user: 提供的汇编代码用C语言表示会是什么样子：

```asm
<unpack_c>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  mov    %edi,%ebx
  mov    %esi,-0x4(%rsp)
  mov    %rdx,%rbp
  mov    %rcx,%r12
  sub    $0x1,%r9d
  mov    $0x80000000,%ecx
  mov    $0xffffffff,%edi
  test   %ebx,%ebx
  jne    L51
L278:
  lea    0x4(%rbp),%rdx
  lea    0x4(%r12),%rsi
  mov    0x0(%rbp),%eax
  mov    %eax,(%r12)
  sub    $0x1,%r9d
L52:
  test   %r9d,%r9d
  js     L219
  mov    -0x4(%rsp),%eax
  lea    -0x1(%rax),%r10d
  mov    %ecx,%r15d
  mov    %rsi,%r12
  mov    %rdx,%rbp
  mov    $0xffffffff,%eax
  mov    $0x0,%r14d
  mov    $0x0,%r13d
  jmp    L5
L51:
  mov    %r12,%rax
  sub    %r8,%rax
  sar    $0x2,%rax
  sub    %eax,%ebx
  mov    %r12,%rsi
  jmp    L52
L119:
  mov    0x0(%rbp),%r15d
  lea    0x1(%r15,%r15,1),%ecx
  lea    0x10(%rbp),%rbp
  jmp    L217
L64:
  lea    0x10(%rbp),%rsi
  mov    0x0(%rbp),%eax
  lea    0x1(%rax,%rax,1),%ecx
  jmp    L174
L359:
  mov    (%rsi),%edx
  lea    0x1(%rdx,%rdx,1),%ecx
  lea    0x10(%rsi),%rsi
L175:
  sar    $0x1f,%edx
  movslq %edx,%rdx
  lea    (%rdx,%rbp,2),%rbp
  add    %r11d,%r11d
  lea    (%r15,%rax,1),%edx
  cmp    %r11d,%edx
  jle    L274
L182:
  test   $0x5ffc00,%r11d
  je     L85
  lea    (%rax,%rax,8),%eax
  sar    $0x3,%eax
L85:
  movslq %eax,%rdx
  cmp    %rbp,%rdx
  jg     L163
  sub    %eax,%edi
  add    %eax,%r15d
  add    %eax,%eax
  test   $0x7fffffff,%ecx
  je     L359
  mov    %ecx,%edx
  add    %ecx,%ecx
  jmp    L175
L46:
  mov    $0x200,%r11d
  mov    $0x0,%edi
L274:
  sub    %r15d,%r11d
  movslq %r11d,%r11
  cmp    %rbp,%r11
  jg     L163
  test   $0x7fffffff,%ecx
  je     L280
  mov    %ecx,%eax
  add    %ecx,%ecx
L66:
  sar    $0x1f,%eax
  cltq
  lea    (%rax,%rbp,2),%rbp
  sub    %r11,%rbp
L163:
  add    %ebp,%edi
  lea    0x1(%rdi),%eax
  mov    $0x2,%r11d
  cmp    $0x1517,%eax
  jle    L196
  cmp    $0x5ffff,%eax
  setg   %r11b
  movzbl %r11b,%r11d
  add    $0x3,%r11d
L196:
  not    %edi
L266:
  test   $0x7fffffff,%ecx
  je     L97
  lea    (%rcx,%rcx,1),%eax
L330:
  test   %ecx,%ecx
  js     L242
  test   $0x7fffffff,%eax
  je     L210
  lea    (%rax,%rax,1),%r15d
  mov    %rsi,%rbp
L320:
  sar    $0x1f,%eax
  add    %eax,%r11d
L113:
  sub    %r11d,%r9d
  mov    %r12,%rsi
  sub    %r8,%rsi
  sar    $0x2,%rsi
  add    %edi,%esi
  mov    %esi,%eax
  add    %r11d,%esi
  mov    %r12,%rcx
L335:
  mov    %eax,%edx
  and    %r10d,%edx
  movslq %edx,%rdx
  mov    (%r8,%rdx,4),%edx
  mov    %edx,(%rcx)
  add    $0x1,%eax
  add    $0x4,%rcx
  cmp    %esi,%eax
  jne    L335
  lea    -0x1(%r11),%eax
  lea    0x4(%r12,%rax,4),%r12
  mov    %r13d,%eax
  test   %r9d,%r9d
  js     L219
L5:
  test   $0x7fffffff,%r15d
  je     L119
  lea    (%r15,%r15,1),%ecx
L217:
  test   %r15d,%r15d
  jns    L278
  test   %eax,%eax
  jns    L225
  test   $0x7fffffff,%ecx
  je     L64
  mov    %ecx,%eax
  add    %ecx,%ecx
  mov    %rbp,%rsi
L174:
  mov    $0x1,%r11d
  test   %eax,%eax
  jns    L266
  mov    %rsi,%rbp
L225:
  mov    %r12,%r15
  sub    %r8,%r15
  sar    $0x2,%r15
  add    %ebx,%r15d
  cmp    $0x61a80,%r15d
  jg     L89
  lea    0x4(%rbp),%rsi
  movslq 0x0(%rbp),%rbp
  cmp    $0x1c4,%r15d
  jle    L46
  mov    $0x3c,%eax
  jmp    L282
L280:
  mov    (%rsi),%eax
  lea    0x1(%rax,%rax,1),%ecx
  lea    0x10(%rsi),%rsi
  jmp    L66
L97:
  mov    (%rsi),%ecx
  lea    0x1(%rcx,%rcx,1),%eax
  lea    0x10(%rsi),%rsi
  jmp    L330
L210:
  lea    0x10(%rsi),%rbp
  mov    (%rsi),%eax
  lea    0x1(%rax,%rax,1),%r15d
  jmp    L320
L242:
