buflib: Add crc field protecting buflib cookie integrity

This should catch the case of buffer misuse which results
in corrupted cookie of next allocation. The check is performed
on move_block() so it may be a bit late.

There is buflib_check_valid() provided which checks the
integrity of all cookies for given context.
On DEBUG build with --sdl-thread this check is carried out
for core_ctx on every context switch to catch problems earlier.

Change-Id: I999d4576084592394e3dbd3bdf0f32935ff5f601
Reviewed-on: http://gerrit.rockbox.org/711
Reviewed-by: Thomas Martitz <kugel@rockbox.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/apps/plugin.h b/apps/plugin.h
index 8a0d0562ff..1d1e9ee26e 100644
--- a/apps/plugin.h
+++ b/apps/plugin.h
@@ -457,7 +457,7 @@ struct plugin_api {
                                       int numberlen IF_CNFN_NUM_(, int *num));
     bool (*file_exists)(const char *file);
     char* (*strip_extension)(char* buffer, int buffer_size, const char *filename);
-    unsigned (*crc_32)(const void *src, unsigned len, unsigned crc32);
+    uint32_t (*crc_32)(const void *src, uint32_t len, uint32_t crc32);
 
     int (*filetype_get_attr)(const char* file);