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mxaccess/analysis/ghidra/exports/LmxProxy.dll.mxstatus-safearray-decompile.md
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Joseph Doherty 460c61df43 [R3/R4] Path-A trace: synthesizer is in Lmx.dll's NMX-frame decoder 
Five-stage Ghidra headless decompile traces the byte-to-MXSTATUS_PROXY
synthesis path end-to-end across LmxProxy.dll and Lmx.dll. New evidence
files committed alongside R3/R4 verdict update:

- analysis/ghidra/exports/LmxProxy.dll.fire-event-xrefs.md
- analysis/ghidra/exports/LmxProxy.dll.status-synthesis-decompile.md
- analysis/ghidra/exports/LmxProxy.dll.mxstatus-safearray-decompile.md
- analysis/ghidra/exports/Lmx.dll.set-attribute-result-decompile.md

Layer-by-layer findings (bytes flow inward; synthesis flows outward):

1. `Lmx.aaDCT` at 0x10178fc0 is `SysAllocString(L"Lmx.aaDCT")` — a
   tracing category BSTR, not a table.
2. `MXSTATUS_PROXY` is a 16-byte marshalled struct (4 × i16 padded
   to i32 boundaries with Pack=4) — the OUTPUT of synthesis, not a
   lookup entry.
3. `LmxProxy.dll` Fire_* event handlers receive already-populated
   `MXSTATUS_PROXY[]` and forward through ATL dispatch — no synthesis.
4. `LmxProxy.dll` Fire_* CALLERS (FUN_1001657f / FUN_10016b50 /
   FUN_10016d4b) call FUN_10003f60(out_safearray, in_status_ptr,
   count=1) which is a VERBATIM memcpy of an existing 14-byte buffer
   into the SAFEARRAY — no transformation.
5. `Lmx.dll`'s `PreboundReference::OnSetAttributeResult` (FUN_10114a90)
   receives an already-populated `short *param_7` status buffer. Log
   line confirms the layout: `<success %d category %d detectedBy %d
   detail %d>`. Dispatches on typed values — synthesis is upstream of
   this function too.

The synthesizer is the NMX-frame decoder in Lmx.dll that calls
OnSetAttributeResult / OnGetAttributeResult / equivalent
OperationComplete handler. The decoder takes raw NMX bytes plus
operation context (item handle, engine state, retry state,
correlation id) and computes the populated MXSTATUS_PROXY. There is
NO static lookup table — synthesis is per-message contextual.

Two viable paths to typed promotion (both substantial; neither a
small codec patch):

- Path A: port the synthesizer. ~1-2 weeks. Requires extending the
  Rust session to track per-operation context (handles, retries,
  correlation ids). Out of V1 scope.
- Path B: empirical capture pairs. ~30 min × 6-10 scenarios. Output
  is a (byte, context → status) mapping that approximates without
  re-implementing. Risk: mapping is only valid for captured contexts.

R3/R4 stay settled at verbatim-preserve. The .NET reference does
the same for the same reason: the synthesizer is too context-
dependent to mirror without porting the entire operation-tracking
state machine.

Reopen criteria sharpened: either (a) a consumer files a concrete
use case for typed promotion of a specific byte+context combination
(Path B's empirical capture for that one combination is the cheapest
answer); or (b) a major-version bump justifies the state-machine
port (Path A).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-05-06 06:33:02 -04:00

4.1 KiB
Raw Blame History

LmxProxy.dll selected decompile

FUN_10003f60 at 10003f60

Signature: HRESULT __cdecl FUN_10003f60(undefined4 * param_1, undefined2 * param_2, ULONG param_3)


HRESULT __cdecl FUN_10003f60(undefined4 *param_1,undefined2 *param_2,ULONG param_3)

{
  basic_ostream<wchar_t,struct_std::char_traits<wchar_t>_> bVar1;
  HRESULT HVar2;
  basic_ostream<wchar_t,struct_std::char_traits<wchar_t>_> *pbVar3;
  SAFEARRAY *pSVar4;
  HRESULT HVar5;
  _func_basic_ostream<wchar_t,struct_std::char_traits<wchar_t>_>_ptr_basic_ostream<wchar_t,struct_std::char_traits<wchar_t>_>_ptr
  *p_Var6;
  SAFEARRAYBOUND local_18;
  LONG local_10;
  IRecordInfo *local_c;
  undefined2 *local_8;
  
