From 149a7bab5bcd835a7370c3ae19a6d193a0d92e84 Mon Sep 17 00:00:00 2001
From: Barry Wardell <rockbox@barrywardell.net>
Date: Thu, 22 Mar 2007 15:53:37 +0000
Subject: Make Gigabeat's scramble endian-safe.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@12892 a1c6a512-1295-4272-9138-f99709370657
---
 tools/descramble.c | 15 +++++++++++++++
 tools/gigabeat.c   | 11 +++++++++--
 tools/scramble.c   |  7 +++++++
 3 files changed, 31 insertions(+), 2 deletions(-)

diff --git a/tools/descramble.c b/tools/descramble.c
index c993c9f25e..9d45b8c0dc 100644
--- a/tools/descramble.c
+++ b/tools/descramble.c
@@ -26,6 +26,21 @@
 
 int iaudio_decode(char *iname, char *oname);
 
+unsigned int le2int(unsigned char* buf)
+{
+   int32_t res = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
+
+   return res;
+}
+
+void int2le(unsigned int val, unsigned char* addr)
+{
+    addr[0] = val & 0xFF;
+    addr[1] = (val >> 8) & 0xff;
+    addr[2] = (val >> 16) & 0xff;
+    addr[3] = (val >> 24) & 0xff;
+}
+
 void usage(void)
 {
     printf("usage: descramble [options] <input file> <output file>\n");
diff --git a/tools/gigabeat.c b/tools/gigabeat.c
index 863d0741f2..f4d64ea511 100644
--- a/tools/gigabeat.c
+++ b/tools/gigabeat.c
@@ -49,6 +49,7 @@ int gigabeat_code(char *infile, char *outfile)
     FILE *in, *out;
     unsigned long size = 0;
     unsigned long bytes_read;
+    unsigned char buf[4];
     unsigned long data;
     unsigned long key = 0x19751217;
 
@@ -56,8 +57,11 @@ int gigabeat_code(char *infile, char *outfile)
     out = openoutfile(outfile);
 
     while (!feof(in)) {
-        bytes_read = fread(&data, 1, 4, in);
+        bytes_read = fread(buf, 1, 4, in);
 
+        /* Read in little-endian */
+        data = le2int(buf);
+        
         data = data ^ key;
 
         key = key + (key << 1);
@@ -65,7 +69,10 @@ int gigabeat_code(char *infile, char *outfile)
 
         size += bytes_read;
 
-        fwrite(&data, 1, bytes_read, out);
+        /* Write out little-endian */
+        int2le(data, buf);
+
+        fwrite(buf, 1, bytes_read, out);
     }
 
     fprintf(stderr, "File processed successfully\n" );
diff --git a/tools/scramble.c b/tools/scramble.c
index 7e6ca1f51c..555bf84291 100644
--- a/tools/scramble.c
+++ b/tools/scramble.c
@@ -52,6 +52,13 @@ void short2le(unsigned short val, unsigned char* addr)
     addr[1] = (val >> 8) & 0xff;
 }
 
+unsigned int le2int(unsigned char* buf)
+{
+   int32_t res = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
+
+   return res;
+}
+
 void int2le(unsigned int val, unsigned char* addr)
 {
     addr[0] = val & 0xFF;
-- 
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