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Aaru.Server/DiscImageChef.DiscImages/DiskCopy42.cs

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// /***************************************************************************
// The Disc Image Chef
// ----------------------------------------------------------------------------
//
// Filename : DiskCopy42.cs
// Author(s) : Natalia Portillo <claunia@claunia.com>
//
// Component : Disc image plugins.
//
// --[ Description ] ----------------------------------------------------------
//
// Manages Apple DiskCopy 4.2 disc images, including unofficial modifications.
//
// --[ License ] --------------------------------------------------------------
//
// This library is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation; either version 2.1 of the
// License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, see <http://www.gnu.org/licenses/>.
//
// ----------------------------------------------------------------------------
// Copyright © 2011-2017 Natalia Portillo
// ****************************************************************************/
using System;
using System.Collections.Generic;
using System.IO;
using System.Text.RegularExpressions;
using Claunia.RsrcFork;
using DiscImageChef.CommonTypes;
using DiscImageChef.Console;
using DiscImageChef.Filters;
namespace DiscImageChef.ImagePlugins
{
// Checked using several images and strings inside Apple's DiskImages.framework
class DiskCopy42 : ImagePlugin
{
#region Internal Structures
// DiskCopy 4.2 header, big-endian, data-fork, start of file, 84 bytes
struct DC42Header
{
/// <summary>0x00, 64 bytes, pascal string, disk name or "-not a Macintosh disk-", filled with garbage</summary>
public string diskName;
/// <summary>0x40, size of data in bytes (usually sectors*512)</summary>
public uint dataSize;
/// <summary>0x44, size of tags in bytes (usually sectors*12)</summary>
public uint tagSize;
/// <summary>0x48, checksum of data bytes</summary>
public uint dataChecksum;
/// <summary>0x4C, checksum of tag bytes</summary>
public uint tagChecksum;
/// <summary>0x50, format of disk, see constants</summary>
public byte format;
/// <summary>0x51, format of sectors, see constants</summary>
public byte fmtByte;
/// <summary>0x52, is disk image valid? always 0x01</summary>
public byte valid;
/// <summary>0x53, reserved, always 0x00</summary>
public byte reserved;
}
#endregion
#region Internal Constants
// format byte
/// <summary>3.5", single side, double density, GCR</summary>
const byte kSonyFormat400K = 0x00;
/// <summary>3.5", double side, double density, GCR</summary>
const byte kSonyFormat800K = 0x01;
/// <summary>3.5", double side, double density, MFM</summary>
const byte kSonyFormat720K = 0x02;
/// <summary>3.5", double side, high density, MFM</summary>
const byte kSonyFormat1440K = 0x03;
/// <summary>3.5", double side, high density, MFM, 21 sectors/track (aka, Microsoft DMF)
// Unchecked value</summary>
const byte kSonyFormat1680K = 0x04;
/// <summary>Defined by Sigma Seven's BLU</summary>
const byte kSigmaFormatTwiggy = 0x54;
/// <summary>Defined by LisaEm</summary>
const byte kNotStandardFormat = 0x5D;
// There should be a value for Apple HD20 hard disks, unknown...
