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[package] edition = "2021" rust-version = "1.80" name = "gufo-png" version = "0.3.0-beta" build = false autolib = false autobins = false autoexamples = false autotests = false autobenches = false description = "Data structure for PNG images." readme = "README.md" license = "MPL-2.0 OR LGPL-2.1-or-later" repository = "https://github.com/gufo-rs/gufo" [lib] name = "gufo_png" path = "src/lib.rs" [[example]] name = "png-dump" path = "examples/png-dump.rs" [dependencies.crc32fast] version = "1.2.0" [dependencies.encoding_rs] version = "0.8.35" [dependencies.gufo-common] version = "1.0.0-beta" [dependencies.hex] version = "0.4.0" [dependencies.miniz_oxide] version = "0.8.0" [dependencies.thiserror] version = "2.0.3" [lints.clippy] arithmetic_side_effects = "forbid" cast_possible_truncation = "forbid" cast_possible_wrap = "forbid" [lints.rust] unsafe_code = "forbid" gufo-png-0.3.0-beta/Cargo.toml.orig000064400000000000000000000006261046102023000151520ustar 00000000000000[package] name = "gufo-png" description = "Data structure for PNG images." version.workspace = true license.workspace = true edition.workspace = true rust-version.workspace = true repository.workspace = true [dependencies] crc32fast.workspace = true gufo-common.workspace = true miniz_oxide.workspace = true hex.workspace = true thiserror.workspace = true encoding_rs = "0.8.35" [lints] workspace = true gufo-png-0.3.0-beta/LICENSE000064400000000000000000000000341046102023000132610ustar 00000000000000MPL-2.0 OR LGPL-2.1-or-latergufo-png-0.3.0-beta/LICENSE-LGPL-2.1000064400000000000000000000635361046102023000143330ustar 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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To apply these terms, attach the following notices to the library. It is safest to attach them to the start of each source file to most effectively convey the exclusion of warranty; and each file should have at least the "copyright" line and a pointer to where the full notice is found. exif-inplace Copyright (C) 2023 Sophie Herold This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. 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-png-0.3.0-beta/LICENSE-MPL-2.0000064400000000000000000000405261046102023000142160ustar 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-png-0.3.0-beta/README.md000064400000000000000000000002251046102023000135350ustar 00000000000000# Gufo PNG ## Relevant Standards - [Portable Network Graphics (PNG) Specification (Third Edition)](https://www.w3.org/TR/2024/CRD-png-3-20240718/) gufo-png-0.3.0-beta/examples/png-dump.rs000064400000000000000000000032621046102023000161750ustar 00000000000000use gufo_png::{ChunkType, Png}; fn main() { let path = std::env::args() .nth(1) .expect("First agument must be a path."); let data = std::fs::read(path).unwrap(); let png = Png::new(data).unwrap(); for chunk in png.chunks() { match chunk.chunk_type() { ChunkType::Unknown(unknown) => println!( "Unknown({})", String::from_utf8_lossy(&u32::to_be_bytes(unknown)) ), chunk_type => println!("{chunk_type:?}"), } match chunk.chunk_type() { ChunkType::tEXt => { let (keyword, text) = chunk.text().unwrap(); println!( " {}:\n{}\n", String::from_utf8_lossy(keyword), String::from_utf8_lossy(text) ); } ChunkType::iTXt => { let itxt = chunk.itxt().unwrap(); println!( " {} ({}: {}):\n{}\n", String::from_utf8_lossy(itxt.keyword), String::from_utf8_lossy(itxt.language), itxt.translated_keyword, itxt.text ); } ChunkType::zTXt => { let (keyword, data) = chunk.ztxt(usize::MAX).unwrap(); println!