From 5286c7ddb8d9744ef3acad7d59dff26130c981d5 Mon Sep 17 00:00:00 2001
From: Brandon Low <lostlogic@rockbox.org>
Date: Mon, 17 Apr 2006 20:32:25 +0000
Subject: Add copy and adjust helper for mp3entry struct as it is 1) not copy
 safe and 2) nonobvious that its not copy safe

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@9709 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/export/id3.h |  2 ++
 firmware/id3.c        | 34 ++++++++++++++++++++++++++++++++++
 2 files changed, 36 insertions(+)

diff --git a/firmware/export/id3.h b/firmware/export/id3.h
index 38494044fa..cc0d422e7a 100644
--- a/firmware/export/id3.h
+++ b/firmware/export/id3.h
@@ -138,5 +138,7 @@ bool mp3info(struct mp3entry *entry, const char *filename, bool v1first);
 char* id3_get_genre(const struct mp3entry* id3);
 char* id3_get_codec(const struct mp3entry* id3);
 int getid3v2len(int fd);
+void adjust_mp3entry(struct mp3entry *entry, void *dest, void *orig);
+void copy_mp3entry(struct mp3entry *dest, struct mp3entry *orig);
 
 #endif
diff --git a/firmware/id3.c b/firmware/id3.c
index aa370e836e..1188da9fd6 100644
--- a/firmware/id3.c
+++ b/firmware/id3.c
@@ -1013,6 +1013,40 @@ bool mp3info(struct mp3entry *entry, const char *filename, bool v1first)
     return false;
 }
 
+void adjust_mp3entry(struct mp3entry *entry, void *dest, void *orig)
+{
+    long offset;
+    if (orig > dest)
+        offset = - ((size_t)orig - (size_t)dest);
+    else
+        offset = (size_t)dest - (size_t)orig;
+
+    if (entry->title)
+        entry->title += offset;
+    if (entry->artist)
+        entry->artist += offset;
+    if (entry->album)
+        entry->album += offset;
+    if (entry->genre_string)
+        entry->genre_string += offset;
+    if (entry->track_string)
+        entry->track_string += offset;
+    if (entry->year_string)
+        entry->year_string += offset;
+    if (entry->composer)
+        entry->composer += offset;
+    if (entry->track_gain_string)
+        entry->track_gain_string += offset;
+    if (entry->album_gain_string)
+        entry->album_gain_string += offset;
+}
+
+void copy_mp3entry(struct mp3entry *dest, struct mp3entry *orig)
+{
+    memcpy(dest, orig, sizeof(struct mp3entry));
+    adjust_mp3entry(dest, dest, orig);
+}
+
 #ifdef DEBUG_STANDALONE
 
 char *secs2str(int ms)
-- 
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