feat: parse and display all optional headers (M2)

Implement parsing for all 15 optional header types found in XEX2 files:
inline values (entry point, base address, stack size, system flags),
fixed-size structures (execution info, file format, TLS, game ratings,
LAN key, checksum/timestamp), and variable-size structures (static
libraries, import libraries, resource info, original PE name, Xbox 360
logo). Add comprehensive unit and integration tests.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Cargo.lock

@@ -4,4 +4,4 @@ version = 4
 
 [[package]]
 name = "xex2tractor"
-version = "0.1.0"
+version = "0.2.0"

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "xex2tractor"
-version = "0.1.0"
+version = "0.2.0"
 edition = "2024"
 description = "A tool for extracting and inspecting Xbox 360 XEX2 executable files"
 license = "MIT"

README.md

@@ -18,6 +18,32 @@ Header Size:      0x00003000 (12288 bytes)
 Reserved:         0x00000000
 Security Offset:  0x00000090
 Header Count:     15
+
+=== Optional Headers (15 entries) ===
+
+[ENTRY_POINT] 0x824AB748
+[IMAGE_BASE_ADDRESS] 0x82000000
+[DEFAULT_STACK_SIZE] 0x00080000 (524288 bytes)
+[SYSTEM_FLAGS] 0x00000400 [PAL50_INCOMPATIBLE]
+
+[EXECUTION_INFO]
+  Media ID:        0x2D2E2EEB
+  Title ID:        0x535107D4
+  Version:         0.0.0.2
+  ...
+
+[FILE_FORMAT_INFO]
+  Encryption:  Normal (AES-128-CBC)
+  Compression: Normal (LZX)
+
+[STATIC_LIBRARIES] (12 libraries)
+  XAPILIB  2.0.3215.0 (Unknown(64))
+  D3D9     2.0.3215.1 (Unknown(64))
+  ...
+
+[IMPORT_LIBRARIES] (2 libraries)
+  xam.xex v2.0.4552.0 (min v2.0.4552.0) - 104 imports
+  xboxkrnl.exe v2.0.4552.0 (min v2.0.4552.0) - 294 imports
 ```
 
 ## Building

src/display.rs

@@ -1,5 +1,8 @@
 /// Pretty-print formatting for parsed XEX2 structures.
 use crate::header::Xex2Header;
+use crate::optional::{
+    format_hex_bytes, format_rating, format_timestamp, HeaderKey, OptionalHeaders,
+};
 
 /// Prints the XEX2 main header in a human-readable format.
 pub fn display_header(header: &Xex2Header) {
@@ -14,3 +17,186 @@ pub fn display_header(header: &Xex2Header) {
     println!("Security Offset:  0x{:08X}", header.security_offset);
     println!("Header Count:     {}", header.header_count);
 }
+
+/// Prints all parsed optional headers in a human-readable format.
+pub fn display_optional_headers(headers: &OptionalHeaders) {
+    println!();
+    println!("=== Optional Headers ({} entries) ===", headers.entries.len());
+
+    // Display inline u32 values first
+    if let Some(v) = headers.entry_point {
+        println!();
+        println!("[ENTRY_POINT] 0x{v:08X}");
+    }
+    if let Some(v) = headers.original_base_address {
+        println!("[ORIGINAL_BASE_ADDRESS] 0x{v:08X}");
+    }
+    if let Some(v) = headers.image_base_address {
+        println!("[IMAGE_BASE_ADDRESS] 0x{v:08X}");
+    }
+    if let Some(v) = headers.default_stack_size {
+        println!("[DEFAULT_STACK_SIZE] 0x{v:08X} ({v} bytes)");
+    }
+    if let Some(v) = headers.default_filesystem_cache_size {
+        println!("[DEFAULT_FILESYSTEM_CACHE_SIZE] 0x{v:08X} ({v} bytes)");
+    }
+    if let Some(v) = headers.default_heap_size {
+        println!("[DEFAULT_HEAP_SIZE] 0x{v:08X} ({v} bytes)");
+    }
+    if let Some(v) = headers.title_workspace_size {
+        println!("[TITLE_WORKSPACE_SIZE] 0x{v:08X} ({v} bytes)");
+    }
+    if let Some(v) = headers.additional_title_memory {
+        println!("[ADDITIONAL_TITLE_MEMORY] 0x{v:08X} ({v} bytes)");
+    }
+    if let Some(v) = headers.enabled_for_fastcap {
+        println!("[ENABLED_FOR_FASTCAP] 0x{v:08X}");
+    }
+
+    // System flags
+    if let Some(ref flags) = headers.system_flags {
+        println!("[SYSTEM_FLAGS] {flags}");
+    }
+
+    // Execution info
+    if let Some(ref exec) = headers.execution_info {
+        println!();
+        println!("[EXECUTION_INFO]");
+        println!("  Media ID:        0x{:08X}", exec.media_id);
+        println!("  Title ID:        0x{:08X}", exec.title_id);
+        println!("  Version:         {}", exec.version);
+        println!("  Base Version:    {}", exec.base_version);
+        println!("  Platform:        {}", exec.platform);
+        println!("  Executable Type: {}", exec.executable_type);
+        println!("  Disc:            {}/{}", exec.disc_number, exec.disc_count);
+        println!("  Savegame ID:     0x{:08X}", exec.savegame_id);
+    }
+
+    // File format info
+    if let Some(ref fmt) = headers.file_format_info {
