user: What is the c source code of the assembly code below?

```asm
<main>:
  endbr64
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  lea    -0x40000(%rsp),%r11
L94:
  sub    $0x1000,%rsp
  orq    $0x0,(%rsp)
  cmp    %r11,%rsp
  jne    L94
  sub    $0x28,%rsp
  mov    %rsi,%rbp
  mov    %fs:0x28,%rax
  mov    %rax,0x40018(%rsp)
  xor    %eax,%eax
  cmp    $0x1,%edi
  jle    L57
L103:
  mov    0x8(%rbp),%rdi
  lea    D118(%rip),%rsi
  call   <fopen@plt>
  mov    %rax,%rbx
  test   %rax,%rax
  je     L52
L106:
  lea    0x10(%rsp),%rdi
  mov    %rbx,%rcx
  mov    $0x40000,%edx
  mov    $0x1,%esi
  call   <fread@plt>
  cmp    $0x40000,%eax
  jne    L184
L22:
  mov    %rbx,%rdi
  call   <fclose@plt>
  lea    0x18(%rsp),%rdi
  call   <Read32@plt>
  mov    %rax,%r12
  lea    0x1c(%rsp),%rdi
  call   <Read32@plt>
  mov    %rax,%rbx
  cmp    $0x2000100,%r12
  jne    L78
  mov    $0x100,%r12d
  cmp    $0x4e20,%rax
  jbe    L78
L136:
  mov    $0x40000,%eax
  sub    %r12,%rax
  cmp    %rbx,%rax
  jb     L201
  cmp    $0x9c3f,%rbx
  ja     L82
L201:
  mov    %rbx,%rsi
  lea    D83(%rip),%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  mov    $0x3,%edi
  call   <exit@plt>
L82:
  test   %rbx,%rbx
  je     L180
  lea    0x10(%rsp),%rax
  lea    (%rax,%r12,1),%rdx
  lea    (%rbx,%r12,1),%rcx
  add    %rax,%rcx
  mov    $0x0,%esi
L150:
  movzbl (%rdx),%eax
  ror    %al
  not    %eax
  movzbl %al,%eax
  add    %eax,%esi
  add    $0x1,%rdx
  cmp    %rcx,%rdx
  jne    L150
L181:
  movzwl %si,%esi
  lea    0xa(%rsp),%r13
  lea    0xc(%rsp),%rdi
  call   <Write32@plt>
  mov    %rbx,%rsi
  mov    %r13,%rdi
  call   <Write32@plt>
  mov    0x10(%rbp),%rdi
  lea    D49(%rip),%rsi
  call   <fopen@plt>
  mov    %rax,%r13
  test   %rax,%rax
  je     L48
L9:
  lea    0xa(%rsp),%rdi
  mov    %r13,%rcx
  mov    $0x6,%edx
  mov    $0x1,%esi
  call   <fwrite@plt>
  cmp    $0x6,%rax
  je     L208
L64:
  lea    D115(%rip),%rdi
  call   <puts@plt>
  mov    %r13,%rdi
  call   <fclose@plt>
  mov    $0x5,%edi
  call   <exit@plt>
L65:
  mov    %r13,%rdi
  call   <fclose@plt>
  mov    0x40018(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L0
  mov    $0x0,%eax
  add    $0x40028,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  ret
L57:
  lea    D40(%rip),%rdi
  call   <puts@plt>
  lea    D5(%rip),%rdi
  call   <puts@plt>
  lea    D15(%rip),%rdi
  call   <puts@plt>
  lea    D111(%rip),%rdi
  call   <puts@plt>
  lea    D50(%rip),%rdi
  call   <puts@plt>
  mov    $0x0,%edi
  call   <exit@plt>
  jmp    L103
L52:
  mov    0x8(%rbp),%rsi
  lea    D44(%rip),%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  mov    $0x1,%edi
  call   <exit@plt>
  jmp    L106
L184:
  mov    0x8(%rbp),%rsi
  lea    D65(%rip),%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  mov    %rbx,%rdi
  call   <fclose@plt>
  mov    $0x2,%edi
  call   <exit@plt>
  jmp    L22
L78:
  lea    0x6014(%rsp),%rdi
  call   <Read32@plt>
  mov    %rax,%rbx
  mov    $0x6020,%r12d
  jmp    L136
L180:
  mov    $0x0,%esi
  jmp    L181
L48:
  mov    0x10(%rbp),%rsi
  lea    D71(%rip),%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  mov    $0x4,%edi
  call   <exit@plt>
  jmp    L9
L208:
  lea    0x10(%rsp,%r12,1),%rdi
  mov    %r13,%rcx
  mov    %rbx,%rdx
  mov    $0x1,%esi
  call   <fwrite@plt>
  cmp    %rbx,%rax
  jne    L64
  jmp    L65
L0:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: unpack_data
arguments: data_tag: D118
type: string
name: unpack_data
arguments: data_tag: D83
type: string
name: unpack_data
arguments: data_tag: D49
type: string
name: unpack_data
arguments: data_tag: D115
type: string
name: unpack_data
arguments: data_tag: D40
type: string
name: unpack_data
arguments: data_tag: D5
type: string
name: unpack_data
arguments: data_tag: D15
type: string
name: unpack_data
arguments: data_tag: D111
type: string
name: unpack_data
arguments: data_tag: D50
type: string
name: unpack_data
arguments: data_tag: D44
type: string
name: unpack_data
arguments: data_tag: D65
type: string
name: unpack_data
arguments: data_tag: D71
type: string

tool: D118: rb

tool: D83: Error: Impossible image size %d bytes.


