From dcee123194c2d91964645d6f9f618af7c736a037 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=B6rn-Michael=20Miehe?=
 <40151420+ldericher@users.noreply.github.com>
Date: Mon, 26 May 2025 20:31:22 +0000
Subject: [PATCH] rough impl for FileChunks

---
 src/main.rs        | 11 +++---
 src/sharry/file.rs | 91 ++++++++++++++++++++++++++++++++++------------
 2 files changed, 72 insertions(+), 30 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index 7c931fb..3bf93cc 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -22,13 +22,12 @@ fn main() {
     let share = Share::create(&agent, &alias, share).unwrap();
     info!("share: {:?}", share);
 
-    let file = File::create(
-        &agent,
-        &share,
-        "/lib/x86_64-linux-gnu/liblldb-14.so.1".into(),
-    )
-    .unwrap();
+    let file = File::create(&agent, &share, "/lib/x86_64-linux-gnu/liblldb-14.so.1").unwrap();
     info!("file: {:?}", file);
 
+    for chunk in file.chunks(10_485_760) {
+        println!("chunk len: {}", chunk.len());
+    }
+
     share.notify(&agent).unwrap();
 }
diff --git a/src/sharry/file.rs b/src/sharry/file.rs
index 1fdda4b..baceaef 100644
--- a/src/sharry/file.rs
+++ b/src/sharry/file.rs
@@ -1,11 +1,13 @@
 use std::{
     ffi::OsStr,
     fs,
-    io::{self, Read},
+    io::{self, Read, Seek},
+    os::unix::fs::FileExt,
     path::{Path, PathBuf},
+    str::FromStr,
 };
 
-use log::debug;
+use log::{debug, error};
 use ureq::http::StatusCode;
 
 use super::{
@@ -24,17 +26,18 @@ impl<'t> File<'t> {
     pub fn create(
         http: &ureq::Agent,
         share: &'t Share,
-        file_path: PathBuf,
+        file_path: impl Into<PathBuf>,
     ) -> Result<Self, ureq::Error> {
-        let endpoint = share
-            .alias
-            .get_endpoint(format!("alias/upload/{}/files/tus", share.id));
-
+        let file_path: PathBuf = file_path.into();
         let filename = file_path
             .file_name()
             .and_then(OsStr::to_str)
             .unwrap_or("file.bin");
 
+        let endpoint = share
+            .alias
+            .get_endpoint(format!("alias/upload/{}/files/tus", share.id));
+
         let res = http
             .post(endpoint)
             .sharry_header(share.alias)
@@ -55,14 +58,6 @@ impl<'t> File<'t> {
 
         debug!("location: {}", location);
 
-        // let start = 10;
-        // let count = 10;
-
-        // let mut f = File::open(path)?;
-        // f.seek(SeekFrom::Start(0));
-        // let mut buf = vec![0; count];
-        // f.read_exact(&mut buf)?;
-
         Ok(Self {
             alias: share.alias,
             file_path,
@@ -70,23 +65,71 @@ impl<'t> File<'t> {
         })
     }
 
-    pub fn upload(&self, chunk_size: usize) -> UploadChunk {
-        UploadChunk::new(&self.file_path, chunk_size).unwrap()
+    pub fn chunks(&self, chunk_size: usize) -> FileChunks {
+        FileChunks::new(&self.file_path, chunk_size)
     }
+
+    // pub fn upload(&mut self) -> io::Result<()> {
+    //     let mut f = fs::File::open(&self.path)?;
+    //     f.seek(io::SeekFrom::Start(0));
+
+    //     let patch_size = f.read(&mut self.buffer)?;
+    //     let patch_data = &self.buffer[0..patch_size];
+
+    //     Ok(())
+    // }
 }
 
-pub struct UploadChunk {
+pub struct FileChunks<'t> {
     num: u64,
-    f: fs::File,
+    path: &'t PathBuf,
     buffer: Vec<u8>,
+    data_len: Option<usize>,
 }
 
-impl UploadChunk {
-    fn new(path: impl AsRef<Path>, chunk_size: usize) -> io::Result<Self> {
-        Ok(Self {
+impl<'t> FileChunks<'t> {
+    fn new(path: &'t PathBuf, chunk_size: usize) -> Self {
+        Self {
             num: 0,
-            f: fs::File::open(path)?,
+            path,
             buffer: vec![0; chunk_size],
-        })
+            data_len: None,
+        }
+    }
+
+    fn get_offset(&self) -> Option<u64> {
+        let buffer_len: u64 = self
+            .buffer
+            .len()
+            .try_into()
+            .inspect_err(|e| error!("Error converting length: {}", e))
+            .ok()?;
+
+        Some(self.num * buffer_len)
+    }
+}
+
+impl<'t> Iterator for FileChunks<'t> {
+    type Item = &'t [u8];
+
+    fn next(&mut self) -> Option<Self::Item> {
+        let mut f = fs::File::open(&self.path)
+            .inspect_err(|e| error!("Error opening file: {}", e))
+            .ok()?;
+
+        f.seek(io::SeekFrom::Start(self.get_offset()?)).ok()?;
+
+        self.data_len = {
+            let read_len = f
+                .read(&mut self.buffer)
+                .inspect_err(|e| error!("Error reading file: {}", e))
+                .ok()?;
+
+            Some(read_len).filter(|l| *l > 0)
+        };
+
+        self.num += 1;
+
+        Some(unsafe { std::mem::transmute(&self.buffer[0..self.data_len?]) })
     }
 }