[This is preliminary documentation and subject to change.]
The RTR_TOC_ENTRY structure describes an entry in the table of contents (TOC) of an RTR_INFO_BLOCK_HEADER.
typedef struct _RTR_TOC_ENTRY {
    ULONG    InfoType;
    ULONG    InfoSize;
    ULONG    Count;
    ULONG    Offset;
} RTR_TOC_ENTRY, *PRTR_TOC_ENTRY;