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disable_keysound working for eclale and bugfix

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CrazyRedMachine 2023-07-27 15:56:44 +02:00
parent e0a7a650e6
commit 2f11cdea2b
1 changed files with 151 additions and 7 deletions
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158
popnhax/dllmain.cc
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@ -2139,12 +2139,154 @@ static bool patch_enhanced_polling(uint8_t debounce)
void (*real_chart_load)();
void patch_chart_load_old() {
/* This is mostly the same patch as the new version, except :
* - eax and ecx have a different interpretation
* - a chart chunk is only 2 dwords
*/
__asm("cmp word ptr [edi+eax*8+4], 0x245\n");
__asm("jne not_keysound_old\n");
__asm("mov word ptr [edi+eax*8+4], 0x745\n");
__asm("not_keysound_old:\n");
__asm("jne old_patch_chart_load_end\n");
/* keysound event has been found, we need to convert timestamp */
__asm("mov word ptr [edi+eax*8+4], 0x745\n"); // we'll undo it if we cannot apply it
__asm("push eax\n"); // we'll convert to store chunk pointer (keysound timestamp at beginning)
__asm("push ebx\n"); // we'll store a copy of our chunk pointer there
__asm("push edx\n"); // we'll store the button info there
__asm("push esi\n"); // we'll store chart growth for part2 subroutine there
__asm("push ecx\n"); // we'll convert to store remaining chunks
/* Convert eax,ecx registers to same format as later games so the rest of the patch is similar
* TODO: factorize
*/
__asm("sub ecx, eax\n"); // ecx is now remaining chunks rather than chart size
__asm("imul eax, 8\n");
__asm("add eax, edi\n"); //now eax is chunk pointer
/* PART1: check button associated with keysound, then look for next note event for this button */
__asm("xor dx, dx\n");
__asm("mov dl, byte ptr [eax+7]\n");
__asm("shr edx, 4\n"); //dl now contains button value ( 00-08 )
__asm("mov ebx, eax\n"); //save chunk pointer into ebx for our rep movsd when a match is found
__asm("old_next_chart_chunk:\n");
__asm("add eax, 0x8\n"); // +0x08 in old chart format
__asm("sub ecx, 1\n");
__asm("jz old_end_of_chart\n");
__asm("cmp word ptr [eax+4], 0x145\n");
__asm("jne old_next_chart_chunk\n");
/* found note event */
__asm("cmp dl, byte ptr [eax+6]\n");
__asm("jne old_next_chart_chunk\n");
/* found MATCHING note event */
__asm("mov edx, dword ptr [ebx+4]\n"); //save operation (we need to shift the whole block first)
/* move the whole block just before the note event to preserve timestamp ordering */
__asm("push ecx\n");
__asm("push esi\n");
__asm("push edi\n");
__asm("mov edi, ebx\n");
__asm("mov esi, ebx\n");
__asm("add esi, 0x08\n");
__asm("mov ecx, eax\n");
__asm("sub ecx, 0x08\n");
__asm("sub ecx, ebx\n");
__asm("shr ecx, 2\n"); //div by 4 (sizeof dword)
__asm("rep movsd\n");
__asm("pop edi\n");
__asm("pop esi\n");
__asm("pop ecx\n");
/* write the 0x745 event just before our matching 0x145 which eax points to */
__asm("mov dword ptr [eax-0x08+0x04], edx\n"); // operation
__asm("mov edx, dword ptr [eax]\n");
__asm("mov dword ptr [eax-0x08], edx\n"); // timestamp
/* PART2: Look for other instances of same button key events (0x0145) before the keysound is detached */
__asm("xor esi, esi\n"); //init chart growth counter
/* look for next note event for same button */
__asm("mov ebx, dword ptr [eax-0x08+0x04]\n"); //operation copy
__asm("mov dl, byte ptr [eax+6]\n"); //dl now contains button value ( 00-08 )
__asm("old_next_same_note_chunk:\n");
__asm("add eax, 0x8\n");
__asm("sub ecx, 1\n");
__asm("jz old_end_of_same_note_search\n"); //end of chart reached
__asm("cmp word ptr [eax+4], 0x245\n");
__asm("jne old_check_if_note_event\n"); //still need to check 0x145..
__asm("push ecx\n");
__asm("xor cx, cx\n");
__asm("mov cl, byte ptr [eax+7]\n");
__asm("shr ecx, 4\n"); //cl now contains button value ( 00-08 )
__asm("cmp cl, dl\n");
__asm("pop ecx");
__asm("jne old_check_if_note_event\n"); // 0x245 but not our button, still need to check 0x145..
__asm("jmp old_end_of_same_note_search\n"); // found matching 0x245 (keysound change for this button), we can stop search
__asm("old_check_if_note_event:\n");
__asm("cmp word ptr [eax+4], 0x145\n");
__asm("jne old_next_same_note_chunk\n");
__asm("cmp dl, byte ptr [eax+6]\n");
__asm("jne old_next_same_note_chunk\n");
//found a match! time to grow the chart..
