user: 请从给定的汇编指令推导出C源代码：

```asm
<decode_block6>:
  endbr64
  test   %esi,%esi
  je     L245
  lea    -0x2(%rsi),%eax
  push   %rbp
  movdqa D3(%rip),%xmm3
  mov    %rdx,%rcx
  push   %rbx
  lea    0x2(%rdi,%rax,1),%r9
  xor    %r8d,%r8d
  pxor   %xmm4,%xmm4
  jmp    L110
  nopw   0x0(%rax,%rax,1)
L242:
  mov    %eax,%edx
  add    $0x2,%rcx
  add    $0x2,%r8d
  shr    $0x8,%dx
  lea    0x0(,%rdx,4),%esi
  add    %edx,%edx
  and    $0xe0,%si
  and    $0xe,%edx
  or     %esi,%edx
  mov    %dl,-0x2(%rcx)
  lea    (%rax,%rax,1),%edx
  shl    $0x2,%eax
  and    $0xe,%edx
  and    $0xe0,%ax
  or     %edx,%eax
  mov    %al,-0x1(%rcx)
L52:
  cmp    %r9,%rdi
  je     L160
L110:
  movzbl (%rdi),%eax
  movzbl 0x1(%rdi),%edx
  add    $0x2,%rdi
  shl    $0x8,%eax
  add    %dx,%ax
  jns    L242
  mov    %eax,%esi
  mov    %rcx,%rdx
  shr    $0x5,%si
  and    $0x3ff,%esi
  mov    %rsi,%r11
  sub    %rsi,%rdx
  neg    %r11
  and    $0x1f,%ax
  je     L52
  lea    -0x1(%rax),%r10d
  cmp    $0xe,%r10w
  jbe    L140
  cmp    $0xffffffffffffffe0,%r11
  ja     L140
  movdqu (%rdx),%xmm0
  movdqu 0x10(%rdx),%xmm1
  movdqu (%rdx),%xmm2
  pand   %xmm3,%xmm1
  pand   %xmm3,%xmm0
  packuswb %xmm1,%xmm0
  movdqu 0x10(%rdx),%xmm1
  psrlw  $0x8,%xmm2
  psrlw  $0x8,%xmm1
  packuswb %xmm1,%xmm2
  movdqa %xmm0,%xmm1
  punpckhbw %xmm4,%xmm0
  movdqa %xmm2,%xmm5
  punpcklbw %xmm4,%xmm1
  punpckhbw %xmm4,%xmm2
  psllw  $0x8,%xmm1
  psllw  $0x8,%xmm0
  punpcklbw %xmm4,%xmm5
  paddw  %xmm5,%xmm1
  paddw  %xmm2,%xmm0
  movdqa %xmm0,%xmm5
  movdqa %xmm1,%xmm2
  pand   %xmm3,%xmm0
  psrlw  $0x8,%xmm2
  psrlw  $0x8,%xmm5
  pand   %xmm3,%xmm1
  pand   %xmm3,%xmm2
  pand   %xmm3,%xmm5
  packuswb %xmm0,%xmm1
  packuswb %xmm5,%xmm2
  movdqa %xmm2,%xmm0
  punpckhbw %xmm1,%xmm2
  punpcklbw %xmm1,%xmm0
  movups %xmm2,0x10(%rcx)
  movups %xmm0,(%rcx)
  cmp    $0x10,%ax
  je     L179
  movzbl 0x20(%rdx),%esi
  movzbl 0x21(%rdx),%r11d
  shl    $0x8,%esi
  add    %r11d,%esi
  rol    $0x8,%si
  mov    %si,0x20(%rcx)
  cmp    $0x11,%ax
  je     L171
  movzbl 0x22(%rdx),%esi
  movzbl 0x23(%rdx),%r11d
  shl    $0x8,%esi
  add    %r11d,%esi
  rol    $0x8,%si
  mov    %si,0x22(%rcx)
  cmp    $0x12,%ax
  je     L171
  movzbl 0x24(%rdx),%esi
  movzbl 0x25(%rdx),%r11d
  shl    $0x8,%esi
  add    %r11d,%esi
  rol    $0x8,%si
  mov    %si,0x24(%rcx)
  cmp    $0x13,%ax
  je     L171
  movzbl 0x26(%rdx),%esi
  movzbl 0x27(%rdx),%r11d
  shl    $0x8,%esi
  add    %r11d,%esi
  rol    $0x8,%si
  mov    %si,0x26(%rcx)
  cmp    $0x14,%ax
  je     L171
  movzbl 0x28(%rdx),%esi
  movzbl 0x29(%rdx),%r11d
  shl    $0x8,%esi
  add    %r11d,%esi
  rol    $0x8,%si
  mov    %si,0x28(%rcx)
  cmp    $0x15,%ax
  je     L171
  movzbl 0x2a(%rdx),%esi
  movzbl 0x2b(%rdx),%r11d
  shl    $0x8,%esi
  add    %r11d,%esi
  rol    $0x8,%si
  mov    %si,0x2a(%rcx)
  cmp    $0x16,%ax
  je     L171
  movzbl 0x2c(%rdx),%esi
  movzbl 0x2d(%rdx),%r11d
  shl    $0x8,%esi
  add    %r11d,%esi
  rol    $0x8,%si
  mov    %si,0x2c(%rcx)
  cmp    $0x17,%ax
  je     L171
  movzbl 0x2e(%rdx),%esi
  movzbl 0x2f(%rdx),%r11d
  shl    $0x8,%esi
  add    %r11d,%esi
  rol    $0x8,%si
  mov    %si,0x2e(%rcx)
  cmp    $0x18,%ax
  je     L171
  movzbl 0x30(%rdx),%esi
  movzbl 0x31(%rdx),%r11d
  shl    $0x8,%esi
  add    %r11d,%esi
  rol    $0x8,%si
  mov    %si,0x30(%rcx)
  cmp    $0x19,%ax
  je     L171
  movzbl 0x32(%rdx),%esi
  movzbl 0x33(%rdx),%r11d
  shl    $0x8,%esi
  add    %r11d,%esi
  rol    $0x8,%si
  mov    %si,0x32(%rcx)
  cmp    $0x1a,%ax
  je     L171
  movzbl 0x34(%rdx),%esi
  movzbl 0x35(%rdx),%r11d
  shl    $0x8,%esi
  add    %r11d,%esi
  rol    $0x8,%si
  mov    %si,0x34(%rcx)
  cmp    $0x1b,%ax
  je     L171
  movzbl 0x36(%rdx),%esi
  movzbl 0x37(%rdx),%r11d
  shl    $0x8,%esi
  add    %r11d,%esi
  rol    $0x8,%si
  mov    %si,0x36(%rcx)
  cmp    $0x1c,%ax
  je     L171
  movzbl 0x38(%rdx),%esi
  movzbl 0x39(%rdx),%r11d
  shl    $0x8,%esi
  add    %r11d,%esi
  mov    %eax,%r11d
  rol    $0x8,%si
  mov    %si,0x38(%rcx)
  sub    $0x1d,%r11w
  je     L171
  movzbl 0x3a(%rdx),%esi
  movzbl 0x3b(%rdx),%ebx
  shl    $0x8,%esi
  add    %ebx,%esi
  rol    $0x8,%si
  mov    %si,0x3a(%rcx)
  cmp    $0x1,%r11w
  je     L171
  movzbl 0x3c(%rdx),%esi
  movzbl 0x3d(%rdx),%edx
  shl    $0x8,%esi
  add    %esi,%edx
  rol    $0x8,%dx
  mov    %dx,0x3c(%rcx)
  nopl   0x0(%rax)
L171:
  movzwl %ax,%eax
L134:
  movzwl %r10w,%r10d
  lea    (%rcx,%rax,2),%rcx
  lea    0x2(%r8,%r10,2),%r8d
  cmp    %r9,%rdi
  jne    L110
L160:
  mov    %r8d,%eax
  pop    %rbx
  pop    %rbp
  ret
  nop
L140:
  movzwl %ax,%eax
  mov    %rcx,%rsi
  lea    (%rdx,%rax,2),%rbp
  nopw   0x0(%rax,%rax,1)
L6:
  movzbl (%rdx),%ebx
  movzbl 0x1(%rdx),%r11d
  add    $0x2,%rdx
  add    $0x2,%rsi
  mov    %bl,-0x2(%rsi)
  mov    %r11b,-0x1(%rsi)
  cmp    %rbp,%rdx
  jne    L6
  jmp    L134
L179:
  mov    $0x10,%eax
  jmp    L134
L245:
  xor    %eax,%eax
  ret
```

