/// <summary>
/// Creates a new instance if the UnmergedProgram structure.
/// </summary>
/// <param name="code">INTV Funhouse code for the ROM.</param>
/// <param name="title">The title of the program (typically title screen title).</param>
/// <param name="vendor">Vendor who wrote the program.</param>
/// <param name="year">The year the program was copyrighted (or released).</param>
/// <param name="crcData">The CRC values of known versions of the program.</param>
/// <param name="crcDescriptions">The descriptions of the known versions of the program for each CRC.</param>
/// <param name="generalFeatures">Generic program features.</param>
/// <param name="cuttleCart3">Cuttle Cart 3 features.</param>
internal UnmergedProgram(string code, string title, string vendor, string year, uint[] crcData, string[] crcDescriptions, GeneralFeatures generalFeatures, CuttleCart3Features cuttleCart3)
{
Code = code;
CrcData = crcData;
CrcDescriptions = crcDescriptions;
CrcCfgs = Enumerable.Repeat(-1, crcData.Count()).ToArray();
Year = year;
Title = title;
Vendor = vendor;
Features = new ProgramFeatures();
Features.GeneralFeatures = generalFeatures;
Features.CuttleCart3 = cuttleCart3;
}
/// <summary>
/// Creates a new instance if the UnmergedProgram structure.
/// </summary>
/// <param name="code">INTV Funhouse code for the ROM.</param>
/// <param name="title">The title of the program (typically title screen title).</param>
/// <param name="vendor">Vendor who wrote the program.</param>
/// <param name="year">The year the program was copyrighted (or released).</param>
/// <param name="crcData">The CRC values of known versions of the program.</param>
/// <param name="crcDescriptions">The descriptions of the known versions of the program for each CRC.</param>
/// <param name="generalFeatures">Generic program features.</param>
/// <param name="intellivoice">Intellivoice compatibility.</param>
internal UnmergedProgram(string code, string title, string vendor, string year, uint[] crcData, string[] crcDescriptions, GeneralFeatures generalFeatures, FeatureCompatibility intellivoice)
{
Code = code;
CrcData = crcData;
CrcDescriptions = crcDescriptions;
CrcCfgs = Enumerable.Repeat((generalFeatures == GeneralFeatures.SystemRom) ? -1 : 0, crcData.Count()).ToArray();
Year = year;
Title = title;
Vendor = vendor;
Features = new ProgramFeatures();
Features.GeneralFeatures = generalFeatures;
Features.Intellivoice = intellivoice;
}
/// <summary>
/// Creates a new instance if the UnmergedProgram structure.
/// </summary>
/// <param name="code">INTV Funhouse code for the ROM.</param>
/// <param name="title">The title of the program (typically title screen title).</param>
/// <param name="vendor">Vendor who wrote the program.</param>
/// <param name="year">The year the program was copyrighted (or released).</param>
/// <param name="crcData">The CRC values of known versions of the program.</param>
/// <param name="crcDescriptions">The descriptions of the known versions of the program for each CRC.</param>
/// <param name="generalFeatures">Generic program features.</param>
/// <param name="keyboardComponent">Keyboard component features.</param>
internal UnmergedProgram(string code, string title, string vendor, string year, uint[] crcData, string[] crcDescriptions, GeneralFeatures generalFeatures, KeyboardComponentFeatures keyboardComponent)
{
Code = code;
CrcData = crcData;
CrcDescriptions = crcDescriptions;
CrcCfgs = Enumerable.Repeat(-1, crcData.Count()).ToArray();
Year = year;
Title = title;
Vendor = vendor;
Features = new ProgramFeatures();
Features.GeneralFeatures = generalFeatures;
Features.KeyboardComponent = keyboardComponent;
}
/// <summary>
/// Initializes a new instance of the <see cref="INTV.Core.Model.Program.LuigiFileMetadataProgramInformation"/> class.
