gh-155742: Use PyBytesWriter in bytes.translate()

Replace soft deprecated _PyBytes_Resize() with PyBytesWriter.

Author: vstinner

Objects/bytesobject.c

@@ -2275,7 +2275,6 @@ bytes_translate_impl(PyBytesObject *self, PyObject *table,
     PyObject *input_obj = (PyObject*)self;
     const char *output_start, *del_table_chars=NULL;
     Py_ssize_t inlen, tablen, dellen = 0;
-    PyObject *result;
     int trans_table[256];
 
     if (PyBytes_Check(table)) {
@@ -2320,13 +2319,13 @@ bytes_translate_impl(PyBytesObject *self, PyObject *table,
     }
 
     inlen = PyBytes_GET_SIZE(input_obj);
-    result = PyBytes_FromStringAndSize((char *)NULL, inlen);
-    if (result == NULL) {
+    PyBytesWriter *writer = PyBytesWriter_Create(inlen);
+    if (writer == NULL) {
         PyBuffer_Release(&del_table_view);
         PyBuffer_Release(&table_view);
         return NULL;
     }
-    output_start = output = PyBytes_AS_STRING(result);
+    output_start = output = PyBytesWriter_GetData(writer);
     input = PyBytes_AS_STRING(input_obj);
 
     if (dellen == 0 && table_chars != NULL) {
@@ -2335,14 +2334,17 @@ bytes_translate_impl(PyBytesObject *self, PyObject *table,
             c = Py_CHARMASK(*input++);
             *output++ = table_chars[c];
         }
+        PyObject *result = PyBytesWriter_Finish(writer);
+
         /* Check if anything changed (for returning original object) */
         /* We save this check until the end so that the compiler will */
         /* unroll the loop above leading to MUCH faster code. */
-        if (PyBytes_CheckExact(input_obj)) {
+        if (result != NULL && PyBytes_CheckExact(input_obj)) {
             if (memcmp(PyBytes_AS_STRING(input_obj), output_start, inlen) == 0) {
                 Py_SETREF(result, Py_NewRef(input_obj));
             }
         }
+
         PyBuffer_Release(&del_table_view);
         PyBuffer_Release(&table_view);
         return result;
@@ -2369,13 +2371,11 @@ bytes_translate_impl(PyBytesObject *self, PyObject *table,
         changed = 1;
     }
     if (!changed && PyBytes_CheckExact(input_obj)) {
-        Py_DECREF(result);
+        PyBytesWriter_Discard(writer);
         return Py_NewRef(input_obj);
     }
     /* Fix the size of the resulting byte string */
-    if (inlen > 0)
-        _PyBytes_Resize(&result, output - output_start);
-    return result;
+    return PyBytesWriter_FinishWithPointer(writer, output);
 }