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[package] edition = "2021" rust-version = "1.80" name = "gufo-jpeg" version = "0.2.0" build = false autolib = false autobins = false autoexamples = false autotests = false autobenches = false description = "Inspect JPEG image structure" readme = "README.md" license = "MPL-2.0 OR LGPL-2.1-or-later" repository = "https://github.com/gufo-rs/gufo" [lib] name = "gufo_jpeg" path = "src/lib.rs" [[example]] name = "jpeg-dump" path = "examples/jpeg-dump.rs" [dependencies.gufo-common] version = "0.2.0" [dependencies.jpeg-encoder] version = "0.6.0" optional = true [dependencies.thiserror] version = "2.0.3" [dependencies.tracing] version = "0.1" [features] default = [] encoder = ["dep:jpeg-encoder"] [lints.clippy] arithmetic_side_effects = "forbid" cast_possible_truncation = "forbid" cast_possible_wrap = "forbid" [lints.rust] unsafe_code = "forbid" gufo-jpeg-0.2.0/Cargo.toml.orig000064400000000000000000000006671046102023000144060ustar 00000000000000[package] name = "gufo-jpeg" description = "Inspect JPEG image structure" version.workspace = true license.workspace = true edition.workspace = true rust-version.workspace = true repository.workspace = true [lints] workspace = true [features] default = [] encoder = ["dep:jpeg-encoder"] [dependencies] jpeg-encoder = { workspace = true, optional = true } gufo-common.workspace = true tracing.workspace = true thiserror.workspace = true gufo-jpeg-0.2.0/LICENSE000064400000000000000000000000341046102023000125100ustar 00000000000000MPL-2.0 OR LGPL-2.1-or-latergufo-jpeg-0.2.0/LICENSE-LGPL-2.1000064400000000000000000000635361046102023000135620ustar 00000000000000 GNU LESSER GENERAL PUBLIC LICENSE Version 2.1, February 1999 Copyright (C) 1991, 1999 Free Software Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed. 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You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA Also add information on how to contact you by electronic and paper mail. You should also get your employer (if you work as a programmer) or your school, if any, to sign a "copyright disclaimer" for the library, if necessary. Here is a sample; alter the names: Yoyodyne, Inc., hereby disclaims all copyright interest in the library `Frob' (a library for tweaking knobs) written by James Random Hacker. , 1 April 1990 Ty Coon, President of Vice That's all there is to it! gufo-jpeg-0.2.0/LICENSE-MPL-2.0000064400000000000000000000405261046102023000134450ustar 00000000000000Mozilla Public License Version 2.0 ================================== 1. Definitions -------------- 1.1. "Contributor" means each individual or legal entity that creates, contributes to the creation of, or owns Covered Software. 1.2. "Contributor Version" means the combination of the Contributions of others (if any) used by a Contributor and that particular Contributor's Contribution. 1.3. "Contribution" means Covered Software of a particular Contributor. 1.4. "Covered Software" means Source Code Form to which the initial Contributor has attached the notice in Exhibit A, the Executable Form of such Source Code Form, and Modifications of such Source Code Form, in each case including portions thereof. 1.5. "Incompatible With Secondary Licenses" means (a) that the initial Contributor has attached the notice described in Exhibit B to the Covered Software; or (b) that the Covered Software was made available under the terms of version 1.1 or earlier of the License, but not also under the terms of a Secondary License. 1.6. "Executable Form" means any form of the work other than Source Code Form. 1.7. "Larger Work" means a work that combines Covered Software with other material, in a separate file or files, that is not Covered Software. 1.8. "License" means this document. 1.9. "Licensable" means having the right to grant, to the maximum extent possible, whether at the time of the initial grant or subsequently, any and all of the rights conveyed by this License. 1.10. "Modifications" means any of the following: (a) any file in Source Code Form that results from an addition to, deletion from, or modification of the contents of Covered Software; or (b) any new file in Source Code Form that contains any Covered Software. 1.11. "Patent Claims" of a Contributor means any patent claim(s), including without limitation, method, process, and apparatus claims, in any patent Licensable by such Contributor that would be infringed, but for the grant of the License, by the making, using, selling, offering for sale, having made, import, or transfer of either its Contributions or its Contributor Version. 1.12. "Secondary License" means either the GNU General Public License, Version 2.0, the GNU Lesser General Public License, Version 2.1, the GNU Affero General Public License, Version 3.0, or any later versions of those licenses. 