public static void Pack(string directory, string filename)
{
List<FileInfo> infos = new List<FileInfo>();
LzmaDecoder decoder = new LzmaDecoder();
// Figure out the info for each file we need to compress.
foreach (string fn in Directory.GetFiles(directory, "*.lzma")) {
// Remove the extension.
infos.Add(new FileInfo(fn));
}
string tempFilename = Path.GetTempFileName();
using (var output = File.OpenWrite(filename)) {
// First pass: write file table to output, and combine files.
//
// File table format:
// <number entries>
// file1: <name> <lzma size> <uncompressed size>
// file2: <name> <lzma size> <uncompressed size>
// ......
// filen: <name> <lzma size> <uncompressed size>
using (BinaryWriter writer = new BinaryWriter(output)) {
writer.Write(infos.Count);
using (var tempFile = File.OpenWrite(tempFilename))
foreach (FileInfo fi in infos) {
writer.Write(fi.Name);
writer.Write(fi.Length);
// Decompress this file to the temp blob.
using (var thisFile = fi.OpenRead()) {
long uncompressedSize = PrepareDecoder(decoder, thisFile);
decoder.Code(thisFile, tempFile, thisFile.Length, uncompressedSize, null);
writer.Write(uncompressedSize);
thisFile.Pipe(tempFile);
}
}
// Second pass: write LZMA header to output, and compress the temp blob
// into the output file.
LzmaEncoder encoder = new LzmaEncoder();
using (var tempFile = File.OpenRead(tempFilename)) {
WriteHeader(encoder, tempFile, output);
encoder.Code(tempFile, output, -1, -1, null);
}
}
}
}
private void WriteCompressedFile(Image screenshot)
{
LzmaEncoder encoder = new LzmaEncoder();
using (MemoryStream buffer = new MemoryStream()) {
_params.Writer.Write(screenshot, buffer);
// Rewind stream
buffer.Seek(0, SeekOrigin.Begin);
// LZMA encode from memory to file
using (var output = File.OpenWrite(CreateFilename())) {
Lzma.WriteHeader(encoder, buffer, output);
encoder.Code(buffer, output, -1, -1, null);
}
}
}
public static void WriteHeader(LzmaEncoder encoder, Stream input, Stream output)
{
encoder.WriteCoderProperties(output);
output.Write(BitConverter.GetBytes(input.Length), 0, sizeof(Int64));
}