as usize] = huffman.receive_extend(reader, s)? << successive_approximation_low; index += 1; } } } Ok(()) } fn decode_block_successive_approximation(reader: &mut R, coefficients: &mut [i16], huffman: &mut HuffmanDecoder, ac_table: Option<&HuffmanTable>, spectral_selection: Range, successive_approximation_low: u8, eob_run: &mut u16) -> Result<()> { debug_assert_eq!(coefficients.len(), 64); let bit = 1 << successive_approximation_low; if spectral_selection.start == 0 { // Section G.1.2.1 if huffman.get_bits(reader, 1)? == 1 { coefficients[0] |= bit; } } else { // Section G.1.2.3 if *eob_run > 0 { *eob_run -= 1; refine_non_zeroes(reader, coefficients, huffman, spectral_selection, 64, bit)?; return Ok(()); } let mut index = spectral_selection.start; while index < spectral_selection.end { let byte = huffman.decode(reader, ac_table.unwrap())?; let r = byte >> 4; let s = byte & 0x0f; let mut zero_run_length = r; let mut value = 0; match s { 0 => { match r { 15 => { // Run length of 16 zero coefficients. // We don't need to do anything special here, zero_run_length is 15 // and then value (which is zero) gets written, resulting in 16 // zero coefficients. }, _ => { *eob_run = (1 << r) - 1; if r > 0 { *eob_run += huffman.get_bits(reader, r)?; } // Force end of block. zero_run_length = 64; }, } }, 1 => { if huffman.get_bits(reader, 1)? == 1 { value = bit; } else { value = -bit; } }, _ => return Err(Error::Format("unexpected huffman code".to_owned())), } let range = Range { start: index, end: spectral_selection.end, }; index = refine_non_zeroes(reader, coefficients, huffman, range, zero_run_length, bit)?; if value != 0 { coefficients[UNZIGZAG[index as usize] as usize] = value; } index += 1; } } Ok(()) } fn refine_non_zeroes(reader: &mut R, coefficients: &mut [i16], huffman: &mut HuffmanDecoder, range: Range, zrl: u8, bit: i16) -> Result { debug_assert_eq!(coefficients.len(), 64); let last = range.end - 1; let mut zero_run_length = zrl; for i in range { let index = UNZIGZAG[i as usize] as usize; if coefficients[index] == 0 { if zero_run_length == 0 { return Ok(i); } zero_run_length -= 1; } else if huffman.get_bits(reader, 1)? == 1 && coefficients[index] & bit == 0 { if coefficients[index] > 0 { coefficients[index] += bit; } else { coefficients[index] -= bit; } } } Ok(last) } fn compute_image(components: &[Component], mut data: Vec>, output_size: Dimensions, is_jfif: bool, color_transform: Option) -> Result> { if data.is_empty() || data.iter().any(Vec::is_empty) { return Err(Error::Format("not all components have data".to_owned())); } if components.len() == 1 { let component = &components[0]; let mut decoded: Vec = data.remove(0); let width = component.size.width as usize; let height = component.size.height as usize; let size = width * height; let line_stride = component.block_size.width as usize * component.dct_scale; // if the image width is a multiple of the block size, // then we don't have to move bytes in the decoded data if usize::from(output_size.width) != line_stride { let mut buffer = vec![0u8; width]; // The first line already starts at index 0, so we need to move only lines 1..height for y in 1..height { let destination_idx = y * width; let source_idx = y * line_stride; // We could use copy_within, but we need to support old rust versions buffer.copy_from_slice(&decoded[source_idx..][..width]); let destination = &mut decoded[destination_idx..][..width]; destination.copy_from_slice(&buffer); } } decoded.resize(size, 0); Ok(decoded) } else { compute_image_parallel(components, data, output_size, is_jfif, color_transform) } } #[cfg(feature="rayon")] fn compute_image_parallel(components: &[Component], data: Vec>, output_size: Dimensions, is_jfif: bool, color_transform: Option) -> Result> { use rayon::prelude::*; let color_convert_func = choose_color_convert_func(components.len(), is_jfif, color_transform)?; let upsampler = Upsampler::new(components, output_size.width, output_size.height)?; let line_size = output_size.width as usize * components.len(); let mut image = vec![0u8; line_size * output_size.height as usize]; image.par_chunks_mut(line_size) .with_max_len(1) .enumerate() .for_each(|(row, line)| { upsampler.upsample_and_interleave_row(&data, row, output_size.width as usize, line); color_convert_func(line); }); Ok(image) } #[cfg(not(feature="rayon"))] fn compute_image_parallel(components: &[Component], data: Vec>, output_size: Dimensions, is_jfif: bool, color_transform: Option) -> Result> { let color_convert_func = choose_color_convert_func(components.len(), is_jfif, color_transform)?; let upsampler = Upsampler::new(components, output_size.width, output_size.height)?; let line_size = output_size.width as usize * components.len(); let mut image = vec![0u8; line_size * output_size.height as usize]; for (row, line) in image.chunks_mut(line_size) .enumerate() { upsampler.upsample_and_interleave_row(&data, row, output_size.width as usize, line); color_convert_func(line); } Ok(image) } fn choose_color_convert_func(component_count: usize, _is_jfif: bool, color_transform: Option) -> Result { match component_count { 3 => { // http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/JPEG.html#Adobe // Unknown means the data is RGB, so we don't need to perform any color conversion on it. if color_transform == Some(AdobeColorTransform::Unknown) { Ok(color_convert_line_null) } else { Ok(color_convert_line_ycbcr) } }, 4 => { // http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/JPEG.html#Adobe match color_transform { Some(AdobeColorTransform::Unknown) => Ok(color_convert_line_cmyk), Some(_) => Ok(color_convert_line_ycck), None => Err(Error::Format("4 components without Adobe APP14 metadata to indicate color space".to_owned())), } }, _ => panic!(), } } fn color_convert_line_null(_data: &mut [u8]) { } fn color_convert_line_ycbcr(data: &mut [u8]) { for chunk in data.chunks_exact_mut(3) { let (r, g, b) = ycbcr_to_rgb(chunk[0], chunk[1], chunk[2]); chunk[0] = r; chunk[1] = g; chunk[2] = b; } } fn color_convert_line_ycck(data: &mut [u8]) { for chunk in data.chunks_exact_mut(4) { let (r, g, b) = ycbcr_to_rgb(chunk[0], chunk[1], chunk[2]); let k = chunk[3]; chunk[0] = r; chunk[1] = g; chunk[2] = b; chunk[3] = 255 - k; } } fn color_convert_line_cmyk(data: &mut [u8]) { for chunk in data.chunks_exact_mut(4) { chunk[0] = 255 - chunk[0]; chunk[1] = 255 - chunk[1]; chunk[2] = 255 - chunk[2]; chunk[3] = 255 - chunk[3]; } } // ITU-R BT.601 fn ycbcr_to_rgb(y: u8, cb: u8, cr: u8) -> (u8, u8, u8) { let y = y as f32; let cb = cb as f32 - 128.0; let cr = cr as f32 - 128.0; let r = y + 1.40200 * cr; let g = y - 0.34414 * cb - 0.71414 * cr; let b = y + 1.77200 * cb; // TODO: Rust has defined float-to-int conversion as saturating, // which is exactly what we need here. However, as of this writing // it still hasn't reached the stable channel. // This can be simplified to `(r + 0.5) as u8` without any clamping // as soon as our MSRV reaches the version that has saturating casts. // The version without explicit clamping is also noticeably faster. (clamp_to_u8((r + 0.5) as i32) as u8, clamp_to_u8((g + 0.5) as i32) as u8, clamp_to_u8((b + 0.5) as i32) as u8) } fn clamp_to_u8(value: i32) -> i32 { let value = std::cmp::max(value, 0); std::cmp::min(value, 255) } jpeg-decoder-0.1.22/src/error.rs010064400017500001750000000046641367174505600146230ustar 00000000000000use std::error::Error as StdError; use std::fmt; use std::io::Error as IoError; pub type Result = ::std::result::Result; /// An enumeration over JPEG features (currently) unsupported by this library. /// /// Support for features listed here may be included in future versions of this library. #[derive(Debug)] pub enum UnsupportedFeature { /// Hierarchical JPEG. Hierarchical, /// Lossless JPEG. Lossless, /// JPEG using arithmetic entropy coding instead of Huffman coding. ArithmeticEntropyCoding, /// Sample precision in bits. 8 bit sample precision is what is currently supported. SamplePrecision(u8), /// Number of components in an image. 1, 3 and 4 components are currently supported. ComponentCount(u8), /// An image can specify a zero height in the frame header and use the DNL (Define Number of /// Lines) marker at the end of the first scan to define the number of lines in the frame. DNL, /// Subsampling ratio. SubsamplingRatio, /// A subsampling ratio not representable as an integer. NonIntegerSubsamplingRatio, } /// Errors that can occur while decoding a JPEG image. #[derive(Debug)] pub enum Error { /// The image is not formatted properly. The string contains detailed information about the /// error. Format(String), /// The image makes use of a JPEG feature not (currently) supported by this library. Unsupported(UnsupportedFeature), /// An I/O error occurred while decoding the image. Io(IoError), /// An internal error occurred while decoding the image. Internal(Box), //TODO: not used, can be removed with the next version bump } impl fmt::Display for Error { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { match *self { Error::Format(ref desc) => write!