read
Called by PSPDFKit to read data from the document. The returned byte array can be reused in subsequent calls to prevent excessive allocations.
Return
Byte array with document data of the exact same size or larger size than size parameter. Implementations may not return null or loading will fail. Instead, when experiencing a read error, implementations may return NO_DATA_AVAILABLE to safely stop reading.
Parameters
size
Size of the data chunk to be read in bytes.
offset
Offset from start of document of the data chunk to be read in bytes.