rockbox/utils/atj2137/atjboottool/atjboottool.c

/***************************************************************************
 *             __________               __   ___.
 *   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;
}