(f, "invalid JPEG format: {}", desc), Error::Unsupported(ref feat) => write!(f, "unsupported JPEG feature: {:?}", feat), Error::Io(ref err) => err.fmt(f), Error::Internal(ref err) => err.fmt(f), } } } impl StdError for Error { fn source(&self) -> Option<&(dyn StdError + 'static)> { match *self { Error::Io(ref err) => Some(err), Error::Internal(ref err) => Some(&**err), _ => None, } } } impl From for Error { fn from(err: IoError) -> Error { Error::Io(err) } } jpeg-decoder-0.1.22/src/huffman.rs010064400017500001750000000307641400303361400150720ustar 00000000000000use crate::read_u8; use error::{Error, Result}; use marker::Marker; use parser::ScanInfo; use std::io::Read; const LUT_BITS: u8 = 8; #[derive(Debug)] pub struct HuffmanDecoder { bits: u64, num_bits: u8, marker: Option, } impl HuffmanDecoder { pub fn new() -> HuffmanDecoder { HuffmanDecoder { bits: 0, num_bits: 0, marker: None, } } // Section F.2.2.3 // Figure F.16 pub fn decode(&mut self, reader: &mut R, table: &HuffmanTable) -> Result { if self.num_bits < 16 { self.read_bits(reader)?; } let (value, size) = table.lut[self.peek_bits(LUT_BITS) as usize]; if size > 0 { self.consume_bits(size); Ok(value) } else { let bits = self.peek_bits(16); for i in LUT_BITS .. 16 { let code = (bits >> (15 - i)) as i32; if code <= table.maxcode[i as usize] { self.consume_bits(i + 1); let index = (code + table.delta[i as usize]) as usize; return Ok(table.values[index]); } } Err(Error::Format("failed to decode huffman code".to_owned())) } } pub fn decode_fast_ac(&mut self, reader: &mut R, table: &HuffmanTable) -> Result> { if let Some(ref ac_lut) = table.ac_lut { if self.num_bits < LUT_BITS { self.read_bits(reader)?; } let (value, run_size) = ac_lut[self.peek_bits(LUT_BITS) as usize]; if run_size != 0 { let run = run_size >> 4; let size = run_size & 0x0f; self.consume_bits(size); return Ok(Some((value, run))); } } Ok(None) } #[inline] pub fn get_bits(&mut self, reader: &mut R, count: u8) -> Result { if self.num_bits < count { self.read_bits(reader)?; } let bits = self.peek_bits(count); self.consume_bits(count); Ok(bits) } #[inline] pub fn receive_extend(&mut self, reader: &mut R, count: u8) -> Result { let value = self.get_bits(reader, count)?; Ok(extend(value, count)) } pub fn reset(&mut self) { self.bits = 0; self.num_bits = 0; } pub fn take_marker(&mut self, reader: &mut R) -> Result> { self.read_bits(reader).map(|_| self.marker.take()) } #[inline] fn peek_bits(&mut self, count: u8) -> u16 { debug_assert!(count <= 16); debug_assert!(self.num_bits >= count); ((self.bits >> (64 - count)) & ((1 << count) - 1)) as u16 } #[inline] fn consume_bits(&mut self, count: u8) { debug_assert!(self.num_bits >= count); self.bits <<= count as usize; self.num_bits -= count; } fn read_bits(&mut self, reader: &mut R) -> Result<()> { while self.num_bits <= 56 { // Fill with zero bits if we have reached the end. let byte = match self.marker { Some(_) => 0, None => read_u8(reader)?, }; if byte == 0xFF { let mut next_byte = read_u8(reader)?; // Check for byte stuffing. if next_byte != 0x00 { // We seem to have reached the end of entropy-coded data and encountered a // marker. Since we can't put data back into the reader, we have to continue // reading to identify the marker so we can pass it on. // Section B.1.1.2 // "Any marker may optionally be preceded by any number of fill bytes, which are bytes assigned code X’FF’." while next_byte == 0xFF { next_byte = read_u8(reader)?; } match next_byte { 0x00 => return Err(Error::Format("FF 00 found where marker was expected".to_owned())), _ => self.marker = Some(Marker::from_u8(next_byte).unwrap()), } continue; } } self.bits |= (byte as u64) << (56 - self.num_bits); self.num_bits += 8; } Ok(()) } } // Section F.2.2.1 // Figure F.12 fn extend(value: u16, count: u8) -> i16 { let vt = 1 << (count as u16 - 1); if value < vt { value as i16 + (-1 << count as i16) + 1 } else { value as i16 } } #[derive(Clone, Copy, Debug, PartialEq)] pub enum HuffmanTableClass { DC, AC, } pub struct HuffmanTable { values: Vec, delta: [i32; 16], maxcode: [i32; 16], lut: [(u8, u8); 1 << LUT_BITS], ac_lut: Option<[(i16, u8); 1 << LUT_BITS]>, } impl HuffmanTable { pub fn new(bits: &[u8; 16], values: &[u8], class: HuffmanTableClass) -> Result { let (huffcode, huffsize) = derive_huffman_codes(bits)?; // Section F.2.2.3 // Figure F.15 // delta[i] is set to VALPTR(I) - MINCODE(I) let mut delta = [0i32; 16]; let mut maxcode = [-1i32; 16]; let mut j = 0; for i in 0 .. 16 { if bits[i] != 0 { delta[i] = j as i32 - huffcode[j] as i32; j += bits[i] as usize; maxcode[i] = huffcode[j - 1] as i32; } } // Build a lookup table for faster decoding. let mut lut = [(0u8, 0u8); 1 << LUT_BITS]; for (i, &size) in huffsize.iter().enumerate().filter(|&(_, &size)| size <= LUT_BITS) { let bits_remaining = LUT_BITS - size; let start = (huffcode[i] << bits_remaining) as usize; for j in 0 .. 1 << bits_remaining { lut[start + j] = (values[i], size); } } // Build a lookup table for small AC coefficients which both decodes the value and does the // equivalent of receive_extend. let ac_lut = match class { HuffmanTableClass::DC => None, HuffmanTableClass::AC => { let mut table = [(0i16, 0u8); 1 << LUT_BITS]; for (i, &(value, size)) in lut.iter().enumerate() { let run_length = value >> 4; let magnitude_category = value & 0x0f; if magnitude_category > 0 && size + magnitude_category <= LUT_BITS { let unextended_ac_value = (((i << size) & ((1 << LUT_BITS) - 1)) >> (LUT_BITS - magnitude_category)) as u16; let ac_value = extend(unextended_ac_value, magnitude_category); table[i] = (ac_value, (run_length << 4) | (size + magnitude_category)); } } Some(table) }, }; Ok(HuffmanTable { values: values.to_vec(), delta: delta, maxcode: maxcode, lut: lut, ac_lut: ac_lut, }) } } // Section C.2 fn derive_huffman_codes(bits: &[u8; 16]) -> Result<(Vec, Vec)> { // Figure C.1 let huffsize = bits.iter() .enumerate() .fold(Vec::new(), |mut acc, (i, &value)| { acc.extend(std::iter::repeat((i + 1) as u8).take(value as usize)); acc }); // Figure C.2 let mut huffcode = vec![0u16; huffsize.len()]; let mut code_size = huffsize[0]; let mut code = 0u32; for (i, &size) in huffsize.iter().enumerate() { while code_size < size { code <<= 1; code_size += 1; } if code >= (1u32 << size) { return Err(Error::Format("bad huffman code length".to_owned())); } huffcode[i] = code as u16; code += 1; } Ok((huffcode, huffsize)) } // https://www.loc.gov/preservation/digital/formats/fdd/fdd000063.shtml // "Avery Lee, writing in the rec.video.desktop newsgroup in 2001, commented that "MJPEG, or at // least the MJPEG in AVIs having the MJPG fourcc, is restricted JPEG with a fixed -- and // *omitted* -- Huffman table. The JPEG must be YCbCr colorspace, it must be 4:2:2, and it must // use basic Huffman encoding, not arithmetic or progressive.... You can indeed extract the // MJPEG frames and decode them with a regular JPEG decoder, but you have to prepend the DHT // segment to them, or else the decoder won't have any idea how to decompress the data. // The exact table necessary is given in the OpenDML spec."" pub fn fill_default_mjpeg_tables(scan: &ScanInfo, dc_huffman_tables: &mut[Option], ac_huffman_tables: &mut[Option]) { // Section K.3.3 if dc_huffman_tables[0].is_none() && scan.dc_table_indices.iter().any(|&i| i == 0) { // Table K.3 dc_huffman_tables[0] = Some(HuffmanTable::new( &[0x00, 0x01, 0x05, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00], &[0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B], HuffmanTableClass::DC).unwrap()); } if dc_huffman_tables[1].is_none() && scan.dc_table_indices.iter().any(|&i| i == 1) { // Table K.4 dc_huffman_tables[1] = Some(HuffmanTable::new( &[0x00, 0x03, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00], &[0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B], HuffmanTableClass::DC).unwrap()); } if ac_huffman_tables[0].is_none() && scan.ac_table_indices.iter().any(|&i| i == 0) { // Table K.5 ac_huffman_tables[0] = Some(HuffmanTable::new( &[0x00, 0x02, 0x01, 0x03, 0x03, 0x02, 0x04, 0x03, 0x05, 0x05, 0x04, 0x04, 0x00, 0x00, 0x01, 0x7D], &[0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12, 