ckeditor5_image_upload in core/modules/ckeditor5/ckeditor5.pages.inc

Menu callback; Saves images uploaded via copy/paste into the editor.

ckeditor_image_upload in core/modules/ckeditor/ckeditor.pages.inc

Menu callback; Saves images uploaded via copy/paste into the editor.

form_example_tutorial_10_validate in modules/examples/form_example/form_example_tutorial.inc

Validate handler for form_example_tutorial_10().

user_validate_picture in core/modules/user/user.module

Validates an image uploaded by a user.

_file_test_form_submit in core/modules/simpletest/tests/file_test.module

Process the upload.

_image_field_default_image_validate in core/modules/image/image.field.inc

Element validation function for setting a default image.