1.13. "Source Code Form" means the form of the work preferred for making modifications. 1.14. "You" (or "Your") means an individual or a legal entity exercising rights under this License. For legal entities, "You" includes any entity that controls, is controlled by, or is under common control with You. For purposes of this definition, "control" means (a) the power, direct or indirect, to cause the direction or management of such entity, whether by contract or otherwise, or (b) ownership of more than fifty percent (50%) of the outstanding shares or beneficial ownership of such entity. 2. License Grants and Conditions -------------------------------- 2.1. Grants Each Contributor hereby grants You a world-wide, royalty-free, non-exclusive license: (a) under intellectual property rights (other than patent or trademark) Licensable by such Contributor to use, reproduce, make available, modify, display, perform, distribute, and otherwise exploit its Contributions, either on an unmodified basis, with Modifications, or as part of a Larger Work; and (b) under Patent Claims of such Contributor to make, use, sell, offer for sale, have made, import, and otherwise transfer either its Contributions or its Contributor Version. 2.2. Effective Date The licenses granted in Section 2.1 with respect to any Contribution become effective for each Contribution on the date the Contributor first distributes such Contribution. 2.3. Limitations on Grant Scope The licenses granted in this Section 2 are the only rights granted under this License. No additional rights or licenses will be implied from the distribution or licensing of Covered Software under this License. Notwithstanding Section 2.1(b) above, no patent license is granted by a Contributor: (a) for any code that a Contributor has removed from Covered Software; or (b) for infringements caused by: (i) Your and any other third party's modifications of Covered Software, or (ii) the combination of its Contributions with other software (except as part of its Contributor Version); or (c) under Patent Claims infringed by Covered Software in the absence of its Contributions. This License does not grant any rights in the trademarks, service marks, or logos of any Contributor (except as may be necessary to comply with the notice requirements in Section 3.4). 2.4. Subsequent Licenses No Contributor makes additional grants as a result of Your choice to distribute the Covered Software under a subsequent version of this License (see Section 10.2) or under the terms of a Secondary License (if permitted under the terms of Section 3.3). 2.5. Representation Each Contributor represents that the Contributor believes its Contributions are its original creation(s) or it has sufficient rights to grant the rights to its Contributions conveyed by this License. 2.6. Fair Use This License is not intended to limit any rights You have under applicable copyright doctrines of fair use, fair dealing, or other equivalents. 2.7. Conditions Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted in Section 2.1. 3. Responsibilities ------------------- 3.1. Distribution of Source Form All distribution of Covered Software in Source Code Form, including any Modifications that You create or to which You contribute, must be under the terms of this License. You must inform recipients that the Source Code Form of the Covered Software is governed by the terms of this License, and how they can obtain a copy of this License. You may not attempt to alter or restrict the recipients' rights in the Source Code Form. 3.2. Distribution of Executable Form If You distribute Covered Software in Executable Form then: (a) such Covered Software must also be made available in Source Code Form, as described in Section 3.1, and You must inform recipients of the Executable Form how they can obtain a copy of such Source Code Form by reasonable means in a timely manner, at a charge no more than the cost of distribution to the recipient; and (b) You may distribute such Executable Form under the terms of this License, or sublicense it under different terms, provided that the license for the Executable Form does not attempt to limit or alter the recipients' rights in the Source Code Form under this License. 3.3. Distribution of a Larger Work You may create and distribute a Larger Work under terms of Your choice, provided that You also comply with the requirements of this License for the Covered Software. If the Larger Work is a combination of Covered Software with a work governed by one or more Secondary Licenses, and the Covered Software is not Incompatible With Secondary Licenses, this License permits You to additionally distribute such Covered Software under the terms of such Secondary License(s), so that the recipient of the Larger Work may, at their option, further distribute the Covered Software under the terms of either this License or such Secondary License(s). 