public byte[] GetContents(AlfEntry entry)
{
using MemoryMappedViewAccessor accessor = AlfFile.CreateViewAccessor(entry.Offset, entry.Size, MemoryMappedFileAccess.Read);
var data = new byte[entry.Size];
accessor.ReadArray(0, data, 0, entry.Size);
return(data);
}
private void ReadToC()
{
using var file = new BinaryReader(AlfFile.CreateViewStream(0, 0, MemoryMappedFileAccess.Read), Encoding.ASCII);
// Read Identifier "ALF "
if (file.ReadUInt32() != 0x20464c41)
{
throw new InvalidDataException("Die Datei ist kein gültiges ALF-Archiv");
}
// Read File Table
file.BaseStream.Seek(0x0a, SeekOrigin.Begin);
int fileTableOffset = file.ReadInt32();
int numberOfFiles = file.ReadInt16();
file.BaseStream.Seek(fileTableOffset, SeekOrigin.Begin);
for (int i = 0; i < numberOfFiles; i++)
{
var entry = new AlfEntry
{
Index = i
};
char[] nameA = file.ReadChars(13);
entry.Name = new string(nameA, 0, nameA.TakeWhile(c => c != '\0').Count());
file.ReadChar();
entry.Size = file.ReadInt32();
file.ReadChars(6);
entry.Offset = file.ReadInt32() + 0x30;
entry.Archive = this;
AlfEntries.Add(entry);
}
// Read Module Table
file.BaseStream.Seek(0x16, SeekOrigin.Begin);
int moduleTableOffset = file.ReadInt32();
int numberOfModules = file.ReadInt16();
file.BaseStream.Seek(moduleTableOffset, SeekOrigin.Begin);
for (int i = 0; i < numberOfModules; i++)
{
var module = new AlfModule();
char[] nameA = file.ReadChars(14);
module.Name = new string(nameA, 0, nameA.TakeWhile(c => c != '\0').Count());
module.NumberOfFiles = file.ReadInt32();
file.ReadChars(6);
module.FirstIndexMappingTable = file.ReadInt32();
AlfModules.Add(module);
}
// Read Module File Mapping Table
file.BaseStream.Seek(0x1c, SeekOrigin.Begin);
int moduleMappingTableOffset = file.ReadInt32();
file.BaseStream.Seek(moduleMappingTableOffset, SeekOrigin.Begin);
foreach (AlfModule module in AlfModules)
{
for (int i = 0; i < module.NumberOfFiles; i++)
{
ushort idx = file.ReadUInt16();
if (idx == 0xffff)
{
continue;
}
if (idx > AlfEntries.Count)
{
throw new InvalidDataException($"Verweis zeigt auf nicht vorhandene Datei ({file.BaseStream.Position})");
}
AlfEntry newEntry = AlfEntries[idx];
if (!module.AlfEntries.Contains(newEntry))
{
module.AlfEntries.Add(newEntry);
}
}
}
}
public byte[] GetContents(string entryName)
{
AlfEntry entry = Entries.First(e => e.Name == entryName);
return(entry != null?GetContents(entry) : null);
}
