user: Demonstrate the C code that generates the assembly output below:

```asm
<file_transfer>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x60,%rsp
  mov    %edi,-0x44(%rbp)
  mov    %esi,-0x48(%rbp)
  mov    %rdx,-0x50(%rbp)
  mov    %ecx,-0x54(%rbp)
  mov    -0x50(%rbp),%rax
  mov    (%rax),%rax
  mov    %rax,-0x10(%rbp)
  movl   $0x1000000,-0x24(%rbp)
  mov    -0x24(%rbp),%eax
  mov    %eax,%edi
  call   <malloc@plt>
  mov    %rax,-0x8(%rbp)
  movl   $0x0,-0x34(%rbp)
  movq   $0x0,-0x18(%rbp)
  jmp    L32
L135:
  mov    -0x10(%rbp),%rax
  mov    %eax,%edx
  mov    -0x18(%rbp),%rax
  mov    %eax,%ecx
  mov    %edx,%eax
  sub    %ecx,%eax
  mov    %eax,-0x30(%rbp)
  mov    -0x30(%rbp),%eax
  cmp    -0x24(%rbp),%eax
  jle    L83
  mov    -0x24(%rbp),%eax
  mov    %eax,-0x30(%rbp)
L83:
  cmpl   $0x0,-0x34(%rbp)
  jne    L66
  movl   $0x0,-0x2c(%rbp)
  jmp    L164
L140:
  mov    -0x30(%rbp),%eax
  sub    -0x2c(%rbp),%eax
  mov    %eax,%edx
  mov    -0x2c(%rbp),%eax
  movslq %eax,%rcx
  mov    -0x8(%rbp),%rax
  add    %rax,%rcx
  mov    -0x44(%rbp),%eax
  mov    %rcx,%rsi
  mov    %eax,%edi
  call   <read@plt>
  mov    %eax,-0x20(%rbp)
  cmpl   $0x0,-0x20(%rbp)
  jne    L9
  movl   $0x1,-0x34(%rbp)
  jmp    L176
L9:
  cmpl   $0x0,-0x20(%rbp)
  jns    L56
  mov    -0x8(%rbp),%rax
  mov    %rax,%rdi
  call   <free@plt>
  mov    $0xffffffff,%eax
  jmp    L95
L56:
  mov    -0x20(%rbp),%eax
  add    %eax,-0x2c(%rbp)
L164:
  mov    -0x2c(%rbp),%eax
  cmp    -0x30(%rbp),%eax
  jl     L140
L176:
  mov    -0x2c(%rbp),%eax
  mov    %eax,-0x30(%rbp)
  jmp    L27
L66:
  cmpl   $0x0,-0x54(%rbp)
  je     L59
  mov    -0x30(%rbp),%edx
  mov    -0x8(%rbp),%rax
  mov    $0x0,%esi
  mov    %rax,%rdi
  call   <memset@plt>
  jmp    L27
L59:
  mov    -0x8(%rbp),%rax
  mov    %rax,%rdi
  call   <free@plt>
  mov    $0xffffffff,%eax
  jmp    L95
L27:
  movl   $0x0,-0x28(%rbp)
  jmp    L134
L97:
  mov    -0x30(%rbp),%eax
  sub    -0x28(%rbp),%eax
  mov    %eax,%edx
  mov    -0x28(%rbp),%eax
  movslq %eax,%rcx
  mov    -0x8(%rbp),%rax
  add    %rax,%rcx
  mov    -0x48(%rbp),%eax
  mov    %rcx,%rsi
  mov    %eax,%edi
  call   <write@plt>
  mov    %eax,-0x1c(%rbp)
  cmpl   $0x0,-0x1c(%rbp)
  jg     L168
  mov    -0x8(%rbp),%rax
  mov    %rax,%rdi
  call   <free@plt>
  mov    $0xffffffff,%eax
  jmp    L95
L168:
  mov    -0x1c(%rbp),%eax
  add    %eax,-0x28(%rbp)
L134:
  mov    -0x28(%rbp),%eax
  cmp    -0x30(%rbp),%eax
  jl     L97
  mov    -0x30(%rbp),%eax
  cltq
  add    %rax,-0x18(%rbp)
L32:
  mov    -0x18(%rbp),%rax
  cmp    -0x10(%rbp),%rax
  jl     L135
  mov    -0x8(%rbp),%rax
  mov    %rax,%rdi
  call   <free@plt>
  mov    $0x0,%eax
L95:
  leave
  ret
```

assistant: ```c
int file_transfer(int infd, int outfd, uint64_t *s, int zero_fill) {
  uint64_t size = *s;
  int buffer_sz = 0x1000000;
  char *buffer = malloc(buffer_sz);
  int read_EOF = 0;
  uint64_t transferred = 0;
  while (transferred < size) {
    int remaining = size - transferred;
    if (remaining > buffer_sz)
      remaining = buffer_sz;
    if (!read_EOF) {
      int r = 0;
      while (r < remaining) {
        int res = read(infd, buffer + r, remaining - r);
        if (res == 0) {
          read_EOF = 1;
          break;
        }
        if (res < 0) {
          free(buffer);
          return -1;
        }
        r += res;
      }
      remaining = r;
    } else {
      if (zero_fill) {
        memset(buffer, 0, remaining);
      } else {
        free(buffer);
        return -1;
      }
    }
    int w = 0;
    while (w < remaining) {
      int res = write(outfd, buffer + w, remaining - w);
      if (res <= 0) {
        free(buffer);
        return -1;
      }
      w += res;
    }
    transferred += remaining;
  }
  free(buffer);
  return 0;
}
```