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//
// Copyright (c) ZeroC, Inc. All rights reserved.
//
namespace IceInternal
{
using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
internal static class SafeNativeMethods
{
[DllImport("bzip2.dll", EntryPoint="BZ2_bzlibVersion", ExactSpelling=true)]
internal static extern IntPtr windowsBZ2_bzlibVersion();
[DllImport("bzip2.dll", EntryPoint="BZ2_bzBuffToBuffCompress", ExactSpelling=true)]
internal static extern int windowsBZ2_bzBuffToBuffCompress(byte[] dest,
ref int destLen,
byte[] source,
int sourceLen,
int blockSize100k,
int verbosity,
int workFactor);
[DllImport("bzip2.dll", EntryPoint="BZ2_bzBuffToBuffDecompress", ExactSpelling=true)]
internal static extern int windowsBZ2_bzBuffToBuffDecompress(byte[] dest,
ref int destLen,
byte[] source,
int sourceLen,
int small,
int verbosity);
[DllImport("libbz2.so.1", EntryPoint="BZ2_bzlibVersion", ExactSpelling=true)]
internal static extern IntPtr unixBZ2_1_bzlibVersion();
[DllImport("libbz2.so.1", EntryPoint="BZ2_bzBuffToBuffCompress", ExactSpelling=true)]
internal static extern int unixBZ2_1_bzBuffToBuffCompress(byte[] dest,
ref int destLen,
byte[] source,
int sourceLen,
int blockSize100k,
int verbosity,
int workFactor);
[DllImport("libbz2.so.1", EntryPoint="BZ2_bzBuffToBuffDecompress", ExactSpelling=true)]
internal static extern int unixBZ2_1_bzBuffToBuffDecompress(byte[] dest,
ref int destLen,
byte[] source,
int sourceLen,
int small,
int verbosity);
[DllImport("libbz2.so.1.0", EntryPoint="BZ2_bzlibVersion", ExactSpelling=true)]
internal static extern IntPtr unixBZ2_10_bzlibVersion();
[DllImport("libbz2.so.1.0", EntryPoint="BZ2_bzBuffToBuffCompress", ExactSpelling=true)]
internal static extern int unixBZ2_10_bzBuffToBuffCompress(byte[] dest,
ref int destLen,
byte[] source,
int sourceLen,
int blockSize100k,
int verbosity,
int workFactor);
[DllImport("libbz2.so.1.0", EntryPoint="BZ2_bzBuffToBuffDecompress", ExactSpelling=true)]
internal static extern int unixBZ2_10_bzBuffToBuffDecompress(byte[] dest,
ref int destLen,
byte[] source,
int sourceLen,
int small,
int verbosity);
[DllImport("libbz2.dylib", EntryPoint="BZ2_bzlibVersion", ExactSpelling=true)]
internal static extern IntPtr macOSBZ2_bzlibVersion();
[DllImport("libbz2.dylib", EntryPoint="BZ2_bzBuffToBuffCompress", ExactSpelling=true)]
internal static extern int macOSBZ2_bzBuffToBuffCompress(byte[] dest,
ref int destLen,
byte[] source,
int sourceLen,
int blockSize100k,
int verbosity,
int workFactor);
[DllImport("libbz2.dylib", EntryPoint="BZ2_bzBuffToBuffDecompress", ExactSpelling=true)]
internal static extern int macOSBZ2_bzBuffToBuffDecompress(byte[] dest,
ref int destLen,
byte[] source,
int sourceLen,
int small,
int verbosity);
}
delegate int CompressBuffer(byte[] dest,
ref int destLen,
byte[] source,
int sourceLen,
int blockSize100k,
int verbosity,
int workFactor);
delegate int DecompressBuffer(byte[] dest,
ref int destLen,
byte[] source,
int sourceLen,
int small,
int verbosity);
public class BZip2
{
static BZip2()
{
//
// Simple trick to find out whether bzip2 is installed: Call the BZ2_bzlibVersion() function in the
// library. If we get an exception, the library is not available.
