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@@ -121,7 +121,7 @@ namespace Emby.Drawing.Common
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/// </summary>
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/// <param name="binaryReader">The binary reader.</param>
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/// <returns>System.Int16.</returns>
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- private static short ReadLittleEndianInt16(BinaryReader binaryReader)
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+ private static short ReadLittleEndianInt16(this BinaryReader binaryReader)
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{
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var bytes = new byte[sizeof(short)];
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@@ -137,7 +137,7 @@ namespace Emby.Drawing.Common
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/// </summary>
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/// <param name="binaryReader">The binary reader.</param>
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/// <returns>System.Int32.</returns>
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- private static int ReadLittleEndianInt32(BinaryReader binaryReader)
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+ private static int ReadLittleEndianInt32(this BinaryReader binaryReader)
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{
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var bytes = new byte[sizeof(int)];
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for (int i = 0; i < sizeof(int); i += 1)
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@@ -205,25 +205,30 @@ namespace Emby.Drawing.Common
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/// <exception cref="System.ArgumentException"></exception>
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private static ImageSize DecodeJfif(BinaryReader binaryReader)
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{
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+ // A JPEG image consists of a sequence of segments,
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+ // each beginning with a marker, each of which begins with a 0xFF byte
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+ // followed by a byte indicating what kind of marker it is.
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+ // Source: https://en.wikipedia.org/wiki/JPEG#Syntax_and_structure
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while (binaryReader.ReadByte() == 0xff)
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{
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byte marker = binaryReader.ReadByte();
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- short chunkLength = ReadLittleEndianInt16(binaryReader);
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- if (marker == 0xc0)
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+ short chunkLength = binaryReader.ReadLittleEndianInt16();
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+ // SOF0: Indicates that this is a baseline DCT-based JPEG,
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+ // and specifies the width, height, number of components, and component subsampling
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+ // SOF2: Indicates that this is a progressive DCT-based JPEG,
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+ // and specifies the width, height, number of components, and component subsampling
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+ if (marker == 0xc0 || marker == 0xc2)
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{
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- binaryReader.ReadByte();
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- int height = ReadLittleEndianInt16(binaryReader);
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- int width = ReadLittleEndianInt16(binaryReader);
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- return new ImageSize
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- {
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- Width = width,
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- Height = height
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- };
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+ // https://help.accusoft.com/ImageGear/v18.2/Windows/ActiveX/IGAX-10-12.html
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+ binaryReader.ReadByte(); // We don't care about the first byte
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+ int height = binaryReader.ReadLittleEndianInt16();
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+ int width = binaryReader.ReadLittleEndianInt16();
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+ return new ImageSize(width, height);
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}
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if (chunkLength < 0)
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{
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- var uchunkLength = (ushort)chunkLength;
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+ ushort uchunkLength = (ushort)chunkLength;
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binaryReader.ReadBytes(uchunkLength - 2);
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}
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else
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