user: 下面的汇编指令对应的C源代码是什么：

```asm
<main>:
  endbr64
  push   %r15
  mov    $0x20000,%edx
  lea    D21(%rip),%rsi
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0xb8,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,0xa8(%rsp)
  xor    %eax,%eax
  mov    D67(%rip),%rax
  mov    (%rax),%edi
  call   <read@plt>
  xor    %edi,%edi
  cmp    $0x4000,%rax
  mov    %rax,%r15
  setbe  %dil
  call   <assert@plt>
  test   %r15,%r15
  je     L44
L49:
  lea    D21(%rip),%rdx
  lea    -0x1(%r15),%rax
  cmpq   $0x0,-0x8(%rdx,%r15,8)
  jne    L44
  mov    %rax,%r15
  test   %r15,%r15
  jne    L49
L44:
  xor    %r14d,%r14d
  xor    %r10d,%r10d
  xor    %r8d,%r8d
  mov    %r15,(%rsp)
  lea    0x38(%rsp),%rdi
  mov    %r14,%r9
  mov    $0xffffffff,%r12d
  xor    %edx,%edx
  mov    %rdi,0x18(%rsp)
  mov    $0xffffffff,%eax
  xor    %r13d,%r13d
  mov    %r10,%r15
  mov    %r8d,%r14d
  jmp    L93
  nopl   0x0(%rax,%rax,1)
L43:
  lea    D21(%rip),%rcx
  mov    (%rcx,%r9,8),%rbx
  lea    0x1(%r14),%r9d
  mov    %r9,%r14
  mov    %ebx,%r11d
L1:
  mov    %r12d,%esi
  lea    0x2(%rdx),%ebp
  lea    0x0(,%r13,4),%ecx
  cmp    %rbx,%rax
  je     L85
  cmp    %rsi,%rbx
  jne    L165
L177:
  or     $0x3,%ecx
  mov    %ecx,%r13d
L9:
  cmp    $0x7,%ebp
  ja     L4
L92:
  mov    %r12d,%eax
  mov    %ebp,%edx
  mov    %r11d,%r12d
L93:
  cmp    (%rsp),%r9
  jne    L43
  test   %edx,%edx
  je     L124
  xor    %r11d,%r11d
  xor    %ebx,%ebx
  jmp    L1
  nopl   0x0(%rax)
L85:
  mov    %ecx,%r13d
  or     $0x2,%r13d
  cmp    %rsi,%rbx
  je     L177
  cmp    $0x7,%ebp
  jbe    L92
L4:
  sub    $0x8,%ebp
  mov    %r13d,%eax
  xor    %edi,%edi
  mov    %r9,0x10(%rsp)
  mov    %ebp,%ecx
  mov    %r11d,0x8(%rsp)
  shr    %cl,%eax
  cmp    $0x1,%rax
  mov    %rax,0x38(%rsp)
  setne  %dil
  call   <assert@plt>
  mov    0x18(%rsp),%rsi
  mov    $0x1,%edx
  mov    D56(%rip),%rax
  mov    (%rax),%edi
  call   <write_all@plt>
  mov    D56(%rip),%rax
  mov    %r15d,%edx
  lea    0x60(%rsp),%rsi
  xor    %r15d,%r15d
  mov    (%rax),%edi
  call   <write_all@plt>
  mov    $0x1,%eax
  mov    %ebp,%ecx
  mov    0x8(%rsp),%r11d
  shl    %cl,%eax
  mov    0x10(%rsp),%r9
  sub    $0x1,%eax
  and    %eax,%r13d
  jmp    L92
  nopl   0x0(%rax,%rax,1)
L165:
  lea    0x40(%rsp),%rsi
  mov    %r12d,%edi
  mov    %r9,0x28(%rsp)
  mov    %edx,0x24(%rsp)
  mov    %ecx,0x20(%rsp)
  mov    %r11d,0x10(%rsp)
  mov    %rsi,0x8(%rsp)
  call   <opts@plt>
  mov    0x24(%rsp),%edx
  mov    0x10(%rsp),%r11d
  xor    %eax,%eax
  mov    0x20(%rsp),%ecx
  mov    0x28(%rsp),%r9
  mov    0x8(%rsp),%rsi
L132:
  cmp    %rbx,(%rsi,%rax,8)
  je     L40
  add    $0x1,%rax
  cmp    $0x4,%rax
  jne    L132
  mov    %rbx,0x60(%rsp,%r15,8)
  mov    %ecx,%r13d
  add    $0x1,%r15
  jmp    L9
  xchg   %ax,%ax
L124:
  mov    D56(%rip),%rax
  mov    0x18(%rsp),%rsi
  mov    $0x1,%edx
  movq   $0x1,0x38(%rsp)
  mov    (%rax),%edi
  call   <write_all@plt>
  mov    0xa8(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L63
  add    $0xb8,%rsp
  xor    %eax,%eax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopl   0x0(%rax,%rax,1)
L40:
  shl    $0x4,%r13d
  lea    0x4(%rdx),%ebp
  or     %eax,%r13d
  or     $0x4,%r13d
  jmp    L9
L63:
  call   <__stack_chk_fail@plt>
```

assistant: ```c
int main() {
  static uint8_t source[0x4000];
  size_t size = read(STDIN_FILENO, &source, sizeof(source));
  unsigned pos = 0;
  assert(size <= 0x4000);
  while (size && source[size - 1] == 0) {
    size--;
  }
  uint8_t literals[8];
  size_t literals_size = 0;
  unsigned bits = 0;
  unsigned control = 0;
  unsigned prev[2] = {-1, -1};
  while (true) {
    uint8_t byte = 0;
    if (pos == size) {
      if (bits == 0)
        break;
    } else {
      byte = source[pos++];
    }
    if (byte == prev[0] || byte == prev[1]) {
      bits += 2;
      control <<= 1;
      control |= 1;
      control <<= 1;
      if (byte == prev[1]) {
        control |= 1;
      }
    } else {
      bits += 2;
      control <<= 2;
      uint8_t options[4];
      opts(prev[1], options);
      bool found = false;
      for (unsigned i = 0; i < 4; i++) {
        if (options[i] == byte) {
          control |= 1;
          bits += 2;
          control <<= 2;
          control |= i;
          found = true;
          break;
        }
      }
      if (!found) {
        literals[literals_size++] = byte;
      }
    }
    prev[0] = prev[1];
    prev[1] = byte;
    if (bits >= 8) {
      uint8_t outctl = control >> (bits - 8);
      assert(outctl != 1);
      write_all(STDOUT_FILENO, &outctl, 1);
      write_all(STDOUT_FILENO, literals, literals_size);
      bits -= 8;
      control &= (1 << bits) - 1;
      literals_size = 0;
    }
  }
  uint8_t end_byte = 1;
  write_all(STDOUT_FILENO, &end_byte, 1);
  return 0;
}
```