( " {}:\n{}\n", String::from_utf8_lossy(keyword), String::from_utf8_lossy(&data[..15]) ); } ChunkType::eXIf => { println!(" {}\n", String::from_utf8_lossy(&chunk.chunk_data()[..2])); } _ => (), } } } gufo-png-0.3.0-beta/src/chunk.rs000064400000000000000000000220361046102023000145270ustar 00000000000000use std::borrow::Cow; use std::io::{Cursor, Read, Seek}; use std::ops::Range; use gufo_common::read::{ReadExt, SliceExt}; pub use crate::*; pub const LEGACY_EXIF_KEYWORD: &[u8] = b"Raw profile type exif"; pub const LEGACY_XMP_KEYWORD: &[u8] = b"Raw profile type xmp"; pub const XMP_KEYWORD: &[u8] = b"XML:com.adobe.xmp"; #[derive(Debug)] pub struct Chunk<'a> { pub(crate) raw_chunk: RawChunk, pub(crate) png: &'a Png, } impl<'a> Chunk<'a> { pub fn chunk_type(&self) -> ChunkType { self.raw_chunk.chunk_type } pub fn chunk_data(&self) -> &'a [u8] { self.png .data .get(self.raw_chunk.chunk_data.clone()) .expect("Unreachable: The chunk must be part of the data") } pub fn complete_data(&self) -> &[u8] { self.png .data .get(self.raw_chunk.chunk_complete.clone()) .expect("Unreachable: The chunk must be part of the data") } pub fn crc(&self) -> &[u8] { &self.raw_chunk.crc } pub fn keyword(&self) -> Result<&[u8], Error> { let data = self.chunk_data(); let keyword_length = data.iter().take_while(|x| **x != 0).count(); data.get(..keyword_length) .ok_or(Error::UnexpectedEndOfChunkData) } /// Returns the contents of an [`iTXt`](ChunkType::iTXt) chunk pub fn itxt(&self) -> Result { let mut cur = Cursor::new(self.chunk_data()); let keyword = cur.slice_until(b'\0')?; let compression = cur.read_byte()?; let _compression_method = cur.read_byte()?; let language = cur.slice_until(b'\0')?; let translated_keyword = String::from_utf8_lossy(cur.slice_until(b'\0')?); let raw_text = cur.slice_to_end()?; let text = if compression == 1 { Cow::Owned( String::from_utf8_lossy( &miniz_oxide::inflate::decompress_to_vec_zlib_with_limit(raw_text, 10000000) .map_err(Error::Zlib)?, ) .to_string(), ) } else { String::from_utf8_lossy(raw_text) }; Ok(Itxt { keyword, language, translated_keyword, text, }) } /// Returns keyword and value of a [`tEXt`](ChunkType::tEXt) chunk pub fn text(&self) -> Result<(&[u8], &[u8]), Error> { let keyword = self.keyword()?; let data_start = keyword .len() .checked_add(1) .ok_or(Error::PositionTooLarge)?; let text = self .chunk_data() .get(data_start..) .ok_or(Error::UnexpectedEndOfChunkData)?; Ok((keyword, text)) } /// Returns the content of a [`zTXt`](ChunkType::zTXt) chunk /// /// The first value is the keyword, the second is the decompressed data. pub fn ztxt(&self, inflate_limit: usize) -> Result<(&[u8], Vec), Error> { let (keyword, raw) = self.text()?; // Skip byte for compression type let raw = raw.get(1..).ok_or(Error::UnexpectedEndOfChunkData)?; let data = miniz_oxide::inflate::decompress_to_vec_zlib_with_limit(raw, inflate_limit) .map_err(Error::Zlib)?; Ok((keyword, data)) } /// Returns the content of a [`tEXt`](ChunkType::tEXt) or /// [`zTXt`](ChunkType::zTXt) chunk /// /// The first value is the keyword, the second is the decompressed data. pub fn textual(&self, inflate_limit: usize) -> Result<(&[u8], Vec), Error> { match self.chunk_type() { ChunkType::tEXt => self.text().map(|(k, v)| (k, v.to_vec())), ChunkType::zTXt => self.ztxt(inflate_limit), _ => Err(Error::NotTextualChunk), } } /// XMP data /// /// XMP data stored in accordance with XMP Specification Part 3: Storage in /// Files, Section 1.1.5 pub fn xmp(&self) -> Result>, Error> { if self.chunk_type() == ChunkType::iTXt && self.keyword()? == XMP_KEYWORD { return Ok(Some(self.itxt()?.text)); } Ok(None) } /// Returns