Help with Byte writing system

[IchigoKurosaki]

I need some help with this... It currently didn't work... it's mostly based off the WAB Multi-loader :icon_wink

#include <pspkernel.h>
#include <pspdebug.h>
#include <pspdisplay.h>
#include <pspctrl.h>
#include <pspiofilemgr.h>
#include <pspgu.h>
#include <stdlib.h>
#include <string.h>

#define MAX(X, Y) ((X) > (Y) ? (X) : (Y))

PSP_MODULE_INFO("FlashMod", 0, 1, 1);

int exist = 0;
char write_buffer[128*1024];

int exit_callback(int arg1, int arg2, void *common);

int CallbackThread(SceSize args, void *argp); 

int SetupCallbacks(void);

void check(const char* zFile);

int main() {
	int source, target;
	int lFileLength;
	char *szBuffer;
	char szString1[] = { 0x10 };

	SetupCallbacks();

 	source = sceIoOpen("ms0:/test.prx",PSP_O_RDONLY , 0);
	sceIoLseek(source, 10, PSP_SEEK_SET);
	lFileLength = sceIoLseek(source, 0, PSP_SEEK_END);
	sceIoLseek(source, 10, PSP_SEEK_SET);
	szBuffer = (char *)malloc(lFileLength);
	target = sceIoOpen("ms0:/test.prx",PSP_O_WRONLY | PSP_O_CREAT | PSP_O_TRUNC, 0777);
	memcpy(szBuffer, szString1, 1);

	sceIoWrite(target, szBuffer ,lFileLength);
	sceIoClose(target);
	sceIoClose(source);
		
	sceKernelExitGame();
	return 0;
}

int exit_callback(int arg1, int arg2, void *common) {
	sceKernelExitGame();
	return 0;
}

int CallbackThread(SceSize args, void *argp) {
	int cbid;
	cbid = sceKernelCreateCallback("Exit Callback", exit_callback, NULL);
	sceKernelRegisterExitCallback(cbid);
	sceKernelSleepThreadCB();
	return 0;
}

int SetupCallbacks(void) {
	int thid = 0;
	thid = sceKernelCreateThread("update_thread", CallbackThread, 0x11, 0xFA0, 0, 0);
	if(thid >= 0)
	{
		sceKernelStartThread(thid, 0, 0);
	}
	return thid;
}

void check(const char* zFile){
	int fd3;
	fd3 = sceIoOpen(zFile, PSP_O_RDONLY, 0);
	if(fd3 < 0) {
		exist = 0;
	   }
	else {
			 exist = 1;
	   }
	sceIoClose(fd3);
}

[Flamingwolf]

EDIT: NVM, i got it

[IchigoKurosaki]

Got it working

#include <pspkernel.h>
#include <pspdebug.h>
#include <pspdisplay.h>
#include <pspctrl.h>
#include <pspiofilemgr.h>
#include <pspgu.h>
#include <stdlib.h>
#include <string.h>

#define MAX(X, Y) ((X) > (Y) ? (X) : (Y))

PSP_MODULE_INFO("FlashMod", 0, 1, 1);

int exist = 0;
char write_buffer[128*1024];

int exit_callback(int arg1, int arg2, void *common);

int CallbackThread(SceSize args, void *argp); 

int SetupCallbacks(void);

void check(const char* zFile);

int main() {
	int source, target;
	int lFileLength;
	char *szBuffer;
	char szString1[] = { 0x10 };

	SetupCallbacks();

 	source = sceIoOpen("ms0:/test.prx",PSP_O_RDONLY , 0);
	sceIoLseek(source, 0, PSP_SEEK_END);
	lFileLength = sceIoLseek(source, 0, PSP_SEEK_END);
	sceIoLseek(source, 0, PSP_SEEK_SET);
	szBuffer = (char *)malloc(lFileLength);
	target = sceIoOpen("ms0:/test2.prx",PSP_O_WRONLY | PSP_O_CREAT | PSP_O_TRUNC, 0777);

	memcpy(&szBuffer[10], szString1, 1);


	sceIoWrite(target, szBuffer ,lFileLength);
	sceIoClose(target);
	sceIoClose(source);
	
	sceIoRemove("ms0:/test.prx");
	sceIoRename("ms0:/test2.prx", "ms0:/test.prx");
	sceKernelExitGame();
	return 0;
}

int exit_callback(int arg1, int arg2, void *common) {
	sceKernelExitGame();
	return 0;
}

int CallbackThread(SceSize args, void *argp) {
	int cbid;
	cbid = sceKernelCreateCallback("Exit Callback", exit_callback, NULL);
	sceKernelRegisterExitCallback(cbid);
	sceKernelSleepThreadCB();
	return 0;
}

int SetupCallbacks(void) {
	int thid = 0;
	thid = sceKernelCreateThread("update_thread", CallbackThread, 0x11, 0xFA0, 0, 0);
	if(thid >= 0)
	{
		sceKernelStartThread(thid, 0, 0);
	}
	return thid;
}

void check(const char* zFile){
	int fd3;
	fd3 = sceIoOpen(zFile, PSP_O_RDONLY, 0);
	if(fd3 < 0) {
		exist = 0;
	   }
	else {
			 exist = 1;
	   }
	sceIoClose(fd3);
}

THIS CODE WILL BRICK YOUR PSP IF USED ON FLASH....