+        println!();
+        println!("[FILE_FORMAT_INFO]");
+        println!("  Encryption:  {}", fmt.encryption_type);
+        println!("  Compression: {}", fmt.compression_type);
+    }
+
+    // Checksum + timestamp
+    if let Some(ref ct) = headers.checksum_timestamp {
+        println!();
+        println!("[CHECKSUM_TIMESTAMP]");
+        println!("  Checksum:  0x{:08X}", ct.checksum);
+        println!(
+            "  Timestamp: 0x{:08X} ({})",
+            ct.timestamp,
+            format_timestamp(ct.timestamp)
+        );
+    }
+
+    // Original PE name
+    if let Some(ref name) = headers.original_pe_name {
+        println!();
+        println!("[ORIGINAL_PE_NAME] \"{name}\"");
+    }
+
+    // Bounding path
+    if let Some(ref path) = headers.bounding_path {
+        println!("[BOUNDING_PATH] \"{path}\"");
+    }
+
+    // TLS info
+    if let Some(ref tls) = headers.tls_info {
+        println!();
+        println!("[TLS_INFO]");
+        println!("  Slot Count:       {}", tls.slot_count);
+        println!("  Raw Data Address: 0x{:08X}", tls.raw_data_address);
+        println!("  Data Size:        {} bytes", tls.data_size);
+        println!("  Raw Data Size:    {} bytes", tls.raw_data_size);
+    }
+
+    // Static libraries
+    if let Some(ref libs) = headers.static_libraries {
+        println!();
+        println!("[STATIC_LIBRARIES] ({} libraries)", libs.len());
+        for lib in libs {
+            println!("  {lib}");
+        }
+    }
+
+    // Import libraries
+    if let Some(ref imports) = headers.import_libraries {
+        println!();
+        println!("[IMPORT_LIBRARIES] ({} libraries)", imports.libraries.len());
+        for lib in &imports.libraries {
+            println!(
+                "  {} v{} (min v{}) - {} imports",
+                lib.name, lib.version, lib.version_min, lib.record_count
+            );
+        }
+    }
+
+    // Resource info
+    if let Some(ref resources) = headers.resource_info {
+        println!();
+        println!("[RESOURCE_INFO] ({} entries)", resources.len());
+        for res in resources {
+            println!(
+                "  \"{}\" @ 0x{:08X}, size: {} bytes",
+                res.name, res.address, res.size
+            );
+        }
+    }
+
+    // Game ratings
+    if let Some(ref ratings) = headers.game_ratings {
+        println!();
+        println!("[GAME_RATINGS]");
+        println!("  ESRB:    {} | PEGI:    {} | PEGI-FI: {} | PEGI-PT: {}",
+            format_rating(ratings.esrb), format_rating(ratings.pegi),
+            format_rating(ratings.pegi_fi), format_rating(ratings.pegi_pt));
+        println!("  BBFC:    {} | CERO:    {} | USK:     {} | OFLC-AU: {}",
+            format_rating(ratings.bbfc), format_rating(ratings.cero),
+            format_rating(ratings.usk), format_rating(ratings.oflc_au));
+        println!("  OFLC-NZ: {} | KMRB:    {} | Brazil:  {} | FPB:     {}",
+            format_rating(ratings.oflc_nz), format_rating(ratings.kmrb),
+            format_rating(ratings.brazil), format_rating(ratings.fpb));
+    }
+
+    // LAN key
+    if let Some(ref key) = headers.lan_key {
+        println!();
+        println!("[LAN_KEY] {}", format_hex_bytes(key));
+    }
+
+    // Callcap imports
+    if let Some(ref callcap) = headers.enabled_for_callcap {
+        println!();
+        println!("[ENABLED_FOR_CALLCAP]");
+        println!("  Start Thunk: 0x{:08X}", callcap.start_func_thunk_addr);
+        println!("  End Thunk:   0x{:08X}", callcap.end_func_thunk_addr);
+    }
+
+    // Exports by name
+    if let Some(ref dir) = headers.exports_by_name {
+        println!();
+        println!("[EXPORTS_BY_NAME]");
+        println!("  Offset: 0x{:08X}", dir.offset);
+        println!("  Size:   {} bytes", dir.size);
+    }
+
+    // Xbox 360 logo
+    if let Some(size) = headers.xbox360_logo_size {
+        println!();
+        println!("[XBOX360_LOGO] {size} bytes");
+    }
+
+    // Unknown headers
+    for entry in &headers.entries {
+        if let HeaderKey::Unknown(raw) = entry.key {
+            println!();
+            println!(
+                "[UNKNOWN(0x{raw:08X})] value/offset: 0x{:08X}",
+                entry.value
+            );
+        }
+    }
+}

src/lib.rs

@@ -9,16 +9,20 @@
 pub mod display;
 pub mod error;
 pub mod header;
+pub mod optional;
 pub mod util;
 
 use error::Result;
 use header::Xex2Header;
+use optional::OptionalHeaders;
 
 /// A parsed XEX2 file containing all extracted structures.