the XMP data stored in a [`tEXt`](ChunkType::tEXt) or /// [`zTXt`](ChunkType::zTXt) chunk pub fn legacy_xmp(&self, inflate_limit: usize) -> Option> { if self.keyword().ok()? != LEGACY_XMP_KEYWORD { return None; } let (_, raw) = self.textual(inflate_limit).ok()?; let mut cur = Cursor::new(&raw); // Skip whitespaces skip_while(&mut cur, |x| x.is_ascii_whitespace()).ok()?; let xmp = &mut [0; 3]; cur.read_exact(xmp).ok()?; if xmp != b"xmp" { return None; } // Skip whitespaces skip_while(&mut cur, |x| x.is_ascii_whitespace()).ok()?; // Skip numbers (data length) skip_while(&mut cur, |x| x.is_ascii_digit()).ok()?; // Skip whitespaces skip_while(&mut cur, |x| x.is_ascii_whitespace()).ok()?; // Data without whitespaces let data = raw .iter() .skip(cur.position().try_into().ok()?) .filter(|c| !c.is_ascii_whitespace()) .cloned() .collect::>(); // Decode data from hex hex::decode(data).ok() } /// Returns the Exif data stored in a [`tEXt`](ChunkType::tEXt) or /// [`zTXt`](ChunkType::zTXt) chunk pub fn legacy_exif(&self, inflate_limit: usize) -> Option> { if self.keyword().ok()? != LEGACY_EXIF_KEYWORD { return None; } let (_, raw) = self.textual(inflate_limit).ok()?; let mut cur = Cursor::new(&raw); // Skip whitespaces skip_while(&mut cur, |x| x.is_ascii_whitespace()).ok()?; let exif = &mut [0; 4]; cur.read_exact(exif).ok()?; if exif != b"exif" { return None; } // Skip whitespaces skip_while(&mut cur, |x| x.is_ascii_whitespace()).ok()?; // Skip numbers (data length) skip_while(&mut cur, |x| x.is_ascii_digit()).ok()?; // Skip whitespaces skip_while(&mut cur, |x| x.is_ascii_whitespace()).ok()?; // Data without whitespaces let data = raw .iter() .skip(cur.position().try_into().ok()?) .filter(|c| !c.is_ascii_whitespace()) .cloned() .collect::>(); // Decode data from hex let exif_with_prefix = hex::decode(data).ok()?; // Drop header exif_with_prefix .strip_prefix(b"Exif\0\0") .map(|x| x.to_vec()) } pub fn unsafe_raw_chunk(self) -> RawChunk { self.raw_chunk } } // Moves cursor in front of the first element that does not fulfill the // predicate fn skip_while( cur: &mut Cursor<&Vec>, predicate: impl Fn(u8) -> bool, ) -> Result<(), std::io::Error> { let c: &mut [u8; 1] = &mut [0]; loop { cur.read_exact(c)?; if !predicate(c[0]) { break; } } cur.seek(std::io::SeekFrom::Current(-1))?; Ok(()) } #[derive(Debug, Clone)] pub struct RawChunk { pub(crate) chunk_type: ChunkType, pub(crate) chunk_data: Range, pub(crate) chunk_complete: Range, pub(crate) crc: [u8; 4], } impl RawChunk { pub(crate) fn chunk<'a>(&self, png: &'a Png) -> Chunk<'a> { Chunk { raw_chunk: self.clone(), png, } } pub fn complete_data(&self) -> Range { (self .chunk_data .start .checked_sub(8) .expect("Unreachable: The chunk type and size must be part of the data")) ..(self .chunk_data .end .checked_add(4) .expect("Unreachable: The CBC musst be part of the data")) } pub fn total_len(&self) -> usize { self.complete_data().len() } } pub struct Itxt<'a> { pub keyword: &'a [u8], pub language: &'a [u8], pub translated_keyword: Cow<'a, str>, pub text: Cow<'a, str>, } pub struct NewChunk { chunk_type: ChunkType, data: Vec, } impl NewChunk { pub fn new(chunk_type: ChunkType, data: Vec) -> NewChunk { NewChunk { chunk_type, data } } /// Create new tEXt chunk pub fn text(keyword: &str, text: &str) -> NewChunk { let mut text_encoded = vec![0; text.len()]; let len = encoding_rs::mem::convert_utf8_to_latin1_lossy(text.as_bytes(), &mut text_encoded); text_encoded.truncate(len); let mut data = keyword.as_bytes().to_vec(); data.push(0); data.extend(text_encoded); NewChunk { chunk_type: ChunkType::tEXt, data, } } pub fn to_bytes(&self) -> Vec { let mut buf = Vec::with_capacity(self.data.len()); buf.extend((self.data.len() as u32).to_be_bytes()); buf.extend(self.chunk_type.bytes()); buf.extend(&self.data); let crc = crc32fast::hash(&buf[4..]); buf.extend(crc.to_be_bytes()); buf } } gufo-png-0.3.0-beta/src/chunk_type.rs000064400000000000000000000042241046102023000155670ustar 00000000000000use std::fmt::Debug; gufo_common::utils::convertible_enum!