skinned off unused deps

Cargo.toml

@@ -6,6 +6,6 @@ edition = "2021"
 [dependencies]
 clap = { version = "4.5.22", features = ["derive"] }
 glob = "0.3.1"
-image = "0.25.5"
-oxipng = "9.1.3"
-zune-png = "0.4.10"
+adler = "1.0.2"
+crc32fast = "1.4.2"
+miniz_oxide = "0.8.0"

src/catzou/mod.rs

@@ -0,0 +1,134 @@
+use std::{
+    fmt::Debug,
+    fs::File,
+    io::{BufReader, BufWriter, Read, Write},
+    usize,
+};
+use std::path::PathBuf;
+use adler::Adler32;
+use crc32fast::Hasher;
+use miniz_oxide::inflate::core::{
+    decompress,
+    inflate_flags::{
+        TINFL_FLAG_IGNORE_ADLER32, TINFL_FLAG_PARSE_ZLIB_HEADER,
+        TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF,
+    },
+    DecompressorOxide,
+};
+
+struct Chunk {
+    kind: [u8; 4],
+    data: Vec<u8>,
+    crc: [u8; 4],
+}
+
+impl Debug for Chunk {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("Chunk")
+            .field("kind", &self.kind)
+            .field("data len", &self.data.len())
+            .field("crc", &self.crc)
+            .finish()
+    }
+}
+
+impl Chunk {
+    fn kind_to_string(&self) -> String {
+        String::from_utf8_lossy(&self.kind).to_string()
+    }
+}
+
+pub fn encoder(inpath: PathBuf, outpath: PathBuf) {
+    let file = File::open(inpath).unwrap();
+    let mut bufread = BufReader::new(file);
+
+    // read the png header
+    let mut header = [0; 8];
+    bufread.read_exact(&mut header).unwrap();
+
+    let mut chunks = Vec::new();
+
+    let mut lenbuf = [0; 4];
+    while let Ok(_) = bufread.read_exact(&mut lenbuf) {
+        let len = u32::from_be_bytes(lenbuf);
+
+        let mut kind = [0; 4];
+        bufread.read_exact(&mut kind).unwrap();
+
+        let data = {
+            let mut data = vec![0; len as usize];
+            bufread.read_exact(&mut data).unwrap();
+            data
+        };
+
+        let mut crc = [0; 4];
+        bufread.read_exact(&mut crc).unwrap();
+
+        let mut chunk = Chunk { kind, data, crc };
+        println!("{:?}", chunk);
+
+        // recode the compressed image data
+        if chunk.kind == *b"IDAT" {
+            println!("Decompressing IDAT chunk");
+            let mut decompressor = DecompressorOxide::new();
+            decompressor.init();
+            let mut buf = vec![0; 1024 * 1024 * 1024]; // this could probably be smaller
+            let data = decompress(
+                &mut decompressor,
+                &chunk.data,
+                &mut buf,
+                0,
+                TINFL_FLAG_IGNORE_ADLER32
+                    | TINFL_FLAG_PARSE_ZLIB_HEADER
+                    | TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF,
+            );
+
+            println!(
+                "Decompressed IDAT chunk status {:?}, bytes read {}, bytes outputted {}",
+                data.0, data.1, data.2
+            );
+
+            let _ = buf.split_off(data.2);
+
+            let mut adler = Adler32::new();
+            adler.write_slice(&buf);
+
+            let csum = adler.checksum().to_be_bytes();
+
+            // replace the last 4 bytes of the data with the new checksum
+            let data_len = chunk.data.len();
+            chunk.data[data_len - 4..].copy_from_slice(&csum);
+            println!("Corrected Adler32 checksum");
+        }
+
+        let mut hasher = Hasher::new();
+        hasher.update(&chunk.kind);
+        hasher.update(&chunk.data);
+        let checksum = hasher.finalize();
+
+        if checksum != u32::from_be_bytes(chunk.crc) {
+            println!("CRC error in chunk {:?}", chunk.kind_to_string());
+            chunk.crc = checksum.to_be_bytes();
+            println!("Corrected CRC");
+        }
+
+        chunks.push(chunk);
+    }
+
+    let ofile = File::create(outpath).unwrap();
+    let mut writer = BufWriter::new(ofile);
+
+    // write a new header
+    writer
+        .write_all(&[0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A])
+        .unwrap();
+
+    for chunk in chunks {
+        writer
+            .write_all(&u32::to_be_bytes(chunk.data.len() as u32))
+            .unwrap();
+        writer.write_all(&chunk.kind).unwrap();
+        writer.write_all(&chunk.data).unwrap();
+        writer.write_all(&chunk.crc).unwrap();
+    }
+}

src/main.rs

@@ -1,12 +1,11 @@
+mod catzou;
 use clap::Parser;
 use glob::glob;
-use image::ImageBuffer;
-use std::io::{BufReader, Read};
+use std::io::{Read};
 use std::{
-    fs::{metadata, File},
-    path::{Path, PathBuf},
+    fs::{metadata},
+    path::{PathBuf},
 };
-use zune_png::{zune_core::options::DecoderOptions, PngDecoder};
 
