//============================================================
// <T>加载压缩文件。</T>
//
// @param fileName 文件名称
//============================================================
public void LoadCompress(string fileName)
{
LoadFile(fileName);
_position = 0;
_compressCd = ERsCompress.ToString(ReadUint8());
_dataLength = ReadInt32();
_vertifyCode = ReadInt32();
_blockCount = ReadInt32();
}
//============================================================
// <T>压缩字节数据。</T>
//
// @return 字节数据
//============================================================
public byte[] CompressBytes()
{
byte[] data = null;
// Deflate压缩
string compressCd = _compressCd;
switch (compressCd)
{
case ERsCompress.Deflate:
using (FCompressFile file = new FCompressFile()) {
file.Append(_memory, 0, _length);
if (_blockSize > 0)
{
data = file.BlockCompress(_blockSize);
}
else
{
data = file.Compress();
}
}
break;
case ERsCompress.Lzma:
using (FLzmaFile file = new FLzmaFile()) {
file.Append(_memory, 0, _length);
if (_blockSize > 0)
{
data = file.BlockCompress(_blockSize);
}
else
{
data = file.Compress();
}
}
break;
case ERsCompress.LzmaAlchemy:
using (FLzmaFile file = new FLzmaFile()) {
file.Append(_memory, 0, _length);
if (_blockSize > 0)
{
data = file.BlockCompressNative(_blockSize);
}
else
{
data = file.CompressNative();
}
}
break;
}
// 检查大小，如果压缩后更大，则不压缩数据
if (data.Length > _length)
{
data = ToArray();
compressCd = ERsCompress.None;
}
// 计算效验码
_vertifyCode = RByte.ComputeHash32(data, 0, data.Length);
// 写入文件
byte[] result = null;
using (FByteStream stream = new FByteStream()) {
// 写入信息
stream.WriteUint8((byte)ERsCompress.Parse(compressCd));
stream.WriteInt32(_length);
stream.WriteInt32(_vertifyCode);
stream.WriteInt32(_blockSize);
// 写入数据
if ((ERsCompress.None != compressCd) && (_blockSize > 0))
{
stream.WriteBytes(data, 0, data.Length);
}
else
{
stream.WriteInt32(1);
stream.WriteInt32(data.Length);
stream.WriteBytes(data, 0, data.Length);
}
result = stream.ToArray();
}
return(result);
}
