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Started sketching out support for the G64 file format.

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This commit is contained in:
Thomas Harte 2016-07-10 10:17:53 -04:00
parent 9e3d6b762b
commit ff49857f5c
3 changed files with 146 additions and 0 deletions
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14
OSBindings/Mac/Clock Signal.xcodeproj/project.pbxproj
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@ -43,6 +43,7 @@
4B73C71D1D036C030074D992 /* Vic20Document.xib in Resources */ = {isa = PBXBuildFile; fileRef = 4B73C71B1D036C030074D992 /* Vic20Document.xib */; };
4B92EACA1B7C112B00246143 /* 6502TimingTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4B92EAC91B7C112B00246143 /* 6502TimingTests.swift */; };
4BAB62AD1D3272D200DF5BA0 /* Disk.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 4BAB62AB1D3272D200DF5BA0 /* Disk.cpp */; };
4BAB62B51D327F7E00DF5BA0 /* G64.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 4BAB62B31D327F7E00DF5BA0 /* G64.cpp */; };
4BB298EE1B587D8400A49093 /* 6502_functional_test.bin in Resources */ = {isa = PBXBuildFile; fileRef = 4BB297E01B587D8300A49093 /* 6502_functional_test.bin */; };
4BB298EF1B587D8400A49093 /* AllSuiteA.bin in Resources */ = {isa = PBXBuildFile; fileRef = 4BB297E11B587D8300A49093 /* AllSuiteA.bin */; };
4BB298F11B587D8400A49093 /* start in Resources */ = {isa = PBXBuildFile; fileRef = 4BB297E51B587D8300A49093 /* start */; };
@ -419,6 +420,8 @@
4BAB62AB1D3272D200DF5BA0 /* Disk.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = Disk.cpp; sourceTree = "<group>"; };
4BAB62AC1D3272D200DF5BA0 /* Disk.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; path = Disk.hpp; sourceTree = "<group>"; };
4BAB62AE1D32730D00DF5BA0 /* Storage.hpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.h; path = Storage.hpp; sourceTree = "<group>"; };
4BAB62B31D327F7E00DF5BA0 /* G64.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = G64.cpp; sourceTree = "<group>"; };
4BAB62B41D327F7E00DF5BA0 /* G64.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; path = G64.hpp; sourceTree = "<group>"; };
4BB297E01B587D8300A49093 /* 6502_functional_test.bin */ = {isa = PBXFileReference; lastKnownFileType = archive.macbinary; path = 6502_functional_test.bin; sourceTree = "<group>"; };
4BB297E11B587D8300A49093 /* AllSuiteA.bin */ = {isa = PBXFileReference; lastKnownFileType = archive.macbinary; path = AllSuiteA.bin; sourceTree = "<group>"; };
4BB297E51B587D8300A49093 /* start */ = {isa = PBXFileReference; lastKnownFileType = file; path = " start"; sourceTree = "<group>"; };
@ -978,12 +981,22 @@
4BAB62AA1D3272D200DF5BA0 /* Disk */ = {
isa = PBXGroup;
children = (
4BAB62B21D327F7E00DF5BA0 /* Formats */,
4BAB62AB1D3272D200DF5BA0 /* Disk.cpp */,
4BAB62AC1D3272D200DF5BA0 /* Disk.hpp */,
);
path = Disk;
sourceTree = "<group>";
};
4BAB62B21D327F7E00DF5BA0 /* Formats */ = {
isa = PBXGroup;
children = (
4BAB62B31D327F7E00DF5BA0 /* G64.cpp */,
4BAB62B41D327F7E00DF5BA0 /* G64.hpp */,
);
path = Formats;
sourceTree = "<group>";
};
4BB297E41B587D8300A49093 /* Wolfgang Lorenz 6502 test suite */ = {
isa = PBXGroup;
children = (
@ -1850,6 +1863,7 @@
4B2A53A11D117D36003C6002 /* CSAtari2600.mm in Sources */,
4B69FB441C4D941400B5F0AA /* TapeUEF.cpp in Sources */,
4B4DC8211D2C2425003C5BF8 /* Vic20.cpp in Sources */,
4BAB62B51D327F7E00DF5BA0 /* G64.cpp in Sources */,
4BBF99141C8FBA6F0075DAFB /* CRTInputBufferBuilder.cpp in Sources */,
4B2409551C45AB05004DA684 /* Speaker.cpp in Sources */,
4B4DC8281D2C2470003C5BF8 /* C1540.cpp in Sources */,

