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/*
* Copyright (c) 2002 Sergey Chaban <serge@wildwestsoftware.com>
*/
using System;
//using System.Runtime.InteropServices;
namespace Mono.PEToolkit.Metadata {
public sealed class MDUtils {
// Holds true if machine is little-endian.
private static bool isLE;
static MDUtils()
{
isLE = BitConverter.IsLittleEndian;
}
private MDUtils()
{
}
public static int CompressData(int data, out int res)
{
res = data;
int len = 4;
if (data < 0) {
// data is actually unsigned,
// that's why this empty clause is needed.
} else if (data < 0x80) {
res = data;
len = 1;
} else if (data < 0x4000) {
res = ((data >> 8) | 0x80) + ((data & 0xFF) << 8);
len = 2;
} else if (data < 0x1FFFFFFF) {
res = ((data >> 24) | 0xC0) |
(((data >> 16) & 0xFF) << 8) |
(((data >> 8) & 0xFF) << 16) |
((data & 0xFF) << 24);
len = 4;
}
return len;
}
unsafe public static int CompressData(void* pData, void* pRes)
{
byte* p = (byte*) pData;
int data = (isLE)
? *(int*)p
: p [0] + (p [1] << 8) + (p [2] << 16) + (p [3] << 24);
int res = 0;
int len = CompressData(data, out res);
p = (byte*) pRes;
if (isLE) {
*(int*)p = res;
} else {
*p++ = (byte) (res & 0xFF);
*p++ = (byte) (res >> 8);
*p++ = (byte) (res >> 16);
*p++ = (byte) (res >> 24);
}
return len;
}
public static int Max(params int [] list)
{
int len = (list != null) ? list.Length : 0;
if (len == 0) return 0;
int max = list [0];
for (int i = 1; i < len; i++) {
if (list [i] > max) max = list [i];
}
return max;
}
}
}
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