mirror of https://github.com/Radarr/Radarr
94 lines
2.6 KiB
C#
94 lines
2.6 KiB
C#
using System;
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namespace MonoTorrent
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{
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public class Hashes
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{
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#region Constants
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/// <summary>
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/// Hash code length (in bytes)
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/// </summary>
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internal static readonly int HashCodeLength = 20;
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#endregion
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#region Private Fields
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private int count;
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private byte[] hashData;
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#endregion Private Fields
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#region Properties
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/// <summary>
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/// Number of Hashes (equivalent to number of Pieces)
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/// </summary>
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public int Count
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{
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get { return this.count; }
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}
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#endregion Properties
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#region Constructors
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internal Hashes(byte[] hashData, int count)
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{
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this.hashData = hashData;
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this.count = count;
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}
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#endregion Constructors
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#region Methods
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/// <summary>
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/// Determine whether a calculated hash is equal to our stored hash
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/// </summary>
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/// <param name="hash">Hash code to check</param>
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/// <param name="hashIndex">Index of hash/piece to verify against</param>
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/// <returns>true iff hash is equal to our stored hash, false otherwise</returns>
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public bool IsValid(byte[] hash, int hashIndex)
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{
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if (hash == null)
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throw new ArgumentNullException("hash");
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if (hash.Length != HashCodeLength)
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throw new ArgumentException(string.Format("Hash must be {0} bytes in length", HashCodeLength), "hash");
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if (hashIndex < 0 || hashIndex > this.count)
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throw new ArgumentOutOfRangeException("hashIndex", string.Format("hashIndex must be between 0 and {0}", this.count));
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int start = hashIndex * HashCodeLength;
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for (int i = 0; i < HashCodeLength; i++)
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if (hash[i] != this.hashData[i + start])
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return false;
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return true;
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}
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/// <summary>
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/// Returns the hash for a specific piece
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/// </summary>
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/// <param name="hashIndex">Piece/hash index to return</param>
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/// <returns>byte[] (length HashCodeLength) containing hashdata</returns>
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public byte[] ReadHash(int hashIndex)
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{
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if (hashIndex < 0 || hashIndex >= this.count)
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throw new ArgumentOutOfRangeException("hashIndex");
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// Read out our specified piece's hash data
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byte[] hash = new byte[HashCodeLength];
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Buffer.BlockCopy(this.hashData, hashIndex * HashCodeLength, hash, 0, HashCodeLength);
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return hash;
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}
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#endregion Methods
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}
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}
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