128 lines
4.0 KiB
C#
128 lines
4.0 KiB
C#
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using System;
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using System.Runtime.InteropServices;
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using System.Diagnostics;
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namespace Math.Gmp.Native
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{
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/// <summary>
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/// Represents a multiple precision integer.
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/// </summary>
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/// <remarks></remarks>
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/// <seealso cref="mp_limb_t"/>
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/// <seealso cref="mpf_t"/>
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/// <seealso cref="mpq_t"/>
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public class mpz_t : mp_base
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{
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/// <summary>
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/// Creates a new multiple precision integer.
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/// </summary>
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public mpz_t()
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{
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size_t length = /*sizeof(int) + sizeof(int)*/ 8 + (size_t)IntPtr.Size;
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_pointer = gmp_lib.allocate(length).ToIntPtr();
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gmp_lib.ZeroMemory(_pointer, (int)length);
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}
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internal mpz_t(IntPtr pointer)
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{
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_pointer = pointer;
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}
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/// <summary>
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/// The number of limbs currently allocated at <see cref="mp_base._mp_d"/>.
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/// </summary>
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/// <remarks>
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/// <para>
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/// <see cref="mpz_t._mp_alloc"/> is the number of limbs currently allocated at <see cref="mp_base._mp_d"/>,
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/// and naturally <see cref="mpz_t._mp_alloc"/> >= ABS(<see cref="mpz_t._mp_size"/>).
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/// When an mpz routine is about to (or might be about to) increase <see cref="mpz_t._mp_size"/>, it checks
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/// <see cref="mpz_t._mp_alloc"/> to see whether there’s enough space, and reallocates if not.
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/// </para>
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/// </remarks>
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public int _mp_alloc
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{
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get
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{
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return Marshal.ReadInt32(_pointer, 0);
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}
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}
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/// <summary>
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/// The number of limbs, or the negative of that when representing a negative integer.
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/// </summary>
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/// <remarks>
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/// <para>
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/// The number of limbs, or the negative of that when representing a negative integer.
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/// Zero is represented by <see cref="mp_base._mp_size"/> set to zero, in which case
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/// the <see cref="mp_base._mp_d"/> data is unused.
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/// </para>
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/// </remarks>
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public override mp_size_t _mp_size
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{
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get
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{
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return Marshal.ReadInt32(_pointer, sizeof(int));
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}
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}
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[DebuggerBrowsable(DebuggerBrowsableState.Never)]
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internal override IntPtr _mp_d_intptr
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{
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get
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{
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return Marshal.ReadIntPtr(_pointer, sizeof(int) + sizeof(int));
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}
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set
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{
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Marshal.WriteIntPtr(_pointer, sizeof(int) + sizeof(int), value);
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}
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}
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/// <summary>
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/// Gets the unmanaged memory pointer of the multiple precision integer.
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/// </summary>
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/// <returns>The unmanaged memory pointer of the multiple precision integer.</returns>
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public IntPtr ToIntPtr()
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{
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return _pointer;
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}
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/// <summary>
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/// Converts a <see cref="string"/> value to an <see cref="mpz_t"/> value.
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/// </summary>
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/// <param name="value">A <see cref="string"/> value.</param>
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/// <returns>An <see cref="mpz_t"/> value.</returns>
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/// <remarks>
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/// <para>
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/// The leading characters are used: <c>0x</c> and <c>0X</c> for hexadecimal,
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/// <c>0b</c> and <c>0B</c> for binary, <c>0</c> for octal, or decimal otherwise.
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/// </para>
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/// </remarks>
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public static implicit operator mpz_t(string value)
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{
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mpz_t x = new mpz_t();
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gmp_lib.mpz_init(x);
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char_ptr s = new char_ptr(value);
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gmp_lib.mpz_set_str(x, s, 0);
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gmp_lib.free(s);
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return x;
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}
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/// <summary>
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/// Return the string representation of the integer.
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/// </summary>
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/// <returns>The string representation of the integer.</returns>
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public override string ToString()
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{
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char_ptr s_ptr = gmp_lib.mpz_get_str(char_ptr.Zero, 10, this);
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string s = s_ptr.ToString();
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gmp_lib.free(s_ptr);
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return s;
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}
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}
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} |