Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Security / Util / Hex.cs / 1 / Hex.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== /* * Hex.cs * * Operations to convert to and from Hex * */ namespace System.Security.Util { using System; using System.Security; internal static class Hex { // converts number to hex digit. Does not do any range checks. static char HexDigit(int num) { return (char)((num < 10) ? (num + '0') : (num + ('A' - 10))); } public static String EncodeHexString(byte[] sArray) { String result = null; if(sArray != null) { char[] hexOrder = new char[sArray.Length * 2]; int digit; for(int i = 0, j = 0; i < sArray.Length; i++) { digit = (int)((sArray[i] & 0xf0) >> 4); hexOrder[j++] = HexDigit(digit); digit = (int)(sArray[i] & 0x0f); hexOrder[j++] = HexDigit(digit); } result = new String(hexOrder); } return result; } internal static string EncodeHexStringFromInt(byte[] sArray) { String result = null; if(sArray != null) { char[] hexOrder = new char[sArray.Length * 2]; int i = sArray.Length; int digit, j=0; while (i-- > 0) { digit = (sArray[i] & 0xf0) >> 4; hexOrder[j++] = HexDigit(digit); digit = sArray[i] & 0x0f; hexOrder[j++] = HexDigit(digit); } result = new String(hexOrder); } return result; } public static int ConvertHexDigit(Char val) { if (val <= '9' && val >= '0') return (val - '0'); else if (val >= 'a' && val <= 'f') return ((val - 'a') + 10); else if (val >= 'A' && val <= 'F') return ((val - 'A') + 10); else throw new ArgumentException( Environment.GetResourceString( "ArgumentOutOfRange_Index" ) ); } public static byte[] DecodeHexString(String hexString) { if (hexString == null) throw new ArgumentNullException( "hexString" ); bool spaceSkippingMode = false; int i = 0; int length = hexString.Length; if ((length >= 2) && (hexString[0] == '0') && ( (hexString[1] == 'x') || (hexString[1] == 'X') )) { length = hexString.Length - 2; i = 2; } // Hex strings must always have 2N or (3N - 1) entries. if (length % 2 != 0 && length % 3 != 2) { throw new ArgumentException( Environment.GetResourceString( "Argument_InvalidHexFormat" ) ); } byte[] sArray; if (length >=3 && hexString[i + 2] == ' ') { spaceSkippingMode = true; // Each hex digit will take three spaces, except the first (hence the plus 1). sArray = new byte[length / 3 + 1]; } else { // Each hex digit will take two spaces sArray = new byte[length / 2]; } int digit; int rawdigit; for (int j = 0; i < hexString.Length; i += 2, j++) { rawdigit = ConvertHexDigit(hexString[i]); digit = ConvertHexDigit(hexString[i+1]); sArray[j] = (byte) (digit | (rawdigit << 4)); if (spaceSkippingMode) i++; } return(sArray); } } }
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