/// </summary>
/// <param name="header">A LUIGI file header that describes the ROM's features.</param>
/// <param name="metadata">Additional ROM metadata, if any.</param>
public LuigiFileMetadataProgramInformation(LuigiFileHeader header, LuigiMetadataBlock metadata)
{
_features = ProgramFeatures.Combine(header.Features.ToProgramFeatures(), header.Features2.ToProgramFeatures());
_crc = new CrcData(header.OriginalRomCrc32, string.Empty, _features.ToIncompatibilityFlags());
Metadata = metadata;
if (metadata != null)
{
_title = metadata.LongNames.FirstOrDefault();
_vendor = metadata.Publishers.FirstOrDefault();
if (metadata.ReleaseDates.Any())
{
_year = metadata.ReleaseDates.First().Date.Year.ToString();
}
_shortName = metadata.ShortNames.FirstOrDefault();
}
}
/// <summary>
/// Creates a new instance of the UnmergedProgramInformation class.
/// </summary>
/// <param name="code">INTV Funhouse database code of the program.</param>
/// <param name="title">Title of the program.</param>
/// <param name="vendor">Program vendor.</param>
/// <param name="year">The year the program was copyrighted (or released).</param>
/// <param name="crcData">Known CRC values for the program ROM variants.</param>
/// <param name="crcDescriptions">Descriptions of the ROM variations.</param>
/// <param name="crcCfgs">The default .cfg file to use if one is not provided.</param>
/// <param name="features">The program's features.</param>
internal UnmergedProgramInformation(string code, string title, string vendor, string year, uint[] crcData, string[] crcDescriptions, int[] crcCfgs, ProgramFeatures features)
{
Code = code;
_title = title;
_vendor = vendor;
_year = year;
_crc = new List <CrcData>();
for (int i = 0; i < crcData.Length; ++i)
{
var crcDescription = string.Empty;
if (i < crcDescriptions.Length)
{
crcDescription = crcDescriptions[i];
}
_crc.Add(new CrcData(crcData[i], crcDescription, IncompatibilityFlags.None, crcCfgs[i]));
}
_features = features;
}
/// <summary>
/// Initializes a new instance of the <see cref="INTV.Core.Model.Program.RomFileMetadataProgramInformation"/> class.
/// </summary>
/// <param name="rom">The ROM whose metadata program information is desired. If not a RomFormatRom, the
/// metadata will be empty, and the features will be generic unrecognized ROM features.</param>
public RomFileMetadataProgramInformation(IRom rom)
{
_features = ProgramFeatures.GetUnrecognizedRomFeatures();
Metadata = Enumerable.Empty <RomMetadataBlock>();
var romFormatRom = Rom.AsSpecificRomType <RomFormatRom>(rom);
if (romFormatRom != null)
{
Metadata = romFormatRom.Metadata;
var stringMetaData = Metadata.FirstOrDefault(m => m.Type == RomMetadataIdTag.Title) as RomMetadataString;
if ((stringMetaData != null) && !string.IsNullOrEmpty(stringMetaData.StringValue))
{
_title = stringMetaData.StringValue;
}
stringMetaData = Metadata.FirstOrDefault(m => m.Type == RomMetadataIdTag.ShortTitle) as RomMetadataString;
if ((stringMetaData != null) && !string.IsNullOrEmpty(stringMetaData.StringValue))
{
_shortName = stringMetaData.StringValue;
}
var date = Metadata.OfType <RomMetadataDate>().FirstOrDefault(d => d.Type == RomMetadataIdTag.ReleaseDate);
if ((date != null) && date.Date.Flags.HasFlag(MetadataDateTimeFlags.Year))
{
_year = date.Date.Date.Year.ToString();
}
var vendor = Metadata.OfType <RomMetadataPublisher>().FirstOrDefault();
if (vendor != null)
{
_vendor = vendor.Publisher;
}
var features = Metadata.OfType <RomMetadataFeatures>().FirstOrDefault();
if (features != null)
{
_features = features.Features;
}
_crc = new CrcData(romFormatRom.Crc, string.Empty, _features.ToIncompatibilityFlags());
}
}
public CfgFileMetadataProgramInformation(IRom rom)
{