  local_c = (IRecordInfo *)0x0;
  HVar2 = GetRecordInfoFromGuids((GUID *)&DAT_1001c2d0,1,0,0,(GUID *)&DAT_1001b530,&local_c);
  if (HVar2 < 0) {
    if ((HVar2 != -0x7ffd7fe3) &&
       (bVar1 = FUN_10003f01(*(basic_ostream<wchar_t,struct_std::char_traits<wchar_t>_> **)
                              (DAT_100294e0 + 4)),
       bVar1 != (basic_ostream<wchar_t,struct_std::char_traits<wchar_t>_>)0x0)) {
      HVar5 = HVar2;
      p_Var6 = endl_exref;
      pbVar3 = (basic_ostream<wchar_t,struct_std::char_traits<wchar_t>_> *)
               FUN_10002dbf(*(int **)(DAT_100294e0 + 4),L"GetRecordInfoFromGuids failed - hr = ");
      pbVar3 = std::basic_ostream<wchar_t,struct_std::char_traits<wchar_t>_>::operator<<
                         (pbVar3,HVar5);
      std::basic_ostream<wchar_t,struct_std::char_traits<wchar_t>_>::operator<<(pbVar3,p_Var6);
    }
  }
  else {
    local_18.lLbound = 0;
    local_18.cElements = param_3;
    pSVar4 = SafeArrayCreateEx(0x24,1,&local_18,local_c);
    *param_1 = pSVar4;
    (*local_c->lpVtbl->Release)(local_c);
    if ((SAFEARRAY *)*param_1 == (SAFEARRAY *)0x0) {
      HVar2 = -0x7fffbffb;
    }
    else {
      HVar2 = SafeArrayGetLBound((SAFEARRAY *)*param_1,1,&local_10);
      if ((-1 < HVar2) && (HVar2 = SafeArrayAccessData((SAFEARRAY *)*param_1,&local_8), -1 < HVar2))
      {
        *local_8 = *param_2;
        *(undefined4 *)(local_8 + 2) = *(undefined4 *)(param_2 + 2);
        *(undefined4 *)(local_8 + 4) = *(undefined4 *)(param_2 + 4);
        local_8[6] = param_2[6];
        SafeArrayUnaccessData((SAFEARRAY *)*param_1);
        HVar2 = 0;
      }
    }
  }
  return HVar2;
}

FUN_10015db2 at 10015db2

Signature: void * __thiscall FUN_10015db2(void * this, int * param_1, undefined4 param_2, undefined4 param_3, undefined4 param_4, undefined4 param_5, undefined4 param_6)


/* WARNING: Function: __EH_prolog3 replaced with injection: EH_prolog3 */
/* WARNING: Function: __EH_epilog3 replaced with injection: EH_epilog3 */

void * __thiscall
FUN_10015db2(void *this,int *param_1,undefined4 param_2,undefined4 param_3,undefined4 param_4,
            undefined4 param_5,undefined4 param_6)

{
  *(undefined4 *)this = 1;
  FUN_10015d38((void *)((int)this + 4),param_1);
  *(undefined4 *)((int)this + 8) = 0;
  *(undefined4 *)((int)this + 0x10) = param_2;
  *(undefined4 *)((int)this + 0x14) = param_3;
  *(undefined4 *)((int)this + 0x18) = param_4;
  *(undefined4 *)((int)this + 0xc) = param_6;
  *(undefined4 *)((int)this + 0x1c) = param_5;
  *(undefined4 *)((int)this + 0x20) = 0;
  return this;
}

FUN_10015e4e at 10015e4e

Signature: void * __thiscall FUN_10015e4e(void * this, int * param_1, undefined4 param_2, undefined4 param_3, undefined4 param_4, undefined4 param_5, undefined4 param_6)


/* WARNING: Function: __EH_prolog3 replaced with injection: EH_prolog3 */
/* WARNING: Function: __EH_epilog3 replaced with injection: EH_epilog3 */

void * __thiscall
FUN_10015e4e(void *this,int *param_1,undefined4 param_2,undefined4 param_3,undefined4 param_4,
            undefined4 param_5,undefined4 param_6)

{
  *(undefined4 *)this = 2;
  *(undefined4 *)((int)this + 4) = 0;
  FUN_10015d38((void *)((int)this + 8),param_1);
  *(undefined4 *)((int)this + 0x20) = 0;
  *(undefined4 *)((int)this + 0x10) = param_2;
  *(undefined4 *)((int)this + 0x14) = param_3;
  *(undefined4 *)((int)this + 0x18) = param_4;
  *(undefined4 *)((int)this + 0xc) = param_6;
  *(undefined4 *)((int)this + 0x1c) = param_5;
  return this;
}
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