C# Class BitMiracle.LibJpeg.Classic.Internal.my_source_mgr

Fill the input buffer - called whenever buffer is emptied. In typical applications, this should read fresh data into the buffer (ignoring the current state of next_input_byte and bytes_in_buffer), reset the pointer and count to the start of the buffer, and return true indicating that the buffer has been reloaded. It is not necessary to fill the buffer entirely, only to obtain at least one more byte. There is no such thing as an EOF return. If the end of the file has been reached, the routine has a choice of ERREXIT() or inserting fake data into the buffer. In most cases, generating a warning message and inserting a fake EOI marker is the best course of action --- this will allow the decompressor to output however much of the image is there. However, the resulting error message is misleading if the real problem is an empty input file, so we handle that case specially. In applications that need to be able to suspend compression due to input not being available yet, a false return indicates that no more data can be obtained right now, but more may be forthcoming later. In this situation, the decompressor will return to its caller (with an indication of the number of scanlines it has read, if any). The application should resume decompression after it has loaded more data into the input buffer. Note that there are substantial restrictions on the use of suspension --- see the documentation. When suspending, the decompressor will back up to a convenient restart point (typically the start of the current MCU). next_input_byte and bytes_in_buffer indicate where the restart point will be if the current call returns false. Data beyond this point must be rescanned after resumption, so move it to the front of the buffer rather than discarding it.

Initialize source - called by jpeg_read_header before any data is actually read.