91
Storage/Disk/Formats/G64.cpp Normal file
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@ -0,0 +1,91 @@
//
// G64.cpp
// Clock Signal
//
// Created by Thomas Harte on 10/07/2016.
// Copyright © 2016 Thomas Harte. All rights reserved.
//
#include "G64.hpp"
using namespace Storage;
G64::G64(const char *file_name)
{
_file = fopen(file_name, "rb");
if(!_file)
throw ErrorNotGCR;
// read and check the file signature
char signature[8];
if(fread(signature, 1, 8, _file) != 12)
throw ErrorNotGCR;
if(memcmp(signature, "GCR-1541", 8))
throw ErrorNotGCR;
// check the version number
int version = fgetc(_file);
if(version != 0)
{
throw ErrorUnknownVersion;
}
// get the number of tracks and track size
_number_of_tracks = (uint8_t)fgetc(_file);
_maximum_track_size = (uint16_t)fgetc(_file);
_maximum_track_size |= (uint16_t)fgetc(_file) << 8;
}
G64::~G64()
{
if(_file) fclose(_file);
}
unsigned int G64::get_head_position_count()
{
// give at least 84 tracks, to yield the normal geometry but,
// if there are more, shove them in
return _number_of_tracks > 84 ? _number_of_tracks : 84;
}
std::shared_ptr<Track> G64::get_track_at_position(unsigned int position)
{
std::shared_ptr<Track> resulting_track;
// if there's definitely no track here, return the empty track
// (TODO: should be supplying one with an index hole?)
if(position >= _number_of_tracks) return resulting_track;
// seek to this track's entry in the track table
fseek(_file, SEEK_SET, (int)((position * 4) + 0xc));
// read the track offset
uint32_t track_offset;
track_offset = (uint32_t)fgetc(_file);
track_offset |= (uint32_t)fgetc(_file) << 8;
track_offset |= (uint32_t)fgetc(_file) << 16;
track_offset |= (uint32_t)fgetc(_file) << 24;
// if the track offset is zero, this track doesn't exist, so...
if(!track_offset) return resulting_track;
// seek to the track start
fseek(_file, SEEK_SET, (int)track_offset);
// get the real track length
uint16_t track_length;
track_length = (uint16_t)fgetc(_file);
track_length |= (uint16_t)fgetc(_file) << 8;
// grab the byte contents of this track
uint8_t track_contents[track_length];
fread(track_contents, 1, track_length, _file);
// check for speed-zone contents
// TODO: package track_contents and speed_zones into a PCM track
return resulting_track;
}

41
Storage/Disk/Formats/G64.hpp Normal file
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@ -0,0 +1,41 @@
//
// G64.hpp
// Clock Signal
//
// Created by Thomas Harte on 10/07/2016.
// Copyright © 2016 Thomas Harte. All rights reserved.
//
#ifndef G64_hpp
#define G64_hpp
#include "../Disk.hpp"
namespace Storage {
class PCMTrack: public Track {
};
class G64: public Disk {
public:
G64(const char *file_name);
~G64();
enum {
ErrorNotGCR,
ErrorUnknownVersion
};
unsigned int get_head_position_count();
std::shared_ptr<Track> get_track_at_position(unsigned int position);
private:
FILE *_file;
uint8_t _number_of_tracks;
uint16_t _maximum_track_size;
};
};
#endif /* G64_hpp */