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// NativeUnzip.cs created with MonoDevelop
// User: alan at 13:11 20/10/2008
//
// To change standard headers go to Edit->Preferences->Coding->Standard Headers
//
using System;
using System.Collections.Generic;
using System.IO;
using System.IO.Packaging;
using System.Runtime.InteropServices;
using System.Text;
namespace zipsharp
{
static class NativeUnzip
{
enum ZipStringComparison
{
OSDefault = 0,
CaseSensitive = 1,
CaseInsensitive = 2
}
public static void CloseArchive (UnzipHandle handle)
{
unzClose (handle);
handle.SetHandleAsInvalid ();
}
public static void CloseCurrentFile (UnzipHandle handle)
{
if (unzCloseCurrentFile (handle) != 0)
throw new Exception ("Could not close the active file");
}
static CompressionOption ConvertCompression (int compressionLevel)
{
switch (compressionLevel)
{
case 1:
case 2:
return CompressionOption.SuperFast;
case 3:
case 4:
return CompressionOption.Fast;
case 5:
case 6:
return CompressionOption.Normal;
case 7:
case 8:
case 9:
return CompressionOption.Maximum;
default:
return CompressionOption.NotCompressed;
}
}
public static long CurrentFilePosition (UnzipHandle handle)
{
return unztell(handle).ToInt64 ();
}
public static long CurrentFileLength (UnzipHandle handle)
{
UnzipFileInfo info;
StringBuilder sbName = new StringBuilder (128);
int result = unzGetCurrentFileInfo (handle, out info, sbName, new IntPtr (sbName.Capacity), IntPtr.Zero, IntPtr.Zero, null, IntPtr.Zero);
if (result != 0)
return -1;
else
return (long)info.UncompressedSize;
}
static string GetCurrentFileName (UnzipHandle handle)
{
UnzipFileInfo info;
StringBuilder sbName = new StringBuilder (128);
int result = unzGetCurrentFileInfo (handle, out info, sbName, new IntPtr (sbName.Capacity), IntPtr.Zero, new IntPtr (0), null, IntPtr.Zero);
if (result != 0)
return null;
else
return sbName.ToString ();
}
public static string[] GetFiles (UnzipHandle handle)
{
List<string> files = new List<string> ();
GoToFirstFile (handle);
string name;
while ((name = GetCurrentFileName(handle)) != null)
{
files.Add (name);
if (!NativeUnzip.GoToNextFile (handle))
break;
}
return files.ToArray ();
}
static void GoToFirstFile (UnzipHandle handle)
{
if (NativeUnzip.unzGoToFirstFile (handle) != 0)
throw new Exception ("Zip file is invalid");
}
static bool GoToNextFile (UnzipHandle handle)
{
return unzGoToNextFile(handle) == 0;
}
public static UnzipHandle OpenArchive (ZlibFileFuncDef fileFuncs)
{
UnzipHandle handle = unzOpen2 ("", ref fileFuncs);
if (handle.IsInvalid)
throw new Exception ("Could not open unzip archive");
return handle;
}
public static void OpenFile (UnzipHandle handle, string name, out CompressionOption level)
{
if (unzLocateFile (handle, name, (int) ZipStringComparison.CaseInsensitive) != 0)
throw new Exception ("The file doesn't exist");
int method, compression;
// '0' means do not open in raw mode (raw == do not decompress)
if (unzOpenCurrentFile2 (handle, out method, out compression, 0) != 0)
throw new Exception ("The file could not be opened");
level = ConvertCompression (method == 0 ? 0 : compression);
}
public static unsafe int Read (UnzipHandle handle, byte[] buffer, int offset, int count)
{
if ((buffer.Length - offset) > count)
throw new ArgumentOutOfRangeException ("count", "Buffer is too small to read that amount of data");
fixed (byte * b = &buffer[offset])
return unzReadCurrentFile (handle, b, (uint)count);
}
[DllImport ("MonoPosixHelper")]
static extern int unzCloseCurrentFile (UnzipHandle handle);
[DllImport ("MonoPosixHelper")]
static extern IntPtr unztell (UnzipHandle handle);
[DllImport ("MonoPosixHelper")]
static extern int unzGoToFirstFile (UnzipHandle handle);
[DllImport ("MonoPosixHelper")]
static extern UnzipHandle unzOpen2 (string path,
ref ZlibFileFuncDef pzlib_filefunc_def);
[DllImport ("MonoPosixHelper")]
static extern int unzGoToNextFile (UnzipHandle handle);
[DllImport ("MonoPosixHelper")]
static extern int unzLocateFile (UnzipHandle handle,
string szFileName,
int iCaseSensitivity);
[DllImport ("MonoPosixHelper")]
static extern int unzOpenCurrentFile2 (UnzipHandle handle,
out int method,
out int level,
int raw);
[DllImport ("MonoPosixHelper")]
static extern int unzGetCurrentFileInfo (UnzipHandle handle,
out UnzipFileInfo pfile_info,
StringBuilder szFileName,
IntPtr fileNameBufferSize, // uLong
IntPtr extraField, // void *
IntPtr extraFieldBufferSize, // uLong
StringBuilder szComment,
IntPtr commentBufferSize); // uLong
[DllImport ("MonoPosixHelper")]
static unsafe extern int unzReadCurrentFile (UnzipHandle handle,
byte* buf, // voidp
uint len);
//[DllImport ("MonoPosixHelper")]
//static extern int unzSetOffset (UnzipHandle handle, IntPtr pos); // uLong
[DllImport ("MonoPosixHelper")]
static extern int unzClose (UnzipHandle handle);
}
}
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