0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07, 0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xA1, 0x08, 0x23, 0x42, 0xB1, 0xC1, 0x15, 0x52, 0xD1, 0xF0, 0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0A, 0x16, 0x17, 0x18, 0x19, 0x1A, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4A, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6A, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8A, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9A, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8, 0xA9, 0xAA, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6, 0xB7, 0xB8, 0xB9, 0xBA, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, 0xCA, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xEA, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8, 0xF9, 0xFA ], HuffmanTableClass::AC).unwrap()); } if ac_huffman_tables[1].is_none() && scan.ac_table_indices.iter().any(|&i| i == 1) { // Table K.6 ac_huffman_tables[1] = Some(HuffmanTable::new( &[0x00, 0x02, 0x01, 0x02, 0x04, 0x04, 0x03, 0x04, 0x07, 0x05, 0x04, 0x04, 0x00, 0x01, 0x02, 0x77], &[0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21, 0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71, 0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91, 0xA1, 0xB1, 0xC1, 0x09, 0x23, 0x33, 0x52, 0xF0, 0x15, 0x62, 0x72, 0xD1, 0x0A, 0x16, 0x24, 0x34, 0xE1, 0x25, 0xF1, 0x17, 0x18, 0x19, 0x1A, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4A, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6A, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8A, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9A, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8, 0xA9, 0xAA, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6, 0xB7, 0xB8, 0xB9, 0xBA, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, 0xCA, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xEA, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8, 0xF9, 0xFA ], HuffmanTableClass::AC).unwrap()); } } jpeg-decoder-0.1.22/src/idct.rs010064400017500001750000000376261400057706300144050ustar 00000000000000// Malicious JPEG files can cause operations in the idct to overflow. // One example is tests/crashtest/images/imagetestsuite/b0b8914cc5f7a6eff409f16d8cc236c5.jpg // That's why wrapping operators are needed. use crate::parser::Dimensions; use std::{convert::TryFrom, num::Wrapping}; pub(crate) fn choose_idct_size(full_size: Dimensions, requested_size: Dimensions) -> usize { fn scaled(len: u16, scale: usize) -> u16 { ((len as u32 * scale as u32 - 1) / 8 + 1) as u16 } for &scale in &[1, 2, 4] { if scaled(full_size.width, scale) >= requested_size.width || scaled(full_size.height, scale) >= requested_size.height { return scale; } } 8 } #[test] fn test_choose_idct_size() { assert_eq!(choose_idct_size(Dimensions{width: 5472, height: 3648}, Dimensions{width: 200, height: 200}), 1); assert_eq!(choose_idct_size(Dimensions{width: 5472, height: 3648}, Dimensions{width: 500, height: 500}), 1); assert_eq!(choose_idct_size(Dimensions{width: 5472, height: 3648}, Dimensions{width: 684, height: 456}), 1); assert_eq!(choose_idct_size(Dimensions{width: 5472, height: 3648}, Dimensions{width: 999, height: 456}), 1); assert_eq!(choose_idct_size(Dimensions{width: 5472, height: 3648}, Dimensions{width: 684, height: 999}), 1); assert_eq!(choose_idct_size(Dimensions{width: 500, height: 333}, Dimensions{width: 63, height: 42}), 1); assert_eq!(choose_idct_size(Dimensions{width: 5472, height: 3648}, Dimensions{width: 685, height: 999}), 2); assert_eq!(choose_idct_size(Dimensions{width: 5472, height: 3648}, Dimensions{width: 1000, height: 1000}), 2); assert_eq!(choose_idct_size(Dimensions{width: 5472, height: 3648}, Dimensions{width: 1400, height: 1400}), 4); assert_eq!(choose_idct_size(Dimensions{width: 5472, height: 3648}, Dimensions{width: 5472, height: 3648}), 8); assert_eq!(choose_idct_size(Dimensions{width: 5472, height: 3648}, Dimensions{width: 16384, height: 16384}), 8); assert_eq!(choose_idct_size(Dimensions{width: 1, height: 1}, Dimensions{width: 65535, height: 65535}), 8); assert_eq!(choose_idct_size(Dimensions{width: 5472, height: 3648}, Dimensions{width: 16384, height: 16384}), 8); } pub(crate) fn dequantize_and_idct_block(scale: usize, coefficients: &[i16], quantization_table: &[u16; 64], output_linestride: usize, output: &mut [u8]) { match scale { 8 => dequantize_and_idct_block_8x8(coefficients, quantization_table, output_linestride, output), 4 => dequantize_and_idct_block_4x4(coefficients, quantization_table, output_linestride, output), 2 => dequantize_and_idct_block_2x2(coefficients, quantization_table, output_linestride, output), 1 => dequantize_and_idct_block_1x1(coefficients, quantization_table, output_linestride, output), _ => panic!("Unsupported IDCT scale {}/8", scale), } } pub fn dequantize_and_idct_block_8x8( coefficients: &[i16], quantization_table: &[u16; 64], output_linestride: usize, output: &mut [u8] ) { let output = output .chunks_mut(output_linestride); dequantize_and_idct_block_8x8_inner(coefficients, quantization_table, output) } // This is based on stb_image's 'stbi__idct_block'. fn dequantize_and_idct_block_8x8_inner<'a, I>( coefficients: &[i16], quantization_table: &[u16; 64], output: I, ) where I: IntoIterator, I::IntoIter: ExactSizeIterator, { let output = output.into_iter(); debug_assert!( output.len() >= 8, "Output iterator has the wrong length: {}", output.len() ); // optimizer hint to eliminate bounds checks within loops assert!(coefficients.len() == 64); let mut temp = [Wrapping(0); 64]; // columns for i in 0..8 { if coefficients[i + 8] == 0 && coefficients[i + 16] == 0 && coefficients[i + 24] == 0 && coefficients[i + 32] == 0 && coefficients[i + 40] == 0 && coefficients[i + 48] == 0 && coefficients[i + 56] == 0 { let dcterm = dequantize(coefficients[i], quantization_table[i]) << 2; temp[i] = dcterm; temp[i + 8] = dcterm; temp[i + 16] = dcterm; temp[i + 24] = dcterm; temp[i + 32] = dcterm; temp[i + 40] = dcterm; temp[i + 48] = dcterm; temp[i + 56] = dcterm; } else { let s0 = dequantize(coefficients[i], quantization_table[i]); let s1 = dequantize(coefficients[i + 8], quantization_table[i + 8]); let s2 = dequantize(coefficients[i + 16], quantization_table[i + 16]); let s3 = dequantize(coefficients[i + 24], quantization_table[i + 24]); let s4 = dequantize(coefficients[i + 32], quantization_table[i + 32]); let s5 = dequantize(coefficients[i + 40], quantization_table[i + 40]); let s6 = dequantize(coefficients[i + 48], quantization_table[i + 48]); let s7 = dequantize(coefficients[i + 56], quantization_table[i + 56]); let Kernel { xs: [x0, x1, x2, x3], ts: [t0, t1, t2, t3], } = kernel( [s0, s1, s2, s3, s4, s5, s6, s7], // constants scaled things up by 1<<12; let's bring them back // down, but keep 2 extra bits of precision 512, ); temp[i] = (x0 + t3) >> 10; temp[i + 56] = (x0 - t3) >> 10; temp[i + 8] = (x1 + t2) >> 10; temp[i + 48] = (x1 - t2) >> 10; temp[i + 16] = (x2 + t1) >> 10; temp[i + 40] = (x2 - t1) >> 10; temp[i + 24] = (x3 + t0) >> 10; temp[i + 32] = (x3 - t0) >> 10; } } for (chunk, output_chunk) in temp.chunks_exact(8).zip(output) { let chunk = <&[_; 8]>::try_from(chunk).unwrap(); // constants scaled things up by 1<<12, plus we had 1<<2 from first // loop, plus horizontal and vertical each scale by sqrt(8) so together // we've got an extra 1<<3, so 1<<17 total we need to remove. // so we want to round that, which means adding 0.5 * 1<<17, // aka 65536. Also, we'll end up with -128 to 127 that we want // to encode as 0..255 by adding 128, so we'll add that before the shift const X_SCALE: i32 = 65536 + (128 << 17); // TODO When the minimum rust version supports it // let [s0, rest @ ..] = chunk; let (s0, rest) = chunk.split_first().unwrap(); if *rest == [Wrapping(0); 7] { let dcterm = stbi_clamp((stbi_fsh(*s0) + Wrapping(X_SCALE)) >> 17); output_chunk[0] = dcterm; output_chunk[1] = dcterm; output_chunk[2] = dcterm; output_chunk[3] = dcterm; output_chunk[4] = dcterm; output_chunk[5] = dcterm; output_chunk[6] = dcterm; output_chunk[7] = dcterm; } else { let Kernel { xs: [x0, x1, x2, x3], ts: [t0, t1, t2, t3], } = kernel(*chunk, X_SCALE); output_chunk[0] = stbi_clamp((x0 + t3) >> 17); output_chunk[7] = stbi_clamp((x0 - t3) >> 17); output_chunk[1] = stbi_clamp((x1 + t2) >> 17); output_chunk[6] = stbi_clamp((x1 - t2) >> 17); output_chunk[2] = stbi_clamp((x2 + t1) >> 17); output_chunk[5] = stbi_clamp((x2 - t1) >> 17); output_chunk[3] = stbi_clamp((x3 + t0) >> 17); output_chunk[4] = stbi_clamp((x3 - t0) >> 17); } } } struct Kernel { xs: [Wrapping; 