( #[repr(u32)] #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord)] #[non_exhaustive] #[allow(non_camel_case_types)] /// Type of a chunk /// /// The value is stored as big endian [`u32`] of the original byte string. pub enum ChunkType { /// Header IHDR = b(b"IHDR"), /// Image Data IDAT = b(b"IDAT"), /// End of file IEND = b(b"IEND"), /// Color palette used in this image PLTE = b(b"PLTE"), /// Background Color bKGD = b(b"bKGD"), /// Primary chromaticities cHRM = b(b"cHRM"), /// Exif eXIf = b(b"eXIf"), /// Embedded ICC profile iCCP = b(b"iCCP"), /// Coding-independent code points cICP = b(b"cICP"), /// Apple proprietary, information for faster image loading /// /// See iDOT = b(b"iDOT"), /// International textual data iTXt = b(b"iTXt"), /// Physical pixel dimensions pHYs = b(b"pHYs"), /// Image uses sRGB color space with the given rendering intent sRGB = b(b"sRGB"), /// Textual information tEXt = b(b"tEXt"), /// Image last-modification time tIME = b(b"tIME"), /// Compressed textual data zTXt = b(b"zTXt"), } ); impl Debug for ChunkType { fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { let bytes = self.bytes(); let name = String::from_utf8(bytes.to_vec()) .ok() .and_then(|x| bytes.is_ascii().then_some(x)) .unwrap_or_else(|| >::into(*self).to_string()); match self { Self::Unknown(_) => write!(f, "Unknown({name:?})"), _ => f.write_str(&name), } } } impl ChunkType { /// Returns the byte string of the chunk pub fn bytes(self) -> [u8; 4] { u32::to_be_bytes(self.into()) } } /// Convert bytes to u32 const fn b(d: &[u8; 4]) -> u32 { u32::from_be_bytes(*d) } gufo-png-0.3.0-beta/src/error.rs000064400000000000000000000016021046102023000145440ustar 00000000000000use std::ops::Range; use gufo_common::read::ReadError; use miniz_oxide::inflate::DecompressError; #[derive(Debug, thiserror::Error)] pub enum Error { #[error("Unexpected end of file")] UnexpectedEof, #[error("Read Error: {0}")] Read(#[from] ReadError), #[error("Invalid magic bytes: {0:x?}")] InvalidMagicBytes(Vec), #[error("Position too large")] PositionTooLarge, #[error("Unexpected end of chunk data")] UnexpectedEndOfChunkData, #[error("Zlib decompression error: {0}")] Zlib(DecompressError), #[error("Data don't contain a single IDAT (image data) chunk.")] NoIdatChunk, #[error("Data don't contain a IHDR (header) chunk.")] NoIhdrChunk, #[error("The requested range '{0:?}' is not part of the image data")] IndexNotInData(Range), #[error("The chunk is not of type zTXt or tEXt")] NotTextualChunk, } gufo-png-0.3.0-beta/src/lib.rs000064400000000000000000000015751046102023000141720ustar 00000000000000#![doc = include_str!("../README.md")] mod chunk; mod chunk_type; mod error; mod png; pub use chunk::*; pub use chunk_type::*; pub use error::*; use gufo_common::error::ErrorWithData; pub use png::*; /// Remove chunk from PNG /// /// ``` /// let data = std::fs::read("../test-images/images/exif/exif.png").unwrap(); /// let mut png = gufo_png::Png::new(data).unwrap(); /// /// assert_eq!(png.chunks().len(), 43); /// /// // Find one Exif chunk /// let chunk = png /// .chunks() /// .into_iter() /// .find(|x| x.chunk_type() == gufo_png::ChunkType::eXIf) /// .unwrap(); /// /// // Remove that Exif chunk /// gufo_png::remove_chunk!