private void CacheFilePositions()
{
// get list of all files
List <EmbeddedFileEntry> files = new List <EmbeddedFileEntry>();
FileIDMatcher matcher = delegate { return(true); };
ListFiles(m_rootPointer, files, matcher, null);
// construct dictionary
foreach (EmbeddedFileEntry file in files)
{
m_filePosCache[file.FileID] = file;
}
}
private void ListFiles(uint filePointer, List <EmbeddedFileEntry> destinationList, FileIDMatcher matcher,
object stateObject)
{
byte[] directory = new byte[m_sectorsPerDirectory * m_sectorSize * sizeof(uint)];
// read the directory
Util.UIntToBArr(directory, 0, filePointer);
for (int i = 0; i < m_sectorsPerDirectory && BitConverter.ToUInt32(directory, 0) != 0x00; i++)
{
// always read the next sector pointer into the first position
// of the data array. Then read the rest of the sector to the back
// of the array
filePointer = BitConverter.ToUInt32(directory, 0);
m_inputStream.Seek(filePointer, SeekOrigin.Begin);
m_inputStream.Read(directory, 0, sizeof(uint));
m_inputStream.Read(directory, (i * (m_sectorSize - 1) + 1) * sizeof(uint),
(m_sectorSize - 1) * sizeof(uint));
}
// find the amount of files
int fileCount = BitConverter.ToInt32(directory, m_fileCountOffset * sizeof(uint));
Debug.Assert(fileCount < m_filesPerDirectory);
// add the file numbers to the list
for (int index = 0; index < fileCount; index++)
{
uint fileId =
BitConverter.ToUInt32(directory,
(index * m_entrySize + m_filesPerDirectory + 1 + m_entryDataOffset) *
sizeof(uint));
if (fileId != 0x00)
{
if (matcher(fileId, stateObject))
{
uint fileSize =
BitConverter.ToUInt32(directory,
(index * m_entrySize + m_filesPerDirectory + 3 + m_entryDataOffset) *
sizeof(uint));
EmbeddedFileEntry newEntry = new EmbeddedFileEntry(fileSize, fileId);
if (!destinationList.Contains(newEntry))
{
destinationList.Add(newEntry);
}
}
}
}
// recurse into subdirs, if needed
bool hasSubDirs = (BitConverter.ToUInt32(directory, sizeof(uint)) != 0);
if (hasSubDirs)
{
int max = fileCount;
if (m_canHaveMoreSubDirsThanFiles)
{
max = 62;
}
for (int index = 0; index < max; index++)
{
uint subDirPointer = BitConverter.ToUInt32(directory, index * sizeof(uint) + sizeof(uint));
if (subDirPointer != 0x00)
{
ListFiles(subDirPointer, destinationList, matcher, stateObject);
}
}
}
}
