//============================================================
// <T>压缩数据保存为指定文件。</T>
//
// @param fileName 文件名称
//============================================================
public void Compress(string fileName)
{
// 建立目录
RDirectory.MakeDirectoriesForFile(fileName);
// 输出文件
byte[] data = InnerCompress(_memory, 0, _length);
using (FByteFile file = new FByteFile()) {
file.Assign(data, 0, data.Length);
file.SaveFile(fileName);
}
}
//============================================================
// <T>分块压缩保存为字节数组指定文件。</T>
//
// @param fileName 文件名称
// @param blockSize 分块大小
//============================================================
public void BlockCompress(string fileName, int blockSize)
{
// 检查参数
if (null == fileName)
{
throw new FFatalException("File name is null.");
}
// 存储文件
using (FByteFile file = new FByteFile()) {
BlockCompress(file, blockSize);
file.SaveFile(fileName);
}
}
//============================================================
// <T>解压缩方法</T>
//
// @param fileName 文件名称
//============================================================
public void BlockDecompress(string fileName)
{
// 检查参数
if (null == fileName)
{
throw new FFatalException("File name is null.");
}
FByteFile file = new FByteFile();
file.LoadFile(fileName);
// 读取出原来的长度
int length = file.ReadInt32();
byte[] buffer = new byte[length];
// 读取出分割的块数
int spiltCount = file.ReadInt32();
int remain = file.Position;
for (int i = 0; i < spiltCount; i++)
{
using (MemoryStream stream = new MemoryStream()) {
int blockLength = file.ReadInt32();
remain += 4;
// 定长的数据
stream.Write(file.Memory, remain, blockLength);
file.Position += blockLength;
remain += blockLength;
stream.Position = 0;
using (DeflateStream deflate = new DeflateStream(stream, CompressionMode.Decompress, true)) {
int readed = deflate.Read(buffer, 0, length);
if (readed == 0)
{
throw new FFatalException("");
}
Append(buffer, 0, readed);
}
}
}
}
//============================================================
// <T>压缩方法</T>
//============================================================
public void NotBlockCompress(int size)
{
if (0 == size)
{
throw new FFatalException("Size is zero.");
}
FByteFile file = new FByteFile();
// 计算分割块数
int splitCount = _length / size;
if (0 != (_length % size))
{
splitCount++;
}
// 写入压缩前的长度
file.WriteUint32((UInt32)_length);
// 写入分割块数
file.WriteUint32((UInt32)splitCount);
// 分段压缩数据
int position = 0;
int remain = _length;
for (int n = 0; n < splitCount; n++)
{
MemoryStream stream = new MemoryStream();
DeflateStream deflate = new DeflateStream(stream, CompressionMode.Compress, true);
deflate.Write(_memory, position, Math.Min(size, remain));
position += size;
remain -= size;
deflate.Close();
// 输出压缩后数据
int compressLength = (int)stream.Length;
file.WriteUint32((UInt32)compressLength);
file.WriteBytes(stream.ToArray(), 0, compressLength);
stream.Close();
}
Clear();
WriteBytes(file.ToArray(), 0, file.Length);
}
