/// <summary>
/// Loads a structure layout based upon an XML container's children.
/// </summary>
/// <param name="layoutTag">The collection of structure field tags to parse.</param>
/// <returns>The structure layout that was loaded.</returns>
public static StructureLayout LoadLayout(XContainer layoutTag)
{
StructureLayout layout = new StructureLayout();
foreach (XElement element in layoutTag.Elements())
HandleElement(layout, element);
return layout;
}
private IReader _reader; // The stream to read from
#endregion Fields
#region Constructors
/// <summary>
/// (private) Constructs a new StructureReader.
/// </summary>
/// <param name="reader">The IReader to read from.</param>
/// <param name="layout">The structure layout to follow.</param>
private StructureReader(IReader reader, StructureLayout layout)
{
_reader = reader;
_layout = layout;
_baseOffset = reader.Position;
_offset = _baseOffset;
_collection = new StructureValueCollection();
}
public ThirdGenLanguage(ThirdGenLanguageGlobals languageGlobals, StructureValueCollection values, IndexOffsetConverter converter, BuildInformation buildInfo)
{
_languageGlobals = languageGlobals;
_pointerLayout = buildInfo.GetLayout("locale index table entry");
_encryptionKey = buildInfo.LocaleKey;
_symbols = buildInfo.LocaleSymbols;
_converter = converter;
_pageSize = buildInfo.LocaleAlignment;
Load(values, converter);
}
/// <summary>
/// Adds a layout to the collection, associating it with a certain name.
/// </summary>
/// <param name="name">The name to associate the layout with.</param>
/// <param name="layout">The StructureLayout to add.</param>
public void AddLayout(string name, StructureLayout layout)
{
_layouts[name] = layout;
}
/// <summary>
/// Parses an XML element representing an array field and adds the field
/// information to a structure layout.
/// </summary>
/// <param name="layout">The structure layout to add the field's information to.</param>
/// <param name="element">The XML element to parse.</param>
/// <param name="name">The name of the field to add.</param>
/// <param name="offset">The offset (in bytes) of the field from the beginning of the structure.</param>
private static void HandleArrayElement(StructureLayout layout, XElement element, string name, int offset)
{
int count = GetNumericAttribute(element, "count");
int entrySize = GetNumericAttribute(element, "entrySize");
layout.AddArrayField(name, offset, count, entrySize, XMLLayoutLoader.LoadLayout(element));
}
/// <summary>
/// Parses an XML element representing an raw byte array and adds the
/// field information to a structure layout.
/// </summary>
/// <param name="layout">The structure layout to add the field's information to.</param>
/// <param name="element">The XML element to parse.</param>
/// <param name="name">The name of the field to add.</param>
/// <param name="offset">The offset (in bytes) of the field from the beginning of the structure.</param>
private static void HandleRawElement(StructureLayout layout, XElement element, string name, int offset)
{
int size = GetNumericAttribute(element, "size");
layout.AddRawField(name, offset, size);
}
/// <summary>
/// Parses an XML element and adds the field that it represents to a
/// structure layout.
/// </summary>
/// <param name="layout">The layout to add the parsed field to.</param>
/// <param name="element">The element to parse.</param>
private static void HandleElement(StructureLayout layout, XElement element)
{
// Every structure field at least has a name and an offset
string name = GetStringAttribute(element, "name");
int offset = GetNumericAttribute(element, "offset");
if (IsArrayElement(element))
HandleArrayElement(layout, element, name, offset);
else if (IsRawElement(element))
HandleRawElement(layout, element, name, offset);
else
HandleBasicElement(layout, element, name, offset);
}
/// <summary>
/// Parses an XML element representing a basic structure field and adds
/// the field information to a structure layout.
/// </summary>
/// <param name="layout">The structure layout to add the field's information to.</param>
/// <param name="element">The XML element to parse.</param>
/// <param name="name">The name of the field to add.</param>
/// <param name="offset">The offset (in bytes) of the field from the beginning of the structure.</param>
private static void HandleBasicElement(StructureLayout layout, XElement element, string name, int offset)
{
StructureValueType type = IdentifyValueType(element.Name.LocalName);
layout.AddBasicField(name, type, offset);
}
private List<IScript> LoadScripts(StructureValueCollection values, IReader reader, MetaAddressConverter addrConverter, IStringIDSource stringIDs, ExpressionTable expressions, StructureLayout entryLayout, BuildInformation buildInfo)
{
int script = (int)values.GetNumber("number of scripts");
ScriptsLocation = new Pointer(values.GetNumber("script table address"), addrConverter);
// Read all of the script entries first, then go back and create the objects
// ThirdGenScript reads parameters from its constructor - this may or may not need cleaning up to make this more obvious
reader.SeekTo(ScriptsLocation.AsOffset());
List<StructureValueCollection> scriptData = new List<StructureValueCollection>();
for (int i = 0; i < script; i++)
scriptData.Add(StructureReader.ReadStructure(reader, entryLayout));
List<IScript> result = new List<IScript>();
foreach (StructureValueCollection scriptValues in scriptData)
result.Add(new ThirdGenScript(reader, scriptValues, addrConverter, stringIDs, expressions, buildInfo));
