feat: add export database and import record decoding (M7)

- New src/exports.rs: embeds doc/xbox360_exports.md via include_str!
  and lazily parses it into a lookup table (OnceLock). Covers 2,913
  exports across xboxkrnl.exe, xam.xex, and xbdm.xex.
- New src/imports.rs: decodes import records from extracted PE images
  by reading the u32 at each import address, extracting record type
  (variable/thunk) and ordinal, and resolving against the export DB.
- inspect command now shows a full resolved imports table with names.

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

Cargo.lock

@@ -288,7 +288,7 @@ dependencies = [
 
 [[package]]
 name = "xex2tractor"
-version = "0.6.1"
+version = "0.7.0"
 dependencies = [
  "aes",
  "cbc",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "xex2tractor"
-version = "0.6.1"
+version = "0.7.0"
 edition = "2024"
 description = "A tool for extracting and inspecting Xbox 360 XEX2 executable files"
 license = "MIT"

src/display.rs

@@ -1,6 +1,7 @@
 /// Pretty-print formatting for parsed XEX2 structures.
 use crate::crypto;
 use crate::header::Xex2Header;
+use crate::imports::ResolvedImport;
 use crate::optional::{
     format_hex_bytes, format_rating, format_timestamp, CompressionInfo, HeaderKey, OptionalHeaders,
 };
@@ -314,3 +315,44 @@ pub fn display_security_info(security: &SecurityInfo) {
         "  Total mapped size: 0x{address_offset:X} ({address_offset} bytes)"
     );
 }
+
+/// Prints resolved import records grouped by library.
+pub fn display_resolved_imports(imports: &[ResolvedImport]) {
+    // Count per library
+    let mut lib_counts: Vec<(String, usize)> = Vec::new();
+    for imp in imports {
+        if let Some(entry) = lib_counts.iter_mut().find(|(name, _)| *name == imp.library) {
+            entry.1 += 1;
+        } else {
+            lib_counts.push((imp.library.clone(), 1));
+        }
+    }
+
+    let summary: Vec<String> = lib_counts
+        .iter()
+        .map(|(name, count)| format!("{name}: {count}"))
+        .collect();
+    println!();
+    println!(
+        "=== Resolved Imports ({}) ===",
+        summary.join(", ")
+    );
+
+    let mut current_lib = "";
+    for imp in imports {
+        if imp.library != current_lib {
+            println!();
+            println!("  [{}]", imp.library);
+            current_lib = &imp.library;
+        }
+
+        let name = imp
+            .export
+            .as_ref()
+            .map_or("<unknown>", |e| &e.name);
+        println!(
+            "    0x{:08X}  {:>8}  ordinal 0x{:04X}  {}",
+            imp.record.address, imp.record.record_type, imp.record.ordinal, name
+        );
+    }
+}

