private void ReadHeaderAndIndexSection()
{
// Read file header (16 bytes):
// 0-3: file signature (0x64)
// 4-7: number of files
// 8-11: offset of file name area.
// 12-15: size of file name area.
if (reader.ReadInt32() != 0x64)
throw new InvalidDataException("File signature mismatch.");
uint numFiles = reader.ReadUInt32();
uint indexOffset = reader.ReadUInt32();
uint indexSize = reader.ReadUInt32();
// Read file names. For each file name entry, the format is:
// 2 bytes: (X) length of file name, in characters
// X or 2X bytes: file name (encoded in GBK or UCS2)
// 4 bytes: all zero; this marks the end of file name
// 4 bytes: file offset
// 4 bytes: original file size
// 4 bytes: file size (packed)
reader.BaseStream.Seek(indexOffset, SeekOrigin.Begin);
entries = new List<PkgArchiveEntry>();
byte[] buffer = new byte[65536 * 2];
for (uint i = 0; i < numFiles; i++)
{
PkgArchiveEntryInfo info = new PkgArchiveEntryInfo();
info.IndexOffset = (int)reader.BaseStream.Position;
//PkgArchiveEntry entry = new PkgArchiveEntry();
//entry.PackagePath = filename;
ushort length = reader.ReadUInt16();
if (reader.Read(buffer, 0, length + 4) != length + 4)
throw new InvalidDataException("Premature end of file.");
if (buffer[length] == 0 && buffer[length + 1] == 0 &&
buffer[length + 2] == 0 && buffer[length + 3] == 0)
{
// Encoded in GBK
info.FileName = Encoding.GetEncoding("GBK").GetString(buffer, 0, length);
info.IsFileNameInUnicode = false;
}
else
{
// Encoded in UCS-2
if (reader.Read(buffer, length + 4, length) != length)
throw new InvalidDataException("Premature end of file.");
info.FileName = Encoding.Unicode.GetString(buffer, 0, length * 2);
info.IsFileNameInUnicode = true;
}
info.IndexSize = (int)reader.BaseStream.Position - info.IndexOffset;
info.ContentOffset = reader.ReadInt32();
info.OriginalSize = reader.ReadInt32();
info.ContentSize = reader.ReadInt32();
entries.Add(new PkgArchiveEntry(this, info));
}
}
internal PkgArchiveEntry(PkgArchive archive, PkgArchiveEntryInfo info)
{
this.archive = archive;
this.info = info;
}
