python3.12/cpython/bytearrayobject.h

0001 #ifndef Py_CPYTHON_BYTEARRAYOBJECT_H
0002 #  error "this header file must not be included directly"
0003 #endif
0004
0005 /* Object layout */
0006 typedef struct {
0007     PyObject_VAR_HEAD
0008     Py_ssize_t ob_alloc;   /* How many bytes allocated in ob_bytes */
0009     char *ob_bytes;        /* Physical backing buffer */
0010     char *ob_start;        /* Logical start inside ob_bytes */
0011     Py_ssize_t ob_exports; /* How many buffer exports */
0012 } PyByteArrayObject;
0013
0014 PyAPI_DATA(char) _PyByteArray_empty_string[];
0015
0016 /* Macros and static inline functions, trading safety for speed */
0017 #define _PyByteArray_CAST(op) \
0018     (assert(PyByteArray_Check(op)), _Py_CAST(PyByteArrayObject*, op))
0019
0020 static inline char* PyByteArray_AS_STRING(PyObject *op)
0021 {
0022     PyByteArrayObject *self = _PyByteArray_CAST(op);
0023     if (Py_SIZE(self)) {
0024         return self->ob_start;
0025     }
0026     return _PyByteArray_empty_string;
0027 }
0028 #define PyByteArray_AS_STRING(self) PyByteArray_AS_STRING(_PyObject_CAST(self))
0029
0030 static inline Py_ssize_t PyByteArray_GET_SIZE(PyObject *op) {
0031     PyByteArrayObject *self = _PyByteArray_CAST(op);
0032     return Py_SIZE(self);
0033 }
0034 #define PyByteArray_GET_SIZE(self) PyByteArray_GET_SIZE(_PyObject_CAST(self))