//
// System.BitConverter.cs
//
// Author:
// Matt Kimball (matt@kimball.net)
//
//
// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System.Text;
namespace System{
public
static
class BitConverter
{
static readonly bool SwappedWordsInDouble = DoubleWordsAreSwapped ();
public static readonly bool IsLittleEndian = AmILittleEndian ();
static unsafe bool AmILittleEndian ()
{
// binary representations of 1.0:
// big endian: 3f f0 00 00 00 00 00 00
// little endian: 00 00 00 00 00 00 f0 3f
// arm fpa little endian: 00 00 f0 3f 00 00 00 00
double d = 1.0;
byte *b = (byte*)&d;
return (b [0] == 0);
}
static unsafe bool DoubleWordsAreSwapped ()
{
// binary representations of 1.0:
// big endian: 3f f0 00 00 00 00 00 00
// little endian: 00 00 00 00 00 00 f0 3f
// arm fpa little endian: 00 00 f0 3f 00 00 00 00
double d = 1.0;
byte *b = (byte*)&d;
return b [2] == 0xf0;
}
public static long DoubleToInt64Bits (double value)
{
return ToInt64 (GetBytes (value), 0);
}
public static double Int64BitsToDouble (long value)
{
return ToDouble (GetBytes (value), 0);
}
internal static double InternalInt64BitsToDouble (long value)
{
return SwappableToDouble (GetBytes (value), 0);
}
unsafe static byte[] GetBytes (byte *ptr, int count)
{
byte [] ret = new byte [count];
for (int i = 0; i < count; i++) {
ret [i] = ptr [i];
}
return ret;
}
unsafe public static byte[] GetBytes (bool value)
{
return GetBytes ((byte *) &value, 1);
}
unsafe public static byte[] GetBytes (char value)
{
return GetBytes ((byte *) &value, 2);
}
unsafe public static byte[] GetBytes (short value)
{
return GetBytes ((byte *) &value, 2);
}
unsafe public static byte[] GetBytes (int value)
{
return GetBytes ((byte *) &value, 4);
}
unsafe public static byte[] GetBytes (long value)
{
return GetBytes ((byte *) &value, 8);
}
[CLSCompliant (false)]
unsafe public static byte[] GetBytes (ushort value)
{
return GetBytes ((byte *) &value, 2);
}
[CLSCompliant (false)]
unsafe public static byte[] GetBytes (uint value)
{
return GetBytes ((byte *) &value, 4);
}
[CLSCompliant (false)]
unsafe public static byte[] GetBytes (ulong value)
{
return GetBytes ((byte *) &value, 8);
}
unsafe public static byte[] GetBytes (float value)
{
return GetBytes ((byte *) &value, 4);
}
unsafe public static byte[] GetBytes (double value)
{
if (SwappedWordsInDouble) {
byte[] data = new byte [8];
byte *p = (byte*)&value;
data [0] = p [4];
data [1] = p [5];
data [2] = p [6];
data [3] = p [7];
data [4] = p [0];
data [5] = p [1];
data [6] = p [2];
data [7] = p [3];
return data;
} else {
return GetBytes ((byte *) &value, 8);
}
}
unsafe static void PutBytes (byte *dst, byte[] src, int start_index, int count)
{
if (src == null)
throw new ArgumentNullException ("value");
if (start_index < 0 || (start_index > src.Length - 1))
throw new ArgumentOutOfRangeException ("startIndex", "Index was"
+ " out of range. Must be non-negative and less than the"
+ " size of the collection.");
// avoid integer overflow (with large pos/neg start_index values)
if (src.Length - count < start_index)
throw new ArgumentException ("Destination array is not long"
+ " enough to copy all the items in the collection."
+ " Check array index and length.");
for (int i = 0; i < count; i++)
dst[i] = src[i + start_index];
}
unsafe public static bool ToBoolean (byte[] value, int startIndex)
{
if (value == null)
throw new ArgumentNullException ("value");
if (startIndex < 0 || (startIndex > value.Length - 1))
throw new ArgumentOutOfRangeException ("startIndex", "Index was"
+ " out of range. Must be non-negative and less than the"
+ " size of the collection.");
if (value [startIndex] != 0)
return true;
return false;
}
unsafe public static char ToChar (byte[] value, int startIndex)
{
char ret;
PutBytes ((byte *) &ret, value, startIndex, 2);
return ret;
}
unsafe public static short ToInt16 (byte[] value, int startIndex)
{
short ret;
PutBytes ((byte *) &ret, value, startIndex, 2);
return ret;
}
unsafe public static int ToInt32 (byte[] value, int startIndex)
{
int ret;
PutBytes ((byte *) &ret, value, startIndex, 4);
return ret;
}
unsafe public static long ToInt64 (byte[] value, int startIndex)
{
long ret;
PutBytes ((byte *) &ret, value, startIndex, 8);
return ret;
}
[CLSCompliant (false)]
unsafe public static ushort ToUInt16 (byte[] value, int startIndex)
{
ushort ret;
PutBytes ((byte *) &ret, value, startIndex, 2);
return ret;
}
[CLSCompliant (false)]
unsafe public static uint ToUInt32 (byte[] value, int startIndex)
{
uint ret;
PutBytes ((byte *) &ret, value, startIndex, 4);
return ret;
}
[CLSCompliant (false)]
unsafe public static ulong ToUInt64 (byte[] value, int startIndex)
{
ulong ret;
PutBytes ((byte *) &ret, value, startIndex, 8);
return ret;
}
unsafe public static float ToSingle (byte[] value, int startIndex)
{
float ret;
PutBytes ((byte *) &ret, value, startIndex, 4);
return ret;
}
unsafe public static double ToDouble (byte[] value, int startIndex)
{
double ret;
if (SwappedWordsInDouble) {
byte* p = (byte*)&ret;
if (value == null)
throw new ArgumentNullException ("value");
if (startIndex < 0 || (startIndex > value.Length - 1))
throw new ArgumentOutOfRangeException ("startIndex", "Index was"
+ " out of range. Must be non-negative and less than the"
+ " size of the collection.");
// avoid integer overflow (with large pos/neg start_index values)
if (value.Length - 8 < startIndex)
throw new ArgumentException ("Destination array is not long"
+ " enough to copy all the items in the collection."
