Random line of code thread

category: code [glöplog]

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Code:

@panic
	; oh god oh fuck
	ld	hl,DS_TempSP
	ld	a,[hl]
	inc	l
	ld	h,[hl]
	ld	l,a
	ld	sp,hl
	jp	DevSound_StopMusic

actually 9 lines but whatever

added on the 2021-04-21 00:28:34 by DevEd

One-liner which plays DRM protected content from Audible using ffplay, ffprobe & rainbowcrack:

Code:

ffplay -activation_bytes $(./rcrack . -h $(ffprobe $1 2>&1 | grep 'file checksum == ' | awk -F ' == ' '{print $2}') | grep 'hex:' | awk -F ':' '{print $2}') $1

added on the 2021-04-21 23:47:42 by pintcat

Oh and it's inAudible-NG's build of rainbowcrack I was referring to. It contains pre-generated rainbow tables to retrieve your Audible activation code.

added on the 2021-04-22 00:42:06 by pintcat

LODA assembly language where bitwise xor/and/or is tricky, but gcd is a builtin instruction. Here is the factorial function.

Code:

; A000142: Factorial numbers: n! = 1*2*3*4*...*n.
; 1,1,2,6,24,120,720,5040,40320,362880,3628800

mov $1,1
lpb $0
  mul $1,$0
  sub $0,1
lpe

added on the 2021-04-22 13:18:48 by neoneye

Code:lea $180+PatchCodeSize_NTSC(a0),a2

added on the 2021-05-11 09:52:16 by StingRay

Code:

#include <Windows.h>

#include <set>

int __stdcall WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd) {
    std::set<int> rates;

    DEVMODE mode, current;
    EnumDisplaySettings(NULL, ENUM_CURRENT_SETTINGS, &current);
    int i = 0;
    while (EnumDisplaySettings(NULL, i++, &mode)) {
        if (mode.dmPelsWidth == current.dmPelsWidth && mode.dmPelsHeight == current.dmPelsHeight && mode.dmBitsPerPel == current.dmBitsPerPel) {
            rates.insert(mode.dmDisplayFrequency);
        }
    }

    char key = '1';
    for (int rate : rates) {
        RegisterHotKey(NULL, rate, MOD_CONTROL | MOD_ALT | MOD_WIN, key++);
    }

    MSG msg;
    while (GetMessage(&msg, NULL, 0, 0) > 0) {
        if (msg.message == WM_HOTKEY) {
            int rate = static_cast<int>(msg.wParam);
            if (rates.count(rate)) {
                EnumDisplaySettings(NULL, ENUM_CURRENT_SETTINGS, &current);
                current.dmDisplayFrequency = rate;
                ChangeDisplaySettings(&current, CDS_UPDATEREGISTRY);
            }
        }
    }

    return 0;
}

added on the 2021-05-13 12:35:17 by Blueberry

Code:

//https://stackoverflow.com/questions/277772/avoid-trailing-zeroes-in-printf
//adapted from paxdiablo (removed truncating)
char StringForDouble[50];
char *PointerInString;
void PrintDouble(double number) {
  sprintf(StringForDouble,"%.10f",number); // convert number to string
  PointerInString=strchr(&StringForDouble[0],'.'); // find decimal point, if any
  if(PointerInString!=NULL) {
    PointerInString=strchr(&PointerInString[0],'\0'); // find end of string
    PointerInString--;
    while(PointerInString[0]=='0') {  // remove trailing zeros
      PointerInString[0]='\0';
      PointerInString--;
    }
    if (PointerInString[0]=='.') { PointerInString[0]='\0'; } // if all decimals were zeros, remove "."
  }
  fprintf(filep,"%s",&StringForDouble[0]);
}

added on the 2021-05-26 19:42:33 by baah

Code:int pos=(int(sin(y/80.0-n*10)*100+sin(-y/50.0+n-frameCount/23.0)*100+200)+frameCount*8)%256;

added on the 2021-05-27 07:21:07 by Marq

When looking back at it this morning. Is it any better?