 #[derive(Parser, Debug)]
 #[command(version, about, long_about = None)]
@@ -14,6 +13,7 @@ struct Args {
     /// Input path
     ///
     /// Include a file path or a directory path. Do not use any asterisks or wildcards.
+    /// Do not use multiple paths in one command.
     /// If the path includes spaces you may find it useful to use speechmarks (" ") around the path.
     #[arg(short, long)]
     path: PathBuf,
@@ -21,9 +21,9 @@ struct Args {
     //    /// Output path
     //    #[arg(short, long,default_value="")]
     //    out: PathBuf,
-    /// Debug mode
+    /// Optional Debug mode
     ///
-    /// Either "true" or "false"
+    /// Either "true" or "false" in lowercase.
     #[arg(short, long, default_value_t = false)]
     debug: bool,
 }
@@ -31,7 +31,7 @@ struct Args {
 fn main() {
     // argument parsing yep
     let Args: Args = Args::parse();
-    let pathfr = Args.path.clone();
+    let mut pathfr = Args.path.clone();
     let debugmode = Args.debug;
 
     let mut filelist: Vec<PathBuf> = Vec::new();
@@ -39,9 +39,12 @@ fn main() {
     let pathtype = metadata(&pathfr).unwrap();
     if pathtype.is_file() {
         filelist.push(PathBuf::from(format!("{:?}", pathtype)));
-        println!("input path FILE");
+        println!("input path type is FILE");
     } else if pathtype.is_dir() {
-        println!("input path DIR");
+        println!("input path type is DIR");
+        if pathfr.ends_with("/") {
+            pathfr.pop();
+        }
         // parse file list if it's a dir
         for entry in glob(&format!("{}/**/*.png", pathfr.clone().display()))
             .expect("Failed to read glob pattern (you should panic)")
@@ -49,15 +52,17 @@ fn main() {
             match entry {
                 Ok(path) => {
                     // println!("{:?}", path.display());
-                    filelist.push(path.display().to_string().parse().unwrap());
+                    filelist.push(
+                        path.display().to_string().parse().unwrap()
+                    );
                 }
                 Err(e) => {
-                    println!("Shell globbing error");
+                    eprintln!("Globbing error... uh oh...");
                 }
             }
         }
     } else {
-        panic!("that input is neither file nor dir and thats scary...")
+        eprint!("that input is neither file nor dir and thats scary... aaa")
     }
 
     //    if debugmode {
@@ -67,38 +72,6 @@ fn main() {
     //    }
 
     for thatpath in filelist {
-        encoder(thatpath, debugmode)
+        catzou::encoder(thatpath.to_owned(), thatpath)
     }
 }
-
-fn encoder(filepath: PathBuf, modeDebug: bool) {
-    let file = File::open(&filepath).unwrap();
-    let mut data = BufReader::new(file);
-    let mut buf = Vec::new();
-    data.read_to_end(&mut buf).unwrap();
-
-    let mut decoder = PngDecoder::new_with_options(buf, DecoderOptions::new_cmd());
-    decoder.decode_headers().unwrap();
-    let dim = decoder.get_dimensions().unwrap();
-    //dbg!(dim);
-    let col = decoder.get_colorspace().unwrap();
-    //dbg!(col);
-    let data = decoder.decode_raw().unwrap();
-    //dbg!(&data);
-    let depth = decoder.get_depth().unwrap();
-
-    if modeDebug {
-        println!("Filepath: {:?}", filepath);
-        println!("Dimensions: {:?}", dim);
-        println!("Colorspace: {:?}", col);
-        println!("BitDepth: {:?}", depth);
-    }
-
-    // TODO: figure out propper color checks rn we assume data is RGBA
-
-    let out: ImageBuffer<image::Rgba<u8>, Vec<u8>> =
-        ImageBuffer::from_raw(dim.0 as u32, dim.1 as u32, data).unwrap();
-
-    out.save(filepath.clone()).unwrap();
-    println!("wrote file {:?}\n",filepath)
-}