I have some questions:

1. Why return an array of texts? Where do the texts get split up? At page boundaries? Column boundaries? At the end of each line? If a line is interrupted by a corner of an image and continues a couple of inches afterward, does it get treated as a separate text? (I once used a PDF->text extractor program that spit out every word sepearately, often in an incorrect order. That probably had to do with how the PDF was organized internally.)

2. "The PDF file should be smaller than 1 Mbit" -> You mean 1 megabyte, right? Because 1 megabit is only 125-128 kilobytes.