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59 lines
2.6 KiB
C#
59 lines
2.6 KiB
C#
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/*
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* Copyright 2020 faddenSoft
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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using System;
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using System.Collections.Generic;
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namespace SourceGen.Tools.Omf {
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/// <summary>
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/// Apple IIgs OMF file.
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/// </summary>
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/// <remarks>
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/// References:
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/// - "Apple IIgs Programmer's Workshop Reference". Chapter 7, page 228, describes
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/// OMF v1.0 and v2.0.
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/// - "Apple IIgs GS/OS Reference, for GS/OS System Software Version 5.0 and later".
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/// Appendix F describes OMF v2.1, and Chapter 8 has some useful information about
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/// how the loader works.
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/// - "Undocumented Secrets of the Apple IIGS System Loader" by Neil Parker,
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/// http://nparker.llx.com/a2/loader.html . Among other things it documents ExpressLoad
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/// segments, something Apple apparently never did.
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/// - Apple IIgs Tech Note #66, "ExpressLoad Philosophy".
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///
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/// Related:
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/// - https://www.brutaldeluxe.fr/products/crossdevtools/omfanalyzer/
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/// - https://github.com/fadden/ciderpress/blob/master/reformat/Disasm.cpp
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/// </remarks>
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public class OmfFile {
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public const int MIN_FILE_SIZE = 37; // can't be smaller than v0 segment hdr
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public const int MAX_FILE_SIZE = (1 << 24) - 1; // cap it at 16MB
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// TODO:
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// - has an overall file type (load, object, RTL)
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// - determine with a prioritized series of "could this be ____" checks
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// - holds list of OmfSegment
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// - has a list of warnings and errors that arose during parsing
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// - holds on to byte[] with data
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// OmfSegment:
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// - header (common data, plus name/value dict with version-specific fields for display)
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// - ref back to OmfFile for byte[] access?
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// - list of OmfRecord
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// - file-type-specific stuff can be generated and cached in second pass, e.g.
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// generate a full relocation dictionary for load files (can't do this until we
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// know the overall file type, which we can't know until all segments have been
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// processed a bit)
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}
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}
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