Add Windows SPTI backend, CI check, platform support complete

- scsi/windows.rs: SCSI_PASS_THROUGH_DIRECT via DeviceIoControl
- Device path normalization (D:, \\.\CdRom0, \\.\D:)
- Windows drive discovery (CdRom0-15 + drive letters)
- CI: cargo check on windows-latest
- Platform table: Linux + macOS + Windows all supported

src/drive.rs

@@ -168,20 +168,25 @@ impl SectorReader for DriveSession {
 }
 
 pub fn find_drives() -> Vec<(String, DriveId)> {
-    let mut drives = Vec::new();
-    for i in 0..16 {
-        let path = format!("/dev/sg{}", i);
-        if !std::path::Path::new(&path).exists() { continue; }
-        if let Ok(mut transport) = crate::scsi::open(std::path::Path::new(&path)) {
-            if let Ok(id) = DriveId::from_drive(transport.as_mut()) {
-                // Include all optical drives (peripheral device type 0x05)
-                if id.raw_inquiry.len() > 0 && (id.raw_inquiry[0] & 0x1F) == 0x05 {
-                    drives.push((path, id));
+    #[cfg(target_os = "windows")]
+    { crate::scsi::windows::find_drives() }
+
+    #[cfg(not(target_os = "windows"))]
+    {
+        let mut drives = Vec::new();
+        for i in 0..16 {
+            let path = format!("/dev/sg{}", i);
+            if !std::path::Path::new(&path).exists() { continue; }
+            if let Ok(mut transport) = crate::scsi::open(std::path::Path::new(&path)) {
+                if let Ok(id) = DriveId::from_drive(transport.as_mut()) {
+                    if id.raw_inquiry.len() > 0 && (id.raw_inquiry[0] & 0x1F) == 0x05 {
+                        drives.push((path, id));
+                    }
                 }
             }
         }
+        drives
     }
-    drives
 }
 
 pub fn find_drive() -> Option<String> {
@@ -189,6 +194,13 @@ pub fn find_drive() -> Option<String> {
 }
 
 pub fn resolve_device(path: &str) -> Result<(String, Option<String>)> {
+    // Windows: drive letters, CdRom paths, UNC paths — pass through directly
+    #[cfg(target_os = "windows")]
+    {
+        return Ok((crate::scsi::windows::normalize_device_path(path), None));
+    }
+
+    #[cfg(not(target_os = "windows"))]
     if path.contains("/sg") {
         if !std::path::Path::new(path).exists() {
             return Err(Error::DeviceNotFound { path: path.to_string() });

src/scsi/mod.rs

@@ -3,12 +3,14 @@
 //! Platform backends are in separate files:
 //!   - `linux.rs` — SG_IO ioctl
 //!   - `macos.rs` — IOKit SCSITaskDeviceInterface
-//!   - `windows.rs` — SPTI (planned)
+//!   - `windows.rs` — SPTI (SCSI Pass-Through Interface)
 
 #[cfg(target_os = "linux")]
 mod linux;
 #[cfg(target_os = "macos")]
 mod macos;
+#[cfg(target_os = "windows")]
+pub(crate) mod windows;
 
 #[allow(unused_imports)]
 use crate::error::{Error, Result};
@@ -71,7 +73,7 @@ pub fn open(device: &Path) -> Result<Box<dyn ScsiTransport>> {
     { Ok(Box::new(macos::MacScsiTransport::open(device)?)) }
 
     #[cfg(target_os = "windows")]
-    { Err(Error::DeviceNotFound { path: format!("{}: Windows not yet supported", device.display()) }) }
+    { Ok(Box::new(windows::SptiTransport::open(device)?)) }
 
     #[cfg(not(any(target_os = "linux", target_os = "macos", target_os = "windows")))]
     { Err(Error::DeviceNotFound { path: format!("{}: unsupported platform", device.display()) }) }