_features = ProgramFeatures.GetUnrecognizedRomFeatures();
Metadata = Enumerable.Empty <CfgVarMetadataBlock>();
var binFormatRom = Rom.AsSpecificRomType <BinFormatRom>(rom);
if (binFormatRom != null)
{
Metadata = binFormatRom.Metadata;
var stringMetaData = Metadata.FirstOrDefault(m => m.Type == CfgVarMetadataIdTag.Name) as CfgVarMetadataString;
if ((stringMetaData != null) && !string.IsNullOrEmpty(stringMetaData.StringValue))
{
_title = stringMetaData.StringValue;
}
stringMetaData = Metadata.FirstOrDefault(m => m.Type == CfgVarMetadataIdTag.ShortName) as CfgVarMetadataString;
if ((stringMetaData != null) && !string.IsNullOrEmpty(stringMetaData.StringValue))
{
_shortName = stringMetaData.StringValue;
}
var date = Metadata.OfType <CfgVarMetadataDate>().FirstOrDefault(d => d.Type == CfgVarMetadataIdTag.ReleaseDate);
if ((date != null) && date.Date.Flags.HasFlag(MetadataDateTimeFlags.Year))
{
_year = date.Date.Date.Year.ToString();
}
var vendor = Metadata.FirstOrDefault(m => m.Type == CfgVarMetadataIdTag.Publisher) as CfgVarMetadataString;
if (vendor != null)
{
_vendor = vendor.StringValue;
}
// NOTE: If these are specified multiple times, the 'last one wins' rule will be in effect.
// That's technically OK, since the behavior is unspecified. From as1600.txt:
//
// Lines marked with a "*" can be repeated. For example, if a game has multiple
// authors, you can list them all with their own author variable. Likewise, if
// a program was released multiple times, you can give a list of release dates.
//
// For other values, repeating a variable does not have a well defined meaning.
// Typically (but not always), the first instance takes precedence.
//
// So in the case of specifying features multiple times, this code will result in
// 'last one wins'.
foreach (var feature in Metadata.OfType <CfgVarMetadataFeatureCompatibility>())
{
switch (feature.Type)
{
case CfgVarMetadataIdTag.Ecs:
case CfgVarMetadataIdTag.EcsCompatibility:
_features.Ecs = (EcsFeatures)feature.Compatibility;
break;
case CfgVarMetadataIdTag.Voice:
case CfgVarMetadataIdTag.IntellivoiceCompatibility:
_features.Intellivoice = feature.Compatibility;
break;
case CfgVarMetadataIdTag.IntellivisionII:
case CfgVarMetadataIdTag.IntellivisionIICompatibility:
_features.IntellivisionII = feature.Compatibility;
break;
case CfgVarMetadataIdTag.KeyboardComponentCompatibility:
_features.KeyboardComponent = (KeyboardComponentFeatures)feature.Compatibility;
break;
case CfgVarMetadataIdTag.TutorvisionCompatibility:
_features.Tutorvision = feature.Compatibility;
break;
case CfgVarMetadataIdTag.JlpAccelerators:
case CfgVarMetadataIdTag.Jlp:
_features.Jlp = (JlpFeatures)feature.Compatibility;
if (_features.Jlp != JlpFeatures.Incompatible)
{
_features.JlpHardwareVersion = JlpHardwareVersion.Jlp03; // Assume minimal hardware version needed
if (_features.Jlp > JlpFeatures.Tolerates)
{
// Flash storage is indicated, so check for it.
var flashStorage = Metadata.FirstOrDefault(m => m.Type == CfgVarMetadataIdTag.JlpFlash) as CfgVarMetadataInteger;
if ((flashStorage != null) && (flashStorage.IntegerValue > 0))
{
// TODO: Min value checking here?
_features.JlpFlashMinimumSaveSectors = (ushort)flashStorage.IntegerValue;
_features.Jlp |= JlpFeatures.SaveDataRequired;
}
}
}
break;
default:
break;
}
}
var ltoMapper = Metadata.FirstOrDefault(m => m.Type == CfgVarMetadataIdTag.LtoFlashMapper) as CfgVarMetadataBoolean;
if (ltoMapper != null)
{
_features.LtoFlash = LtoFlashFeatures.Requires | LtoFlashFeatures.LtoFlashMemoryMapped;
}
_crc = new CrcData(binFormatRom.Crc, string.Empty, _features.ToIncompatibilityFlags());
}
}
/// <summary>
/// Merges the given IProgramInformation data to form a new, combined version of the information.
