text: /***************************************************************************
   *             __________               __   ___.
   *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   *                     \/            \/     \/    \/            \/
   * $Id$
   *
   * Copyright (C) 2012 Amaury Pouly
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public License
   * as published by the Free Software Foundation; either version 2
   * of the License, or (at your option) any later version.
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
   * KIND, either express or implied.
   *
   ****************************************************************************/
  #include <stdio.h>
  #include <stdint.h>
  #include <stdbool.h>
  #include <stdlib.h>
  #include <string.h>
  #include <getopt.h>
  #include <stdarg.h>
  #include <ctype.h>
  #include "misc.h"
  #include "elf.h"
  #include <sys/stat.h>
  
  #ifndef MIN
  #define MIN(a,b) ((a) < (b) ? (a) : (b))
  #endif
  
  #define cprintf(col, ...) do {color(col); printf(__VA_ARGS__); }while(0)
  
  #define cprintf_field(str1, ...) do{ cprintf(GREEN, str1); cprintf(YELLOW, __VA_ARGS__); }while(0)
  
  bool g_debug = false;
  char *g_out_prefix = NULL;
  char *g_in_file = NULL;
  bool g_force = false;
  
  #define let_the_force_flow(x) do { if(!g_force) return x; } while(0)
  #define continue_the_force(x) if(x) let_the_force_flow(x)
  
  #define check_field(v_exp, v_have, str_ok, str_bad) \
      if((v_exp) != (v_have)) \
      { cprintf(RED, str_bad); let_the_force_flow(__LINE__); } \
      else { cprintf(RED, str_ok); }
  
  static void print_hex(void *p, int size, int unit)
  {
      uint8_t *p8 = p;
      uint16_t *p16 = p;
      uint32_t *p32 = p;
      for(int i = 0; i < size; i += unit, p8++, p16++, p32++)
      {
          if(i != 0 && (i % 16) == 0)
              printf("\n");
          if(unit == 1)
              printf(" %02x", *p8);
          else if(unit == 2)
              printf(" %04x", *p16);
          else
              printf(" %08x", *p32);
      }
  }
  
  /**
   * FWU
   **/
  
  #define FWU_SIG_SIZE    16
  #define FWU_BLOCK_SIZE  512
  
  struct fwu_hdr_t
  {
      uint8_t sig[FWU_SIG_SIZE];
      uint32_t fw_size;
      uint32_t block_size;// always 512
      uint8_t version;
      uint8_t unk;
      uint8_t sig2[FWU_SIG_SIZE];
  } __attribute__((packed));
  
  const uint8_t g_fwu_signature[FWU_SIG_SIZE] =
  {
      0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff, 0x75
  };
  
  struct version_desc_t
  {
      uint8_t version;
      uint8_t value;
      uint8_t unk;
      uint8_t sig2[FWU_SIG_SIZE];
  };
  
  struct version_desc_t g_version[] =
  {
      { 1, 0xd, 0xd0, { 0x76, 0x5c, 0x50, 0x94, 0x69, 0xb0, 0xa7, 0x03, 0x10, 0xf1, 0x7e, 0xdb, 0x88, 0x90, 0x86, 0x9d } },
      { 1, 0xe, 0xd0, { 0x92, 0x22, 0x7a, 0x77, 0x08, 0x67, 0xae, 0x06, 0x16, 0x06, 0xb8, 0x65, 0xa6, 0x42, 0xf7, 0X52 } },
      { 3, 0x7e, 0xe1, { 0x3f, 0xad, 0xf8, 0xb0, 0x2e, 0xaf, 0x67, 0x49, 0xb9, 0x85, 0x5f, 0x63, 0x4e, 0x5e, 0x8e, 0x2e } },
  };
  
  #define NR_VERSIONS (int)(sizeof(g_version)/sizeof(g_version[0]))
  
  typedef struct ptr_bundle_t
  {
      uint32_t *ptrA;
      uint32_t *ptrB;
  }ptr_bundle_t;
  
  struct block_A_info_t
  {
      int nr_bits;
      uint16_t field_2;
      int nr_words;
      int nr_dwords_x12;
      uint32_t *ptr6; // size
      uint32_t *ptr7; // size
      uint32_t *ptr5; // size
      uint32_t size;
      uint32_t field_1C;
      ptr_bundle_t ptr1;
      uint32_t *ptr3; // size
      uint32_t *ptr4; //  size
      int nr_words2;
      uint32_t field_34;
      int nr_dwords_x8;
      int nr_bytes;
      int nr_bytes2;
      int nr_dwords_m1;
      int nr_dwords_x2_m1;
      int nr_dwords_x2;
      int nr_dwords;
      uint32_t field_54;
      uint32_t field_58;
  };
  
  struct block_A_info_t g_decode_A_info;
  uint8_t g_subblock_A[0x128];
  uint8_t g_key_B[20];
  uint8_t g_perm_B[258];
  uint8_t g_crypto_info_byte;
  uint8_t *g_decode_buffer;
  uint8_t *g_decode_buffer2;
  void *g_decode_buffer3;
  
  #include "atj_tables.h"
  
  void compute_checksum(uint8_t *buf, int size, uint8_t t[20])
  {
      memset(t, 0, 20);
  
      for(int i = 0; i < size; i++)
          t[i % 20] ^= buf[i];
      for(int i = 0; i < 20; i++)
          t[i] = ~t[i];
  }
  
  int check_block(uint8_t *buf, uint8_t ref[20], unsigned size)
  {
      uint8_t t[20];
      compute_checksum(buf, size, t);
  
      return memcmp(ref, t, 20);
  }
  
  
  int get_version(uint8_t *buf, unsigned long size)
  {
      (void) size;
      struct fwu_hdr_t *hdr = (void *)buf;
      for(int i = 0; i < NR_VERSIONS; i++)
          if(hdr->version == g_version[i].value)
              return i;
      return -1;
  }
  
  static int decode_block_A(uint8_t block[1020])
  {
      uint8_t *p = &g_check_block_A_table[32 * (block[998] & 0x1f)];
      uint8_t key[32];
  
      for(int i = 0; i < 20; i++)
      {
          block[1000 + i] ^= p[i];
          key[i] = block[1000 + i];
      }
      for(int i = 20; i < 32; i++)
          key[i] = key[i - 20];
      
      for(int i = 0; i < 992; i++)
          block[i] ^= key[i % 32] ^ g_check_block_A_table[i];
      
      return check_block(block - 1, block + 1000, 1001);
  }
  
  static void compute_perm(uint8_t *keybuf, int size, uint8_t perm[258])
  {
      for(int i = 0; i < 256; i++)
          perm[i] = i;
      perm[256] = perm[257] = 0;
      uint8_t idx = 0;
      for(int i = 0; i < 256; i++)
      {
          uint8_t v = perm[i];
          idx = (v + keybuf[i % size] + idx) % 256;
          perm[i] = perm[idx];
          perm[idx] = v;
      }
  }
  
  static void decode_perm(uint8_t *buf, int size, uint8_t perm[258])
  {
      uint8_t idxa = perm[256];
      uint8_t idxb = perm[257];
      for(int i = 0; i < size; i++)
      {
          idxa = (idxa + 1) % 256;
          uint8_t v = perm[idxa];
          idxb = (idxb + v) % 256;
          perm[idxa] = perm[idxb];
          perm[idxb] = v;
          buf[i] ^= perm[(v + perm[idxa]) % 256];
      }
  }
  
