user: 这段汇编代码用C语言表示是什么样的?

```asm
<MD4_Update>:
  endbr64
  test   %rdx,%rdx
  je     L483
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  mov    %rdi,%rbp
  mov    %rsi,%r12
  mov    %rdx,%rbx
  mov    (%rdi),%edx
  lea    (%rdx,%rbx,8),%eax
  cmp    %eax,%edx
  jle    L254
  addq   $0x1,0x10(%rdi)
L254:
  mov    %rbx,%rdx
  shr    $0x1d,%rdx
  add    %rdx,0x10(%rbp)
  mov    %eax,0x0(%rbp)
  mov    0x4(%rbp),%edx
  test   %edx,%edx
  je     L150
  mov    0x8(%rbp),%rsi
  mov    %edx,%eax
  sar    $0x2,%eax
  cltq
  mov    %edx,%ecx
  and    $0x3,%ecx
  movslq %edx,%rdi
  add    %rbx,%rdi
  mov    D17(%rip),%r8
  cmp    (%r8),%rdi
  jb     L262
  lea    (%rsi,%rax,4),%rdi
  mov    (%rdi),%edx
  cmp    $0x2,%ecx
  je     L114
  cmp    $0x2,%ecx
  jg     L57
  test   %ecx,%ecx
  je     L277
  cmp    $0x1,%ecx
  jne    L475
L419:
  lea    0x1(%r12),%rcx
  movzbl (%r12),%r8d
  shl    $0x8,%r8
  or     %r8d,%edx
L5:
  lea    0x1(%rcx),%r12
  movzbl (%rcx),%ecx
  shl    $0x10,%rcx
  or     %ecx,%edx
L57:
  lea    0x1(%r12),%r13
  movzbl (%r12),%ecx
  shl    $0x18,%rcx
  or     %ecx,%edx
L441:
  add    $0x1,%rax
  mov    %edx,(%rdi)
  mov    D16(%rip),%rdx
  cmp    (%rdx),%rax
  jae    L417
  mov    %rdx,%rcx
L394:
  mov    0x0(%r13),%edx
  add    $0x4,%r13
  mov    %edx,(%rsi,%rax,4)
  add    $0x1,%rax
  cmp    %rax,(%rcx)
  ja     L394
L417:
  mov    $0x1,%edx
  mov    %rbp,%rdi
  call   <md4_block_host_order@plt>
  movslq 0x4(%rbp),%rax
  add    %rbx,%rax
  mov    D17(%rip),%rdx
  sub    (%rdx),%rax
  mov    %rax,%rbx
  movl   $0x0,0x4(%rbp)
  mov    (%rdx),%rcx
  cmp    %rax,%rcx
  ja     L230
  mov    $0x0,%edx
  div    %rcx
  mov    %rax,%r14
  mov    %r13,%r12
  jmp    L63
L475:
  mov    %r12,%r13
  jmp    L441
L277:
  movzbl (%r12),%edx
  lea    0x1(%r12),%r12
  jmp    L419
L114:
  mov    %r12,%rcx
  jmp    L5
L262:
  movslq %ecx,%rdi
  add    %ebx,%edx
  mov    %edx,0x4(%rbp)
  lea    (%rbx,%rdi,1),%r8
  cmp    $0x3,%r8
  ja     L188
  lea    (%rsi,%rax,4),%rdx
  mov    (%rdx),%eax
  cmp    $0x1,%ecx
  je     L183
  cmp    $0x2,%ecx
  je     L181
  test   %ecx,%ecx
  je     L89
L332:
  mov    %eax,(%rdx)
  jmp    L249
L89:
  movzbl (%r12),%eax
  sub    $0x1,%rbx
  je     L332
  add    $0x1,%r12
L183:
  movzbl (%r12),%ecx
  shl    $0x8,%rcx
  or     %ecx,%eax
  cmp    $0x1,%rbx
  je     L332
  add    $0x1,%r12
L181:
  movzbl (%r12),%ecx
  shl    $0x10,%rcx
  or     %ecx,%eax
  jmp    L332
L188:
  mov    %edx,%r8d
  sar    $0x2,%r8d
  movslq %r8d,%r8
  mov    %edx,%r11d
  and    $0x3,%r11d
  and    $0x3,%edx
  test   %rdi,%rdi
  je     L41
  mov    (%rsi,%rax,4),%edi
  cmp    $0x2,%ecx
  je     L53
  cmp    $0x2,%ecx
  jg     L156
  mov    %r12,%r10
  cmp    $0x1,%ecx
  jne    L213
L147:
  lea    0x1(%r12),%rcx
  movzbl (%r12),%r9d
  shl    $0x8,%r9
  or     %r9d,%edi
