user: What would the C source look like for the assembly code provided here?

```asm
<validate_tcp_checksum>:
  endbr64
  mov    %ecx,%eax
  movzwl %si,%r8d
  movzwl %cx,%ecx
  shr    $0x10,%eax
  lea    0x6(%r8,%rax,1),%eax
  add    %ecx,%eax
  mov    %edx,%ecx
  movzwl %dx,%edx
  shr    $0x10,%ecx
  add    %ecx,%eax
  add    %edx,%eax
  test   $0x1,%sil
  je     L41
  lea    -0x1(%rsi),%edx
  mov    %rdx,%rsi
  movzbl (%rdi,%rdx,1),%edx
  shl    $0x8,%edx
  add    %edx,%eax
L41:
  test   %esi,%esi
  je     L157
  lea    -0x1(%rsi),%r8d
  cmp    $0x1d,%r8d
  jbe    L137
  shr    %r8d
  movdqa D5(%rip),%xmm5
  mov    %rdi,%rdx
  xor    %ecx,%ecx
  pxor   %xmm4,%xmm4
  pxor   %xmm3,%xmm3
  pxor   %xmm2,%xmm2
  add    $0x1,%r8d
  mov    %r8d,%r9d
  shr    $0x4,%r9d
  nopl   (%rax)
L191:
  movdqu (%rdx),%xmm0
  movdqu 0x10(%rdx),%xmm1
  add    $0x1,%ecx
  add    $0x20,%rdx
  movdqu -0x20(%rdx),%xmm6
  pand   %xmm5,%xmm1
  pand   %xmm5,%xmm0
  packuswb %xmm1,%xmm0
  movdqu -0x10(%rdx),%xmm1
  psrlw  $0x8,%xmm6
  psrlw  $0x8,%xmm1
  packuswb %xmm1,%xmm6
  movdqa %xmm0,%xmm1
  punpckhbw %xmm3,%xmm0
  movdqa %xmm6,%xmm7
  psllw  $0x8,%xmm0
  punpckhbw %xmm3,%xmm6
  por    %xmm6,%xmm0
  punpcklbw %xmm3,%xmm1
  punpcklbw %xmm3,%xmm7
  movdqa %xmm0,%xmm6
  psllw  $0x8,%xmm1
  punpckhwd %xmm2,%xmm0
  por    %xmm7,%xmm1
  punpcklwd %xmm2,%xmm6
  paddd  %xmm6,%xmm0
  movdqa %xmm1,%xmm6
  punpckhwd %xmm2,%xmm1
  punpcklwd %xmm2,%xmm6
  paddd  %xmm6,%xmm1
  paddd  %xmm1,%xmm0
  paddd  %xmm0,%xmm4
  cmp    %r9d,%ecx
  jb     L191
  movdqa %xmm4,%xmm0
  mov    %r8d,%ecx
  psrldq $0x8,%xmm0
  and    $0xfffffff0,%ecx
  paddd  %xmm0,%xmm4
  movdqa %xmm4,%xmm0
  psrldq $0x4,%xmm0
  paddd  %xmm0,%xmm4
  movd   %xmm4,%edx
  add    %edx,%eax
  lea    (%rcx,%rcx,1),%edx
  cmp    %ecx,%r8d
  je     L157
  mov    %edx,%ecx
  lea    0x1(%rdx),%r8d
  movzbl (%rdi,%rcx,1),%ecx
  movzbl (%rdi,%r8,1),%r8d
  shl    $0x8,%ecx
  or     %r8d,%ecx
  add    %ecx,%eax
  lea    0x2(%rdx),%ecx
  cmp    %ecx,%esi
  jbe    L157
  movzbl (%rdi,%rcx,1),%ecx
  lea    0x3(%rdx),%r8d
  movzbl (%rdi,%r8,1),%r8d
  shl    $0x8,%ecx
  or     %r8d,%ecx
  add    %ecx,%eax
  lea    0x4(%rdx),%ecx
  cmp    %ecx,%esi
  jbe    L157
  movzbl (%rdi,%rcx,1),%ecx
  lea    0x5(%rdx),%r8d
  movzbl (%rdi,%r8,1),%r8d
  shl    $0x8,%ecx
  or     %r8d,%ecx
  add    %ecx,%eax
  lea    0x6(%rdx),%ecx
  cmp    %ecx,%esi
  jbe    L157
  movzbl (%rdi,%rcx,1),%ecx
  lea    0x7(%rdx),%r8d
  movzbl (%rdi,%r8,1),%r8d
  shl    $0x8,%ecx
  or     %r8d,%ecx
  add    %ecx,%eax
  lea    0x8(%rdx),%ecx
  cmp    %ecx,%esi
  jbe    L157
  movzbl (%rdi,%rcx,1),%ecx
  lea    0x9(%rdx),%r8d
  movzbl (%rdi,%r8,1),%r8d
  shl    $0x8,%ecx
  or     %r8d,%ecx
  add    %ecx,%eax
  lea    0xa(%rdx),%ecx
  cmp    %ecx,%esi
  jbe    L157
  movzbl (%rdi,%rcx,1),%ecx
  lea    0xb(%rdx),%r8d
  movzbl (%rdi,%r8,1),%r8d
  shl    $0x8,%ecx
  or     %r8d,%ecx
  add    %ecx,%eax
  lea    0xc(%rdx),%ecx
  cmp    %ecx,%esi
  jbe    L157
  movzbl (%rdi,%rcx,1),%ecx
