id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
19036	Big base64-encoded files uploading	anthony@…	nobody	"I'm trying to upload image file using ajax & browser FileReader.readAsDataURL API. In most cases it fails with `MultiPartParserError: Could not decode base64 data: Error('Incorrect padding',).`
When django cut of header from 'multipart/form-data' part with encoded file data, it does not check length of the remaining data and pass it to decoder. Length of passed data is `(FileUploadHandler chunk size) - (removed header length)` which is not divides by 4 in most cases.
It is reproduced by testcase I attached. It is based on standard Django test_base64_upload test but reads 512Kb from /dev/urandom instead of short string."	Bug	closed	File uploads/storage	dev	Release blocker	fixed			Ready for checkin	1	0	0	0	0	0