jellyfin/Emby.Common.Implementations/IO/SharpCifs/Util/Encdec.cs
2017-04-01 20:36:06 -04:00

402 lines
11 KiB
C#

// This code is derived from jcifs smb client library <jcifs at samba dot org>
// Ported by J. Arturo <webmaster at komodosoft dot net>
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
using System;
using System.IO;
using SharpCifs.Util.Sharpen;
namespace SharpCifs.Util
{
public class Encdec
{
public const long MillisecondsBetween1970And1601 = 11644473600000L;
public const long SecBetweeen1904And1970 = 2082844800L;
public const int Time1970Sec32Be = 1;
public const int Time1970Sec32Le = 2;
public const int Time1904Sec32Be = 3;
public const int Time1904Sec32Le = 4;
public const int Time1601Nanos64Le = 5;
public const int Time1601Nanos64Be = 6;
public const int Time1970Millis64Be = 7;
public const int Time1970Millis64Le = 8;
public static int Enc_uint16be(short s, byte[] dst, int di)
{
dst[di++] = unchecked((byte)((s >> 8) & unchecked(0xFF)));
dst[di] = unchecked((byte)(s & unchecked(0xFF)));
return 2;
}
public static int Enc_uint32be(int i, byte[] dst, int di)
{
dst[di++] = unchecked((byte)((i >> 24) & unchecked(0xFF)));
dst[di++] = unchecked((byte)((i >> 16) & unchecked(0xFF)));
dst[di++] = unchecked((byte)((i >> 8) & unchecked(0xFF)));
dst[di] = unchecked((byte)(i & unchecked(0xFF)));
return 4;
}
public static int Enc_uint16le(short s, byte[] dst, int di)
{
dst[di++] = unchecked((byte)(s & unchecked(0xFF)));
dst[di] = unchecked((byte)((s >> 8) & unchecked(0xFF)));
return 2;
}
public static int Enc_uint32le(int i, byte[] dst, int di)
{
dst[di++] = unchecked((byte)(i & unchecked(0xFF)));
dst[di++] = unchecked((byte)((i >> 8) & unchecked(0xFF)));
dst[di++] = unchecked((byte)((i >> 16) & unchecked(0xFF)));
dst[di] = unchecked((byte)((i >> 24) & unchecked(0xFF)));
return 4;
}
public static short Dec_uint16be(byte[] src, int si)
{
return (short)(((src[si] & unchecked(0xFF)) << 8) | (src[si + 1] & unchecked(
0xFF)));
}
public static int Dec_uint32be(byte[] src, int si)
{
return ((src[si] & unchecked(0xFF)) << 24) | ((src[si + 1] & unchecked(0xFF)) << 16) | ((src[si + 2] & unchecked(0xFF)) << 8) | (src[si + 3]
& unchecked(0xFF));
}
public static short Dec_uint16le(byte[] src, int si)
{
return (short)((src[si] & unchecked(0xFF)) | ((src[si + 1] & unchecked(0xFF)) << 8));
}
public static int Dec_uint32le(byte[] src, int si)
{
return (src[si] & unchecked(0xFF)) | ((src[si + 1] & unchecked(0xFF
)) << 8) | ((src[si + 2] & unchecked(0xFF)) << 16) | ((src[si + 3] & unchecked(
0xFF)) << 24);
}
public static int Enc_uint64be(long l, byte[] dst, int di)
{
Enc_uint32be((int)(l & unchecked(0xFFFFFFFFL)), dst, di + 4);
Enc_uint32be((int)((l >> 32) & unchecked(0xFFFFFFFFL)), dst, di);
return 8;
}
public static int Enc_uint64le(long l, byte[] dst, int di)
{
Enc_uint32le((int)(l & unchecked(0xFFFFFFFFL)), dst, di);
Enc_uint32le((int)((l >> 32) & unchecked(0xFFFFFFFFL)), dst, di + 4);
return 8;
}
public static long Dec_uint64be(byte[] src, int si)