  static void decode_block_with_perm(uint8_t *keybuf, int keysize,
      uint8_t *buf, int bufsize, uint8_t perm[258])
  {
      compute_perm(keybuf, keysize, perm);
      decode_perm(buf, bufsize, perm);
  }
  
  static void apply_perm(uint8_t *inbuf, uint8_t *outbuf, int size, int swap)
  {
      memcpy(outbuf, inbuf, size);
      int a = swap & 0xf;
      int b = (swap >> 4) + 16;
      uint8_t v = outbuf[a];
      outbuf[a] = outbuf[b];
      outbuf[b] = v;
  }
  
  static void decode_block_with_swap(uint8_t keybuf[32], int swap,
      uint8_t *buf, int bufsize, uint8_t perm[258])
  {
      uint8_t keybuf_interm[32];
  
      apply_perm(keybuf, keybuf_interm, 32, swap);
      decode_block_with_perm(keybuf_interm, 32, buf, bufsize, perm);
  }
  
  static void clear_memory(void *buf, int size_dwords)
  {
      memset(buf, 0, 4 * size_dwords);
  }
  
  static void set_bit(int bit_pos, uint32_t *buf)
  {
      buf[bit_pos / 32] |= 1 << (bit_pos % 32);
  }
  
  static int fill_decode_info(uint8_t sz)
  {
      if(sz == 2) sz = 233;
      else if(sz == 3) sz = 163;
      else return 1;
  
      g_decode_A_info.nr_bits = sz;
      g_decode_A_info.nr_bytes2 = sz / 8 + (sz % 8 != 0);
      g_decode_A_info.nr_words = 2 * g_decode_A_info.nr_bytes2;
      g_decode_A_info.nr_bytes = sz / 8 + (sz % 8 != 0);
      g_decode_A_info.nr_words2 = 2 * g_decode_A_info.nr_bytes2;
      g_decode_A_info.nr_dwords = sz / 32 + (sz % 32 != 0);
      g_decode_A_info.size = 4 * g_decode_A_info.nr_dwords;
      g_decode_A_info.nr_dwords_x8 = 8 * g_decode_A_info.nr_dwords;
      g_decode_A_info.nr_dwords_m1 = g_decode_A_info.nr_dwords - 1;
      g_decode_A_info.nr_dwords_x2 = 2 * g_decode_A_info.nr_dwords;
      g_decode_A_info.nr_dwords_x2_m1 = g_decode_A_info.nr_dwords_x2 - 1;
      g_decode_A_info.nr_dwords_x12 = 12 * g_decode_A_info.nr_dwords;
      g_decode_A_info.ptr1.ptrA = malloc(4 * g_decode_A_info.nr_dwords);
      g_decode_A_info.ptr1.ptrB = malloc(g_decode_A_info.size);
      g_decode_A_info.ptr3 = malloc(g_decode_A_info.size);
      g_decode_A_info.ptr4 = malloc(g_decode_A_info.size);
      g_decode_A_info.ptr5 = malloc(g_decode_A_info.size);
      g_decode_A_info.ptr6 = malloc(g_decode_A_info.size);
      g_decode_A_info.ptr7 = malloc(g_decode_A_info.size);
  
      cprintf(BLUE, "  Decode Info:\n");
      cprintf_field("    Nr Bits: ", "%d\n", g_decode_A_info.nr_bits);
      cprintf_field("    Nr Bytes: ", "%d\n", g_decode_A_info.nr_bytes);
      cprintf_field("    Nr Bytes 2: ", "%d\n", g_decode_A_info.nr_bytes2);
      cprintf_field("    Nr Words: ", "%d\n", g_decode_A_info.nr_words);
      cprintf_field("    Nr Words 2: ", "%d\n", g_decode_A_info.nr_words2);
      cprintf_field("    Nr DWords: ", "%d\n", g_decode_A_info.nr_dwords);
      cprintf_field("    Size: ", "%d\n", g_decode_A_info.size);
  
      return 0;
  }
  
  static int process_block_A(uint8_t block[1024])
  {
      cprintf(BLUE, "Block A\n");
      int ret = decode_block_A(block + 4);
      cprintf(GREEN, "  Check: ");
      check_field(ret, 0, "Pass\n", "Fail\n");
  
      memcpy(g_subblock_A, block, sizeof(g_subblock_A));
      ret = fill_decode_info(g_subblock_A[276]);
      cprintf(GREEN, "  Info: ");
      check_field(ret, 0, "Pass\n", "Fail\n");
  
      int tmp = 2 * g_decode_A_info.nr_bytes2 + 38;
      int offset = 1004 - tmp + 5;
      g_crypto_info_byte = block[offset - 1];
      g_decode_buffer = malloc(g_decode_A_info.size);
      g_decode_buffer2 = malloc(g_decode_A_info.size);
      
      memset(g_decode_buffer, 0, g_decode_A_info.size);
      memset(g_decode_buffer2, 0, g_decode_A_info.size);
  
      memcpy(g_decode_buffer, &block[offset], g_decode_A_info.nr_bytes2);
      int offset2 = g_decode_A_info.nr_bytes2 + offset;
      memcpy(g_decode_buffer2, &block[offset2], g_decode_A_info.nr_bytes2);
  
  
      cprintf_field("  Word: ", "%d ", *(uint16_t *)&g_subblock_A[286]);
      check_field(*(uint16_t *)&g_subblock_A[286], 1, "Ok\n", "Mismatch\n");
      
      return 0;
  }
  
  static void decode_key_B(uint8_t buf[20], uint8_t buf2[16], uint8_t key[20])
  {
      for(int i = 0; i < 20; i++)
      {
          uint8_t v = buf[i] ^ g_decode_B_table[i];
          key[i] = v;
          buf[i] = v ^ buf2[i % 16];
      }
  }
  
  static void decode_block_B(uint8_t *buf, uint8_t key[16], int size)
  {
      decode_key_B(&buf[size], key, g_key_B);
      decode_block_with_perm(g_key_B, 20, buf, size, g_perm_B);
  }
  
  static int find_last_bit_set(uint32_t *buf, bool a)
  {
      int i = a ? g_decode_A_info.nr_dwords_m1 : g_decode_A_info.nr_dwords_x2_m1;
  
      while(i >= 0 && buf[i] == 0)
          i--;
      if(i < 0)
          return -1;
      for(int j = 31; j >= 0; j--)
          if(buf[i] & (1 << j))
              return 32 * i + j;
      return -1; // unreachable
  }
  
  static void xor_with_ptrs(uint8_t *buf, ptr_bundle_t *ptrs)
  {
      /*
      int sz = g_decode_A_info.nr_bytes2 - 1;
      if(sz <= 32)
      {
          for(int i = 0; i < sz; i++)
              buf[i] ^= ptrs->ptrA[i];
          for(int i = sz; i < 32; i++)
              buf[i] ^= ptrs->ptrB[i - sz];
      }
      else
          for(int i = 0; i < 32; i++)
              buf[i] ^= ptrs->ptrA[i];
      */
      uint8_t *ptrA = (uint8_t *)ptrs->ptrA;
      uint8_t *ptrB = (uint8_t *)ptrs->ptrB;
      int sz = MIN(g_decode_A_info.nr_bytes2 - 1, 32);
      for(int i = 0; i < sz; i++)
          buf[i] ^= ptrA[i];
      for(int i = sz; i < 32; i++)
          buf[i] ^= ptrB[i - sz];
  }
  
