add Gigabeat support to the scramble tools

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@10817 a1c6a512-1295-4272-9138-f99709370657

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 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2006 by Christian Hack
+ *
+ * All files in this archive are subject to the GNU General Public License.
+ * See the file COPYING in the source tree root for full license agreement.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#include <stdio.h>
+#include <stdlib.h>
+
+static FILE * openinfile( const char * filename )
+{
+    FILE * F = fopen( filename, "rb" );
+    if( F == NULL )
+    {
+        fprintf( stderr, "Couldn't open input file %s\n", filename );
+        perror( "Error was " );
+        exit( -1 );
+    };
+    return F;
+};
+
+static FILE * openoutfile( const char * filename )
+{
+    FILE * F = fopen( filename, "wb" );
+    if( F == NULL )
+    {
+        fprintf( stderr, "Couldn't open output file %s\n", filename );
+        perror( "Error was " );
+        exit( -1 );
+    };
+    return F;
+};
+
+int gigabeat_code(char *infile, char *outfile)
+{
+    FILE *in, *out;
+    unsigned long size = 0;
+    unsigned long bytes_read;
+    unsigned long data;
+    unsigned long key = 0x19751217;
+
+    in = openinfile(infile);
+    out = openoutfile(outfile);
+
+    while (!feof(in)) {
+        bytes_read = fread(&data, 1, 4, in);
+
+        data = data ^ key;
+
+        key = key + (key << 1);
+        key = key + 0x19751217;
+
+        size += bytes_read;
+
+        fwrite(&data, 1, bytes_read, out);
+    }
+
+    fprintf(stderr, "File processed successfully\n" );
+
+    fclose(in);
+    fclose(out);
+    return(0);
+}