mirror of
https://github.com/crskycode/GARbro.git
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375 lines
12 KiB
C#
375 lines
12 KiB
C#
//! \file Utility.cs
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//! \date Sat Jul 05 02:47:33 2014
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//! \brief utility classes for GameRes assembly.
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//
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// Copyright (C) 2014 by morkt
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to
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// deal in the Software without restriction, including without limitation the
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// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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// sell copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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// IN THE SOFTWARE.
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//
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using System.Collections.Generic;
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using System.Text;
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namespace GameRes.Utility
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{
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public static class Binary
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{
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public static uint BigEndian (uint u)
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{
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return u << 24 | (u & 0xff00) << 8 | (u & 0xff0000) >> 8 | u >> 24;
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}
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public static int BigEndian (int i)
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{
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return (int)BigEndian ((uint)i);
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}
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public static ushort BigEndian (ushort u)
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{
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return (ushort)(u << 8 | u >> 8);
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}
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public static short BigEndian (short i)
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{
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return (short)BigEndian ((ushort)i);
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}
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public static ulong BigEndian (ulong u)
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{
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return (ulong)BigEndian((uint)(u & 0xffffffff)) << 32
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| (ulong)BigEndian((uint)(u >> 32));
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}
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public static long BigEndian (long i)
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{
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return (long)BigEndian ((ulong)i);
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}
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public static bool AsciiEqual (byte[] name1, string name2)
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{
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return AsciiEqual (name1, 0, name2);
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}
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/// <summary>
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/// Check if sequence of ASCII characters in array <paramref name="name1"/> is equal to string <paramref name="name2"/>.
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/// This methods avoids costly construction of the string object from byte array for a mere purpose of
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/// comparison.
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/// </summary>
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public static bool AsciiEqual (byte[] name1, int offset, string name2)
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{
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return name1.AsciiEqual (offset, name2);
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}
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/// <summary>
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/// Copy potentially overlapping sequence of <paramref name="count"/> bytes in array
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/// <paramref name="data"/> from <paramref name="src"/> to <paramref name="dst"/>.
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/// If destination offset resides within source region then sequence will repeat itself. Widely used
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/// in various compression techniques.
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/// </summary>
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public static void CopyOverlapped (byte[] data, int src, int dst, int count)
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{
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if (dst > src)
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{
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while (count > 0)
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{
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int preceding = System.Math.Min (dst - src, count);
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System.Buffer.BlockCopy (data, src, data, dst, preceding);
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dst += preceding;
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count -= preceding;
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}
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}
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else
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{
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System.Buffer.BlockCopy (data, src, data, dst, count);
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}
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}
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/// <summary>
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/// Extract null-terminated string (a "C string") from array <paramref name="data"/> starting
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/// at offset <paramref name="index"/> up to <paramref name="length_limit"/> bytes long, stored in
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/// encoding <paramref name="enc"/>.
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/// </summary>
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public static string GetCString (byte[] data, int index, int length_limit, Encoding enc)
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{
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int name_length = 0;
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while (name_length < length_limit && 0 != data[index+name_length])
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name_length++;
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return enc.GetString (data, index, name_length);
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}
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public static string GetCString (byte[] data, int index, int length_limit)
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{
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return GetCString (data, index, length_limit, Encodings.cp932);
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}
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public static string GetCString (byte[] data, int index)
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{
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return GetCString (data, index, data.Length - index, Encodings.cp932);
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}
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public static uint RotR (uint v, int count)
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{
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count &= 0x1F;
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return v >> count | v << (32-count);
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}
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public static uint RotL (uint v, int count)
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{
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count &= 0x1F;
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return v << count | v >> (32-count);
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}
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public static ulong RotR (ulong v, int count)
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{
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count &= 0x3F;
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return v >> count | v << (64-count);
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}
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public static ulong RotL (ulong v, int count)
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{
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count &= 0x3F;
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return v << count | v >> (64-count);
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}
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public static byte RotByteR (byte v, int count)
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{
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count &= 7;
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return (byte)(v >> count | v << (8-count));
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}
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public static byte RotByteL (byte v, int count)
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{
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count &= 7;
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return (byte)(v << count | v >> (8-count));
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}
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}
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public static class BigEndian
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{
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public static ushort ToUInt16<TArray> (TArray value, int index) where TArray : IList<byte>
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{
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return (ushort)(value[index] << 8 | value[index+1]);
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}
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public static short ToInt16<TArray> (TArray value, int index) where TArray : IList<byte>
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{
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return (short)(value[index] << 8 | value[index+1]);
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}
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public static uint ToUInt32<TArray> (TArray value, int index) where TArray : IList<byte>
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{
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return (uint)(value[index] << 24 | value[index+1] << 16 | value[index+2] << 8 | value[index+3]);
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}
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public static int ToInt32<TArray> (TArray value, int index) where TArray : IList<byte>
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{
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return (int)ToUInt32 (value, index);
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}
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public static void Pack (ushort value, byte[] buf, int index)
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{
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buf[index] = (byte)(value >> 8);