+ " Check array index and length.");
p [0] = value [startIndex + 4];
p [1] = value [startIndex + 5];
p [2] = value [startIndex + 6];
p [3] = value [startIndex + 7];
p [4] = value [startIndex + 0];
p [5] = value [startIndex + 1];
p [6] = value [startIndex + 2];
p [7] = value [startIndex + 3];
return ret;
}
PutBytes ((byte *) &ret, value, startIndex, 8);
return ret;
}
unsafe internal static double SwappableToDouble (byte[] value, int startIndex)
{
double ret;
if (SwappedWordsInDouble) {
byte* p = (byte*)&ret;
if (value == null)
throw new ArgumentNullException ("value");
if (startIndex < 0 || (startIndex > value.Length - 1))
throw new ArgumentOutOfRangeException ("startIndex", "Index was"
+ " out of range. Must be non-negative and less than the"
+ " size of the collection.");
// avoid integer overflow (with large pos/neg start_index values)
if (value.Length - 8 < startIndex)
throw new ArgumentException ("Destination array is not long"
+ " enough to copy all the items in the collection."
+ " Check array index and length.");
p [0] = value [startIndex + 4];
p [1] = value [startIndex + 5];
p [2] = value [startIndex + 6];
p [3] = value [startIndex + 7];
p [4] = value [startIndex + 0];
p [5] = value [startIndex + 1];
p [6] = value [startIndex + 2];
p [7] = value [startIndex + 3];
return ret;
} else if (!IsLittleEndian) {
byte* p = (byte*)&ret;
if (value == null)
throw new ArgumentNullException ("value");
if (startIndex < 0 || (startIndex > value.Length - 1))
throw new ArgumentOutOfRangeException ("startIndex", "Index was"
+ " out of range. Must be non-negative and less than the"
+ " size of the collection.");
// avoid integer overflow (with large pos/neg start_index values)
if (value.Length - 8 < startIndex)
throw new ArgumentException ("Destination array is not long"
+ " enough to copy all the items in the collection."
+ " Check array index and length.");
p [0] = value [startIndex + 7];
p [1] = value [startIndex + 6];
p [2] = value [startIndex + 5];
p [3] = value [startIndex + 4];
p [4] = value [startIndex + 3];
p [5] = value [startIndex + 2];
p [6] = value [startIndex + 1];
p [7] = value [startIndex + 0];
return ret;
}
PutBytes ((byte *) &ret, value, startIndex, 8);
return ret;
}
public static string ToString (byte[] value)
{
if (value == null)
throw new ArgumentNullException ("value");
return ToString (value, 0, value.Length);
}
public static string ToString (byte[] value, int startIndex)
{
if (value == null)
throw new ArgumentNullException ("value");
return ToString (value, startIndex, value.Length - startIndex);
}
public static string ToString (byte[] value, int startIndex, int length)
{
if (value == null)
throw new ArgumentNullException ("byteArray");
// The 4th and last clause (start_index >= value.Length)
// was added as a small fix to a very obscure bug.
// It makes a small difference when start_index is
// outside the range and length==0.
if (startIndex < 0 || startIndex >= value.Length) {
// special (but valid) case (e.g. new byte [0])
if ((startIndex == 0) && (value.Length == 0))
return String.Empty;
throw new ArgumentOutOfRangeException ("startIndex", "Index was"
+ " out of range. Must be non-negative and less than the"
+ " size of the collection.");
}
if (length < 0)
throw new ArgumentOutOfRangeException ("length",
"Value must be positive.");
// note: re-ordered to avoid possible integer overflow
if (startIndex > value.Length - length)
throw new ArgumentException ("startIndex + length > value.Length");
if (length == 0)
return string.Empty;
StringBuilder builder = new StringBuilder(length * 3 - 1);
int end = startIndex + length;
for (int i = startIndex; i < end; i++) {
if (i > startIndex)
builder.Append('-');
char high = (char)((value[i] >> 4) & 0x0f);
char low = (char)(value[i] & 0x0f);
if (high < 10)
high += '0';
else {
high -= (char) 10;
high += 'A';
}
if (low < 10)
low += '0';
else {
low -= (char) 10;
low += 'A';
}
builder.Append(high);
builder.Append(low);
}
return builder.ToString ();
}
}
}
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