sys::MemoryFileStore

sys::Obj
  sys::Virtual
    sys::FileStore
      sys::MemoryFileStore

A file store implementation where the file contents are backed by an in- memory byte[]. The memory file is modeled by a MemoryFile object. When a sys::File is opened by this file store, the "fp" field of the File will be assigned to a MemoryFile. Therefore, any open memory file can be accessed by casting the fp field of the sys::File to a MemoryFile. Sub-classes must implement the following abstract methods:

   int getMemorySize(File f)
   bool openMemoryFile(MemoryFile m)

close

public override bool close(File f)

flush

public virtual override void flush(File f)

getMemorySize

public abstract int getMemorySize(File f)

Return the size of the memory buffer back the file represented by "f".

open

public override bool open(File f, Str mode)

openMemoryFile

public abstract bool openMemoryFile(MemoryFile m)

Given a MemoryFile, the implementation must set the mem byte[] to point to the contents being backed by the memory file. Pre-Condition: all fields of the MemoryFile are initialized except for the mem field. return true on success, false on error.

read

public virtual override int read(File f)

readBytes

public virtual override int readBytes(File f, byte[] b, int off, int len)

seek

public virtual override bool seek(File f, int pos)

size

public override int size(File f)

Must be implemented by getMemorySize(File f)

tell

public virtual override int tell(File f)

write

public virtual override bool write(File f, int b)

writeBytes

public virtual override bool writeBytes(File f, byte[] b, int off, int len)