/// </summary>
/// <param name="programInformation">The "primary" source of information.</param>
/// <param name="fieldsToMerge">Identifies which fields to merge.</param>
/// <param name="otherSources">The other information sources to merge, and how to merge them. See Remarks.</param>
/// <returns>The merged program information.</returns>
/// <remarks>Each of the additional information sources in the merge will be combined with the primary. The newly
/// merged information is initialized using the data from <paramref name="programInformation"/>. The
/// other sources should be ordered such that the first entry is the "most important" and the final entry the
/// "least important". Each entry also describes which fields it is allowed to override in the merge.
/// This is to offer a means of conflict resolution in situations arising from multiple sources containing
/// the same information and attempting to override the default. For example, consider the case in which
/// <paramref name="programInformation"/> and two entries are provided via <paramref name="otherSources"/>,
/// all three of which define a value for <see cref="IProgramInformation.Title"/>. Here are some ways in which
/// this can be configured:
/// <code>
/// fieldsToMerge = ProgramInformationMergeFieldsFlags.None;
/// </code>
/// In this case, the information in <paramref name="programInformation"/> will not be changed. A copy of the
/// data within it will be returned. Note, however, that the specific implementation of <see cref="IProgramInformation"/>
/// used to deliver the resulting data may be different than the original!
/// Now, consider this scenario:
/// <code>
/// fieldsToMerge = ProgramInformationMergeFieldsFlags.Title;
/// otherSources[0].Item2 = ProgramInformationMergeFieldsFlags.Title;
/// otherSources[1].Item2 = ProgramInformationMergeFieldsFlags.Title;
/// </code>
/// In this case, each entry allows 'Title' to be set. Because <paramref name="programInformation"/> is
/// treated as the highest priority, its value will be retained unless it is not set (in this case, a <c>null</c>
/// or empty string). So, if programInformation.Title has no value, but otherSources[0].Item1.Title does, then
/// the final result contains otherSources[0].Item1.Title, regardless of the value of otherSources[1].Item1.Title.
/// By carefully considering these flags, you can have a reasonably rich order-of-precedence defined for establishing
/// the data in the merged result.
/// </remarks>
/// <exception cref="System.ArgumentException">Thrown if unrecognized flags are provided in <paramref name="fieldsToMerge"/> or via <paramref name="otherSources"/>.</exception>
public static IProgramInformation Merge(this IProgramInformation programInformation, ProgramInformationMergeFieldsFlags fieldsToMerge, params Tuple <IProgramInformation, ProgramInformationMergeFieldsFlags>[] otherSources)
{
// Grr.... PCLs (at least in .NET 4.0) don't support Enum.GetValues()
var flagsToProcess = new[] { ProgramInformationMergeFieldsFlags.Title, ProgramInformationMergeFieldsFlags.Vendor, ProgramInformationMergeFieldsFlags.Year, ProgramInformationMergeFieldsFlags.Features, ProgramInformationMergeFieldsFlags.ShortName, ProgramInformationMergeFieldsFlags.Crcs };
var unknownFlagsForMerge = otherSources.Select(s => s.Item2).Concat(new[] { fieldsToMerge }).Except(flagsToProcess).Except(new[] { ProgramInformationMergeFieldsFlags.None, ProgramInformationMergeFieldsFlags.All });
if (unknownFlagsForMerge.Any())
{
var unknownFlags = unknownFlagsForMerge.Aggregate((all, flag) => all | flag);
