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

```asm
<hash_djbx33>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %rbx
  mov    %rdi,%rax
  mov    %rsi,%rdx
  mov    $0x1505,%ebx
  jmp    L26
L39:
  mov    %rbx,%rcx
  shl    $0x5,%rcx
  lea    (%rbx,%rcx,1),%rsi
  mov    %rax,%rcx
  lea    0x1(%rcx),%rax
  movzbl (%rcx),%ecx
  movzbl %cl,%ecx
  lea    (%rsi,%rcx,1),%rbx
  mov    %rbx,%rcx
  shl    $0x5,%rcx
  lea    (%rbx,%rcx,1),%rsi
  mov    %rax,%rcx
  lea    0x1(%rcx),%rax
  movzbl (%rcx),%ecx
  movzbl %cl,%ecx
  lea    (%rsi,%rcx,1),%rbx
  mov    %rbx,%rcx
  shl    $0x5,%rcx
  lea    (%rbx,%rcx,1),%rsi
  mov    %rax,%rcx
  lea    0x1(%rcx),%rax
  movzbl (%rcx),%ecx
  movzbl %cl,%ecx
  lea    (%rsi,%rcx,1),%rbx
  mov    %rbx,%rcx
  shl    $0x5,%rcx
  lea    (%rbx,%rcx,1),%rsi
  mov    %rax,%rcx
  lea    0x1(%rcx),%rax
  movzbl (%rcx),%ecx
  movzbl %cl,%ecx
  lea    (%rsi,%rcx,1),%rbx
  mov    %rbx,%rcx
  shl    $0x5,%rcx
  lea    (%rbx,%rcx,1),%rsi
  mov    %rax,%rcx
  lea    0x1(%rcx),%rax
  movzbl (%rcx),%ecx
  movzbl %cl,%ecx
  lea    (%rsi,%rcx,1),%rbx
  mov    %rbx,%rcx
  shl    $0x5,%rcx
  lea    (%rbx,%rcx,1),%rsi
  mov    %rax,%rcx
  lea    0x1(%rcx),%rax
  movzbl (%rcx),%ecx
  movzbl %cl,%ecx
  lea    (%rsi,%rcx,1),%rbx
  mov    %rbx,%rcx
  shl    $0x5,%rcx
  lea    (%rbx,%rcx,1),%rsi
  mov    %rax,%rcx
  lea    0x1(%rcx),%rax
  movzbl (%rcx),%ecx
  movzbl %cl,%ecx
  lea    (%rsi,%rcx,1),%rbx
  mov    %rbx,%rcx
  shl    $0x5,%rcx
  lea    (%rbx,%rcx,1),%rsi
  mov    %rax,%rcx
  lea    0x1(%rcx),%rax
  movzbl (%rcx),%ecx
  movzbl %cl,%ecx
  lea    (%rsi,%rcx,1),%rbx
  sub    $0x8,%rdx
L26:
  cmp    $0x7,%rdx
  ja     L39
  cmp    $0x7,%rdx
  ja     L0
  lea    0x0(,%rdx,4),%rcx
  lea    D19(%rip),%rdx
  mov    (%rcx,%rdx,1),%edx
  movslq %edx,%rdx
  lea    D19(%rip),%rcx
  add    %rcx,%rdx
  notrack jmp *%rdx
  mov    %rbx,%rdx
  shl    $0x5,%rdx
  lea    (%rbx,%rdx,1),%rcx
  mov    %rax,%rdx
  lea    0x1(%rdx),%rax
  movzbl (%rdx),%edx
  movzbl %dl,%edx
  lea    (%rcx,%rdx,1),%rbx
  mov    %rbx,%rdx
  shl    $0x5,%rdx
  lea    (%rbx,%rdx,1),%rcx
  mov    %rax,%rdx
  lea    0x1(%rdx),%rax
  movzbl (%rdx),%edx
  movzbl %dl,%edx
  lea    (%rcx,%rdx,1),%rbx
  mov    %rbx,%rdx
  shl    $0x5,%rdx
  lea    (%rbx,%rdx,1),%rcx
  mov    %rax,%rdx
  lea    0x1(%rdx),%rax
  movzbl (%rdx),%edx
  movzbl %dl,%edx
  lea    (%rcx,%rdx,1),%rbx
  mov    %rbx,%rdx
  shl    $0x5,%rdx
  lea    (%rbx,%rdx,1),%rcx
  mov    %rax,%rdx
  lea    0x1(%rdx),%rax
  movzbl (%rdx),%edx
  movzbl %dl,%edx
  lea    (%rcx,%rdx,1),%rbx
  mov    %rbx,%rdx
  shl    $0x5,%rdx
  lea    (%rbx,%rdx,1),%rcx
  mov    %rax,%rdx
  lea    0x1(%rdx),%rax
  movzbl (%rdx),%edx
  movzbl %dl,%edx
  lea    (%rcx,%rdx,1),%rbx
  mov    %rbx,%rdx
  shl    $0x5,%rdx
  lea    (%rbx,%rdx,1),%rcx
  mov    %rax,%rdx
  lea    0x1(%rdx),%rax
  movzbl (%rdx),%edx
  movzbl %dl,%edx
  lea    (%rcx,%rdx,1),%rbx
  mov    %rbx,%rdx
  shl    $0x5,%rdx
  lea    (%rbx,%rdx,1),%rcx
  mov    %rax,%rdx
  lea    0x1(%rdx),%rax
  movzbl (%rdx),%eax
  movzbl %al,%eax
  lea    (%rcx,%rax,1),%rbx
  jmp    L3
L0:
  nop
L3:
  mov    %rbx,%rax
  mov    -0x8(%rbp),%rbx
  leave
  ret
```

assistant: ```c
unsigned long hash_djbx33(register unsigned char *key, register size_t len) {
  register unsigned long hash = 5381;
  for (; len >= 8; len -= 8) {
    hash = ((hash << 5) + hash) + *key++;
    hash = ((hash << 5) + hash) + *key++;
    hash = ((hash << 5) + hash) + *key++;
    hash = ((hash << 5) + hash) + *key++;
    hash = ((hash << 5) + hash) + *key++;
    hash = ((hash << 5) + hash) + *key++;
    hash = ((hash << 5) + hash) + *key++;
    hash = ((hash << 5) + hash) + *key++;
  }
  switch (len) {
  case 7:
    hash = ((hash << 5) + hash) + *key++;
  case 6:
    hash = ((hash << 5) + hash) + *key++;
  case 5:
    hash = ((hash << 5) + hash) + *key++;
  case 4:
    hash = ((hash << 5) + hash) + *key++;
  case 3:
    hash = ((hash << 5) + hash) + *key++;
  case 2:
    hash = ((hash << 5) + hash) + *key++;
  case 1:
    hash = ((hash << 5) + hash) + *key++;
    break;
  default:
    break;
  }
  return hash;
}
```