tool_calls: name: retrieve_data
arguments: data_label: D3
data_type: byte[16]

tool: {"D3": [0xff,0x00,0xff,0x00,0xff,0x00,0xff,0x00,0xff,0x00,0xff,0x00,0xff,0x00,0xff,0x00]}

assistant: ```c
int decode_block6(unsigned char *in, int length, unsigned char *out) {
  unsigned short t0, t1, t3;
  int len = 0;
  while (length != 0) {
    t0 = (((in)[0] << 8) + ((in)[1]));
    in += 2;
    if ((0x8000 & t0) == 0) {
      unsigned short t2;
      t1 = t0 >> 8;
      t2 = t1 & 0x38;
      t1 = t1 & 0x07;
      t2 <<= 2;
      t1 <<= 1;
      t1 |= t2;
      *out = t1;
      t1 = t0 & 0xFF;
      t2 = t1 & 0x38;
      t1 = t1 & 0x07;
      t2 <<= 2;
      t1 <<= 1;
      t1 |= t2;
      *(out + 1) = t1;
      out += 2;
      length -= 2;
      len += 2;
    } else {
      unsigned char *t2;
      t1 = t0 & 0x1F;
      t0 = t0 & 0x7FFF;
      t0 >>= 5;
      length -= 2;
      t2 = out - t0;
      while (t1 != 0) {
        t3 = (((t2)[0] << 8) + ((t2)[1]));
        t2 += 2;
        t1 -= 1;
        do {
          (out)[0] = ((t3) >> 8) & 0xFF;
          (out)[1] = ((t3)) & 0xFF;
        } while (0);
        out += 2;
        len += 2;
      }
    }
  }
  return len;
}
```