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78 lines
2.5 KiB
78 lines
2.5 KiB
// Copyright (c) Six Labors and contributors.
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// Licensed under the Apache License, Version 2.0.
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namespace SixLabors.ImageSharp.Tests
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{
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using ImageSharp.Formats.Tiff;
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using SixLabors.ImageSharp.MetaData.Profiles.Exif;
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using SixLabors.ImageSharp.Primitives;
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using Xunit;
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/// <summary>
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/// A utility data structure to decode Tiff IFD entries in unit tests.
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/// </summary>
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internal static class TiffIfdParser
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{
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public static int? GetInteger(this List<TiffIfdEntry> entries, ushort tag)
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{
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TiffIfdEntry entry = entries.FirstOrDefault(e => e.Tag == tag);
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if (entry.Tag == 0)
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return null;
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Assert.Equal(1u, entry.Count);
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switch (entry.Type)
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{
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case TiffType.Byte:
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return entry.Value[0];
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case TiffType.SByte:
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return (sbyte)entry.Value[0];
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case TiffType.Short:
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return BitConverter.ToUInt16(entry.Value, 0);
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case TiffType.SShort:
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return BitConverter.ToInt16(entry.Value, 0);
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case TiffType.Long:
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return (int)BitConverter.ToUInt32(entry.Value, 0);
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case TiffType.SLong:
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return BitConverter.ToInt32(entry.Value, 0);
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default:
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Assert.True(1 == 1, "TIFF IFD entry is not convertable to an integer.");
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return null;
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}
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}
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public static Rational? GetUnsignedRational(this List<TiffIfdEntry> entries, ushort tag)
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{
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TiffIfdEntry entry = entries.FirstOrDefault(e => e.Tag == tag);
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if (entry.Tag == 0)
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return null;
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Assert.Equal(TiffType.Rational, entry.Type);
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Assert.Equal(1u, entry.Count);
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uint numerator = BitConverter.ToUInt32(entry.Value, 0);
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uint denominator = BitConverter.ToUInt32(entry.Value, 4);
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return new Rational(numerator, denominator);
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}
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public static string GetAscii(this List<TiffIfdEntry> entries, ushort tag)
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{
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TiffIfdEntry entry = entries.FirstOrDefault(e => e.Tag == tag);
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if (entry.Tag == 0)
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return null;
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Assert.Equal(TiffType.Ascii, entry.Type);
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return Encoding.UTF8.GetString(entry.Value, 0, (int)entry.Count);
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}
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}
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}
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