4], ts: [Wrapping; 4], } #[inline] fn kernel_x([s0, s2, s4, s6]: [Wrapping; 4], x_scale: i32) -> [Wrapping; 4] { // Even `chunk` indicies let (t2, t3); { let p2 = s2; let p3 = s6; let p1 = (p2 + p3) * stbi_f2f(0.5411961); t2 = p1 + p3 * stbi_f2f(-1.847759065); t3 = p1 + p2 * stbi_f2f(0.765366865); } let (t0, t1); { let p2 = s0; let p3 = s4; t0 = stbi_fsh(p2 + p3); t1 = stbi_fsh(p2 - p3); } let x0 = t0 + t3; let x3 = t0 - t3; let x1 = t1 + t2; let x2 = t1 - t2; let x_scale = Wrapping(x_scale); [x0 + x_scale, x1 + x_scale, x2 + x_scale, x3 + x_scale] } #[inline] fn kernel_t([s1, s3, s5, s7]: [Wrapping; 4]) -> [Wrapping; 4] { // Odd `chunk` indicies let mut t0 = s7; let mut t1 = s5; let mut t2 = s3; let mut t3 = s1; let p3 = t0 + t2; let p4 = t1 + t3; let p1 = t0 + t3; let p2 = t1 + t2; let p5 = (p3 + p4) * stbi_f2f(1.175875602); t0 *= stbi_f2f(0.298631336); t1 *= stbi_f2f(2.053119869); t2 *= stbi_f2f(3.072711026); t3 *= stbi_f2f(1.501321110); let p1 = p5 + p1 * stbi_f2f(-0.899976223); let p2 = p5 + p2 * stbi_f2f(-2.562915447); let p3 = p3 * stbi_f2f(-1.961570560); let p4 = p4 * stbi_f2f(-0.390180644); t3 += p1 + p4; t2 += p2 + p3; t1 += p2 + p4; t0 += p1 + p3; [t0, t1, t2, t3] } #[inline] fn kernel([s0, s1, s2, s3, s4, s5, s6, s7]: [Wrapping; 8], x_scale: i32) -> Kernel { Kernel { xs: kernel_x([s0, s2, s4, s6], x_scale), ts: kernel_t([s1, s3, s5, s7]), } } #[inline(always)] fn dequantize(c: i16, q: u16) -> Wrapping { Wrapping(i32::from(c) * i32::from(q)) } // 4x4 and 2x2 IDCT based on Rakesh Dugad and Narendra Ahuja: "A Fast Scheme for Image Size Change in the Compressed Domain" (2001). // http://sylvana.net/jpegcrop/jidctred/ fn dequantize_and_idct_block_4x4(coefficients: &[i16], quantization_table: &[u16; 64], output_linestride: usize, output: &mut [u8]) { debug_assert_eq!(coefficients.len(), 64); let mut temp = [Wrapping(0i32); 4 * 4]; const CONST_BITS: usize = 12; const PASS1_BITS: usize = 2; const FINAL_BITS: usize = CONST_BITS + PASS1_BITS + 3; // columns for i in 0..4 { let s0 = Wrapping(coefficients[i + 8 * 0] as i32 * quantization_table[i + 8 * 0] as i32); let s1 = Wrapping(coefficients[i + 8 * 1] as i32 * quantization_table[i + 8 * 1] as i32); let s2 = Wrapping(coefficients[i + 8 * 2] as i32 * quantization_table[i + 8 * 2] as i32); let s3 = Wrapping(coefficients[i + 8 * 3] as i32 * quantization_table[i + 8 * 3] as i32); let x0 = (s0 + s2) << PASS1_BITS; let x2 = (s0 - s2) << PASS1_BITS; let p1 = (s1 + s3) * stbi_f2f(0.541196100); let t0 = (p1 + s3 * stbi_f2f(-1.847759065) + Wrapping(512)) >> (CONST_BITS - PASS1_BITS); let t2 = (p1 + s1 * stbi_f2f(0.765366865) + Wrapping(512)) >> (CONST_BITS - PASS1_BITS); temp[i + 4 * 0] = x0 + t2; temp[i + 4 * 3] = x0 - t2; temp[i + 4 * 1] = x2 + t0; temp[i + 4 * 2] = x2 - t0; } for i in 0 .. 4 { let s0 = temp[i * 4 + 0]; let s1 = temp[i * 4 + 1]; let s2 = temp[i * 4 + 2]; let s3 = temp[i * 4 + 3]; let x0 = (s0 + s2) << CONST_BITS; let x2 = (s0 - s2) << CONST_BITS; let p1 = (s1 + s3) * stbi_f2f(0.541196100); let t0 = p1 + s3 * stbi_f2f(-1.847759065); let t2 = p1 + s1 * stbi_f2f(0.765366865); // constants scaled things up by 1<<12, plus we had 1<<2 from first // loop, plus horizontal and vertical each scale by sqrt(8) so together // we've got an extra 1<<3, so 1<<17 total we need to remove. // so we want to round that, which means adding 0.5 * 1<<17, // aka 65536. Also, we'll end up with -128 to 127 that we want // to encode as 0..255 by adding 128, so we'll add that before the shift let x0 = x0 + Wrapping(1 << (FINAL_BITS - 1)) + Wrapping(128 << FINAL_BITS); let x2 = x2 + Wrapping(1 << (FINAL_BITS - 1)) + Wrapping(128 << FINAL_BITS); output[i * output_linestride + 0] = stbi_clamp((x0 + t2) >> FINAL_BITS); output[i * output_linestride + 3] = stbi_clamp((x0 - t2) >> FINAL_BITS); output[i * output_linestride + 1] = stbi_clamp((x2 + t0) >> FINAL_BITS); output[i * output_linestride + 2] = stbi_clamp((x2 - t0) >> FINAL_BITS); } } fn dequantize_and_idct_block_2x2(coefficients: &[i16], quantization_table: &[u16; 64], output_linestride: usize, output: &mut [u8]) { debug_assert_eq!(coefficients.len(), 64); const SCALE_BITS: usize = 3; // Column 0 let s00 = Wrapping(coefficients[8 * 0] as i32 * quantization_table[8 * 0] as i32); let s10 = Wrapping(coefficients[8 * 1] as i32 * quantization_table[8 * 1] as i32); let x0 = s00 + s10; let x2 = s00 - s10; // Column 1 let s01 = Wrapping(coefficients[8 * 0 + 1] as i32 * quantization_table[8 * 0 + 1] as i32); let s11 = Wrapping(coefficients[8 * 1 + 1] as i32 * quantization_table[8 * 1 + 1] as i32); let x1 = s01 + s11; let x3 = s01 - s11; let x0 = x0 + Wrapping(1 << (SCALE_BITS - 1)) + Wrapping(128 << SCALE_BITS); let x2 = x2 + Wrapping(1 << (SCALE_BITS - 1)) + Wrapping(128 << SCALE_BITS); // Row 0 output[0] = stbi_clamp((x0 + x1) >> SCALE_BITS); output[1] = stbi_clamp((x0 - x1) >> SCALE_BITS); // Row 1 output[output_linestride + 0] = stbi_clamp((x2 + x3) >> SCALE_BITS); output[output_linestride + 1] = stbi_clamp((x2 - x3) >> SCALE_BITS); } fn dequantize_and_idct_block_1x1(coefficients: &[i16], quantization_table: &[u16; 64], _output_linestride: usize, output: &mut [u8]) { debug_assert_eq!(coefficients.len(), 64); let s0 = (Wrapping(coefficients[0] as i32 * quantization_table[0] as i32) + Wrapping(128 * 8)) / Wrapping(8); output[0] = stbi_clamp(s0); } // take a -128..127 value and stbi__clamp it and convert to 0..255 fn stbi_clamp(x: Wrapping) -> u8 { x.0.max(0).min(255) as u8 } fn stbi_f2f(x: f32) -> Wrapping { Wrapping((x * 4096.0 + 0.5) as i32) } fn stbi_fsh(x: Wrapping) -> Wrapping { x << 12 } #[test] fn test_dequantize_and_idct_block_8x8() { let coefficients: [i16; 8 * 8] = [ -14, -39, 58, -2, 3, 3, 0, 1, 11, 27, 4, -3, 3, 0, 1, 0, -6, -13, -9, -1, -2, -1, 0, 0, -4, 0, -1, -2, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, -3, -2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]; let quantization_table: [u16; 8 * 8] = [ 8, 6, 5, 8, 12, 20, 26, 31, 6, 6, 7, 10, 13, 29, 30, 28, 7, 7, 8, 12, 20, 29, 35, 28, 7, 9, 11, 15, 26, 44, 40, 31, 9, 11, 19, 28, 34, 55, 52, 39, 12, 18, 28, 32, 41, 52, 57, 46, 25, 32, 39, 44, 52, 61, 60, 51, 36, 46, 48, 49, 56, 50, 52, 50]; let output_linestride: usize = 8; let mut output = [0u8; 8 * 8]; dequantize_and_idct_block_8x8( &coefficients, &quantization_table, output_linestride, &mut output); let expected_output = [ 118, 92, 110, 83, 77, 93, 144, 198, 172, 116, 114, 87, 78, 93, 146, 191, 194, 107, 91, 76, 71, 93, 160, 198, 196, 100, 80, 74, 67, 92, 174, 209, 182, 104, 88, 81, 68, 89, 178, 206, 105, 64, 59, 59, 63, 94, 183, 201, 35, 27, 28, 37, 72, 121, 203, 204, 37, 45, 41, 47, 98, 154, 223, 208]; assert_eq!(&output[..], &expected_output[..]); } #[test] fn test_dequantize_and_idct_block_8x8_all_zero() { let mut output = [0u8; 8 * 8]; dequantize_and_idct_block_8x8( &[0; 8*8], &[666; 8*8], 8, &mut output); assert_eq!(&output[..], &[128; 8*8][..]); } #[test] fn test_dequantize_and_idct_block_8x8_saturated() { let mut output = [0u8; 8 * 8]; dequantize_and_idct_block_8x8( &[std::i16::MAX; 8*8], &[std::u16::MAX; 8*8], 8, &mut output); let expected = [ 0, 0, 0, 255, 255, 0, 0, 255, 0, 0, 215, 0, 0, 255, 255, 0, 255, 255, 255, 255, 255, 0, 0, 255, 0, 0, 255, 0, 255, 0, 255, 255, 0, 0, 255, 255, 0, 255, 0, 0, 255, 255, 0, 255, 255, 255, 170, 0, 0, 255, 0, 0, 0, 0, 0, 255, 255, 255, 0, 255, 0, 255, 0, 0]; assert_eq!