GARbro-mirror/GameRes/ByteArray.cs

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//! \file ByteArray.cs
//! \date Sun Oct 16 06:25:52 2016
//! \brief specialized collection for copy-on-write byte arrays.
//
// Copyright (C) 2016 by morkt
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.
//
using System;
using System.Collections;
using System.Collections.Generic;
using GameRes.Utility;
namespace GameRes
{
/// <summary>
/// Array segment with copy-on-write semantics.
/// </summary>
public struct CowArray<T> : IList<T>
{
T[] m_source;
int m_offset;
int m_count;
bool m_own_copy;
public CowArray (T[] src) : this (src, 0, src.Length)
{
}
public CowArray (T[] src, int start, int length)
{
m_source = src;
m_offset = start;
m_count = length;
m_own_copy = false;
}
public int Count { get { return m_count; } }
public int Length { get { return Count; } }
public bool IsReadOnly { get { return true; } }
public T this[int pos]
{
get { return m_source[m_offset+pos]; }
set
{
if (!m_own_copy)
{
Reclaim();
}
m_source[pos] = value;
}
}
public int IndexOf (T item)
{
return Array.IndexOf<T> (m_source, item, m_offset, m_count);
}
public bool Contains (T item)
{
return IndexOf (item) != -1;
}
public void CopyTo (T[] arr, int dst)
{
Array.Copy (m_source, m_offset, arr, dst, m_count);
}
public IEnumerator<T> GetEnumerator ()
{
for (int i = 0; i < m_count; ++i)
yield return m_source[m_offset + i];
}
IEnumerator IEnumerable.GetEnumerator ()
{
return GetEnumerator();
}
public T[] ToArray ()
{
if (m_own_copy)
return m_source;
var copy = new T[m_count];
Array.Copy (m_source, m_offset, copy, 0, m_count);
return copy;
}
internal void Reclaim ()
{
m_source = ToArray();
m_offset = 0;
m_own_copy = true;
}
#region Not supported methods
public void Insert (int index, T item)
{
throw new NotSupportedException();
}
public bool Remove (T item)
{
throw new NotSupportedException();
}
public void RemoveAt (int index)
{
throw new NotSupportedException();
}
public void Add (T item)
{
throw new NotSupportedException();
}
public void Clear ()
{
throw new NotSupportedException();
}
#endregion
}
public static class ByteArrayExt
{
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public static ushort ToUInt16<TArray> (this TArray arr, int index) where TArray : IList<byte>
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{
return (ushort)(arr[index] | arr[index+1] << 8);
}
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public static short ToInt16<TArray> (this TArray arr, int index) where TArray : IList<byte>
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{
return (short)(arr[index] | arr[index+1] << 8);
}
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public static int ToInt24<TArray> (this TArray arr, int index) where TArray : IList<byte>
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{
return arr[index] | arr[index+1] << 8 | arr[index+2] << 16;
}
public static uint ToUInt32<TArray> (this TArray arr, int index) where TArray : IList<byte>
{
return (uint)(arr[index] | arr[index+1] << 8 | arr[index+2] << 16 | arr[index+3] << 24);
}
public static int ToInt32<TArray> (this TArray arr, int index) where TArray : IList<byte>
{
return (int)ToUInt32 (arr, index);
}
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public static ulong ToUInt64<TArray> (this TArray arr, int index) where TArray : IList<byte>
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{
return (ulong)ToUInt32 (arr, index) | ((ulong)ToUInt32 (arr, index+4) << 32);
}
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public static long ToInt64<TArray> (this TArray arr, int index) where TArray : IList<byte>
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{
return (long)ToUInt64 (arr, index);
}
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public static bool AsciiEqual<TArray> (this TArray arr, int index, string str) where TArray : IList<byte>
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{
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if (arr.Count-index < str.Length)
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return false;
for (int i = 0; i < str.Length; ++i)
if ((char)arr[index+i] != str[i])
return false;
return true;
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}
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public static bool AsciiEqual<TArray> (this TArray arr, string str) where TArray : IList<byte>
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{
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return arr.AsciiEqual (0, str);
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}
public static string GetCString (this CowArray<byte> arr, int index, int length_limit)
{
arr.Reclaim();
return Binary.GetCString (arr.ToArray(), index, length_limit);
}
}
}