Detalle Del Ecm

ECM (Error Code Modeler) encode/decode utilities

Version 1.0

Copyright 2002 Neill Corlett

Distributed under the terms of the GNU GPL; read source code for details

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Introduction

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The ECM format allows you to reduce the size of a typical CD image file

(BIN, CDI, NRG, CCD, or any other format that uses raw sectors; results may

vary).

It works by eliminating the Error Correction/Detection Codes (ECC/EDC) from

each sector whenever possible. The encoder automatically adjusts to

different sector types and automatically skips any headers it encounters.

The results will vary depending on how much redundant ECC/EDC data is

present. Note that for "cooked" ISO files, there will be no reduction.

Setup / Usage

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Compile ecm.c and unecm.c if necessary, or use the included Win32 EXE files.

Run ECM with no parameters to see a simple usage reference:

usage: ecm cdimagefile [ecmfile]

Where "cdimagefile" is the name of the CD image file, and "ecmfile"

(optional) is the name of the ECM file. If you don't specify ecmfile, it

defaults to cdimagefile plus a .ecm suffix.

UNECM works the same way, but in reverse:

usage: unecm ecmfile [outputfile]

"ecmfile" must end in .ecm. If outputfile is not specified, it defaults

to ecmfile minus the .ecm suffix.

Thanks to

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ProtoCat for inspiring me to write this.

Where to find me

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email: corlett@lfx.org

www: http://lfx.org/~corlett/

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