user: 请将这段汇编代码片段转换成等效的C代码:

```asm
<main>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x840,%rsp
  mov    %edi,-0x834(%rbp)
  mov    %rsi,-0x840(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
  movl   $0xffffffff,-0x824(%rbp)
  movq   $0x0,-0x820(%rbp)
  lea    D58(%rip),%rax
  mov    %rax,%rsi
  lea    D48(%rip),%rax
  mov    %rax,%rdi
  call   <fopen@plt>
  mov    %rax,-0x818(%rbp)
  cmpq   $0x0,-0x818(%rbp)
  jne    L87
  lea    D27(%rip),%rax
  mov    %rax,%rdi
  call   <puts@plt>
  mov    $0x1,%eax
  jmp    L68
L110:
  mov    -0x810(%rbp),%eax
  cmp    $0xff,%eax
  jne    L28
  mov    -0x80c(%rbp),%eax
  cmp    $0xd8,%eax
  jne    L28
  mov    -0x808(%rbp),%eax
  cmp    $0xff,%eax
  jne    L28
  mov    -0x804(%rbp),%eax
  cmp    $0xe0,%eax
  je     L56
  mov    -0x804(%rbp),%eax
  cmp    $0xe1,%eax
  jne    L28
L56:
  cmpq   $0x0,-0x820(%rbp)
  je     L97
  mov    -0x820(%rbp),%rax
  mov    %rax,%rdi
  call   <fclose@plt>
L97:
  addl   $0x1,-0x824(%rbp)
  mov    -0x824(%rbp),%edx
  lea    -0x10(%rbp),%rax
  lea    D59(%rip),%rcx
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <sprintf@plt>
  lea    -0x10(%rbp),%rax
  lea    D47(%rip),%rdx
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <fopen@plt>
  mov    %rax,-0x820(%rbp)
  cmpq   $0x0,-0x820(%rbp)
  jne    L28
  lea    -0x10(%rbp),%rax
  mov    %rax,%rsi
  lea    D9(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  jmp    L23
L28:
  cmpq   $0x0,-0x820(%rbp)
  je     L87
  mov    -0x820(%rbp),%rdx
  lea    -0x810(%rbp),%rax
  mov    %rdx,%rcx
  mov    $0x1,%edx
  mov    $0x800,%esi
  mov    %rax,%rdi
  call   <fwrite@plt>
L87:
  mov    -0x818(%rbp),%rdx
  lea    -0x810(%rbp),%rax
  mov    %rdx,%rcx
  mov    $0x1,%edx
  mov    $0x800,%esi
  mov    %rax,%rdi
  call   <fread@plt>
  test   %rax,%rax
  jne    L110
L23:
  mov    -0x820(%rbp),%rax
  mov    %rax,%rdi
  call   <fclose@plt>
  mov    -0x818(%rbp),%rax
  mov    %rax,%rdi
  call   <fclose@plt>
  mov    $0x0,%eax
L68:
  mov    -0x8(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L59
  call   <__stack_chk_fail@plt>
L59:
  leave
  ret
```

tool_calls: name: unpack_data
arguments: data_tag: D58
type: string
name: unpack_data
arguments: data_tag: D48
type: string
name: unpack_data
arguments: data_tag: D27
type: string
name: unpack_data
arguments: data_tag: D59
type: string
name: unpack_data
arguments: data_tag: D47
type: string
name: unpack_data
arguments: data_tag: D9
type: string

tool: D58: r

tool: D48: card.raw

tool: D27: Could not open file!

tool: D59: %03d.jpg

tool: D47: w

tool: D9: Couldn't open output file %s!


assistant: ```c
int main(int argc, char *argv[]) {
  int filenum = -1;
  char filename[8];
  FILE *output = NULL;
  FILE *input = fopen("card.raw", "r");
  if (input == NULL) {
    printf("Could not open file!\n");
    return 1;
  }
  uint8_t buffer[512];
  while ((fread(&buffer, sizeof(buffer), 1, input)) != 0) {
    if ((buffer[0] == 0xFF) && (buffer[1] == 0xD8) && (buffer[2] == 0xFF) && ((buffer[3] == 0xE0) || (buffer[3] == 0xE1))) {
      if (output != NULL) {
        fclose(output);
      }
      filenum++;
      sprintf(filename, "%03d.jpg", filenum);
      output = fopen(filename, "w");
      if (output == NULL) {
        printf("Couldn't open output file %s!\n", filename);
        break;
      }
    }
    if (output != NULL) {
      fwrite(&buffer, sizeof(buffer), 1, output);
    }
  }
  fclose(output);
  fclose(input);
  return 0;
}
```