// fmyByte byte
// Based on GCR nibble
// Always 0x02 for MFM disks
// Unknown for Apple HD20
/// <summary>Defined by Sigma Seven's BLU</summary>
const byte kSigmaFmtByteTwiggy = 0x01;
/// <summary>3.5" single side double density GCR and MFM all use same code</summary>
const byte kSonyFmtByte400K = 0x02;
const byte kSonyFmtByte720K = kSonyFmtByte400K;
const byte kSonyFmtByte1440K = kSonyFmtByte400K;
const byte kSonyFmtByte1680K = kSonyFmtByte400K;
/// <summary>3.5" double side double density GCR, 512 bytes/sector, interleave 2:1</summary>
const byte kSonyFmtByte800K = 0x22;
/// <summary>3.5" double side double density GCR, 512 bytes/sector, interleave 2:1, incorrect value (but appears on official documentation)</summary>
const byte kSonyFmtByte800KIncorrect = 0x12;
/// <summary>3.5" double side double density GCR, ProDOS format, interleave 4:1</summary>
const byte kSonyFmtByteProDos = 0x24;
/// <summary>Unformatted sectors</summary>
const byte kInvalidFmtByte = 0x96;
/// <summary>Defined by LisaEm</summary>
const byte kFmtNotStandard = 0x93;
#endregion
#region Internal variables
/// <summary>Start of data sectors in disk image, should be 0x58</summary>
uint dataOffset;
/// <summary>Start of tags in disk image, after data sectors</summary>
uint tagOffset;
/// <summary>Bytes per tag, should be 12</summary>
uint bptag;
/// <summary>Header of opened image</summary>
DC42Header header;
/// <summary>Disk image file</summary>
Filter dc42ImageFilter;
byte[] twiggyCache;
byte[] twiggyCacheTags;
bool twiggy;
#endregion
public DiskCopy42()
{
Name = "Apple DiskCopy 4.2";
PluginUUID = new Guid("0240B7B1-E959-4CDC-B0BD-386D6E467B88");
ImageInfo = new ImageInfo();
ImageInfo.readableSectorTags = new List<SectorTagType>();
ImageInfo.readableMediaTags = new List<MediaTagType>();
ImageInfo.imageHasPartitions = false;
ImageInfo.imageHasSessions = false;
ImageInfo.imageVersion = "4.2";
ImageInfo.imageApplication = "Apple DiskCopy";
ImageInfo.imageApplicationVersion = "4.2";
ImageInfo.imageCreator = null;
ImageInfo.imageComments = null;
ImageInfo.mediaManufacturer = null;
ImageInfo.mediaModel = null;
ImageInfo.mediaSerialNumber = null;
ImageInfo.mediaBarcode = null;
ImageInfo.mediaPartNumber = null;
ImageInfo.mediaSequence = 0;
ImageInfo.lastMediaSequence = 0;
ImageInfo.driveManufacturer = null;
ImageInfo.driveModel = null;
ImageInfo.driveSerialNumber = null;
ImageInfo.driveFirmwareRevision = null;
}
public override bool IdentifyImage(Filter imageFilter)
{
Stream stream = imageFilter.GetDataForkStream();
stream.Seek(0, SeekOrigin.Begin);
byte[] buffer = new byte[0x58];
byte[] pString = new byte[64];
stream.Read(buffer, 0, 0x58);
// Incorrect pascal string length, not DC42
if(buffer[0] > 63)
return false;
DC42Header tmp_header = new DC42Header();
Array.Copy(buffer, 0, pString, 0, 64);
BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
tmp_header.diskName = StringHandlers.PascalToString(pString);
tmp_header.dataSize = BigEndianBitConverter.ToUInt32(buffer, 0x40);
tmp_header.tagSize = BigEndianBitConverter.ToUInt32(buffer, 0x44);
tmp_header.dataChecksum = BigEndianBitConverter.ToUInt32(buffer, 0x48);
tmp_header.tagChecksum = BigEndianBitConverter.ToUInt32(buffer, 0x4C);
tmp_header.format = buffer[0x50];
tmp_header.fmtByte = buffer[0x51];
tmp_header.valid = buffer[0x52];
tmp_header.reserved = buffer[0x53];