src/exports.rs

@@ -0,0 +1,194 @@
+/// Xbox 360 system export database.
+///
+/// Parses the embedded `doc/xbox360_exports.md` at first access and provides
+/// ordinal-to-name lookups for xboxkrnl.exe, xam.xex, and xbdm.xex.
+use std::collections::HashMap;
+use std::sync::OnceLock;
+
+static EXPORT_DB: OnceLock<ExportDatabase> = OnceLock::new();
+
+const EXPORTS_MD: &str = include_str!("../doc/xbox360_exports.md");
+
+/// Information about a single Xbox 360 system export.
+#[derive(Debug, Clone)]
+pub struct ExportInfo {
+    pub ordinal: u16,
+    pub name: String,
+    pub is_function: bool,
+}
+
+/// Lookup table mapping `(library_filename, ordinal)` to export info.
+struct ExportDatabase {
+    /// Key: lowercase library filename (e.g. "xboxkrnl.exe"), value: ordinal -> ExportInfo
+    modules: HashMap<String, HashMap<u16, ExportInfo>>,
+}
+
+/// Returns the total number of exports in the database.
+pub fn total_count() -> usize {
+    let db = get_db();
+    db.modules.values().map(|m| m.len()).sum()
+}
+
+/// Returns the number of exports for a given library.
+pub fn module_count(library: &str) -> usize {
+    let db = get_db();
+    db.modules
+        .get(&library.to_ascii_lowercase())
+        .map_or(0, |m| m.len())
+}
+
+/// Looks up an export by library filename and ordinal.
+pub fn lookup(library: &str, ordinal: u16) -> Option<&'static ExportInfo> {
+    let db = get_db();
+    db.modules
+        .get(&library.to_ascii_lowercase())?
+        .get(&ordinal)
+}
+
+fn get_db() -> &'static ExportDatabase {
+    EXPORT_DB.get_or_init(|| parse_exports_md(EXPORTS_MD))
+}
+
+/// Parses the markdown export database into a lookup structure.
+///
+/// Expected format per module section:
+/// ```text
+/// ## module_name (filename.exe)
+/// ...
+/// | 0xNNN | FunctionName | function | status | ... |
+/// ```
+fn parse_exports_md(md: &str) -> ExportDatabase {
+    let mut modules: HashMap<String, HashMap<u16, ExportInfo>> = HashMap::new();
+    let mut current_file: Option<String> = None;
+
+    for line in md.lines() {
+        // Detect section headers: "## xboxkrnl (xboxkrnl.exe)"
+        if let Some(rest) = line.strip_prefix("## ") {
+            if let (Some(paren_start), Some(paren_end)) =
+                (rest.find('('), rest.find(')'))
+            {
+                let filename = rest[paren_start + 1..paren_end].trim().to_ascii_lowercase();
+                current_file = Some(filename);
+            } else {
+                current_file = None;
+            }
+            continue;
+        }
+
+        // Parse table rows: "| 0xNNN | Name | function/variable | ... |"
+        let Some(ref file) = current_file else {
+            continue;
+        };
+        if !line.starts_with("| 0x") {
+            continue;
+        }
+
+        let cols: Vec<&str> = line.split('|').collect();
+        // cols[0] is empty (before first |), cols[1] = ordinal, cols[2] = name, cols[3] = type
+        if cols.len() < 4 {
+            continue;
+        }
+
+        let ordinal_str = cols[1].trim();
+        let name = cols[2].trim();
+        let type_str = cols[3].trim();
+
+        let Some(ordinal) = parse_hex_ordinal(ordinal_str) else {
+            continue;
+        };
+
+        let entry = ExportInfo {
+            ordinal,
+            name: name.to_string(),
+            is_function: type_str == "function",
+        };
+
+        modules
+            .entry(file.clone())
+            .or_default()
+            .insert(ordinal, entry);
+    }
+
+    ExportDatabase { modules }
+}
+
+fn parse_hex_ordinal(s: &str) -> Option<u16> {
+    let hex = s.strip_prefix("0x").or_else(|| s.strip_prefix("0X"))?;
+    u16::from_str_radix(hex, 16).ok()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_total_count() {
+        assert_eq!(total_count(), 2913);
+    }
+
+    #[test]
+    fn test_module_counts() {
+        assert_eq!(module_count("xboxkrnl.exe"), 922);
+        assert_eq!(module_count("xam.xex"), 1736);
+        assert_eq!(module_count("xbdm.xex"), 255);
+    }
+
+    #[test]
+    fn test_module_count_case_insensitive() {
+        assert_eq!(module_count("XBOXKRNL.EXE"), 922);
+        assert_eq!(module_count("Xam.Xex"), 1736);
+    }
+
+    #[test]
+    fn test_module_count_unknown() {
+        assert_eq!(module_count("unknown.dll"), 0);
+    }
+
+    #[test]
+    fn test_lookup_xboxkrnl_known() {
+        let info = lookup("xboxkrnl.exe", 0x009).unwrap();
+        assert_eq!(info.name, "ExAllocatePool");
+        assert!(info.is_function);
+        assert_eq!(info.ordinal, 0x009);
+    }
+
+    #[test]
+    fn test_lookup_xboxkrnl_variable() {
+        let info = lookup("xboxkrnl.exe", 0x00C).unwrap();
+        assert_eq!(info.name, "ExConsoleGameRegion");
+        assert!(!info.is_function);
+    }
+
+    #[test]
+    fn test_lookup_xam_known() {
+        let info = lookup("xam.xex", 0x001).unwrap();
+        assert_eq!(info.name, "NetDll_WSAStartup");
+        assert!(info.is_function);
+    }
+
+    #[test]
+    fn test_lookup_xbdm_known() {
+        let info = lookup("xbdm.xex", 0x001).unwrap();
+        assert_eq!(info.name, "DmAllocatePool");
+        assert!(info.is_function);
+    }
+
+    #[test]
+    fn test_lookup_unknown_ordinal() {
+        assert!(lookup("xboxkrnl.exe", 0xFFFF).is_none());
+    }
+
+    #[test]
+    fn test_lookup_unknown_library() {
+        assert!(lookup("nonexistent.dll", 0x001).is_none());
+    }
+
+    #[test]
+    fn test_parse_hex_ordinal() {
+        assert_eq!(parse_hex_ordinal("0x001"), Some(1));
+        assert_eq!(parse_hex_ordinal("0x3A3"), Some(0x3A3));
+        assert_eq!(parse_hex_ordinal("0xFFFF"), Some(0xFFFF));
+        assert_eq!(parse_hex_ordinal("invalid"), None);
+        assert_eq!(parse_hex_ordinal(""), None);
+    }
+}

