491 lines
16 KiB
C#
491 lines
16 KiB
C#
using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using SharpCompress.Archive;
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using SharpCompress.Common;
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using SharpCompress.IO;
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namespace SharpCompress
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{
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internal static class Utility
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{
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public static ReadOnlyCollection<T> ToReadOnly<T>(this IEnumerable<T> items)
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{
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return new ReadOnlyCollection<T>(items.ToList());
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}
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/// <summary>
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/// Performs an unsigned bitwise right shift with the specified number
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/// </summary>
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/// <param name="number">Number to operate on</param>
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/// <param name="bits">Ammount of bits to shift</param>
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/// <returns>The resulting number from the shift operation</returns>
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public static int URShift(int number, int bits)
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{
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if (number >= 0)
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return number >> bits;
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else
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return (number >> bits) + (2 << ~bits);
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}
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/// <summary>
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/// Performs an unsigned bitwise right shift with the specified number
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/// </summary>
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/// <param name="number">Number to operate on</param>
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/// <param name="bits">Ammount of bits to shift</param>
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/// <returns>The resulting number from the shift operation</returns>
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public static int URShift(int number, long bits)
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{
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return URShift(number, (int)bits);
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}
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/// <summary>
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/// Performs an unsigned bitwise right shift with the specified number
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/// </summary>
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/// <param name="number">Number to operate on</param>
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/// <param name="bits">Ammount of bits to shift</param>
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/// <returns>The resulting number from the shift operation</returns>
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public static long URShift(long number, int bits)
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{
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if (number >= 0)
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return number >> bits;
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else
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return (number >> bits) + (2L << ~bits);
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}
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/// <summary>
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/// Performs an unsigned bitwise right shift with the specified number
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/// </summary>
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/// <param name="number">Number to operate on</param>
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/// <param name="bits">Ammount of bits to shift</param>
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/// <returns>The resulting number from the shift operation</returns>
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public static long URShift(long number, long bits)
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{
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return URShift(number, (int)bits);
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}
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/// <summary>
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/// Fills the array with an specific value from an specific index to an specific index.
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/// </summary>
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/// <param name="array">The array to be filled.</param>
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/// <param name="fromindex">The first index to be filled.</param>
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/// <param name="toindex">The last index to be filled.</param>
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/// <param name="val">The value to fill the array with.</param>
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public static void Fill<T>(T[] array, int fromindex, int toindex, T val) where T : struct
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{
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if (array.Length == 0)
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{
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throw new NullReferenceException();
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}
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if (fromindex > toindex)
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{
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throw new ArgumentException();
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}
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if ((fromindex < 0) || ((System.Array)array).Length < toindex)
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{
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throw new IndexOutOfRangeException();
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}
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for (int index = (fromindex > 0) ? fromindex-- : fromindex; index < toindex; index++)
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{
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array[index] = val;
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}
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}
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/// <summary>
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/// Fills the array with an specific value.
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/// </summary>
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/// <param name="array">The array to be filled.</param>
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/// <param name="val">The value to fill the array with.</param>
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public static void Fill<T>(T[] array, T val) where T : struct
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{
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Fill(array, 0, array.Length, val);
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}
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public static void SetSize(this List<byte> list, int count)
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{
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if (count > list.Count)
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{
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for (int i = list.Count; i < count; i++)
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{
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list.Add(0x0);
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}
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}
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else
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{
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byte[] temp = new byte[count];
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list.CopyTo(temp, 0);
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list.Clear();
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list.AddRange(temp);
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}
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}
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/// <summary> Read a int value from the byte array at the given position (Big Endian)
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///
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/// </summary>
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/// <param name="array">the array to read from
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/// </param>
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/// <param name="pos">the offset
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/// </param>
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/// <returns> the value
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/// </returns>
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public static int readIntBigEndian(byte[] array, int pos)
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{
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int temp = 0;
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temp |= array[pos] & 0xff;
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temp <<= 8;
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temp |= array[pos + 1] & 0xff;
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temp <<= 8;
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temp |= array[pos + 2] & 0xff;
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temp <<= 8;
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temp |= array[pos + 3] & 0xff;
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return temp;
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}
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/// <summary> Read a short value from the byte array at the given position (little
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/// Endian)
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///
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/// </summary>
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/// <param name="array">the array to read from
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/// </param>
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/// <param name="pos">the offset
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/// </param>
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/// <returns> the value
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/// </returns>
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public static short readShortLittleEndian(byte[] array, int pos)
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{
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return BitConverter.ToInt16(array, pos);
