public int readNodeFromBitArrStream(PvfHeader header, FileStream fs, byte[] unpackedHeaderTree, int offsite)
{
try
{
fileNumber = BitConverter.ToUInt32(unpackedHeaderTree, offsite);
filePathLength = BitConverter.ToInt32(unpackedHeaderTree, offsite + 4);
byte[] filePath = new byte[filePathLength];
Array.Copy(unpackedHeaderTree, offsite + 8, filePath, 0, filePathLength);
fileLength = BitConverter.ToInt32(unpackedHeaderTree, (offsite + filePathLength) + 8);
fileCrc32 = BitConverter.ToUInt32(unpackedHeaderTree, (offsite + filePathLength) + 12);
relativeOffset = BitConverter.ToInt32(unpackedHeaderTree, (offsite + filePathLength) + 0x10);
if (fileLength > 0)
{
computedFileLength = (int)((fileLength + 3L) & 4294967292L);
unpackedFileByteArr = new byte[computedFileLength];
fs.Seek(Marshal.SizeOf(typeof(PvfHeader)) + header.dirTreeLength + relativeOffset, SeekOrigin.Begin);
fs.Read(unpackedFileByteArr, 0, computedFileLength);
Util.unpackHeaderTree(ref unpackedFileByteArr, computedFileLength, fileCrc32);
for (int i = 0; i < (computedFileLength - fileLength); i++)
{
unpackedFileByteArr[fileLength + i] = 0;
}
}
filePathName = Encoding.GetEncoding(0x3b5).GetString(filePath).TrimEnd(new char[1]);//CP949(韩语)
return(filePathLength + 20);
}
catch
{
return(-1);
}
}
public Dictionary <string, string> nStringMap = new Dictionary <string, string>(); //n_string.lst文件的索引键值关系，键值均为字符串
/*
* pvf共分三部分：Header头，Tree文件索引头，文件内容数据，本类中：
* 使用struct PvfHeader{}来存储Header头，在本类中为header对象
* 使用Dictionary<string, HeaderTreeNode> headerTreeCache来存储Tree文件索引头，键为文件索引的文件名，值为索引对象
* 使用HeaderTreeNode的索引对象存储文件内容，详情请看本类构造方法。
*/
public Pvf(string file) //本构造方法使用后需dispose释放内存，构造过程请放到线程中异步调用。
{
fs = new FileStream(file, FileMode.Open); //打开文件
header = (PvfHeader)Util.readFileAsType(fs, typeof(PvfHeader)); //读取pvf文件头结构体到header变量
int headLength = header.dirTreeLength; //获取文件索引列表字节总大小
byte[] decryptedTree = new byte[header.dirTreeLength]; //分配内存
fs.Read(decryptedTree, 0, header.dirTreeLength); //读取文件索引列表
Util.unpackHeaderTree(ref decryptedTree, header.dirTreeLength, (uint)header.dirTreeChecksum); //解密，解密后的字节数组为decryptedTree
int pos = 0; //模拟读取字节数组的指针
for (int i = 0; i < header.numFilesInDirTree; i++)
{
HeaderTreeNode item = new HeaderTreeNode();
int a = item.readNodeFromBitArrStream(header, fs, decryptedTree, pos);//从pos位置开始读取HeaderTreeNode对象，返回值为指针应该偏移的字节数
if (a < 0)
{
throw new Exception("读取错误，格式非法"); //读取错误直接报错
}
pos += a; //指针后移
headerTreeCache[item.filePathName] = item; //把对象放入字典，以文件名为键
}
loadStringTableBin(headerTreeCache["stringtable.bin"].unpackedFileByteArr); //读取stringtable.bin文件创建stringtable索引
loadNStringLst(headerTreeCache["n_string.lst"].unpackedFileByteArr); //读取n_string.lst文件创建n_string索引
return;
}