tool: D49: wb

tool: D115: Write error

tool: D40: Extract the software image out of an original Archos Flash ROM dump.

tool: D5: Result is a scrambled file, use the descramble tool to get the binary,

tool: D15:  always without the -fm option, even if processing an FM software.


tool: D111: Usage: extract <flash dump file> <output file>

tool: D50: Example: extract internal_rom_2000000-203FFFF.bin archos.ajz

tool: D44: Error opening input file %s


tool: D65: Error reading input file %s, must be 256kB in size.


tool: D71: Error opening output file %s


assistant: ```c
int main(int argc, char *argv[]) {
  FILE *pInFile;
  FILE *pOutFile;
  unsigned char aHeader[6];
  unsigned char aImage[256 * 1024];
  unsigned long i;
  unsigned long uiSize, uiStart;
  unsigned short usChecksum = 0;
  if (argc < 2) {
    printf("Extract the software image out of an original Archos Flash ROM dump.\n");
    printf("Result is a scrambled file, use the descramble tool to get the binary,\n");
    printf(" always without the -fm option, even if processing an FM software.\n\n");
    printf("Usage: extract <flash dump file> <output file>\n");
    printf("Example: extract internal_rom_2000000-203FFFF.bin archos.ajz\n");
    exit(0);
  }
  pInFile = fopen(argv[1], "rb");
  if (pInFile == NULL) {
    printf("Error opening input file %s\n", argv[1]);
    exit(1);
  }
  if (fread(aImage, 1, sizeof(aImage), pInFile) != sizeof(aImage)) {
    printf("Error reading input file %s, must be 256kB in size.\n", argv[1]);
    fclose(pInFile);
    exit(2);
  }
  fclose(pInFile);
  uiStart = Read32(aImage + 8);
  uiSize = Read32(aImage + 12);
  if (uiStart == 0x02000100 && uiSize > 20000) {
    uiStart = 0x0100;
  } else {
    uiStart = 0x6020;
    uiSize = Read32(aImage + 0x6000 + 4);
  }
  if (uiSize > sizeof(aImage) - uiStart || uiSize < 40000) {
    printf("Error: Impossible image size %d bytes.\n", uiSize);
    exit(3);
  }
  for (i = 0; i < uiSize; i++) {
    unsigned char byte;
    byte = aImage[uiStart + i];
    byte = ~((byte >> 1) | ((byte << 7) & 0x80));
    usChecksum += byte;
  }
  Write32(aHeader + 2, usChecksum);
  Write32(aHeader, uiSize);
  pOutFile = fopen(argv[2], "wb");
  if (pOutFile == NULL) {
    printf("Error opening output file %s\n", argv[2]);
    exit(4);
  }
  if (fwrite(aHeader, 1, sizeof(aHeader), pOutFile) != sizeof(aHeader) || fwrite(aImage + uiStart, 1, uiSize, pOutFile) != uiSize) {
    printf("Write error\n");
    fclose(pOutFile);
    exit(5);
  }
  fclose(pOutFile);
  return 0;
}
```