  add    $0x2,%r11d
  mov    %r14,%rcx
  jmp    L221
L150:
  mov    (%rsi),%eax
  lea    0x1(%rax,%rax,1),%edx
  lea    0x10(%rsi),%rsi
  jmp    L139
L311:
  mov    (%rsi),%edx
  lea    0x1(%rdx,%rdx,1),%eax
  lea    0x10(%rsi),%rsi
L32:
  test   %edx,%edx
  jns    L264
  add    $0x1,%rcx
L221:
  test   $0x7fffffff,%eax
  je     L150
  lea    (%rax,%rax,1),%edx
L139:
  sar    $0x1f,%eax
  cltq
  lea    (%rax,%rcx,2),%rcx
  test   $0x7fffffff,%edx
  je     L311
  lea    (%rdx,%rdx,1),%eax
  jmp    L32
L264:
  add    %ecx,%r11d
  mov    %eax,%r15d
  mov    %rsi,%rbp
  jmp    L113
L89:
  lea    0x4(%rbp),%rsi
  movslq 0x0(%rbp),%rbp
  mov    $0x32,%eax
L282:
  mov    $0x200,%r11d
  mov    $0x0,%edi
  jmp    L182
L219:
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
```

assistant: ```c
void unpack_c(int current_history_size, int history_size, uint8_t *src, uint8_t *dst, uint8_t *start, int left) {
  int ofs = -1;
  int len;
  uint32_t bits = 0x80000000;
  uint32_t resbits;
  left--;
  history_size--;
  if (current_history_size) {
    current_history_size -= dst - start;
    goto nextblock;
  }
copyletter:
  *dst++ = *src++;
  left--;
nextblock:
  len = -1;
get_bit:
  if (left < 0)
    return;
  if (((bits = bits & 0x7fffffff ? (resbits = bits, bits + bits) : (src += 4, resbits = *((uint32_t *)(src - 4)), (resbits << 1) + 1)), resbits >> 31) == 0)
    goto copyletter;
  if (len < 0) {
    len = 1;
    if (!((bits = bits & 0x7fffffff ? (resbits = bits, bits + bits) : (src += 4, resbits = *((uint32_t *)(src - 4)), (resbits << 1) + 1)), resbits >> 31)) {
      goto uselastofs;
    }
  }
  len = 2;
  {
    int total = (dst - start + current_history_size);
    ofs = 0;
    long int res = 0;
    int x = 256;
    int top = 0;
    top = ((total <= 400000) ? 60 : 50);
    res = *src++;
    while (1) {
      x += x;
      if (x >= total + top)
        break;
      if (x & 0x002FFe00 * 2)
        top = ((9 * top) >> 3);
      if (res < top) {
        goto getcode_doneit;
      }
      ofs -= top;
      total += top;
      top += top;
      res += res + ((bits = bits & 0x7fffffff ? (resbits = bits, bits + bits) : (src += 4, resbits = *((uint32_t *)(src - 4)), (resbits << 1) + 1)), resbits >> 31);
    }
    x -= total;
    if (res >= x) {
      res += res + ((bits = bits & 0x7fffffff ? (resbits = bits, bits + bits) : (src += 4, resbits = *((uint32_t *)(src - 4)), (resbits << 1) + 1)), resbits >> 31);
      res -= x;
    }
  getcode_doneit:
    ofs += res;
  };
  ofs++;
  if (ofs >= 5400)
    len++;
  if (ofs >= 0x060000)
    len++;
  ofs = -ofs;
uselastofs : {
  long int res = 0;
  if (((bits = bits & 0x7fffffff ? (resbits = bits, bits + bits) : (src += 4, resbits = *((uint32_t *)(src - 4)), (resbits << 1) + 1)), resbits >> 31) == 0) {
    len += ((bits = bits & 0x7fffffff ? (resbits = bits, bits + bits) : (src += 4, resbits = *((uint32_t *)(src - 4)), (resbits << 1) + 1)), resbits >> 31);
    goto getlen_0bit;
  }
  len += 2;
  while (1) {
    res += res + ((bits = bits & 0x7fffffff ? (resbits = bits, bits + bits) : (src += 4, resbits = *((uint32_t *)(src - 4)), (resbits << 1) + 1)), resbits >> 31);
    if (((bits = bits & 0x7fffffff ? (resbits = bits, bits + bits) : (src += 4, resbits = *((uint32_t *)(src - 4)), (resbits << 1) + 1)), resbits >> 31) == 0)
      break;
    res++;
  }
  len += res;
getlen_0bit:;
};
  left -= len;
  int ptr = dst - start + ofs;
  do {
    *dst = start[ptr & (history_size)];
    ptr++;
    dst++;
  } while (--len);
  goto get_bit;
}
```