public bool OpenAndRead()
{
bool Result = false;
// Open the archive for reading.
if (OpenArchive(false) == false)
{
// Failed to open the archive.
return(false);
}
// Make sure the file is large enough to have the header.
if (this.fileStream.Length < ArchiveHeader.kSizeOf)
{
// File is too small to be a valid archive.
goto Cleanup;
}
// Read the archive header.
ArchiveHeader header = new ArchiveHeader();
header.Magic = reader.ReadInt32();
header.Version = reader.ReadInt16();
header.NumberOfFiles = reader.ReadInt16();
// Verify the header magic.
if (header.Magic != ArchiveHeader.kHeaderMagic1)
{
// Check if the magic is in big endian.
if (EndianUtilities.ByteFlip32(header.Magic) == ArchiveHeader.kHeaderMagic1)
{
// Set the endianness for future IO operations.
this.Endian = Endianness.Big;
this.reader.Endian = Endianness.Big;
// Correct the header values we already read.
header.Magic = EndianUtilities.ByteFlip32(header.Magic);
header.Version = EndianUtilities.ByteFlip16(header.Version);
header.NumberOfFiles = EndianUtilities.ByteFlip16(header.NumberOfFiles);
}
else
{
// archive header has invalid magic.
goto Cleanup;
}
}
// Verify the file version.
if (header.Version != ArchiveHeader.kVersion)
{
// archive is invalid version.
goto Cleanup;
}
// Loop for the number of files and read each file entry.
for (int i = 0; i < header.NumberOfFiles; i++)
{
ArchiveFileEntry fileEntry = new ArchiveFileEntry();
// Save the current position and read the file name.
long offset = this.reader.BaseStream.Position;
fileEntry.FileName = this.reader.ReadNullTerminatedString();
// Advance to the end of the file name and read the rest of the file entry structure.
this.reader.BaseStream.Position = offset + 64;
int fileType = this.reader.ReadInt32();
fileEntry.CompressedSize = this.reader.ReadInt32();
fileEntry.DecompressedSize = this.reader.ReadInt32();
fileEntry.DataOffset = this.reader.ReadInt32();
// Create a unique file id for the file.
fileEntry.FileId = this.nextFileId++;
// Check if the type of file is known.
if (GameResource.KnownResourceTypes.ContainsKey(fileType) == true)
{
// Set the file type and add it as a file extension to the file name.
fileEntry.FileType = GameResource.KnownResourceTypes[fileType];
fileEntry.FileName += "." + fileEntry.FileType.ToString();
}
else
{
fileEntry.FileType = ResourceType.Unknown;
}
// Calculate the unique id for the file and add it to the file loopup dictionary.
this.fileEntryLookupDictionary.Add(fileEntry.FileId, this.fileEntries.Count);
// Add the file entry to the list of files.
this.fileEntries.Add(fileEntry);
}
// Successfully parsed the archive.
Result = true;
Cleanup:
// Close the archive.
CloseArchive();
// Return the result.
return(Result);
}