throw new ArgumentException(string.Format(Resources.Strings.ProgramInformation_InvalidFieldFormat, unknownFlags));
}
var mergedProgramInformation = new UserSpecifiedProgramInformation(programInformation);
var mergedPriorityFlags = fieldsToMerge; // accumulates if a "higher priority" info has already claimed a field
foreach (var otherSource in otherSources)
{
var otherInformation = otherSource.Item1;
var updateFlags = otherSource.Item2;
foreach (var flag in flagsToProcess)
{
if (updateFlags.HasFlag(flag))
{
switch (flag)
{
case ProgramInformationMergeFieldsFlags.Title:
if (string.IsNullOrEmpty(mergedProgramInformation.Title) || !mergedPriorityFlags.HasFlag(flag))
{
mergedProgramInformation.Title = otherInformation.Title;
if (!string.IsNullOrEmpty(mergedProgramInformation.Title))
{
mergedPriorityFlags |= flag;
}
}
break;
case ProgramInformationMergeFieldsFlags.Vendor:
if (string.IsNullOrEmpty(mergedProgramInformation.Vendor) || !mergedPriorityFlags.HasFlag(flag))
{
mergedProgramInformation.Vendor = otherInformation.Vendor;
if (!string.IsNullOrEmpty(mergedProgramInformation.Vendor))
{
mergedPriorityFlags |= flag;
}
}
break;
case ProgramInformationMergeFieldsFlags.Year:
if (string.IsNullOrEmpty(mergedProgramInformation.Year) || !mergedPriorityFlags.HasFlag(flag))
{
mergedProgramInformation.Year = otherInformation.Year;
if (!string.IsNullOrEmpty(mergedProgramInformation.Year))
{
mergedPriorityFlags |= flag;
}
}
break;
case ProgramInformationMergeFieldsFlags.Features:
// This runs the risk of combining conflicting flags...
mergedProgramInformation.Features = ProgramFeatures.Combine(mergedProgramInformation.Features, otherInformation.Features);
mergedPriorityFlags |= flag;
break;
case ProgramInformationMergeFieldsFlags.ShortName:
if (string.IsNullOrEmpty(mergedProgramInformation.ShortName) || !mergedPriorityFlags.HasFlag(flag))
{
mergedProgramInformation.ShortName = otherInformation.ShortName;
if (!string.IsNullOrEmpty(mergedProgramInformation.ShortName))
{
mergedPriorityFlags |= flag;
}
}
break;
case ProgramInformationMergeFieldsFlags.Crcs:
var crcsToMerge = otherInformation.Crcs.Where(o => !mergedProgramInformation.Crcs.Any(m => m.Crc == o.Crc));
foreach (var crc in crcsToMerge)
{
mergedProgramInformation.AddCrc(crc.Crc, crc.Description, crc.Incompatibilities);
mergedPriorityFlags |= flag;
}
break;
}
}
}
}
return(mergedProgramInformation);
}
/// <summary>
/// Updates a set of ProgramFeatures to include an incompatibilities set in the given flags.
/// </summary>
/// <param name="incompatibilityFlags">Condensed incompatibility information.</param>
/// <param name="programFeatures">The program features to update.</param>
/// <returns>The updated program features.</returns>
public static ProgramFeatures ApplyFlagsToProgramFeatures(this IncompatibilityFlags incompatibilityFlags, ProgramFeatures programFeatures)
{
if ((incompatibilityFlags & IncompatibilityFlags.Ntsc) == IncompatibilityFlags.Ntsc)
{
programFeatures.Ntsc = FeatureCompatibility.Incompatible;
}
if ((incompatibilityFlags & IncompatibilityFlags.Pal) == IncompatibilityFlags.Pal)
{
programFeatures.Pal = FeatureCompatibility.Incompatible;
}
if ((incompatibilityFlags & IncompatibilityFlags.KeyboardComponent) == IncompatibilityFlags.KeyboardComponent)
{
programFeatures.KeyboardComponent = KeyboardComponentFeatures.Incompatible;
}
if ((incompatibilityFlags & IncompatibilityFlags.SuperVideoArcade) == IncompatibilityFlags.SuperVideoArcade)
{
programFeatures.SuperVideoArcade = FeatureCompatibility.Incompatible;
