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buffer-ports
  1. Outdated egg!
  2. buffer-ports
  3. Introduction
    1. open-input-buffer
    2. open-output-buffer
    3. open-memory-mapped-input-file
  4. Authors
  5. Version history
  6. License

Introduction

This extensions allows creating input- and output ports over arbitrary memory buffers like strings, blobs and SRFI-4 number vectors, both in normal garbage collected and memory and in the permanent (static) heap. Ports can also be created on foreign pointer objects, locatives and memory mapped files.

open-input-buffer

[procedure] (open-input-buffer THING [LENGTH [START]])

Creates and returns an input port. THING may be a string, blob, SRFI-4 number vector, foreign pointer, memory mapped file or locative. Reading from the port will read the contents of the data area designated by THING. The option LENGTH and START arguments can be used to limit the length of the data and the starting position.

If THING is a pointer, locative or memory mapped file, then LENGTH must be specified and will not be checked for being valid.

open-output-buffer

[procedure] (open-output-buffer THING [LENGTH [START]])

Returns an output-port over the object THING. Otherwise similar to open-input-buffer.

open-memory-mapped-input-file

[procedure] (open-memory-mapped-input-file FILENAME)

A convenience function for opening a file in a memory-mapped buffer. On Windows, this procedure is equivalent to open-input-file.

Authors

/users/felix winkelmann

Version history
0.6
small improvements in the test suite
0.2
removed optional args from open-memory-mapped-input-file
0.1
initial release

License

 
Copyright (c) 2011, Felix L. Winkelmann
All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following
conditions are met:

  Redistributions of source code must retain the above copyright notice, this list of conditions and the following
    disclaimer. 
  Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following
    disclaimer in the documentation and/or other materials provided with the distribution. 
  Neither the name of the author nor the names of its contributors may be used to endorse or promote
    products derived from this software without specific prior written permission. 

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.