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}
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/// <summary> Read an int value from the byte array at the given position (little
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/// Endian)
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///
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/// </summary>
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/// <param name="array">the array to read from
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/// </param>
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/// <param name="pos">the offset
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/// </param>
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/// <returns> the value
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/// </returns>
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public static int readIntLittleEndian(byte[] array, int pos)
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{
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return BitConverter.ToInt32(array, pos);
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}
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/// <summary> Write an int value into the byte array at the given position (Big endian)
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///
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/// </summary>
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/// <param name="array">the array
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/// </param>
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/// <param name="pos">the offset
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/// </param>
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/// <param name="value">the value to write
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/// </param>
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public static void writeIntBigEndian(byte[] array, int pos, int value)
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{
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array[pos] = (byte)((Utility.URShift(value, 24)) & 0xff);
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array[pos + 1] = (byte)((Utility.URShift(value, 16)) & 0xff);
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array[pos + 2] = (byte)((Utility.URShift(value, 8)) & 0xff);
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array[pos + 3] = (byte)((value) & 0xff);
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}
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/// <summary> Write a short value into the byte array at the given position (little
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/// endian)
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///
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/// </summary>
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/// <param name="array">the array
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/// </param>
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/// <param name="pos">the offset
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/// </param>
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/// <param name="value">the value to write
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/// </param>
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#if PORTABLE || NETFX_CORE
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public static void WriteLittleEndian(byte[] array, int pos, short value)
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{
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byte[] newBytes = BitConverter.GetBytes(value);
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Array.Copy(newBytes, 0, array, pos, newBytes.Length);
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}
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#else
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public static unsafe void WriteLittleEndian(byte[] array, int pos, short value)
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{
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fixed (byte* numRef = &(array[pos]))
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{
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*((short*)numRef) = value;
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}
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}
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#endif
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/// <summary> Increment a short value at the specified position by the specified amount
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/// (little endian).
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/// </summary>
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public static void incShortLittleEndian(byte[] array, int pos, short incrementValue)
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{
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short existingValue = BitConverter.ToInt16(array, pos);
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existingValue += incrementValue;
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WriteLittleEndian(array, pos, existingValue);
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//int c = Utility.URShift(((array[pos] & 0xff) + (dv & 0xff)), 8);
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//array[pos] = (byte)(array[pos] + (dv & 0xff));
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//if ((c > 0) || ((dv & 0xff00) != 0))
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//{
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// array[pos + 1] = (byte)(array[pos + 1] + ((Utility.URShift(dv, 8)) & 0xff) + c);
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//}
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}
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/// <summary> Write an int value into the byte array at the given position (little
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/// endian)
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///
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/// </summary>
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/// <param name="array">the array
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/// </param>
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/// <param name="pos">the offset
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/// </param>
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/// <param name="value">the value to write
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/// </param>
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#if PORTABLE || NETFX_CORE
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public static void WriteLittleEndian(byte[] array, int pos, int value)
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{
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byte[] newBytes = BitConverter.GetBytes(value);
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Array.Copy(newBytes, 0, array, pos, newBytes.Length);
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}
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#else
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public static unsafe void WriteLittleEndian(byte[] array, int pos, int value)
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{
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fixed (byte* numRef = &(array[pos]))
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{
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*((int*)numRef) = value;
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}
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}
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#endif
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public static void Initialize<T>(this T[] array, Func<T> func)
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{
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for (int i = 0; i < array.Length; i++)
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{
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array[i] = func();
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}
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}
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public static void AddRange<T>(this ICollection<T> destination, IEnumerable<T> source)
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{
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foreach (T item in source)
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{
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destination.Add(item);
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}
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}
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public static void ForEach<T>(this IEnumerable<T> items, Action<T> action)
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{
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foreach (T item in items)
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{
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action(item);
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}
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}
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public static IEnumerable<T> AsEnumerable<T>(this T item)
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{
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yield return item;
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}
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public static void CheckNotNull(this object obj, string name)
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{
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if (obj == null)
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{
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throw new ArgumentNullException(name);
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}
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}
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public static void CheckNotNullOrEmpty(this string obj, string name)
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{
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obj.CheckNotNull(name);
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if (obj.Length == 0)
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{
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throw new ArgumentException("String is empty.");
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}
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}
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public static void Skip(this Stream source, long advanceAmount)
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{
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byte[] buffer = new byte[32 * 1024];
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int read = 0;
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int readCount = 0;
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do
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{
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readCount = buffer.Length;
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if (readCount > advanceAmount)
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{
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readCount = (int)advanceAmount;
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}
