user: 下面的汇编指令对应的C源代码是什么：

```asm
<schc_decompression>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x38,%rsp
  mov    %rdi,%r12
  mov    %rsi,%rbx
  mov    %edx,0xc(%rsp)
  mov    %fs:0x28,%rax
  mov    %rax,0x28(%rsp)
  xor    %eax,%eax
  movq   $0x80fe,0x18(%rsp)
  movq   $0x2ff,0x20(%rsp)
  movzbl (%rdi),%r14d
  mov    %r14d,%r13d
  shr    $0x7,%r13b
  movsbl %r13b,%r13d
  mov    %r14d,%eax
  sar    $0x6,%al
  and    $0x1,%eax
  mov    %r14d,%r15d
  sar    $0x5,%r15b
  and    $0x1,%r15d
  movb   $0x60,(%rsi)
  movb   $0x0,0x1(%rsi)
  movb   $0x0,0x2(%rsi)
  movb   $0x0,0x3(%rsi)
  mov    $0x6,%ebp
  test   %r13d,%r13d
  jne    L34
  movb   $0x3a,0x6(%rsi)
  mov    $0x7,%ebp
L34:
  movslq %ebp,%rdx
  movb   $0xff,(%rbx,%rdx,1)
  lea    0x1(%rbp),%edi
  test   %al,%al
  jne    L30
  lea    0x18(%rsp),%rsi
  movslq %edi,%rdi
  add    %rbx,%rdi
  mov    $0x8,%edx
  call   <memcpy@plt>
  lea    0x1(%r12),%rsi
  lea    0x9(%rbp),%edi
  movslq %edi,%rdi
  add    %rbx,%rdi
  mov    $0x8,%edx
  call   <memcpy@plt>
  add    $0x11,%ebp
  movl   $0x9,0x8(%rsp)
L7:
  test   %r15b,%r15b
  je     L15
  test   $0x10,%r14b
  jne    L54
  lea    0x18(%rsp),%rsi
  movslq %ebp,%rdi
  add    %rbx,%rdi
  mov    $0x8,%edx
  call   <memcpy@plt>
  mov    0x8(%rsp),%r14d
  movslq %r14d,%rsi
  add    %r12,%rsi
  lea    0x8(%rbp),%edi
  movslq %edi,%rdi
  add    %rbx,%rdi
  mov    $0x8,%edx
  call   <memcpy@plt>
  lea    0x10(%rbp),%ecx
  lea    0x8(%r14),%edx
L99:
  test   %r13d,%r13d
  je     L57
L14:
  mov    0x28(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L46
  mov    %rbx,%rax
  add    $0x38,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L30:
  lea    0x1(%r12),%rsi
  movslq %edi,%rdi
  add    %rbx,%rdi
  mov    $0x10,%edx
  call   <memcpy@plt>
  add    $0x11,%ebp
  movl   $0x11,0x8(%rsp)
  jmp    L7
L15:
  lea    0x20(%rsp),%rsi
  movslq %ebp,%rdi
  add    %rbx,%rdi
  mov    $0x8,%edx
  call   <memcpy@plt>
  mov    0x8(%rsp),%r14d
  movslq %r14d,%rsi
  add    %r12,%rsi
  lea    0x8(%rbp),%edi
  movslq %edi,%rdi
  add    %rbx,%rdi
  mov    $0x8,%edx
  call   <memcpy@plt>
  lea    0x10(%rbp),%ecx
  lea    0x8(%r14),%edx
  jmp    L99
L54:
  mov    0x8(%rsp),%r15d
  movslq %r15d,%rsi
  add    %r12,%rsi
  movslq %ebp,%rdi
  add    %rbx,%rdi
  mov    $0x10,%edx
  call   <memcpy@plt>
  lea    0x10(%rbp),%ecx
  lea    0x10(%r15),%edx
  jmp    L99
L57:
  mov    0xc(%rsp),%r8d
  mov    %rbx,%rsi
  mov    %r12,%rdi
  call   <icmp_decompression@plt>
  jmp    L14
L46:
  call   <__stack_chk_fail@plt>
```

assistant: ```c
char *schc_decompression(char *schc_buffer, char *buffer, int packet_size) {
  int schc_offset = 1;
  int buffer_offset = 0;
  char link_local_feight_bytes[8] = {0xfe, 0x80, 0, 0, 0, 0, 0, 0};
  char multicast_feight_bytes[8] = {0xff, 0x02, 0, 0, 0, 0, 0, 0};
  int schc_header = (schc_buffer[0] >> 7) & 1;
  int schc_src = (schc_buffer[0] >> 6) & 1;
  int multicast = (schc_buffer[0] >> 5) & 1;
  int schc_dst = (schc_buffer[0] >> 4) & 1;
  buffer[0] = 0x60;
  buffer[1] = 0;
  buffer[2] = 0;
  buffer[3] = 0;
  buffer_offset += 4;
  buffer_offset += 2;
  if (schc_header == 0) {
    buffer[buffer_offset] = 0x3a;
    buffer_offset += 1;
  }
  buffer[buffer_offset] = 255;
  buffer_offset += 1;
  if (schc_src == 0) {
    memcpy(&buffer[buffer_offset], &link_local_feight_bytes[0], 8);
    buffer_offset += 8;
    memcpy(&buffer[buffer_offset], &schc_buffer[schc_offset], 8);
    buffer_offset += 8;
    schc_offset += 8;
  } else {
    memcpy(&buffer[buffer_offset], &schc_buffer[schc_offset], 16);
    buffer_offset += 16;
    schc_offset += 16;
  }
  if (multicast == 0) {
    memcpy(&buffer[buffer_offset], &multicast_feight_bytes[0], 8);
    buffer_offset += 8;
    memcpy(&buffer[buffer_offset], &schc_buffer[schc_offset], 8);
    buffer_offset += 8;
    schc_offset += 8;
  } else {
    if (schc_dst == 0) {
      memcpy(&buffer[buffer_offset], &link_local_feight_bytes[0], 8);
      buffer_offset += 8;
      memcpy(&buffer[buffer_offset], &schc_buffer[schc_offset], 8);
      buffer_offset += 8;
      schc_offset += 8;
    } else {
      memcpy(&buffer[buffer_offset], &schc_buffer[schc_offset], 16);
      buffer_offset += 16;
      schc_offset += 16;
    }
  }
  if (schc_header == 0) {
    icmp_decompression(schc_buffer, buffer, schc_offset, buffer_offset, packet_size);
  }
  return buffer;
}
```