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buf[index+1] = (byte)(value);
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}
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public static void Pack (uint value, byte[] buf, int index)
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{
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buf[index] = (byte)(value >> 24);
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buf[index+1] = (byte)(value >> 16);
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buf[index+2] = (byte)(value >> 8);
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buf[index+3] = (byte)(value);
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}
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public static void Pack (ulong value, byte[] buf, int index)
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{
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Pack ((uint)(value >> 32), buf, index);
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Pack ((uint)value, buf, index+4);
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}
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public static void Pack (short value, byte[] buf, int index)
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{
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Pack ((ushort)value, buf, index);
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}
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public static void Pack (int value, byte[] buf, int index)
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{
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Pack ((uint)value, buf, index);
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}
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public static void Pack (long value, byte[] buf, int index)
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{
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Pack ((ulong)value, buf, index);
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}
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}
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public static class LittleEndian
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{
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public static ushort ToUInt16<TArray> (TArray value, int index) where TArray : IList<byte>
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{
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return (ushort)(value[index] | value[index+1] << 8);
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}
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public static short ToInt16<TArray> (TArray value, int index) where TArray : IList<byte>
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{
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return (short)(value[index] | value[index+1] << 8);
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}
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public static uint ToUInt32<TArray> (TArray value, int index) where TArray : IList<byte>
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{
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return (uint)(value[index] | value[index+1] << 8 | value[index+2] << 16 | value[index+3] << 24);
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}
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public static int ToInt32<TArray> (TArray value, int index) where TArray : IList<byte>
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{
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return (int)ToUInt32 (value, index);
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}
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public static ulong ToUInt64<TArray> (TArray value, int index) where TArray : IList<byte>
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{
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return (ulong)ToUInt32 (value, index) | ((ulong)ToUInt32 (value, index+4) << 32);
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}
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public static long ToInt64<TArray> (TArray value, int index) where TArray : IList<byte>
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{
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return (long)ToUInt64 (value, index);
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}
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public static void Pack (ushort value, byte[] buf, int index)
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{
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buf[index] = (byte)(value);
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buf[index+1] = (byte)(value >> 8);
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}
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public static void Pack (uint value, byte[] buf, int index)
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{
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buf[index] = (byte)(value);
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buf[index+1] = (byte)(value >> 8);
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buf[index+2] = (byte)(value >> 16);
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buf[index+3] = (byte)(value >> 24);
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}
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public static void Pack (ulong value, byte[] buf, int index)
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{
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Pack ((uint)value, buf, index);
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Pack ((uint)(value >> 32), buf, index+4);
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}
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public static void Pack (short value, byte[] buf, int index)
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{
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Pack ((ushort)value, buf, index);
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}
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public static void Pack (int value, byte[] buf, int index)
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{
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Pack ((uint)value, buf, index);
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}
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public static void Pack (long value, byte[] buf, int index)
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{
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Pack ((ulong)value, buf, index);
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}
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}
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public class AsciiString
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{
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public byte[] Value { get; set; }
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public int Length { get { return Value.Length; } }
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public AsciiString (int size)
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{
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Value = new byte[size];
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}
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public AsciiString (byte[] str)
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{
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Value = str;
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}
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public AsciiString (string str)
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{
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Value = Encoding.ASCII.GetBytes (str);
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}
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public override string ToString ()
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{
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return Encoding.ASCII.GetString (Value);
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}
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public override bool Equals (object o)
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{
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if (null == o)
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return false;
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var a = o as AsciiString;
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if (null == (object)a)
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return false;
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return this == a;
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}
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public override int GetHashCode ()
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{
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int hash = 5381;
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for (int i = 0; i < Value.Length; ++i)
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{
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hash = ((hash << 5) + hash) ^ Value[i];
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}
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return hash ^ (hash * 1566083941);;
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}
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public static bool operator== (AsciiString a, AsciiString b)
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{
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if (ReferenceEquals (a, b))
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return true;
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if (null == (object)a || null == (object)b)
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return false;
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if (a.Length != b.Length)
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return false;
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for (int i = 0; i < a.Length; ++i)
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if (a.Value[i] != b.Value[i])
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return false;
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return true;
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}
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public static bool operator!= (AsciiString a, AsciiString b)
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{
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return !(a == b);
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}
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public static bool operator== (AsciiString a, string b)
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{
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return Binary.AsciiEqual (a.Value, b);
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}
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public static bool operator!= (AsciiString a, string b)
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{
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return !(a == b);
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}
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public static bool operator== (string a, AsciiString b)
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{
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return b == a;
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}
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public static bool operator!= (string a, AsciiString b)
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{
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return !(b == a);
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}
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}
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public interface IDataUnpacker
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{
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byte[] Data { get; }
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void Unpack ();
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}
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}
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