OpenWrt – Rev 1
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#include <stdlib.h>
#include <sys/types.h>
#include <stdio.h>
#include <inttypes.h>
#include <string.h>
#include <getopt.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/stat.h>
#include "bcmalgo.h"
#define UTIL_VERSION "0.1"
#define ENDIAN_REVERSE_NEEDED
uint32_t reverse_endian32 ( uint32_t data )
{
#ifdef ENDIAN_REVERSE_NEEDED
return 0 | ( data & 0x000000ff ) << 24
| ( data & 0x0000ff00 ) << 8
| ( data & 0x00ff0000 ) >> 8
| ( data & 0xff000000 ) >> 24;
#else
return data;
#endif
}
uint16_t reverse_endian16 ( uint16_t data )
{
#ifdef ENDIAN_REVERSE_NEEDED
return 0 | ( data & 0x00ff ) << 8
| ( data & 0xff00 ) >> 8;
#else
return data;
#endif
}
uint32_t get_buffer_crc ( char* filebuffer,size_t size )
{
long crc=0xffffffffL;
long crcxor = 0xffffffffL;
long num4 = 0xffffffffL;
long num5 = size;
long num6 = 0x4c11db7L;
long num7 = 0x80000000L;
int i;
long j;
for ( i = 0; i < ( num5 ); i++ )
{
long num2 = filebuffer[i];
for ( j = 0x80L; j != 0L; j = j >> 1 )
{
long num3 = crc & num7;
crc = crc << 1;
if ( ( num2 & j ) != 0L )
{
num3 ^= num7;
}
if ( num3 != 0L )
{
crc ^= num6;
}
}
}
crc ^= crcxor;
crc &= num4;
uint8_t b1 = ( uint8_t ) ( ( crc & -16777216L ) >> 0x18 );
uint8_t b2 = ( uint8_t ) ( ( crc & 0xff0000L ) >> 0x10 );
uint8_t b3 = ( uint8_t ) ( ( crc & 0xff00L ) >> 8 );
uint8_t b4 = ( uint8_t ) ( crc & 0xffL );
int32_t crc_result = ( b1 | b2 << 8| b3 << 16| b4 <<24 );
return reverse_endian32 ( crc_result );
}
//Thnx to Vector for the algo.
uint32_t get_file_crc ( char* filename )
{
struct stat buf;
stat ( filename,&buf );
char* filebuffer = malloc ( buf.st_size+10 );
FILE* fd = fopen ( filename,"r" );
fread ( filebuffer, 1, buf.st_size,fd );
fclose ( fd );
uint32_t crc = get_buffer_crc ( filebuffer,buf.st_size );
free ( filebuffer );
return crc;
}
uint16_t get_hcs ( ldr_header_t* hd )
{
uint8_t* head = ( uint8_t* ) hd;
uint8_t hcs_minor;
uint8_t hcs_major;
uint16_t n = 0xffff;
uint16_t m = 0;
int state = 0;
int i,j;
for ( i = 0; i < 0x54; i++ )
{
uint16_t m = head[i];
m = m << 8;
for ( j = 0; j < 8; j++ )
{
if ( ( ( n ^ m ) & 0x8000 ) == 0 )
{
state = 0;
}
else
{
state = 1;
}
n = n << 1;
if ( state )
{
n ^= 0x1021;
}
m = m << 1;
}
n &= 0xffff;
}
n ^= 0xffff;
hcs_major = ( uint8_t ) ( ( n & 0xff00 ) >> 8 );
hcs_minor = ( uint8_t ) ( n & 0xff );
uint16_t hcs = hcs_major <<8 | hcs_minor;
return hcs;
}
ldr_header_t* construct_header ( uint32_t magic, uint16_t rev_maj,uint16_t rev_min, uint32_t build_date, uint32_t filelen, uint32_t ldaddress, const char* filename, uint32_t crc_data )
{
ldr_header_t* hd = malloc ( sizeof ( ldr_header_t ) );
hd->magic=reverse_endian16 ( magic );
hd->control=0; //FixMe: Make use of it once compression is around
hd->rev_min = reverse_endian16 ( rev_min );
hd->rev_maj = reverse_endian16 ( rev_maj );
hd->build_date = reverse_endian32 ( build_date );