}
if ((incompatibilityFlags & IncompatibilityFlags.SuperVideoArcadeAltered) == IncompatibilityFlags.SuperVideoArcadeAltered)
{
programFeatures.SuperVideoArcade = FeatureCompatibility.Enhances;
}
if ((incompatibilityFlags & IncompatibilityFlags.Intellivoice) == IncompatibilityFlags.Intellivoice)
{
programFeatures.Intellivoice = FeatureCompatibility.Incompatible;
}
if ((incompatibilityFlags & IncompatibilityFlags.IntellivisionII) == IncompatibilityFlags.IntellivisionII)
{
programFeatures.IntellivisionII = FeatureCompatibility.Incompatible;
}
if ((incompatibilityFlags & IncompatibilityFlags.IntellivisionIIAltered) == IncompatibilityFlags.IntellivisionIIAltered)
{
programFeatures.IntellivisionII = FeatureCompatibility.Enhances;
}
if ((incompatibilityFlags & IncompatibilityFlags.Ecs) == IncompatibilityFlags.Ecs)
{
programFeatures.Ecs = EcsFeatures.Incompatible;
}
if ((incompatibilityFlags & IncompatibilityFlags.Tutorvision) == IncompatibilityFlags.Tutorvision)
{
programFeatures.Tutorvision = FeatureCompatibility.Incompatible;
}
if ((incompatibilityFlags & IncompatibilityFlags.Intellicart) == IncompatibilityFlags.Intellicart)
{
programFeatures.Intellicart = IntellicartCC3Features.Incompatible;
}
if ((incompatibilityFlags & IncompatibilityFlags.CuttleCart3) == IncompatibilityFlags.CuttleCart3)
{
programFeatures.CuttleCart3 = CuttleCart3Features.Incompatible;
}
if ((incompatibilityFlags & IncompatibilityFlags.Jlp) == IncompatibilityFlags.Jlp)
{
programFeatures.Jlp = JlpFeatures.Incompatible;
}
if ((incompatibilityFlags & IncompatibilityFlags.LtoFlash) == IncompatibilityFlags.LtoFlash)
{
programFeatures.LtoFlash = LtoFlashFeatures.Incompatible;
}
if ((incompatibilityFlags & IncompatibilityFlags.Bee3) == IncompatibilityFlags.Bee3)
{
programFeatures.Bee3 = Bee3Features.Incompatible;
}
if ((incompatibilityFlags & IncompatibilityFlags.Hive) == IncompatibilityFlags.Hive)
{
programFeatures.Hive = HiveFeatures.Incompatible;
}
return(programFeatures);
}
/// <summary>
/// Expands a set of condensed incompatibility flags to a full-fledged ProgramFeatures set.
/// </summary>
/// <param name="incompatibilityFlags">The flags to convert.</param>
/// <returns>A ProgramFeatures object that includes all incompatibilities.</returns>
/// <remarks>The default features are contained in the returned features for any incompatibility flag that is not set.</remarks>
public static IProgramFeatures ToProgramFeatures(this IncompatibilityFlags incompatibilityFlags)
{
var programFeatures = new ProgramFeatures();
return(incompatibilityFlags.ApplyFlagsToProgramFeatures(programFeatures));
}
/// <summary>
/// Creates a new instance of the UserSpecifiedProgramInformation class.
/// </summary>
/// <param name="crc">The CRC of the program's ROM file.</param>
/// <param name="title">The title of the program.</param>
/// <param name="year">Copyright date of the program.</param>
/// <param name="features">The features of the program.</param>
/// <param name="crcDescription">Description of the variant of the program identified by its CRC.</param>
/// <exception cref="ArgumentException">Thrown if crc is zero.</exception>
/// <exception cref="ArgumentNullException">Thrown if any metadata values are <c>null</c>.</exception>
public UserSpecifiedProgramInformation(uint crc, string title, string year, ProgramFeatures features, string crcDescription)
: this(crc, title, year, features, crcDescription, IncompatibilityFlags.None)
{
}
/// <summary>
/// Creates a new instance of the UserSpecifiedProgramInformation class.
