File: /FPDI v1/pdf_context.php
0 = file | 1 = string
Make sure that there is at least one character beyond the current offset in the buffer.
To prevent the tokenizer from attempting to access data that does not exist.
Get the position in the file stream
Forcefully read more data into the buffer
Reset the position in the file stream.
Optionally move the file pointer to a new location and reset the buffered data.