src/imports.rs

@@ -0,0 +1,121 @@
+/// Import record decoding and resolution for XEX2 PE images.
+///
+/// Reads import records from the extracted PE image, decodes their type and
+/// ordinal, and resolves them against the Xbox 360 export database.
+use std::fmt;
+
+use crate::error::{Result, Xex2Error};
+use crate::exports::{self, ExportInfo};
+use crate::util::read_u32_be;
+use crate::Xex2File;
+
+/// The type of an import record.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum ImportRecordType {
+    /// A 4-byte variable slot (record_type 0x00).
+    Variable,
+    /// A 16-byte function thunk stub (record_type 0x01).
+    Thunk,
+}
+
+impl fmt::Display for ImportRecordType {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            ImportRecordType::Variable => write!(f, "variable"),
+            ImportRecordType::Thunk => write!(f, "thunk"),
+        }
+    }
+}
+
+/// A decoded import record from the PE image.
+#[derive(Debug, Clone)]
+pub struct ImportRecord {
+    /// The original memory address from the XEX2 import table.
+    pub address: u32,
+    /// Offset within the PE image (address - load_address).
+    pub pe_offset: usize,
+    /// Whether this is a variable slot or function thunk.
+    pub record_type: ImportRecordType,
+    /// The ordinal number identifying the imported function/variable.
+    pub ordinal: u16,
+}
+
+/// An import record resolved against the export database.
+#[derive(Debug, Clone)]
+pub struct ResolvedImport {
+    /// The decoded import record.
+    pub record: ImportRecord,
+    /// The library filename (e.g. "xboxkrnl.exe").
+    pub library: String,
+    /// The export info if the ordinal was found in the database.
+    pub export: Option<ExportInfo>,
+}
+
+/// Decodes all import records from the PE image and resolves them against
+/// the export database.
+///
+/// Iterates over each import library's addresses, reads the u32 value at
+/// the corresponding PE offset, extracts record_type and ordinal, then
+/// looks up the ordinal in the export database.
+pub fn decode_import_records(pe_image: &[u8], xex: &Xex2File) -> Result<Vec<ResolvedImport>> {
+    let imports = xex
+        .optional_headers
+        .import_libraries
+        .as_ref()
+        .ok_or_else(|| Xex2Error::InvalidPeImage("no import libraries header".into()))?;
+
+    let load_address = xex.security_info.load_address;
+    let mut resolved = Vec::new();
+
+    for lib in &imports.libraries {
+        for &addr in &lib.import_addresses {
+            let pe_offset = (addr.wrapping_sub(load_address)) as usize;
+
+            let raw = read_u32_be(pe_image, pe_offset).map_err(|_| {
+                Xex2Error::InvalidPeImage(format!(
+                    "import address 0x{addr:08X} (offset 0x{pe_offset:08X}) out of bounds"
+                ))
+            })?;
+
+            let record_type_byte = (raw >> 24) & 0xFF;
+            let ordinal = (raw & 0xFFFF) as u16;
+
+            let record_type = match record_type_byte {
+                0x00 => ImportRecordType::Variable,
+                0x01 => ImportRecordType::Thunk,
+                _ => {
+                    // Unknown record types — treat as variable (best effort)
+                    ImportRecordType::Variable
+                }
+            };
+
+            let record = ImportRecord {
+                address: addr,
+                pe_offset,
+                record_type,
+                ordinal,
+            };
+
+            let export = exports::lookup(&lib.name, ordinal).cloned();
+
+            resolved.push(ResolvedImport {
+                record,
+                library: lib.name.clone(),
+                export,
+            });
+        }
+    }
+
+    Ok(resolved)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_import_record_type_display() {
+        assert_eq!(ImportRecordType::Variable.to_string(), "variable");
+        assert_eq!(ImportRecordType::Thunk.to_string(), "thunk");
+    }
+}