(&output[..], &expected[..]); } jpeg-decoder-0.1.22/src/lib.rs010064400017500001750000000026731400303361400142120ustar 00000000000000//! This crate contains a JPEG decoder. //! //! # Examples //! //! ``` //! use jpeg_decoder::Decoder; //! use std::fs::File; //! use std::io::BufReader; //! //! let file = File::open("tests/reftest/images/extraneous-data.jpg").expect("failed to open file"); //! let mut decoder = Decoder::new(BufReader::new(file)); //! let pixels = decoder.decode().expect("failed to decode image"); //! let metadata = decoder.info().unwrap(); //! ``` //! //! Get metadata from a file without decoding it: //! //! ``` //! use jpeg_decoder::Decoder; //! use std::fs::File; //! use std::io::BufReader; //! //! let file = File::open("tests/reftest/images/extraneous-data.jpg").expect("failed to open file"); //! let mut decoder = Decoder::new(BufReader::new(file)); //! decoder.read_info().expect("failed to read metadata"); //! let metadata = decoder.info().unwrap(); //! ``` #![deny(missing_docs)] #![forbid(unsafe_code)] #[cfg(feature="rayon")] extern crate rayon; pub use decoder::{Decoder, ImageInfo, PixelFormat}; pub use error::{Error, UnsupportedFeature}; mod decoder; mod error; mod huffman; mod idct; mod marker; mod parser; mod upsampler; mod worker; fn read_u8(reader: &mut R) -> std::io::Result { let mut buf = [0]; reader.read_exact(&mut buf)?; Ok(buf[0]) } fn read_u16_from_be(reader: &mut R) -> std::io::Result { let mut buf = [0, 0]; reader.read_exact(&mut buf)?; Ok(u16::from_be_bytes(buf)) } jpeg-decoder-0.1.22/src/marker.rs010064400017500001750000000102421367172204600147320ustar 00000000000000// Table B.1 #[derive(Clone, Copy, Debug, PartialEq)] pub enum Marker { /// Start Of Frame markers /// /// - SOF(0): Baseline DCT (Huffman coding) /// - SOF(1): Extended sequential DCT (Huffman coding) /// - SOF(2): Progressive DCT (Huffman coding) /// - SOF(3): Lossless (sequential) (Huffman coding) /// - SOF(5): Differential sequential DCT (Huffman coding) /// - SOF(6): Differential progressive DCT (Huffman coding) /// - SOF(7): Differential lossless (sequential) (Huffman coding) /// - SOF(9): Extended sequential DCT (arithmetic coding) /// - SOF(10): Progressive DCT (arithmetic coding) /// - SOF(11): Lossless (sequential) (arithmetic coding) /// - SOF(13): Differential sequential DCT (arithmetic coding) /// - SOF(14): Differential progressive DCT (arithmetic coding) /// - SOF(15): Differential lossless (sequential) (arithmetic coding) SOF(u8), /// Reserved for JPEG extensions JPG, /// Define Huffman table(s) DHT, /// Define arithmetic coding conditioning(s) DAC, /// Restart with modulo 8 count `m` RST(u8), /// Start of image SOI, /// End of image EOI, /// Start of scan SOS, /// Define quantization table(s) DQT, /// Define number of lines DNL, /// Define restart interval DRI, /// Define hierarchical progression DHP, /// Expand reference component(s) EXP, /// Reserved for application segments APP(u8), /// Reserved for JPEG extensions JPGn(u8), /// Comment COM, /// For temporary private use in arithmetic coding TEM, /// Reserved RES, } impl Marker { pub fn has_length(self) -> bool { use self::Marker::*; match self { RST(..) | SOI | EOI | TEM => false, _ => true, } } pub fn from_u8(n: u8) -> Option { use self::Marker::*; match n { 0x00 => None, // Byte stuffing 0x01 => Some(TEM), 0x02 ..= 0xBF => Some(RES), 0xC0 => Some(SOF(0)), 0xC1 => Some(SOF(1)), 0xC2 => Some(SOF(2)), 0xC3 => Some(SOF(3)), 0xC4 => Some(DHT), 0xC5 => Some(SOF(5)), 0xC6 => Some(SOF(6)), 0xC7 => Some(SOF(7)), 0xC8 => Some(JPG), 0xC9 => Some(SOF(9)), 0xCA => Some(SOF(10)), 0xCB => Some(SOF(11)), 0xCC => Some(DAC), 0xCD => Some(SOF(13)), 0xCE => Some(SOF(14)), 0xCF => Some(SOF(15)), 0xD0 => Some(RST(0)), 0xD1 => Some(RST(1)), 0xD2 => Some(RST(2)), 0xD3 => Some(RST(3)), 0xD4 => Some(RST(4)), 0xD5 => Some(RST(5)), 0xD6 => Some(RST(6)), 0xD7 => Some(RST(7)), 0xD8 => Some(SOI), 0xD9 => Some(EOI), 0xDA => Some(SOS), 0xDB => Some(DQT), 0xDC => Some(DNL), 0xDD => Some(DRI), 0xDE => Some(DHP), 0xDF => Some(EXP), 0xE0 => Some(APP(0)), 0xE1 => Some(APP(1)), 0xE2 => Some(APP(2)), 0xE3 => Some(APP(3)), 0xE4 => Some(APP(4)), 0xE5 => Some(APP(5)), 0xE6 => Some(APP(6)), 0xE7 => Some(APP(7)), 0xE8 => Some(APP(8)), 0xE9 => Some(APP(9)), 0xEA => Some(APP(10)), 0xEB => Some(APP(11)), 0xEC => Some(APP(12)), 0xED => Some(APP(13)), 0xEE => Some(APP(14)), 0xEF => Some(APP(15)), 0xF0 => Some(JPGn(0)), 0xF1 => Some(JPGn(1)), 0xF2 => Some(JPGn(2)), 0xF3 => Some(JPGn(3)), 0xF4 => Some(JPGn(4)), 0xF5 => Some(JPGn(5)), 0xF6 => Some(JPGn(6)), 0xF7 => Some(JPGn(7)), 0xF8 => Some(JPGn(8)), 0xF9 => Some(JPGn(9)), 0xFA => Some(JPGn(10)), 0xFB => Some(JPGn(11)), 0xFC => Some(JPGn(12)), 0xFD => Some(JPGn(13)), 0xFE => Some(COM), 0xFF => None, // Fill byte } } } jpeg-decoder-0.1.22/src/parser.rs010064400017500001750000000527241400303361400147420ustar 00000000000000use crate::{read_u16_from_be, read_u8}; use error::{Error, Result, UnsupportedFeature}; use huffman::{HuffmanTable, HuffmanTableClass}; use marker::Marker; use marker::Marker::*; use std::io::{self, Read}; use std::ops::Range; #[derive(Clone, Copy, Debug, PartialEq)] pub struct Dimensions { pub width: u16, pub height: u16, } #[derive(Clone, Copy, Debug, PartialEq)] pub enum EntropyCoding { Huffman, Arithmetic, } #[derive(Clone, Copy, Debug, PartialEq)] pub enum CodingProcess { DctSequential, DctProgressive, Lossless, } #[derive(Clone)] pub struct FrameInfo { pub is_baseline: bool, pub is_differential: bool, pub coding_process: CodingProcess, pub entropy_coding: EntropyCoding, pub precision: u8, pub image_size: Dimensions, pub output_size: Dimensions, pub mcu_size: Dimensions, pub components: Vec, } #[derive(Debug)] pub struct ScanInfo { pub component_indices: Vec, pub dc_table_indices: Vec, pub ac_table_indices: Vec, pub spectral_selection: Range, pub successive_approximation_high: u8, pub successive_approximation_low: u8, } #[derive(Clone, Debug)] pub struct Component { pub identifier: u8, pub horizontal_sampling_factor: u8, pub vertical_sampling_factor: u8, pub quantization_table_index: usize, pub dct_scale: usize, pub size: Dimensions, pub block_size: Dimensions, } #[derive(Debug)] pub enum AppData { Adobe(AdobeColorTransform), Jfif, Avi1, Icc(IccChunk), } // http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/JPEG.html#Adobe #[derive(Clone, Copy, Debug, PartialEq)] pub enum AdobeColorTransform { // RGB or CMYK Unknown, YCbCr, // YCbCrK YCCK, } #[derive(Debug)] pub struct IccChunk { pub num_markers: u8, pub seq_no: u8, pub data: Vec, } impl FrameInfo { pub(crate) fn update_idct_size(&mut self, idct_size: usize) -> Result<()> { for component in &mut self.components { component.dct_scale = idct_size; } update_component_sizes(self.image_size, &mut self.components)?; self.output_size = Dimensions { width: (self.image_size.width as f32 * idct_size as f32 / 8.0).ceil() as u16, height: (self.image_size.height as f32 * idct_size as f32 / 8.0).ceil() as u16 }; Ok(()) } } fn read_length(reader: &mut R, marker: Marker) -> Result { assert!(marker.has_length()); // length is including itself. let length = usize::from(read_u16_from_be(reader)?); if length < 2 { return Err(Error::Format(format!("encountered {:?} with invalid length {}", marker, length))); } Ok(length - 2) } fn skip_bytes(reader: &mut R, length: usize) -> Result<()> { let length = length as u64; let to_skip = &mut reader.by_ref().take(length); let copied = io::copy(to_skip, &mut io::sink())?; if copied < length { Err(Error::Io(io::ErrorKind::UnexpectedEof.into())) } else { Ok(()) } } // Section B.2.2 pub fn parse_sof(reader: &mut R, marker: Marker) -> Result { let length = read_length(reader, marker)?; if length <= 6 { return Err(Error::Format("invalid length in SOF".to_owned())); } let is_baseline = marker == SOF(0); let is_differential = match marker { SOF(0 ..= 3) | SOF(9 ..= 11) => false, SOF(5 ..= 7) | SOF(13 ..= 15) => true, _ => panic!(), }; let coding_process = match marker { SOF(0) | SOF(1) | SOF(5) | SOF(9) | SOF(13) => CodingProcess::DctSequential, SOF(2) | SOF(6) | SOF(10) | SOF(14) => CodingProcess::DctProgressive, SOF(3) | SOF(7) | SOF(11) | SOF(15) => CodingProcess::Lossless, _ => panic!(), }; let entropy_coding = match marker { SOF(0 ..= 3) | SOF(5 ..= 7) => EntropyCoding::Huffman, SOF(9 ..= 11) | SOF(13 ..= 15) => EntropyCoding::Arithmetic, _ => panic!(), }; let precision = read_u8(reader)?; match precision { 8 => {}, 12 => { if is_baseline { return Err(Error::Format("12 bit sample precision is not allowed in baseline".to_owned())); } }, _ => { if coding_process != CodingProcess::Lossless { return Err(Error::Format(format!("invalid precision {} in frame header", precision))) } }, } let height = read_u16_from_be(reader)?; let width = read_u16_from_be(reader)?; // height: // "Value 0 indicates that the number of lines shall be defined by the DNL marker and // parameters at the end of the first scan (see B.2.5)." if height == 0 { return Err(Error::Unsupported(UnsupportedFeature::DNL)); } if width == 0 { return Err(Error::Format("zero width in frame header".to_owned())); } let component_count = read_u8(reader)?; if component_count == 0 { return Err(Error::Format("zero component count in frame header".to_owned())); } if coding_process == CodingProcess::DctProgressive && component_count > 4 { return Err(Error::Format("progressive frame with more than 4 components".to_owned())); } if length != 6 + 3 * component_count as usize { return Err(Error::Format("invalid length in SOF".to_owned())); } let mut components: Vec = Vec::with_capacity(component_count as usize); for _ in 0 .. component_count { let identifier = read_u8(reader)?; // Each component's identifier must be unique. if components.iter().any(|c| c.identifier == identifier) { return Err(Error::Format(format!