(png, chunk); /// /// assert_eq!(png.chunks().len(), 42); /// ``` #[macro_export] macro_rules! remove_chunk { ($png:ident, $chunk:expr) => {{ let raw_chunk = $chunk.unsafe_raw_chunk(); $png.remove_chunk(raw_chunk) }}; } gufo-png-0.3.0-beta/src/png.rs000064400000000000000000000230371046102023000142050ustar 00000000000000use std::collections::BTreeMap; use std::io::{Cursor, Read}; use std::ops::Range; use std::slice::SliceIndex; use gufo_common::cicp::Cicp; use gufo_common::prelude::*; pub use super::*; pub const MAGIC_BYTES: &[u8] = &[137, 80, 78, 71, 13, 10, 26, 10]; pub const DEFAULT_INFLATE_LIMIT: usize = 10_usize.pow(6) * 100; #[derive(Debug, Clone)] pub struct Png { /// Raw data pub(crate) data: Vec, /// Chunks in the order in which they appear in the data pub(crate) chunks: Vec, pub(crate) inflate_limit: usize, } impl ImageFormat for Png { fn is_filetype(data: &[u8]) -> bool { data.starts_with(MAGIC_BYTES) } } impl ImageMetadata for Png { fn cicp(&self) -> Option { let cicp_raw = self .chunks() .into_iter() .find(|x| x.chunk_type() == ChunkType::cICP)?; Cicp::from_bytes(cicp_raw.chunk_data().get(0..4)?.try_into().ok()?).ok() } /// Returns raw exif data if available /// /// Prefers the newer [`eXIf`](ChunkType::eXIf) chunk if available and uses /// the legacy [`zTXt`](ChunkType::zTXt) chunk with [`LEGACY_EXIF_KEYWORD`] /// as fallback. fn exif(&self) -> Vec> { let chunks = self.chunks(); let mut result = Vec::new(); if let Some(exif) = chunks.iter().find(|x| x.chunk_type() == ChunkType::eXIf) { result.push(exif.chunk_data().to_vec()); } let mut legacy_exif = chunks .iter() .filter_map(|x| x.legacy_exif(self.inflate_limit)) .collect(); result.append(&mut legacy_exif); result } fn xmp(&self) -> Vec> { let chunks = self.chunks(); let mut result = Vec::new(); if let Some(xmp) = chunks.iter().find_map(|x| x.xmp().ok().flatten()) { result.push(xmp.as_bytes().to_vec()); } let mut legacy_xmp = chunks .iter() .filter_map(|x| x.legacy_xmp(self.inflate_limit)) .collect(); result.append(&mut legacy_xmp); result } } impl ImageComplete for Png {} /// Representation of a PNG image /// /// ``` /// let data = std::fs::read("../test-images/images/exif/exif.png").unwrap(); /// let png = gufo_png::Png::new(data).unwrap(); /// /// assert_eq!(png.chunks()[0].chunk_type(), gufo_png::ChunkType::IHDR); /// assert_eq!(png.chunks().len(), 43); /// /// use gufo_common::prelude::*; /// assert_eq!(png.exif().first().unwrap().len(), 7646); /// ``` impl Png { /// Returns PNG image representation /// /// * `data`: PNG image data starting with magic byte pub fn new(data: Vec) -> Result> { match Self::find_chunks(&data) { Ok(chunks) => Ok(Self { chunks, data, inflate_limit: DEFAULT_INFLATE_LIMIT, }), Err(err) => Err(ErrorWithData::new(err, data)), } } /// Convert into raw data pub fn into_inner(self) -> Vec { self.data } /// Get part of the raw data pub fn get(&mut self, index: impl SliceIndex<[u8], Output = [u8]>) -> Option<&[u8]> { self.data.get(index) } /// Returns all chunks pub fn chunks(&self) -> Vec { self.chunks.iter().map(|x| x.chunk(self)).collect() } pub fn remove_chunk(&mut self, chunk: RawChunk) -> Result<(), Error> { self.data.drain(chunk.complete_data()); self.chunks = Self::find_chunks(&self.data)?; Ok(()) } pub fn key_value(&self) -> BTreeMap { let mut map = BTreeMap::new(); for chunk in &self.chunks() { if let Ok((key, value)) = chunk.textual(1024 * 1204) { let mut buf = "\0\0".repeat(value.len()); let len = encoding_rs::mem::convert_latin1_to_str(&value, &mut buf); buf.truncate(len); map.insert(String::from_utf8_lossy(key).to_string(), buf); } } map } /// Insert chunk before first `IDAT` chunk pub fn insert_chunk(&mut self, chunk: NewChunk) -> Result<(), Error> { let first_idat = self .chunks .iter() .find(|x| x.chunk_type == ChunkType::IDAT) .ok_or(Error::NoIdatChunk)? .chunk_complete .start; self.data.splice(first_idat..first_idat, chunk.to_bytes()); self.chunks = Self::find_chunks(&self.data)?; Ok(()) } /// List all chunks in the data fn find_chunks(data: &[u8]) -> Result, Error> { let mut cur = Cursor::new(data); let magic_bytes = &mut [0; MAGIC_BYTES.len()]; cur.read_exact(magic_bytes) .map_err(|_| Error::UnexpectedEof)?; if magic_bytes != MAGIC_BYTES { return Err(Error::InvalidMagicBytes(magic_bytes.to_vec())); } let mut chunks = Vec::new(); loop { let chunk_start = cur .position() .try_into() .map_err(|_| Error::PositionTooLarge)?; // First 4 bytes are length let length_data = &mut [0; 4]; cur.read_exact(length_data) .map_err(|_| Error::UnexpectedEof)?; let length = u32::from_be_bytes(*length_data); // Next 4 bytes are chunk type let chunk_type_data = &mut [0; 4]; cur.read_exact(chunk_type_data) .map_err(|_| Error::UnexpectedEof)?; let chunk_type = ChunkType::from(u32::from_be_bytes(*chunk_type_data)); // Next are the data let data_start: usize = cur .position() .try_into() .map_err(|_| Error::PositionTooLarge)?; let data_end = data_start .checked_add(length as usize) .ok_or(Error::PositionTooLarge)?; let chunk_data = data_start..data_end; // Last 4 bytes after the data are a CRC cur.set_position(data_end as u64); let crc = &mut [0; 4]; cur.read_exact(crc).map_err(|_| Error::UnexpectedEof)?; let chunk_end = cur .position() .try_into() .map_err(|_| Error::PositionTooLarge)?; let chunk_complete = chunk_start..chunk_end; let chunk = RawChunk { chunk_type, chunk_data, chunk_complete, crc: *crc, }; chunks.push(chunk); if chunk_type == ChunkType::IEND { break; } } Ok(chunks) } /// 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 Some(last_idat) = self .chunks .iter() .rev() .find(|x| x.chunk_type == ChunkType::IDAT) else { return Err(Error::NoIdatChunk); }; let mut buf = Vec::with_capacity(other.data.len()); buf.extend_from_slice(MAGIC_BYTES); for chunk in &self.chunks { match chunk.chunk_type { ChunkType::IHDR => { let Some(new_header) = other .chunks .iter() .find(|x| x.chunk_type == ChunkType::IHDR) else { return Err(Error::NoIhdrChunk); }; buf.extend_from_slice(other.get_result(new_header.chunk_complete.clone())?); } ChunkType::iDOT => { // Drop apples proprietary iDOT chunk since it depends on // the IDAT data and IHDR and we neither know how to rewrite // nor do we care. } ChunkType::IDAT => { if chunk.chunk_data == last_idat.chunk_data { for idat_chunk in other .chunks .iter() .filter(|x| x.chunk_type == ChunkType::IDAT) { buf.extend_from_slice( other.get_result(idat_chunk.chunk_complete.clone())?, ); } } } _ => { buf.extend_from_slice(self.get_result(chunk.chunk_complete.clone())?); } } } self.chunks = Self::find_chunks(&buf)?; self.data = buf; Ok(()) } fn get_result(&self, index: Range) -> Result<&[u8], Error> { self.data .get(index.clone()) .ok_or(Error::IndexNotInData(index)) } } #[cfg(test)] mod tests { use gufo_common::cicp::*; use super::*; #[test] fn x() { let data = std::fs::read("../test-images/images/cicp-p3/cicp-p3.png").unwrap(); let png = crate::Png::new(data).unwrap(); dbg!(png.cicp()); assert_eq!( png.cicp(), Some(Cicp { color_primaries: ColorPrimaries::DciP3, transfer_characteristics: TransferCharacteristics::Gamma24, matrix_coefficients: MatrixCoefficients::Identity, video_full_range_flag: VideoRangeFlag::Full, }) ); } }