mirror of https://github.com/SixLabors/ImageSharp
James Jackson-South
5 years ago
committed by
GitHub
GitHub
32 changed files with 488 additions and 1161 deletions
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// Copyright (c) Six Labors.
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// Licensed under the Apache License, Version 2.0.
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using System; |
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using System.IO; |
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namespace SixLabors.ImageSharp.Formats.Experimental.Tiff.Streams |
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{ |
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internal class TiffBigEndianStream : TiffStream |
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{ |
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public TiffBigEndianStream(Stream stream) |
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: base(stream) |
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{ |
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} |
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public override ByteOrder ByteOrder => ByteOrder.BigEndian; |
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/// <summary>
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/// Converts buffer data into an <see cref="short"/> using the correct endianness.
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/// </summary>
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/// <returns>The converted value.</returns>
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public override short ReadInt16() |
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{ |
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byte[] bytes = this.ReadBytes(2); |
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return (short)((bytes[0] << 8) | bytes[1]); |
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} |
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/// <summary>
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/// Converts buffer data into an <see cref="int"/> using the correct endianness.
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/// </summary>
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/// <returns>The converted value.</returns>
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public override int ReadInt32() |
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{ |
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byte[] bytes = this.ReadBytes(4); |
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return (bytes[0] << 24) | (bytes[1] << 16) | (bytes[2] << 8) | bytes[3]; |
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} |
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/// <summary>
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/// Converts buffer data into a <see cref="uint"/> using the correct endianness.
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/// </summary>
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/// <returns>The converted value.</returns>
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public override uint ReadUInt32() |
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{ |
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return (uint)this.ReadInt32(); |
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} |
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/// <summary>
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/// Converts buffer data into a <see cref="ushort"/> using the correct endianness.
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/// </summary>
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/// <returns>The converted value.</returns>
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public override ushort ReadUInt16() |
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{ |
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return (ushort)this.ReadInt16(); |
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} |
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/// <summary>
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/// Converts buffer data into a <see cref="float"/> using the correct endianness.
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/// </summary>
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/// <returns>The converted value.</returns>
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public override float ReadSingle() |
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{ |
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byte[] bytes = this.ReadBytes(4); |
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if (BitConverter.IsLittleEndian) |
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{ |
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Array.Reverse(bytes); |
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} |
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return BitConverter.ToSingle(bytes, 0); |
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} |
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/// <summary>
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/// Converts buffer data into a <see cref="double"/> using the correct endianness.
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/// </summary>
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/// <returns>The converted value.</returns>
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public override double ReadDouble() |
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{ |
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byte[] bytes = this.ReadBytes(8); |
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if (BitConverter.IsLittleEndian) |
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{ |
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Array.Reverse(bytes); |
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} |
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return BitConverter.ToDouble(bytes, 0); |
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} |
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} |
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} |
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@ -1,88 +0,0 @@ |
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// Copyright (c) Six Labors.
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// Licensed under the Apache License, Version 2.0.
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using System; |
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using System.IO; |
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namespace SixLabors.ImageSharp.Formats.Experimental.Tiff.Streams |
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{ |
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internal class TiffLittleEndianStream : TiffStream |
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{ |
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public TiffLittleEndianStream(Stream stream) |
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: base(stream) |
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{ |
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} |
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public override ByteOrder ByteOrder => ByteOrder.LittleEndian; |
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/// <summary>
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/// Converts buffer data into an <see cref="short"/> using the correct endianness.
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/// </summary>
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/// <returns>The converted value.</returns>
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public override short ReadInt16() |
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{ |
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byte[] bytes = this.ReadBytes(2); |
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return (short)(bytes[0] | (bytes[1] << 8)); |
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} |
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/// <summary>
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/// Converts buffer data into an <see cref="int"/> using the correct endianness.
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/// </summary>
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/// <returns>The converted value.</returns>
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public override int ReadInt32() |
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{ |
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byte[] bytes = this.ReadBytes(4); |
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return bytes[0] | (bytes[1] << 8) | (bytes[2] << 16) | (bytes[3] << 24); |
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} |
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/// <summary>
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/// Converts buffer data into a <see cref="uint"/> using the correct endianness.
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/// </summary>
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/// <returns>The converted value.</returns>
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public override uint ReadUInt32() |
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{ |
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return (uint)this.ReadInt32(); |
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} |
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/// <summary>
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/// Converts buffer data into a <see cref="ushort"/> using the correct endianness.
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/// </summary>
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/// <returns>The converted value.</returns>
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public override ushort ReadUInt16() |
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{ |
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return (ushort)this.ReadInt16(); |
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} |
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/// <summary>
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/// Converts buffer data into a <see cref="float"/> using the correct endianness.