DicConsole.DebugWriteLine("DC42 plugin", "tmp_header.diskName = \"{0}\"", tmp_header.diskName);
DicConsole.DebugWriteLine("DC42 plugin", "tmp_header.dataSize = {0} bytes", tmp_header.dataSize);
DicConsole.DebugWriteLine("DC42 plugin", "tmp_header.tagSize = {0} bytes", tmp_header.tagSize);
DicConsole.DebugWriteLine("DC42 plugin", "tmp_header.dataChecksum = 0x{0:X8}", tmp_header.dataChecksum);
DicConsole.DebugWriteLine("DC42 plugin", "tmp_header.tagChecksum = 0x{0:X8}", tmp_header.tagChecksum);
DicConsole.DebugWriteLine("DC42 plugin", "tmp_header.format = 0x{0:X2}", tmp_header.format);
DicConsole.DebugWriteLine("DC42 plugin", "tmp_header.fmtByte = 0x{0:X2}", tmp_header.fmtByte);
DicConsole.DebugWriteLine("DC42 plugin", "tmp_header.valid = {0}", tmp_header.valid);
DicConsole.DebugWriteLine("DC42 plugin", "tmp_header.reserved = {0}", tmp_header.reserved);
if(tmp_header.valid != 1 || tmp_header.reserved != 0)
return false;
if(tmp_header.dataSize + tmp_header.tagSize + 0x54 != imageFilter.GetDataForkLength() && tmp_header.format != kSigmaFormatTwiggy)
return false;
if(tmp_header.format != kSonyFormat400K && tmp_header.format != kSonyFormat800K && tmp_header.format != kSonyFormat720K &&
tmp_header.format != kSonyFormat1440K && tmp_header.format != kSonyFormat1680K && tmp_header.format != kSigmaFormatTwiggy &&
tmp_header.format != kNotStandardFormat)
{
DicConsole.DebugWriteLine("DC42 plugin", "Unknown tmp_header.format = 0x{0:X2} value", tmp_header.format);
return false;
}
if(tmp_header.fmtByte != kSonyFmtByte400K && tmp_header.fmtByte != kSonyFmtByte800K && tmp_header.fmtByte != kSonyFmtByte800KIncorrect &&
tmp_header.fmtByte != kSonyFmtByteProDos && tmp_header.fmtByte != kInvalidFmtByte && tmp_header.fmtByte != kSigmaFmtByteTwiggy &&
tmp_header.fmtByte != kFmtNotStandard)
{
DicConsole.DebugWriteLine("DC42 plugin", "Unknown tmp_header.fmtByte = 0x{0:X2} value", tmp_header.fmtByte);
return false;
}
if(tmp_header.fmtByte == kInvalidFmtByte)
{
DicConsole.DebugWriteLine("DC42 plugin", "Image says it's unformatted");
return false;
}
return true;
}
public override bool OpenImage(Filter imageFilter)
{
Stream stream = imageFilter.GetDataForkStream();
stream.Seek(0, SeekOrigin.Begin);
byte[] buffer = new byte[0x58];
byte[] pString = new byte[64];
stream.Read(buffer, 0, 0x58);
// Incorrect pascal string length, not DC42
if(buffer[0] > 63)
return false;
header = new DC42Header();
BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
Array.Copy(buffer, 0, pString, 0, 64);
header.diskName = StringHandlers.PascalToString(pString);
header.dataSize = BigEndianBitConverter.ToUInt32(buffer, 0x40);
header.tagSize = BigEndianBitConverter.ToUInt32(buffer, 0x44);
header.dataChecksum = BigEndianBitConverter.ToUInt32(buffer, 0x48);
header.tagChecksum = BigEndianBitConverter.ToUInt32(buffer, 0x4C);
header.format = buffer[0x50];
header.fmtByte = buffer[0x51];
header.valid = buffer[0x52];
header.reserved = buffer[0x53];
DicConsole.DebugWriteLine("DC42 plugin", "header.diskName = \"{0}\"", header.diskName);
DicConsole.DebugWriteLine("DC42 plugin", "header.dataSize = {0} bytes", header.dataSize);
DicConsole.DebugWriteLine("DC42 plugin", "header.tagSize = {0} bytes", header.tagSize);
DicConsole.DebugWriteLine("DC42 plugin", "header.dataChecksum = 0x{0:X8}", header.dataChecksum);
DicConsole.DebugWriteLine("DC42 plugin", "header.tagChecksum = 0x{0:X8}", header.tagChecksum);
