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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,153 +1,153 @@ | ||
| using System.Collections.Generic; | ||
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| using System.Collections.Generic; | ||
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| namespace System.Net | ||
| { | ||
| using System; | ||
| using System.Numerics; | ||
| using System.Text; | ||
|
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| /// <summary> | ||
| /// Extension methods to convert <see cref="System.Numerics.BigInteger"/> | ||
| /// instances to hexadecimal, octal, and binary strings. | ||
| /// </summary> | ||
| public static class BigIntegerExtensions { | ||
| /// <summary> | ||
| /// Converts a <see cref="BigInteger"/> to a binary string. | ||
| /// </summary> | ||
| /// <param name="bigint">A <see cref="BigInteger"/>.</param> | ||
| /// <returns> | ||
| /// A <see cref="System.String"/> containing a binary | ||
| /// representation of the supplied <see cref="BigInteger"/>. | ||
| /// </returns> | ||
| public static string ToBinaryString(this BigInteger bigint) { | ||
| var bytes = bigint.ToByteArray(); | ||
| var idx = bytes.Length - 1; | ||
|
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| // Create a StringBuilder having appropriate capacity. | ||
| var base2 = new StringBuilder(bytes.Length * 8); | ||
|
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||
| // Convert first byte to binary. | ||
| var binary = Convert.ToString(bytes[idx], 2); | ||
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| // Ensure leading zero exists if value is positive. | ||
| if (binary[0] != '0' && bigint.Sign == 1) { | ||
| base2.Append('0'); | ||
| } | ||
|
|
||
| // Append binary string to StringBuilder. | ||
| base2.Append(binary); | ||
|
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| // Convert remaining bytes adding leading zeros. | ||
| for (idx--; idx >= 0; idx--) { | ||
| base2.Append(Convert.ToString(bytes[idx], 2).PadLeft(8, '0')); | ||
| } | ||
|
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| return base2.ToString(); | ||
| } | ||
|
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| /// <summary> | ||
| /// Converts a <see cref="BigInteger"/> to a hexadecimal string. | ||
| /// </summary> | ||
| /// <param name="bigint">A <see cref="BigInteger"/>.</param> | ||
| /// <returns> | ||
| /// A <see cref="System.String"/> containing a hexadecimal | ||
| /// representation of the supplied <see cref="BigInteger"/>. | ||
| /// </returns> | ||
| public static string ToHexadecimalString(this BigInteger bigint) { | ||
| return bigint.ToString("X"); | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Converts a <see cref="BigInteger"/> to a octal string. | ||
| /// </summary> | ||
| /// <param name="bigint">A <see cref="BigInteger"/>.</param> | ||
| /// <returns> | ||
| /// A <see cref="System.String"/> containing an octal | ||
| /// representation of the supplied <see cref="BigInteger"/>. | ||
| /// </returns> | ||
| public static string ToOctalString(this BigInteger bigint) { | ||
| var bytes = bigint.ToByteArray(); | ||
| var idx = bytes.Length - 1; | ||
|
|
||
| // Create a StringBuilder having appropriate capacity. | ||
| var base8 = new StringBuilder(((bytes.Length / 3) + 1) * 8); | ||
|
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| // Calculate how many bytes are extra when byte array is split | ||
| // into three-byte (24-bit) chunks. | ||
| var extra = bytes.Length % 3; | ||
|
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| // If no bytes are extra, use three bytes for first chunk. | ||
| if (extra == 0) { | ||
| extra = 3; | ||
| } | ||
|
