split ffi crate to support distinct 16, 32, and 64-bit builds

initial work to optionally discard any instruction printing support

when using `-Z build-std` to fully remove .eh_frame, a stripped
long_mode_no_fmt .so is 61kb!

1 files changed, 35 insertions, 0 deletions

diff --git a/ffi/src/real_mode.rs b/ffi/src/real_mode.rs
new file mode 100644
index 0000000..6a5f866
--- /dev/null
+++ b/ffi/src/real_mode.rs
@@ -0,0 +1,35 @@
+use yaxpeax_arch::{Arch, Decoder, LengthedInstruction, AddressBase};
+use yaxpeax_x86::real_mode;
+
+#[no_mangle]
+pub unsafe extern "C" fn yaxpeax_x86_16_decode_optimistic(data: *const u8, length: u64, inst: *mut real_mode::Instruction) -> bool {
+    let inst: &mut real_mode::Instruction = core::mem::transmute(inst);
+    <real_mode::Arch as Arch>::Decoder::default().decode_into(inst, core::slice::from_raw_parts(data as *const u8, length as usize).iter().cloned()).is_err()
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn yaxpeax_x86_16_instr_length(inst: *mut real_mode::Instruction) -> usize {
+    let inst: &mut real_mode::Instruction = core::mem::transmute(inst);
+    0.wrapping_offset(inst.len()).to_linear()
+}
+
+#[cfg(fmt)]
+mod write_sink;
+
+#[cfg(fmt)]
+mod fmt {
+    use write_sink::InstructionSink;
+
+    use core::fmt::Write;
+
+    #[no_mangle]
+    pub unsafe extern "C" fn yaxpeax_x86_16_fmt(inst: *mut real_mode::Instruction, text: *mut u8, len: usize) {
+        let inst: &mut real_mode::Instruction = core::mem::transmute(inst);
+        let res = core::slice::from_raw_parts_mut(text, len);
+
+        write!(InstructionSink { buf: res, offs: 0 }, "{}", inst).unwrap();
+    }
+}
+
+#[cfg(fmt)]
+pub use fmt::yaxpeax_x86_16_fmt;