//
_bzlibInstalled = false;
_bzlibName = "";
try
{
if(AssemblyUtil.isWindows)
{
_bzlibName = "bzip2.dll";
SafeNativeMethods.windowsBZ2_bzlibVersion();
}
else if(AssemblyUtil.isMacOS)
{
_bzlibName = "libbz2.dylib";
SafeNativeMethods.macOSBZ2_bzlibVersion();
}
else
{
try
{
_bzlibName = "libbz2.so.1.0";
SafeNativeMethods.unixBZ2_10_bzlibVersion();
}
catch(TypeLoadException)
{
_bzlibName = "libbz2.so.1";
SafeNativeMethods.unixBZ2_1_bzlibVersion();
}
}
_bzlibInstalled = true;
}
catch(EntryPointNotFoundException)
{
Console.Error.WriteLine("warning: found " + _bzlibName + " but entry point BZ2_bzlibVersion is missing.");
}
catch(TypeLoadException)
{
// Expected -- bzip2 lib not installed or not in PATH.
}
catch(BadImageFormatException ex)
{
string lib = _bzlibName;
if(!String.IsNullOrEmpty(ex.FileName))
{
lib = ex.FileName; // Future-proof: we'll do the right thing if the FileName member is non-empty.
}
Console.Error.Write("warning: " + lib + " could not be loaded (likely due to 32/64-bit mismatch).");
if(IntPtr.Size == 8)
{
Console.Error.Write(" Make sure the directory containing the 64-bit " + lib + " is in your PATH.");
}
Console.Error.WriteLine();
}
if(AssemblyUtil.isWindows)
{
_compressBuffer = (byte[] dest, ref int destLen, byte[] source, int sourceLen, int blockSize100k,
int verbosity, int workFactor) =>
{
return SafeNativeMethods.windowsBZ2_bzBuffToBuffCompress(dest, ref destLen, source, sourceLen,
blockSize100k, verbosity, workFactor);
};
_decompressBuffer = (byte[] dest, ref int destLen, byte[] source, int sourceLen, int small,
int verbosity) =>
{
return SafeNativeMethods.windowsBZ2_bzBuffToBuffDecompress(dest, ref destLen, source, sourceLen,
small, verbosity);
};
}
else if(AssemblyUtil.isMacOS)
{
_compressBuffer = (byte[] dest, ref int destLen, byte[] source, int sourceLen, int blockSize100k,
int verbosity, int workFactor) =>
{
return SafeNativeMethods.macOSBZ2_bzBuffToBuffCompress(dest, ref destLen, source, sourceLen,
blockSize100k, verbosity, workFactor);
};
_decompressBuffer = (byte[] dest, ref int destLen, byte[] source, int sourceLen, int small,
int verbosity) =>
{
return SafeNativeMethods.macOSBZ2_bzBuffToBuffDecompress(dest, ref destLen, source, sourceLen,
small, verbosity);
};
}
else
{
if(_bzlibName == "libbz2.so.1.0")
{
_compressBuffer = (byte[] dest, ref int destLen, byte[] source, int sourceLen, int blockSize100k,
int verbosity, int workFactor) =>
{
return SafeNativeMethods.unixBZ2_10_bzBuffToBuffCompress(dest, ref destLen, source,
sourceLen, blockSize100k,
verbosity, workFactor);
};
_decompressBuffer = (byte[] dest, ref int destLen, byte[] source, int sourceLen, int small,
int verbosity) =>
{
return SafeNativeMethods.unixBZ2_10_bzBuffToBuffDecompress(dest, ref destLen, source,
sourceLen, small, verbosity);
};
}
else
{
_compressBuffer = (byte[] dest, ref int destLen, byte[] source, int sourceLen, int blockSize100k,
int verbosity, int workFactor) =>
{
return SafeNativeMethods.unixBZ2_1_bzBuffToBuffCompress(dest, ref destLen, source,
sourceLen, blockSize100k, verbosity,
workFactor);
};
_decompressBuffer = (byte[] dest, ref int destLen, byte[] source, int sourceLen, int small,
int verbosity) =>
{
return SafeNativeMethods.unixBZ2_1_bzBuffToBuffDecompress(dest, ref destLen, source,
sourceLen, small, verbosity);
};
}
}
}
static string getBZ2Error(int error)
{
string rc;
switch(error)
{
case BZ_SEQUENCE_ERROR:
{
rc = "BZ_SEQUENCE_ERROR";
break;
}
case BZ_PARAM_ERROR:
{
rc = "BZ_PARAM_ERROR";
break;
}
case BZ_MEM_ERROR:
{
rc = "BZ_MEM_ERROR";
break;
}
case BZ_DATA_ERROR:
{
rc = "BZ_DATA_ERROR";
break;
}
case BZ_DATA_ERROR_MAGIC:
{
rc = "BZ_DATA_ERROR_MAGIC";
break;
}
case BZ_IO_ERROR:
{
rc = "BZ_IO_ERROR";
break;
}
case BZ_UNEXPECTED_EOF:
{
rc = "BZ_UNEXPECTED_EOF";
break;
}
case BZ_OUTBUFF_FULL:
{
rc = "BZ_OUTBUFF_FULL";
break;
}
case BZ_CONFIG_ERROR:
{
rc = "BZ_CONFIG_ERROR";
break;
}
default:
{
rc = "Unknown bzip2 error: " + error;
break;
}
}
return rc;
}
public static bool supported()
{
return _bzlibInstalled;
}
public static Buffer compress(Buffer buf, int headerSize, int compressionLevel)
{
Debug.Assert(supported());
//
// Compress the message body, but not the header.