("duplicate frame component identifier {}", identifier))); } let byte = read_u8(reader)?; let horizontal_sampling_factor = byte >> 4; let vertical_sampling_factor = byte & 0x0f; if horizontal_sampling_factor == 0 || horizontal_sampling_factor > 4 { return Err(Error::Format(format!("invalid horizontal sampling factor {}", horizontal_sampling_factor))); } if vertical_sampling_factor == 0 || vertical_sampling_factor > 4 { return Err(Error::Format(format!("invalid vertical sampling factor {}", vertical_sampling_factor))); } let quantization_table_index = read_u8(reader)?; if quantization_table_index > 3 || (coding_process == CodingProcess::Lossless && quantization_table_index != 0) { return Err(Error::Format(format!("invalid quantization table index {}", quantization_table_index))); } components.push(Component { identifier: identifier, horizontal_sampling_factor: horizontal_sampling_factor, vertical_sampling_factor: vertical_sampling_factor, quantization_table_index: quantization_table_index as usize, dct_scale: 8, size: Dimensions {width: 0, height: 0}, block_size: Dimensions {width: 0, height: 0}, }); } let mcu_size = update_component_sizes(Dimensions { width, height }, &mut components)?; Ok(FrameInfo { is_baseline: is_baseline, is_differential: is_differential, coding_process: coding_process, entropy_coding: entropy_coding, precision: precision, image_size: Dimensions { width, height }, output_size: Dimensions { width, height }, mcu_size, components: components, }) } /// Returns ceil(x/y), requires x>0 fn ceil_div(x: u32, y: u32) -> Result { if x == 0 || y == 0 { // TODO Determine how this error is reached. Can we validate input // earlier and error out then? return Err(Error::Format("invalid dimensions".to_owned())); } Ok((1 + ((x - 1) / y)) as u16) } fn update_component_sizes(size: Dimensions, components: &mut [Component]) -> Result { let h_max = components.iter().map(|c| c.horizontal_sampling_factor).max().unwrap() as u32; let v_max = components.iter().map(|c| c.vertical_sampling_factor).max().unwrap() as u32; let mcu_size = Dimensions { width: ceil_div(size.width as u32, h_max * 8)?, height: ceil_div(size.height as u32, v_max * 8)?, }; for component in components { component.size.width = ceil_div(size.width as u32 * component.horizontal_sampling_factor as u32 * component.dct_scale as u32, h_max * 8)?; component.size.height = ceil_div(size.height as u32 * component.vertical_sampling_factor as u32 * component.dct_scale as u32, v_max * 8)?; component.block_size.width = mcu_size.width * component.horizontal_sampling_factor as u16; component.block_size.height = mcu_size.height * component.vertical_sampling_factor as u16; } Ok(mcu_size) } #[test] fn test_update_component_sizes() { let mut components = [Component { identifier: 1, horizontal_sampling_factor: 2, vertical_sampling_factor: 2, quantization_table_index: 0, dct_scale: 8, size: Dimensions { width: 0, height: 0 }, block_size: Dimensions { width: 0, height: 0 }, }]; let mcu = update_component_sizes( Dimensions { width: 800, height: 280 }, &mut components).unwrap(); assert_eq!(mcu, Dimensions { width: 50, height: 18 }); assert_eq!(components[0].block_size, Dimensions { width: 100, height: 36 }); assert_eq!(components[0].size, Dimensions { width: 800, height: 280 }); } // Section B.2.3 pub fn parse_sos(reader: &mut R, frame: &FrameInfo) -> Result { let length = read_length(reader, SOS)?; if 0 == length { return Err(Error::Format("zero length in SOS".to_owned())); } let component_count = read_u8(reader)?; if component_count == 0 || component_count > 4 { return Err(Error::Format(format!("invalid component count {} in scan header", component_count))); } if length != 4 + 2 * component_count as usize { return Err(Error::Format("invalid length in SOS".to_owned())); } let mut component_indices = Vec::with_capacity(component_count as usize); let mut dc_table_indices = Vec::with_capacity(component_count as usize); let mut ac_table_indices = Vec::with_capacity(component_count as usize); for _ in 0 .. component_count { let identifier = read_u8(reader)?; let component_index = match frame.components.iter().position(|c| c.identifier == identifier) { Some(value) => value, None => return Err(Error::Format(format!("scan component identifier {} does not match any of the component identifiers defined in the frame", identifier))), }; // Each of the scan's components must be unique. if component_indices.contains(&component_index) { return Err(Error::Format(format!("duplicate scan component identifier {}", identifier))); } // "... the ordering in the scan header shall follow the ordering in the frame header." if component_index < *component_indices.iter().max().unwrap_or(&0) { return Err(Error::Format("the scan component order does not follow the order in the frame header".to_owned())); } let byte = read_u8(reader)?; let dc_table_index = byte >> 4; let ac_table_index = byte & 0x0f; if dc_table_index > 3 || (frame.is_baseline && dc_table_index > 1) { return Err(Error::Format(format!("invalid dc table index {}", dc_table_index))); } if ac_table_index > 3 || (frame.is_baseline && ac_table_index > 1) { return Err(Error::Format(format!("invalid ac table index {}", ac_table_index))); } component_indices.push(component_index); dc_table_indices.push(dc_table_index as usize); ac_table_indices.push(ac_table_index as usize); } let blocks_per_mcu = component_indices.iter().map(|&i| { frame.components[i].horizontal_sampling_factor as u32 * frame.components[i].vertical_sampling_factor as u32 }).fold(0, ::std::ops::Add::add); if component_count > 1 && blocks_per_mcu > 10 { return Err(Error::Format("scan with more than one component and more than 10 blocks per MCU".to_owned())); } let spectral_selection_start = read_u8(reader)?; let spectral_selection_end = read_u8(reader)?; let byte = read_u8(reader)?; let successive_approximation_high = byte >> 4; let successive_approximation_low = byte & 0x0f; if frame.coding_process == CodingProcess::DctProgressive { if spectral_selection_end > 63 || spectral_selection_start > spectral_selection_end || (spectral_selection_start == 0 && spectral_selection_end != 0) { return Err(Error::Format(format!("invalid spectral selection parameters: ss={}, se={}", spectral_selection_start, spectral_selection_end))); } if spectral_selection_start != 0 && component_count != 1 { return Err(Error::Format("spectral selection scan with AC coefficients can't have more than one component".to_owned())); } if successive_approximation_high > 13 || successive_approximation_low > 13 { return Err(Error::Format(format!("invalid successive approximation parameters: ah={}, al={}", successive_approximation_high, successive_approximation_low))); } // Section G.1.1.1.2 // "Each scan which follows the first scan for a given band progressively improves // the precision of the coefficients by one bit, until full precision is reached." if successive_approximation_high != 0 && successive_approximation_high != successive_approximation_low + 1 { return Err(Error::Format("successive approximation scan with more than one bit of improvement".to_owned())); } } else { if spectral_selection_start != 0 || spectral_selection_end != 63 { return Err(Error::Format("spectral selection is not allowed in non-progressive scan".to_owned())); } if successive_approximation_high != 0 || successive_approximation_low != 0 { return Err(Error::Format("successive approximation is not allowed in non-progressive scan".to_owned())); } } Ok(ScanInfo { component_indices: component_indices, dc_table_indices: dc_table_indices, ac_table_indices: ac_table_indices, spectral_selection: Range { start: spectral_selection_start, end: spectral_selection_end + 1, }, successive_approximation_high: successive_approximation_high, successive_approximation_low: successive_approximation_low, }) } // Section B.2.4.1 pub fn parse_dqt(reader: &mut R) -> Result<[Option<[u16; 64]>; 4]> { let mut length = read_length(reader, DQT)?; let mut tables = [None; 4]; // Each DQT segment may contain multiple quantization tables. while length > 0 { let byte = read_u8(reader)?; let precision = (byte >> 4) as usize; let index = (byte & 0x0f) as usize; // The combination of 8-bit sample precision and 16-bit quantization tables is explicitly // disallowed by the JPEG spec: // "An 8-bit DCT-based process shall not use a 16-bit precision quantization table." // "Pq: Quantization table element precision – Specifies the precision of the Qk // values. Value 0 indicates 8-bit Qk values; value 1 indicates 16-bit Qk values. Pq // shall be zero for 8 bit sample precision P (see B.2.2)." // libjpeg allows this behavior though, and there are images in the wild using it. So to // match libjpeg's behavior we are deviating from the JPEG spec here. if precision > 1 { return Err(Error::Format(format!