3.4. Notices You may not remove or alter the substance of any license notices (including copyright notices, patent notices, disclaimers of warranty, or limitations of liability) contained within the Source Code Form of the Covered Software, except that You may alter any license notices to the extent required to remedy known factual inaccuracies. 3.5. Application of Additional Terms You may choose to offer, and to charge a fee for, warranty, support, indemnity or liability obligations to one or more recipients of Covered Software. However, You may do so only on Your own behalf, and not on behalf of any Contributor. You must make it absolutely clear that any such warranty, support, indemnity, or liability obligation is offered by You alone, and You hereby agree to indemnify every Contributor for any liability incurred by such Contributor as a result of warranty, support, indemnity or liability terms You offer. You may include additional disclaimers of warranty and limitations of liability specific to any jurisdiction. 4. Inability to Comply Due to Statute or Regulation --------------------------------------------------- If it is impossible for You to comply with any of the terms of this License with respect to some or all of the Covered Software due to statute, judicial order, or regulation then You must: (a) comply with the terms of this License to the maximum extent possible; and (b) describe the limitations and the code they affect. Such description must be placed in a text file included with all distributions of the Covered Software under this License. Except to the extent prohibited by statute or regulation, such description must be sufficiently detailed for a recipient of ordinary skill to be able to understand it. 5. Termination -------------- 5.1. The rights granted under this License will terminate automatically if You fail to comply with any of its terms. However, if You become compliant, then the rights granted under this License from a particular Contributor are reinstated (a) provisionally, unless and until such Contributor explicitly and finally terminates Your grants, and (b) on an ongoing basis, if such Contributor fails to notify You of the non-compliance by some reasonable means prior to 60 days after You have come back into compliance. Moreover, Your grants from a particular Contributor are reinstated on an ongoing basis if such Contributor notifies You of the non-compliance by some reasonable means, this is the first time You have received notice of non-compliance with this License from such Contributor, and You become compliant prior to 30 days after Your receipt of the notice. 5.2. If You initiate litigation against any entity by asserting a patent infringement claim (excluding declaratory judgment actions, counter-claims, and cross-claims) alleging that a Contributor Version directly or indirectly infringes any patent, then the rights granted to You by any and all Contributors for the Covered Software under Section 2.1 of this License shall terminate. 5.3. In the event of termination under Sections 5.1 or 5.2 above, all end user license agreements (excluding distributors and resellers) which have been validly granted by You or Your distributors under this License prior to termination shall survive termination. ************************************************************************ * * * 6. Disclaimer of Warranty * * ------------------------- * * * * Covered Software is provided under this License on an "as is" * * basis, without warranty of any kind, either expressed, implied, or * * statutory, including, without limitation, warranties that the * * Covered Software is free of defects, merchantable, fit for a * * particular purpose or non-infringing. The entire risk as to the * * quality and performance of the Covered Software is with You. * * Should any Covered Software prove defective in any respect, You * * (not any Contributor) assume the cost of any necessary servicing, * * repair, or correction. This disclaimer of warranty constitutes an * * essential part of this License. No use of any Covered Software is * * authorized under this License except under this disclaimer. * * * ************************************************************************ ************************************************************************ * * * 7. Limitation of Liability * * -------------------------- * * * * Under no circumstances and under no legal theory, whether tort * * (including negligence), contract, or otherwise, shall any * * Contributor, or anyone who distributes Covered Software as * * permitted above, be liable to You for any direct, indirect, * * special, incidental, or consequential damages of any character * * including, without