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| // Convert first chunk (24-bits) to integer value. | ||
| int int24 = 0; | ||
| for (; extra != 0; extra--) { | ||
| int24 <<= 8; | ||
| int24 += bytes[idx--]; | ||
| } | ||
|
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| // Convert 24-bit integer to octal without adding leading zeros. | ||
| var octal = Convert.ToString(int24, 8); | ||
|
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| // Ensure leading zero exists if value is positive. | ||
| if (octal[0] != '0' && bigint.Sign == 1) { | ||
| base8.Append('0'); | ||
| } | ||
|
|
||
| // Append first converted chunk to StringBuilder. | ||
| base8.Append(octal); | ||
|
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||
| // Convert remaining 24-bit chunks, adding leading zeros. | ||
| for (; idx >= 0; idx -= 3) { | ||
| int24 = (bytes[idx] << 16) + (bytes[idx - 1] << 8) + bytes[idx - 2]; | ||
| base8.Append(Convert.ToString(int24, 8).PadLeft(8, '0')); | ||
| } | ||
|
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||
| return base8.ToString(); | ||
| } | ||
|
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||
| /// <summary> | ||
| /// | ||
| /// Reverse a Positive BigInteger ONLY | ||
| /// Bitwise ~ operator | ||
| /// | ||
| /// Input : FF FF FF FF | ||
| /// Width : 4 | ||
| /// Result : 00 00 00 00 | ||
| /// | ||
| /// | ||
| /// Input : 00 00 00 00 | ||
| /// Width : 4 | ||
| /// Result : FF FF FF FF | ||
| /// | ||
| /// Input : FF FF FF FF | ||
| /// Width : 8 | ||
| /// Result : FF FF FF FF 00 00 00 00 | ||
| /// | ||
| /// | ||
| /// Input : 00 00 00 00 | ||
| /// Width : 8 | ||
| /// Result : FF FF FF FF FF FF FF FF | ||
| /// | ||
| /// </summary> | ||
| /// <param name="input"></param> | ||
| /// <param name="width"></param> | ||
| /// <returns></returns> | ||
| public static BigInteger PositiveReverse(this BigInteger input, int width) { | ||
|
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| var result = new List<byte>(); | ||
| var bytes = input.ToByteArray(); | ||
| var work = new byte[width]; | ||
| Array.Copy(bytes, 0, work, 0, bytes.Length - 1); // Length -1 : positive BigInteger | ||
|
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||
| for (int i = 0; i < work.Length; i++) { | ||
| result.Add((byte)(~work[i])); | ||
| } | ||
| result.Add(0); // positive BigInteger | ||
| return new BigInteger(result.ToArray()); | ||
|
|
||
| } | ||
| } | ||
| } | ||
| { | ||
| using System; | ||
| using System.Numerics; | ||
| using System.Text; | ||
|
|
||
| /// <summary> | ||
| /// Extension methods to convert <see cref="System.Numerics.BigInteger"/> | ||
| /// instances to hexadecimal, octal, and binary strings. | ||
| /// </summary> | ||
| public static class BigIntegerExtensions { | ||
| /// <summary> | ||
| /// Converts a <see cref="BigInteger"/> to a binary string. | ||
| /// </summary> | ||
| /// <param name="bigint">A <see cref="BigInteger"/>.</param> | ||
| /// <returns> | ||
| /// A <see cref="System.String"/> containing a binary | ||
| /// representation of the supplied <see cref="BigInteger"/>. | ||
| /// </returns> | ||
| public static string ToBinaryString(this BigInteger bigint) { | ||
| var bytes = bigint.ToByteArray(); | ||
| var idx = bytes.Length - 1; | ||
|
|
||
| // Create a StringBuilder having appropriate capacity. | ||
| var base2 = new StringBuilder(bytes.Length * 8); | ||
|
|
||
| // Convert first byte to binary. | ||
| var binary = Convert.ToString(bytes[idx], 2); | ||
|
|
||
| // Ensure leading zero exists if value is positive. | ||
| if (binary[0] != '0' && bigint.Sign == 1) { | ||
| base2.Append('0'); | ||
| } | ||
|
|
||
| // Append binary string to StringBuilder. | ||
| base2.Append(binary); | ||
|
|
||
