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#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include "sdl2rwops.h"
#include "debug.h"
#include "wrapper.h"
#include "box64context.h"
#include "x64run.h"
#include "x64emu.h"
#include "emu/x64emu_private.h"
#include "librarian/library_private.h"
#include "bridge.h"
#include "callback.h"
#include "librarian.h"
typedef struct SDL2_RWops_s SDL2_RWops_t;
typedef int64_t (*sdl2_size)(SDL2_RWops_t *context);
typedef int64_t (*sdl2_seek)(SDL2_RWops_t *context, int64_t offset, int32_t whence);
typedef int32_t (*sdl2_read)(SDL2_RWops_t *context, void *ptr, int32_t size, int32_t maxnum);
typedef int32_t (*sdl2_write)(SDL2_RWops_t *context, const void *ptr, int32_t size, int32_t num);
typedef int32_t (*sdl2_close)(SDL2_RWops_t *context);
#define BOX64RW 0x79 // random signature value
typedef struct SDL2_RWops_s {
sdl2_size size;
sdl2_seek seek;
sdl2_read read;
sdl2_write write;
sdl2_close close;
uint32_t type;
union {
struct {
int autoclose;
FILE *fp;
} stdio;
struct {
uint8_t *base;
uint8_t *here;
uint8_t *stop;
} mem;
struct {
void *data1;
} unknown;
struct {
SDL2_RWops_t *orig;
sdl2_freerw custom_free;
} my;
} hidden;
} SDL2_RWops_t;
#define SUPER() \
GO(size, IFp) \
GO(seek, IFpIi) \
GO(read, iFppii) \
GO(write, iFppii) \
GO(close, iFp)
EXPORT int64_t my2_native_size(SDL2_RWops_t *context)
{
return context->hidden.my.orig->size(context->hidden.my.orig);
}
EXPORT int64_t my2_native_seek(SDL2_RWops_t *context, int64_t offset, int32_t whence)
{
return context->hidden.my.orig->seek(context->hidden.my.orig, offset, whence);
}
EXPORT int32_t my2_native_read(SDL2_RWops_t *context, void *ptr, int32_t size, int32_t maxnum)
{
return context->hidden.my.orig->read(context->hidden.my.orig, ptr, size, maxnum);
}
EXPORT int32_t my2_native_write(SDL2_RWops_t *context, const void *ptr, int32_t size, int32_t num)
{
return context->hidden.my.orig->write(context->hidden.my.orig, ptr, size, num);
}
EXPORT int32_t my2_native_close(SDL2_RWops_t *context)
{
int32_t ret = context->hidden.my.orig->close(context->hidden.my.orig);
context->hidden.my.custom_free(context);
return ret;
}
EXPORT int64_t my2_emulated_size(SDL2_RWops_t *context)
{
return (int64_t)RunFunctionFmt((uintptr_t)context->hidden.my.orig->size, "p", context->hidden.my.orig);
}
EXPORT int64_t my2_emulated_seek(SDL2_RWops_t *context, int64_t offset, int32_t whence)
{
return (int64_t)RunFunctionFmt((uintptr_t)context->hidden.my.orig->seek, "pIi", context->hidden.my.orig, offset, whence);
}
EXPORT int32_t my2_emulated_read(SDL2_RWops_t *context, void *ptr, int32_t size, int32_t maxnum)
{
return (int32_t)RunFunctionFmt((uintptr_t)context->hidden.my.orig->read, "ppii", context->hidden.my.orig, ptr, size, maxnum);
}
EXPORT int32_t my2_emulated_write(SDL2_RWops_t *context, const void *ptr, int32_t size, int32_t num)
{
return (int32_t)RunFunctionFmt((uintptr_t)context->hidden.my.orig->write, "ppii", context->hidden.my.orig, ptr, size, num);
}
EXPORT int32_t my2_emulated_close(SDL2_RWops_t *context)
{
int ret = (int32_t)RunFunctionFmt((uintptr_t)context->hidden.my.orig->close, "p", context->hidden.my.orig);