L243:
  lea    0x1(%rcx),%r12
  movzbl (%rcx),%ecx
  shl    $0x10,%rcx
  or     %ecx,%edi
L156:
  lea    0x1(%r12),%r10
  movzbl (%r12),%ecx
  shl    $0x18,%rcx
  or     %ecx,%edi
L213:
  lea    0x1(%rax),%rcx
  mov    %edi,(%rsi,%rax,4)
  cmp    %rcx,%r8
  jbe    L40
  mov    %rax,%rdi
  neg    %rdi
  lea    (%r10,%rdi,4),%r9
L265:
  mov    -0x4(%r9,%rcx,4),%edi
  mov    %edi,(%rsi,%rcx,4)
  add    $0x1,%rcx
  cmp    %rcx,%r8
  jne    L265
  mov    %rcx,%rdi
  sub    %rax,%rdi
  lea    -0x4(%r10,%rdi,4),%r10
L40:
  test   %rdx,%rdx
  je     L249
  add    %rdx,%r10
  cmp    $0x2,%r11d
  je     L257
  cmp    $0x3,%r11d
  je     L274
  mov    $0x0,%eax
  cmp    $0x1,%r11d
  jne    L227
  mov    $0x0,%edx
  jmp    L425
L41:
  movzbl (%r12),%edi
  lea    0x1(%r12),%r12
  jmp    L147
L53:
  mov    %r12,%rcx
  jmp    L243
L274:
  movzbl -0x1(%r10),%edx
  shl    $0x10,%edx
  lea    -0x1(%r10),%r10
L23:
  movzbl -0x1(%r10),%eax
  shl    $0x8,%rax
  or     %eax,%edx
  lea    -0x1(%r10),%r10
L425:
  movzbl -0x1(%r10),%eax
  or     %edx,%eax
L227:
  mov    %eax,(%rsi,%rcx,4)
  jmp    L249
L257:
  mov    $0x0,%edx
  jmp    L23
L286:
  mov    %r13,%r12
  jmp    L47
L153:
  movzbl -0x1(%r12),%edx
  shl    $0x10,%edx
  lea    -0x1(%r12),%r12
L366:
  movzbl -0x1(%r12),%eax
  shl    $0x8,%rax
  or     %eax,%edx
  lea    -0x1(%r12),%r12
L387:
  movzbl -0x1(%r12),%eax
  or     %edx,%eax
L482:
  mov    %eax,(%rcx)
  jmp    L249
L29:
  mov    $0x0,%edx
  jmp    L366
L150:
  mov    D17(%rip),%rax
  mov    (%rax),%rcx
  cmp    %rcx,%rbx
  jae    L432
L47:
  mov    0x8(%rbp),%rcx
  mov    %ebx,0x4(%rbp)
  mov    %rbx,%rsi
  and    $0x3,%esi
  shr    $0x2,%rbx
  je     L217
  shl    $0x2,%rbx
  mov    $0x0,%eax
L376:
  mov    (%r12,%rax,1),%edx
  mov    %edx,(%rcx,%rax,1)
  add    $0x4,%rax
  cmp    %rbx,%rax
  jne    L376
  add    %rbx,%r12
  add    %rbx,%rcx
L217:
  add    %rsi,%r12
  cmp    $0x2,%rsi
  je     L29
  cmp    $0x3,%rsi
  je     L153
  mov    $0x0,%eax
  cmp    $0x1,%rsi
  jne    L482
  mov    $0x0,%edx
  jmp    L387
L432:
  mov    %rbx,%rax
  mov    $0x0,%edx
  div    %rcx
  mov    %rax,%r14
L63:
  mov    %r14,%rdx
  mov    %r12,%rsi
  mov    %rbp,%rdi
  call   <md4_block_data_order@plt>
  mov    D17(%rip),%rax
  imul   (%rax),%r14
  lea    (%r12,%r14,1),%r13
  sub    %r14,%rbx
L230:
  test   %rbx,%rbx
  jne    L286
L249:
  mov    $0x1,%eax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  ret
L483:
  mov    $0x1,%eax
  ret
```

assistant: ```c
int MD4_Update(MD4_CTX *c, const void *data_, size_t len) {
  const unsigned char *data = data_;
  register MD4_LONG *p;
  register MD4_LONG l;
  size_t sw, sc, ew, ec;
  if (len == 0)
    return 1;
  l = (c->Nl + (((MD4_LONG)len) << 3)) & 0xffffffffUL;
  if (l < c->Nl)
    c->Nh++;
  c->Nh += (len >> 29);
  c->Nl = l;
  if (c->num != 0) {