{
long l;
l = Dec_uint32be(src, si) & unchecked(0xFFFFFFFFL);
l <<= 32;
l |= Dec_uint32be(src, si + 4) & unchecked(0xFFFFFFFFL);
return l;
}
public static long Dec_uint64le(byte[] src, int si)
{
long l;
l = Dec_uint32le(src, si + 4) & unchecked(0xFFFFFFFFL);
l <<= 32;
l |= Dec_uint32le(src, si) & unchecked(0xFFFFFFFFL);
return l;
}
public static int Enc_floatle(float f, byte[] dst, int di)
{
return Enc_uint32le((int)BitConverter.DoubleToInt64Bits(f), dst, di);
}
public static int Enc_floatbe(float f, byte[] dst, int di)
{
return Enc_uint32be((int)BitConverter.DoubleToInt64Bits(f), dst, di);
}
public static float Dec_floatle(byte[] src, int si)
{
return (float)BitConverter.Int64BitsToDouble(Dec_uint32le(src, si));
}
public static float Dec_floatbe(byte[] src, int si)
{
return (float)BitConverter.Int64BitsToDouble(Dec_uint32be(src, si));
}
public static int Enc_doublele(double d, byte[] dst, int di)
{
return Enc_uint64le(BitConverter.DoubleToInt64Bits(d), dst, di);
}
public static int Enc_doublebe(double d, byte[] dst, int di)
{
return Enc_uint64be(BitConverter.DoubleToInt64Bits(d), dst, di);
}
public static double Dec_doublele(byte[] src, int si)
{
return BitConverter.Int64BitsToDouble(Dec_uint64le(src, si));
}
public static double Dec_doublebe(byte[] src, int si)
{
return BitConverter.Int64BitsToDouble(Dec_uint64be(src, si));
}
public static int Enc_time(DateTime date, byte[] dst, int di, int enc)
{
long t;
switch (enc)
{
case Time1970Sec32Be:
{
return Enc_uint32be((int)(date.GetTime() / 1000L), dst, di);
}
case Time1970Sec32Le:
{
return Enc_uint32le((int)(date.GetTime() / 1000L), dst, di);
}
case Time1904Sec32Be:
{
return Enc_uint32be((int)((date.GetTime() / 1000L + SecBetweeen1904And1970) &
unchecked((int)(0xFFFFFFFF))), dst, di);
}
case Time1904Sec32Le:
{
return Enc_uint32le((int)((date.GetTime() / 1000L + SecBetweeen1904And1970) &
unchecked((int)(0xFFFFFFFF))), dst, di);
}
case Time1601Nanos64Be:
{
t = (date.GetTime() + MillisecondsBetween1970And1601) * 10000L;
return Enc_uint64be(t, dst, di);
}
case Time1601Nanos64Le:
{
t = (date.GetTime() + MillisecondsBetween1970And1601) * 10000L;
return Enc_uint64le(t, dst, di);
}
case Time1970Millis64Be:
{
return Enc_uint64be(date.GetTime(), dst, di);
}
case Time1970Millis64Le:
{
return Enc_uint64le(date.GetTime(), dst, di);
}
default:
{
throw new ArgumentException("Unsupported time encoding");
}
}
}
public static DateTime Dec_time(byte[] src, int si, int enc)
{
long t;
switch (enc)
{
case Time1970Sec32Be:
{
return Sharpen.Extensions.CreateDate(Dec_uint32be(src, si) * 1000L);
}
case Time1970Sec32Le:
{
return Sharpen.Extensions.CreateDate(Dec_uint32le(src, si) * 1000L);
}
case Time1904Sec32Be:
{
return Sharpen.Extensions.CreateDate(((Dec_uint32be(src, si) & unchecked(0xFFFFFFFFL)) - SecBetweeen1904And1970) * 1000L);
}
case Time1904Sec32Le:
{
return Sharpen.Extensions.CreateDate(((Dec_uint32le(src, si) & unchecked(0xFFFFFFFFL)) - SecBetweeen1904And1970) * 1000L);
}