  static void copy_memory(uint32_t *to, uint32_t *from)
  {
      for(int i = 0; i < g_decode_A_info.nr_dwords; i++)
          to[i] = from[i];
  }
  
  static void swap_memory(uint32_t *a, uint32_t *b)
  {
      for(int i = 0; i < g_decode_A_info.nr_dwords; i++)
      {
          uint32_t c = a[i];
          a[i] = b[i];
          b[i] = c;
      }
  }
  
  static void shift_left(uint32_t *buf, int nr_bits)
  {
      for(int i = g_decode_A_info.nr_dwords_m1; i >= 0; i--)
          buf[i + (nr_bits / 32)] = buf[i];
      memset(buf, 0, 4 * (nr_bits / 32));
  
      int size = g_decode_A_info.nr_dwords + (nr_bits + 31) / 32;
      nr_bits = nr_bits % 32;
  
      uint32_t acc = 0;
      for(int i = 0; i < size; i++)
      {
          uint32_t new_val = buf[i] << nr_bits | acc;
          /* WARNING if nr_bits = 0 then the right shift by 32 is undefined and so
           * the following code could break. The additional AND catches this case
           * and make sure the result is 0 */
          acc = ((1 << nr_bits) - 1) & (buf[i] >> (32 - nr_bits));
          buf[i] = new_val;
      }
  }
  
  static void xor_big(uint32_t *res, uint32_t *a, uint32_t *b)
  {
      for(int i = 0; i < g_decode_A_info.nr_dwords_x2; i++)
          res[i] = a[i] ^ b[i];
  }
  
  static void decode_with_xor(uint32_t *res, uint32_t *key)
  {
      uint32_t *tmp = malloc(g_decode_A_info.nr_dwords_x8);
      uint32_t *copy = malloc(g_decode_A_info.nr_dwords_x8);
      uint32_t *copy_arg = malloc(g_decode_A_info.nr_dwords_x8);
      uint32_t *tmp2 = malloc(g_decode_A_info.nr_dwords_x8);
      clear_memory(tmp, g_decode_A_info.nr_dwords_x2);
      clear_memory(res, g_decode_A_info.nr_dwords);
      *res = 1;
      clear_memory(tmp2, g_decode_A_info.nr_dwords);
      copy_memory(copy_arg, key);
      copy_memory(copy, (uint32_t *)g_decode_A_info.ptr5);
  
      for(int i = find_last_bit_set(copy_arg, 1); i; i = find_last_bit_set(copy_arg, 1))
      {
          int pos = i - find_last_bit_set(copy, 1);
          if(pos < 0)
          {
              swap_memory(copy_arg, copy);
              swap_memory(res, tmp2);
              pos = -pos;
          }
          copy_memory(tmp, copy);
          shift_left(tmp, pos);
          xor_big(copy_arg, copy_arg, tmp);
          copy_memory(tmp, tmp2);
          shift_left(tmp, pos);
          xor_big(res, res, tmp);
      }
      free(tmp);
      free(copy);
      free(copy_arg);
      free(tmp2);
  }
  
  static void shift_left_one(uint32_t *a)
  {
      int pos = find_last_bit_set(a, 0) / 32 + 1;
      if(pos <= 0)
          return;
      uint32_t v = 0;
      for(int i = 0; i < pos; i++)
      {
          uint32_t new_val = v | a[i] << 1;
          v = a[i] >> 31;
          a[i] = new_val;
      }
      if(v)
          a[pos] = v;
  }
  
  
  #if 1
  static void xor_mult(uint32_t *a1, uint32_t *a2, uint32_t *a3)
  {
      uint32_t *tmp2 = malloc(g_decode_A_info.nr_dwords_x8);
      clear_memory(tmp2, g_decode_A_info.nr_dwords_x2);
      copy_memory(tmp2, a3);
  
      int pos = g_decode_A_info.nr_dwords;
      uint32_t mask = 1;
      for(int i = 0; i < 32; i++)
      {
          for(int j = 0; j < g_decode_A_info.nr_dwords; j++)
          {
              if(a2[j] & mask)
                  for(int k = 0; k < pos; k++)
                      a1[j + k] ^= tmp2[k];
          }
          shift_left_one(tmp2);
          mask <<= 1;
          pos = find_last_bit_set(tmp2, 0) / 32 + 1;
      }
      free(tmp2);
  }
  #else
  static void xor_mult(uint32_t *a1, uint32_t *a2, uint32_t *a3)
  {
      for(int i = 0; i < 32 * g_decode_A_info.nr_dwords; i++)
          for(int j = 0; j < 32 * g_decode_A_info.nr_dwords; j++)
          {
              int k = i + j;
              uint32_t v1 = (a2[i / 32] >> (i % 32)) & 1;
              uint32_t v2 = (a3[j / 32] >> (j % 32)) & 1;
              a1[k / 32] ^= (v1 * v2) << (k % 32);
          }
  }
  #endif
  
  static int compare(uint32_t *a, uint32_t *b)
  {
      return memcmp(a, b, g_decode_A_info.nr_dwords * 4);
  }
  
  static void xor_mult_high(uint32_t *a1, uint32_t *buf, uint32_t *a3)
  {
      (void) a1;
      uint32_t *tmp = malloc(g_decode_A_info.nr_dwords_x8);
      int v4 = g_decode_A_info.field_34;
      int pos = find_last_bit_set(buf, 0);
      for(int i = pos - v4; i >= 0; i = find_last_bit_set(buf, 0) - v4)
      {
          clear_memory(tmp, g_decode_A_info.nr_dwords_x2);
          copy_memory(tmp, a3);
          shift_left(tmp, i);
          xor_big(buf, buf, tmp);
      }
      free(tmp);
  }
  
  static void xor_small(uint32_t *res, uint32_t *a, uint32_t *b)
  {
      for(int i = 0; i < g_decode_A_info.nr_dwords; i++)
          res[i] = a[i] ^ b[i];
  }
  
  static void crypto(ptr_bundle_t *a1, ptr_bundle_t *a2)
  {
      uint32_t *v2 = malloc(g_decode_A_info.nr_dwords_x8);
      uint32_t *v3 = malloc(g_decode_A_info.nr_dwords_x8);
      uint32_t *v4 = malloc(g_decode_A_info.nr_dwords_x8);
      uint32_t *v5 = malloc(g_decode_A_info.nr_dwords_x8);
      uint32_t *v6 = malloc(g_decode_A_info.nr_dwords_x8);
      clear_memory(a2->ptrA, g_decode_A_info.nr_dwords);
      clear_memory(a2->ptrB, g_decode_A_info.nr_dwords);
      clear_memory(v3, g_decode_A_info.nr_dwords_x2);
      clear_memory(v6, g_decode_A_info.nr_dwords_x2);
      clear_memory(v4, g_decode_A_info.nr_dwords_x2);
      decode_with_xor(v4, a1->ptrA);
      clear_memory(v5, g_decode_A_info.nr_dwords_x2);
  
