user: Please show me the C implementation that matches the assembly code listed below:

```asm
<schc_decompression>:
  endbr64
  push   %r15
  mov    %rdi,%r15
  push   %r14
  push   %r13
  mov    %rsi,%r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x48,%rsp
  movzbl (%rdi),%ebx
  mov    %edx,0x14(%rsp)
  mov    %ebx,%r12d
  mov    %ebx,%r14d
  sar    $0x5,%r12b
  mov    %fs:0x28,%rax
  mov    %rax,0x38(%rsp)
  xor    %eax,%eax
  mov    %ebx,%eax
  and    $0x1,%r12d
  movl   $0x60,(%rsi)
  movq   $0x80fe,0x28(%rsp)
  sar    $0x6,%al
  movq   $0x2ff,0x30(%rsp)
  and    $0x1,%eax
  shr    $0x7,%r14b
  jne    L35
  movb   $0x3a,0x6(%rsi)
  mov    $0x18,%ebp
  mov    $0x8,%edi
  mov    $0x10,%r8d
  movl   $0x28,0x10(%rsp)
  mov    $0x7,%edx
  movl   $0x18,0x4(%rsp)
L66:
  mov    %r8,0x8(%rsp)
  lea    0x1(%r15),%r11
  add    %r13,%rdi
  movb   $0xff,0x0(%r13,%rdx,1)
  test   %al,%al
  jne    L36
  lea    0x28(%rsp),%rsi
  mov    $0x8,%edx
  mov    %r11,0x18(%rsp)
  call   <memcpy@plt>
  mov    0x8(%rsp),%r8
  mov    0x18(%rsp),%rsi
  mov    $0x8,%edx
  lea    0x0(%r13,%r8,1),%rdi
  call   <memcpy@plt>
  mov    $0x9,%r8d
  mov    $0x11,%r11d
  mov    $0x19,%r9d
  add    %r15,%r8
  lea    0x0(%r13,%rbp,1),%rdi
  test   %r12b,%r12b
  je     L21
L30:
  and    $0x10,%ebx
  mov    %r11d,0x8(%rsp)
  je     L104
  mov    $0x10,%edx
  mov    %r8,%rsi
  mov    %r9d,0x4(%rsp)
  call   <memcpy@plt>
  mov    0x4(%rsp),%r11d
  test   %r14b,%r14b
  je     L59
L64:
  mov    0x38(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L79
  add    $0x48,%rsp
  mov    %r13,%rax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  xchg   %ax,%ax
L35:
  mov    $0xf,%r8d
  mov    $0x17,%ebp
  mov    $0x7,%edi
  movl   $0x27,0x10(%rsp)
  movl   $0x17,0x4(%rsp)
  mov    $0x6,%edx
  jmp    L66
  nopw   0x0(%rax,%rax,1)
L36:
  mov    %r11,%rsi
  mov    $0x10,%edx
  call   <memcpy@plt>
  mov    $0x11,%r8d
  mov    $0x19,%r11d
  mov    $0x21,%r9d
  add    %r15,%r8
  lea    0x0(%r13,%rbp,1),%rdi
  test   %r12b,%r12b
  jne    L30
L21:
  mov    %r8,0x18(%rsp)
  lea    0x30(%rsp),%rsi
  mov    %r11d,0x8(%rsp)
  jmp    L39
  nopl   0x0(%rax)
L104:
  mov    %r8,0x18(%rsp)
  lea    0x28(%rsp),%rsi
L39:
  mov    $0x8,%edx
  call   <memcpy@plt>
  mov    0x4(%rsp),%edi
  mov    0x18(%rsp),%rsi
  mov    $0x8,%edx
  add    $0x8,%edi
  movslq %edi,%rdi
  add    %r13,%rdi
  call   <memcpy@plt>
  mov    0x8(%rsp),%r11d
  test   %r14b,%r14b
  jne    L64
L59:
  mov    0x14(%rsp),%r8d
  mov    0x10(%rsp),%ecx
  mov    %r11d,%edx
  mov    %r13,%rsi
  mov    %r15,%rdi
  call   <icmp_decompression@plt>
  jmp    L64
L79:
  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;
}
```