From d58da2a7728580f79203cfa502269c31c463775d Mon Sep 17 00:00:00 2001 From: Luke Pulverenti Date: Wed, 18 Sep 2013 14:49:06 -0400 Subject: moved image manager to an interface --- MediaBrowser.Controller/Drawing/ImageHeader.cs | 227 ------------------------- 1 file changed, 227 deletions(-) delete mode 100644 MediaBrowser.Controller/Drawing/ImageHeader.cs (limited to 'MediaBrowser.Controller/Drawing/ImageHeader.cs') diff --git a/MediaBrowser.Controller/Drawing/ImageHeader.cs b/MediaBrowser.Controller/Drawing/ImageHeader.cs deleted file mode 100644 index 95a753f00..000000000 --- a/MediaBrowser.Controller/Drawing/ImageHeader.cs +++ /dev/null @@ -1,227 +0,0 @@ -using MediaBrowser.Model.Logging; -using System; -using System.Collections.Generic; -using System.Drawing; -using System.IO; -using System.Linq; - -namespace MediaBrowser.Controller.Drawing -{ - /// - /// Taken from http://stackoverflow.com/questions/111345/getting-image-dimensions-without-reading-the-entire-file/111349 - /// http://www.codeproject.com/Articles/35978/Reading-Image-Headers-to-Get-Width-and-Height - /// Minor improvements including supporting unsigned 16-bit integers when decoding Jfif and added logic - /// to load the image using new Bitmap if reading the headers fails - /// - public static class ImageHeader - { - /// - /// The error message - /// - const string ErrorMessage = "Could not recognize image format."; - - /// - /// The image format decoders - /// - private static readonly KeyValuePair>[] ImageFormatDecoders = new Dictionary> - { - { new byte[] { 0x42, 0x4D }, DecodeBitmap }, - { new byte[] { 0x47, 0x49, 0x46, 0x38, 0x37, 0x61 }, DecodeGif }, - { new byte[] { 0x47, 0x49, 0x46, 0x38, 0x39, 0x61 }, DecodeGif }, - { new byte[] { 0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A }, DecodePng }, - { new byte[] { 0xff, 0xd8 }, DecodeJfif } - - }.ToArray(); - - private static readonly int MaxMagicBytesLength = ImageFormatDecoders.Select(i => i.Key.Length).OrderByDescending(i => i).First(); - - /// - /// Gets the dimensions of an image. - /// - /// The path of the image to get the dimensions of. - /// The logger. - /// The dimensions of the specified image. - /// The image was of an unrecognised format. - public static Size GetDimensions(string path, ILogger logger) - { - try - { - using (var fs = File.OpenRead(path)) - { - using (var binaryReader = new BinaryReader(fs)) - { - return GetDimensions(binaryReader); - } - } - } - catch - { - logger.Info("Failed to read image header for {0}. Doing it the slow way.", path); - } - - // Buffer to memory stream to avoid image locking file - using (var fs = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read)) - { - using (var memoryStream = new MemoryStream()) - { - fs.CopyTo(memoryStream); - - // Co it the old fashioned way - using (var b = Image.FromStream(memoryStream, true, false)) - { - return b.Size; - } - } - } - } - - /// - /// Gets the dimensions of an image. - /// - /// The binary reader. - /// Size. - /// binaryReader - /// The image was of an unrecognized format. - private static Size GetDimensions(BinaryReader binaryReader) - { - var magicBytes = new byte[MaxMagicBytesLength]; - - for (var i = 0; i < MaxMagicBytesLength; i += 1) - { - magicBytes[i] = binaryReader.ReadByte(); - - foreach (var kvPair in ImageFormatDecoders) - { - if (StartsWith(magicBytes, kvPair.Key)) - { - return kvPair.Value(binaryReader); - } - } - } - - throw new ArgumentException(ErrorMessage, "binaryReader"); - } - - /// - /// Startses the with. - /// - /// The this bytes. - /// The that bytes. - /// true if XXXX, false otherwise - private static bool StartsWith(byte[] thisBytes, byte[] thatBytes) - { - for (int i = 0; i < thatBytes.Length; i += 1) - { - if (thisBytes[i] != thatBytes[i]) - { - return false; - } - } - - return true; - } - - /// - /// Reads the little endian int16. - /// - /// The binary reader. - /// System.Int16. - private static short ReadLittleEndianInt16(BinaryReader binaryReader) - { - var bytes = new byte[sizeof(short)]; - - for (int i = 0; i < sizeof(short); i += 1) - { - bytes[sizeof(short) - 1 - i] = binaryReader.ReadByte(); - } - return BitConverter.ToInt16(bytes, 0); - } - - /// - /// Reads the little endian int32. - /// - /// The binary reader. - /// System.Int32. - private static int ReadLittleEndianInt32(BinaryReader binaryReader) - { - var bytes = new byte[sizeof(int)]; - for (int i = 0; i < sizeof(int); i += 1) - { - bytes[sizeof(int) - 1 - i] = binaryReader.ReadByte(); - } - return BitConverter.ToInt32(bytes, 0); - } - - /// - /// Decodes the bitmap. - /// - /// The binary reader. - /// Size. - private static Size DecodeBitmap(BinaryReader binaryReader) - { - binaryReader.ReadBytes(16); - int width = binaryReader.ReadInt32(); - int height = binaryReader.ReadInt32(); - return new Size(width, height); - } - - /// - /// Decodes the GIF. - /// - /// The binary reader. - /// Size. - private static Size DecodeGif(BinaryReader binaryReader) - { - int width = binaryReader.ReadInt16(); - int height = binaryReader.ReadInt16(); - return new Size(width, height); - } - - /// - /// Decodes the PNG. - /// - /// The binary reader. - /// Size. - private static Size DecodePng(BinaryReader binaryReader) - { - binaryReader.ReadBytes(8); - int width = ReadLittleEndianInt32(binaryReader); - int height = ReadLittleEndianInt32(binaryReader); - return new Size(width, height); - } - - /// - /// Decodes the jfif. - /// - /// The binary reader. - /// Size. - /// - private static Size DecodeJfif(BinaryReader binaryReader) - { - while (binaryReader.ReadByte() == 0xff) - { - byte marker = binaryReader.ReadByte(); - short chunkLength = ReadLittleEndianInt16(binaryReader); - if (marker == 0xc0) - { - binaryReader.ReadByte(); - int height = ReadLittleEndianInt16(binaryReader); - int width = ReadLittleEndianInt16(binaryReader); - return new Size(width, height); - } - - if (chunkLength < 0) - { - var uchunkLength = (ushort)chunkLength; - binaryReader.ReadBytes(uchunkLength - 2); - } - else - { - binaryReader.ReadBytes(chunkLength - 2); - } - } - - throw new ArgumentException(ErrorMessage); - } - } -} -- cgit v1.2.3