DicConsole.DebugWriteLine("DC42 plugin", "header.format = 0x{0:X2}", header.format);
DicConsole.DebugWriteLine("DC42 plugin", "header.fmtByte = 0x{0:X2}", header.fmtByte);
DicConsole.DebugWriteLine("DC42 plugin", "header.valid = {0}", header.valid);
DicConsole.DebugWriteLine("DC42 plugin", "header.reserved = {0}", header.reserved);
if(header.valid != 1 || header.reserved != 0)
return false;
if(header.dataSize + header.tagSize + 0x54 != imageFilter.GetDataForkLength() && header.format != kSigmaFormatTwiggy)
return false;
if(header.format != kSonyFormat400K && header.format != kSonyFormat800K && header.format != kSonyFormat720K &&
header.format != kSonyFormat1440K && header.format != kSonyFormat1680K && header.format != kSigmaFormatTwiggy && header.format != kNotStandardFormat)
{
DicConsole.DebugWriteLine("DC42 plugin", "Unknown header.format = 0x{0:X2} value", header.format);
return false;
}
if(header.fmtByte != kSonyFmtByte400K && header.fmtByte != kSonyFmtByte800K && header.fmtByte != kSonyFmtByte800KIncorrect &&
header.fmtByte != kSonyFmtByteProDos && header.fmtByte != kInvalidFmtByte && header.fmtByte != kSigmaFmtByteTwiggy && header.fmtByte != kFmtNotStandard)
{
DicConsole.DebugWriteLine("DC42 plugin", "Unknown tmp_header.fmtByte = 0x{0:X2} value", header.fmtByte);
return false;
}
if(header.fmtByte == kInvalidFmtByte)
{
DicConsole.DebugWriteLine("DC42 plugin", "Image says it's unformatted");
return false;
}
dataOffset = 0x54;
tagOffset = header.tagSize != 0 ? 0x54 + header.dataSize : 0;
ImageInfo.sectorSize = 512;
bptag = (uint)(header.tagSize != 0 ? 12 : 0);
dc42ImageFilter = imageFilter;
ImageInfo.sectors = header.dataSize / 512;
if(header.tagSize != 0)
{
bptag = (uint)(header.tagSize / ImageInfo.sectors);
DicConsole.DebugWriteLine("DC42 plugin", "bptag = {0} bytes", bptag);
if(bptag != 12 && bptag != 20 && bptag != 24)
{
DicConsole.DebugWriteLine("DC42 plugin", "Unknown tag size");
return false;
}
ImageInfo.readableSectorTags.Add(SectorTagType.AppleSectorTag);
}
ImageInfo.imageSize = ImageInfo.sectors * ImageInfo.sectorSize + ImageInfo.sectors * bptag;
ImageInfo.imageCreationTime = imageFilter.GetCreationTime();
ImageInfo.imageLastModificationTime = imageFilter.GetLastWriteTime();
ImageInfo.imageName = header.diskName;
switch(header.format)
{
case kSonyFormat400K:
ImageInfo.mediaType = MediaType.AppleSonySS;
break;
case kSonyFormat800K:
ImageInfo.mediaType = MediaType.AppleSonyDS;
break;
case kSonyFormat720K:
ImageInfo.mediaType = MediaType.DOS_35_DS_DD_9;
break;
case kSonyFormat1440K:
ImageInfo.mediaType = MediaType.DOS_35_HD;
break;
case kSonyFormat1680K:
ImageInfo.mediaType = MediaType.DMF;
break;
case kSigmaFormatTwiggy:
ImageInfo.mediaType = MediaType.AppleFileWare;
break;
case kNotStandardFormat:
switch(ImageInfo.sectors)
{
case 9728:
ImageInfo.mediaType = MediaType.AppleProfile;
break;
case 19456:
ImageInfo.mediaType = MediaType.AppleProfile;
break;
case 38912:
ImageInfo.mediaType = MediaType.AppleWidget;
break;
case 39040:
ImageInfo.mediaType = MediaType.AppleHD20;
break;
default:
ImageInfo.mediaType = MediaType.Unknown;
break;
}
break;
default:
ImageInfo.mediaType = MediaType.Unknown;
break;
}
if(ImageInfo.mediaType == MediaType.AppleFileWare)
{
byte[] data = new byte[header.dataSize];
byte[] tags = new byte[header.tagSize];