      xor_mult(v5, v4, a1->ptrB);
      xor_mult_high(v5, v5, g_decode_A_info.ptr5);
      xor_small(v2, a1->ptrA, v5);
      xor_small(v4, v2, g_decode_A_info.ptr6);
      clear_memory(v3, g_decode_A_info.nr_dwords_x2);
      xor_mult(v3, v2, v2);
      xor_mult_high(v3, v3, g_decode_A_info.ptr5);
      xor_small(a2->ptrA, v4, v3);
      clear_memory(v5, g_decode_A_info.nr_dwords_x2);
      xor_small(v4, v2, g_xor_key);
      xor_mult(v5, v4, a2->ptrA);
      xor_mult_high(v5, v5, g_decode_A_info.ptr5);
      clear_memory(v6, g_decode_A_info.nr_dwords_x2);
      xor_mult(v6, a1->ptrA, a1->ptrA);
      xor_mult_high(v6, v6, g_decode_A_info.ptr5);
      xor_small(a2->ptrB, v5, v6);
      free(v2);
      free(v3);
      free(v4);
      free(v5);
      free(v6);
  }
  
  static void crypto2(ptr_bundle_t *a1, ptr_bundle_t *a2, ptr_bundle_t *a3)
  {
      uint32_t *v3 = malloc(g_decode_A_info.nr_dwords_x8);
      uint32_t *v4 = malloc(g_decode_A_info.nr_dwords_x8);
      uint32_t *v5 = malloc(g_decode_A_info.nr_dwords_x8);
      uint32_t *v6 = malloc(g_decode_A_info.nr_dwords_x8);
      uint32_t *v7 = malloc(g_decode_A_info.nr_dwords_x8);
      clear_memory(a3->ptrA, g_decode_A_info.nr_dwords);
      clear_memory(a3->ptrB, g_decode_A_info.nr_dwords);
      clear_memory(v4, g_decode_A_info.nr_dwords_x2);
      clear_memory(v7, g_decode_A_info.nr_dwords_x2);
      xor_small(v5, a1->ptrB, a2->ptrB);
      xor_small(v6, a1->ptrA, a2->ptrA);
      decode_with_xor(v7, v6);
      clear_memory(v3, g_decode_A_info.nr_dwords_x2);
      xor_mult(v3, v7, v5);
      xor_mult_high(v3, v3, g_decode_A_info.ptr5);
      xor_small(v5, v3, g_decode_A_info.ptr6);
      clear_memory(v4, g_decode_A_info.nr_dwords_x2);
      xor_mult(v4, v3, v3);
      xor_mult_high(v4, v4, g_decode_A_info.ptr5);
      xor_small(v7, v5, v4);
      xor_small(a3->ptrA, v7, v6);
      xor_small(v5, a1->ptrA, a3->ptrA);
      xor_small(v6, a3->ptrA, a1->ptrB);
      clear_memory(v7, g_decode_A_info.nr_dwords_x2);
      xor_mult(v7, v5, v3);
      xor_mult_high(v7, v7, g_decode_A_info.ptr5);
      xor_small(a3->ptrB, v7, v6);
      free(v3);
      free(v4);
      free(v5);
      free(v6);
      free(v7);
  }
  
  static int crypto3(uint32_t *a1, ptr_bundle_t *ptrs_alt, ptr_bundle_t *ptrs)
  {
      ptr_bundle_t ptrs_others;
  
      ptrs_others.ptrA = malloc(g_decode_A_info.size);
      ptrs_others.ptrB = malloc(g_decode_A_info.size);
      clear_memory(ptrs->ptrA, g_decode_A_info.nr_dwords);
      clear_memory(ptrs->ptrB, g_decode_A_info.nr_dwords);
      clear_memory(ptrs_others.ptrA, g_decode_A_info.nr_dwords);
      clear_memory(ptrs_others.ptrB, g_decode_A_info.nr_dwords);
      int pos = find_last_bit_set(a1, 1);
      
      copy_memory(ptrs_others.ptrA, ptrs_alt->ptrA);
      copy_memory(ptrs_others.ptrB, ptrs_alt->ptrB);
      for(int bit = (pos % 32) - 1; bit >= 0; bit--)
      {
          crypto(&ptrs_others, ptrs);
          copy_memory(ptrs_others.ptrA, ptrs->ptrA);
          copy_memory(ptrs_others.ptrB, ptrs->ptrB);
          if(a1[pos / 32] & (1 << bit))
          {
              crypto2(&ptrs_others, ptrs_alt, ptrs);
              copy_memory(ptrs_others.ptrA, ptrs->ptrA);
              copy_memory(ptrs_others.ptrB, ptrs->ptrB);
          }
      }
      for(int i = pos / 32 - 1; i >= 0; i--)
      {
          for(int bit = 31; bit >= 0; bit--)
          {
              crypto(&ptrs_others, ptrs);
              copy_memory(ptrs_others.ptrA, ptrs->ptrA);
              copy_memory(ptrs_others.ptrB, ptrs->ptrB);
              if(a1[i] & (1 << bit))
              {
                  crypto2(&ptrs_others, ptrs_alt, ptrs);
                  copy_memory(ptrs_others.ptrA, ptrs->ptrA);
                  copy_memory(ptrs_others.ptrB, ptrs->ptrB);
              }
          }
      }
      copy_memory(ptrs->ptrA, ptrs_others.ptrA);
      copy_memory(ptrs->ptrB, ptrs_others.ptrB);
      free(ptrs_others.ptrA);
      free(ptrs_others.ptrB);
      return 0;
  }
  
  static int crypto4(uint8_t *a1, ptr_bundle_t *ptrs, uint32_t *a3)
  {
      ptr_bundle_t ptrs_others;
      
      ptrs_others.ptrA = malloc(g_decode_A_info.size);
      ptrs_others.ptrB = malloc(g_decode_A_info.size);
      clear_memory(ptrs_others.ptrA, g_decode_A_info.nr_dwords);
      clear_memory(ptrs_others.ptrB, g_decode_A_info.nr_dwords);
      int ret = crypto3(a3, ptrs, &ptrs_others);
      if(ret == 0)
          xor_with_ptrs(a1, &ptrs_others);
      free(ptrs_others.ptrA);
      free(ptrs_others.ptrB);
      return ret;
  }
  
  static int crypto_bits(uint32_t *buf, int a2)
  {
      clear_memory(buf, g_decode_A_info.nr_dwords);
      g_decode_A_info.field_34 = 0;
      if(a2 == 4)
      {
          set_bit(0, buf);
          set_bit(74, buf);
          set_bit(233, buf);
          g_decode_A_info.field_34 = 233;
          return 0;
      }
      else if (a2 == 5)
      {
          set_bit(0, buf);
          set_bit(3, buf);
          set_bit(6, buf);
          set_bit(7, buf);
          set_bit(163, buf);
          g_decode_A_info.field_34 = 163;
          return 0;
      }
      else
          return 1;
  }
  
