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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
*
* Copyright (C) 2012 Marcin Bukat
*
* 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 <stdlib.h>
#include <string.h>
#include <stdint.h>
#define RKLD_MAGIC 0x4c44524b
#define RKW_HEADER_SIZE 0x2c
/* slightly modified version from crc32.c in rockbox */
static uint32_t rkw_crc32(const void *src, uint32_t len)
{
const unsigned char *buf = (const unsigned char *)src;
/* polynomial 0x04c10db7 */
static const uint32_t crc32_lookup[16] =
{ /* lookup table for 4 bits at a time is affordable */
0x00000000, 0x04C10DB7, 0x09821B6E, 0x0D4316D9,
0x130436DC, 0x17C53B6B, 0x1A862DB2, 0x1E472005,
0x26086DB8, 0x22C9600F, 0x2F8A76D6, 0x2B4B7B61,
0x350C5B64, 0x31CD56D3, 0x3C8E400A, 0x384F4DBD
};
uint32_t crc32 = 0;
unsigned char byte;
uint32_t t;
while (len--)
{
byte = *buf++; /* get one byte of data */
/* upper nibble of our data */
t = crc32 >> 28; /* extract the 4 most significant bits */
t ^= byte >> 4; /* XOR in 4 bits of data into the extracted bits */
crc32 <<= 4; /* shift the CRC register left 4 bits */
crc32 ^= crc32_lookup[t]; /* do the table lookup and XOR the result */
/* lower nibble of our data */
t = crc32 >> 28; /* extract the 4 most significant bits */
t ^= byte & 0x0F; /* XOR in 4 bits of data into the extracted bits */
crc32 <<= 4; /* shift the CRC register left 4 bits */
crc32 ^= crc32_lookup[t]; /* do the table lookup and XOR the result */
}
return crc32;
}
static void int2le(unsigned int val, unsigned char* addr)
{
addr[0] = val & 0xFF;
addr[1] = (val >> 8) & 0xff;
addr[2] = (val >> 16) & 0xff;
addr[3] = (val >> 24) & 0xff;
}
int rkw_encode(char *iname, char *oname, unsigned long modelnum)
{
size_t len;
int length;
int rkwlength;
FILE *file;
uint32_t binary_crc, header_crc;
unsigned char *outbuf;
file = fopen(iname, "rb");
if (!file)
{
perror(iname);
return -1;
}
fseek(file,0,SEEK_END);
length = ftell(file);
fseek(file,0,SEEK_SET);
/* length of the RKW header + binary length + 4 bytes of CRC */
rkwlength = (length + RKW_HEADER_SIZE + 4);
outbuf = malloc(rkwlength);
if (!outbuf)
{
printf("out of memory!\n");
fclose(file);
return -1;
}
/* Clear the buffer to zero */
memset(outbuf, 0, rkwlength);
/* Build the RKW header */
int2le(RKLD_MAGIC, outbuf); /* magic */
int2le(RKW_HEADER_SIZE, outbuf+0x04); /* header size */
int2le(0x60000000, outbuf+0x08); /* base address */
int2le(0x60000000, outbuf+0x0c); /* load address */
int2le(0x60000000+length, outbuf+0x10); /* end address */
int2le(0x6035a5e4, outbuf+0x14); /* points to some unknown struct */
int2le(modelnum, outbuf+0x18); /* reserved (we abuse the format
* to store modelnum here
*/
int2le(0, outbuf+0x1c); /* reserved */
int2le(0x60000000, outbuf+0x20); /* entry point */
int2le(0xe0000000, outbuf+0x24); /* flags */
header_crc = rkw_crc32(outbuf, RKW_HEADER_SIZE - 4);
int2le(header_crc, outbuf+0x28); /* header CRC */
/* Copy the binary */
len = fread(outbuf + RKW_HEADER_SIZE, 1, length, file);
if(len < (size_t)length)
{
perror(iname);
free(outbuf);
fclose(file);
return -2;
}
fclose(file);
/* calc binary CRC and put at the end */
binary_crc = rkw_crc32 (outbuf + RKW_HEADER_SIZE, length);
int2le(binary_crc, outbuf + rkwlength - 4);
file = fopen(oname, "wb");
if (!file)
{
perror(oname);
free(outbuf);
return -3;
}
len = fwrite(outbuf, 1, rkwlength, file);
if(len < (size_t)length)
{
perror(oname);
fclose(file);
free(outbuf);
return -4;
}
fclose(file);
free(outbuf);
fprintf(stderr, "File encoded successfully\n" );
return 0;
}
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