twiggyCache = new byte[header.dataSize];
twiggyCacheTags = new byte[header.tagSize];
twiggy = true;
Stream datastream = imageFilter.GetDataForkStream();
datastream.Seek((dataOffset), SeekOrigin.Begin);
datastream.Read(data, 0, (int)header.dataSize);
Stream tagstream = imageFilter.GetDataForkStream();
tagstream.Seek((tagOffset), SeekOrigin.Begin);
tagstream.Read(tags, 0, (int)header.tagSize);
ushort MFS_Magic = BigEndianBitConverter.ToUInt16(data, (int)((data.Length / 2) + 0x400));
ushort MFS_AllBlocks = BigEndianBitConverter.ToUInt16(data, (int)((data.Length / 2) + 0x412));
// Detect a Macintosh Twiggy
if(MFS_Magic == 0xD2D7 && MFS_AllBlocks == 422)
{
DicConsole.DebugWriteLine("DC42 plugin", "Macintosh Twiggy detected, reversing disk sides");
Array.Copy(data, (header.dataSize / 2), twiggyCache, 0, header.dataSize / 2);
Array.Copy(tags, (header.tagSize / 2), twiggyCacheTags, 0, header.tagSize / 2);
Array.Copy(data, 0, twiggyCache, header.dataSize / 2, header.dataSize / 2);
Array.Copy(tags, 0, twiggyCacheTags, header.tagSize / 2, header.tagSize / 2);
}
else
{
DicConsole.DebugWriteLine("DC42 plugin", "Lisa Twiggy detected, reversing second half of disk");
Array.Copy(data, 0, twiggyCache, 0, header.dataSize / 2);
Array.Copy(tags, 0, twiggyCacheTags, 0, header.tagSize / 2);
int copiedSectors = 0;
int sectorsToCopy = 0;
for(int i = 0; i < 46; i++)
{
if(i >= 0 && i <= 3)
sectorsToCopy = 22;
if(i >= 4 && i <= 10)
sectorsToCopy = 21;
if(i >= 11 && i <= 16)
sectorsToCopy = 20;
if(i >= 17 && i <= 22)
sectorsToCopy = 19;
if(i >= 23 && i <= 28)
sectorsToCopy = 18;
if(i >= 29 && i <= 34)
sectorsToCopy = 17;
if(i >= 35 && i <= 41)
sectorsToCopy = 16;
if(i >= 42 && i <= 45)
sectorsToCopy = 15;
Array.Copy(data, header.dataSize / 2 + copiedSectors * 512, twiggyCache, twiggyCache.Length - copiedSectors * 512 - sectorsToCopy * 512, sectorsToCopy * 512);
Array.Copy(tags, header.tagSize / 2 + copiedSectors * bptag, twiggyCacheTags, twiggyCacheTags.Length - copiedSectors * bptag - sectorsToCopy * bptag, sectorsToCopy * bptag);
copiedSectors += sectorsToCopy;
}
}
}
try
{
if(imageFilter.HasResourceFork())
{
ResourceFork rsrcFork = new ResourceFork(imageFilter.GetResourceForkStream());
if(rsrcFork.ContainsKey(0x76657273))
{
Resource versRsrc = rsrcFork.GetResource(0x76657273);
if(versRsrc != null)
{
byte[] vers = versRsrc.GetResource(versRsrc.GetIds()[0]);
if(vers != null)
{
Resources.Version version = new Resources.Version(vers);
string major;
string minor;
string release = null;
string dev = null;
string pre = null;
major = string.Format("{0}", version.MajorVersion);
minor = string.Format(".{0}", version.MinorVersion / 10);
if(version.MinorVersion % 10 > 0)
release = string.Format(".{0}", version.MinorVersion % 10);
switch(version.DevStage)
{
case Resources.Version.DevelopmentStage.Alpha:
dev = "a";
break;
case Resources.Version.DevelopmentStage.Beta:
dev = "b";
break;
case Resources.Version.DevelopmentStage.PreAlpha:
dev = "d";
break;
}
if(dev == null && version.PreReleaseVersion > 0)
dev = "f";
if(dev != null)
pre = string.Format("{0}", version.PreReleaseVersion);
ImageInfo.imageApplicationVersion = string.Format("{0}{1}{2}{3}{4}", major, minor, release, dev, pre);
ImageInfo.imageApplication = version.VersionString;
ImageInfo.imageComments = version.VersionMessage;
}
}
}
if(rsrcFork.ContainsKey(0x64437079))
{
