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Acorn Object Library Format v1

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Description: Historical document defining a file format called ARM Object Library Format, which is used by language processors for ARM-based systems.
T E C H N I C A L M E M O R A N D U M Subject: Acorn Library Format / Object Library Format Reference: PLG-ALF Issue: 0.02/proto-1.00 Author: Lee Smith, 2nd February 1989 Distribution: Not restricted. ----------------------------------------------------------------------------- Programming Languages Group, Acorn Computers Limited, Fulbourn Road, Cherry Hinton, Cambridge, CB1 4JN, England. ----------------------------------------------------------------------------- Copyright Acorn Computers Limited 1989 Neither the whole nor any part of the information contained in this technical memorandum may be adapted or reproduced in any material form except with the prior written approval of Acorn Computers Limited (Acorn). The information contained in this technical memorandum relates to ongoing developments. Whilst it is given in good faith by Acorn, it is acknowledged that there may be errors or omissions. H I S T O R Y 26-Oct-88 First written. 02-Feb-89 Minor editing and revision; added description of 'old-style' libraries; added description of chunk files (from PLG-AOF); merged in description of Object Library Format; Introduction ============ A library file contains a number of separate but related pieces of data. In order to simplify access to these data, and to provide for a degree of extensibility, the library file format is itself layered on another format called "Chunk File Format", which provides a simple and efficient means of accessing and updating distinct chunks of data within a single file. The library file format defines four chunks: "Directory", "Time-stamp", "Version" and "Data". There may be many "Data" chunks in a library. The minimum size of a piece of data in both formats is four bytes or one word. Each word is stored in a file in "litle-endian" format; that is the least significant byte of the word is stored first. Chunk File Format ================= A chunk is accessed via a header at the start of the file. The header c
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