mirror of
https://github.com/fadden/6502bench.git
synced 2024-11-18 15:06:07 +00:00
df823f4c09
This allows rendering of a vertex directly, rather than just as an edge endpoint. They're currently drawn as small '+' signs. A round dot would be better, but the code is passing a list of line segments around, so this is simpler.
102 lines
4.2 KiB
C#
102 lines
4.2 KiB
C#
/*
|
|
* Copyright 2018 faddenSoft
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
using System;
|
|
using System.Diagnostics;
|
|
|
|
namespace CommonUtil {
|
|
public class RawData {
|
|
/// <summary>
|
|
/// Extracts an integer from the data stream. Integers less than 4 bytes wide
|
|
/// are not sign-extended.
|
|
/// </summary>
|
|
/// <param name="data">Raw data stream.</param>
|
|
/// <param name="offset">Start offset.</param>
|
|
/// <param name="width">Word width, which may be 1-4 bytes.</param>
|
|
/// <param name="isBigEndian">True if word is in big-endian order.</param>
|
|
/// <returns>Value found.</returns>
|
|
public static int GetWord(byte[] data, int offset, int width, bool isBigEndian) {
|
|
if (width < 1 || width > 4 || offset + width > data.Length) {
|
|
throw new ArgumentOutOfRangeException("GetWord(offset=" + offset + " width=" +
|
|
width + "), data.Length=" + data.Length);
|
|
}
|
|
if (isBigEndian) {
|
|
switch (width) {
|
|
case 1:
|
|
return data[offset];
|
|
case 2:
|
|
return (data[offset] << 8) | data[offset + 1];
|
|
case 3:
|
|
return (data[offset] << 16) | (data[offset + 1] << 8) | data[offset + 2];
|
|
case 4:
|
|
return (data[offset] << 24) | (data[offset + 1] << 16) |
|
|
(data[offset + 2] << 8) | data[offset + 3];
|
|
}
|
|
} else {
|
|
switch (width) {
|
|
case 1:
|
|
return data[offset];
|
|
case 2:
|
|
return data[offset] | (data[offset + 1] << 8);
|
|
case 3:
|
|
return data[offset] | (data[offset + 1] << 8) | (data[offset + 2] << 16);
|
|
case 4:
|
|
return data[offset] | (data[offset + 1] << 8) | (data[offset + 2] << 16) |
|
|
data[offset + 3] << 24;
|
|
}
|
|
}
|
|
|
|
throw new Exception("GetWord(): should not be here");
|
|
}
|
|
|
|
/// <summary>
|
|
/// Fetches a two-byte little-endian value from a byte stream, advancing the offset.
|
|
/// </summary>
|
|
/// <param name="data">Byte stream.</param>
|
|
/// <param name="offset">Initial offset. Value will be incremented by 2.</param>
|
|
/// <returns>Value fetched.</returns>
|
|
public static ushort FetchLittleUshort(byte[] data, ref int offset) {
|
|
ushort val = (ushort)(data[offset] | (data[offset + 1] << 8));
|
|
offset += 2;
|
|
return val;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Compare parts of two arrays for equality.
|
|
/// </summary>
|
|
/// <remarks>
|
|
/// We can do this faster with unsafe code. For byte arrays, see
|
|
/// https://stackoverflow.com/q/43289/294248 .
|
|
/// </remarks>
|
|
/// <param name="ar1">First array.</param>
|
|
/// <param name="offset1">Initial offset in first array.</param>
|
|
/// <param name="ar2">Second array.</param>
|
|
/// <param name="offset2">Initial offset in second array.</param>
|
|
/// <param name="count">Number of elements to compare.</param>
|
|
/// <returns>True if the array elements are equal.</returns>
|
|
public static bool CompareArrays<T>(T[] ar1, int offset1, T[] ar2, int offset2,
|
|
int count) {
|
|
Debug.Assert(count > 0);
|
|
|
|
for (int i = 0; i < count; i++) {
|
|
if (!ar1[offset1 + i].Equals(ar2[offset2 + i])) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
}
|
|
}
|