src/lib.rs

@@ -10,8 +10,10 @@ pub mod crypto;
 pub mod decompress;
 pub mod display;
 pub mod error;
+pub mod exports;
 pub mod extract;
 pub mod header;
+pub mod imports;
 pub mod optional;
 pub mod security;
 pub mod util;

src/main.rs

@@ -42,6 +42,23 @@ fn cmd_inspect(path: &PathBuf) {
     xex2tractor::display::display_header(&xex.header);
     xex2tractor::display::display_optional_headers(&xex.optional_headers);
     xex2tractor::display::display_security_info(&xex.security_info);
+
+    // Decode and display resolved imports (requires extracting the PE image)
+    if xex.optional_headers.import_libraries.is_some() {
+        match xex2tractor::extract::extract_pe_image(&data, &xex) {
+            Ok(pe_image) => match xex2tractor::imports::decode_import_records(&pe_image, &xex) {
+                Ok(resolved) => {
+                    xex2tractor::display::display_resolved_imports(&resolved);
+                }
+                Err(e) => {
+                    eprintln!("Warning: could not decode imports: {e}");
+                }
+            },
+            Err(e) => {
+                eprintln!("Warning: could not extract PE for import resolution: {e}");
+            }
+        }
+    }
 }
 
 fn cmd_extract(path: &PathBuf, output: Option<PathBuf>) {

tests/integration.rs

@@ -1,6 +1,8 @@
 use xex2tractor::crypto;
+use xex2tractor::exports;
 use xex2tractor::extract;
 use xex2tractor::header::{ModuleFlags, XEX2_MAGIC};
+use xex2tractor::imports::{self, ImportRecordType};
 use xex2tractor::optional::{CompressionInfo, CompressionType, EncryptionType, SystemFlags};
 use xex2tractor::security::{ImageFlags, MediaFlags, RegionFlags};
 