//
int uncompressedLen = buf.size() - headerSize;
byte[] data = buf.b.rawBytes(headerSize, uncompressedLen);
int compressedLen = (int)(uncompressedLen * 1.01 + 600);
byte[] compressed = new byte[compressedLen];
int rc = _compressBuffer(compressed, ref compressedLen, data, uncompressedLen, compressionLevel, 0, 0);
if(rc == BZ_OUTBUFF_FULL)
{
return null;
}
else if(rc < 0)
{
Ice.CompressionException ex = new Ice.CompressionException("BZ2_bzBuffToBuffCompress failed");
ex.reason = getBZ2Error(rc);
throw ex;
}
//
// Don't bother if the compressed data is larger than the
// uncompressed data.
//
if(compressedLen >= uncompressedLen)
{
return null;
}
Buffer r = new Buffer();
r.resize(headerSize + 4 + compressedLen, false);
r.b.position(0);
//
// Copy the header from the uncompressed stream to the
// compressed one.
//
r.b.put(buf.b.rawBytes(0, headerSize));
//
// Add the size of the uncompressed stream before the
// message body.
//
r.b.putInt(buf.size());
//
// Add the compressed message body.
//
r.b.put(compressed, 0, compressedLen);
return r;
}
public static Buffer uncompress(Buffer buf, int headerSize, int messageSizeMax)
{
Debug.Assert(supported());
buf.b.position(headerSize);
int uncompressedSize = buf.b.getInt();
if(uncompressedSize <= headerSize)
{
throw new Ice.IllegalMessageSizeException("compressed size <= header size");
}
if(uncompressedSize > messageSizeMax)
{
IceInternal.Ex.throwMemoryLimitException(uncompressedSize, messageSizeMax);
}
int compressedLen = buf.size() - headerSize - 4;
byte[] compressed = buf.b.rawBytes(headerSize + 4, compressedLen);
int uncompressedLen = uncompressedSize - headerSize;
byte[] uncompressed = new byte[uncompressedLen];
int rc = _decompressBuffer(uncompressed, ref uncompressedLen, compressed, compressedLen, 0, 0);
if(rc < 0)
{
Ice.CompressionException ex = new Ice.CompressionException("BZ2_bzBuffToBuffDecompress failed");
ex.reason = getBZ2Error(rc);
throw ex;
}
Buffer r = new Buffer();
r.resize(uncompressedSize, false);
//
// Copy the header from the compressed buffer to the uncompressed one.
//
r.b.position(0);
r.b.put(buf.b.rawBytes(), 0, headerSize);
r.b.put(uncompressed);
return r;
}
private static bool _bzlibInstalled;
private static string _bzlibName;
private static CompressBuffer _compressBuffer;
private static DecompressBuffer _decompressBuffer;
const int BZ_SEQUENCE_ERROR = -1;
const int BZ_PARAM_ERROR = -2;
const int BZ_MEM_ERROR = -3;
const int BZ_DATA_ERROR = -4;
const int BZ_DATA_ERROR_MAGIC = -5;
const int BZ_IO_ERROR = -6;
const int BZ_UNEXPECTED_EOF = -7;
const int BZ_OUTBUFF_FULL = -8;
const int BZ_CONFIG_ERROR = -9;
}
}
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