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/*
* Copyright © Michael Smith <mikesmiffy128@gmail.com>
* Copyright © Hayden K <imaciidz@gmail.com>
* Copyright © Willian Henrique <wsimanbrazil@yahoo.com.br>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED “AS IS” AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
#include "chunklets/x86.h"
#include "engineapi.h"
#include "ent.h"
#include "feature.h"
#include "langext.h"
#include "x86util.h"
FEATURE()
REQUIRE(ent)
REQUIRE_GLOBAL(globalvars)
struct IRecipientFilter {
const struct IRecipientFilter_vtable {
void *dtor;
#ifndef _WIN32
void *dtor2;
#endif
bool (*VCALLCONV IsReliable)(struct IRecipientFilter *this);
bool (*VCALLCONV IsInitMessage)(struct IRecipientFilter *this);
int (*VCALLCONV GetRecipientCount)(struct IRecipientFilter *this);
int (*VCALLCONV GetRecipientIndex)(struct IRecipientFilter *this,
int slot);
} *vtable;
};
// this function serves as two identical functions!
static bool VCALLCONV IsReliable_IsInitMessage(struct IRecipientFilter *this) {
return false;
}
static int VCALLCONV GetRecipientCount(struct IRecipientFilter *this) {
int count = 0;
for (int i = 1; i <= globalvars->maxclients; ++i) {
// if there's an entity in a player slot, just assume there's a player.
// this is simpler than what the engine's own CBroadcastRecipientFilter
// seems to do, but holds up in practice
struct edict *e = ent_getedict(i);
if (e && e->ent_unknown) ++count;
}
return count;
}
static int VCALLCONV GetRecipientIndex(struct IRecipientFilter *this, int slot) {
if_cold (slot < 0 || slot > globalvars->maxclients) return -1;
// this isn't _particularly_ efficient (is it technically quadratic?)
// but maxplayers is never a particularly big number, so it's not really a
// big deal to do this just to send the occasional chat broadcast
for (int i = 1; i <= globalvars->maxclients; ++i) {
struct edict *e = ent_getedict(i);
if (e && e->ent_unknown && !slot--) return i;
}
return -1;
}
static const struct IRecipientFilter_vtable recipientfilter_vtable = {
0, // should never get called
#ifndef _WIN32
0, // ditto
#endif
&IsReliable_IsInitMessage,
&IsReliable_IsInitMessage,
&GetRecipientCount,
&GetRecipientIndex
};
typedef void (*UTIL_ClientPrintFilter_func)(struct IRecipientFilter *, int,
const char *, const char *, const char *, const char *, const char *);
static UTIL_ClientPrintFilter_func UTIL_ClientPrintFilter;
static bool find_UTIL_ClientPrintFilter(const uchar *insns) {
#ifdef _WIN32
for (const uchar *p = insns; p - insns < 128;) {
if (p[0] == X86_PUSHI8 && p[1] == 0x02 && p[3] == X86_CALL) {
p = p + 8 + mem_loads32(p + 4);
insns = p;
for (p = insns; p - insns < 96;) {
if (p[0] == X86_PUSHEAX && p[1] == X86_CALL) {
UTIL_ClientPrintFilter = (UTIL_ClientPrintFilter_func)(
p + 6 + mem_loads32(p + 2));
return true;
}
NEXT_INSN(p, "UTIL_ClientPrintFilter");
}
return false;
}
NEXT_INSN(p, "UTIL_ClientPrintFilter");
}
#endif
// TODO(linux): the usual code search stuff
return false;
}
void chatmsg_broadcast(const char *msg) {
struct IRecipientFilter filter = {.vtable = &recipientfilter_vtable};
UTIL_ClientPrintFilter(&filter, /*HUD_PRINTTALK*/ 3, msg, 0, 0, 0, 0);
return;
}
INIT {
struct con_cmd *cmd_ent_dump = con_findcmd("ent_dump");
if_cold (!cmd_ent_dump) return FEAT_INCOMPAT;
if_cold (!find_UTIL_ClientPrintFilter(cmd_ent_dump->cb_insns)) {
errmsg_errorx("couldn't find UTIL_ClientPrintFilter");
return FEAT_INCOMPAT;
}
return FEAT_OK;
}
// vi: sw=4 ts=4 noet tw=80 cc=80
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