Resource dCpyRsrc = rsrcFork.GetResource(0x64437079);
if(dCpyRsrc != null)
{
// TODO: Use MacRoman
string dCpy = StringHandlers.PascalToString(dCpyRsrc.GetResource(dCpyRsrc.GetIds()[0]));
string dCpyRegEx = "(?<application>\\S+)\\s(?<version>\\S+)\\rData checksum=\\$(?<checksum>\\S+)$";
Regex dCpyEx = new Regex(dCpyRegEx);
Match dCpyMatch = dCpyEx.Match(dCpy);
if(dCpyMatch.Success)
{
ImageInfo.imageApplication = dCpyMatch.Groups["application"].Value;
ImageInfo.imageApplicationVersion = dCpyMatch.Groups["version"].Value;
// Until MacRoman is implemented
if(ImageInfo.imageApplication == "ShrinkWrap?")
ImageInfo.imageApplication = "ShrinkWrap™";
}
}
}
}
}
catch(InvalidCastException) { }
DicConsole.DebugWriteLine("DC42 plugin", "Image application = {0} version {1}", ImageInfo.imageApplication, ImageInfo.imageApplicationVersion);
ImageInfo.xmlMediaType = XmlMediaType.BlockMedia;
DicConsole.VerboseWriteLine("DiskCopy 4.2 image contains a disk of type {0}", ImageInfo.mediaType);
return true;
}
public override bool? VerifySector(ulong sectorAddress)
{
return null;
}
public override bool? VerifySector(ulong sectorAddress, uint track)
{
return null;
}
public override bool? VerifySectors(ulong sectorAddress, uint length, out List<ulong> FailingLBAs, out List<ulong> UnknownLBAs)
{
FailingLBAs = new List<ulong>();
UnknownLBAs = new List<ulong>();
for(ulong i = sectorAddress; i < sectorAddress + length; i++)
UnknownLBAs.Add(i);
return null;
}
public override bool? VerifySectors(ulong sectorAddress, uint length, uint track, out List<ulong> FailingLBAs, out List<ulong> UnknownLBAs)
{
FailingLBAs = new List<ulong>();
UnknownLBAs = new List<ulong>();
for(ulong i = sectorAddress; i < sectorAddress + length; i++)
UnknownLBAs.Add(i);
return null;
}
public override bool? VerifyMediaImage()
{
byte[] data = new byte[header.dataSize];
byte[] tags = new byte[header.tagSize];
uint dataChk;
uint tagsChk = 0;
DicConsole.DebugWriteLine("DC42 plugin", "Reading data");
Stream datastream = dc42ImageFilter.GetDataForkStream();
datastream.Seek((dataOffset), SeekOrigin.Begin);
datastream.Read(data, 0, (int)header.dataSize);
DicConsole.DebugWriteLine("DC42 plugin", "Calculating data checksum");
dataChk = DC42CheckSum(data);
DicConsole.DebugWriteLine("DC42 plugin", "Calculated data checksum = 0x{0:X8}", dataChk);
DicConsole.DebugWriteLine("DC42 plugin", "Stored data checksum = 0x{0:X8}", header.dataChecksum);
if(header.tagSize > 0)
{
DicConsole.DebugWriteLine("DC42 plugin", "Reading tags");
Stream tagstream = dc42ImageFilter.GetDataForkStream();
tagstream.Seek((tagOffset), SeekOrigin.Begin);
tagstream.Read(tags, 0, (int)header.tagSize);
DicConsole.DebugWriteLine("DC42 plugin", "Calculating tag checksum");
tagsChk = DC42CheckSum(tags);
DicConsole.DebugWriteLine("DC42 plugin", "Calculated tag checksum = 0x{0:X8}", tagsChk);
DicConsole.DebugWriteLine("DC42 plugin", "Stored tag checksum = 0x{0:X8}", header.tagChecksum);
}
return dataChk == header.dataChecksum && tagsChk == header.tagChecksum;
}
public override bool ImageHasPartitions()
{
return ImageInfo.imageHasPartitions;
}
public override ulong GetImageSize()
{
return ImageInfo.imageSize;
}
public override ulong GetSectors()
{
return ImageInfo.sectors;
}
public override uint GetSectorSize()
{
return ImageInfo.sectorSize;
}
public override byte[] ReadSector(ulong sectorAddress)
{
return ReadSectors(sectorAddress, 1);