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read = source.Read(buffer, 0, readCount);
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if (read < 0)
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{
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break;
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}
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advanceAmount -= read;
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if (advanceAmount == 0)
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{
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break;
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}
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} while (true);
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}
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public static void SkipAll(this Stream source)
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{
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byte[] buffer = new byte[32 * 1024];
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do
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{
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} while (source.Read(buffer, 0, buffer.Length) == buffer.Length);
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}
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public static byte[] UInt32ToBigEndianBytes(uint x)
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{
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return new byte[]
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{
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(byte) ((x >> 24) & 0xff),
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(byte) ((x >> 16) & 0xff),
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(byte) ((x >> 8) & 0xff),
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(byte) (x & 0xff)
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};
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}
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public static DateTime DosDateToDateTime(UInt16 iDate, UInt16 iTime)
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{
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int year = iDate / 512 + 1980;
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int month = iDate % 512 / 32;
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int day = iDate % 512 % 32;
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int hour = iTime / 2048;
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int minute = iTime % 2048 / 32;
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int second = iTime % 2048 % 32 * 2;
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if (iDate == UInt16.MaxValue || month == 0 || day == 0)
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{
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year = 1980;
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month = 1;
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day = 1;
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}
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if (iTime == UInt16.MaxValue)
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{
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hour = minute = second = 0;
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}
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DateTime dt;
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try
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{
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dt = new DateTime(year, month, day, hour, minute, second);
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}
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catch
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{
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dt = new DateTime();
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}
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return dt;
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}
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public static uint DateTimeToDosTime(this DateTime? dateTime)
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{
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if (dateTime == null)
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{
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return 0;
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}
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return (uint)(
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(dateTime.Value.Second / 2) | (dateTime.Value.Minute << 5) | (dateTime.Value.Hour << 11) |
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(dateTime.Value.Day << 16) | (dateTime.Value.Month << 21) |
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((dateTime.Value.Year - 1980) << 25));
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}
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public static DateTime DosDateToDateTime(UInt32 iTime)
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{
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return DosDateToDateTime((UInt16)(iTime / 65536),
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(UInt16)(iTime % 65536));
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}
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public static DateTime DosDateToDateTime(Int32 iTime)
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{
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return DosDateToDateTime((UInt32)iTime);
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}
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public static long TransferTo(this Stream source, Stream destination)
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{
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byte[] array = new byte[81920];
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int count;
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long total = 0;
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while ((count = source.Read(array, 0, array.Length)) != 0)
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{
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total += count;
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destination.Write(array, 0, count);
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}
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return total;
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}
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public static bool ReadFully(this Stream stream, byte[] buffer)
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{
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int total = 0;
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int read;
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while ((read = stream.Read(buffer, total, buffer.Length - total)) > 0)
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{
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total += read;
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if (total >= buffer.Length)
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{
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return true;
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}
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}
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return (total >= buffer.Length);
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}
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public static string TrimNulls(this string source)
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{
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return source.Replace('\0', ' ').Trim();
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}
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public static bool BinaryEquals(this byte[] source, byte[] target)
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{
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if (source.Length != target.Length)
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{
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return false;
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}
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for (int i = 0; i < source.Length; ++i)
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{
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if (source[i] != target[i])
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{
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return false;
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}
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}
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return true;
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}
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#if PORTABLE || NETFX_CORE
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public static void CopyTo(this byte[] array, byte[] destination, int index)
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{
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Array.Copy(array, 0, destination, index, array.Length);
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}
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public static long HostToNetworkOrder(long host)
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{
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return (int)((long)HostToNetworkOrder((int)host)
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& unchecked((long)(unchecked((ulong)-1))) << 32
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| ((long)HostToNetworkOrder((int)((int)host >> 32)) & unchecked((long)(unchecked((ulong)-1)))));
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}
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public static int HostToNetworkOrder(int host)
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{
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return (int)((int)(HostToNetworkOrder((short)host) & -1) << 16 | (HostToNetworkOrder((short)(host >> 16)) & -1));
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}
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public static short HostToNetworkOrder(short host)
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{
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return (short)((int)(host & 255) << 8 | ((int)host >> 8 & 255));
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}
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public static long NetworkToHostOrder(long network)
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{
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return HostToNetworkOrder(network);
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}
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public static int NetworkToHostOrder(int network)
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{
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return HostToNetworkOrder(network);
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}
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public static short NetworkToHostOrder(short network)
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{
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return HostToNetworkOrder(network);
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}
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#endif
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}
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} |