user: 这段汇编代码用C语言表示是什么样的?

```asm
<process_buffer>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x1000,%rsp
  orq    $0x0,(%rsp)
  sub    $0x188,%rsp
  mov    %edx,0x1c(%rsp)
  mov    %fs:0x28,%rax
  mov    %rax,0x1178(%rsp)
  xor    %eax,%eax
  mov    %esi,%eax
  shr    $0x1f,%eax
  lea    (%rax,%rsi,1),%eax
  sar    %eax
  sub    $0x1164,%eax
  mov    %eax,0x18(%rsp)
  test   %eax,%eax
  jle    L219
  mov    %rdi,%r12
  mov    $0x0,%ebx
  movl   $0x0,0x4(%rsp)
  mov    $0x0,%ebp
  lea    0x28(%rsp),%rax
  mov    %rax,0x10(%rsp)
  jmp    L205
L106:
  lea    0x30(%rsp),%rsi
  mov    0x1c(%rsp),%ecx
  lea    (%rcx,%r14,1),%edi
  mov    %eax,%edx
  call   <handle_adsb_frame@plt>
  mov    0x8(%rsp),%ebx
  add    %r15d,%ebx
  jmp    L214
L176:
  test   %eax,%eax
  je     L214
  mov    0x2c(%rsp),%edx
  cmp    0x28(%rsp),%edx
  jle    L13
L214:
  add    $0x1,%ebx
  cmp    %ebx,0x18(%rsp)
  jle    L202
L205:
  lea    (%rbx,%rbx,1),%r14d
  movslq %r14d,%rax
  lea    0x4(%r12,%rax,4),%r13
  lea    0x0(,%rax,4),%r15
  mov    (%r12,%rax,4),%edi
  mov    0x0(%r13),%esi
  call   <phi_difference@plt>
  mov    %rax,0x8(%rsp)
  mov    0x8(%r12,%r15,1),%esi
  mov    0x0(%r13),%edi
  call   <phi_difference@plt>
  mov    %rax,%rdx
  add    %ebp,%ebp
  cmpq   $0x0,0x8(%rsp)
  setg   %al
  movzbl %al,%eax
  or     %eax,%ebp
  mov    0x4(%rsp),%eax
  add    %eax,%eax
  test   %rdx,%rdx
  setg   %dl
  movzbl %dl,%edx
  or     %eax,%edx
  mov    %edx,%r15d
  mov    %edx,0x4(%rsp)
  cmp    $0x23,%ebx
  jle    L214
  mov    $0xacdda4e2,%esi
  mov    %ebp,%edi
  call   <sync_word_fuzzy_compare@plt>
  test   %rax,%rax
  jne    L109
  mov    $0xacdda4e2,%esi
  mov    %r15d,%edi
  call   <sync_word_fuzzy_compare@plt>
  test   %rax,%rax
  je     L36
L109:
  lea    -0x23(%rbx),%eax
  mov    %eax,0x8(%rsp)
  mov    $0xacdda4e2,%esi
  mov    %ebp,%edi
  call   <sync_word_fuzzy_compare@plt>
  cmp    $0x1,%rax
  adc    $0xffffffba,%r14d
  movl   $0xffffffff,0x28(%rsp)
  movl   $0xffffffff,0x2c(%rsp)
  movslq %r14d,%r13
  shl    $0x2,%r13
  lea    0x30(%rsp),%rsi
  lea    (%r12,%r13,1),%rdi
  mov    0x10(%rsp),%rdx
  call   <demod_adsb_frame@plt>
  mov    %eax,%r15d
  lea    0x2c(%rsp),%rdx
  lea    0x8d0(%rsp),%rsi
  lea    0x4(%r12,%r13,1),%rdi
  call   <demod_adsb_frame@plt>
  mov    %eax,%r13d
  test   %r15d,%r15d
  je     L176
  mov    0x28(%rsp),%eax
  mov    0x2c(%rsp),%edx
  cmp    %edx,%eax
  jle    L106
  test   %r13d,%r13d
  je     L214
L13:
  lea    0x8d0(%rsp),%rsi
  mov    0x1c(%rsp),%eax
  lea    0x1(%r14,%rax,1),%edi
  call   <handle_adsb_frame@plt>
  mov    0x8(%rsp),%ebx
  add    %r13d,%ebx
  jmp    L214
L36:
  mov    $0x53225b1d,%esi
  mov    %ebp,%edi
  call   <sync_word_fuzzy_compare@plt>
  test   %rax,%rax
  jne    L107
  mov    $0x53225b1d,%esi
  mov    0x4(%rsp),%edi
  call   <sync_word_fuzzy_compare@plt>
  test   %rax,%rax
  je     L214
L107:
  lea    -0x23(%rbx),%eax
  mov    %eax,0x8(%rsp)
  mov    $0x53225b1d,%esi
  mov    %ebp,%edi
  call   <sync_word_fuzzy_compare@plt>
  cmp    $0x1,%rax
  adc    $0xffffffba,%r14d
  movl   $0xffffffff,0x28(%rsp)
  movl   $0xffffffff,0x2c(%rsp)
  movslq %r14d,%rax
  lea    0x0(,%rax,4),%r13
  lea    0x30(%rsp),%rsi
  lea    (%r12,%r13,1),%rdi
  mov    0x10(%rsp),%rdx
  call   <demod_uplink_frame@plt>
  mov    %eax,%r15d