__asm("push ecx\n");
__asm("push esi\n");
__asm("push edi\n");
__asm("mov esi, eax\n");
__asm("mov edi, eax\n");
__asm("add edi, 0x08\n");
__asm("imul ecx, 0x08\n"); //ecx is number of chunks left, we want number of bytes for now, dword later
__asm("std\n");
__asm("add esi, ecx\n");
__asm("sub esi, 0x04\n"); //must be on very last dword from chart
__asm("add edi, ecx\n");
__asm("sub edi, 0x04\n");
__asm("shr ecx, 2\n"); //div by 4 (sizeof dword)
__asm("rep movsd\n");
__asm("cld\n");
__asm("pop edi\n");
__asm("pop esi\n");
__asm("pop ecx\n");
/* write the 0x745 event copy */
// timestamp is already correct as it's leftover from the 0x145
__asm("mov dword ptr [eax+0x04], ebx\n"); // operation
__asm("add esi, 1\n"); //increase growth counter
/* ebx still contains the 0x745 operation, dl still contains button, but eax points to 0x745 rather than the 0x145 so let's fix */
/* note that remaining chunks is still correct due to growth, so no need to decrement ecx */
__asm("add eax, 0x8\n");
__asm("jmp old_next_same_note_chunk\n"); //look for next occurrence
/* KEYSOUND PROCESS END */
__asm("old_end_of_same_note_search:\n");
/* restore before next timestamp */
__asm("pop ecx\n");
__asm("add ecx, esi\n"); // take chart growth into account
__asm("pop esi\n");
__asm("pop edx\n");
__asm("pop ebx\n");
__asm("pop eax\n");
/* next iteration should revisit the same block since we shifted... anticipate the +0xC/-1/+0x64 that will be done by real_chart_load() */
__asm("sub eax, 1\n");
__asm("sub dword ptr [edi+eax*8], 0x64\n");
__asm("jmp old_patch_chart_load_end\n");
__asm("old_end_of_chart:\n");
__asm("pop ecx\n");
__asm("pop esi\n");
__asm("pop edx\n");
__asm("pop ebx\n");
__asm("pop eax\n");
__asm("mov word ptr [edi+eax*8+4], 0x245\n"); // no match found (ad-lib keysound?), restore opcode
__asm("old_patch_chart_load_end:\n");
real_chart_load();
}
void patch_chart_load() {
__asm("cmp word ptr [eax+4], 0x245\n");
__asm("jne patch_chart_load_end\n");
@ -2158,6 +2300,7 @@ void patch_chart_load() {
__asm("push ecx\n"); // remaining chunks
/* PART1: check button associated with keysound, then look for next note event for this button */
__asm("xor dx, dx\n");
__asm("mov dl, byte ptr [eax+7]\n");
__asm("shr edx, 4\n"); //dl now contains button value ( 00-08 )
@ -2291,26 +2434,27 @@ static bool patch_disable_keysound()
char *data = getDllData(g_game_dll_fn, &dllSize);
{
int64_t pattern_offset = search(data, dllSize, "\xB9\xFF\x1C\x00\x00", 5, 0);
int64_t pattern_offset = search(data, dllSize, "\x00\x00\x72\x05\xB9\xFF", 6, 0);
if (pattern_offset == -1) {
LOG("popnhax: keysound disable: cannot find offset\n");
return false;
}
/* detect if usaneko+ */
uint64_t patch_addr = (int64_t)data + pattern_offset + 0x0B;
uint64_t patch_addr = (int64_t)data + pattern_offset + 0x0F;
uint8_t check_byte = *((uint8_t *)(patch_addr + 1));
if (check_byte == 0x04)
{
LOG("popnhax: keysound disable: old game version\n");
//return false;
MH_CreateHook((LPVOID)(patch_addr), (LPVOID)patch_chart_load_old,
(void **)&real_chart_load); //turn 0x0245 opcodes into 0x0745
(void **)&real_chart_load);
}
else
{
MH_CreateHook((LPVOID)(patch_addr), (LPVOID)patch_chart_load,
(void **)&real_chart_load); //turn 0x0245 opcodes into 0x0745
(void **)&real_chart_load); //rewrite chart to get rid of keysounds
}
LOG("popnhax: no more keysounds\n");