Dune:DSF-Service files: Difference between revisions

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==Overview==
==Overview==
Sometimes it may be of interest to decode a service file distributed or make your own little script to clean up things.
Sometimes it may be of interest to decode a service file distributed or make your own little script to clean up things.
I found this snippet of code at MPC Club and it was written by ScottJ97 (I think)  
I found this snippet of code at MPC Club and it was written by Accident 2009 (I think)  
[http://www.mpcclub.com/forum/showthread.php?t=26187 ScottJ97's thread on MPC Club]
[http://www.mpcclub.com/forum/showthread.php?t=26187 ScottJ97's thread on MPC Club]


==The Code==
==The Code==
This is just a copy and paste from the [http://pastebin.com/raw.php?i=bG8ZARUR pastebin] that most likely will die in the future
This is an extract from [http://pastebin.com/raw.php?i=bG8ZARUR pastebin] that most likely will die in the future.
[http://www.lysator.liu.se/~jonma/Dune/dsf_pack.c link]
<tt><pre>/*
<tt><pre>/*
  *
  *
Line 29: Line 30:
  *
  *
  */
  */
#include <stdio.h>
#include <fcntl.h>
#include <stdint.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
extern int getopt();
extern char *optarg;
extern int optind;
static char *arg_decode      = NULL;
static char *arg_encode      = NULL;
static char *arg_outfilename = NULL;
static char *arg_comparename = NULL;
static int  arg_verbose    = 0;
// XOR block pulled from "shell".
static uint8_t key[] = {
        0xDA,
// Ah the KEY goes here, let's see if HDi gets angry about this....
0x46
};
static void options(char *prog)
{
        printf("\n");
        printf("%s - Dune .dsf encode/decode program\n\n", prog);
        printf("  options:\n");
        printf("  -h          : display usage help (this output)\n");
        printf("  -d filename : decode .dsf to outfile.gz\n");
        printf("  -e filename : encode infile.gz to .dsf\n");
        printf("  -o filename : specify different output filename\n");
        printf("  -c filename : compare encode with file\n");
        printf("  -v          : verbose it up!\n");
        printf("\n");
        printf("Be aware that dune service files have to be named dune_service_*.dsf\n\n");
        printf("Dune encoding tool by Accident.\nResist the temptation to do bad!\n\n");
        exit(0);
}
void arguments(int argc, char **argv)
{
        int opt;
   