| // Convert remaining bytes adding leading zeros. | ||
| for (idx--; idx >= 0; idx--) { | ||
| base2.Append(Convert.ToString(bytes[idx], 2).PadLeft(8, '0')); | ||
| } | ||
|
|
||
| return base2.ToString(); | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Converts a <see cref="BigInteger"/> to a hexadecimal string. | ||
| /// </summary> | ||
| /// <param name="bigint">A <see cref="BigInteger"/>.</param> | ||
| /// <returns> | ||
| /// A <see cref="System.String"/> containing a hexadecimal | ||
| /// representation of the supplied <see cref="BigInteger"/>. | ||
| /// </returns> | ||
| public static string ToHexadecimalString(this BigInteger bigint) { | ||
| return bigint.ToString("X"); | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Converts a <see cref="BigInteger"/> to a octal string. | ||
| /// </summary> | ||
| /// <param name="bigint">A <see cref="BigInteger"/>.</param> | ||
| /// <returns> | ||
| /// A <see cref="System.String"/> containing an octal | ||
| /// representation of the supplied <see cref="BigInteger"/>. | ||
| /// </returns> | ||
| public static string ToOctalString(this BigInteger bigint) { | ||
| var bytes = bigint.ToByteArray(); | ||
| var idx = bytes.Length - 1; | ||
|
|
||
| // Create a StringBuilder having appropriate capacity. | ||
| var base8 = new StringBuilder(((bytes.Length / 3) + 1) * 8); | ||
|
|
||
| // Calculate how many bytes are extra when byte array is split | ||
| // into three-byte (24-bit) chunks. | ||
| var extra = bytes.Length % 3; | ||
|
|
||
| // If no bytes are extra, use three bytes for first chunk. | ||
| if (extra == 0) { | ||
| extra = 3; | ||
| } | ||
|
|
||
| // Convert first chunk (24-bits) to integer value. | ||
| int int24 = 0; | ||
| for (; extra != 0; extra--) { | ||
| int24 <<= 8; | ||
| int24 += bytes[idx--]; | ||
| } | ||
|
|
||
| // Convert 24-bit integer to octal without adding leading zeros. | ||
| var octal = Convert.ToString(int24, 8); | ||
|
|
||
| // Ensure leading zero exists if value is positive. | ||
| if (octal[0] != '0' && bigint.Sign == 1) { | ||
| base8.Append('0'); | ||
| } | ||
|
|
||
| // Append first converted chunk to StringBuilder. | ||
| base8.Append(octal); | ||
|
|
||
| // Convert remaining 24-bit chunks, adding leading zeros. | ||
| for (; idx >= 0; idx -= 3) { | ||
| int24 = (bytes[idx] << 16) + (bytes[idx - 1] << 8) + bytes[idx - 2]; | ||
| base8.Append(Convert.ToString(int24, 8).PadLeft(8, '0')); | ||
| } | ||
|
|
||
| return base8.ToString(); | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// | ||
| /// Reverse a Positive BigInteger ONLY | ||
| /// Bitwise ~ operator | ||
| /// | ||
| /// Input : FF FF FF FF | ||
| /// Width : 4 | ||
| /// Result : 00 00 00 00 | ||
| /// | ||
| /// | ||
| /// Input : 00 00 00 00 | ||
| /// Width : 4 | ||
| /// Result : FF FF FF FF | ||
| /// | ||
| /// Input : FF FF FF FF | ||
| /// Width : 8 | ||
| /// Result : FF FF FF FF 00 00 00 00 | ||
| /// | ||
| /// | ||
| /// Input : 00 00 00 00 | ||
| /// Width : 8 | ||
| /// Result : FF FF FF FF FF FF FF FF | ||
| /// | ||
| /// </summary> | ||
| /// <param name="input"></param> | ||
| /// <param name="width"></param> | ||
| /// <returns></returns> | ||
| public static BigInteger PositiveReverse(this BigInteger input, int width) { | ||
|
|
||
| var result = new List<byte>(); | ||
| var bytes = input.ToByteArray(); | ||
| var work = new byte[width]; | ||
| Array.Copy(bytes, 0, work, 0, bytes.Length - 1); // Length -1 : positive BigInteger | ||
|
|
||
| for (int i = 0; i < work.Length; i++) { | ||
| result.Add((byte)(~work[i])); | ||
| } | ||
| result.Add(0); // positive BigInteger | ||
| return new BigInteger(result.ToArray()); | ||
|
|
||
| } | ||
| } | ||
| } |
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