}
public override byte[] ReadSectorTag(ulong sectorAddress, SectorTagType tag)
{
return ReadSectorsTag(sectorAddress, 1, tag);
}
public override byte[] ReadSectors(ulong sectorAddress, uint length)
{
if(sectorAddress > ImageInfo.sectors - 1)
throw new ArgumentOutOfRangeException(nameof(sectorAddress), "Sector address not found");
if(sectorAddress + length > ImageInfo.sectors)
throw new ArgumentOutOfRangeException(nameof(length), "Requested more sectors than available");
byte[] buffer = new byte[length * ImageInfo.sectorSize];
if(twiggy)
{
Array.Copy(twiggyCache, (int)sectorAddress * ImageInfo.sectorSize, buffer, 0, length * ImageInfo.sectorSize);
}
else
{
Stream stream = dc42ImageFilter.GetDataForkStream();
stream.Seek((long)(dataOffset + sectorAddress * ImageInfo.sectorSize), SeekOrigin.Begin);
stream.Read(buffer, 0, (int)(length * ImageInfo.sectorSize));
}
return buffer;
}
public override byte[] ReadSectorsTag(ulong sectorAddress, uint length, SectorTagType tag)
{
if(tag != SectorTagType.AppleSectorTag)
throw new FeatureUnsupportedImageException(string.Format("Tag {0} not supported by image format", tag));
if(header.tagSize == 0)
throw new FeatureNotPresentImageException("Disk image does not have tags");
if(sectorAddress > ImageInfo.sectors - 1)
throw new ArgumentOutOfRangeException(nameof(sectorAddress), "Sector address not found");
if(sectorAddress + length > ImageInfo.sectors)
throw new ArgumentOutOfRangeException(nameof(length), "Requested more sectors than available");
byte[] buffer = new byte[length * bptag];
if(twiggy)
{
Array.Copy(twiggyCacheTags, (int)sectorAddress * bptag, buffer, 0, length * bptag);
}
else
{
Stream stream = dc42ImageFilter.GetDataForkStream();
stream.Seek((long)(tagOffset + sectorAddress * bptag), SeekOrigin.Begin);
stream.Read(buffer, 0, (int)(length * bptag));
}
return buffer;
}
public override byte[] ReadSectorLong(ulong sectorAddress)
{
return ReadSectorsLong(sectorAddress, 1);
}
public override byte[] ReadSectorsLong(ulong sectorAddress, uint length)
{
if(sectorAddress > ImageInfo.sectors - 1)
throw new ArgumentOutOfRangeException(nameof(sectorAddress), "Sector address not found");
if(sectorAddress + length > ImageInfo.sectors)
throw new ArgumentOutOfRangeException(nameof(length), "Requested more sectors than available");
byte[] data = ReadSectors(sectorAddress, length);
byte[] tags = ReadSectorsTag(sectorAddress, length, SectorTagType.AppleSectorTag);
byte[] buffer = new byte[data.Length + tags.Length];
for(uint i = 0; i < length; i++)
{
Array.Copy(data, i * (ImageInfo.sectorSize), buffer, i * (ImageInfo.sectorSize + bptag), ImageInfo.sectorSize);
Array.Copy(tags, i * (bptag), buffer, i * (ImageInfo.sectorSize + bptag) + ImageInfo.sectorSize, bptag);
}
return buffer;
}
public override string GetImageFormat()
{
return "Apple DiskCopy 4.2";
}
public override string GetImageVersion()
{
return ImageInfo.imageVersion;
}
public override string GetImageApplication()
{
return ImageInfo.imageApplication;
}
public override string GetImageApplicationVersion()
{
return ImageInfo.imageApplicationVersion;
}
public override DateTime GetImageCreationTime()
{
return ImageInfo.imageCreationTime;
}
public override DateTime GetImageLastModificationTime()
{
return ImageInfo.imageLastModificationTime;
}
public override string GetImageName()
{
return ImageInfo.imageName;