src/scsi/windows.rs

@@ -0,0 +1,277 @@
+//! Windows SCSI transport via SPTI (SCSI Pass-Through Interface).
+//!
+//! Sends SCSI commands through DeviceIoControl with IOCTL_SCSI_PASS_THROUGH_DIRECT.
+//! Accepts device paths like `D:`, `E:`, `\\.\CdRom0`, or `\\.\D:`.
+//!
+//! Requires administrator privileges for raw SCSI access.
+
+use crate::error::{Error, Result};
+use super::{DataDirection, ScsiResult, ScsiTransport};
+use std::path::Path;
+
+// ── Windows constants ──────────────────────────────────────────────────────
+
+const IOCTL_SCSI_PASS_THROUGH_DIRECT: u32 = 0x4D014;
+const SCSI_IOCTL_DATA_OUT: u8 = 0;
+const SCSI_IOCTL_DATA_IN: u8 = 1;
+const SCSI_IOCTL_DATA_UNSPECIFIED: u8 = 2;
+
+const GENERIC_READ: u32 = 0x80000000;
+const GENERIC_WRITE: u32 = 0x40000000;
+const FILE_SHARE_READ: u32 = 0x00000001;
+const FILE_SHARE_WRITE: u32 = 0x00000002;
+const OPEN_EXISTING: u32 = 3;
+const FILE_ATTRIBUTE_NORMAL: u32 = 0x80;
+const INVALID_HANDLE_VALUE: isize = -1;
+
+const K_MAX_CDB_SIZE: usize = 16;
+const K_SENSE_SIZE: usize = 32;
+
+// ── SCSI_PASS_THROUGH_DIRECT structure ─────────────────────────────────────
+
+#[repr(C)]
+#[allow(non_snake_case)]
+struct ScsiPassThroughDirect {
+    Length: u16,
+    ScsiStatus: u8,
+    PathId: u8,
+    TargetId: u8,
+    Lun: u8,
+    CdbLength: u8,
+    SenseInfoLength: u8,
+    DataIn: u8,
+    _padding1: [u8; 3],
+    DataTransferLength: u32,
+    TimeOutValue: u32,
+    DataBuffer: *mut u8,
+    SenseInfoOffset: u32,
+    Cdb: [u8; K_MAX_CDB_SIZE],
+}
+
+#[repr(C)]
+struct SptwbDirect {
+    spt: ScsiPassThroughDirect,
+    sense: [u8; K_SENSE_SIZE],
+}
+
+// ── Windows FFI ────────────────────────────────────────────────────────────
+
+extern "system" {
+    fn CreateFileW(
+        lpFileName: *const u16,
+        dwDesiredAccess: u32,
+        dwShareMode: u32,
+        lpSecurityAttributes: *const std::ffi::c_void,
+        dwCreationDisposition: u32,
+        dwFlagsAndAttributes: u32,
+        hTemplateFile: *const std::ffi::c_void,
+    ) -> isize;
+
+    fn CloseHandle(hObject: isize) -> i32;
+
+    fn DeviceIoControl(
+        hDevice: isize,
+        dwIoControlCode: u32,
+        lpInBuffer: *mut std::ffi::c_void,
+        nInBufferSize: u32,
+        lpOutBuffer: *mut std::ffi::c_void,
+        nOutBufferSize: u32,
+        lpBytesReturned: *mut u32,
+        lpOverlapped: *mut std::ffi::c_void,
+    ) -> i32;
+}
+
+// ── Transport implementation ───────────────────────────────────────────────
+
+pub struct SptiTransport {
+    handle: isize,
+}
+
+impl SptiTransport {
+    pub fn open(device: &Path) -> Result<Self> {
+        let dev_str = device.to_str().ok_or_else(|| Error::DeviceNotFound {
+            path: device.display().to_string(),
+        })?;
+
+        // Normalize device path to \\.\X: format
+        let win_path = normalize_device_path(dev_str);
+        let wide: Vec<u16> = win_path.encode_utf16().chain(std::iter::once(0)).collect();
+
+        let handle = unsafe {
+            CreateFileW(
+                wide.as_ptr(),
+                GENERIC_READ | GENERIC_WRITE,
+                FILE_SHARE_READ | FILE_SHARE_WRITE,
+                std::ptr::null(),
+                OPEN_EXISTING,
+                FILE_ATTRIBUTE_NORMAL,
+                std::ptr::null(),
+            )
+        };
+
+        if handle == INVALID_HANDLE_VALUE {
+            return Err(Error::DeviceNotFound {
+                path: format!("{}: cannot open device (run as administrator)", dev_str),
+            });
+        }
+
+        Ok(SptiTransport { handle })
+    }
+}
+
+impl Drop for SptiTransport {
+    fn drop(&mut self) {
+        unsafe { CloseHandle(self.handle); }
+    }
+}
+
+impl ScsiTransport for SptiTransport {
+    fn execute(
+        &mut self,
+        cdb: &[u8],
+        direction: DataDirection,
+        data: &mut [u8],
+        timeout_ms: u32,
+    ) -> Result<ScsiResult> {
+        let mut sptwb: SptwbDirect = unsafe { std::mem::zeroed() };
+
+        let cdb_len = cdb.len().min(K_MAX_CDB_SIZE);
+        sptwb.spt.Length = std::mem::size_of::<ScsiPassThroughDirect>() as u16;
+        sptwb.spt.CdbLength = cdb_len as u8;
+        sptwb.spt.SenseInfoLength = K_SENSE_SIZE as u8;
+        sptwb.spt.DataIn = match direction {
+            DataDirection::None => SCSI_IOCTL_DATA_UNSPECIFIED,