    p = c->data;
    sw = c->num >> 2;
    sc = c->num & 0x03;
    if ((c->num + len) >= MD4_CBLOCK) {
      l = p[sw];
      {
        switch (sc) {
        case 0:
          l = ((unsigned long)(*((data)++)));
        case 1:
          l |= ((unsigned long)(*((data)++))) << 8;
        case 2:
          l |= ((unsigned long)(*((data)++))) << 16;
        case 3:
          l |= ((unsigned long)(*((data)++))) << 24;
        }
      };
      p[sw++] = l;
      for (; sw < MD4_LBLOCK; sw++) {
        ((l) = *((const unsigned int *)(data)), (data) += 4, l);
        p[sw] = l;
      }
      md4_block_host_order(c, p, 1);
      len -= (MD4_CBLOCK - c->num);
      c->num = 0;
    } else {
      c->num += (unsigned int)len;
      if ((sc + len) < 4) {
        l = p[sw];
        {
          switch (sc) {
          case 0:
            l = ((unsigned long)(*((data)++)));
            if (--len == 0)
              break;
          case 1:
            l |= ((unsigned long)(*((data)++))) << 8;
            if (--len == 0)
              break;
          case 2:
            l |= ((unsigned long)(*((data)++))) << 16;
          }
        };
        p[sw] = l;
      } else {
        ew = (c->num >> 2);
        ec = (c->num & 0x03);
        if (sc)
          l = p[sw];
        {
          switch (sc) {
          case 0:
            l = ((unsigned long)(*((data)++)));
          case 1:
            l |= ((unsigned long)(*((data)++))) << 8;
          case 2:
            l |= ((unsigned long)(*((data)++))) << 16;
          case 3:
            l |= ((unsigned long)(*((data)++))) << 24;
          }
        };
        p[sw++] = l;
        for (; sw < ew; sw++) {
          ((l) = *((const unsigned int *)(data)), (data) += 4, l);
          p[sw] = l;
        }
        if (ec) {
          {
            l = 0;
            (data) += ec;
            switch (ec) {
            case 3:
              l = ((unsigned long)(*(--(data)))) << 16;
            case 2:
              l |= ((unsigned long)(*(--(data)))) << 8;
            case 1:
              l |= ((unsigned long)(*(--(data))));
            }
          };
          p[sw] = l;
        }
      }
      return 1;
    }
  }
  sw = len / MD4_CBLOCK;
  if (sw > 0) {
    {
      md4_block_data_order(c, data, sw);
      sw *= MD4_CBLOCK;
      data += sw;
      len -= sw;
    }
  }
  if (len != 0) {
    p = c->data;
    c->num = len;
    ew = len >> 2;
    ec = len & 0x03;
    for (; ew; ew--, p++) {
      ((l) = *((const unsigned int *)(data)), (data) += 4, l);
      *p = l;
    }
    {
      l = 0;
      (data) += ec;
      switch (ec) {
      case 3:
        l = ((unsigned long)(*(--(data)))) << 16;
      case 2:
        l |= ((unsigned long)(*(--(data)))) << 8;
      case 1:
        l |= ((unsigned long)(*(--(data))));
      }
    };
    *p = l;
  }
  return 1;
}
```