limitation, damages for lost profits, loss of * * goodwill, work stoppage, computer failure or malfunction, or any * * and all other commercial damages or losses, even if such party * * shall have been informed of the possibility of such damages. This * * limitation of liability shall not apply to liability for death or * * personal injury resulting from such party's negligence to the * * extent applicable law prohibits such limitation. Some * * jurisdictions do not allow the exclusion or limitation of * * incidental or consequential damages, so this exclusion and * * limitation may not apply to You. * * * ************************************************************************ 8. Litigation ------------- Any litigation relating to this License may be brought only in the courts of a jurisdiction where the defendant maintains its principal place of business and such litigation shall be governed by laws of that jurisdiction, without reference to its conflict-of-law provisions. Nothing in this Section shall prevent a party's ability to bring cross-claims or counter-claims. 9. Miscellaneous ---------------- This License represents the complete agreement concerning the subject matter hereof. If any provision of this License is held to be unenforceable, such provision shall be reformed only to the extent necessary to make it enforceable. Any law or regulation which provides that the language of a contract shall be construed against the drafter shall not be used to construe this License against a Contributor. 10. Versions of the License --------------------------- 10.1. New Versions Mozilla Foundation is the license steward. Except as provided in Section 10.3, no one other than the license steward has the right to modify or publish new versions of this License. Each version will be given a distinguishing version number. 10.2. Effect of New Versions You may distribute the Covered Software under the terms of the version of the License under which You originally received the Covered Software, or under the terms of any subsequent version published by the license steward. 10.3. Modified Versions If you create software not governed by this License, and you want to create a new license for such software, you may create and use a modified version of this License if you rename the license and remove any references to the name of the license steward (except to note that such modified license differs from this License). 10.4. Distributing Source Code Form that is Incompatible With Secondary Licenses If You choose to distribute Source Code Form that is Incompatible With Secondary Licenses under the terms of this version of the License, the notice described in Exhibit B of this License must be attached. Exhibit A - Source Code Form License Notice ------------------------------------------- This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of the MPL was not distributed with this file, You can obtain one at https://mozilla.org/MPL/2.0/. If it is not possible or desirable to put the notice in a particular file, then You may include the notice in a location (such as a LICENSE file in a relevant directory) where a recipient would be likely to look for such a notice. You may add additional accurate notices of copyright ownership. Exhibit B - "Incompatible With Secondary Licenses" Notice --------------------------------------------------------- This Source Code Form is "Incompatible With Secondary Licenses", as defined by the Mozilla Public License, v. 2.0. gufo-jpeg-0.2.0/README.md000064400000000000000000000005771046102023000127760ustar 00000000000000# Gufo JPEG ## Relevant Standards - [T.81 Digital compression and coding of continuous-tone still images: Requirements and guidelines](https://www.w3.org/Graphics/JPEG/itu-t81.pdf) - [T.871 JPEG-1 extensions: JPEG File Interchange Format (JFIF)](https://www.itu.int/rec/T-REC-T.871) - [T.872 JPEG-1 extensions: Application to printing systems](https://www.itu.int/rec/T-REC-T.872) gufo-jpeg-0.2.0/examples/jpeg-dump.rs000064400000000000000000000011431046102023000155610ustar 00000000000000use gufo_jpeg::Jpeg; fn main() { let path = std::env::args() .nth(1) .expect("First agument must be a file path."); let data = std::fs::read(path).unwrap(); let jpeg = Jpeg::new(data).unwrap(); for segment in jpeg.segments() { let data_init = segment .data() .iter() .take(50) .take_while(|x| **x != b'\0') .filter(|x| x.is_ascii_graphic()) .cloned() .collect::>(); let s = String::from_utf8_lossy(&data_init); println!("{:x?