  lea    0x2c(%rsp),%rdx
  lea    0x8d0(%rsp),%rsi
  lea    0x4(%r12,%r13,1),%rdi
  call   <demod_uplink_frame@plt>
  mov    %eax,%r13d
  test   %r15d,%r15d
  je     L223
  mov    0x28(%rsp),%eax
  mov    0x2c(%rsp),%edx
  cmp    %edx,%eax
  jle    L190
  test   %r13d,%r13d
  je     L214
L165:
  lea    0x8d0(%rsp),%rsi
  mov    0x1c(%rsp),%eax
  lea    0x1(%r14,%rax,1),%edi
  call   <handle_uplink_frame@plt>
  mov    0x8(%rsp),%ebx
  add    %r13d,%ebx
  jmp    L214
L190:
  lea    0x30(%rsp),%rsi
  mov    0x1c(%rsp),%ecx
  lea    (%r14,%rcx,1),%edi
  mov    %eax,%edx
  call   <handle_uplink_frame@plt>
  mov    0x8(%rsp),%ebx
  add    %r15d,%ebx
  jmp    L214
L223:
  test   %eax,%eax
  je     L214
  mov    0x2c(%rsp),%edx
  cmp    0x28(%rsp),%edx
  jg     L214
  jmp    L165
L219:
  mov    $0x0,%ebx
L202:
  lea    -0x48(%rbx,%rbx,1),%eax
  mov    0x1178(%rsp),%rdx
  sub    %fs:0x28,%rdx
  jne    L19
  add    $0x1188,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L19:
  call   <__stack_chk_fail@plt>
```

assistant: ```c
int process_buffer(uint16_t *phi, int len, uint64_t offset) {
  uint64_t sync0 = 0, sync1 = 0;
  int lenbits;
  int bit;
  uint8_t demod_buf_a[(((6) * ((576) + 160)) / 8)];
  uint8_t demod_buf_b[(((6) * ((576) + 160)) / 8)];
  lenbits = len / 2 - ((36) + ((6) * ((576) + 160)));
  for (bit = 0; bit < lenbits; ++bit) {
    int16_t dphi0 = phi_difference(phi[bit * 2], phi[bit * 2 + 1]);
    int16_t dphi1 = phi_difference(phi[bit * 2 + 1], phi[bit * 2 + 2]);
    sync0 = ((sync0 << 1) | (dphi0 > 0 ? 1 : 0)) & ((((uint64_t)1) << (36)) - 1);
    sync1 = ((sync1 << 1) | (dphi1 > 0 ? 1 : 0)) & ((((uint64_t)1) << (36)) - 1);
    if (bit < (36))
      continue;
    if (sync_word_fuzzy_compare(sync0, 0xEACDDA4E2UL) || sync_word_fuzzy_compare(sync1, 0xEACDDA4E2UL)) {
      int startbit = (bit - (36) + 1);
      int shift = (sync_word_fuzzy_compare(sync0, 0xEACDDA4E2UL) ? 0 : 1);
      int index = startbit * 2 + shift;
      int skip_0, skip_1;
      int rs_0 = -1, rs_1 = -1;
      skip_0 = demod_adsb_frame(phi + index, demod_buf_a, &rs_0);
      skip_1 = demod_adsb_frame(phi + index + 1, demod_buf_b, &rs_1);
      if (skip_0 && rs_0 <= rs_1) {
        handle_adsb_frame(offset + index, demod_buf_a, rs_0);
        bit = startbit + skip_0;
        continue;
      } else if (skip_1 && rs_1 <= rs_0) {
        handle_adsb_frame(offset + index + 1, demod_buf_b, rs_1);
        bit = startbit + skip_1;
        continue;
      } else {
      }
    } else if (sync_word_fuzzy_compare(sync0, 0x153225B1DUL) || sync_word_fuzzy_compare(sync1, 0x153225B1DUL)) {
      int startbit = (bit - (36) + 1);
      int shift = (sync_word_fuzzy_compare(sync0, 0x153225B1DUL) ? 0 : 1);
      int index = startbit * 2 + shift;
      int skip_0, skip_1;
      int rs_0 = -1, rs_1 = -1;
      skip_0 = demod_uplink_frame(phi + index, demod_buf_a, &rs_0);
      skip_1 = demod_uplink_frame(phi + index + 1, demod_buf_b, &rs_1);
      if (skip_0 && rs_0 <= rs_1) {
        handle_uplink_frame(offset + index, demod_buf_a, rs_0);
        bit = startbit + skip_0;
        continue;
      } else if (skip_1 && rs_1 <= rs_0) {
        handle_uplink_frame(offset + index + 1, demod_buf_b, rs_1);
        bit = startbit + skip_1;
        continue;
      } else {
      }
    }
  }
  return (bit - (36)) * 2;
}
```