/// </summary>
/// <param name="crc">The CRC of the program's ROM file.</param>
/// <param name="title">The title of the program.</param>
/// <param name="year">Copyright date of the program.</param>
/// <param name="features">The features of the program.</param>
/// <exception cref="ArgumentException">Thrown if crc is zero.</exception>
public UserSpecifiedProgramInformation(uint crc, string title, string year, ProgramFeatures features)
: this(crc, title, year, features, string.Empty)
{
}
/// <summary>
/// Creates a new instance of the UserSpecifiedProgramInformation class.
/// </summary>
/// <param name="crc">The CRC of the program's ROM file.</param>
/// <param name="title">The title of the program.</param>
/// <param name="year">Copyright date of the program.</param>
/// <exception cref="ArgumentException">Thrown if crc is zero.</exception>
public UserSpecifiedProgramInformation(uint crc, string title, string year)
: this(crc, title, year, ProgramFeatures.GetUnrecognizedRomFeatures())
{
}
/// <inheritdoc />
public bool Equals(ProgramFeatures other)
{
return(CompareTo(other) == 0);
}
/// <summary>
/// Combines two sets of ProgramFeatures into a new set of ProgramFeatures.
/// </summary>
/// <param name="features1">The first set of features.</param>
/// <param name="features2">The second set of features.</param>
/// <returns>The combined set of features.</returns>
/// <remarks>NOTE: Only basic consistency checks are done. The default behavior is to OR the feature bits of each category
/// together, with additional comparison against the default set of bits for the feature set. If the bits are different from
/// each other, and one set matches the default bits while the other does not, then the non-default bits "win".
/// If both feature sets define a JLP Hardware version, the larger of the two versions is used.</remarks>
public static ProgramFeatures Combine(ProgramFeatures features1, ProgramFeatures features2)
{
ProgramFeatures combinedFeatures = null;
if ((features1 == null) && (features2 == null))
{
combinedFeatures = GetUnrecognizedRomFeatures();
}
else if (features1 == null)
{
combinedFeatures = features2.Clone();
}
else if (features2 == null)
{
combinedFeatures = features1.Clone();
}
else
{
combinedFeatures = EmptyFeatures.Clone();
foreach (var feature in features1._features.Keys)
{
var defaultFeatureBits = DefaultFeatures._features[feature];
var features1Bits = features1._features[feature];
var features2Bits = features2._features[feature];
var features1BitsMatchDefault = features1Bits == defaultFeatureBits;
var features2BitsMatchDefault = features2Bits == defaultFeatureBits;
var featureBits = features1Bits;
if (features1BitsMatchDefault && !features2BitsMatchDefault)
{
featureBits = features2Bits;
}
else if (features2BitsMatchDefault && !features1BitsMatchDefault)
{
featureBits = features1Bits;
}
else if (!features1BitsMatchDefault && !features2BitsMatchDefault)
{
featureBits = features1Bits | features2Bits;
}
switch (feature)
{
case FeatureCategory.Ntsc:
case FeatureCategory.Pal:
// If we've combined "Tolerates" and "Enhances" we'll get "required", which, for video standards, is not suitable.
featureBits = (uint)((FeatureCompatibility)featureBits).CoerceVideoStandardCompatibility();
break;
case FeatureCategory.General:
case FeatureCategory.SuperVideoArcade:
// Leave these alone...
break;
default:
// For these, we don't want to have a 'tolerates' combine with 'enhances' to turn into 'requires', so, if
// one set contains only 'tolerates' and the other contains only 'enhances' then just keep 'enhances'.
var feature1Compat = features1Bits & FeatureCompatibilityHelpers.CompatibilityMask;
var feature2Compat = features2Bits & FeatureCompatibilityHelpers.CompatibilityMask;
if ((feature1Compat != 0) && (feature2Compat != 0) && ((feature1Compat ^ feature2Compat) == (uint)FeatureCompatibility.Requires))
{
// Retain 'enhances' only.
featureBits &= (uint)~FeatureCompatibility.Tolerates;
}
break;
}
combinedFeatures.CheckAccessSetFeatureBits(feature, featureBits);
}
combinedFeatures.JlpHardwareVersion = (JlpHardwareVersion)Math.Max((int)features1.JlpHardwareVersion, (int)features2.JlpHardwareVersion);
}
return(combinedFeatures);
}