}: {s}", segment.marker()); } } gufo-jpeg-0.2.0/src/encoder.rs000064400000000000000000000067321046102023000142720ustar 00000000000000use gufo_common::math::*; use jpeg_encoder::QuantizationTableType; use crate::Error; impl crate::Jpeg { pub fn encoder( &self, w: W, ) -> Result, EncoderError> { let mut encoder = jpeg_encoder::Encoder::new(w, 100); let (luma, chroma) = self.quantization_tables()?; encoder.set_quantization_tables(luma, chroma); let progressive = self.is_progressive()?; encoder.set_progressive(progressive); if progressive { encoder.set_progressive_scans(self.n_sos().u8().map_err(|x| Error::from(x))?); } Ok(encoder) } pub fn sampling_factor(&self) -> Result { match self.color_model()?.color_type()? { jpeg_encoder::JpegColorType::Cmyk => { let parameters = self.components_specification_parameters(3)?; jpeg_encoder::SamplingFactor::from_factors(parameters.h, parameters.v) } jpeg_encoder::JpegColorType::Luma => Some(jpeg_encoder::SamplingFactor::F_1_1), jpeg_encoder::JpegColorType::Ycbcr => { let parameters = self.components_specification_parameters(0)?; jpeg_encoder::SamplingFactor::from_factors(parameters.h, parameters.v) } jpeg_encoder::JpegColorType::Ycck => { let parameters_0 = self.components_specification_parameters(0)?; let parameters_3 = self.components_specification_parameters(3)?; if parameters_0.h != parameters_3.h || parameters_0.v != parameters_3.v { return Err(EncoderError::UnsupportedSamplingFactor); } jpeg_encoder::SamplingFactor::from_factors(parameters_0.h, parameters_0.v) } } .ok_or(EncoderError::UnsupportedSamplingFactor) } pub fn quantization_tables( &self, ) -> Result< ( jpeg_encoder::QuantizationTableType, jpeg_encoder::QuantizationTableType, ), EncoderError, > { let dqts = self.dqts()?; let luma_parameters = self.components_specification_parameters(0)?; let luma_table = dqts.get(&luma_parameters.tq).ok_or(Error::MissingDqt)?; let luma = jpeg_encoder::QuantizationTableType::Custom(Box::new(luma_table.qk_ordered())); let chroma_parameters = self.components_specification_parameters(1)?; let chroma_table = dqts.get(&chroma_parameters.tq).ok_or(Error::MissingDqt)?; let chroma: QuantizationTableType = jpeg_encoder::QuantizationTableType::Custom(Box::new(chroma_table.qk_ordered())); Ok((luma, chroma)) } } impl crate::ColorModel { pub fn color_type(&self) -> Result { match self { Self::Cmyk => Ok(jpeg_encoder::JpegColorType::Cmyk), Self::Grayscale => Ok(jpeg_encoder::JpegColorType::Luma), Self::Rgb => Err(EncoderError::UnsupportedColorModel), Self::YCbCr => Ok(jpeg_encoder::JpegColorType::Ycbcr), Self::Ycck => Ok(jpeg_encoder::JpegColorType::Ycck), } } } #[derive(Debug, thiserror::Error)] pub enum EncoderError { #[error("{0}")] Gufo(#[from] crate::Error), #[error("Color model not supported by encoder")] UnsupportedColorModel, #[error("Sampling factor not supported by encoder")] UnsupportedSamplingFactor, } gufo-jpeg-0.2.0/src/lib.rs000064400000000000000000000364001046102023000134140ustar 00000000000000#![doc = include_str!("../README.md")] #[cfg(feature = "encoder")] mod encoder; mod segments; use std::collections::BTreeMap; use std::io::{Cursor, Read}; use std::ops::Range; use gufo_common::error::ErrorWithData; use gufo_common::math::*; use gufo_common::prelude::*; pub use segments::*; pub const EXIF_IDENTIFIER_STRING: &[u8] = b"Exif\0\0"; pub const XMP_IDENTIFIER_STRING: &[u8] = b"http://ns.adobe.com/xap/1.0/\0"; pub const MAGIC_BYTES: &[u8] = &[0xFF, 0xD8, 0xFF]; pub const MARKER_START: u8 = 0xFF; #[derive(Debug)] pub struct Jpeg { segments: Vec, data: Vec, } impl ImageFormat for Jpeg { fn is_filetype(data: &[u8]) -> bool { data.starts_with(MAGIC_BYTES) } } impl ImageMetadata for Jpeg { fn exif(&self) -> Vec> { self.exif_data().map(|x| x.to_vec()).collect() } fn xmp(&self) -> Vec> { self.exif_data().map(|x| x.to_vec()).collect() } } impl Jpeg { pub fn new(data: Vec) -> Result> { match Self::find_segments(&data) { Ok(segments) => Ok(Self { segments, data }), Err(err) => Err(ErrorWithData::new(err, data)), } } pub fn into_inner(self) -> Vec { self.data } /// List all segments in their order of appearance pub fn segments(&self) -> Vec { self.segments.iter().map(|x| x.segment(self)).collect() } /// List all segments with the given marker pub fn segments_marker(&self, marker: Marker) -> impl Iterator { self.segments .iter() .filter(move |x| x.marker == Some(marker)) .map(|x| x.segment(self)) } /// Quantization tables with `Tq` value as key pub fn dqts(&self) -> Result, Error> { let segments = self.segments(); let mut dqts = Vec::new(); for i in segments .into_iter() .filter(|x| x.marker == Some(Marker::DQT)) { let data = i.data(); dqts.push(Dqt::from_data(data)?); } let mut map = BTreeMap::new(); for dqt in dqts.into_iter().flatten() { map.insert(dqt.tq(), dqt); } Ok(map) } pub fn sof(&self) -> Result { let segment = self .segments() .into_iter() .find(|x| x.marker.map_or(false, |x| x.is_sof())) .ok_or(Error::NoSofSegmentFound)?; Sof::from_data(segment.data()) } pub fn is_progressive(&self) -> Result { let sof_marker = self .segments() .into_iter() .flat_map(|x| x.marker()) .find(|x| x.is_sof()) .ok_or(Error::NoSofSegmentFound)?; sof_marker.is_progressive_sof() } /// Number of SOS segments /// /// For `is_progressive()` being true, this is the number of scans. pub fn n_sos(&self) -> usize { self.segments() .into_iter() .filter(|x| matches!