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Diffstat (limited to 'tools/gigabeat.c')
-rw-r--r-- | tools/gigabeat.c | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/tools/gigabeat.c b/tools/gigabeat.c new file mode 100644 index 0000000000..863d0741f2 --- /dev/null +++ b/tools/gigabeat.c | |||
@@ -0,0 +1,76 @@ | |||
1 | /*************************************************************************** | ||
2 | * __________ __ ___. | ||
3 | * Open \______ \ ____ ____ | | _\_ |__ _______ ___ | ||
4 | * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / | ||
5 | * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < | ||
6 | * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ | ||
7 | * \/ \/ \/ \/ \/ | ||
8 | * $Id$ | ||
9 | * | ||
10 | * Copyright (C) 2006 by Christian Hack | ||
11 | * | ||
12 | * All files in this archive are subject to the GNU General Public License. | ||
13 | * See the file COPYING in the source tree root for full license agreement. | ||
14 | * | ||
15 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY | ||
16 | * KIND, either express or implied. | ||
17 | * | ||
18 | ****************************************************************************/ | ||
19 | |||
20 | #include <stdio.h> | ||
21 | #include <stdlib.h> | ||
22 | |||
23 | static FILE * openinfile( const char * filename ) | ||
24 | { | ||
25 | FILE * F = fopen( filename, "rb" ); | ||
26 | if( F == NULL ) | ||
27 | { | ||
28 | fprintf( stderr, "Couldn't open input file %s\n", filename ); | ||
29 | perror( "Error was " ); | ||
30 | exit( -1 ); | ||
31 | }; | ||
32 | return F; | ||
33 | }; | ||
34 | |||
35 | static FILE * openoutfile( const char * filename ) | ||
36 | { | ||
37 | FILE * F = fopen( filename, "wb" ); | ||
38 | if( F == NULL ) | ||
39 | { | ||
40 | fprintf( stderr, "Couldn't open output file %s\n", filename ); | ||
41 | perror( "Error was " ); | ||
42 | exit( -1 ); | ||
43 | }; | ||
44 | return F; | ||
45 | }; | ||
46 | |||
47 | int gigabeat_code(char *infile, char *outfile) | ||
48 | { | ||
49 | FILE *in, *out; | ||
50 | unsigned long size = 0; | ||
51 | unsigned long bytes_read; | ||
52 | unsigned long data; | ||
53 | unsigned long key = 0x19751217; | ||
54 | |||
55 | in = openinfile(infile); | ||
56 | out = openoutfile(outfile); | ||
57 | |||
58 | while (!feof(in)) { | ||
59 | bytes_read = fread(&data, 1, 4, in); | ||
60 | |||
61 | data = data ^ key; | ||
62 | |||
63 | key = key + (key << 1); | ||
64 | key = key + 0x19751217; | ||
65 | |||
66 | size += bytes_read; | ||
67 | |||
68 | fwrite(&data, 1, bytes_read, out); | ||
69 | } | ||
70 | |||
71 | fprintf(stderr, "File processed successfully\n" ); | ||
72 | |||
73 | fclose(in); | ||
74 | fclose(out); | ||
75 | return(0); | ||
76 | } | ||