/// <summary>
/// Decodes a <see cref="ByteBuffer"/> into an archive.
/// </summary>
/// <param name="buffer">The buffer to decode</param>
/// <param name="size">The size of the archive</param>
/// <returns>An <see cref="Archive"/> with the decoded byte buffer</returns>
public static Archive DecodeArchive(ByteBuffer buffer, int size)
{
var archive = new Archive(size);
/* read the number of chunks at the end of the archive */
buffer.position(buffer.limit() - 1);
var chunks = buffer.get() & 0xFF;
var chunkSizes = ArrayUtility.AsRectangularArray <int>(chunks, size);
var sizes = new int[size];
buffer.position(buffer.limit() - 1 - chunks * size * 4);
for (var chunk = 0; chunk < chunks; chunk++)
{
var chunkSize = 0;
for (var id = 0; id < size; id++)
{
/* read the delta-encoded chunk length */
var delta = buffer.getInt();
chunkSize += delta;
chunkSizes[chunk][id] = chunkSize; // store the size of this chunk
sizes[id] += chunkSize; // and add it to the size of the whole file
}
}
/* allocate the buffers for the child entries */
for (var id = 0; id < size; id++)
{
archive.Entries[id] = ByteBuffer.allocate(sizes[id]);
}
/* read the data into the buffers */
buffer.position(0);
for (var chunk = 0; chunk < chunks; chunk++)
{
for (var id = 0; id < size; id++)
{
var chunkSize = chunkSizes[chunk][id];
var temp = new byte[chunkSize];
buffer.get(temp);
archive.Entries[id].put(temp);
}
}
/* flip all of the buffers */
for (var id = 0; id < size; id++)
{
archive.Entries[id].flip();
}
return(archive);
}