        while ((opt=getopt(argc, argv,
                                          "hd:e:o:vc:"
                                          )) != -1) {
                switch(opt) {
                case 'h':
                        options(argv[0]);
                        break;
                case 'd':
                        arg_decode = strdup(optarg);
                        break;
                case 'e':
                        arg_encode = strdup(optarg);
                        break;
                case 'o':
                        arg_outfilename = strdup(optarg);
                        break;
                case 'c':
                        arg_comparename = strdup(optarg);
                        break;
                case 'v':
                        arg_verbose++;
                        break;
                }
        }
        if (!arg_decode && !arg_encode)
                options(argv[0]);
}
int main(int argc, char **argv)
{
        FILE *fd = NULL, *out = NULL;
        uint8_t buffer[0x1000], v0,v1,a1,nv0;
        uint32_t red, i, half_red;
        uint32_t decode = 0;
        arguments(argc, argv);
        if (arg_decode)
                dune_decode(arg_decode);
        if (arg_encode)
                dune_encode(arg_encode);
}
int dune_decode(char *infilename)
{
        FILE *fd = NULL, *out = NULL;
        uint8_t buffer[0x1000], v0,v1,a1,nv0;
        uint32_t red, i, half_red;
        uint32_t decode = 0;
        fd = fopen(infilename, "rb");
        if (!fd) goto failed;
        out = fopen(arg_outfilename ? arg_outfilename : "outfile.gz", "wb");
        if (!out) goto failed;
        // read header
        if (fread(buffer, 0x141, 1, fd) != 1) goto failed;
        // Read blocks:
        while ((red = fread(buffer, 1, sizeof(buffer), fd)) > 0) {
                // Decode block
                if (arg_verbose)
                        printf("read %x \n", red);
                half_red = red>>1;
                for (i = 0; i < half_red; i++) {
                        v0 = buffer[i + half_red] ;
                        v1 = key[decode];
                        a1 = buffer[ i ];
                        nv0 = v0;
                        nv0 ^= v1;
                        nv0 ^= a1;
                        if (arg_verbose)
                                printf("  [%x]=%02X, xor %02X, [%x]=%02X, storing %02X\n",
                                          i+half_red, v0, v1, i, a1, nv0);
                        buffer[i] = nv0;
                        decode++;
                        if (decode >= sizeof(key))
                                decode = 0;
                }
                for (i = half_red; i < red; i++) {
                        v1 = key[decode];
                        a1 = buffer[ i ];
                        nv0 = v1;
                        nv0 ^= a1;
                        if (arg_verbose)
                                printf("  xor %02X, [%x]=%02X, storing %02X\n",
                                          v1, i, a1, nv0);
                        buffer[i] = nv0;
                        decode++;
                        if (decode >= sizeof(key))
                                decode = 0;
                }
                // Write block
                fwrite(buffer, red, 1, out);
        }
        fclose(fd);
        fclose(out);
        printf("Decode complete\n");
        return 0;
failed:
        perror(":");
        printf("failed\n");
        if (fd)
                fclose(fd);
        else
                fprintf(stderr, "Failed to open infile '%s'\r\n", infilename);
        if (out)
                fclose(out);
        else if (fd)
                fprintf(stderr, "Failed to open outfile '%s'\r\n",
                                arg_outfilename ? arg_outfilename : "outfile.gz");
}
int dune_encode(char *infilename)
{
        FILE *fd = NULL, *out = NULL, *compare=NULL;
        uint8_t buffer[0x1000], v0,v1,a1,nv0;
        uint8_t compbuf[0x1000];
        uint32_t red, i, half_red;
        uint32_t decode = 0;
        unsigned char stuff[] = {
                0x1d,0x25,0x7a,0xe4,0x27,0xff,0xe9,0x8c,0x58,0x0a,0x8b,0x18,0x70,0xbb,0xf2,0x87,
                0x3a,0xf2,0x41,0x68,0x9e,0x81,0x85,0xc6,0x82,0xe1,0x92,0x7d,0xa0,0x4e,0x5b,0xbd,
                0x73,0xd5,0xa1,0x9a,0xd4,0x8a,0x27,0x2c,0x95,0xb2,0x44,0x05,0x6d,0x37,0x8c,0xa7,
                0x29,0xce,0x0f,0xc7,0x4f,0x94,0x8e,0xd2,0x75,0x20,0x4f,0x15,0x6e,0xaa,0xd3,0xe1,0x7f
        };
        fd = fopen(infilename, "rb");
        if (!fd) goto failed;
        out = fopen(arg_outfilename ? arg_outfilename : "outfile.dsf", "wb");
        if (!out) goto failed;
        if (arg_comparename)
                compare=fopen(arg_comparename, "rb");
        // read header
        fwrite("DUNE SERVICE FILE", 18, 1, out);
        // One day work out what these are.
        fwrite("86673687", 9, 1, out);
        fwrite("54139262", 9, 1, out);