(x.marker, Some(Marker::SOS))) .count() } pub fn sos(&self) -> Result { let segment = self .segment_by_marker(Marker::SOS) .ok_or(Error::NoSosSegmentFound)?; Sos::from_data(segment.data()) } pub fn components_specification_parameters( &self, component: usize, ) -> Result { let cs = self .sos()? .components_specifications .get(component) .ok_or(Error::MissingComponentSpecification)? .cs; self.sof()? .parameters .iter() .find(|x| x.c == cs) .ok_or(Error::MissingComponentSpecificationParameters) .cloned() } pub fn color_model(&self) -> Result { let sos = self.sos()?; let n_components = sos.components_specifications.len(); if let Some(app14) = self.segment_by_marker(Marker::APP14) { if app14.data().starts_with(b"Adobe\0") { if let Some(color_model) = app14.data().get(11) { return match *color_model { 0 if n_components == 4 => Ok(ColorModel::Cmyk), 0 if n_components == 3 => Ok(ColorModel::Rgb), 1 => Ok(ColorModel::YCbCr), 2 => Ok(ColorModel::Ycck), _ => Err(Error::UnknownColorModel), }; } } } match n_components { 1 => Ok(ColorModel::Grayscale), 3 => Ok(ColorModel::YCbCr), _ => Err(Error::UnknownColorModel), } } pub fn segment_by_marker(&self, marker: Marker) -> Option { self.segments .iter() .find(|x| x.marker == Some(marker)) .map(|x| x.segment(self)) } pub fn exif_segments(&self) -> impl Iterator { self.segments_marker(Marker::APP1) .filter(|x| x.data().starts_with(EXIF_IDENTIFIER_STRING)) } pub fn exif_data(&self) -> impl Iterator { self.exif_segments() .filter_map(|x| x.data().get(EXIF_IDENTIFIER_STRING.len()..)) } pub fn xmp_segments(&self) -> impl Iterator { self.segments_marker(Marker::APP1) .filter(|x| x.data().starts_with(XMP_IDENTIFIER_STRING)) } pub fn xmp_data(&self) -> impl Iterator { self.xmp_segments() .filter_map(|x| x.data().get(XMP_IDENTIFIER_STRING.len()..)) } fn find_segments(data: &[u8]) -> Result, Error> { let mut cur = Cursor::new(data); let buf = &mut [0; 2]; cur.read_exact(buf).map_err(|_| Error::UnexpectedEof)?; if data.get(..MAGIC_BYTES.len()) != Some(MAGIC_BYTES) { return Err(Error::InvalidMagicBytes(*buf)); } let mut segments = Vec::new(); segments.push(RawSegment { marker: Some(Marker::SOI), data: 2..2, }); let mut entropy_coded_segment = false; let byte = &mut [0; 1]; loop { if entropy_coded_segment { let data_start = cur.position().usize()?; loop { cur.read_exact(byte).map_err(|_| Error::UnexpectedEof)?; if byte == &[MARKER_START] { cur.read_exact(byte).map_err(|_| Error::UnexpectedEof)?; if byte == &[0] { continue; } else { let data_end = cur.position().safe_sub(2)?.usize()?; segments.push(RawSegment { marker: None, data: data_start..data_end, }); break; } } } } else { // Read tag cur.read_exact(byte).map_err(|_| Error::UnexpectedEof)?; if byte != &[MARKER_START] { return Err(Error::ExpectedMarkerStart(buf[0])); } cur.read_exact(byte).map_err(|_| Error::UnexpectedEof)?; tracing::debug!("Found tag {byte:0>2X?}"); } let marker = Marker::from(byte[0]); let len_start = cur.position(); let (data_start, len) = if marker.is_standalone() { (len_start.usize()?, 0) } else { // Read length. The length includes the two length bytes, but not the marker. cur.read_exact(buf).map_err(|_| Error::UnexpectedEof)?; (len_start.usize()?.safe_add(2)?, u16::from_be_bytes(*buf)) }; let data_end = len_start.usize()?.safe_add(len.into())?; let segment = RawSegment { marker: Some(marker), data: data_start..data_end, }; tracing::debug!("Found segment {segment:?}"); segments.push(segment); if marker == Marker::EOI { break; } else if marker == Marker::SOS { entropy_coded_segment = true; } cur.set_position(len_start.safe_add(len.into())?); } Ok(segments) } pub fn replace_segment( &mut self, old_segment: RawSegment, new_segment: NewSegment, ) -> Result<(), Error> { let old_range = old_segment.complete_data(); let mut new = Vec::new(); new.extend_from_slice(&self.data[..old_range.start]); new_segment.write_to(&mut new); new.extend_from_slice(&self.data[old_range.end..]); self.data = new; self.segments = Self::find_segments(&self.data)?; Ok(()) } /// Replaces this PNG's image data with those from another /// /// Keeps all the metadata from this image but replaces the `IHDR` and /// `IDAT` chunks with the ones from `other`. pub fn replace_image_data(&mut self, other: &Self) -> Result<(), Error> { let mut buf = Vec::with_capacity(other.data.len()); buf.extend_from_slice(&MAGIC_BYTES[0..2]); for segment in &self.segments { if segment.marker.map_or(false, |x| x.is_metadata()) { buf.extend_from_slice(&self.data[segment.complete_data()]); } } for segment in &other.segments { if !matches!