Code:

//https://stackoverflow.com/questions/277772/avoid-trailing-zeroes-in-printf
//adapted from paxdiablo (removed truncating)
char StringForDouble[50];
char *PointerInString;
void PrintDouble (double number) {
  sprintf(StringForDouble,"%.10f",number); // convert number to string
  PointerInString=strchr(&StringForDouble[0],'.'); // find decimal point, if any
  if(PointerInString!=NULL) {
    PointerInString=strchr(&PointerInString[0],'\0'); // find end of string
    do{
      PointerInString--;
    } while(PointerInString[0]=='0'); // remove trailing zeros
    if (PointerInString[0]=='.') { // if all decimals were zeros, remove "."
      PointerInString[0]='\0';
    } else {
      PointerInString[1]='\0'; //otherwise put EOS after the first non zero char
    }
  }
  printf("%s",&StringForDouble[0]);
}

added on the 2021-05-27 09:43:01 by baah

col -= foo(vec2(s*0.000000000000000000000674022 * uv.yx));

added on the 2021-05-27 19:50:50 by BSC

Code:

char I[1<<28];size_t K=0,H;long J,_,E;double O,L;
size_t R(){return I[K++];}
long ri(){for(L=_=1,J=0;H=R()-43,H<3&&(_=1-H)||H-5<10&&(J=J*10+H-5,1);L*=10);return J;}
double rf(){O=ri();E=_;H<4?O+=ri()/L:0;return(H-26<33?pow(10,ri()*_):1)*O*E;}
int main() {
    fread(I,1,sizeof I,stdin);
    // use ri()*_ to read longs or rf() to read doubles
}

added on the 2021-05-28 00:30:46 by byteobserver

Code:cmp.w C64TimerAValue(a6),d0

added on the 2021-05-29 12:24:16 by StingRay

U-boot time!

Code:

# Now it's time for some trickery: are we running on a Zybo or a Zybo-Z7?
#
# The Z7 has 1 GiB of RAM, compared to 512 MiB on the old Zybo. I.e. the latter only
# has 0x2000_0000 DRAM bytes, while the Zynq SoC maps the entire
# 0x0000_0000..0x3fff_ffff address range to DRAM. Thus, the old Zybo simply
# mirrors 0x2000_0000..0x3fff_ffff to 0x0000_0000..0x1fff_ffff .
#
# Why is this interesting to us? Well, we can write one pattern to 0x2400_0000,
# another to 0x0400_0000, and see if 0x2400_0000 suddenly contains the second
# pattern written to the low address. If so, we are running an old Zybo.

# Fill memory areas
mw ${testaddr_lma_hi} 0x69420 8
mw ${testaddr_lma} 0x1337 8

if cmp ${testaddr_lma} ${testaddr_lma_hi} 8; then
	echo "Running on Zybo 1st ed"
	# [snip] (load zybo dtb)
else
	echo "Running on Zybo-Z7"
	# [snip] (load zybo-z7 dtb)
fi

added on the 2021-07-06 14:03:08 by porocyon

Quote:

move.l #($4eae<<16)|(-636&$ffff),d0

added on the 2021-07-14 12:10:55 by StingRay

Code:armi.a1=atan2((-l2*sin(armi.a2)*x+(l1+l2*cos(armi.a2))*y),(l2*sin(armi.a2)*y+(l1+l2*cos(armi.a2))*x));

added on the 2021-07-14 13:16:21 by Marq

today i implemented a switch in a switch... you don't do that very often, so i felt very xzibit

added on the 2021-07-14 13:16:25 by el mal

Code:two_pints = 2 * math.pi * n * t

added on the 2021-07-14 13:59:42 by jobe

Quote:

Code:two_pints = 2 * math.pi * n * t

added on the 2021-07-14 14:16:11 by ferris

taunting us with that one

added on the 2021-07-14 14:16:34 by ferris

Code:cmp.b #(($c00000-$80000)>>16),d1

added on the 2021-09-16 22:18:34 by StingRay

Code:

static sF32 loc_sum_partials(const sF32 *_tbl, sU16 *_phases, const sU16 *_speeds, const sF32 *_amps) {
   sF32 r = 0.0f;
   for(sUI i = 0u; i < 256u/*sample->num_partials*/; i++)
   {
      r += _tbl[_phases[i]] * _amps[i];
      _phases[i] += _speeds[i];
   }
   return r;
}

(you need an FFT for this. sounds *lush*)

added on the 2021-10-05 19:09:52 by bsp

Code:// TODO: urgent, must fix before 1st release!

added on the 2021-10-05 19:51:39 by neoneye

How many years after the first release was the line unearthed?

added on the 2021-10-05 19:52:50 by Saga Musix

It's fiction. I can't recall if I have seen it or not.

added on the 2021-10-05 19:56:12 by neoneye

Code:

    ld      hl,DFP_UpdateFlags
    push    bc
    ld      a,0
    inc     c
    scf
:   rla
    and     a
    dec     c
    jr      nz,:-
    or      [hl]
    ld      [hl],a
    pop     bc

added on the 2021-11-15 18:49:42 by DevEd

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