case Time1601Nanos64Be:
{
t = Dec_uint64be(src, si);
return Sharpen.Extensions.CreateDate(t / 10000L - MillisecondsBetween1970And1601
);
}
case Time1601Nanos64Le:
{
t = Dec_uint64le(src, si);
return Sharpen.Extensions.CreateDate(t / 10000L - MillisecondsBetween1970And1601
);
}
case Time1970Millis64Be:
{
return Sharpen.Extensions.CreateDate(Dec_uint64be(src, si));
}
case Time1970Millis64Le:
{
return Sharpen.Extensions.CreateDate(Dec_uint64le(src, si));
}
default:
{
throw new ArgumentException("Unsupported time encoding");
}
}
}
/// <exception cref="System.IO.IOException"></exception>
public static int Enc_utf8(string str, byte[] dst, int di, int dlim)
{
int start = di;
int ch;
int strlen = str.Length;
for (int i = 0; di < dlim && i < strlen; i++)
{
ch = str[i];
if ((ch >= unchecked(0x0001)) && (ch <= unchecked(0x007F)))
{
dst[di++] = unchecked((byte)ch);
}
else
{
if (ch > unchecked(0x07FF))
{
if ((dlim - di) < 3)
{
break;
}
dst[di++] = unchecked((byte)(unchecked(0xE0) | ((ch >> 12) & unchecked(0x0F))));
dst[di++] = unchecked((byte)(unchecked(0x80) | ((ch >> 6) & unchecked(0x3F))));
dst[di++] = unchecked((byte)(unchecked(0x80) | ((ch >> 0) & unchecked(0x3F))));
}
else
{
if ((dlim - di) < 2)
{
break;
}
dst[di++] = unchecked((byte)(unchecked(0xC0) | ((ch >> 6) & unchecked(0x1F))));
dst[di++] = unchecked((byte)(unchecked(0x80) | ((ch >> 0) & unchecked(0x3F))));
}
}
}
return di - start;
}
/// <exception cref="System.IO.IOException"></exception>
public static string Dec_utf8(byte[] src, int si, int slim)
{
char[] uni = new char[slim - si];
int ui;
int ch;
for (ui = 0; si < slim && (ch = src[si++] & unchecked(0xFF)) != 0; ui++)
{
if (ch < unchecked(0x80))
{
uni[ui] = (char)ch;
}
else
{
if ((ch & unchecked(0xE0)) == unchecked(0xC0))
{
if ((slim - si) < 2)
{
break;
}
uni[ui] = (char)((ch & unchecked(0x1F)) << 6);
ch = src[si++] & unchecked(0xFF);
uni[ui] |= (char)((char)ch & unchecked(0x3F));
if ((ch & unchecked(0xC0)) != unchecked(0x80) || uni[ui] < unchecked(
0x80))
{
throw new IOException("Invalid UTF-8 sequence");
}
}
else
{
if ((ch & unchecked(0xF0)) == unchecked(0xE0))
{
if ((slim - si) < 3)
{
break;
}
uni[ui] = (char)((ch & unchecked(0x0F)) << 12);
ch = src[si++] & unchecked(0xFF);
if ((ch & unchecked(0xC0)) != unchecked(0x80))
{
throw new IOException("Invalid UTF-8 sequence");
}
uni[ui] |= (char)((char)(ch & unchecked(0x3F)) << 6);
ch = src[si++] & unchecked(0xFF);
uni[ui] |= (char)((char)ch & unchecked(0x3F));
if ((ch & unchecked(0xC0)) != unchecked(0x80) || uni[ui] < unchecked(
0x800))
{
throw new IOException("Invalid UTF-8 sequence");
}
}
else
{
throw new IOException("Unsupported UTF-8 sequence");
}
}
}
}
return new string(uni, 0, ui);
}
/// <exception cref="System.IO.IOException"></exception>
public static string Dec_ucs2le(byte[] src, int si, int slim, char[] buf)
{
int bi;
for (bi = 0; (si + 1) < slim; bi++, si += 2)
{
buf[bi] = (char)Dec_uint16le(src, si);
if (buf[bi] == '\0')
{
break;
}
}
return new string(buf, 0, bi);
}
}
}