user: 请将这段汇编代码片段转换成等效的C代码:

```asm
<main>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x28,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,0x18(%rsp)
  xor    %eax,%eax
  cmp    $0x1,%edi
  jg     L28
  lea    D19(%rip),%rsi
  lea    D31(%rip),%rdi
  call   <fopen@plt>
  mov    %rax,%r14
  test   %rax,%rax
  je     L15
  mov    $0x0,%r13d
  movl   $0x0,0xc(%rsp)
  mov    $0x0,%r12d
  lea    0x10(%rsp),%r15
  jmp    L41
L28:
  lea    D64(%rip),%rdi
  call   <printf@plt>
  mov    $0x1,%ebp
L107:
  mov    0x18(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L13
  mov    %ebp,%eax
  add    $0x28,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L15:
  lea    D42(%rip),%rdi
  call   <puts@plt>
  mov    $0x1,%ebp
  jmp    L107
L95:
  mov    %r12,%rdi
  call   <fclose@plt>
  mov    %rbx,%rdi
  call   <free@plt>
  mov    %r14,%rdi
  call   <fclose@plt>
  mov    $0x0,%ebp
  jmp    L107
L91:
  lea    0x10(%rsp),%rsi
  lea    D60(%rip),%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  mov    %r14,%rdi
  call   <fclose@plt>
  mov    %rbx,%rdi
  call   <free@plt>
  jmp    L107
L45:
  cmpl   $0x0,0xc(%rsp)
  jne    L50
L25:
  mov    %rbx,%rdi
  call   <free@plt>
L41:
  mov    $0x200,%edi
  call   <malloc@plt>
  mov    %rax,%rbx
  mov    %r14,%rcx
  mov    $0x1,%edx
  mov    $0x200,%esi
  mov    %rax,%rdi
  call   <fread@plt>
  mov    %eax,%ebp
  cmp    $0x1,%eax
  jne    L95
  mov    0x8(%rbx),%rax
  add    (%rbx),%rax
  add    0x10(%rbx),%rax
  add    0x18(%rbx),%rax
  sub    $0x3b6,%rax
  cmp    $0x1,%rax
  ja     L45
  test   %r12,%r12
  je     L56
  mov    %r12,%rdi
  call   <fclose@plt>
L56:
  mov    %r13d,%edx
  lea    D66(%rip),%rsi
  mov    %r15,%rdi
  call   <sprintf@plt>
  lea    D69(%rip),%rsi
  mov    %r15,%rdi
  call   <fopen@plt>
  mov    %rax,%r12
  test   %rax,%rax
  je     L91
  add    $0x1,%r13d
L50:
  mov    %r12,%rcx
  mov    $0x1,%edx
  mov    $0x200,%esi
  mov    %rbx,%rdi
  call   <fwrite@plt>
  mov    %ebp,0xc(%rsp)
  jmp    L25
L13:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: retrieve_data
arguments: data_tag: D19
data_type: string
name: retrieve_data
arguments: data_tag: D31
data_type: string
name: retrieve_data
arguments: data_tag: D64
data_type: string
name: retrieve_data
arguments: data_tag: D42
data_type: string
name: retrieve_data
arguments: data_tag: D60
data_type: string
name: retrieve_data
arguments: data_tag: D66
data_type: string
name: retrieve_data
arguments: data_tag: D69
data_type: string

tool: D19: r

tool: D31: card.raw

tool: D64: Usage: no command-line arguments required.

tool: D42: Could not open card.raw for reading.

tool: D60: Could not open %s for writing.


tool: D66: %03d.jpg

tool: D69: w

assistant: ```c
int main(int argc, char *argv[]) {
  if (argc > 1) {
    printf("Usage: no command-line arguments required.");
    return 1;
  }
  FILE *inptr = fopen("card.raw", "r");
  FILE *outptr = NULL;
  if (inptr == NULL) {
    printf("Could not open card.raw for reading.\n");
    return 1;
  }
  uint16_t signatureA = 0xff + 0xd8 + 0xff + 0xe0;
  uint16_t signatureB = 0xff + 0xd8 + 0xff + 0xe1;
  bool foundFirstSignature = false;
  int fnumber = 0;
  while (true) {
    uint8_t *buffer = (uint8_t *)malloc(512);
    if (fread(buffer, 512, 1, inptr) != 1) {
      fclose(outptr);
      free(buffer);
      break;
    }
    uint16_t signature = buffer[0] + buffer[1] + buffer[2] + buffer[3];
    if (signature == signatureA || signature == signatureB) {
      foundFirstSignature = true;
      if (outptr != NULL) {
        fclose(outptr);
      }
      char fname[8];
      sprintf(fname, "%03d.jpg", fnumber);
      outptr = fopen(fname, "w");
      if (outptr == NULL) {
        printf("Could not open %s for writing.\n", fname);
        fclose(inptr);
        free(buffer);
        return 1;
      }
      fnumber += 1;
    }
    if (foundFirstSignature) {
      fwrite(buffer, 512, 1, outptr);
    }
    free(buffer);
  }
  fclose(inptr);
  return 0;
}
```