feat: new binary to par torrent files

.vscode/launch.json

@@ -0,0 +1,35 @@
+{
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Debug executable 'parse_torrent'",
+            "type": "cppdbg",
+            "request": "launch",
+            "program": "${workspaceFolder}/target/debug/parse_torrent",
+            "args": ["./tests/fixtures/torrents/MC_GRID.zip-3cd18ff2d3eec881207dcc5ca5a2c3a2a3afe462.torrent"],
+            "stopAtEntry": false,
+            "cwd": "${workspaceFolder}",
+            "environment": [],
+            "externalConsole": false,
+            "MIMode": "gdb",
+            "setupCommands": [
+                {
+                    "description": "Enable pretty-printing for gdb",
+                    "text": "-enable-pretty-printing",
+                    "ignoreFailures": true
+                }
+            ],
+            "preLaunchTask": "cargo build",
+            "miDebuggerPath": "/usr/bin/gdb",
+            "linux": {
+                "miDebuggerPath": "/usr/bin/gdb"
+            },
+            "windows": {
+                "miDebuggerPath": "C:\\MinGW\\bin\\gdb.exe"
+            },
+            "osx": {
+                "miDebuggerPath": "/usr/local/bin/gdb"
+            }
+        }
+    ]
+}

src/bin/parse_torrent.rs

@@ -0,0 +1,41 @@
+//! Command line tool to parse a torrent file and print the decoded torrent.
+//!
+//! It's only used for debugging purposes.
+use std::env;
+use std::fs::File;
+use std::io::{self, Read};
+
+use serde_bencode::de::from_bytes;
+use serde_bencode::value::Value as BValue;
+use torrust_index_backend::utils::parse_torrent;
+
+fn main() -> io::Result<()> {
+    let args: Vec<String> = env::args().collect();
+    if args.len() != 2 {
+        eprintln!("Usage:   cargo run --bin parse_torrent <PATH_TO_TORRENT_FILE>");
+        eprintln!("Example: cargo run --bin parse_torrent ./tests/fixtures/torrents/MC_GRID.zip-3cd18ff2d3eec881207dcc5ca5a2c3a2a3afe462.torrent");
+        std::process::exit(1);
+    }
+
+    println!("Reading the torrent file ...");
+
+    let mut file = File::open(&args[1])?;
+    let mut bytes = Vec::new();
+    file.read_to_end(&mut bytes)?;
+
+    println!("Decoding torrent with standard serde implementation ...");
+
+    match from_bytes::<BValue>(&bytes) {
+        Ok(_value) => match parse_torrent::decode_torrent(&bytes) {
+            Ok(torrent) => {
+                println!("Parsed torrent: \n{torrent:#?}");
+                Ok(())
+            }
+            Err(e) => Err(io::Error::new(io::ErrorKind::Other, format!("Error: invalid torrent!. {e}"))),
+        },
+        Err(e) => Err(io::Error::new(
+            io::ErrorKind::Other,
+            format!("Error: invalid bencode data!. {e}"),
+        )),
+    }
+}