 #[derive(Debug)]
 pub struct Xex2File {
     /// The main XEX2 header (magic, flags, sizes, offsets).
     pub header: Xex2Header,
+    /// All parsed optional headers.
+    pub optional_headers: OptionalHeaders,
 }
 
 /// Parses an XEX2 file from a byte slice.
@@ -27,6 +31,10 @@ pub struct Xex2File {
 /// Returns a [`Xex2File`] with all successfully parsed structures.
 pub fn parse(data: &[u8]) -> Result<Xex2File> {
     let header = header::parse_header(data)?;
+    let optional_headers = optional::parse_optional_headers(data, &header)?;
 
-    Ok(Xex2File { header })
+    Ok(Xex2File {
+        header,
+        optional_headers,
+    })
 }

src/main.rs

@@ -26,4 +26,5 @@ fn main() {
     };
 
     xex2tractor::display::display_header(&xex.header);
+    xex2tractor::display::display_optional_headers(&xex.optional_headers);
 }

tests/integration.rs

@@ -1,10 +1,13 @@
 use xex2tractor::header::{ModuleFlags, XEX2_MAGIC};
+use xex2tractor::optional::{CompressionType, EncryptionType, SystemFlags};
 
 fn sample_data() -> Vec<u8> {
     let path = format!("{}/tests/data/default.xex", env!("CARGO_MANIFEST_DIR"));
     std::fs::read(&path).expect("sample file should exist at tests/data/default.xex")
 }
 
+// ── Header tests ──────────────────────────────────────────────────────────────
+
 #[test]
 fn test_full_parse() {
     let data = sample_data();
@@ -27,11 +30,98 @@ fn test_parse_empty_file() {
 #[test]
 fn test_parse_invalid_magic() {
     let mut data = sample_data();
-    // Corrupt the magic bytes
     data[0] = 0x00;
     assert!(xex2tractor::parse(&data).is_err());
 }
 
+// ── Optional header tests ─────────────────────────────────────────────────────
+
+#[test]
+fn test_optional_headers_all_present() {
+    let data = sample_data();
+    let xex = xex2tractor::parse(&data).unwrap();
+    let opt = &xex.optional_headers;
+
+    // All 15 entries should be parsed
+    assert_eq!(opt.entries.len(), 15);
+
+    // Verify presence of all expected headers
+    assert!(opt.entry_point.is_some());
+    assert!(opt.image_base_address.is_some());
+    assert!(opt.default_stack_size.is_some());
+    assert!(opt.system_flags.is_some());
+    assert!(opt.execution_info.is_some());
+    assert!(opt.file_format_info.is_some());
+    assert!(opt.checksum_timestamp.is_some());
+    assert!(opt.original_pe_name.is_some());
+    assert!(opt.tls_info.is_some());
+    assert!(opt.static_libraries.is_some());
+    assert!(opt.import_libraries.is_some());
+    assert!(opt.resource_info.is_some());
+    assert!(opt.game_ratings.is_some());
+    assert!(opt.lan_key.is_some());
+    assert!(opt.xbox360_logo_size.is_some());
+}
+
+#[test]
+fn test_optional_inline_values() {
+    let data = sample_data();
+    let xex = xex2tractor::parse(&data).unwrap();
+    let opt = &xex.optional_headers;
+
+    assert_eq!(opt.entry_point.unwrap(), 0x824AB748);
+    assert_eq!(opt.image_base_address.unwrap(), 0x82000000);
+    assert_eq!(opt.default_stack_size.unwrap(), 0x00080000);
+    assert_eq!(opt.system_flags.unwrap(), SystemFlags(0x00000400));
+}
+
+#[test]
+fn test_optional_execution_info() {
+    let data = sample_data();
+    let xex = xex2tractor::parse(&data).unwrap();
+    let exec = xex.optional_headers.execution_info.as_ref().unwrap();
+
+    assert_eq!(exec.title_id, 0x535107D4);
+    assert_eq!(exec.media_id, 0x2D2E2EEB);
+}
+
+#[test]
+fn test_optional_file_format() {
+    let data = sample_data();