return result;
}
private List<IGlobalObject> LoadScriptObjects(StructureValueCollection values, IReader reader, MetaAddressConverter addrConverter, IStringIDSource stringIDs, StructureLayout entryLayout)
{
int objectsCount = (int)values.GetNumber("number of script objects");
ScriptObjectsLocation = new Pointer(values.GetNumber("script object table address"), addrConverter);
List<IGlobalObject> result = new List<IGlobalObject>();
reader.SeekTo(ScriptObjectsLocation.AsOffset());
for (int i = 0; i < objectsCount; i++)
{
StructureValueCollection objValues = StructureReader.ReadStructure(reader, entryLayout);
result.Add(new ThirdGenGlobalObject(objValues, stringIDs));
}
return result;
}
private List<IGlobal> LoadScriptGlobals(StructureValueCollection values, IReader reader, MetaAddressConverter addrConverter, ExpressionTable expressions, StructureLayout entryLayout)
{
int globalsCount = (int)values.GetNumber("number of script globals");
ScriptGlobalsLocation = new Pointer(values.GetNumber("script global table address"), addrConverter);
List<IGlobal> result = new List<IGlobal>();
reader.SeekTo(ScriptGlobalsLocation.AsOffset());
for (int i = 0; i < globalsCount; i++)
{
StructureValueCollection globalValues = StructureReader.ReadStructure(reader, entryLayout);
result.Add(new ThirdGenGlobal(globalValues, expressions));
}
return result;
}
private void FindLanguageTable(BuildInformation buildInfo, out ITag tag, out StructureLayout layout)
{
// Check for a PATG tag, and if one isn't found, then use MATG
tag = null;
layout = null;
if (buildInfo.HasLayout("patg"))
{
tag = FindTagByClass(PatgMagic);
layout = buildInfo.GetLayout("patg");
}
if (tag == null)
{
tag = FindTagByClass(MatgMagic);
layout = buildInfo.GetLayout("matg");
}
if (tag == null || layout == null)
throw new InvalidOperationException("The cache file is missing locale information.");
}
/// <summary>
/// Reads an array of values from the stream and adds it to the value
/// collection which is currently being built.
/// </summary>
/// <param name="name">The name to store the array under.</param>
/// <param name="offset">The array's offset (in bytes) from the beginning of the structure.</param>
/// <param name="count">The number of elements to read into the array.</param>
/// <param name="entrySize">The size (in bytes) of each element in the array.</param>
/// <param name="entryLayout">The layout to follow for each entry in the array.</param>
public void VisitArrayField(string name, int offset, int count, int entrySize, StructureLayout entryLayout)
{
StructureValueCollection[] arrayValue = new StructureValueCollection[count];
for (int i = 0; i < count; i++)
{
_reader.SeekTo(_baseOffset + offset + i * entrySize);
arrayValue[i] = ReadStructure(_reader, entryLayout);
}
_collection.SetArray(name, arrayValue);
}
/// <summary>
/// Reads a structure from a stream by following a predefined structure layout.
/// </summary>
/// <param name="reader">The IReader to read the structure from.</param>
/// <param name="layout">The structure layout to follow.</param>
/// <returns>A collection of the values that were read.</returns>
/// <seealso cref="StructureLayout"/>
public static StructureValueCollection ReadStructure(IReader reader, StructureLayout layout)
{
StructureReader structReader = new StructureReader(reader, layout);
layout.Accept(structReader);
return structReader._collection;
}
/// <summary>
/// Constructs a new array field.
/// </summary>
/// <param name="name">The name of the array.</param>
/// <param name="offset">The offset (in bytes) of the array from the beginning of the structure.</param>
/// <param name="count">The number of entries in the array.</param>
/// <param name="entrySize">The size of each entry in the array.</param>
/// <param name="entryLayout">The layout of each entry in the array.</param>
public ArrayField(string name, int offset, int count, int entrySize, StructureLayout entryLayout)
{
_name = name;
_offset = offset;
_count = count;
_entrySize = entrySize;
_subLayout = entryLayout;
}
/// <summary>
/// Adds an array field to the structure layout.
/// </summary>
/// <param name="name">The name of the array.</param>
/// <param name="offset">The offset (in bytes) of the array from the beginning of the structure.</param>
/// <param name="count">The number of entries in the array.</param>
/// <param name="entrySize">The size of each entry in the array.</param>
/// <param name="entryLayout">The layout of each entry in the array.</param>
public void AddArrayField(string name, int offset, int count, int entrySize, StructureLayout entryLayout)
{
_fields.Add(new ArrayField(name, offset, count, entrySize, entryLayout));
}
private ExpressionTable LoadScriptExpressions(StructureValueCollection values, IReader reader, MetaAddressConverter addrConverter, StringTableReader stringReader, StructureLayout entryLayout)
{
int exprCount = (int)values.GetNumber("number of script expressions");
ScriptExpressionsLocation = new Pointer(values.GetNumber("script expression table address"), addrConverter);
ExpressionTable result = new ExpressionTable();
reader.SeekTo(ScriptExpressionsLocation.AsOffset());
for (int i = 0; i < exprCount; i++)
{
StructureValueCollection exprValues = StructureReader.ReadStructure(reader, entryLayout);
result.AddExpression(new ThirdGenExpression(exprValues, (ushort)i, stringReader));
}
foreach (IExpression expr in result)
{
// FIXME: hax
if (expr != null)
((ThirdGenExpression)expr).ResolveReferences(result);
}
return result;
}
