public Byte[] Extract(CentralDirectoryFileHeader header)
{
var local = new LocalFileHeader(header.Bytes, header.RelativeOffsetOfLocalFileHeader);
var pos = local.Offset + local.Length;
var dst = new Byte[local.UncompressedSize];
#if true
using (var s = new MemoryStream(header.Bytes, pos, local.CompressedSize, false))
using (var deflateStream = new DeflateStream(s, CompressionMode.Decompress))
{
int dst_pos = 0;
for (int remain = dst.Length; remain > 0;)
{
var readSize = deflateStream.Read(dst, dst_pos, remain);
dst_pos += readSize;
remain -= readSize;
}
}
#else
var size = RawInflate.RawInflateImport.RawInflate(dst, 0, dst.Length,
header.Bytes, pos, header.CompressedSize);
#endif
return(dst);
}
public Byte[] Extract(CentralDirectoryFileHeader header)
{
var local = new LocalFileHeader(header.Bytes, header.RelativeOffsetOfLocalFileHeader);
var compressedSize = local.CompressedSize;
var uncompressedSize = local.UncompressedSize;
var pos = local.Offset + local.Length;
if (header.HasDataDescriptor)
{
var descriptor = new DataDescriptor(header.Bytes, pos + header.CompressedSize);
compressedSize = descriptor.CompressedSize;
uncompressedSize = descriptor.UncompressedSize;
}
if (compressedSize != header.CompressedSize)
{
throw new Exception();
}
if (uncompressedSize != header.UncompressedSize)
{
throw new Exception();
}
var dst = new Byte[uncompressedSize];
switch (header.CompressionMethod)
{
case CompressionMethod.Stored:
{
Buffer.BlockCopy(header.Bytes, pos, dst, 0, compressedSize);
}
break;
case CompressionMethod.Deflated:
{
using (var s = new MemoryStream(header.Bytes, pos, compressedSize, false))
using (var deflateStream = new DeflateStream(s, CompressionMode.Decompress))
{
int dst_pos = 0;
for (int remain = dst.Length; remain > 0;)
{
var readSize = deflateStream.Read(dst, dst_pos, remain);
dst_pos += readSize;
remain -= readSize;
}
}
}
break;
default:
throw new NotImplementedException();
}
return(dst);
}
public string ExtractToString(CentralDirectoryFileHeader header, Encoding encoding)
{
var local = new LocalFileHeader(header.Bytes, header.RelativeOffsetOfLocalFileHeader);
var pos = local.Offset + local.Length;
using (var s = new MemoryStream(header.Bytes, pos, local.CompressedSize, false))
using (var deflateStream = new DeflateStream(s, CompressionMode.Decompress))
using (var r = new StreamReader(deflateStream, encoding))
{
return(r.ReadToEnd());
}
}
public ArraySegment <byte> Get(string url)
{
var found = Entries.FirstOrDefault(x => x.FileName == url);
if (found == null)
{
throw new FileNotFoundException("[ZipArchive]" + url);
}
switch (found.CompressionMethod)
{
case CompressionMethod.Deflated:
return(new ArraySegment <byte>(Extract(found)));
case CompressionMethod.Stored:
var local = new LocalFileHeader(found.Bytes, found.RelativeOffsetOfLocalFileHeader);
var pos = local.Offset + local.Length;
return(new ArraySegment <byte>(local.Bytes, pos, local.CompressedSize));
}
throw new NotImplementedException(found.CompressionMethod.ToString());
}
