Module: Svn::Stream::C

Extended by:

FFI::Library

Defined in:

lib/svn/streams.rb

Constant Summary

ReadFromIO =

note: the SVN docs say that short reads indicate the end of the stream and short writes indicate an error. this means that we cannot use read_nonblock and write_nonblock, since they do not guarantee anything will happen.

FFI::Function.new(
    :pointer, [:pointer, :pointer, :pointer]
  ) do |io_ptr, out_buffer, in_out_len|

  # read the number of bytes requested and unwrap the io object
  bytes_to_read = in_out_len.read_int
  io = Svn::Utils.unwrap(io_ptr)

  # read the bytes from IO and write them to the pointer object
  bytes_read = io.read( bytes_to_read )
  out_buffer.write_string( bytes_read )

  # write the number of bytes read from io
  in_out_len.write_int( bytes_read.length )

  nil # return no error
end

WriteToIO =

FFI::Function.new(
    :pointer, [:pointer, :string, :pointer]
  ) do |io_ptr, in_string, in_out_len|

  # read the size of in_string and unwrap the io object
  bytes_to_write = in_out_len.read_int
  io = Svn::Utils.unwrap(io_ptr)

  # should we check that in_string isn't longer than in_out_len?
  bytes_written = io.write( in_string )

  # write the actual number of bytes written to io
  in_out_len.write_int( bytes_written )

  nil # return no error
end