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/// </summary>
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/// <returns>The converted value.</returns>
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public override float ReadSingle() |
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{ |
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byte[] bytes = this.ReadBytes(4); |
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if (!BitConverter.IsLittleEndian) |
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{ |
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Array.Reverse(bytes); |
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} |
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return BitConverter.ToSingle(bytes, 0); |
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} |
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/// <summary>
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/// Converts buffer data into a <see cref="double"/> using the correct endianness.
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/// </summary>
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/// <returns>The converted value.</returns>
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public override double ReadDouble() |
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{ |
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byte[] bytes = this.ReadBytes(8); |
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if (!BitConverter.IsLittleEndian) |
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{ |
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Array.Reverse(bytes); |
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} |
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return BitConverter.ToDouble(bytes, 0); |
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} |
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} |
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} |
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@ -1,94 +0,0 @@ |
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// Copyright (c) Six Labors.
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// Licensed under the Apache License, Version 2.0.
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using System.IO; |
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namespace SixLabors.ImageSharp.Formats.Experimental.Tiff.Streams |
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{ |
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/// <summary>
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/// The tiff data stream base class.
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/// </summary>
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internal abstract class TiffStream |
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{ |
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/// <summary>
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/// The input stream.
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/// </summary>
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private readonly Stream stream; |
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/// <summary>
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/// Initializes a new instance of the <see cref="TiffStream"/> class.
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/// </summary>
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/// <param name="stream">The stream.</param>
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protected TiffStream(Stream stream) |
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{ |
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this.stream = stream; |
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} |
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/// <summary>
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/// Gets a value indicating whether the file is encoded in little-endian or big-endian format.
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/// </summary>
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public abstract ByteOrder ByteOrder { get; } |
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/// <summary>
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/// Gets the input stream.
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/// </summary>
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public Stream InputStream => this.stream; |
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/// <summary>
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/// Gets the stream position.
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/// </summary>
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public long Position => this.stream.Position; |
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public void Seek(uint offset) |
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{ |
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this.stream.Seek(offset, SeekOrigin.Begin); |
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} |
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public void Skip(uint offset) |
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{ |
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this.stream.Seek(offset, SeekOrigin.Current); |
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} |
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public void Skip(int offset) |
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{ |
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this.stream.Seek(offset, SeekOrigin.Current); |
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} |
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/// <summary>
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/// Converts buffer data into a <see cref="byte"/> using the correct endianness.
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/// </summary>
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/// <returns>The converted value.</returns>
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public byte ReadByte() |
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{ |
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return (byte)this.stream.ReadByte(); |
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} |
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/// <summary>
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/// Converts buffer data into an <see cref="sbyte"/> using the correct endianness.
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/// </summary>
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/// <returns>The converted value.</returns>
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public sbyte ReadSByte() |
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{ |
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return (sbyte)this.stream.ReadByte(); |
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} |
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public byte[] ReadBytes(uint count) |
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{ |
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byte[] buf = new byte[count]; |
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this.stream.Read(buf, 0, buf.Length); |
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return buf; |
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} |
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public abstract short ReadInt16(); |
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public abstract int ReadInt32(); |
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public abstract uint ReadUInt32(); |
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public abstract ushort ReadUInt16(); |
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public abstract float ReadSingle(); |
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public abstract double ReadDouble(); |
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} |
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} |
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// Copyright (c) Six Labors.
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// Licensed under the Apache License, Version 2.0.
