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Copy pathBitArrayExtensions.cs
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347 lines (313 loc) · 10.5 KB
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using System.Collections;
using System.Security.Cryptography;
namespace BytecodeApi.Extensions;
/// <summary>
/// Provides a set of <see langword="static" /> methods for interaction with <see cref="BitArray" /> objects.
/// </summary>
public static class BitArrayExtensions
{
extension(BitArray array)
{
/// <summary>
/// Returns the number of values in this <see cref="BitArray" /> whose value is <see langword="true" />.
/// </summary>
public int CountTrue
{
get
{
Check.ArgumentNull(array);
int count = 0;
foreach (bool value in array)
{
if (value)
{
count++;
}
}
return count;
}
}
/// <summary>
/// Returns the number of values in this <see cref="BitArray" /> whose value is <see langword="false" />.
/// </summary>
public int CountFalse
{
get
{
Check.ArgumentNull(array);
return array.Length - array.CountTrue;
}
}
/// <summary>
/// Returns a value indicating whether all elements of this <see cref="BitArray" /> are <see langword="true" />.
/// </summary>
public bool AllTrue
{
get
{
Check.ArgumentNull(array);
foreach (bool value in array)
{
if (!value)
{
return false;
}
}
return true;
}
}
/// <summary>
/// Returns a value indicating whether all elements of this <see cref="BitArray" /> are <see langword="false" />.
/// </summary>
public bool AllFalse
{
get
{
Check.ArgumentNull(array);
foreach (bool value in array)
{
if (value)
{
return false;
}
}
return true;
}
}
/// <summary>
/// Converts the bits of this <see cref="BitArray" /> to an equivalent <see cref="bool" />[].
/// </summary>
/// <returns>
/// An equivalent <see cref="bool" />[] representing this <see cref="BitArray" />.
/// </returns>
public bool[] ToBooleanArray()
{
Check.ArgumentNull(array);
bool[] values = new bool[array.Length];
for (int i = 0; i < values.Length; i++)
{
values[i] = array[i];
}
return values;
}
/// <summary>
/// Converts the bits of this <see cref="BitArray" /> to an equivalent <see cref="byte" />[]. If there is a padding of less than 8 bits, the last byte contains the remaining bits.
/// </summary>
/// <returns>
/// An equivalent <see cref="byte" />[] representing this <see cref="BitArray" />.
/// </returns>
public byte[] ToByteArray()
{
Check.ArgumentNull(array);
byte[] bytes = new byte[(array.Length + 7) / 8];
for (int i = 0, position = 0; i < bytes.Length; i++)
{
for (int j = 0; j < 8 && position < array.Length; j++, position++)
{
if (array[position])
{
bytes[i] = (byte)(bytes[i] | 1 << j);
}
}
}
return bytes;
}
/// <summary>
/// Converts the bits of this <see cref="BitArray" /> to a <see cref="string" /> containing a sequence of '0' or '1' characters.
/// </summary>
/// <returns>
/// An equivalent sequence of '0' or '1' characters representing this <see cref="BitArray" />.
/// </returns>
public string ToBitString()
{
Check.ArgumentNull(array);
char[] str = new char[array.Length];
for (int i = 0; i < str.Length; i++)
{
str[i] = array[i] ? '1' : '0';
}
return str.AsString();
}
/// <summary>
/// Compares the content of this <see cref="BitArray" /> agains another <see cref="BitArray" />. Returns <see langword="true" />, if both arrays contain the exact same set of data.
/// </summary>
/// <param name="otherArray">A <see cref="BitArray" /> to compare to this <see cref="BitArray" />.</param>
/// <returns>
/// <see langword="true" />, if both arrays contain the exact same set of data;
/// otherwise, <see langword="false" />.
/// </returns>
public bool Compare([NotNullWhen(true)] BitArray? otherArray)
{
Check.ArgumentNull(array);
if (otherArray == null)
{
return false;
}
else if (array == otherArray)
{
return true;
}
else if (array.Length == otherArray.Length)
{
for (int i = 0; i < array.Length; i++)
{
if (array[i] != otherArray[i])
{
return false;
}
}
return true;
}
else
{
return false;
}
}
/// <summary>
/// Copies a specified number of bits from this <see cref="BitArray" /> and returns a new <see cref="BitArray" /> representing a fraction of the original <see cref="BitArray" />.
/// </summary>
/// <param name="index">A <see cref="int" /> value specifying the offset from which to start copying bits.</param>
/// <param name="count">A <see cref="int" /> value specifying the number of bits to copy.</param>
/// <returns>
/// A new <see cref="BitArray" /> representing a fraction of the original <see cref="BitArray" />.
/// </returns>
public BitArray GetBits(int index, int count)
{
Check.ArgumentNull(array);
Check.ArgumentOutOfRangeEx.GreaterEqual0(index);
Check.ArgumentOutOfRangeEx.GreaterEqual0(count);
Check.ArgumentEx.OffsetAndLengthOutOfBounds(index, count, array.Length);
BitArray copy = new(count);
for (int i = 0; i < count; i++)
{
copy[i] = array[index + i];
}
return copy;
}
/// <summary>
/// Sets all bits in the specified range in this <see cref="BitArray" /> to the specified value.