  static int crypto_bits_copy(ptr_bundle_t *a1, char a2)
  {
      int ret = crypto_bits(g_decode_A_info.ptr5, a2);
      if(ret) return ret;
      if(a2 == 4)
      {
          copy_memory(a1->ptrA, g_crypto_table);
          copy_memory(a1->ptrB, g_crypto_table2);
          copy_memory(g_decode_A_info.ptr6, g_crypto_data);
          copy_memory(g_decode_A_info.ptr7, g_crypto_key6);
          return 0;
      }
      else if ( a2 == 5 )
      {
          copy_memory(a1->ptrA, g_crypto_key3);
          copy_memory(a1->ptrB, g_crypto_key4);
          copy_memory(g_decode_A_info.ptr6, g_crypto_data3);
          copy_memory(g_decode_A_info.ptr7, g_crypto_key5);
          return 0;
      }
      else
          return 1;
  }
  
  static void create_guid(void *uid, int bit_size)
  {
      uint8_t *p = uid;
      for(int i = 0; i < bit_size / 8; i++)
          p[i] = rand() % 256;
  }
  
  static int process_block_B(uint8_t block[512])
  {
      cprintf(BLUE, "Block B\n");
      decode_block_B(block + 3, g_subblock_A + 4, 489);
      cprintf_field("  Word: ", "%d ", *(uint16_t *)(block + 3));
      check_field(*(uint16_t *)(block + 3), 1, "Ok\n", "Mismatch\n");
  
      int ret = check_block(block, block + 492, 492);
      cprintf(GREEN, "  Check: ");
      check_field(ret, 0, "Pass\n", "Fail\n");
  
      g_decode_buffer3 = malloc(g_decode_A_info.size);
      memset(g_decode_buffer3, 0, g_decode_A_info.size);
      int offset = *(uint16_t *)(block + 13) + 16;
      memcpy(g_decode_buffer3, &block[offset], g_decode_A_info.nr_bytes2);
  
      return 0;
  }
  
  static int do_fwu_v3(int size, uint8_t *buf, uint8_t *blockA, uint8_t *blockB,
      uint8_t *unk, uint8_t *unk2, uint8_t *blo)
  {
      (void) size;
      uint8_t smallblock[512];
      uint8_t bigblock[1024];
  
      memset(smallblock, 0, sizeof(smallblock));
      memset(bigblock, 0, sizeof(bigblock));
      
      uint8_t ba = buf[0x1ee] & 0xf;
      uint8_t bb = buf[0x1fe] & 0xf;
      
      cprintf_field("  Block A: ", "%d\n", ba + 2);
      cprintf("  Block B: ", "%d\n", ba + bb + 5);
      
      *blockA = buf[494] & 0xf;
      *blockB = buf[510] & 0xf;
      memcpy(bigblock, &buf[512 * (*blockA + 2)], sizeof(bigblock));
  
      int ret = process_block_A(bigblock);
      continue_the_force(ret);
      
      memcpy(smallblock, &buf[512 * (*blockA + *blockB + 5)], sizeof(smallblock));
      ret = process_block_B(smallblock);
      continue_the_force(ret);
  
      cprintf(BLUE, "Main\n");
  
      // WARNING you need more that 48 because 17+32 > 48 !! (see code below) */
      uint8_t smallbuf[50];
      memcpy(smallbuf, buf + 42, sizeof(smallbuf));
      cprintf_field("  Byte: ", "%d ", smallbuf[16]);
      check_field(smallbuf[16], 3, "Ok\n", "Mismatch\n");
  
      ptr_bundle_t ptrs;
      ptrs.ptrA = malloc(g_decode_A_info.size);
      ptrs.ptrB = malloc(g_decode_A_info.size);
      memset(ptrs.ptrA, 0, g_decode_A_info.size);
      memset(ptrs.ptrB, 0, g_decode_A_info.size);
      memcpy(ptrs.ptrA, buf + 91, g_decode_A_info.nr_bytes2);
      memcpy(ptrs.ptrB, buf + 91 + g_decode_A_info.nr_bytes2, g_decode_A_info.nr_bytes2);
  
      ret = crypto_bits_copy(&g_decode_A_info.ptr1, g_crypto_info_byte);
      cprintf(GREEN, "  Crypto bits copy: ");
      check_field(ret, 0, "Pass\n", "Fail\n");
  
      ret = crypto4(smallbuf + 17, &ptrs, g_decode_buffer3);
      cprintf(GREEN, "  Crypto 4: ");
      check_field(ret, 0, "Pass\n", "Fail\n");
  
      memcpy(unk2, &smallbuf[17], 32);
      int offset = g_decode_A_info.nr_words + 91;
      
      decode_block_with_swap(unk2, 0, &buf[offset], 512 - offset, g_perm_B);
  
      int pos = *(uint16_t *)&buf[offset];
      cprintf_field("  Word: ", "%d ", pos);
      int tmp = g_decode_A_info.nr_words2 + 199;
      check_field(pos, 510 - tmp, "Ok\n", "Mismatch\n");
  
      uint8_t midbuf[108];
      memcpy(midbuf, &buf[pos + offset + 2], sizeof(midbuf));
  
      cprintf_field("  Byte: ", "%d ", midbuf[0]);
      check_field(midbuf[0], 2, "Ok\n", "Invalid\n");
      cprintf_field("  DWord: ", "%d ", *(uint32_t *)&midbuf[1]);
      check_field(*(uint32_t *)&midbuf[1], 2056, "Ok\n", "Invalid\n");
      cprintf_field("  DWord: ", "%d ", *(uint32_t *)&midbuf[5]);
      check_field(*(uint32_t *)&midbuf[5], 8, "Ok\n", "Invalid\n");
      cprintf_field("  Byte: ", "%d ", midbuf[41]);
      check_field(midbuf[41], 190, "Ok\n", "Invalid\n");
  
      memset(blo, 0, 512);
      create_guid(smallblock, 3808);
      memcpy(smallblock + 476, midbuf + 42, 16);
      compute_checksum(smallblock, 492, blo + 492);
      int bsz = blo[500];
      memcpy(blo, smallblock, bsz);
      memcpy(blo + bsz, midbuf + 42, 16);
      memcpy(blo + bsz + 16, smallblock + bsz, 476 - bsz);
  
      decode_block_with_perm(blo + 492, 16, blo, 492, g_perm_B);
      ret = check_block(buf + 42, midbuf + 88, 450);
      cprintf(GREEN, "  Decode block: ");
      check_field(ret, 0, "Pass\n", "Fail\n");
  
      ret = memcmp(g_subblock_A + 4, midbuf + 9, 16);
      cprintf(GREEN, "  Compare: ");
      check_field(ret, 0, "Pass\n", "Fail\n");
  
      uint8_t zero[16];
      memset(zero, 0, sizeof(zero));
      ret = memcmp(unk, zero, sizeof(zero));
      cprintf(GREEN, "  Sanity: ");
      check_field(ret, 0, "Pass\n", "Fail\n");
  
      /*
      ret = memcmp(midbuf + 25, zero, sizeof(zero));
      cprintf(GREEN, "  Sanity: ");
      check_field(ret, 0, "Pass\n", "Fail\n");
      */
  
      return 0;
  }
  
  static int do_sthg_fwu_v3(uint8_t *buf, int *size, uint8_t *unk, uint8_t *block)
  {
      uint8_t blockA;
      uint8_t blockB;
      uint8_t unk2[32];
      memset(unk2, 0, sizeof(unk2));
      int ret = do_fwu_v3(*size, buf, &blockA, &blockB, unk, unk2, block);
      continue_the_force(ret);
  