hd->filelen = reverse_endian32 ( filelen );
hd->ldaddress = reverse_endian32 ( ldaddress );
printf ( "Creating header for %s...\n", filename );
if ( strlen ( filename ) >63 )
{
printf ( "[!] Filename too long - stripping it to 63 bytes.\n" );
strncpy ( ( char* ) &hd->filename, filename, 63 );
hd->filename[63]=0x00;
}
else
{
strcpy ( ( char* ) &hd->filename, filename );
}
hd->crc=reverse_endian32 ( crc_data );
hd->hcs = reverse_endian16 ( get_hcs ( hd ) );
return hd;
}
static char control_unc[] = "Uncompressed";
static char control_lz[] = "LZRW1/KH";
static char control_mlzo[] = "mini-LZO";
static char control_nrv[] = "NRV2D99 [Bootloader?]";
static char control_nstdlzma[] = "(non-standard) LZMA";
static char control_unk[] = "Unknown";
char* get_control_info ( uint16_t control )
{
control = reverse_endian16 ( control );
switch ( control )
{
case 0:
return control_unc;
break;
case 1:
return control_lz;
break;
case 2:
return control_mlzo;
break;
case 3:
return control_unc;
break;
case 4:
return control_nrv;
break;
case 5:
return control_nstdlzma;
break;
case 6:
return control_unc;
break;
case 7:
return control_unc;
break;
default:
return control_unk;
break;
}
}
int dump_header ( ldr_header_t* hd )
{
printf ( "=== Header Information ===\n" );
printf ( "Header magic:\t0x%04X\n",reverse_endian16 ( hd->magic ) );
printf ( "Control:\t0x%04X (%s)\n",reverse_endian16 ( hd->control ), get_control_info ( hd->control ) );
printf ( "Major rev. :\t0x%04X\n",reverse_endian16 ( hd->rev_maj ) );
printf ( "Minor rev. :\t0x%04X\n",reverse_endian16 ( hd->rev_min ) );
printf ( "File name :\t%s\n", ( char* ) &hd->filename );
printf ( "File length:\t%d bytes\n", reverse_endian32 ( hd->filelen ) );
printf ( "Build time:\t0x%08X //FixMe: print in human-readable form\n", reverse_endian32 ( hd->build_date ) ); //FixMe:
printf ( "HCS:\t\t0x%04X ",reverse_endian16 ( hd->hcs ) );
uint16_t hcs = get_hcs ( hd );
int ret=0;
if ( hcs ==reverse_endian16 ( hd->hcs ) )
{
printf ( "(OK!)\n" );
}
else
{
printf ( "(ERROR! expected 0x%04X)\n",hcs );
ret=1;
}
//printf("HCS:\t0x%02X",reverse_endian32(hd->hcs));
printf ( "Load address:\t0x%08X\n", reverse_endian32 ( hd->ldaddress ) ); //FixMe:
printf ( "HNW:\t\t0x%04X\n",reverse_endian16 ( hd->her_znaet_chto ) ); //Hell knows what
printf ( "CRC:\t\t0x%08X\n",reverse_endian32 ( hd->crc ) );
printf ( "=== Binary Header Dump===\n" );
int i,j;
uint8_t* head = ( uint8_t* ) hd;
for ( i=0;i<=sizeof ( ldr_header_t );i++ )
{
if ( i % 8==0 )
printf ( "\n" );
printf ( "0x%02x ",head[i] );
}
printf ( "\n\n== End Of Header dump ==\n" );
return ret;
}
void print_copyright()
{
printf ( "Part of bcm-utils package ver. " UTIL_VERSION " \n" );
printf ( "Copyright (C) 2009 Andrew 'Necromant' Andrianov\n"
"This is free software, and you are welcome to redistribute it\n"
"under certain conditions. See COPYING for details\n" );
}