#define IMAGE_DYNAMIC_RELOCATION_FUNCTION_OVERRIDE              0x00000007

typedef struct _IMAGE_FUNCTION_OVERRIDE_HEADER {
    DWORD FuncOverrideSize;
 // IMAGE_FUNCTION_OVERRIDE_DYNAMIC_RELOCATION  FuncOverrideInfo[ANYSIZE_ARRAY]; // FuncOverrideSize bytes in size
 // IMAGE_BDD_INFO BDDInfo; // BDD region, size in bytes: DVRTEntrySize - sizeof(IMAGE_FUNCTION_OVERRIDE_HEADER) - FuncOverrideSize
} IMAGE_FUNCTION_OVERRIDE_HEADER;
typedef IMAGE_FUNCTION_OVERRIDE_HEADER UNALIGNED * PIMAGE_FUNCTION_OVERRIDE_HEADER;

typedef struct _IMAGE_FUNCTION_OVERRIDE_DYNAMIC_RELOCATION {
    DWORD OriginalRva;          // RVA of original function
    DWORD BDDOffset;            // Offset into the BDD region
    DWORD RvaSize;              // Size in bytes taken by RVAs. Must be multiple of sizeof(DWORD).
    DWORD BaseRelocSize;        // Size in bytes taken by BaseRelocs

    // DWORD RVAs[RvaSize / sizeof(DWORD)];     // Array containing overriding func RVAs. 

    // IMAGE_BASE_RELOCATION  BaseRelocs[ANYSIZE_ARRAY]; // Base relocations (RVA + Size + TO)
                                                         //  Padded with extra TOs for 4B alignment
                                                         // BaseRelocSize size in bytes
} IMAGE_FUNCTION_OVERRIDE_DYNAMIC_RELOCATION;
typedef IMAGE_FUNCTION_OVERRIDE_DYNAMIC_RELOCATION * PIMAGE_FUNCTION_OVERRIDE_DYNAMIC_RELOCATION;

typedef struct _IMAGE_BDD_INFO {
    DWORD         Version;      // decides the semantics of serialized BDD
    DWORD         BDDSize;
    // IMAGE_BDD_DYNAMIC_RELOCATION BDDNodes[ANYSIZE_ARRAY]; // BDDSize size in bytes.
} IMAGE_BDD_INFO;
typedef IMAGE_BDD_INFO * PIMAGE_BDD_INFO;

typedef struct _IMAGE_BDD_DYNAMIC_RELOCATION {
    WORD   Left;                // Index of FALSE edge in BDD array
    WORD   Right;               // Index of TRUE edge in BDD array
    DWORD  Value;               // Either FeatureNumber or Index into RVAs array
} IMAGE_BDD_DYNAMIC_RELOCATION;
typedef IMAGE_BDD_DYNAMIC_RELOCATION * PIMAGE_BDD_DYNAMIC_RELOCATION;

// Function override relocation types in DVRT records.

#define IMAGE_FUNCTION_OVERRIDE_INVALID         0
#define IMAGE_FUNCTION_OVERRIDE_X64_REL32       1  // 32-bit relative address from byte following reloc
#define IMAGE_FUNCTION_OVERRIDE_ARM64_BRANCH26  2  // 26 bit offset << 2 & sign ext. for B & BL
#define IMAGE_FUNCTION_OVERRIDE_ARM64_THUNK     3