# Table of contents

| File                                                                               | Purpose                                                         |
|------------------------------------------------------------------------------------|-----------------------------------------------------------------|
| [bitfields.d](https://github.com/dlang/dmd/blob/master/compiler/src/dmd/common/bitfields.d) | Pack multiple boolean fields into bit fields                    |
| [file.d](https://github.com/dlang/dmd/blob/master/compiler/src/dmd/common/file.d)           | Functions and objects dedicated to file I/O and management      |
| [outbuffer.d](https://github.com/dlang/dmd/blob/master/compiler/src/dmd/common/outbuffer.d) | An expandable buffer in which you can write text or binary data |
| [string.d](https://github.com/dlang/dmd/blob/master/compiler/src/dmd/common/string.d)       | Common string functions including filename manipulation         |