80 lines
2.3 KiB
C#
80 lines
2.3 KiB
C#
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using System;
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namespace Unity.Cloud.UserReporting
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{
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/// <summary>
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/// Provides static methods for helping with PNG images.
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/// </summary>
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public static class PngHelper
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{
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#region Static Methods
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/// <summary>
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/// Gets a PNG image's height from base 64 encoded data.
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/// </summary>
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/// <param name="data">The data.</param>
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/// <returns>The height.</returns>
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public static int GetPngHeightFromBase64Data(string data)
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{
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// Preconditions
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if (data == null || data.Length < 32)
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{
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return 0;
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}
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// Implementation
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byte[] bytes = Convert.FromBase64String(data.Substring(0, 32));
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byte[] heightBytes = PngHelper.Slice(bytes, 20, 24);
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Array.Reverse(heightBytes);
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int height = BitConverter.ToInt32(heightBytes, 0);
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return height;
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}
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/// <summary>
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/// Gets a PNG image's width from base 64 encoded data.
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/// </summary>
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/// <param name="data">The data.</param>
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/// <returns>The width.</returns>
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public static int GetPngWidthFromBase64Data(string data)
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{
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// Preconditions
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if (data == null || data.Length < 32)
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{
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return 0;
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}
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// Implementation
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byte[] bytes = Convert.FromBase64String(data.Substring(0, 32));
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byte[] widthBytes = PngHelper.Slice(bytes, 16, 20);
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Array.Reverse(widthBytes);
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int width = BitConverter.ToInt32(widthBytes, 0);
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return width;
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}
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/// <summary>
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/// Slices a byte array.
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/// </summary>
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/// <param name="source">The source.</param>
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/// <param name="start">The start.</param>
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/// <param name="end">The end.</param>
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/// <returns>The slices byte array.</returns>
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private static byte[] Slice(byte[] source, int start, int end)
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{
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if (end < 0)
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{
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end = source.Length + end;
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}
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int len = end - start;
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byte[] res = new byte[len];
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for (int i = 0; i < len; i++)
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{
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res[i] = source[i + start];
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}
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return res;
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}
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#endregion
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}
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}
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