usbloadergx/source/usbloader/frag.h

// worst case wbfs fragmentation scenario:
// 9GB (dual layer) / 2mb (wbfs sector size) = 4608
#define MAX_FRAG 20000
// max that ehcmodule_frag will allow at the moment is about:
// 40000/4/3-1 = 21844

#ifdef __cplusplus
extern "C"
{
#endif

#include "libwbfs/libwbfs.h"

    typedef struct
    {
        u32 offset; // file offset, in sectors unit
        u32 sector;
        u32 count;
    } Fragment;

    typedef struct
    {
        u32 size; // num sectors
        u32 num;  // num fragments
        u32 maxnum;
        Fragment frag[MAX_FRAG];
    } FragList;

    typedef int ( *frag_append_t )( void *ff, u32 offset, u32 sector, u32 count );

    int _FAT_get_fragments ( const char *path, _frag_append_t append_fragment, void *callback_data );

    void frag_init( FragList *ff, int maxnum );
    int  frag_append( FragList *ff, u32 offset, u32 sector, u32 count );
    int  _frag_append( void *ff, u32 offset, u32 sector, u32 count );
    int  frag_concat( FragList *ff, FragList *src );

// in case a sparse block is requested,
// the returned poffset might not be equal to requested offset
// the difference should be filled with 0
    int frag_get( FragList *ff, u32 offset, u32 count,
                  u32 *poffset, u32 *psector, u32 *pcount );

    int frag_remap( FragList *ff, FragList *log, FragList *phy );

    int get_frag_list( u8 *id );
    int set_frag_list( u8 *id );

#ifdef __cplusplus
}
#endif