        fwrite("53151487", 9, 1, out);
        fwrite("50852538", 9, 1, out);
        fwrite("38155310", 9, 1, out);
        fwrite("9047468", 8, 1, out);
        fwrite("46935104", 9, 1, out);
        fwrite("64658461", 9, 1, out);
        fwrite("64007208", 9, 1, out);
        fwrite("93556737", 9, 1, out);
        fwrite("88478556", 9, 1, out);
        fwrite("6195915", 8, 1, out);
        fwrite("677883", 7, 1, out);
        fwrite("9851071", 8, 1, out);
        fwrite("82589884", 9, 1, out);
        fwrite("81953245", 9, 1, out);
        // First header thing is 0x100.
        fseek(out, 0x100, SEEK_SET);
        // Then there is 0x41 bytes of something.
        fwrite(stuff, sizeof(stuff), 1, out);
        if (compare)
                fseek(compare, 0x141, SEEK_SET);
        // Read blocks:
        while ((red = fread(buffer, 1, sizeof(buffer), fd)) > 0) {
                // Encode block
                if (arg_verbose)
                        printf("read %x \n", red);
                if (compare)
                        fread(compbuf, 1, red, compare);
                half_red = red>>1;
                decode = half_red % sizeof(key);
                if (arg_verbose) printf("Decode start %d\n", decode);
                for (i = half_red; i < red; i++) {
                        v1 = key[decode];
                        a1 = buffer[ i ];
                        nv0 = v1;
                        nv0 ^= a1;
                        if (arg_verbose)
                                printf("  xor %02X, [%x]=%02X, storing %02X\n",
                                          v1, i, a1, nv0);
                        buffer[i] = nv0;
                        if (compare &&
                                buffer[i] != compbuf[i])
                                printf("Compare buf has %02X\n", compbuf[i]);
                        decode++;
                        if (decode >= sizeof(key))
                                decode = 0;
                }
                decode = 0;
                if (arg_verbose) printf("Halfway point as decode %d\n", decode);
                for (i = 0; i < half_red; i++) {
                        v0 = buffer[i + half_red] ;
                        v1 = key[decode];
                        a1 = buffer[ i ];
                        nv0 = v0;
                        nv0 ^= v1;
                        nv0 ^= a1;
                        if (arg_verbose)
                                printf("  [%x]=%02X, xor %02X, [%x]=%02X, storing %02X\n",
                                          i+half_red, v0, v1, i, a1, nv0);
                        buffer[i] = nv0;
                        if (compare &&
                                buffer[i] != compbuf[i])
                                printf("Compare buf has %02X\n", compbuf[i]);
                        decode++;
                        if (decode >= sizeof(key))
                                decode = 0;
                }
                // Write block
                fwrite(buffer, red, 1, out);
        }
        fclose(fd);
        fclose(out);
        if (compare)
                fclose(compare);
        printf("Encode complete\n");
        return 0;
failed:
        perror(":");
        printf("failed\n");
        if (fd)
                fclose(fd);
        else
                fprintf(stderr, "Failed to open infile '%s'\r\n", infilename);
        if (out)
                fclose(out);
        else if (fd)
                fprintf(stderr, "Failed to open outfile '%s'\r\n",
                                arg_outfilename ? arg_outfilename : "outfile.gz");
        if (compare)
                fclose(compare);
}
d
</pre></tt>
</pre></tt>
--[[User:Gaston|Gaston]] 17:07, 19 January 2011 (JST)
--[[User:Gaston|Gaston]] 17:07, 19 January 2011 (JST)

Latest revision as of 08:28, 20 January 2011

This section is devoted to different ways of encoding or decoding service files for the HDi players:

Overview

Sometimes it may be of interest to decode a service file distributed or make your own little script to clean up things. I found this snippet of code at MPC Club and it was written by Accident 2009 (I think) ScottJ97's thread on MPC Club

The Code

This is an extract from pastebin that most likely will die in the future. link 

/*
 *
 * dsf_pack: HDi Dune Media Player service file packer.
 * 
 * Accident 2009: Epoch, encode small files, needs extra work for
 *                encodes over one page (I think) Never tried it.
 *
 * This is woefully incomplete. But it was enough for my requirements.
 *
 * For example: create a file with:
 * #!/bin/sh
 * /usr/sbin/telnetd &
 * exit 0
 *
 * Then pack it up. Note that the file must be named
 * "dune_service_XXXX.dsf" for it to be recognised.
 *
 * When the Dune runs it, it copies it to /tmp, gunzips it as
 * /tmp/service and runs it.
 *
 */

--Gaston 17:07, 19 January 2011 (JST)

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