      *size -= 2048;
      uint8_t *tmpbuf = malloc(*size);
      memset(tmpbuf, 0, *size);
      int offsetA = (blockA + 1) << 9;
      int offsetB = (blockB + 1) << 9;
      memcpy(tmpbuf, buf + 512, offsetA);
      memcpy(tmpbuf + offsetA, buf + offsetA + 1536, offsetB);
      memcpy(tmpbuf + offsetA + offsetB,
          buf + offsetA + 1536 + offsetB + 512, *size - offsetA - offsetB);
      compute_perm(unk2, 32, g_perm_B);
      decode_perm(tmpbuf, *size, g_perm_B);
      memcpy(buf, tmpbuf, *size);
  
      return 0;
  }
  
  /* [add]: string to add when there is no extension
   * [replace]: string to replace extension */
  static void build_out_prefix(char *add, char *replace, bool slash)
  {
      if(g_out_prefix)
          return;
      /** copy input filename with extra space */
      g_out_prefix = malloc(strlen(g_in_file) + strlen(add) + 16);
      strcpy(g_out_prefix, g_in_file);
      /** remove extension and add '/' */
      char *filename = strrchr(g_out_prefix, '/');
      // have p points to the beginning or after the last '/'
      filename = (filename == NULL) ? g_out_prefix : filename + 1;
      // extension ?
      char *dot = strrchr(filename, '.');
      if(dot)
      {
          *dot = 0; // cut at the dot
          strcat(dot, replace);
      }
      else
          strcat(filename, add); // add extra string
  
      if(slash)
      {
          strcat(filename, "/");
          /** make sure the directory exists */
          mkdir(g_out_prefix, S_IRWXU | S_IRGRP | S_IROTH);
      }
  }
  
  static int do_fwu(uint8_t *buf, int size)
  {
      struct fwu_hdr_t *hdr = (void *)buf;
  
      if(size < (int)sizeof(struct fwu_hdr_t))
      {
          cprintf(GREY, "File too small\n");
          return 1;
      }
      cprintf(BLUE, "Header\n");
      cprintf(GREEN, "  Signature:");
      for(int i = 0; i < FWU_SIG_SIZE; i++)
          cprintf(YELLOW, " %02x", hdr->sig[i]);
      if(memcmp(hdr->sig, g_fwu_signature, FWU_SIG_SIZE) == 0)
          cprintf(RED, " Ok\n");
      else
      {
          cprintf(RED, " Mismatch\n");
          let_the_force_flow(__LINE__);
      }
  
      cprintf_field("  FW size: ", "%d ", hdr->fw_size);
      if((int)hdr->fw_size == size)
          cprintf(RED, " Ok\n");
      else if((int)hdr->fw_size < size)
          cprintf(RED, " Ok (file greater than firmware)\n");
      else
      {
          cprintf(RED, " Error (file too small)\n");
          let_the_force_flow(__LINE__);
      }
  
      cprintf_field("  Block size: ", "%d ", hdr->block_size);
      check_field(hdr->block_size, FWU_BLOCK_SIZE, "Ok\n", "Invalid\n");
  
      cprintf_field("  Version: ", "%x ", hdr->version);
      int ver = get_version(buf, size);
      if(ver < 0)
      {
          cprintf(RED, "(Unknown)\n");
          return -1;
      }
      else
          cprintf(RED, "(Ver. %d)\n", g_version[ver].version);
  
      cprintf_field("  Unknown: ", "0x%x ", hdr->unk);
      check_field(hdr->unk, g_version[ver].unk, "Ok\n", "Invalid\n");
  
      cprintf(GREEN, "  Signature:");
      for(int i = 0; i < FWU_SIG_SIZE; i++)
          cprintf(YELLOW, " %02x", hdr->sig2[i]);
      if(memcmp(hdr->sig2, g_version[ver].sig2, FWU_SIG_SIZE) == 0)
          cprintf(RED, " Ok\n");
      else
      {
          cprintf(RED, " Mismatch\n");
          let_the_force_flow(__LINE__);
      }
  
      build_out_prefix(".afi", ".afi", false);
  
      if(g_version[ver].version == 3)
      {
          uint8_t unk[32];
          memset(unk, 0, sizeof(unk));
          uint8_t block[512];
          memset(block, 0, sizeof(block));
          int ret = do_sthg_fwu_v3(buf, &size, unk, block);
          continue_the_force(ret);
  
          cprintf(GREY, "Descrambling to %s... ", g_out_prefix);
          FILE *f = fopen(g_out_prefix, "wb");
          if(f)
          {
              fwrite(buf, size, 1, f);
              fclose(f);
              cprintf(RED, "Ok\n");
          }
          else
              cprintf(RED, "Failed: %m\n");
      }
      
      return 0;
  }
  
  static bool check_fwu(uint8_t *buf, int size)
  {
      struct fwu_hdr_t *hdr = (void *)buf;
  
      if(size < (int)sizeof(struct fwu_hdr_t))
          return false;
      return memcmp(hdr->sig, g_fwu_signature, FWU_SIG_SIZE) == 0;
  }
  
  /**
   * AFI
   *
   * part of this work comes from s1mp3/s1fwx
   **/
  
  #define AFI_ENTRIES     126
  #define AFI_SIG_SIZE    4
  
  struct afi_hdr_t
  {
      uint8_t sig[AFI_SIG_SIZE];
      uint16_t vendor_id;
      uint16_t product_id;
      uint8_t ver_id[2];
      uint8_t ext_ver_id[2];
      uint8_t year[2];
      uint8_t month;
      uint8_t day;
      uint32_t afi_size;
      uint32_t res[3];
  } __attribute__((packed));
  
  struct afi_entry_t
  {
      char name[8];
      char ext[3];
      char type;
      uint32_t addr;
      uint32_t offset;
      uint32_t size;
      char desc[4];
      uint32_t checksum;
  } __attribute__((packed));
  
  struct afi_post_hdr_t
  {
      uint8_t res[28];
      uint32_t checksum;
  } __attribute__((packed));
  
  struct afi_t
  {
      struct afi_hdr_t hdr;
      struct afi_entry_t entry[AFI_ENTRIES];
      struct afi_post_hdr_t post;
  };
  
  #define AFI_ENTRY_BREC  'B'
  #define AFI_ENTRY_FWSC  'F'
  #define AFI_ENTRY_ADFUS 'A'
  #define AFI_ENTRY_FW    'I'
  
