1  #ifndef Py_CPYTHON_BYTEARRAYOBJECT_H
       2  #  error "this header file must not be included directly"
       3  #endif
       4  
       5  /* Object layout */
       6  typedef struct {
       7      PyObject_VAR_HEAD
       8      Py_ssize_t ob_alloc;   /* How many bytes allocated in ob_bytes */
       9      char *ob_bytes;        /* Physical backing buffer */
      10      char *ob_start;        /* Logical start inside ob_bytes */
      11      Py_ssize_t ob_exports; /* How many buffer exports */
      12  } PyByteArrayObject;
      13  
      14  PyAPI_DATA(char) _PyByteArray_empty_string[];
      15  
      16  /* Macros and static inline functions, trading safety for speed */
      17  #define _PyByteArray_CAST(op) \
      18      (assert(PyByteArray_Check(op)), _Py_CAST(PyByteArrayObject*, op))
      19  
      20  static inline char* PyByteArray_AS_STRING(PyObject *op)
      21  {
      22      PyByteArrayObject *self = _PyByteArray_CAST(op);
      23      if (Py_SIZE(self)) {
      24          return self->ob_start;
      25      }
      26      return _PyByteArray_empty_string;
      27  }
      28  #if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 < 0x030b0000
      29  #  define PyByteArray_AS_STRING(self) PyByteArray_AS_STRING(_PyObject_CAST(self))
      30  #endif
      31  
      32  static inline Py_ssize_t PyByteArray_GET_SIZE(PyObject *op) {
      33      PyByteArrayObject *self = _PyByteArray_CAST(op);
      34      return Py_SIZE(self);
      35  }
      36  #if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 < 0x030b0000
      37  #  define PyByteArray_GET_SIZE(self) PyByteArray_GET_SIZE(_PyObject_CAST(self))
      38  #endif