feat: move core services to services directory

src/services/compression_service.rs

@@ -0,0 +1,33 @@
+use crate::compression_engine::{get_compression_engine, CompressionType};
+use crate::services::error::CoreError;
+use std::io::Read;
+use std::path::PathBuf;
+use std::str::FromStr;
+use anyhow::anyhow;
+
+pub struct CompressionService;
+
+impl CompressionService {
+    pub fn new() -> Self {
+        Self
+    }
+
+    pub fn get_item_content(&self, item_path: PathBuf, compression: &str) -> Result<Vec<u8>, CoreError> {
+        let compression_type = CompressionType::from_str(compression)
+            .map_err(|e| CoreError::Compression(e.to_string()))?;
+        let engine = get_compression_engine(compression_type)
+            .map_err(|e| CoreError::Other(anyhow!(e.to_string())))?;
+
+        let mut reader = engine.open(item_path.clone())
+            .map_err(|e| CoreError::Other(anyhow!("Failed to open item file {:?}: {}", item_path, e)))?;
+        let mut content = Vec::new();
+        reader.read_to_end(&mut content)?;
+        Ok(content)
+    }
+}
+
+impl Default for CompressionService {
+    fn default() -> Self {
+        Self::new()
+    }
+}