+    let xex = xex2tractor::parse(&data).unwrap();
+    let fmt = xex.optional_headers.file_format_info.as_ref().unwrap();
+
+    assert_eq!(fmt.encryption_type, EncryptionType::Normal);
+    assert_eq!(fmt.compression_type, CompressionType::Normal);
+}
+
+#[test]
+fn test_optional_static_libraries() {
+    let data = sample_data();
+    let xex = xex2tractor::parse(&data).unwrap();
+    let libs = xex.optional_headers.static_libraries.as_ref().unwrap();
+
+    assert_eq!(libs.len(), 12);
+    // Verify first and a few known libraries
+    assert_eq!(libs[0].name, "XAPILIB");
+    assert_eq!(libs[1].name, "D3D9");
+    assert_eq!(libs[3].name, "XBOXKRNL");
+}
+
+#[test]
+fn test_optional_import_libraries() {
+    let data = sample_data();
+    let xex = xex2tractor::parse(&data).unwrap();
+    let imports = xex.optional_headers.import_libraries.as_ref().unwrap();
+
+    assert_eq!(imports.string_table.len(), 2);
+    assert_eq!(imports.string_table[0], "xam.xex");
+    assert_eq!(imports.string_table[1], "xboxkrnl.exe");
+    assert!(!imports.libraries.is_empty());
+}
+
+// ── CLI tests ─────────────────────────────────────────────────────────────────
+
 #[test]
 fn test_cli_runs_with_sample() {
     let path = format!("{}/tests/data/default.xex", env!("CARGO_MANIFEST_DIR"));
@@ -42,10 +132,28 @@ fn test_cli_runs_with_sample() {
 
     assert!(output.status.success(), "CLI should exit successfully");
     let stdout = String::from_utf8_lossy(&output.stdout);
-    assert!(stdout.contains("XEX2 Header"), "should display header section");
-    assert!(stdout.contains("0x58455832"), "should display magic value");
-    assert!(stdout.contains("TITLE"), "should display module flag name");
-    assert!(stdout.contains("Header Count:     15"), "should show 15 headers");
+
+    // Header section
+    assert!(stdout.contains("XEX2 Header"));
+    assert!(stdout.contains("0x58455832"));
+    assert!(stdout.contains("TITLE"));
+    assert!(stdout.contains("Header Count:     15"));
+
+    // Optional headers section
+    assert!(stdout.contains("Optional Headers (15 entries)"));
+    assert!(stdout.contains("[ENTRY_POINT] 0x824AB748"));
+    assert!(stdout.contains("[IMAGE_BASE_ADDRESS] 0x82000000"));
+    assert!(stdout.contains("EXECUTION_INFO"));
+    assert!(stdout.contains("0x535107D4")); // title ID
+    assert!(stdout.contains("FILE_FORMAT_INFO"));
+    assert!(stdout.contains("Normal (AES-128-CBC)"));
+    assert!(stdout.contains("Normal (LZX)"));
+    assert!(stdout.contains("STATIC_LIBRARIES"));
+    assert!(stdout.contains("XAPILIB"));
+    assert!(stdout.contains("IMPORT_LIBRARIES"));
+    assert!(stdout.contains("xboxkrnl.exe"));
+    assert!(stdout.contains("default.pe")); // original PE name
+    assert!(stdout.contains("PAL50_INCOMPATIBLE")); // system flags
 }
 
 #[test]
@@ -54,9 +162,9 @@ fn test_cli_no_args() {
         .output()
         .expect("failed to run xex2tractor");
 
-    assert!(!output.status.success(), "CLI should fail without args");
+    assert!(!output.status.success());
     let stderr = String::from_utf8_lossy(&output.stderr);
-    assert!(stderr.contains("Usage"), "should print usage message");
+    assert!(stderr.contains("Usage"));
 }
 
 #[test]
@@ -66,5 +174,5 @@ fn test_cli_missing_file() {
         .output()
         .expect("failed to run xex2tractor");
 
-    assert!(!output.status.success(), "CLI should fail with missing file");
+    assert!(!output.status.success());
 }