Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / BitConverter.cs / 1 / BitConverter.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== /*============================================================ ** ** Class: BitConverter ** ** ** Purpose: Allows developers to view the base data types as ** an arbitrary array of bits. ** ** ===========================================================*/ namespace System { using System; using System.Runtime.CompilerServices; // The BitConverter class contains methods for // converting an array of bytes to one of the base data // types, as well as for converting a base data type to an // array of bytes. // // Only statics, does not need to be marked with the serializable attribute public static class BitConverter { // This field indicates the "endianess" of the architecture. // The value is set to true if the architecture is // little endian; false if it is big endian. #if BIGENDIAN public static readonly bool IsLittleEndian /* = false */; #else public static readonly bool IsLittleEndian = true; #endif // Converts a byte into an array of bytes with length one. public static byte[] GetBytes(bool value) { byte[] r = new byte[1]; r[0] = (value ? (byte)Boolean.True : (byte)Boolean.False ); return r; } // Converts a char into an array of bytes with length two. public static byte[] GetBytes(char value) { return GetBytes((short)value); } // Converts a short into an array of bytes with length // two. public unsafe static byte[] GetBytes(short value) { byte[] bytes = new byte[2]; fixed(byte* b = bytes) *((short*)b) = value; return bytes; } // Converts an int into an array of bytes with length // four. public unsafe static byte[] GetBytes(int value) { byte[] bytes = new byte[4]; fixed(byte* b = bytes) *((int*)b) = value; return bytes; } // Converts a long into an array of bytes with length // eight. public unsafe static byte[] GetBytes(long value) { byte[] bytes = new byte[8]; fixed(byte* b = bytes) *((long*)b) = value; return bytes; } // Converts an ushort into an array of bytes with // length two. [CLSCompliant(false)] public static byte[] GetBytes(ushort value) { return GetBytes((short)value); } // Converts an uint into an array of bytes with // length four. [CLSCompliant(false)] public static byte[] GetBytes(uint value) { return GetBytes((int)value); } // Converts an unsigned long into an array of bytes with // length eight. [CLSCompliant(false)] public static byte[] GetBytes(ulong value) { return GetBytes((long)value); } // Converts a float into an array of bytes with length // four. public unsafe static byte[] GetBytes(float value) { return GetBytes(*(int*)&value); } // Converts a double into an array of bytes with length // eight. public unsafe static byte[] GetBytes(double value) { return GetBytes(*(long*)&value); } // Converts an array of bytes into a char. public static char ToChar(byte[] value, int startIndex) { return (char)ToInt16(value, startIndex); } // Converts an array of bytes into a short. public static unsafe short ToInt16(byte[] value, int startIndex) { if( value == null) { ThrowHelper.ThrowArgumentNullException(ExceptionArgument.value); } if ((uint) startIndex >= value.Length) { ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.startIndex, ExceptionResource.ArgumentOutOfRange_Index); } if (startIndex > value.Length -2) { ThrowHelper.ThrowArgumentException(ExceptionResource.Arg_ArrayPlusOffTooSmall); } fixed( byte * pbyte = &value[startIndex]) { if( startIndex % 2 == 0) { // data is aligned return *((short *) pbyte); } else { if( IsLittleEndian) { return (short)((*pbyte) | (*(pbyte + 1) << 8)) ; } else { return (short)((*pbyte << 8) | (*(pbyte + 1))); } } } } // Converts an array of bytes into an int. public static unsafe int ToInt32 (byte[]value, int startIndex) { if( value == null) { ThrowHelper.ThrowArgumentNullException(ExceptionArgument.value); } if ((uint) startIndex >= value.Length) { ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.startIndex, ExceptionResource.ArgumentOutOfRange_Index); } if (startIndex > value.Length -4) { ThrowHelper.ThrowArgumentException(ExceptionResource.Arg_ArrayPlusOffTooSmall); } fixed( byte * pbyte = &value[startIndex]) { if( startIndex % 4 == 0) { // data is aligned return *((int *) pbyte); } else { if( IsLittleEndian) { return (*pbyte) | (*(pbyte + 1) << 8) | (*(pbyte + 2) << 16) | (*(pbyte + 3) << 24); } else { return (*pbyte << 24) | (*(pbyte + 1) << 16) | (*(pbyte + 2) << 8) | (*(pbyte + 3)); } } } } // Converts an array of bytes into a long. public static unsafe long ToInt64 (byte[] value, int startIndex) { if( value == null) { ThrowHelper.ThrowArgumentNullException(ExceptionArgument.value); } if ((uint) startIndex >= value.Length) { ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.startIndex, ExceptionResource.ArgumentOutOfRange_Index); } if (startIndex > value.Length -8) { ThrowHelper.ThrowArgumentException(ExceptionResource.Arg_ArrayPlusOffTooSmall); } fixed( byte * pbyte = &value[startIndex]) { if( startIndex % 8 == 0) { // data is aligned return *((long *) pbyte); } else { if( IsLittleEndian) { int i1 = (*pbyte) | (*(pbyte + 1) << 8) | (*(pbyte + 2) << 16) | (*(pbyte + 3) << 24); int i2 = (*(pbyte+4)) | (*(pbyte + 5) << 8) | (*(pbyte + 6) << 16) | (*(pbyte + 7) << 24); return (uint)i1 | ((long)i2 << 32); } else { int i1 = (*pbyte << 24) | (*(pbyte + 1) << 16) | (*(pbyte + 2) << 8) | (*(pbyte + 3)); int i2 = (*(pbyte+4) << 24) | (*(pbyte + 5) << 16) | (*(pbyte + 6) << 8) | (*(pbyte + 7)); return (uint)i2 | ((long)i1 << 32); } } } } // Converts an array of bytes into an ushort. // [CLSCompliant(false)] public static ushort ToUInt16(byte[] value, int startIndex) { return (ushort)ToInt16(value, startIndex); } // Converts an array of bytes into an uint. // [CLSCompliant(false)] public static uint ToUInt32(byte[] value, int startIndex) { return (uint)ToInt32(value, startIndex); } // Converts an array of bytes into an unsigned long. // [CLSCompliant(false)] public static ulong ToUInt64(byte[] value, int startIndex) { return (ulong)ToInt64(value, startIndex); } // Converts an array of bytes into a float. unsafe public static float ToSingle (byte[]value, int startIndex) { int val = ToInt32(value, startIndex); return *(float*)&val; } // Converts an array of bytes into a double. unsafe public static double ToDouble (byte []value, int startIndex) { long val = ToInt64(value, startIndex); return *(double*)&val; } private static char GetHexValue(int i) { BCLDebug.Assert( i >=0 && i <16, "i is out of range."); if (i<10) { return (char)(i + '0'); } return (char)(i - 10 + 'A'); } // Converts an array of bytes into a String. public static String ToString (byte[] value, int startIndex, int length) { if (value == null) { throw new ArgumentNullException("byteArray"); } int arrayLen = value.Length; if (startIndex < 0 || (startIndex >= arrayLen && startIndex > 0)) { throw new ArgumentOutOfRangeException("startIndex", Environment.GetResourceString("ArgumentOutOfRange_StartIndex")); } int realLength = length; if (realLength<0) { throw new ArgumentOutOfRangeException("length", Environment.GetResourceString("ArgumentOutOfRange_GenericPositive")); } if (startIndex > arrayLen - realLength) { throw new ArgumentException(Environment.GetResourceString("Arg_ArrayPlusOffTooSmall")); } if (realLength == 0) { return string.Empty; } char[] chArray = new char[realLength*3]; int i = 0; int index = startIndex; for (i = 0; i < realLength*3; i += 3) { byte b = value[index++]; chArray[i]= GetHexValue(b/16); chArray[i+1] = GetHexValue(b%16); chArray[i+2] = '-'; } // We don't need the last '-' character return new String(chArray, 0, chArray.Length - 1); } // Converts an array of bytes into a String. public static String ToString(byte [] value) { if (value == null) throw new ArgumentNullException("value"); return ToString(value, 0, value.Length); } // Converts an array of bytes into a String. public static String ToString (byte [] value, int startIndex) { if (value == null) throw new ArgumentNullException("value"); return ToString(value, startIndex, value.Length - startIndex); } /*==================================ToBoolean=================================== **Action: Convert an array of bytes to a boolean value. We treat this array ** as if the first 4 bytes were an Int4 an operate on this value. **Returns: True if the Int4 value of the first 4 bytes is non-zero. **Arguments: value -- The byte array ** startIndex -- The position within the array. **Exceptions: See ToInt4. ==============================================================================*/ // Converts an array of bytes into a boolean. public static bool ToBoolean(byte[]value, int startIndex) { if (value==null) throw new ArgumentNullException("value"); if (startIndex < 0) throw new ArgumentOutOfRangeException("startIndex", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum")); if (startIndex > value.Length - 1) throw new ArgumentOutOfRangeException("startIndex", Environment.GetResourceString("ArgumentOutOfRange_Index")); return (value[startIndex]==0)?false:true; } public static unsafe long DoubleToInt64Bits(double value) { return *((long *)&value); } public static unsafe double Int64BitsToDouble(long value) { return *((double *)&value); } } }
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