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// SPDX-License-Identifier: ISC
// SPDX-FileCopyrightText: 2024 Matthew Wozniak <me@woz.blue>
#define NO_EXTERNS
#include "api.h"
#undef NO_EXTERNS
#include "os.h"
#include "log.h"
#include "sst/x86.h"
struct engserver *engserver = NULL;
struct engclient *engclient = NULL;
struct demoplayer *demoplayer = NULL;
void (*cbuf_addtext)(char *) = NULL;
bool api_init(void) {
void *engine_dll = os_dlhandle("engine");
createinterface_func engine_factory =
(createinterface_func)os_dlsym(engine_dll, "CreateInterface");
if (!engine_factory) bail("couldn't get engine factory");
engserver = engine_factory(INTERFACEVERSION_VENGINESERVER, NULL);
if (!engserver) bail("couldn't get IVEngineServer from engine");
engclient = engine_factory(VENGINE_CLIENT_INTERFACE_VERSION, NULL);
if (!engclient) bail("couldn't get IVEngineClient from engine");
// find cbuf_addtext
const u8 *instr = (const u8 *)engserver->vt->server_command;
// ServerCommand() calls a few small functions before Cbuf_AddText but they
// get inlined. look for 'push esi' and then a call.
for (const u8 *p = instr; p - instr < 64;) {
if (*p == X86_PUSHESI && *++p == X86_CALL) {
// jump is relative to after the instruction
cbuf_addtext = (void (*)(char *))(p + 5 + *(i32 *)(p + 1));
}
int l = x86_len(p);
if (l == -1)
bail("invalid instruction looking for cbuf_addtext");
p += l;
}
if (!cbuf_addtext) bail("couldn't find cbuf_addtext");
// find demoplayer
instr = (const u8 *)engclient->vt->is_playing_demo;
debug("is_playing_demo = %p", (void *)instr);
// CEngineClient::IsPlayingDemo is a wrapper around a demoplayer call
// The first thing it does should be load demoplayer into ECX
if (instr[0] != X86_MOVRMW || instr[1] != X86_MODRM(0, 1, 5))
bail("couldn't get demoplayer");
demoplayer = **(struct demoplayer ***)(instr + 2);
debug("demoplayer = %p", (void *)demoplayer);
return true;
}
// vi: sw=4 ts=4 noet tw=80 cc=80
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