  #define AFI_ENTRY_DLADR_BREC  0x00000006    // 'B'
  #define AFI_ENTRY_DLADR_FWSC  0x00020008    // 'F'
  #define AFI_ENTRY_DLADR_ADFUS 0x000C0008    // 'A'
  #define AFI_ENTRY_DLADR_ADFU  0x00000000    // 'U'
  #define AFI_ENTRY_DLADR_FW    0x00000011    // 'I'
  
  const uint8_t g_afi_signature[AFI_SIG_SIZE] =
  {
      'A', 'F', 'I', 0
  };
  
  static uint32_t afi_checksum(void *ptr, int size)
  {
      uint32_t crc = 0;
      uint32_t *cp = ptr;
      for(; size >= 4; size -= 4)
          crc += *cp++;
      if(size == 1)
          crc += *(uint8_t *)cp;
      else if(size == 2)
          crc += *(uint16_t *)cp;
      else if(size == 3)
          crc += *(uint16_t *)cp + ((*(uint8_t *)(cp + 2)) << 16);
      return crc;
  }
  
  static void build_filename(char buf[16], struct afi_entry_t *ent)
  {
      int pos = 0;
      for(int i = 0; i < 8 && ent->name[i] != ' '; i++)
          buf[pos++] = ent->name[i];
      buf[pos++] = '.';
      for(int i = 0; i < 3 && ent->ext[i] != ' '; i++)
          buf[pos++] = ent->ext[i];
      buf[pos] = 0;
  }
  
  static int do_afi(uint8_t *buf, int size)
  {
      struct afi_t *afi = (void *)buf;
  
      if(size < (int)sizeof(struct afi_t))
      {
          cprintf(GREY, "File too small\n");
          return 1;
      }
      cprintf(BLUE, "Header\n");
      cprintf(GREEN, "  Signature:");
      for(int i = 0; i < AFI_SIG_SIZE; i++)
          cprintf(YELLOW, " %02x", afi->hdr.sig[i]);
      if(memcmp(afi->hdr.sig, g_afi_signature, AFI_SIG_SIZE) == 0)
          cprintf(RED, " Ok\n");
      else
      {
          cprintf(RED, " Mismatch\n");
          let_the_force_flow(__LINE__);
      }
  
      cprintf_field("  Vendor ID: ", "0x%x\n", afi->hdr.vendor_id);
      cprintf_field("  Product ID: ", "0x%x\n", afi->hdr.product_id);
      cprintf_field("  Version: ", "%x.%x\n", afi->hdr.ver_id[0], afi->hdr.ver_id[1]);
      cprintf_field("  Ext Version: ", "%x.%x\n", afi->hdr.ext_ver_id[0],
          afi->hdr.ext_ver_id[1]);
      cprintf_field("  Date: ", "%02x/%02x/%02x%02x\n", afi->hdr.day, afi->hdr.month,
          afi->hdr.year[0], afi->hdr.year[1]);
  
      cprintf_field("  AFI size: ", "%d ", afi->hdr.afi_size);
      if((int)afi->hdr.afi_size == size)
          cprintf(RED, " Ok\n");
      else if((int)afi->hdr.afi_size < size)
          cprintf(RED, " Ok (file greater than archive)\n");
      else
      {
          cprintf(RED, " Error (file too small)\n");
          let_the_force_flow(__LINE__);
      }
  
      cprintf_field("  Reserved: ", "%x %x %x\n", afi->hdr.res[0],
          afi->hdr.res[1], afi->hdr.res[2]);
  
      build_out_prefix(".fw", "", true);
      
      cprintf(BLUE, "Entries\n");
      for(int i = 0; i < AFI_ENTRIES; i++)
      {
          if(afi->entry[i].name[0] == 0)
              continue;
          struct afi_entry_t *entry = &afi->entry[i];
          char filename[16];
          build_filename(filename, entry);
          cprintf(RED, "  %s\n", filename);
          cprintf_field("    Type: ", "%02x", entry->type);
          if(isprint(entry->type))
              cprintf(RED, " %c", entry->type);
          printf("\n");
          cprintf_field("    Addr: ", "0x%x\n", entry->addr);
          cprintf_field("    Offset: ", "0x%x\n", entry->offset);
          cprintf_field("    Size: ", "0x%x\n", entry->size);
          cprintf_field("    Desc: ", "%.4s\n", entry->desc);
          cprintf_field("    Checksum: ", "0x%x ", entry->checksum);
          uint32_t chk = afi_checksum(buf + entry->offset, entry->size);
          cprintf(RED, "%s\n", chk == entry->checksum ? "Ok" : "Mismatch");
  
          char *name = malloc(strlen(g_out_prefix) + strlen(filename) + 16);
          sprintf(name, "%s%s", g_out_prefix, filename);
          
          cprintf(GREY, "Unpacking to %s... ", name);
          FILE *f = fopen(name, "wb");
          if(f)
          {
              fwrite(buf + entry->offset, entry->size, 1, f);
              fclose(f);
              cprintf(RED, "Ok\n");
          }
          else
              cprintf(RED, "Failed: %m\n");
      }
  
      cprintf(BLUE, "Post Header\n");
      cprintf_field("  Checksum: ", "%x ", afi->post.checksum);
      uint32_t chk = afi_checksum(buf, sizeof(struct afi_t) - 4);
      cprintf(RED, "%s\n", chk == afi->post.checksum ? "Ok" : "Mismatch");
  
      return 0;
  }
  
  static bool check_afi(uint8_t *buf, int size)
  {
      struct afi_hdr_t *hdr = (void *)buf;
  
      if(size < (int)sizeof(struct afi_hdr_t))
          return false;
      return memcmp(hdr->sig, g_afi_signature, AFI_SIG_SIZE) == 0;
  }
  
  /**
   * FW
   **/
  
  #define FW_SIG_SIZE 4
  
  #define FW_ENTRIES  240
  
  struct fw_entry_t
  {
      char name[8];
      char ext[3];
      uint8_t attr;
      uint8_t res[2];
      uint16_t version;
      uint32_t block_offset; // offset shift by 9
      uint32_t size;
      uint32_t unk;
      uint32_t checksum;
  } __attribute__((packed));
  
  struct fw_hdr_t
  {
      uint8_t sig[FW_SIG_SIZE];
      uint32_t res[4];
      uint8_t year[2];
      uint8_t month;
      uint8_t day;
      uint16_t usb_vid;
      uint16_t usb_pid;
      uint32_t checksum;
      char productor[16];
      char str2[16];
      char str3[32];
      char dev_name[32];
      uint8_t res2[8 * 16];
      char usb_name1[8];
      char usb_name2[8];
      char res3[4 * 16 + 1];
      char mtp_name1[33];
      char mtp_name2[33];
      char mtp_ver[33];
      uint16_t mtp_vid;
      uint16_t mtp_pid;
      char fw_ver[64];
      uint32_t res4[2];
  
      struct fw_entry_t entry[FW_ENTRIES];
  } __attribute__((packed));
  
  const uint8_t g_fw_signature[FW_SIG_SIZE] =
  {
      0x55, 0xaa, 0xf2, 0x0f
  };
  
  static void build_filename_fw(char buf[16], struct fw_entry_t *ent)
  {
      int pos = 0;
      for(int i = 0; i < 8 && ent->name[i] != ' '; i++)
          buf[pos++] = ent->name[i];
      buf[pos++] = '.';
      for(int i = 0; i < 3 && ent->ext[i] != ' '; i++)
          buf[pos++] = ent->ext[i];
      buf[pos] = 0;
  }
  
  static int do_fw(uint8_t *buf, int size)
  {
      struct fw_hdr_t *hdr = (void *)buf;
  
      if(size < (int)sizeof(struct fw_hdr_t))
      {
          cprintf(GREY, "File too small\n");
          return 1;
      }
      cprintf(BLUE, "Header\n");
      cprintf(GREEN, "  Signature:");
      for(int i = 0; i < FW_SIG_SIZE; i++)
          cprintf(YELLOW, " %02x", hdr->sig[i]);
      if(memcmp(hdr->sig, g_fw_signature, FW_SIG_SIZE) == 0)
          cprintf(RED, " Ok\n");
      else
      {
          cprintf(RED, " Mismatch\n");
          let_the_force_flow(__LINE__);
      }
  