  lea    0xd(%rdx),%r8d
  movzbl (%rdi,%r8,1),%r8d
  shl    $0x8,%ecx
  or     %r8d,%ecx
  add    %ecx,%eax
  lea    0xe(%rdx),%ecx
  cmp    %ecx,%esi
  jbe    L157
  movzbl (%rdi,%rcx,1),%ecx
  lea    0xf(%rdx),%r8d
  movzbl (%rdi,%r8,1),%r8d
  shl    $0x8,%ecx
  or     %r8d,%ecx
  add    %ecx,%eax
  lea    0x10(%rdx),%ecx
  cmp    %ecx,%esi
  jbe    L157
  movzbl (%rdi,%rcx,1),%ecx
  lea    0x11(%rdx),%r8d
  movzbl (%rdi,%r8,1),%r8d
  shl    $0x8,%ecx
  or     %r8d,%ecx
  add    %ecx,%eax
  lea    0x12(%rdx),%ecx
  cmp    %ecx,%esi
  jbe    L157
  movzbl (%rdi,%rcx,1),%ecx
  lea    0x13(%rdx),%r8d
  movzbl (%rdi,%r8,1),%r8d
  shl    $0x8,%ecx
  or     %r8d,%ecx
  add    %ecx,%eax
  lea    0x14(%rdx),%ecx
  cmp    %ecx,%esi
  jbe    L157
  movzbl (%rdi,%rcx,1),%ecx
  lea    0x15(%rdx),%r8d
  movzbl (%rdi,%r8,1),%r8d
  shl    $0x8,%ecx
  or     %r8d,%ecx
  add    %ecx,%eax
  lea    0x16(%rdx),%ecx
  cmp    %ecx,%esi
  jbe    L157
  movzbl (%rdi,%rcx,1),%ecx
  lea    0x17(%rdx),%r8d
  movzbl (%rdi,%r8,1),%r8d
  shl    $0x8,%ecx
  or     %r8d,%ecx
  add    %ecx,%eax
  lea    0x18(%rdx),%ecx
  cmp    %ecx,%esi
  jbe    L157
  movzbl (%rdi,%rcx,1),%ecx
  lea    0x19(%rdx),%r8d
  movzbl (%rdi,%r8,1),%r8d
  shl    $0x8,%ecx
  or     %r8d,%ecx
  add    %ecx,%eax
  lea    0x1a(%rdx),%ecx
  cmp    %ecx,%esi
  jbe    L157
  movzbl (%rdi,%rcx,1),%ecx
  lea    0x1b(%rdx),%r8d
  movzbl (%rdi,%r8,1),%r8d
  shl    $0x8,%ecx
  or     %r8d,%ecx
  add    %ecx,%eax
  lea    0x1c(%rdx),%ecx
  cmp    %ecx,%esi
  jbe    L157
  movzbl (%rdi,%rcx,1),%ecx
  add    $0x1d,%edx
  movzbl (%rdi,%rdx,1),%edx
  shl    $0x8,%ecx
  or     %ecx,%edx
  add    %edx,%eax
  nopl   (%rax)
L157:
  test   $0xffff0000,%eax
  je     L35
  nopw   0x0(%rax,%rax,1)
L187:
  mov    %eax,%edx
  movzwl %ax,%eax
  shr    $0x10,%edx
  add    %edx,%eax
  test   $0x10000,%eax
  jne    L187
L35:
  cmp    $0xffff,%eax
  sete   %al
  movzbl %al,%eax
  ret
  nopl   (%rax)
L137:
  xor    %edx,%edx
  nopw   0x0(%rax,%rax,1)
L153:
  mov    %edx,%r8d
  lea    0x1(%rdx),%ecx
  add    $0x2,%edx
  movzbl (%rdi,%r8,1),%r8d
  movzbl (%rdi,%rcx,1),%ecx
  shl    $0x8,%r8d
  or     %r8d,%ecx
  add    %ecx,%eax
  cmp    %edx,%esi
  ja     L153
  jmp    L157
```

tool_calls: name: disassemble_data
arguments: tag: D5
data_type: byte[16]

tool: {"D5": [0xff,0x00,0xff,0x00,0xff,0x00,0xff,0x00,0xff,0x00,0xff,0x00,0xff,0x00,0xff,0x00]}

assistant: ```c
unsigned validate_tcp_checksum(const unsigned char *px, unsigned length, unsigned pseudo_ip_src, unsigned pseudo_ip_dst) {
  unsigned sum = 0;
  unsigned i;
  sum += (pseudo_ip_src >> 16) & 0xFFff;
  sum += (pseudo_ip_src >> 0) & 0xFFff;
  sum += (pseudo_ip_dst >> 16) & 0xFFff;
  sum += (pseudo_ip_dst >> 0) & 0xFFff;
  sum += 6;
  sum += length & 0xFFff;
  if (length & 1) {
    length--;
    sum += (px[length] << 8);
  }
  for (i = 0; i < length; i += 2)
    sum += (px[i] << 8) | px[i + 1];
  while (sum & 0xFFFF0000)
    sum = (sum >> 16) + (sum & 0xFFff);
  return sum == 0xFFFF;
}
```