unsigned char bytes[TCLFLEXARRAY];	/* The array of bytes. The actual size of this
				 * field depends on the 'allocated' field
				 * above. */
} ByteArray;

#define BYTEARRAY_MAX_LEN (TCL_SIZE_MAX - (Tcl_Size)offsetof(ByteArray, bytes))
#define BYTEARRAY_SIZE(len) \
        ( (len < 0 || BYTEARRAY_MAX_LEN < (len)) \
	? (Tcl_Panic("negative length specified or max size of a Tcl value exceeded"), 0) \
	: (offsetof(ByteArray, bytes) + (len)) )
#define GET_BYTEARRAY(irPtr) ((ByteArray *) (irPtr)->twoPtrValue.ptr1)
#define SET_BYTEARRAY(irPtr, baPtr) \
		(irPtr)->twoPtrValue.ptr1 = (baPtr)

int

 *----------------------------------------------------------------------
 */

unsigned char *
Tcl_SetByteArrayLength(
    Tcl_Obj *objPtr,		/* The ByteArray object. */
    Tcl_Size numBytes)		/* Number of bytes in resized array
                                 * Must be >= 0 */
{
    ByteArray *byteArrayPtr;
    Tcl_ObjInternalRep *irPtr;

    assert(numBytes >= 0);
    if (Tcl_IsShared(objPtr)) {
	Tcl_Panic("%s called with shared object", "Tcl_SetByteArrayLength");