      cprintf_field("  USB VID: ", "0x%x\n", hdr->usb_vid);
      cprintf_field("  USB PID: ", "0x%x\n", hdr->usb_pid);
      cprintf_field("  Date: ", "%x/%x/%x%x\n", hdr->day, hdr->month, hdr->year[0], hdr->year[1]);
      cprintf_field("  Checksum: ", "%x\n", hdr->checksum);
      cprintf_field("  Productor: ", "%.16s\n", hdr->productor);
      cprintf_field("  String 2: ", "%.16s\n", hdr->str2);
      cprintf_field("  String 3: ", "%.32s\n", hdr->str3);
      cprintf_field("  Device Name: ", "%.32s\n", hdr->dev_name);
      cprintf(GREEN, "  Unknown:\n");
      for(int i = 0; i < 8; i++)
      {
          cprintf(YELLOW, "    ");
          for(int j = 0; j < 16; j++)
              cprintf(YELLOW, "%02x ", hdr->res2[i * 16 + j]);
          cprintf(YELLOW, "\n");
      }
      cprintf_field("  USB Name 1: ", "%.8s\n", hdr->usb_name1);
      cprintf_field("  USB Name 2: ", "%.8s\n", hdr->usb_name2);
      cprintf_field("  MTP Name 1: ", "%.32s\n", hdr->mtp_name1);
      cprintf_field("  MTP Name 2: ", "%.32s\n", hdr->mtp_name2);
      cprintf_field("  MTP Version: ", "%.32s\n", hdr->mtp_ver);
  
      cprintf_field("  MTP VID: ", "0x%x\n", hdr->mtp_vid);
      cprintf_field("  MTP PID: ", "0x%x\n", hdr->mtp_pid);
      cprintf_field("  FW Version: ", "%.64s\n", hdr->fw_ver);
  
      build_out_prefix(".unpack", "", true);
      
      cprintf(BLUE, "Entries\n");
      for(int i = 0; i < AFI_ENTRIES; i++)
      {
          if(hdr->entry[i].name[0] == 0)
              continue;
          struct fw_entry_t *entry = &hdr->entry[i];
          char filename[16];
          build_filename_fw(filename, entry);
          cprintf(RED, "  %s\n", filename);
          cprintf_field("    Attr: ", "%02x\n", entry->attr);
          cprintf_field("    Offset: ", "0x%x\n", entry->block_offset << 9);
          cprintf_field("    Size: ", "0x%x\n", entry->size);
          cprintf_field("    Unknown: ", "%x\n", entry->unk);
          cprintf_field("    Checksum: ", "0x%x ", entry->checksum);
          uint32_t chk = afi_checksum(buf + (entry->block_offset << 9), entry->size);
          cprintf(RED, "%s\n", chk == entry->checksum ? "Ok" : "Mismatch");
          if(g_out_prefix)
          {
              char *name = malloc(strlen(g_out_prefix) + strlen(filename) + 16);
              sprintf(name, "%s%s", g_out_prefix, filename);
              
              cprintf(GREY, "Unpacking to %s... ", name);
              FILE *f = fopen(name, "wb");
              if(f)
              {
                  fwrite(buf + (entry->block_offset << 9), entry->size, 1, f);
                  fclose(f);
                  cprintf(RED, "Ok\n");
              }
              else
              cprintf(RED, "Failed: %m\n");
          }
      }
  
      return 0;
  }
  
  static bool check_fw(uint8_t *buf, int size)
  {
      struct fw_hdr_t *hdr = (void *)buf;
  
      if(size < (int)sizeof(struct fw_hdr_t))
          return false;
      return memcmp(hdr->sig, g_fw_signature, FW_SIG_SIZE) == 0;
  }
  
  static void usage(void)
  {
      printf("Usage: atjboottool [options] firmware\n");
      printf("Options:\n");
      printf("  -o <prefix>\tSet output prefix\n");
      printf("  -f/--force\tForce to continue on errors\n");
      printf("  -?/--help\tDisplay this message\n");
      printf("  -d/--debug\tDisplay debug messages\n");
      printf("  -c/--no-color\tDisable color output\n");
      printf("  --fwu\tUnpack a FWU firmware file\n");
      printf("  --afi\tUnpack a AFI archive file\n");
      printf("  --fw\tUnpack a FW archive file\n");
      printf("The default is to try to guess the format.\n");
      printf("If several formats are specified, all are tried.\n");
      printf("If no output prefix is specified, a default one is picked.\n");
      exit(1);
  }
  
  int main(int argc, char **argv)
  {
      bool try_fwu = false;
      bool try_afi = false;
      bool try_fw = false;
      
      while(1)
      {
          static struct option long_options[] =
          {
              {"help", no_argument, 0, '?'},
              {"debug", no_argument, 0, 'd'},
              {"no-color", no_argument, 0, 'c'},
              {"force", no_argument, 0, 'f'},
              {"fwu", no_argument, 0, 'u'},
              {"afi", no_argument, 0, 'a'},
              {"fw", no_argument, 0, 'w'},
              {0, 0, 0, 0}
          };
  
          int c = getopt_long(argc, argv, "?dcfo:a1", long_options, NULL);
          if(c == -1)
              break;
          switch(c)
          {
              case -1:
                  break;
              case 'c':
                  enable_color(false);
                  break;
              case 'd':
                  g_debug = true;
                  break;
              case 'f':
                  g_force = true;
                  break;
              case '?':
                  usage();
                  break;
              case 'o':
                  g_out_prefix = optarg;
                  break;
              case 'a':
                  try_afi = true;
                  break;
              case 'u':
                  try_fwu = true;
                  break;
              case 'w':
                  try_fw = true;
                  break;
              default:
                  abort();
          }
      }
  
      if(argc - optind != 1)
      {
          usage();
          return 1;
      }
  
      g_in_file = argv[optind];
      FILE *fin = fopen(g_in_file, "r");
      if(fin == NULL)
      {
          perror("Cannot open boot file");
          return 1;
      }
      fseek(fin, 0, SEEK_END);
      long size = ftell(fin);
      fseek(fin, 0, SEEK_SET);
  
      void *buf = malloc(size);
      if(buf == NULL)
      {
          perror("Cannot allocate memory");
          return 1;
      }
  
      if(fread(buf, size, 1, fin) != 1)
      {
          perror("Cannot read file");
          return 1;
      }
      
      fclose(fin);
  
      int ret = -99;
      if(try_fwu || check_fwu(buf, size))
          ret = do_fwu(buf, size);
      else if(try_afi || check_afi(buf, size))
          ret = do_afi(buf, size);
      else if(try_fw || check_fw(buf, size))
          ret = do_fw(buf, size);
      else
      {
          cprintf(GREY, "No valid format found\n");
          ret = 1;
      }
      
      if(ret != 0)
      {
          cprintf(GREY, "Error: %d", ret);
          if(!g_force)
              cprintf(GREY, " (use --force to force processing)");
          printf("\n");
          ret = 2;
      }
      free(buf);
  
      color(OFF);
  
      return ret;
  }
  
  