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using System.Linq; |
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using SixLabors.ImageSharp.Metadata.Profiles.Exif; |
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namespace SixLabors.ImageSharp.Formats.Experimental.Tiff |
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{ |
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/// <summary>
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/// The tiff metadata extensions
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/// </summary>
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internal static class TiffFrameMetadataExtensions |
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{ |
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public static T[] GetArray<T>(this TiffFrameMetadata meta, ExifTag tag, bool optional = false) |
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where T : struct |
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{ |
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if (meta.TryGetArray(tag, out T[] result)) |
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{ |
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return result; |
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} |
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if (!optional) |
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{ |
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TiffThrowHelper.ThrowTagNotFound(nameof(tag)); |
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} |
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return null; |
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} |
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public static bool TryGetArray<T>(this TiffFrameMetadata meta, ExifTag tag, out T[] result) |
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where T : struct |
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{ |
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foreach (IExifValue entry in meta.FrameTags) |
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{ |
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if (entry.Tag == tag) |
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{ |
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DebugGuard.IsTrue(entry.IsArray, "Expected array entry"); |
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result = (T[])entry.GetValue(); |
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return true; |
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} |
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} |
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result = null; |
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return false; |
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} |
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public static TEnum[] GetEnumArray<TEnum, TTagValue>(this TiffFrameMetadata meta, ExifTag tag, bool optional = false) |
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where TEnum : struct |
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where TTagValue : struct |
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{ |
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if (meta.TryGetArray(tag, out TTagValue[] result)) |
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{ |
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return result.Select(a => (TEnum)(object)a).ToArray(); |
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} |
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if (!optional) |
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{ |
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TiffThrowHelper.ThrowTagNotFound(nameof(tag)); |
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} |
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return null; |
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} |
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public static string GetString(this TiffFrameMetadata meta, ExifTag tag) |
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{ |
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foreach (IExifValue entry in meta.FrameTags) |
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{ |
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if (entry.Tag == tag) |
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{ |
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DebugGuard.IsTrue(entry.DataType == ExifDataType.Ascii, "Expected string entry"); |
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object value = entry.GetValue(); |
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DebugGuard.IsTrue(value is string, "Expected string entry"); |
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return (string)value; |
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} |
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} |
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return null; |
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} |
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public static bool SetString(this TiffFrameMetadata meta, ExifTag tag, string value) |
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{ |
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IExifValue obj = FindOrCreate(meta, tag); |
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DebugGuard.IsTrue(obj.DataType == ExifDataType.Ascii, "Expected string entry"); |
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return obj.TrySetValue(value); |
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} |
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public static TEnum? GetSingleEnumNullable<TEnum, TTagValue>(this TiffFrameMetadata meta, ExifTag tag) |
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where TEnum : struct |
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where TTagValue : struct |
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{ |
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if (!meta.TryGetSingle(tag, out TTagValue value)) |
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{ |
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return null; |
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} |
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return (TEnum)(object)value; |
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} |
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public static TEnum GetSingleEnum<TEnum, TTagValue>(this TiffFrameMetadata meta, ExifTag tag, TEnum? defaultValue = null) |
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where TEnum : struct |
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where TTagValue : struct |
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=> meta.GetSingleEnumNullable<TEnum, TTagValue>(tag) ?? (defaultValue != null ? defaultValue.Value : throw TiffThrowHelper.TagNotFound(nameof(tag))); |
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public static bool SetSingleEnum<TEnum, TTagValue>(this TiffFrameMetadata meta, ExifTag tag, TEnum value) |
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where TEnum : struct |
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where TTagValue : struct |
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{ |
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IExifValue obj = FindOrCreate(meta, tag); |
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object val = (TTagValue)(object)value; |
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return obj.TrySetValue(val); |
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} |
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public static T GetSingle<T>(this TiffFrameMetadata meta, ExifTag tag) |
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where T : struct |
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{ |
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if (meta.TryGetSingle(tag, out T result)) |
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{ |
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return result; |
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} |
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throw TiffThrowHelper.TagNotFound(nameof(tag)); |
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} |
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public static bool TryGetSingle<T>(this TiffFrameMetadata meta, ExifTag tag, out T result) |
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where T : struct |
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{ |
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foreach (IExifValue entry in meta.FrameTags) |
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{ |
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if (entry.Tag == tag) |
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{ |
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DebugGuard.IsTrue(!entry.IsArray, "Expected non array entry"); |
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object value = entry.GetValue(); |
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result = (T)value; |
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return true; |
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} |
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} |
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result = default; |
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return false; |
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} |
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public static bool SetSingle<T>(this TiffFrameMetadata meta, ExifTag tag, T value) |
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where T : struct |
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{ |
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IExifValue obj = FindOrCreate(meta, tag); |
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DebugGuard.IsTrue(!obj.IsArray, "Expected non array entry"); |
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object val = value; |
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return obj.TrySetValue(val); |
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} |
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public static bool Remove(this TiffFrameMetadata meta, ExifTag tag) |
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{ |
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IExifValue obj = null; |
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foreach (IExifValue entry in meta.FrameTags) |
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{ |
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if (entry.Tag == tag) |
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{ |
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obj = entry; |
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break; |
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} |
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} |
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if (obj != null) |
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{ |
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return meta.FrameTags.Remove(obj); |
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} |
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return false; |
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} |
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private static IExifValue FindOrCreate(TiffFrameMetadata meta, ExifTag tag) |
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{ |
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IExifValue obj = null; |
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foreach (IExifValue entry in meta.FrameTags) |
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{ |
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if (entry.Tag == tag) |
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{ |
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obj = entry; |
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break; |
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} |
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} |
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if (obj == null) |
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{ |
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obj = ExifValues.Create(tag); |
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meta.FrameTags.Add(obj); |
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} |
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return obj; |
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} |
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} |
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} |
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@ -0,0 +1,3 @@ |
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version https://git-lfs.github.com/spec/v1 |
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oid sha256:026bb9372882d8fc15540b4f94e23138e75aacb0ebf2f5940b056fc66819ec46 |
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size 1968862 |
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