("invalid precision {} in DQT", precision))); } if index > 3 { return Err(Error::Format(format!("invalid destination identifier {} in DQT", index))); } if length < 65 + 64 * precision { return Err(Error::Format("invalid length in DQT".to_owned())); } let mut table = [0u16; 64]; for item in table.iter_mut() { *item = match precision { 0 => u16::from(read_u8(reader)?), 1 => read_u16_from_be(reader)?, _ => unreachable!(), }; } if table.iter().any(|&val| val == 0) { return Err(Error::Format("quantization table contains element with a zero value".to_owned())); } tables[index] = Some(table); length -= 65 + 64 * precision; } Ok(tables) } // Section B.2.4.2 pub fn parse_dht(reader: &mut R, is_baseline: Option) -> Result<(Vec>, Vec>)> { let mut length = read_length(reader, DHT)?; let mut dc_tables = vec![None, None, None, None]; let mut ac_tables = vec![None, None, None, None]; // Each DHT segment may contain multiple huffman tables. while length > 17 { let byte = read_u8(reader)?; let class = byte >> 4; let index = (byte & 0x0f) as usize; if class != 0 && class != 1 { return Err(Error::Format(format!("invalid class {} in DHT", class))); } if is_baseline == Some(true) && index > 1 { return Err(Error::Format("a maximum of two huffman tables per class are allowed in baseline".to_owned())); } if index > 3 { return Err(Error::Format(format!("invalid destination identifier {} in DHT", index))); } let mut counts = [0u8; 16]; reader.read_exact(&mut counts)?; let size = counts.iter().map(|&val| val as usize).fold(0, ::std::ops::Add::add); if size == 0 { return Err(Error::Format("encountered table with zero length in DHT".to_owned())); } else if size > 256 { return Err(Error::Format("encountered table with excessive length in DHT".to_owned())); } else if size > length - 17 { return Err(Error::Format("invalid length in DHT".to_owned())); } let mut values = vec![0u8; size]; reader.read_exact(&mut values)?; match class { 0 => dc_tables[index] = Some(HuffmanTable::new(&counts, &values, HuffmanTableClass::DC)?), 1 => ac_tables[index] = Some(HuffmanTable::new(&counts, &values, HuffmanTableClass::AC)?), _ => unreachable!(), } length -= 17 + size; } if length != 0 { return Err(Error::Format("invalid length in DHT".to_owned())); } Ok((dc_tables, ac_tables)) } // Section B.2.4.4 pub fn parse_dri(reader: &mut R) -> Result { let length = read_length(reader, DRI)?; if length != 2 { return Err(Error::Format("DRI with invalid length".to_owned())); } Ok(read_u16_from_be(reader)?) } // Section B.2.4.5 pub fn parse_com(reader: &mut R) -> Result> { let length = read_length(reader, COM)?; let mut buffer = vec![0u8; length]; reader.read_exact(&mut buffer)?; Ok(buffer) } // Section B.2.4.6 pub fn parse_app(reader: &mut R, marker: Marker) -> Result> { let length = read_length(reader, marker)?; let mut bytes_read = 0; let mut result = None; match marker { APP(0) => { if length >= 5 { let mut buffer = [0u8; 5]; reader.read_exact(&mut buffer)?; bytes_read = buffer.len(); // http://www.w3.org/Graphics/JPEG/jfif3.pdf if &buffer[0 .. 5] == &[b'J', b'F', b'I', b'F', b'\0'] { result = Some(AppData::Jfif); // https://sno.phy.queensu.ca/~phil/exiftool/TagNames/JPEG.html#AVI1 } else if &buffer[0 .. 5] == &[b'A', b'V', b'I', b'1', b'\0'] { result = Some(AppData::Avi1); } } } APP(2) => { if length > 14 { let mut buffer = [0u8; 14]; reader.read_exact(&mut buffer)?; bytes_read = buffer.len(); // http://www.color.org/ICC_Minor_Revision_for_Web.pdf // B.4 Embedding ICC profiles in JFIF files if &buffer[0..12] == b"ICC_PROFILE\0" { let mut data = vec![0; length - bytes_read]; reader.read_exact(&mut data)?; bytes_read += data.len(); result = Some(AppData::Icc(IccChunk { seq_no: buffer[12], num_markers: buffer[13], data, })); } } } APP(14) => { if length >= 12 { let mut buffer = [0u8; 12]; reader.read_exact(&mut buffer)?; bytes_read = buffer.len(); // http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/JPEG.html#Adobe if &buffer[0 .. 6] == &[b'A', b'd', b'o', b'b', b'e', b'\0'] { let color_transform = match buffer[11] { 0 => AdobeColorTransform::Unknown, 1 => AdobeColorTransform::YCbCr, 2 => AdobeColorTransform::YCCK, _ => return Err(Error::Format("invalid color transform in adobe app segment".to_owned())), }; result = Some(AppData::Adobe(color_transform)); } } }, _ => {}, } skip_bytes(reader, length - bytes_read)?; Ok(result) } jpeg-decoder-0.1.22/src/upsampler.rs010064400017500001750000000212521400057706300154560ustar 00000000000000use error::{Error, Result, UnsupportedFeature}; use parser::Component; pub struct Upsampler { components: Vec, line_buffer_size: usize } struct UpsamplerComponent { upsampler: Box, width: usize, height: usize, row_stride: usize, } impl Upsampler { pub fn new(components: &[Component], output_width: u16, output_height: u16) -> Result { let h_max = components.iter().map(|c| c.horizontal_sampling_factor).max().unwrap(); let v_max = components.iter().map(|c| c.vertical_sampling_factor).max().unwrap(); let mut upsampler_components = Vec::with_capacity(components.len()); for component in components { let upsampler = choose_upsampler((component.horizontal_sampling_factor, component.vertical_sampling_factor), (h_max, v_max), output_width, output_height)?; upsampler_components.push(UpsamplerComponent { upsampler: upsampler, width: component.size.width as usize, height: component.size.height as usize, row_stride: component.block_size.width as usize * component.dct_scale, }); } let buffer_size = components.iter().map(|c| c.size.width).max().unwrap() as usize * h_max as usize; Ok(Upsampler { components: upsampler_components, line_buffer_size: buffer_size }) } pub fn upsample_and_interleave_row(&self, component_data: &[Vec], row: usize, output_width: usize, output: &mut [u8]) { let component_count = component_data.len(); let mut line_buffer = vec![0u8; self.line_buffer_size]; debug_assert_eq!(component_count, self.components.len()); for (i, component) in self.components.iter().enumerate() { component.upsampler.upsample_row(&component_data[i], component.width, component.height, component.row_stride, row, output_width, &mut line_buffer); for x in 0 .. output_width { output[x * component_count + i] = line_buffer[x]; } } } } struct UpsamplerH1V1; struct UpsamplerH2V1; struct UpsamplerH1V2; struct UpsamplerH2V2; struct UpsamplerGeneric { horizontal_scaling_factor: u8, vertical_scaling_factor: u8 } fn choose_upsampler(sampling_factors: (u8, u8), max_sampling_factors: (u8, u8), output_width: u16, output_height: u16) -> Result> { let h1 = sampling_factors.0 == max_sampling_factors.0 || output_width == 1; let v1 = sampling_factors.1 == max_sampling_factors.1 || output_height == 1; let h2 = sampling_factors.0 * 2 == max_sampling_factors.0; let v2 = sampling_factors.1 * 2 == max_sampling_factors.1; if h1 && v1 { Ok(Box::new(UpsamplerH1V1)) } else if h2 && v1 { Ok(Box::new(UpsamplerH2V1)) } else if h1 && v2 { Ok(Box::new(UpsamplerH1V2)) } else if h2 && v2 { Ok(Box::new(UpsamplerH2V2)) } else { if max_sampling_factors.0 % sampling_factors.0 != 0 || max_sampling_factors.1 % sampling_factors.1 != 0 { Err(Error::Unsupported(UnsupportedFeature::NonIntegerSubsamplingRatio)) } else { Ok(Box::new(UpsamplerGeneric { horizontal_scaling_factor: max_sampling_factors.0 / sampling_factors.0, vertical_scaling_factor: max_sampling_factors.1 / sampling_factors.1 })) } } } trait Upsample { fn upsample_row(&self, input: &[u8], input_width: usize, input_height: usize, row_stride: usize, row: usize, output_width: usize, output: &mut [u8]); } impl Upsample for UpsamplerH1V1 { fn upsample_row(&self, input: &[u8], _input_width: usize, _input_height: usize, row_stride: usize, row: usize, output_width: usize, output: &mut [u8]) { let input = &input[row * row_stride ..]; output[..output_width].copy_from_slice(&input[..output_width]); } } impl Upsample for UpsamplerH2V1 { fn upsample_row(&self, input: &[u8], input_width: usize, _input_height: usize, row_stride: usize, row: usize, _output_width: usize, output: &mut [u8]) { let input = &input[row * row_stride ..]; if input_width == 1 { output[0] = input[0]; output[1] = input[0]; return; } output[0] = input[0]; output[1] = ((input[0] as u32 * 3 + input[1] as u32 + 2) >> 2) as u8; for i in 1 .. input_width - 1 { let sample = 3 * input[i] as u32 + 2; output[i * 2] = ((sample + input[i - 1] as u32) >> 2) as u8; output[i * 2 + 1] = ((sample + input[i + 1] as u32) >> 2) as u8; } output[(input_width - 1) * 2] = ((input[input_width - 1] as u32 * 3 + input[input_width - 2] as u32 + 2) >> 2) as u8; output[(input_width - 1) * 2 + 1] = input[input_width - 1]; } } impl Upsample for UpsamplerH1V2 { fn upsample_row(&self, input: &[u8], _input_width: usize, input_height: usize, row_stride: usize, row: usize, output_width: usize, output: &mut [u8]) { let row_near = row as f32 / 2.0; // If row_near's fractional is 0.0 we want row_far to be the previous row and if it's 0.5 we // want it to be the next row. let row_far = (row_near + row_near.fract() * 3.0 - 0.25).min((input_height - 1) as f32); let input_near = &input[row_near as usize * row_stride ..]; let input_far = &input[row_far as usize * row_stride ..]; for i in 0 .. output_width { output[i] = ((3 * input_near[i] as u32 + input_far[i] as u32 + 2) >> 2) as u8; } } } impl Upsample for UpsamplerH2V2 { fn upsample_row(&self, input: &[u8], input_width: usize, input_height: usize, row_stride: usize, row: usize, _output_width: usize, output: &mut [u8]) { let row_near = row as f32 / 2.0; // If row_near's fractional is 0.0 we want row_far to be the previous row and if it's 0.5 we // want it to be the next row. let row_far = (row_near + row_near.fract() * 3.0 - 0.25).min((input_height - 1) as f32); let input_near = &input[row_near as usize * row_stride ..]; let input_far = &input[row_far as usize * row_stride ..]; if input_width == 1 { let value = ((3 * input_near[0] as u32 + input_far[0] as u32 + 2) >> 2) as u8; output[0] = value; output[1] = value; return; } let mut t1 = 3 * input_near[0] as u32 + input_far[0] as u32; output[0] = ((t1 + 2) >> 2) as u8; for i in 1 .. input_width { let t0 = t1; t1 = 3 * input_near[i] as u32 + input_far[i] as u32; output[i * 2 - 1] = ((3 * t0 + t1 + 8) >> 4) as u8; output[i * 2] = ((3 * t1 + t0 + 8) >> 4) as u8; } output[input_width * 2 - 1] = ((t1 + 2) >> 2) as u8; } } impl Upsample for UpsamplerGeneric { // Uses nearest neighbor sampling fn upsample_row(&self, input: &[u8], input_width: usize, _input_height: usize, row_stride: usize, row: usize, _output_width: usize, output: &mut [u8]) { let mut index = 0; let start = (row / self.vertical_scaling_factor as usize) * row_stride; let input = &input[start..(start + input_width)]; for val in input { for _ in 0..self.horizontal_scaling_factor { output[index] = *val; index += 1; } } } } jpeg-decoder-0.1.22/src/worker/immediate.rs010064400017500001750000000055171367172151600167320ustar 00000000000000use decoder::MAX_COMPONENTS; use error::Result; use idct::dequantize_and_idct_block; use std::mem; use std::sync::Arc; use parser::Component; use super::{RowData, Worker}; pub struct ImmediateWorker { offsets: [usize; MAX_COMPONENTS], results: Vec>, components: Vec>, quantization_tables: Vec>>, } impl ImmediateWorker { pub fn new_immediate() -> ImmediateWorker { ImmediateWorker { offsets: [0; MAX_COMPONENTS], results: vec![Vec::new(); MAX_COMPONENTS], components: vec![None; MAX_COMPONENTS], quantization_tables: vec![None; MAX_COMPONENTS], } } pub fn start_immediate(&mut self, data: RowData) { assert!(self.results[data.index].is_empty()); self.offsets[data.index] = 0; self.results[data.index].resize(data.component.block_size.width as usize * data.component.block_size.height as usize * data.component.dct_scale * data.component.dct_scale, 0u8); self.components[data.index] = Some(data.component); self.quantization_tables[data.index] = Some(data.quantization_table); } pub fn append_row_immediate(&mut self, (index, data): (usize, Vec)) { // Convert coefficients from a MCU row to samples. let component = self.components[index].as_ref().unwrap(); let quantization_table = self.quantization_tables[index].as_ref().unwrap(); let block_count = component.block_size.width as usize * component.vertical_sampling_factor as usize; let line_stride = component.block_size.width as usize * component.dct_scale; assert_eq!(data.len(), block_count * 64); for i in 0..block_count { let x = (i % component.block_size.width as usize) * component.dct_scale; let y = (i / component.block_size.width as usize) * component.dct_scale; let coefficients = &data[i * 64..(i + 1) * 64]; let output = &mut self.results[index][self.offsets[index] + y * line_stride + x..]; dequantize_and_idct_block(component.dct_scale, coefficients, quantization_table, line_stride, output); } self.offsets[index] += block_count * component.dct_scale * component.dct_scale; } pub fn get_result_immediate(&mut self, index: usize) -> Vec { mem::replace(&mut self.results[index], Vec::new()) } } impl Worker for ImmediateWorker { fn new() -> Result { Ok(ImmediateWorker::new_immediate()) } fn start(&mut self, data: RowData) -> Result<()> { self.start_immediate(data); Ok(()) } fn append_row(&mut self, row: (usize, Vec)) -> Result<()> { self.append_row_immediate(row); Ok(()) } fn get_result(&mut self, index: usize) -> Result> { Ok(self.get_result_immediate(index)) } } jpeg-decoder-0.1.22/src/worker/mod.rs010064400017500001750000000013151400303361400155240ustar 00000000000000mod immediate; mod multithreaded; #[cfg(not(any(target_arch = "asmjs", target_arch = "wasm32")))] pub use self::multithreaded::MultiThreadedWorker as PlatformWorker; #[cfg(any(target_arch = "asmjs", target_arch = "wasm32"))] pub use self::immediate::ImmediateWorker as PlatformWorker; use error::Result; use parser::Component; use std::sync::Arc; pub struct RowData { pub index: usize, pub component: Component, pub quantization_table: Arc<[u16; 64]>, } pub trait Worker: Sized { fn new() -> Result; fn start(&mut self, row_data: RowData) -> Result<()>; fn append_row(&mut self, row: (usize, Vec)) -> Result<()>; fn get_result(&mut self, index: usize) -> Result>; } jpeg-decoder-0.1.22/src/worker/multithreaded.rs010064400017500001750000000066121400303361400176050ustar 00000000000000//! This module implements per-component parallelism. //! It should be possible to implement per-row parallelism as well, //! which should also boost performance of grayscale images //! and allow scaling to more cores. //! However, that would be more complex, so we use this as a starting point. use decoder::MAX_COMPONENTS; use error::Result; use std::{mem, sync::mpsc::{self, Sender}}; use std::thread; use super::{RowData, Worker}; use super::immediate::ImmediateWorker; enum WorkerMsg { Start(RowData), AppendRow(Vec), GetResult(Sender>), } pub struct MultiThreadedWorker { senders: [Option>; MAX_COMPONENTS] } impl Worker for MultiThreadedWorker { fn new() -> Result { Ok(MultiThreadedWorker { senders: [None, None, None, None] }) } fn start(&mut self, row_data: RowData) -> Result<()> { // if there is no worker thread for this component yet, start one let component = row_data.index; if let None = self.senders[component] { let sender = spawn_worker_thread(component)?; self.senders[component] = Some(sender); } // we do the "take out value and put it back in once we're done" dance here // and in all other message-passing methods because there's not that many rows // and this should be cheaper than spawning MAX_COMPONENTS many threads up front let sender = mem::replace(&mut self.senders[component], None).unwrap(); sender.send(WorkerMsg::Start(row_data)).expect("jpeg-decoder worker thread error"); self.senders[component] = Some(sender); Ok(()) } fn append_row(&mut self, row: (usize, Vec)) -> Result<()> { let component = row.0; let sender = mem::replace(&mut self.senders[component], None).unwrap(); sender.send(WorkerMsg::AppendRow(row.1)).expect("jpeg-decoder worker thread error"); self.senders[component] = Some(sender); Ok(()) } fn get_result(&mut self, index: usize) -> Result> { let (tx, rx) = mpsc::channel(); let sender = mem::replace(&mut self.senders[index], None).unwrap(); sender.send(WorkerMsg::GetResult(tx)).expect("jpeg-decoder worker thread error"); Ok(rx.recv().expect("jpeg-decoder worker thread error")) } } fn spawn_worker_thread(component: usize) -> Result> { let thread_builder = thread::Builder::new().name(format!("worker thread for component {}", component)); let (tx, rx) = mpsc::channel(); thread_builder.spawn(move || { let mut worker = ImmediateWorker::new_immediate(); while let Ok(message) = rx.recv() { match message { WorkerMsg::Start(mut data) => { // we always set component index to 0 for worker threads // because they only ever handle one per thread and we don't want them // to attempt to access nonexistent components data.index = 0; worker.start_immediate(data); }, WorkerMsg::AppendRow(row) => { worker.append_row_immediate((0, row)); }, WorkerMsg::GetResult(chan) => { let _ = chan.send(worker.get_result_immediate(0)); break; }, } } })?; Ok(tx) }