+            DataDirection::FromDevice => SCSI_IOCTL_DATA_IN,
+            DataDirection::ToDevice => SCSI_IOCTL_DATA_OUT,
+        };
+        sptwb.spt.DataTransferLength = data.len() as u32;
+        sptwb.spt.TimeOutValue = (timeout_ms / 1000).max(1) as u32;
+        sptwb.spt.DataBuffer = if data.is_empty() { std::ptr::null_mut() } else { data.as_mut_ptr() };
+        sptwb.spt.SenseInfoOffset = std::mem::offset_of!(SptwbDirect, sense) as u32;
+        sptwb.spt.Cdb[..cdb_len].copy_from_slice(&cdb[..cdb_len]);
+
+        let buf_size = std::mem::size_of::<SptwbDirect>() as u32;
+        let mut bytes_returned: u32 = 0;
+
+        let ok = unsafe {
+            DeviceIoControl(
+                self.handle,
+                IOCTL_SCSI_PASS_THROUGH_DIRECT,
+                &mut sptwb as *mut _ as *mut std::ffi::c_void,
+                buf_size,
+                &mut sptwb as *mut _ as *mut std::ffi::c_void,
+                buf_size,
+                &mut bytes_returned,
+                std::ptr::null_mut(),
+            )
+        };
+
+        if ok == 0 {
+            return Err(Error::ScsiError {
+                opcode: cdb[0],
+                status: 0xFF,
+                sense_key: 0,
+            });
+        }
+
+        if sptwb.spt.ScsiStatus != 0 {
+            let sense_key = if sptwb.sense[2] != 0 { sptwb.sense[2] & 0x0F } else { 0 };
+            return Err(Error::ScsiError {
+                opcode: cdb[0],
+                status: sptwb.spt.ScsiStatus,
+                sense_key,
+            });
+        }
+
+        let mut sense = [0u8; 32];
+        sense.copy_from_slice(&sptwb.sense);
+
+        Ok(ScsiResult {
+            status: sptwb.spt.ScsiStatus,
+            bytes_transferred: sptwb.spt.DataTransferLength as usize,
+            sense,
+        })
+    }
+}
+
+// ── Device path helpers ────────────────────────────────────────────────────
+
+/// Normalize a device path to Windows \\.\X: format.
+///
+/// Accepts: "D:", "D:\\", "\\.\D:", "\\.\CdRom0"
+pub(crate) fn normalize_device_path(path: &str) -> String {
+    // Already in \\.\X format
+    if path.starts_with("\\\\.\\") {
+        return path.to_string();
+    }
+
+    // Single drive letter: "D:" or "D:\"
+    let trimmed = path.trim_end_matches('\\');
+    if trimmed.len() == 2 && trimmed.as_bytes()[1] == b':' {
+        return format!("\\\\.\\{}", trimmed);
+    }
+
+    // CdRomN format
+    if path.to_lowercase().starts_with("cdrom") {
+        return format!("\\\\.\\{}", path);
+    }
+
+    // Fallback: wrap in \\.\
+    format!("\\\\.\\{}", path)
+}
+
+/// Find all optical drives on Windows.
+/// Scans drive letters A-Z and CdRom0-15.
+pub fn find_drives() -> Vec<(String, crate::identity::DriveId)> {
+    let mut drives = Vec::new();
+
+    // Try CdRom0..CdRom15
+    for i in 0..16 {
+        let path = format!("\\\\.\\CdRom{}", i);
+        if let Ok(mut transport) = SptiTransport::open(Path::new(&path)) {
+            if let Ok(id) = crate::identity::DriveId::from_drive(&mut transport) {
+                if !id.raw_inquiry.is_empty() && (id.raw_inquiry[0] & 0x1F) == 0x05 {
+                    drives.push((path, id));
+                }
+            }
+        }
+    }
+
+    // Also try drive letters if CdRom didn't find anything
+    if drives.is_empty() {
+        for letter in b'D'..=b'Z' {
+            let path = format!("{}:", letter as char);
+            if let Ok(mut transport) = SptiTransport::open(Path::new(&path)) {
+                if let Ok(id) = crate::identity::DriveId::from_drive(&mut transport) {
+                    if !id.raw_inquiry.is_empty() && (id.raw_inquiry[0] & 0x1F) == 0x05 {
+                        drives.push((path, id));
+                    }
+                }
+            }
+        }
+    }
+
+    drives
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn normalize_drive_letter() {
+        assert_eq!(normalize_device_path("D:"), "\\\\.\\D:");
+        assert_eq!(normalize_device_path("E:\\"), "\\\\.\\E:");
+    }
+
+    #[test]
+    fn normalize_already_prefixed() {
+        assert_eq!(normalize_device_path("\\\\.\\D:"), "\\\\.\\D:");
+        assert_eq!(normalize_device_path("\\\\.\\CdRom0"), "\\\\.\\CdRom0");
+    }
+
+    #[test]
+    fn normalize_cdrom() {
+        assert_eq!(normalize_device_path("CdRom0"), "\\\\.\\CdRom0");
+    }
+}