(segment.marker, Some(Marker::SOI)) { buf.extend_from_slice(&other.data[segment.complete_data()]); } } self.segments = Self::find_segments(&buf).unwrap(); self.data = buf; Ok(()) } } #[derive(Debug)] pub struct NewSegment<'a> { marker: Marker, data: &'a [u8], total_len: u16, } impl<'a> NewSegment<'a> { pub fn new(marker: Marker, data: &'a [u8]) -> Result { let total_len = data.len().u16()?.safe_add(2)?; Ok(Self { marker, data, total_len, }) } pub fn write_to(&self, vec: &mut Vec) { vec.push(MARKER_START); vec.push(self.marker.into()); vec.extend_from_slice(&self.total_len.to_be_bytes()); vec.extend_from_slice(self.data); } } #[derive(Debug)] pub struct RawSegment { marker: Option, data: Range, } impl RawSegment { pub fn segment<'a>(&self, jpeg: &'a Jpeg) -> Segment<'a> { Segment { marker: self.marker, data: self.data.clone(), jpeg, } } /// Complete segment including marker and length pub fn complete_data(&self) -> Range { let sub = if self.marker.is_some() { 4 } else { 0 }; self.data .start .checked_sub(sub) .expect("Unreachable: Marker and length fields always exist")..self.data.end } } #[derive(Clone, Debug)] pub struct Segment<'a> { marker: Option, data: Range, jpeg: &'a Jpeg, } impl<'a> Segment<'a> { pub fn marker(&self) -> Option { self.marker } pub fn data_pos(&self) -> usize { self.data.start } pub fn data(&self) -> &'a [u8] { self.jpeg .data .get(self.data.clone()) .expect("Unreachable: This data must exist after successful loading") } pub fn unsafe_raw_segment(self) -> RawSegment { RawSegment { data: self.data, marker: self.marker, } } } #[derive(Debug, Clone, thiserror::Error)] pub enum Error { #[error("Invalid magic bytes: {0:x?}")] InvalidMagicBytes([u8; 2]), #[error("Unexpected end of file")] UnexpectedEof, #[error("Expected marker start: {0:x}")] ExpectedMarkerStart(u8), #[error("Math error: {0}")] Math(#[from] MathError), #[error("Unknown uantization table element precision {0}")] UnknownPq(u8), #[error("No SOS segment found")] NoSosSegmentFound, #[error("No SOF segment found")] NoSofSegmentFound, #[error("Couldn't detemine a color model")] UnknownColorModel, #[error("Missing component specification")] MissingComponentSpecification, #[error("Missing component specification parameters")] MissingComponentSpecificationParameters, #[error("Missing quantization table")] MissingDqt, } gufo_common::utils::convertible_enum!( #[repr(u8)] #[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord)] #[non_exhaustive] /// Segment marker pub enum Marker { TEM = 0x01, SOF0 = 0xC0, SOF1 = 0xC1, SOF2 = 0xC2, /// Define Huffman table DHT = 0xC4, RST0 = 0xD0, RST1 = 0xD1, RST2 = 0xD2, RST3 = 0xD3, RST4 = 0xD4, RST5 = 0xD5, RST6 = 0xD6, RST7 = 0xD7, /// Start of image SOI = 0xD8, /// End of image EOI = 0xD9, /// Start of scan SOS = 0xDA, /// Define quantization table(s) DQT = 0xDB, APP0 = 0xE0, /// Exif, XMP APP1 = 0xE1, /// ICC color profile APP2 = 0xE2, APP3 = 0xE3, APP4 = 0xE4, APP5 = 0xE5, APP6 = 0xE6, APP7 = 0xE7, APP8 = 0xE8, APP9 = 0xE9, APP10 = 0xEA, APP11 = 0xEB, APP12 = 0xEC, APP13 = 0xED, APP14 = 0xEE, APP15 = 0xEF, /// Define Restart Interval DRI = 0xDD, JPG0 = 0xF0, JPG1 = 0xF1, JPG2 = 0xF2, JPG3 = 0xF3, JPG4 = 0xF4, JPG5 = 0xF5, JPG6 = 0xF6, JPG7 = 0xF7, JPG8 = 0xF8, JPG9 = 0xF9, JPG10 = 0xFA, JPG11 = 0xFB, JPG12 = 0xFC, JPG13 = 0xFD, /// Comment COM = 0xFE, } ); impl Marker { pub fn is_standalone(&self) -> bool { matches!( self, Self::RST0 | Self::RST1 | Self::RST2 | Self::RST3 | Self::RST4 | Self::RST5 | Self::RST6 | Self::RST7 | Self::SOI | Self::EOI ) } pub fn is_sof(&self) -> bool { matches!(self, Self::SOF0 | Self::SOF1 | Self::SOF2) } pub fn is_progressive_sof(&self) -> Result { match self { Self::SOF0 | Self::SOF1 => Ok(false), Self::SOF2 => Ok(true), _ => Err(Error::NoSofSegmentFound), } } pub fn is_metadata(&self) -> bool { matches!( self, Self::COM | Self::APP0 | Self::APP1 | Self::APP2 | Self::APP3 | Self::APP4 | Self::APP5 | Self::APP6 | Self::APP7 | Self::APP8 | Self::APP9 | Self::APP10 | Self::APP11 | Self::APP12 | Self::APP13 | Self::APP14 | Self::APP15 ) } } #[derive(Debug)] pub enum ColorModel { Grayscale, YCbCr, Cmyk, Rgb, Ycck, } gufo-jpeg-0.2.0/src/segments.rs000064400000000000000000000163401046102023000144740ustar 00000000000000use std::io::Read; use super::Error; #[derive(Debug)] pub struct Dqt_ { /// Quantization table destination identifier tq: u8, /// Quantization table elements qk: [T; 64], } /// Quantization Table #[derive(Debug)] pub enum Dqt { /// Table definition with 8 bit elements Dqt8(Dqt_), /// Table definition with 16 bit elements Dqt16(Dqt_), } impl Dqt { pub fn tq(&self) -> u8 { match self { Self::Dqt8(x) => x.tq, Self::Dqt16(x) => x.tq, } } /// Quantization table elements in 16 bit /// /// This resturns the data in 16 bit, even if defined as 8 bit. The 8-bit /// data is not scaled to 16-bit. pub fn qk(&self) -> [u16; 64] { match self { Self::Dqt8(dqt) => { let mut qk = [0; 64]; for (n, i) in dqt.qk.into_iter().enumerate() { qk[n] = i.into(); } qk } Self::Dqt16(dqt) => dqt.qk, } } /// Quantization table in non-zig-zag order /// /// Otherwise same as `qk()` pub fn qk_ordered(&self) -> [u16; 64] { const IDX: [[usize; 8]; 8] = [ [0, 1, 5, 6, 14, 15, 27, 28], [2, 4, 7, 13, 16, 26, 29, 42], [3, 8, 12, 17, 25, 30, 41, 43], [9, 11, 18, 24, 31, 40, 44, 53], [10, 19, 23, 32, 39, 45, 52, 54], [20, 22, 33, 38, 46, 51, 55, 60], [21, 34, 37, 47, 50, 56, 59, 61], [35, 36, 48, 49, 57, 58, 62, 63], ]; let qk = self.qk(); let mut qk_ordered = [0; 64]; for (i, n) in IDX.into_iter().flatten().enumerate() { qk_ordered[i] = qk[n]; } qk_ordered } pub fn from_data(mut value: &[u8]) -> Result, Error> { let mut dqts = Vec::new(); while !value.is_empty() { let mut pq_tq = [0; 1]; value .read_exact(&mut pq_tq) .map_err(|_| Error::UnexpectedEof)?; let pq_tq = pq_tq[0]; let pq = pq_tq >> 4; let tq = pq_tq & 0b1111; tracing::debug!("Loading DQT entry with Pq={pq}, Tq={tq}"); // Matrix entries can be 8bit and 16bit precision match pq { 0 => { let mut qk = [0; 64]; value .read_exact(&mut qk) .map_err(|_| Error::UnexpectedEof)?; dqts.push(Self::Dqt8(Dqt_ { tq, qk })) } 1 => { let mut qk_raw = [0; 64 * 2]; value .read_exact(&mut qk_raw) .map_err(|_| Error::UnexpectedEof)?; let mut qk = [0; 64]; for (n, i) in qk_raw.chunks_exact(2).enumerate() { let entry = u16::from_be_bytes(i.try_into().unwrap()); qk[n] = entry; } dqts.push(Self::Dqt16(Dqt_ { tq, qk })) } unkown_pq => return Err(Error::UnknownPq(unkown_pq)), } } Ok(dqts) } } /// Frame Header / Start of Frame #[derive(Debug)] pub struct Sof { /// Sample precision pub p: u8, /// Number of lines pub y: u16, /// Number of samples per line pub x: u16, /// Component specification parameters pub parameters: Vec, } impl Sof { pub fn from_data(mut data: &[u8]) -> Result { let p = data.read_u8().map_err(|_| Error::UnexpectedEof)?; let y = data.read_be_u16().map_err(|_| Error::UnexpectedEof)?; let x = data.read_be_u16().map_err(|_| Error::UnexpectedEof)?; let nf = data.read_u8().map_err(|_| Error::UnexpectedEof)?; let mut parameters = Vec::with_capacity(nf as usize); let buf = &mut [0; 3]; for _ in 0..nf { data.read_exact(buf).map_err(|_| Error::UnexpectedEof)?; parameters.push(ComponentSpecificationParameters::from_data(buf)?); } Ok(Self { p, y, x, parameters, }) } } /// Component specification parameters #[derive(Debug, Clone, Copy)] pub struct ComponentSpecificationParameters { /// Component identifier pub c: u8, /// Horizontal sampling factor pub h: u8, /// Vertical sampling factor pub v: u8, /// Quantization table destination selector pub tq: u8, } impl ComponentSpecificationParameters { pub fn from_data(mut data: &[u8]) -> Result { let c = data.read_u8().map_err(|_| Error::UnexpectedEof)?; let h_v = data.read_u8().map_err(|_| Error::UnexpectedEof)?; let tq = data.read_u8().map_err(|_| Error::UnexpectedEof)?; let h = h_v >> 4; let v = h_v & 0b1111; Ok(Self { c, h, v, tq }) } } pub trait ReadExt: Read { fn read_u8(&mut self) -> std::io::Result { let buf = &mut [0; 1]; self.read_exact(buf)?; Ok(buf[0]) } fn read_be_u16(&mut self) -> std::io::Result { let buf = &mut [0; 2]; self.read_exact(buf)?; Ok(u16::from_be_bytes(*buf)) } } impl ReadExt for T {} /// Scan Header / Start of Scan #[derive(Debug)] pub struct Sos { /// List of components (channels) pub components_specifications: Vec, /// Start of spectral or predictor selection pub ss: u8, /// End of spectral selection pub se: u8, /// Successive approximation bit position high pub ah: u8, /// Successive approximation bit position low or point transform pub al: u8, } impl Sos { pub fn from_data(mut data: &[u8]) -> Result { let ns = data.read_u8().map_err(|_| Error::UnexpectedEof)?; let mut components_specifications = Vec::with_capacity(ns as usize); let buf = &mut [0; 2]; for _ in 0..ns { data.read_exact(buf).map_err(|_| Error::UnexpectedEof)?; components_specifications.push(ComponentSpecification::from_data(buf)?); } let ss = data.read_u8().map_err(|_| Error::UnexpectedEof)?; let se = data.read_u8().map_err(|_| Error::UnexpectedEof)?; let ah_al = data.read_u8().map_err(|_| Error::UnexpectedEof)?; let ah = ah_al >> 4; let al = ah_al & 0b1111; Ok(Self { components_specifications, ss, se, ah, al, }) } } #[derive(Debug)] pub struct ComponentSpecification { /// Scan component selector /// /// References a `c` value in /// `ComponentSpecificationParameters`](ComponentSpecificationParameters# /// structfield.c). pub cs: u8, /// DC entropy coding table pub td: u8, /// AC entropy coding table pub ta: u8, } impl ComponentSpecification { pub fn from_data(mut data: &[u8]) -> Result { let cs = data.read_u8().map_err(|_| Error::UnexpectedEof)?; let td_ta = data.read_u8().map_err(|_| Error::UnexpectedEof)?; let td = td_ta >> 4; let ta = td_ta & 0b1111; Ok(Self { cs, td, ta }) } }