user: Demonstrate the C code that generates the assembly output below:

```asm
<i2c_ASN1_INTEGER>:
  endbr64
  push   %r12
  push   %rbx
  sub    $0x8,%rsp
  test   %rdi,%rdi
  je     L270
  mov    D5(%rip),%rdx
  mov    %rdi,%rax
  mov    (%rdi),%ecx
  mov    %rsi,%rbx
  mov    (%rdx),%edi
  mov    0x4(%rax),%edx
  test   %edx,%edx
  jne    L90
  test   %rsi,%rsi
  je     L30
  mov    (%rsi),%rdi
  mov    $0x1,%r8d
  mov    $0x1,%r12d
L263:
  movb   $0x0,(%rdi)
L52:
  add    %r8,(%rbx)
L184:
  add    $0x8,%rsp
  mov    %r12d,%eax
  pop    %rbx
  pop    %r12
  ret
  nopl   (%rax)
L90:
  mov    0x8(%rax),%rsi
  mov    (%rsi),%r8d
  cmp    $0x1,%edx
  jne    L189
  test   %r8d,%r8d
  jne    L189
  mov    $0x1,%r12d
  test   %rbx,%rbx
  je     L184
  mov    (%rbx),%rdi
  mov    $0x1,%edx
L210:
  call   <memcpy@plt>
  movslq %r12d,%r8
  jmp    L52
  cs nopw 0x0(%rax,%rax,1)
L189:
  and    %edi,%ecx
  jne    L203
  cmp    $0x7f,%r8d
  jle    L92
  lea    0x1(%rdx),%r12d
  test   %rbx,%rbx
  je     L184
  mov    (%rbx),%rdx
  movb   $0x0,(%rdx)
  lea    0x1(%rdx),%rdi
  mov    0x4(%rax),%edx
  test   %edx,%edx
  jne    L274
L194:
  movslq %r12d,%r8
  jmp    L263
  nopl   (%rax)
L92:
  test   %ecx,%ecx
  je     L199
L203:
  cmp    $0x80,%r8d
  jg     L40
  je     L361
  test   %rbx,%rbx
  je     L118
  mov    (%rbx),%rdi
  mov    %edx,%r12d
  jmp    L181
  nopl   0x0(%rax)
L270:
  xor    %r12d,%r12d
  add    $0x8,%rsp
  mov    %r12d,%eax
  pop    %rbx
  pop    %r12
  ret
L361:
  cmp    $0x1,%edx
  jle    L235
  lea    -0x2(%rdx),%edi
  lea    0x4(%rsi),%rcx
  lea    0x8(%rsi,%rdi,4),%rdi
  jmp    L328
  nopl   (%rax)
L383:
  add    $0x4,%rcx
  cmp    %rcx,%rdi
  je     L235
L328:
  mov    (%rcx),%r8d
  test   %r8d,%r8d
  je     L383
  nopl   (%rax)
L40:
  lea    0x1(%rdx),%r12d
  test   %rbx,%rbx
  je     L184
  mov    (%rbx),%rdx
  movb   $0xff,(%rdx)
  lea    0x1(%rdx),%rdi
  mov    0x4(%rax),%edx
  test   %edx,%edx
  je     L194
  mov    0x8(%rax),%rsi
L181:
  movslq %edx,%rax
  lea    -0x4(%rsi,%rax,4),%rsi
  lea    -0x1(%rdi,%rax,1),%rcx
  movzbl (%rsi),%eax
  test   %al,%al
  jne    L315
  cmp    $0x1,%edx
  jg     L268
  jmp    L333
  nopl   0x0(%rax)
L45:
  cmp    $0x1,%edx
  je     L333
L268:
  sub    $0x1,%rsi
  movb   $0x0,(%rcx)
  sub    $0x1,%rcx
  sub    $0x1,%edx
  movzbl (%rsi),%eax
  test   %al,%al
  je     L45
L315:
  neg    %eax
  movslq %r12d,%r8
  mov    %al,(%rcx)
  cmp    $0x1,%edx
  jle    L52
  lea    -0x2(%rdx),%eax
  mov    $0xfffffffffffffffe,%rdi
  sub    %rax,%rdi
  mov    $0xffffffffffffffff,%rax
  nopw   0x0(%rax,%rax,1)
L117:
  movzbl (%rsi,%rax,1),%edx
  not    %edx
  mov    %dl,(%rcx,%rax,1)
  sub    $0x1,%rax
  cmp    %rax,%rdi
  jne    L117
  jmp    L52
  nop
L30:
  mov    $0x1,%r12d
  jmp    L184
  nopl   0x0(%rax,%rax,1)
L274:
  mov    0x8(%rax),%rsi
  jmp    L210
  nopl   0x0(%rax)
L199:
  test   %rbx,%rbx
  je     L118
  mov    (%rbx),%rdi
  mov    %edx,%r12d
  jmp    L210
L333:
  movb   $0x0,(%rcx)
  movslq %r12d,%r8
  jmp    L52
L118:
  mov    %edx,%r12d
  jmp    L184
L235:
  mov    %edx,%r12d
  test   %rbx,%rbx
  je     L184
  mov    (%rbx),%rdi
  jmp    L181
```

assistant: ```c
int i2c_ASN1_INTEGER(ASN1_INTEGER *a, unsigned char **pp) {
  int pad = 0, ret, i, neg;
  unsigned char *p, *n, pb = 0;
  if (a == NULL)
    return (0);
  neg = a->type & V_ASN1_NEG;
  if (a->length == 0)
    ret = 1;
  else {
    ret = a->length;
    i = a->data[0];
    if (ret == 1 && i == 0)
      neg = 0;
    if (!neg && (i > 127)) {
      pad = 1;
      pb = 0;
    } else if (neg) {
      if (i > 128) {
        pad = 1;
        pb = 0xFF;
      } else if (i == 128) {
        for (i = 1; i < a->length; i++)
          if (a->data[i]) {
            pad = 1;
            pb = 0xFF;
            break;
          }
      }
    }
    ret += pad;
  }
  if (pp == NULL)
    return (ret);
  p = *pp;
  if (pad)
    *(p++) = pb;
  if (a->length == 0)
    *(p++) = 0;
  else if (!neg)
    memcpy(p, a->data, (unsigned int)a->length);
  else {
    n = a->data + a->length - 1;
    p += a->length - 1;
    i = a->length;
    while (!*n && i > 1) {
      *(p--) = 0;
      n--;
      i--;
    }
    *(p--) = ((*(n--)) ^ 0xff) + 1;
    i--;
    for (; i > 0; i--)
      *(p--) = *(n--) ^ 0xff;
  }
  *pp += ret;
  return (ret);
}
```