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
  mov    %edi,%r8d
  lea    D16(%rip),%rdi
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x818,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,0x808(%rsp)
  xor    %eax,%eax
  movb   $0x0,0x807(%rsp)
  cmp    $0x1,%r8d
  jle    L73
  mov    0x8(%rsi),%rdi
L73:
  lea    D2(%rip),%rsi
  mov    %rsp,%rbp
  call   <fopen@plt>
  mov    %rax,%r12
  cs nopw 0x0(%rax,%rax,1)
L101:
  mov    %r12,%rcx
  mov    $0x1,%edx
  mov    $0x800,%esi
  mov    %rbp,%rdi
  call   <fread@plt>
  mov    %eax,%ebx
  cmp    $0x1,%eax
  jne    L148
  cmpl   $0xff,(%rsp)
  jne    L101
  cmpl   $0xd8,0x4(%rsp)
  jne    L101
  cmpl   $0xff,0x8(%rsp)
  jne    L101
  mov    0xc(%rsp),%eax
  sub    $0xe0,%eax
  cmp    $0x1,%eax
  ja     L101
  lea    D48(%rip),%rsi
  lea    D6(%rip),%rdi
  call   <fopen@plt>
  mov    $0x1,%edx
  mov    $0x800,%esi
  mov    %rbp,%rdi
  mov    %rax,%rcx
  mov    %rax,%r13
  call   <fwrite@plt>
  jmp    L149
L148:
  xor    %ebx,%ebx
L149:
  lea    0x800(%rsp),%r14
  lea    D0(%rip),%r15
  jmp    L108
  nopw   0x0(%rax,%rax,1)
L123:
  mov    %r13,%rcx
  mov    $0x1,%edx
  mov    $0x800,%esi
  mov    %rbp,%rdi
  call   <fwrite@plt>
L108:
  mov    %r12,%rcx
  mov    $0x1,%edx
  mov    $0x800,%esi
  mov    %rbp,%rdi
  call   <fread@plt>
  cmp    $0x1,%eax
  jne    L5
  cmpl   $0xff,(%rsp)
  jne    L123
  cmpl   $0xd8,0x4(%rsp)
  jne    L123
  cmpl   $0xff,0x8(%rsp)
  jne    L123
  mov    0xc(%rsp),%eax
  sub    $0xe0,%eax
  cmp    $0x1,%eax
  ja     L123
  mov    %r13,%rdi
  call   <fclose@plt>
  mov    %ebx,%edx
  mov    %r15,%rsi
  mov    %r14,%rdi
  call   <sprintf@plt>
  lea    D48(%rip),%rsi
  mov    %r14,%rdi
  add    $0x1,%ebx
  call   <fopen@plt>
  mov    %rax,%r13
  jmp    L123
  nopl   0x0(%rax)
L5:
  mov    %r12,%rdi
  call   <fclose@plt>
  mov    0x808(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L68
  add    $0x818,%rsp
  xor    %eax,%eax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L68:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: unpack_data
arguments: tag: D16
type: string
name: unpack_data
arguments: tag: D2
type: string
name: unpack_data
arguments: tag: D48
type: string
name: unpack_data
arguments: tag: D6
type: string
name: unpack_data
arguments: tag: D0
type: string

tool: D16: card.raw

tool: D2: r

tool: D48: w

tool: D6: 000.jpg

tool: D0: %.3d.jpg

assistant: ```c
int main(int argc, char *argv[]) {
  uint8_t block[512];
  char *filename;
  FILE *rawfile;
  FILE *picfile;
  int picnum = 0;
  char picname[8];
  picname[7] = '\0';
  if (argc > 1)
    filename = argv[1];
  else
    filename = "card.raw";
  rawfile = fopen(filename, "r");
  while (picnum == 0 && fread(&block, sizeof(block), 1, rawfile) == 1) {
    if (block[0] == 0xff && block[1] == 0xd8 && block[2] == 0xff && (block[3] == 0xe0 || block[3] == 0xe1)) {
      picfile = fopen("000.jpg", "w");
      picnum++;
      fwrite(&block, sizeof(block), 1, picfile);
    }
  }
  while (fread(&block, sizeof(block), 1, rawfile) == 1) {
    if (block[0] == 0xff && block[1] == 0xd8 && block[2] == 0xff && (block[3] == 0xe0 || block[3] == 0xe1)) {
      fclose(picfile);
      sprintf(picname, "%.3d.jpg", picnum);
      picfile = fopen(picname, "w");
      picnum++;
    }
    fwrite(&block, sizeof(block), 1, picfile);
  }
  fclose(rawfile);
  return 0;
}
```