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/*
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* tivodecode, (c) 2006, Jeremy Drake
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* See COPYING file for license terms
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*
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* derived from mpegcat, copyright 2006 Kees Cook, used with permission
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*/
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#include <stdio.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include "getopt_long.h"
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#include "happyfile.h"
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#include "tivo-parse.h"
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#include "turing_stream.h"
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#include "tivodecoder.h"
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#ifdef WIN32
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# define HOME_ENV_NAME "USERPROFILE"
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# define DEFAULT_EMPTY_HOME "C:"
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#else
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# define HOME_ENV_NAME "HOME"
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# define DEFAULT_EMPTY_HOME ""
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#endif
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static const char MAK_DOTFILE_NAME[] = "/.tivodecode_mak";
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static const char * VERSION_STR = "CVS Head";
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int o_verbose = 0;
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int o_no_verify = 0;
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happy_file * hfh=NULL;
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// file position options
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off_t begin_at = 0;
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static int hread_wrapper (void * mem, int size, void * fh)
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{
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return (int)hread (mem, size, (happy_file *)fh);
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}
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static int fwrite_wrapper (void * mem, int size, void * fh)
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{
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return (int)fwrite (mem, 1, size, (FILE *)fh);
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}
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static struct option long_options[] = {
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{"mak", 1, 0, 'm'},
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{"out", 1, 0, 'o'},
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{"help", 0, 0, 'h'},
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{"verbose", 0, 0, 'v'},
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{"version", 0, 0, 'V'},
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{"no-verify", 0, 0, 'n'},
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{0, 0, 0, 0}
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};
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static void do_help(char * arg0, int exitval)
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{
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fprintf(stderr, "Usage: %s [--help] [--verbose|-v] [--no-verify|-n] {--mak|-m} mak [{--out|-o} outfile] <tivofile>\n\n", arg0);
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#define ERROUT(s) fprintf(stderr, s)
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ERROUT (" --mak, -m media access key (required)\n");
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ERROUT (" --out, -o output file (default stdout)\n");
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ERROUT (" --verbose, -v verbose\n");
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ERROUT (" --no-verify, -n do not verify MAK while decoding\n");
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ERROUT (" --version, -V print the version information and exit\n\n");
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ERROUT (" --help, -h print this help and exit\n\n");
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ERROUT ("The file names specified for the output file or the tivo file may be -, which\n");
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ERROUT ("means stdout or stdin respectively\n\n");
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#undef ERROUT
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exit (exitval);
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}
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static void do_version(int exitval)
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{
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fprintf (stderr, "tivodecode version %s\n", VERSION_STR);
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fprintf (stderr, "Copyright (c) 2006, Jeremy Drake\n");
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fprintf (stderr, "See COPYING file in distribution for details\n");
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exit (exitval);
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}
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int main(int argc, char *argv[])
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{
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unsigned int marker;
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unsigned char byte;
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char first = 1;
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int running = 1;
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char * tivofile = NULL;
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char * outfile = NULL;
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char mak[12];
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int makgiven = 0;
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turing_state turing;
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FILE * ofh;
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memset(&turing, 0, sizeof(turing));
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memset(mak, 0, sizeof(mak));
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fprintf(stderr, "Encryption by QUALCOMM ;)\n\n");
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while (1)
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{
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int c = getopt_long (argc, argv, "m:o:hnvV", long_options, 0);
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if (c == -1)
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break;
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switch (c)
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{
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case 'm':
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strncpy(mak, optarg, 11);
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mak[11] = '\0';
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makgiven = 1;
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break;
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case 'o':
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outfile = optarg;
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break;
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case 'h':
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do_help(argv[0], 1);
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break;
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case 'v':
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o_verbose = 1;
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break;
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case 'n':
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o_no_verify = 1;
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break;
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case '?':
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do_help(argv[0], 2);
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break;
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case 'V':
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do_version(10);
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break;
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default:
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do_help(argv[0], 3);
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break;
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}
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}
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if (optind < argc)
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{
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tivofile=argv[optind++];
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if (optind < argc)
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do_help(argv[0], 4);
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}
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if (!makgiven)
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{
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char * mak_fname;
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FILE * mak_file;
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const char * home_dir = getenv(HOME_ENV_NAME);
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size_t home_dir_len;
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if (!home_dir)
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home_dir = DEFAULT_EMPTY_HOME;
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home_dir_len = strlen(home_dir);
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mak_fname = malloc (home_dir_len + sizeof(MAK_DOTFILE_NAME));
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if (!mak_fname)
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{
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fprintf(stderr, "error allocing string for mak config file name\n");
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exit(11);
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}
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memcpy (mak_fname, home_dir, home_dir_len);
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memcpy (mak_fname + home_dir_len, MAK_DOTFILE_NAME, sizeof(MAK_DOTFILE_NAME));
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if ((mak_file = fopen(mak_fname, "r")))
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{
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if (fread(mak, 1, 11, mak_file) >= 10)
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{
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int i;
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for (i = 11; i >= 10 && (mak[i] == '\0' || isspace(mak[i])); --i)
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{
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mak[i] = '\0';
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}
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makgiven = 1;
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}
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else if (ferror(mak_file))
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{
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perror ("reading mak config file");
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exit(12);
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}
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else
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{
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fprintf(stderr, "mak too short in mak config file\n");
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exit(13);
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}
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fclose (mak_file);
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}
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free(mak_fname);
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}
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if (!makgiven || !tivofile)
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{
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do_help(argv[0], 5);
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}
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if (!strcmp(tivofile, "-"))
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{
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hfh=hattach(stdin);
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}
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else
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{
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if (!(hfh=hopen(tivofile, "rb")))
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{
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perror(tivofile);
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return 6;
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}
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}
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if (!outfile || !strcmp(outfile, "-"))
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{
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ofh = stdout;
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}
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else
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{
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if (!(ofh = fopen(outfile, "wb")))
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{
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perror("opening output file");
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return 7;
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}
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}
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if ((begin_at = setup_turing_key (&turing, hfh, &hread_wrapper, mak)) < 0)
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{
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return 8;
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}
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if (hseek(hfh, begin_at, SEEK_SET) < 0)
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{
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perror ("seek");
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return 9;
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}
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marker = 0xFFFFFFFF;
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while (running)
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{
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if ((marker & 0xFFFFFF00) == 0x100)
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{
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int ret = process_frame(byte, &turing, htell(hfh), hfh, &hread_wrapper, ofh, &fwrite_wrapper);
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if (ret == 1)
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{
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marker = 0xFFFFFFFF;
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}
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else if (ret == 0)
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{
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fwrite(&byte, 1, 1, ofh);
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}
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else if (ret < 0)
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{
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perror ("processing frame");
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return 10;
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}
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}
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else if (!first)
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{
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fwrite(&byte, 1, 1, ofh);
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}
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marker <<= 8;
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if (hread(&byte, 1, hfh) == 0)
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{
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fprintf(stderr, "End of File\n");
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running = 0;
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}
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else
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marker |= byte;
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first = 0;
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}
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destruct_turing (&turing);
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if (hfh->fh == stdin)
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hdetach(hfh);
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else
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hclose(hfh);
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if (ofh != stdout)
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fclose(ofh);
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return 0;
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}
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/* vi:set ai ts=4 sw=4 expandtab: */
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