BinHexEncoding.cs source code in C# .NET

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Code:

/ WCF / WCF / 3.5.30729.1 / untmp / Orcas / SP / ndp / cdf / src / WCF / Serialization / System / Text / BinHexEncoding.cs / 1 / BinHexEncoding.cs

                            //------------------------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------------------------
namespace System.Text
{ 
    using System.Text;
    using System.Diagnostics; 
    using System.Runtime.Serialization; //For SR 
    using System.Globalization;
    using System.Security; 

    class BinHexEncoding : Encoding
    {
        static byte[] char2val = new byte[128] 
        {
                /*    0-15 */ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 
                /*   16-31 */ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 
                /*   32-47 */ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
                /*   48-63 */ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 
                /*   64-79 */ 0xFF, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
                /*   80-95 */ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
                /*  96-111 */ 0xFF, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
                /* 112-127 */ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 
        };
 
        static string val2char = "0123456789ABCDEF"; 

#if DEBUG 
        static BinHexEncoding()
        {
            for (char ch = '0'; ch <= '9'; ch++)
                DiagnosticUtility.DebugAssert(char2val[ch] == ch - '0', ""); 

            for (char ch = 'A'; ch <= 'F'; ch++) 
                DiagnosticUtility.DebugAssert(char2val[ch] == ch - 'A' + 10, ""); 

            for (char ch = 'a'; ch <= 'f'; ch++) 
                DiagnosticUtility.DebugAssert(char2val[ch] == ch - 'a' + 10, "");
        }
#endif
 
        public override int GetMaxByteCount(int charCount)
        { 
            if (charCount < 0) 
                throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException("charCount", SR.GetString(SR.ValueMustBeNonNegative)));
            if ((charCount % 2) != 0) 
                throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new FormatException(SR.GetString(SR.XmlInvalidBinHexLength, charCount.ToString(NumberFormatInfo.CurrentInfo))));
            return charCount / 2;
        }
 
        public override int GetByteCount(char[] chars, int index, int count)
        { 
            return GetMaxByteCount(count); 
        }
 
        /// 
        /// Critical - contains unsafe code
        /// Safe - unsafe code is effectively encapsulated, all inputs are validated
        ///  
        [SecurityCritical, SecurityTreatAsSafe]
        unsafe public override int GetBytes(char[] chars, int charIndex, int charCount, byte[] bytes, int byteIndex) 
        { 
            if (chars == null)
                throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentNullException("chars")); 
            if (charIndex < 0)
                throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException("charIndex", SR.GetString(SR.ValueMustBeNonNegative)));
            if (charIndex > chars.Length)
                throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException("charIndex", SR.GetString(SR.OffsetExceedsBufferSize, chars.Length))); 
            if (charCount < 0)
                throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException("charCount", SR.GetString(SR.ValueMustBeNonNegative))); 
            if (charCount > chars.Length - charIndex) 
                throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException("charCount", SR.GetString(SR.SizeExceedsRemainingBufferSpace, chars.Length - charIndex)));
            if (bytes == null) 
                throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentNullException("bytes"));
            if (byteIndex < 0)
                throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException("byteIndex", SR.GetString(SR.ValueMustBeNonNegative)));
            if (byteIndex > bytes.Length) 
                throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException("byteIndex", SR.GetString(SR.OffsetExceedsBufferSize, bytes.Length)));
            int byteCount = GetByteCount(chars, charIndex, charCount); 
            if (byteCount < 0 || byteCount > bytes.Length - byteIndex) 
                throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentException(SR.GetString(SR.XmlArrayTooSmall), "bytes"));
            if (charCount > 0) 
            {
                fixed (byte* _char2val = char2val)
                {
                    fixed (byte* _bytes = &bytes[byteIndex]) 
                    {
                        fixed (char* _chars = &chars[charIndex]) 
                        { 
                            char* pch = _chars;
                            char* pchMax = _chars + charCount; 
                            byte* pb = _bytes;
                            while (pch < pchMax)
                            {
                                DiagnosticUtility.DebugAssert(pch + 2 <= pchMax, ""); 
                                char pch0 = pch[0];
                                char pch1 = pch[1]; 
                                if ((pch0 | pch1) >= 128) 
                                    throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new FormatException(SR.GetString(SR.XmlInvalidBinHexSequence, new string(pch, 0, 2), charIndex + (int)(pch - _chars))));
                                byte d1 = _char2val[pch0]; 
                                byte d2 = _char2val[pch1];
                                if ((d1 | d2) == 0xFF)
                                    throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new FormatException(SR.GetString(SR.XmlInvalidBinHexSequence, new string(pch, 0, 2), charIndex + (int)(pch - _chars))));
                                pb[0] = (byte)((d1 << 4) + d2); 
                                pch += 2;
                                pb++; 
                            } 
                        }
                    } 
                }
            }
            return byteCount;
        } 
#if NO
        public override Encoder GetEncoder() 
        { 
            return new BufferedEncoder(this, 2);
        } 
#endif
        public override int GetMaxCharCount(int byteCount)
        {
            if (byteCount < 0 || byteCount > int.MaxValue / 2) 
                throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException("byteCount", SR.GetString(SR.ValueMustBeInRange, 0, int.MaxValue / 2)));
            return byteCount * 2; 
        } 

        public override int GetCharCount(byte[] bytes, int index, int count) 
        {
            return GetMaxCharCount(count);
        }
 
        /// 
        /// Critical - contains unsafe code 
        /// Safe - unsafe code is effectively encapsulated, all inputs are validated 
        /// 
        [SecurityCritical, SecurityTreatAsSafe] 
        unsafe public override int GetChars(byte[] bytes, int byteIndex, int byteCount, char[] chars, int charIndex)
        {
            if (bytes == null)
                throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentNullException("bytes")); 
            if (byteIndex < 0)
                throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException("byteIndex", SR.GetString(SR.ValueMustBeNonNegative))); 
            if (byteIndex > bytes.Length) 
                throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException("byteIndex", SR.GetString(SR.OffsetExceedsBufferSize, bytes.Length)));
            if (byteCount < 0) 
                throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException("byteCount", SR.GetString(SR.ValueMustBeNonNegative)));
            if (byteCount > bytes.Length - byteIndex)
                throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException("byteCount", SR.GetString(SR.SizeExceedsRemainingBufferSpace, bytes.Length - byteIndex)));
            int charCount = GetCharCount(bytes, byteIndex, byteCount); 
            if (chars == null)
                throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentNullException("chars")); 
            if (charIndex < 0) 
                throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException("charIndex", SR.GetString(SR.ValueMustBeNonNegative)));
            if (charIndex > chars.Length) 
                throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException("charIndex", SR.GetString(SR.OffsetExceedsBufferSize, chars.Length)));
            if (charCount < 0 || charCount > chars.Length - charIndex)
                throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentException(SR.GetString(SR.XmlArrayTooSmall), "chars"));
            if (byteCount > 0) 
            {
                fixed (char *_val2char = val2char) 
                { 
                    fixed (byte *_bytes = &bytes[byteIndex])
                    { 
                        fixed (char *_chars = &chars[charIndex])
                        {
                            char *pch = _chars;
                            byte *pb = _bytes; 
                            byte *pbMax = _bytes + byteCount;
                            while (pb < pbMax) 
                            { 
                                pch[0] = _val2char[pb[0] >> 4];
                                pch[1] = _val2char[pb[0] & 0x0F]; 
                                pb++;
                                pch += 2;
                            }
                        } 
                    }
                } 
            } 
            return charCount;
        } 
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
                        

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