@@ -440,3 +442,137 @@ fn test_cli_extract_shows_format_info() {
 
     let _ = std::fs::remove_file(&output_path);
 }
+
+// ── Export database tests ────────────────────────────────────────────────────
+
+#[test]
+fn test_export_db_total_count() {
+    assert_eq!(exports::total_count(), 2913);
+}
+
+#[test]
+fn test_export_db_module_counts() {
+    assert_eq!(exports::module_count("xboxkrnl.exe"), 922);
+    assert_eq!(exports::module_count("xam.xex"), 1736);
+    assert_eq!(exports::module_count("xbdm.xex"), 255);
+}
+
+#[test]
+fn test_export_db_lookup_known() {
+    let info = exports::lookup("xboxkrnl.exe", 0x009).unwrap();
+    assert_eq!(info.name, "ExAllocatePool");
+    assert!(info.is_function);
+}
+
+#[test]
+fn test_export_db_lookup_unknown_ordinal() {
+    assert!(exports::lookup("xboxkrnl.exe", 0xFFFF).is_none());
+}
+
+// ── Import record decoding tests ─────────────────────────────────────────────
+
+#[test]
+fn test_decode_import_records() {
+    let data = sample_data();
+    let xex = xex2tractor::parse(&data).unwrap();
+    let pe_image = extract::extract_pe_image(&data, &xex).unwrap();
+
+    let resolved = imports::decode_import_records(&pe_image, &xex).unwrap();
+
+    // Sample has 104 xam.xex + 294 xboxkrnl.exe = 398 total import records
+    assert_eq!(resolved.len(), 398);
+}
+
+#[test]
+fn test_decode_import_record_types() {
+    let data = sample_data();
+    let xex = xex2tractor::parse(&data).unwrap();
+    let pe_image = extract::extract_pe_image(&data, &xex).unwrap();
+
+    let resolved = imports::decode_import_records(&pe_image, &xex).unwrap();
+
+    let variables = resolved
+        .iter()
+        .filter(|r| r.record.record_type == ImportRecordType::Variable)
+        .count();
+    let thunks = resolved
+        .iter()
+        .filter(|r| r.record.record_type == ImportRecordType::Thunk)
+        .count();
+
+    // Every import should be either variable or thunk
+    assert_eq!(variables + thunks, resolved.len());
+    // Both types should be present
+    assert!(variables > 0);
+    assert!(thunks > 0);
+}
+
+#[test]
+fn test_decode_import_alternating_pattern() {
+    let data = sample_data();
+    let xex = xex2tractor::parse(&data).unwrap();
+    let pe_image = extract::extract_pe_image(&data, &xex).unwrap();
+
+    let resolved = imports::decode_import_records(&pe_image, &xex).unwrap();
+
+    // Check first few xam.xex entries: variable, thunk, variable, thunk, ...
+    let xam: Vec<_> = resolved.iter().filter(|r| r.library == "xam.xex").collect();
+    assert!(xam.len() >= 4);
+    assert_eq!(xam[0].record.record_type, ImportRecordType::Variable);
+    assert_eq!(xam[1].record.record_type, ImportRecordType::Thunk);
+    assert_eq!(xam[2].record.record_type, ImportRecordType::Variable);
+    assert_eq!(xam[3].record.record_type, ImportRecordType::Thunk);
+
+    // Variable and thunk for same function share the same ordinal
+    assert_eq!(xam[0].record.ordinal, xam[1].record.ordinal);
+}
+
+#[test]
+fn test_decode_import_names_resolved() {
+    let data = sample_data();
+    let xex = xex2tractor::parse(&data).unwrap();
+    let pe_image = extract::extract_pe_image(&data, &xex).unwrap();
+
+    let resolved = imports::decode_import_records(&pe_image, &xex).unwrap();
+
+    // Most imports should resolve to known names
+    let named = resolved.iter().filter(|r| r.export.is_some()).count();
+    assert!(
+        named > resolved.len() / 2,
+        "expected most imports to resolve, got {named}/{}",
+        resolved.len()
+    );
+
+    // Check a specific known import is present
+    let has_dbg_break = resolved.iter().any(|r| {
+        r.export
+            .as_ref()
+            .is_some_and(|e| e.name == "DbgBreakPoint")
+    });
+    assert!(has_dbg_break, "should find DbgBreakPoint import");
+}
+
+#[test]
+fn test_cli_inspect_shows_resolved_imports() {
+    let path = format!("{}/tests/data/default.xex", env!("CARGO_MANIFEST_DIR"));
+
+    let output = std::process::Command::new(env!("CARGO_BIN_EXE_xex2tractor"))
+        .args(["inspect", &path])
+        .output()
+        .expect("failed to run xex2tractor");
+
+    assert!(output.status.success());
+    let stdout = String::from_utf8_lossy(&output.stdout);
+    assert!(
+        stdout.contains("Resolved Imports"),
+        "inspect should show resolved imports section"
+    );
+    assert!(
+        stdout.contains("xboxkrnl.exe"),
+        "inspect should show xboxkrnl.exe imports"
+    );
+    assert!(
+        stdout.contains("xam.xex"),
+        "inspect should show xam.xex imports"
+    );
+}