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otoca: patch up game for printing holo cards (#726)

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## Link to GitHub Issue or related Pull Request, if one exists
Fixes #154

## Description of change
Patch the game to skip over special holo printing logic and redirect to
the normal printer, resolving the soft lock + printer failure.

## Testing
Tested `NCG-2019012900`. Other versions might not work though since this
is patch-based not hook-based.
This commit is contained in:
bicarus
2026-05-31 23:08:17 -07:00
committed by GitHub
parent 84ea3f9e8e
commit 6fef16353e
1 changed files with 74 additions and 0 deletions
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src/spice2x/games/otoca/otoca.cpp
+74
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@@ -4,6 +4,7 @@
#include "util/detour.h"
#include "util/libutils.h"
#include "util/logging.h"
#include "util/sigscan.h"
#define OTOCA_DEBUG_VERBOSE 0
#if OTOCA_DEBUG_VERBOSE
@@ -116,6 +117,73 @@ namespace games::otoca {
return ret;
}
static void patch_holo_print_hang() {
// arkkep.dll's print method sets the printer busy (0x66 / Printing_Busy),
// then bails out with -1 WITHOUT printing when its holo parameter is
// nonzero (the card path passes 0 and works). The completion callback that
// clears busy never fires, so the page's poll loop spins forever -> hang.
// The image band is already built, so flip the je that skips the bail-out
// into a jmp (74 -> EB) to route holo through the print path like card.
//
// je issue_print ; <- patched to jmp
// or eax, -1 ; holo: return without printing
// ret 10h
auto arkkep = libutils::try_module("arkkep.dll");
if (arkkep == nullptr) {
log_warning("otoca", "arkkep.dll not loaded; skipping holo print hang fix");
return;
}
auto result = replace_pattern(
arkkep,
"C7465866000000895DC0C74710080700007416",
"C7465866000000895DC0C7471008070000EB16",
0, 0);
if (result) {
log_info("otoca", "patched hologram print hang in arkkep.dll");
} else {
log_warning("otoca", "could not patch hologram print hang (incompatible arkkep.dll?)");
}
}
static void patch_holo_print_search() {
// before printing, arkkep walks the page's printer list looking for one
// whose capability flag (byte at entry+120h) matches the job type
// (0 = card, 1 = holo). Our emulated printer is only card-capable, so a
// holo job finds no match and aborts without printing ("not found holo
// printer"). The emulated printer serves both media, so force the compare
// to always match by turning `cmp cl,[edi+120h]` into `cmp cl,cl` + NOPs,
// which always sets ZF. Two such compares exist, so patch both.
//
// cmp cl, [edi+120h] ; <- patched to `cmp cl,cl` (3A 8F.. -> 3A C9..)
// je printer_found
auto arkkep = libutils::try_module("arkkep.dll");
if (arkkep == nullptr) {
log_warning("otoca", "arkkep.dll not loaded; skipping holo print search fix");
return;
}
int patched = 0;
while (patched < 2) {
auto result = replace_pattern(
arkkep,
"3A8F20010000",
"3AC990909090",
0, 0);
if (!result) {
break;
}
patched++;
}
if (patched > 0) {
log_info("otoca", "patched hologram printer search in arkkep.dll ({} site(s))", patched);
} else {
log_warning("otoca", "could not patch hologram printer search (incompatible arkkep.dll?)");
}
}
void OtocaGame::attach() {
Game::attach();
@@ -129,6 +197,12 @@ namespace games::otoca {
p4io_hook();
games::shared::printer_attach();
// fix hologram print hard hang in arkkep.dll
patch_holo_print_hang();
// make hologram jobs find the emulated printer (else they abort unprinted)
patch_holo_print_search();
if (BYPASS_CAMERA) {
libutils::try_library("libcamera.dll");
const auto libcamera = "libcamera.dll";