/// </summary>
/// <param name="offset">The zero-based index in this <see cref="BitArray" /> at which to begin writing values.</param>
/// <param name="count">The number of values to write.</param>
/// <param name="value">The <see cref="bool" /> value to assign to all bits in the specified range.</param>
public void SetAll(int offset, int count, bool value)
{
Check.ArgumentNull(array);
Check.ArgumentOutOfRangeEx.GreaterEqual0(offset);
Check.ArgumentOutOfRangeEx.GreaterEqual0(count);
Check.ArgumentEx.OffsetAndLengthOutOfBounds(offset, count, array.Length);
for (int i = offset; i < offset + count; i++)
{
array[i] = value;
}
}
/// <summary>
/// Sets the values of this <see cref="BitArray" /> to random values.
/// </summary>
public void SetRandomValues()
{
array.SetRandomValues(0, array.Length);
}
/// <summary>
/// Sets the values of this <see cref="BitArray" /> to random values.
/// </summary>
/// <param name="cryptographic"><see langword="true" /> to generate cryptographic random values.</param>
public void SetRandomValues(bool cryptographic)
{
array.SetRandomValues(0, array.Length, cryptographic);
}
/// <summary>
/// Sets the values of this <see cref="BitArray" /> to random values.
/// </summary>
/// <param name="offset">The zero-based index in this <see cref="BitArray" /> at which to begin writing values.</param>
/// <param name="count">The number of values to write.</param>
public void SetRandomValues(int offset, int count)
{
array.SetRandomValues(offset, count, false);
}
/// <summary>
/// Sets the values of this <see cref="BitArray" /> to random values.
/// </summary>
/// <param name="offset">The zero-based index in this <see cref="BitArray" /> at which to begin writing values.</param>
/// <param name="count">The number of values to write.</param>
/// <param name="cryptographic"><see langword="true" /> to generate cryptographic random values.</param>
public void SetRandomValues(int offset, int count, bool cryptographic)
{
Check.ArgumentNull(array);
Check.ArgumentOutOfRangeEx.GreaterEqual0(offset);
Check.ArgumentOutOfRangeEx.GreaterEqual0(count);
Check.ArgumentEx.OffsetAndLengthOutOfBounds(offset, count, array.Length);
byte[] buffer = new byte[16];
int bufferPosition = int.MaxValue;
if (cryptographic)
{
for (int i = offset; i < offset + count; i++)
{
if (bufferPosition >= buffer.Length << 3)
{
RandomNumberGenerator.Fill(buffer);
bufferPosition = 0;
}
array[i] = (buffer[bufferPosition >> 3] & 1 << (bufferPosition & 7)) > 0;
bufferPosition++;
}
}
else
{
for (int i = offset; i < offset + count; i++)
{
if (bufferPosition >= buffer.Length << 3)
{
Random.Shared.NextBytes(buffer);
bufferPosition = 0;
}
array[i] = (buffer[bufferPosition >> 3] & 1 << (bufferPosition & 7)) > 0;
bufferPosition++;
}
}
}
/// <summary>
/// Copies a specified number of elements from this <see cref="BitArray" /> to <paramref name="dest" />, beginning at the specified source offset, written to the specified destination offset.
/// </summary>
/// <param name="sourceOffset">The offset, at which to start reading from this <see cref="BitArray" />.</param>
/// <param name="dest">The <see cref="BitArray" /> that is written to.</param>
/// <param name="destOffset">The offset, at which to start writing to <paramref name="dest" />.</param>
/// <param name="count">The number of <see cref="bool" /> values to copy.</param>
public void CopyTo(int sourceOffset, BitArray dest, int destOffset, int count)
{
Check.ArgumentNull(array);
Check.ArgumentOutOfRangeEx.GreaterEqual0(sourceOffset);
Check.ArgumentNull(dest);
Check.ArgumentOutOfRangeEx.GreaterEqual0(destOffset);
Check.ArgumentOutOfRangeEx.GreaterEqual0(count);
Check.ArgumentEx.OffsetAndLengthOutOfBounds(sourceOffset, count, array.Length);
Check.ArgumentEx.OffsetAndLengthOutOfBounds(destOffset, count, dest.Length);
for (int i = 0; i < count; i++)
{
dest[i + destOffset] = array[i + sourceOffset];
}
}
/// <summary>
/// Merges all <see cref="BitArray" /> objects and returns a new <see cref="BitArray" />, where <paramref name="otherArrays" /> are concatenated after this array.
/// </summary>
/// <param name="otherArrays">An array of <see cref="BitArray" /> objects to append.</param>
/// <returns>
/// A new <see cref="BitArray" /> starting with this <see cref="BitArray" />, followed by all elements from <paramref name="otherArrays" />.
/// </returns>
public BitArray Concat(params BitArray[] otherArrays)
{
Check.ArgumentNull(array);
Check.ArgumentNull(otherArrays);
Check.ArgumentEx.ArrayValuesNotNull(otherArrays);
BitArray result = new(array.Length + otherArrays.Sum(other => other.Length));
array.CopyTo(0, result, 0, array.Length);
int offset = array.Length;
foreach (BitArray other in otherArrays)
{
other.CopyTo(0, result, offset, other.Length);
offset += other.Length;
}
return result;
}
}
}