}
public override MediaType GetMediaType()
{
return ImageInfo.mediaType;
}
#region Unsupported features
public override byte[] ReadDiskTag(MediaTagType tag)
{
throw new FeatureUnsupportedImageException("Feature not supported by image format");
}
public override string GetImageCreator()
{
return ImageInfo.imageCreator;
}
public override string GetImageComments()
{
return ImageInfo.imageComments;
}
public override string GetMediaManufacturer()
{
return ImageInfo.mediaManufacturer;
}
public override string GetMediaModel()
{
return ImageInfo.mediaModel;
}
public override string GetMediaSerialNumber()
{
return ImageInfo.mediaSerialNumber;
}
public override string GetMediaBarcode()
{
return ImageInfo.mediaBarcode;
}
public override string GetMediaPartNumber()
{
return ImageInfo.mediaPartNumber;
}
public override int GetMediaSequence()
{
return ImageInfo.mediaSequence;
}
public override int GetLastDiskSequence()
{
return ImageInfo.lastMediaSequence;
}
public override string GetDriveManufacturer()
{
return ImageInfo.driveManufacturer;
}
public override string GetDriveModel()
{
return ImageInfo.driveModel;
}
public override string GetDriveSerialNumber()
{
return ImageInfo.driveSerialNumber;
}
public override List<Partition> GetPartitions()
{
throw new FeatureUnsupportedImageException("Feature not supported by image format");
}
public override List<Track> GetTracks()
{
throw new FeatureUnsupportedImageException("Feature not supported by image format");
}
public override List<Track> GetSessionTracks(Session session)
{
throw new FeatureUnsupportedImageException("Feature not supported by image format");
}
public override List<Track> GetSessionTracks(ushort session)
{
throw new FeatureUnsupportedImageException("Feature not supported by image format");
}
public override List<Session> GetSessions()
{
throw new FeatureUnsupportedImageException("Feature not supported by image format");
}
public override byte[] ReadSector(ulong sectorAddress, uint track)
{
throw new FeatureUnsupportedImageException("Feature not supported by image format");
}
public override byte[] ReadSectorTag(ulong sectorAddress, uint track, SectorTagType tag)
{
throw new FeatureUnsupportedImageException("Feature not supported by image format");
}
public override byte[] ReadSectors(ulong sectorAddress, uint length, uint track)
{
throw new FeatureUnsupportedImageException("Feature not supported by image format");
}
public override byte[] ReadSectorsTag(ulong sectorAddress, uint length, uint track, SectorTagType tag)
{
throw new FeatureUnsupportedImageException("Feature not supported by image format");
}
public override byte[] ReadSectorLong(ulong sectorAddress, uint track)
{
throw new FeatureUnsupportedImageException("Feature not supported by image format");
}
public override byte[] ReadSectorsLong(ulong sectorAddress, uint length, uint track)
{
throw new FeatureUnsupportedImageException("Feature not supported by image format");
}
#endregion Unsupported features
#region Private methods
private static uint DC42CheckSum(byte[] buffer)
{
uint dc42chk = 0;
if((buffer.Length & 0x01) == 0x01)
return 0xFFFFFFFF;
for(uint i = 0; i < buffer.Length; i += 2)
{
dc42chk += (uint)(buffer[i] << 8);
dc42chk += buffer[i + 1];
dc42chk = (dc42chk >> 1) | (dc42chk << 31);
}
return dc42chk;
}
#endregion
}
}
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