user: 这段汇编代码用C语言表示是什么样的:

```asm
<zipcode_read_sector>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x18,%rsp
  mov    %rdi,%r12
  mov    %esi,%ebp
  mov    %rdx,%r13
  mov    %rcx,%rbx
  mov    %fs:0x28,%rax
  mov    %rax,0x8(%rsp)
  xor    %eax,%eax
  lea    0x2(%rsp),%rdi
  mov    %r12,%rcx
  mov    $0x1,%edx
  mov    $0x1,%esi
  call   <fread@plt>
  mov    %eax,%r14d
  lea    0x3(%rsp),%rdi
  mov    %r12,%rcx
  mov    $0x1,%edx
  mov    $0x1,%esi
  call   <fread@plt>
  movzbl 0x3(%rsp),%edx
  mov    %edx,0x0(%r13)
  movzbl 0x2(%rsp),%edx
  mov    %edx,%ecx
  and    $0x3f,%ecx
  cmp    %ebp,%ecx
  jne    L32
  test   %r14d,%r14d
  je     L281
  test   %eax,%eax
  je     L281
  test   %dl,%dl
  js     L233
  test   $0x40,%dl
  je     L198
  lea    0x7(%rsp),%rdi
  mov    %r12,%rcx
  mov    $0x1,%edx
  mov    $0x1,%esi
  call   <fread@plt>
  test   %eax,%eax
  je     L123
  movzbl 0x7(%rsp),%ecx
  mov    %rbx,%rax
  lea    0x100(%rbx),%rdx
L23:
  mov    %cl,(%rax)
  add    $0x1,%rax
  cmp    %rax,%rdx
  jne    L23
  mov    $0x0,%eax
  jmp    L115
L233:
  lea    0x4(%rsp),%rdi
  mov    %r12,%rcx
  mov    $0x1,%edx
  mov    $0x1,%esi
  call   <fread@plt>
  mov    %eax,%ebp
  lea    0x5(%rsp),%rdi
  mov    %r12,%rcx
  mov    $0x1,%edx
  mov    $0x1,%esi
  call   <fread@plt>
  test   %ebp,%ebp
  je     L58
  test   %eax,%eax
  je     L58
  cmpb   $0x0,0x4(%rsp)
  je     L56
  mov    $0x0,%ebp
  mov    $0x0,%r13d
  lea    0x7(%rsp),%r14
  jmp    L215
L73:
  lea    0x6(%rsp),%rdi
  mov    %r12,%rcx
  mov    $0x1,%edx
  mov    $0x1,%esi
  call   <fread@plt>
  mov    %eax,%r15d
  mov    %r12,%rcx
  mov    $0x1,%edx
  mov    $0x1,%esi
  mov    %r14,%rdi
  call   <fread@plt>
  test   %r15d,%r15d
  je     L207
  test   %eax,%eax
  je     L207
  add    $0x2,%r13d
  movzbl 0x6(%rsp),%edx
  test   %edx,%edx
  je     L251
  movzbl 0x7(%rsp),%ecx
  add    %ebp,%edx
L68:
  mov    %ebp,%eax
  add    $0x1,%ebp
  mov    %eax,%eax
  mov    %cl,(%rbx,%rax,1)
  cmp    %ebp,%edx
  jne    L68
  mov    %edx,%ebp
L251:
  add    $0x1,%r13d
  movzbl 0x4(%rsp),%eax
  cmp    %r13d,%eax
  jbe    L65
L215:
  mov    %r12,%rcx
  mov    $0x1,%edx
  mov    $0x1,%esi
  mov    %r14,%rdi
  call   <fread@plt>
  test   %eax,%eax
  je     L289
  movzbl 0x7(%rsp),%eax
  cmp    0x5(%rsp),%al
  je     L73
  mov    %ebp,%edx
  mov    %al,(%rbx,%rdx,1)
  lea    0x1(%rbp),%ebp
  jmp    L251
L65:
  mov    $0x0,%eax
  jmp    L115
L198:
  mov    %r12,%rcx
  mov    $0x1,%edx
  mov    $0x100,%esi
  mov    %rbx,%rdi
  call   <fread@plt>
  test   %eax,%eax
  setg   %al
  movzbl %al,%eax
  lea    -0x5(%rax,%rax,4),%eax
L115:
  mov    0x8(%rsp),%rdx
  sub    %fs:0x28,%rdx
  jne    L269
  add    $0x18,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L32:
  mov    $0xffffffff,%eax
  jmp    L115
L281:
  mov    $0xffffffff,%eax
  jmp    L115
L58:
  mov    $0xfffffffe,%eax
  jmp    L115
L56:
  mov    $0x0,%eax
  jmp    L115
L289:
  mov    $0xfffffffd,%eax
  jmp    L115
L207:
  mov    $0x1,%eax
  jmp    L115
L123:
  mov    $0xfffffffc,%eax
  jmp    L115
L269:
  call   <__stack_chk_fail@plt>
```

assistant: ```c
int zipcode_read_sector(FILE *zip_fd, int track, int *sector, char *buf) {
  unsigned char trk, sec, len, rep, repnum, chra;
  unsigned int i, j, count;
  size_t t1, t2;
  t1 = fread((char *)&trk, 1, 1, zip_fd);
  t2 = fread((char *)&sec, 1, 1, zip_fd);
  *sector = sec;
  if ((trk & 0x3f) != track || !t1 || !t2) {
    return -1;
  }
  if (trk & 0x80) {
    t1 = fread((char *)&len, 1, 1, zip_fd);
    t2 = fread((char *)&rep, 1, 1, zip_fd);
    if (!t1 || !t2) {
      return -2;
    }
    count = 0;
    for (i = 0; i < len; i++) {
      if ((t1 = fread((char *)&chra, 1, 1, zip_fd)) == 0) {
        return -3;
      }
      if (chra != rep) {
        buf[count++] = chra;
        continue;
      }
      t1 = fread((char *)&repnum, 1, 1, zip_fd);
      t2 = fread((char *)&chra, 1, 1, zip_fd);
      if (!t1 || !t2) {
        return 1;
      }
      i += 2;
      for (j = 0; j < repnum; j++)
        buf[count++] = chra;
    }
    return 0;
  }
  if (trk & 0x40) {
    if ((t1 = fread((char *)&chra, 1, 1, zip_fd)) == 0) {
      return -4;
    }
    for (i = 0; i < 256; i++)
      buf[i] = chra;
    return 0;
  }
  if (fread(buf, 256, 1, zip_fd) < 1) {
    return -5;
  }
  return 0;
}
```