context->hidden.my.custom_free(context);
return ret;
}
static uintptr_t emulated_sdl2allocrw = 0;
EXPORT SDL2_RWops_t* my_wrapped_sdl2allocrw()
{
return (SDL2_RWops_t*)RunFunctionFmt(emulated_sdl2allocrw, "");
}
static uintptr_t emulated_sdl2freerw = 0;
EXPORT void my_wrapped_sdl2freerw(SDL2_RWops_t* p)
{
RunFunctionFmt(emulated_sdl2freerw, "p", p);
}
static void checkSDL2isNative()
{
if(my_context->sdl2allocrw)
return;
emulated_sdl2allocrw = FindGlobalSymbol(my_context->maplib, "SDL_AllocRW", -1, NULL);
emulated_sdl2freerw = FindGlobalSymbol(my_context->maplib, "SDL_FreeRW", -1, NULL);
if(emulated_sdl2allocrw && emulated_sdl2freerw) {
my_context->sdl2allocrw = my_wrapped_sdl2allocrw;
my_context->sdl2freerw = my_wrapped_sdl2freerw;
} else
printf_log(LOG_NONE, "Warning, cannot find SDL_AllocRW and/or SDL_FreeRW function in loaded libs");
}
SDL2_RWops_t* AddNativeRW2(x64emu_t* emu, SDL2_RWops_t* ops)
{
if(!ops)
return NULL;
checkSDL2isNative();
uintptr_t fnc;
bridge_t* system = emu->context->system;
sdl2_allocrw Alloc = (sdl2_allocrw)emu->context->sdl2allocrw;
sdl2_freerw Free = (sdl2_freerw)emu->context->sdl2freerw;
SDL2_RWops_t* newrw = Alloc();
newrw->type = BOX64RW;
newrw->hidden.my.orig = ops;
newrw->hidden.my.custom_free = Free;
// get or create wrapper, add it to map and change to the emulated one if rw
#define GO(A, W) \
fnc = AddCheckBridge(system, W, my2_native_##A, 0, NULL); \
newrw->A = (sdl2_##A)fnc;
SUPER()
#undef GO
return newrw;
}
// put Native RW function, wrapping emulated (callback style) ones if needed
SDL2_RWops_t* RWNativeStart2(x64emu_t* emu, SDL2_RWops_t* ops)
{
if(!ops)
return NULL;
if(ops->type == BOX64RW)
return ops->hidden.my.orig;
checkSDL2isNative();
sdl2_allocrw Alloc = (sdl2_allocrw)emu->context->sdl2allocrw;
SDL2_RWops_t* newrw = Alloc();
newrw->type = BOX64RW;
newrw->hidden.my.orig = ops;
newrw->hidden.my.custom_free = (sdl2_freerw)emu->context->sdl2freerw;
// create wrapper
#define GO(A, W) \
newrw->A = my2_emulated_##A;
SUPER()
#undef GO
return newrw;
}
void RWNativeEnd2(SDL2_RWops_t* ops)
{
if(!ops || ops->type != BOX64RW)
return; // do nothing
ops->hidden.my.custom_free(ops);
}
int isRWops(SDL2_RWops_t* ops)
{
if(!ops)
return 0;
#define GO(A, W) \
if(!ops->A || (uintptr_t)ops->A < 0x1000) return 0;
SUPER()
#undef GO
// check if all then hidden content is just full of 0
if(ops->hidden.mem.base==NULL && ops->hidden.mem.here==NULL && ops->hidden.mem.stop==NULL)
return 0;
// check the type (not sure it's a good check here)
if (ops->type>5 && ops->type!=BOX64RW)
return 0;
return 1;
}
int64_t RWNativeSeek2(SDL2_RWops_t *ops, int64_t offset, int32_t whence)
{
return ops->seek(ops, offset, whence);
}
uint32_t RWNativeRead2(SDL2_RWops_t* ops, void* ptr, uint32_t size, uint32_t maxnum)
{
return ops->read(ops, ptr, size, maxnum);
}
int32_t RWNativeWrite2(SDL2_RWops_t *ops, const void *ptr, int32_t size, int32_t num)
{
return ops->write(ops, ptr, size, num);
}
int32_t RWNativeClose2(SDL2_RWops_t* ops)
{
return ops->close(ops);
}
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